:root {
  color-scheme: light dark;
  --font-sans: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "IBM Plex Mono", Menlo, Consolas, monospace;

  --paper: #F4F5F6;
  --raised: #FFFFFF;
  --hover: #FAFBFC;
  --ink: #111418;
  --muted: #4A515C;
  --muted-dim: #646A76;
  --line: #E1E3E8;
  --line-strong: #B9BFCB;
  --nav-bg: rgba(244, 245, 246, .85);
  --code-bg: #E9EBEF;

  --panel: #111418;
  --panel-raised: #14181F;
  --panel-line: #262C36;
  --panel-line-strong: #3B4350;
  --panel-ink: #EEF0F4;
  --panel-muted: #AAB1BE;

  --accent: #0B5FCE;
  --accent-deep: #094FAE;
  --accent-ink: #FFFFFF;
  --ok: #17683A;
  --warn: #8A5B00;
  --danger: #A81E1E;
  --ok-soft: #E7F2EC;
  --warn-soft: #FBF1DE;
  --danger-soft: #FBEAEA;

  --t-hero: clamp(2.6rem, 6vw, 4.5rem);
  --t-display: clamp(2.1rem, 4.4vw, 3.3rem);
  --t-section: clamp(1.9rem, 3.4vw, 2.75rem);
  --t-subhead: 1.5rem;
  --t-heading: 1.3125rem;
  --t-body: 1.0625rem;
  --t-small: .9375rem;
  --t-meta: .8125rem;
  --t-micro: .75rem;

  --w-display: 700;
  --w-heading: 650;
  --w-strong: 600;
  --w-medium: 550;

  --track-hero: -.024em;
  --track-display: -.022em;
  --track-section: -.02em;
  --track-subhead: -.018em;
  --track-heading: -.015em;
  --track-body: -.011em;
  --track-small: -.006em;
  --track-caps: .04em;

  --lh-prose: 1.6;
  --lh-ui: 1.42;
  --lh-tight: 1.2;

  --s-1: .25rem;
  --s-2: .5rem;
  --s-3: .75rem;
  --s-4: 1rem;
  --s-5: 1.5rem;
  --s-6: 2.5rem;
  --s-7: 4rem;
  --s-8: 6rem;

  --ring: 0 0 0 1px rgba(16, 20, 28, .07);
  --ring-strong: 0 0 0 1px rgba(16, 20, 28, .12);
  --e-1: 0 1px 2px rgba(16, 20, 28, .05), 0 1px 1px rgba(16, 20, 28, .03);
  --e-2: 0 2px 4px rgba(16, 20, 28, .04), 0 8px 18px -6px rgba(16, 20, 28, .10);
  --e-3: 0 4px 8px rgba(16, 20, 28, .05), 0 18px 36px -10px rgba(16, 20, 28, .16);
  --e-4: 0 8px 16px rgba(16, 20, 28, .07), 0 32px 64px -16px rgba(16, 20, 28, .24);

  --tint: color-mix(in oklab, var(--accent) 7%, var(--raised));
  --tint-strong: color-mix(in oklab, var(--accent) 13%, var(--raised));
  --scrim: rgba(16, 20, 28, .34);

  --ease: cubic-bezier(.32, .72, 0, 1);
  --ease-out: cubic-bezier(.22, .78, .28, 1);
  --ease-spring: cubic-bezier(.34, 1.42, .48, 1);
  --dur-fast: 130ms;
  --dur: 280ms;
  --dur-slow: 460ms;

  --code-comment: #8b949e;
  --code-keyword: #ff7b72;
  --code-string: #a5d6ff;
  --code-number: #79c0ff;
  --code-func: #d2a8ff;
  --code-name: #ffa657;
  --code-added: #56d364;
  --code-removed: #f85149;

  --r-control: 10px;
  --r-container: 16px;
  --r-pill: 999px;
  --r-sheet: 22px;
  --r: var(--r-container);
  --tap: 44px;
  --bar: 52px;
  --nav-h: 60px;

  --maxw: 1140px;
  --pad: clamp(1.15rem, 4vw, 2.4rem);
}

@media screen and (prefers-color-scheme: dark) {
  :root {
    --paper: #0E1116;
    --raised: #161A21;
    --hover: #1C212A;
    --ink: #ECEEF2;
    --muted: #A2AAB8;
    --muted-dim: #878F9D;
    --line: rgba(255, 255, 255, .11);
    --line-strong: rgba(255, 255, 255, .22);
    --nav-bg: rgba(14, 17, 22, .85);
    --code-bg: #222833;

    --panel: #1A1F27;
    --panel-raised: #20262F;
    --panel-line: rgba(255, 255, 255, .12);
    --panel-line-strong: rgba(255, 255, 255, .24);
    --panel-ink: #F3F5F8;
    --panel-muted: #A9B1BE;

    --accent: #5AA4FF;
    --accent-deep: #7FB8FF;
    --accent-ink: #0A1020;
    --ok: #5FD08D;
    --warn: #E3B341;
    --danger: #F87171;
    --ok-soft: rgba(95, 208, 141, .14);
    --warn-soft: rgba(227, 179, 65, .14);
    --danger-soft: rgba(248, 113, 113, .14);

    --ring: 0 0 0 1px rgba(255, 255, 255, .08);
    --ring-strong: 0 0 0 1px rgba(255, 255, 255, .16);
    --e-1: 0 1px 2px rgba(0, 0, 0, .34);
    --e-2: 0 2px 4px rgba(0, 0, 0, .32), 0 8px 18px -6px rgba(0, 0, 0, .46);
    --e-3: 0 4px 8px rgba(0, 0, 0, .34), 0 18px 36px -10px rgba(0, 0, 0, .58);
    --e-4: 0 8px 16px rgba(0, 0, 0, .40), 0 32px 64px -16px rgba(0, 0, 0, .70);

    --tint: color-mix(in oklab, var(--accent) 15%, var(--raised));
    --tint-strong: color-mix(in oklab, var(--accent) 24%, var(--raised));
    --scrim: rgba(0, 0, 0, .58);
  }
}

* { box-sizing: border-box; margin: 0; padding: 0 }

/* A display rule on a class outranks the user agent's [hidden], so anything
   given display by this sheet ignores the attribute unless we insist. */
[hidden] { display: none !important }

html { scrollbar-color: color-mix(in oklab, var(--ink) 28%, transparent) transparent }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--t-body);
  line-height: var(--lh-ui);
  letter-spacing: var(--track-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-optical-sizing: auto;
}
button, input, select, textarea { font-family: inherit }

.post, .prose, .lead, blockquote, .empty p, .notice p, .callout { line-height: var(--lh-prose) }

body:not(.console) { min-height: 100svh; display: flex; flex-direction: column }
body:not(.console) > main { flex: 1 0 auto }

a { color: inherit; text-decoration: none }
h1, h2, h3 { font-family: var(--font-sans); font-weight: var(--w-heading); line-height: var(--lh-tight); letter-spacing: var(--track-heading); text-wrap: balance }
h1 { line-height: 1.07; font-weight: var(--w-display) }
h2 { line-height: 1.12 }
h3 { font-weight: var(--w-strong) }
img { max-width: 100% }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums }
.tabular { font-variant-numeric: tabular-nums }
.icon { width: 1em; height: 1em; flex: none; fill: none; stroke: currentColor; stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round }
.btn .icon { width: 1rem; height: 1rem }
.wrap { max-width: var(--maxw); margin-inline: auto; padding-inline: var(--pad) }
.wrap-reading { max-width: calc(68ch + 2 * var(--pad)) }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px }
.label { font-size: var(--t-small); color: var(--muted); margin-bottom: var(--s-3) }
.eyebrow { font-size: var(--t-small); font-weight: var(--w-strong); letter-spacing: var(--track-small); color: var(--muted) }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap }

.stack-4 { margin-top: var(--s-4) }
.stack-5 { margin-top: var(--s-5) }
.stack-6 { margin-top: var(--s-6) }
body:not(.console) section.tight { padding-top: 0 }
.subhead { font-size: var(--t-subhead); letter-spacing: var(--track-subhead); margin-bottom: var(--s-4) }
.subhead-spaced { font-size: var(--t-subhead); letter-spacing: var(--track-subhead); margin: var(--s-6) 0 var(--s-4) }

.skip-link { position: absolute; left: -999px; top: 0; background: var(--accent); color: var(--accent-ink); padding: .6rem 1rem; z-index: 100 }
.skip-link:focus { left: 0 }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--s-2);
  min-height: var(--tap);
  font-family: var(--font-sans); font-weight: 550; font-size: var(--t-small);
  letter-spacing: -.005em;
  padding: .72rem 1.45rem; border-radius: var(--r-pill); border: 0;
  cursor: pointer; -webkit-tap-highlight-color: transparent;
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
              color var(--dur) var(--ease), transform var(--dur-fast) var(--ease-out);
}
.btn:active { transform: scale(.968) }
.btn-primary { background: var(--accent); color: var(--accent-ink); box-shadow: var(--e-1) }
.btn-primary:hover { background: var(--accent-deep); box-shadow: var(--e-2) }
.btn-primary:active { box-shadow: var(--e-1) }
.btn-ghost { background: transparent; box-shadow: inset 0 0 0 1px var(--line-strong); color: var(--ink) }
.btn-ghost:hover { background: var(--hover); box-shadow: inset 0 0 0 1px var(--ink) }
.btn-ghost-dark { background: transparent; box-shadow: inset 0 0 0 1px var(--panel-line-strong); color: var(--panel-ink) }
.btn-ghost-dark:hover { background: rgba(255, 255, 255, .06); box-shadow: inset 0 0 0 1px var(--panel-muted) }
.btn[disabled] { opacity: .45; cursor: not-allowed; box-shadow: none }
.btn[disabled]:active { transform: none }
.textlink { color: var(--accent); font-weight: 500 }
.textlink:hover { text-decoration: underline; text-underline-offset: 3px }
.quietlink { color: var(--muted); font-weight: 500; text-decoration: underline; text-underline-offset: 3px }
.quietlink:hover { color: var(--ink) }
.hero-actions .quietlink, .buybox .quietlink { display: inline-flex; align-items: center; justify-content: center; min-height: var(--tap) }

.preview-bar {
  display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: .3rem var(--s-4);
  padding: .5rem var(--s-4); background: var(--ink); color: var(--paper);
  font-size: var(--t-small); text-align: center;
}
.preview-bar a { color: inherit; font-weight: 600; text-decoration: underline; text-underline-offset: .2em }
fieldset.inert { display: contents; border: 0; margin: 0; padding: 0; min-inline-size: 0 }
fieldset.inert :is(button, input) { opacity: .55; cursor: not-allowed }

header.nav {
  position: sticky; top: 0; z-index: 40;
  background: var(--nav-bg);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
header.nav.scrolled { border-bottom-color: var(--line); box-shadow: 0 1px 12px -6px rgba(16, 20, 28, .18) }
.nav-inner { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: var(--s-4); height: var(--nav-h) }
.brand { display: flex; align-items: center; gap: .55rem; min-height: var(--tap); font-weight: var(--w-display); font-size: 1.08rem; letter-spacing: var(--track-heading); justify-self: start; white-space: nowrap }
.mark {
  width: 1.15rem; height: 1.15rem; flex: none; background: currentColor;
  -webkit-mask: url("/static/img/mark.d647a286020f.png") center / contain no-repeat;
  mask: url("/static/img/mark.d647a286020f.png") center / contain no-repeat;
}
.nav-links { display: flex; align-items: center }
.nav-primary { display: flex; gap: .1rem; align-items: center }
.nav-primary a, .nav-learning {
  font-size: var(--t-small); letter-spacing: var(--track-small); color: var(--muted);
  padding: .4rem .72rem; border-radius: var(--r-pill);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur-fast) var(--ease-out);
}
.nav-primary a:hover, .nav-learning:hover { color: var(--ink) }
.nav-primary a:active, .nav-learning:active { transform: scale(.96) }
.nav-primary a[aria-current="page"], .nav-learning[aria-current="page"] { color: var(--ink); font-weight: var(--w-strong) }
.nav-sheet-account { display: none }
.nav-end { display: flex; align-items: center; gap: var(--s-2); justify-self: end }
.nav-cta {
  font-size: var(--t-small); font-weight: var(--w-medium); color: var(--accent-ink); background: var(--accent);
  padding: .42rem 1rem; border-radius: var(--r-pill);
  transition: background var(--dur) var(--ease), transform var(--dur-fast) var(--ease-out);
}
.nav-cta:hover { background: var(--accent-deep) }
.nav-cta:active { transform: scale(.96) }
.inline-form { display: inline }

.avatar {
  display: inline-flex; align-items: center; justify-content: center; flex: none;
  width: 2rem; height: 2rem; border-radius: 50%;
  font-size: .78rem; font-weight: var(--w-strong); letter-spacing: .01em; color: var(--accent-ink);
  background: linear-gradient(160deg, var(--accent), var(--accent-deep));
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .18);
}
.account-menu { position: relative }
.avatar-button {
  list-style: none; cursor: pointer; display: flex; border-radius: 50%;
  padding: 3px; -webkit-tap-highlight-color: transparent;
  transition: box-shadow var(--dur) var(--ease), transform var(--dur-fast) var(--ease-out);
}
.avatar-button::-webkit-details-marker { display: none }
.avatar-button:hover { box-shadow: 0 0 0 3px var(--tint-strong) }
.avatar-button:active { transform: scale(.94) }
.account-menu[open] .avatar-button { box-shadow: 0 0 0 3px var(--tint-strong) }
.menu {
  position: absolute; right: 0; top: calc(100% + .55rem); z-index: 50;
  width: 16.5rem; padding: .4rem;
  background: var(--raised); border-radius: 14px; box-shadow: var(--ring), var(--e-4);
  transform-origin: top right; animation: menu-in var(--dur) var(--ease);
}
@keyframes menu-in { from { opacity: 0; transform: scale(.96) translateY(-4px) } }
.menu-head { display: flex; flex-direction: column; gap: .1rem; padding: .6rem .7rem .7rem; margin-bottom: .3rem; border-bottom: 1px solid var(--line) }
.menu-head b, .nav-sheet-name b { font-weight: var(--w-strong); font-size: var(--t-small); overflow: hidden; text-overflow: ellipsis; white-space: nowrap }
.menu-head span, .nav-sheet-name span { font-size: var(--t-meta); color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap }
.menu-list { list-style: none; display: flex; flex-direction: column }
.menu-list a, .menu-list button {
  display: flex; align-items: center; gap: .7rem; width: 100%; min-height: 2.5rem; padding: .45rem .7rem;
  border: 0; border-radius: 9px; background: none; color: var(--ink); cursor: pointer; text-align: left;
  font: inherit; font-size: var(--t-small); letter-spacing: var(--track-small);
  transition: background var(--dur-fast) var(--ease);
}
.menu-list .icon { width: 1rem; height: 1rem; color: var(--muted) }
.menu-list a:hover, .menu-list button:hover { background: var(--hover) }
.menu-list a:active, .menu-list button:active { background: var(--tint) }
.menu-list a[aria-current="page"] { color: var(--accent); font-weight: var(--w-medium) }
.menu-list a[aria-current="page"] .icon { color: var(--accent) }
.menu-sep { height: 1px; background: var(--line); margin: .3rem .5rem }

.nav-toggle {
  display: none; position: relative; width: var(--tap); height: var(--tap); flex: none;
  border: 0; padding: 0; background: none; cursor: pointer;
  border-radius: 50%; -webkit-tap-highlight-color: transparent;
}
header.nav .nav-toggle { margin-right: -.6rem }
.nav-toggle span:nth-child(2):not(:last-child) { transition: opacity var(--dur-fast) var(--ease) }
.nav-toggle[aria-expanded="true"] span:nth-child(2):not(:last-child) { opacity: 0 }
.nav-toggle span {
  position: absolute; left: 50%; top: 50%; width: 17px; height: 1.5px; margin-left: -8.5px; border-radius: 1px;
  background: var(--ink); transition: transform var(--dur) var(--ease);
}
.nav-toggle span:first-child { transform: translateY(-3.5px) }
.nav-toggle span:last-child { transform: translateY(3.5px) }
.nav-toggle[aria-expanded="true"] span:first-child, .nav-close span:first-child { transform: rotate(45deg) }
.nav-toggle[aria-expanded="true"] span:last-child, .nav-close span:last-child { transform: rotate(-45deg) }

.hero { padding-top: clamp(2rem, 4.5vw, 3.5rem) }
body:not(.console) main:has(> .hero) > section { padding-block: clamp(1.75rem, 3.5vw, 3rem) }
body:not(.console) main:has(> .hero) > .hero + section { padding-top: clamp(2.5rem, 5vw, 4rem) }
.hero-copy { display: flex; flex-direction: column; align-items: center; text-align: center; max-width: 52rem; margin-inline: auto }
.hero h1 { font-size: var(--t-hero); letter-spacing: var(--track-hero); margin-bottom: var(--s-5) }
.hero h1 .b { color: var(--accent) }
.hero p.lead { font-size: clamp(1.1rem, 1.6vw, 1.3rem); line-height: 1.5; letter-spacing: var(--track-body); color: var(--muted); max-width: 40ch; margin-bottom: var(--s-6); text-wrap: pretty }
.hero-actions { display: flex; gap: var(--s-5); align-items: center; flex-wrap: wrap }
.hero-copy .hero-actions { justify-content: center }
.hero-eyebrow { display: block; margin-bottom: var(--s-4) }
.hero-shot {
  position: relative; overflow: hidden; margin-top: clamp(2.5rem, 6vw, 4.5rem);
  border-radius: var(--r-sheet); box-shadow: var(--ring), var(--e-3); background: var(--panel);
}
.hero-shot img { display: block; width: 100%; aspect-ratio: 21 / 9; height: auto; object-fit: cover }

.btn-large { min-height: 3rem; padding: .8rem 1.7rem; font-size: var(--t-body) }
.more { display: inline-flex; align-items: center; gap: .3rem; min-height: var(--tap); color: var(--accent); font-weight: var(--w-medium); letter-spacing: var(--track-small); white-space: nowrap }
.more::after {
  content: ""; width: .42rem; height: .42rem; flex: none; margin-left: .1rem;
  border-top: 1.6px solid currentColor; border-right: 1.6px solid currentColor;
  transform: rotate(45deg); transition: transform var(--dur) var(--ease);
}
.more:hover { text-decoration: underline; text-underline-offset: 3px }
.more:hover::after { transform: translateX(2px) rotate(45deg) }

body:not(.console) section { padding-block: clamp(3.5rem, 7vw, 5.5rem) }
.sec-head { max-width: 56ch; margin-bottom: clamp(1.8rem, 3.5vw, 2.6rem) }
.sec-head-row { max-width: none; display: flex; justify-content: space-between; align-items: flex-end; gap: var(--s-5) }
.sec-head-row > div { max-width: 56ch }
.sec-head .eyebrow, .prose .eyebrow { display: block; margin-bottom: var(--s-3) }
.sec-head h2, .section-heading { font-size: var(--t-section); margin-bottom: var(--s-3); letter-spacing: var(--track-section) }
.sec-head p { color: var(--muted); font-size: var(--t-body); text-wrap: pretty }

.path { list-style: none; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: var(--s-3); counter-reset: path }
.path-step {
  display: flex; flex-direction: column; gap: .35rem; padding: 1.25rem 1.25rem 1.4rem;
  background: var(--raised); border-radius: var(--r-container); box-shadow: var(--ring), var(--e-1);
}
.path-step b { font-size: var(--t-body); font-weight: var(--w-strong); letter-spacing: var(--track-heading); margin-top: var(--s-3) }
.path-step span:last-child { font-size: var(--t-small); color: var(--muted); text-wrap: pretty }
.path-num { font-size: var(--t-meta); font-weight: var(--w-strong); color: var(--accent); font-variant-numeric: tabular-nums }
.path-step:last-child { background: var(--tint); box-shadow: inset 0 0 0 1px color-mix(in oklab, var(--accent) 30%, transparent) }

.feature {
  background: var(--panel); color: var(--panel-ink); border-radius: var(--r-sheet);
  padding: clamp(1.8rem, 4.5vw, 3.5rem); display: grid; grid-template-columns: 1.1fr .9fr;
  gap: clamp(1.8rem, 4vw, 3.5rem); align-items: center; box-shadow: var(--e-2);
}
.feature .eyebrow { color: var(--panel-muted) }
.feature h3 { font-size: clamp(1.7rem, 3.2vw, 2.4rem); font-weight: var(--w-heading); letter-spacing: var(--track-section); color: var(--panel-ink); margin: var(--s-2) 0 var(--s-4) }
.feature p { color: var(--panel-muted); margin-bottom: var(--s-5); max-width: 46ch }
.feature-facts { display: flex; flex-wrap: wrap; gap: var(--s-3) var(--s-6); margin-bottom: var(--s-6) }
.feature-facts dt { font-size: var(--t-meta); color: var(--panel-muted) }
.feature-facts dd { font-size: var(--t-small); font-weight: var(--w-medium); color: var(--panel-ink); font-variant-numeric: tabular-nums }
.targets { background: rgba(255, 255, 255, .04); border-radius: var(--r-container); padding: 1.1rem 1.3rem; box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .08) }
.targets-head { display: block; font-size: var(--t-meta); color: var(--panel-muted); margin-bottom: var(--s-2) }
.targets ul { list-style: none }
.targets li {
  display: flex; align-items: center; gap: .7rem; padding: .6rem 0; font-size: var(--t-small); color: var(--panel-ink);
  border-bottom: 1px solid rgba(255, 255, 255, .08);
}
.targets li:last-child { border-bottom: 0; padding-bottom: 0 }
.targets li::before {
  content: ""; width: .55rem; height: .3rem; flex: none; margin-top: -.15rem;
  border-left: 1.6px solid #7FB8FF; border-bottom: 1.6px solid #7FB8FF; transform: rotate(-45deg);
}
.feature .card-art.feature-art { margin: 0; border-radius: var(--r-container) }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: var(--s-5) }
.card {
  background: var(--raised); border: 0; border-radius: var(--r-container);
  padding: 0 var(--s-5) var(--s-5); display: flex; flex-direction: column;
  box-shadow: var(--ring), var(--e-1);
  transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.card:hover { box-shadow: var(--ring), var(--e-3); transform: translateY(-3px) }
.card:active { transform: translateY(-1px) scale(.994); transition-duration: var(--dur-fast) }

[data-art="0"] { --art-h: 212 }
[data-art="1"] { --art-h: 258 }
[data-art="2"] { --art-h: 288 }
[data-art="3"] { --art-h: 328 }
[data-art="4"] { --art-h: 12 }
[data-art="5"] { --art-h: 32 }
[data-art="6"] { --art-h: 178 }
[data-art="7"] { --art-h: 152 }

.card-art {
  aspect-ratio: 16 / 9; margin: 0 calc(-1 * var(--s-5)) var(--s-5);
  border-radius: var(--r-container) var(--r-container) 0 0;
  overflow: hidden; position: relative; isolation: isolate;
  background:
    radial-gradient(104% 124% at 16% 4%, hsl(var(--art-h) 48% 44%) 0%, transparent 64%),
    radial-gradient(88% 112% at 94% 98%, hsl(calc(var(--art-h) + 44) 42% 26%) 0%, transparent 60%),
    linear-gradient(152deg, hsl(calc(var(--art-h) + 12) 34% 22%), hsl(calc(var(--art-h) - 18) 40% 13%));
}
.card-art::after {
  content: ""; position: absolute; inset: 0;
  background:
    repeating-linear-gradient(90deg, rgba(255, 255, 255, .05) 0 1px, transparent 1px 42px),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, .05) 0 1px, transparent 1px 42px),
    linear-gradient(180deg, rgba(255, 255, 255, .1), transparent 38%, rgba(0, 0, 0, .3));
}
.card-art img { width: 100%; height: 100%; object-fit: cover; display: block; position: relative; z-index: 1 }
.card-art:has(img)::after { background: linear-gradient(180deg, transparent 62%, rgba(0, 0, 0, .22)); z-index: 1 }
.card-art:not([data-art]) {
  background:
    radial-gradient(104% 124% at 16% 4%, hsl(212 48% 44%) 0%, transparent 64%),
    linear-gradient(152deg, hsl(224 34% 22%), hsl(194 40% 13%));
}
.card-art-post::before {
  content: ""; position: absolute; z-index: 2; inset: auto 0 0 0; height: 3px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, .5), transparent);
}

.card-art-play::before {
  content: ""; position: absolute; z-index: 2; inset: 0; margin: auto;
  width: 3.4rem; height: 3.4rem; border-radius: 50%;
  background: rgba(255, 255, 255, .18) center / .95rem no-repeat
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath fill='%23fff' d='M4.5 2.6v10.8L14 8z'/%3E%3C/svg%3E");
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .32);
  transition: transform var(--dur) var(--ease-spring), background var(--dur) var(--ease);
}
.card:hover .card-art-play::before { transform: scale(1.09); background-color: rgba(255, 255, 255, .3) }

.course-banner {
  height: clamp(9rem, 20vw, 15rem); margin-top: var(--s-5);
  border-radius: var(--r-sheet); overflow: hidden; position: relative;
  box-shadow: var(--ring), var(--e-2);
  background:
    radial-gradient(72% 150% at 12% 0%, hsl(var(--art-h) 48% 44%) 0%, transparent 62%),
    radial-gradient(62% 140% at 96% 100%, hsl(calc(var(--art-h) + 44) 42% 26%) 0%, transparent 58%),
    linear-gradient(118deg, hsl(calc(var(--art-h) + 12) 34% 22%), hsl(calc(var(--art-h) - 18) 40% 13%));
}
.course-banner img { width: 100%; height: 100%; object-fit: cover; display: block; position: relative; z-index: 1 }
.course-banner:has(img)::after { background: linear-gradient(180deg, transparent 66%, rgba(0, 0, 0, .2)); z-index: 1 }
.course-banner:not([data-art]) {
  background:
    radial-gradient(72% 150% at 12% 0%, hsl(212 48% 44%) 0%, transparent 62%),
    linear-gradient(118deg, hsl(224 34% 22%), hsl(194 40% 13%));
}
.course-banner::after {
  content: ""; position: absolute; inset: 0;
  background:
    repeating-linear-gradient(90deg, rgba(255, 255, 255, .05) 0 1px, transparent 1px 56px),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, .05) 0 1px, transparent 1px 56px),
    linear-gradient(180deg, rgba(255, 255, 255, .08), transparent 44%, rgba(0, 0, 0, .28));
}

.card-art-book::before {
  content: ""; position: absolute; z-index: 2; inset: 0 auto 0 1.6rem; width: 3px;
  background: linear-gradient(180deg, transparent, rgba(255, 255, 255, .45), transparent);
}

.card > .track:first-child { padding-top: var(--s-5) }
.card .track { font-size: var(--t-meta); font-weight: var(--w-strong); color: var(--accent); margin-bottom: var(--s-1) }
.card h3 { font-size: var(--t-subhead); margin-bottom: .5rem; letter-spacing: var(--track-subhead); overflow-wrap: anywhere }
.card p { font-size: var(--t-small); color: var(--muted); line-height: var(--lh-prose); margin-bottom: var(--s-5); flex: 1 }
.card .up-next { color: var(--ink) }
.card .up-next .eyebrow { display: block; margin-bottom: var(--s-1) }
.card .foot { display: flex; justify-content: space-between; align-items: center; gap: var(--s-3); min-height: 2rem; font-size: var(--t-small); color: var(--muted); font-variant-numeric: tabular-nums }
.card .foot .card-price { color: var(--ink); font-weight: var(--w-strong) }
.card .foot .open { display: inline-flex; align-items: center; gap: .3rem; color: var(--accent); font-weight: var(--w-medium); white-space: nowrap }
.card .foot .open::after {
  content: ""; width: .4rem; height: .4rem; border-top: 1.6px solid currentColor; border-right: 1.6px solid currentColor;
  transform: rotate(45deg); transition: transform var(--dur) var(--ease);
}
.card:hover .foot .open::after { transform: translateX(2px) rotate(45deg) }
.go {
  position: relative; flex: none; width: 1.9rem; height: 1.9rem; margin-left: auto; border-radius: 50%;
  background: var(--tint); color: var(--accent);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.go::after {
  content: ""; position: absolute; left: 50%; top: 50%; width: .42rem; height: .42rem; margin: -.21rem 0 0 -.3rem;
  border-top: 1.7px solid currentColor; border-right: 1.7px solid currentColor; transform: rotate(45deg);
}
.card:hover .go { background: var(--accent); color: var(--accent-ink); transform: translateX(2px) }

.free-courses { display: flex; flex-direction: column; gap: var(--s-5) }
.free-course {
  display: grid; grid-template-columns: minmax(0, 17rem) minmax(0, 1fr); gap: var(--s-5); align-items: start;
  padding: var(--s-5); background: var(--raised); border-radius: var(--r-container);
  box-shadow: var(--ring), var(--e-1);
}
.free-course .card-art { display: block; margin: 0; border-radius: var(--r-control) }
.free-course-body { display: flex; flex-direction: column; min-width: 0 }
.free-course h2 { font-size: var(--t-subhead); letter-spacing: var(--track-subhead); margin-bottom: var(--s-1); overflow-wrap: anywhere }
.free-course h2 a:hover { color: var(--accent) }
.free-course-body > p { font-size: var(--t-small); color: var(--muted); line-height: var(--lh-prose) }
.free-lessons { list-style: none; margin-top: var(--s-4); border-top: 1px solid var(--line) }
.free-lessons li { border-bottom: 1px solid var(--line) }
.free-lessons a {
  display: flex; align-items: center; gap: var(--s-3); min-height: var(--tap);
  padding: .55rem var(--s-2); font-size: var(--t-small); font-weight: var(--w-medium);
  transition: background var(--dur-fast) var(--ease);
}
.free-lessons a::before {
  content: ""; flex: none; width: .8rem; height: .8rem; background: var(--accent);
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4.5 2.6v10.8L14 8z'/%3E%3C/svg%3E") center / contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4.5 2.6v10.8L14 8z'/%3E%3C/svg%3E") center / contain no-repeat;
}
.free-lessons a:hover { background: var(--hover) }
.free-lesson-name { flex: 1; min-width: 0; overflow-wrap: anywhere }
.free-lesson-meta { flex: none; color: var(--muted); font-weight: 400; font-variant-numeric: tabular-nums; white-space: nowrap }
.free-course .more { align-self: flex-end; margin-top: var(--s-2) }
@media (max-width: 720px) {
  .free-course { grid-template-columns: minmax(0, 1fr) }
}

.price-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-5); max-width: 800px }
.price-grid-single { grid-template-columns: 1fr }
.price-grid:has(> :only-child) { grid-template-columns: minmax(0, 26rem); justify-content: center }
.price-grid-three { grid-template-columns: repeat(3, minmax(0, 1fr)); max-width: 1100px }
.price { display: flex; flex-direction: column; background: var(--raised); border: 0; border-radius: var(--r-sheet); padding: 2rem 2rem 2.1rem; box-shadow: var(--ring), var(--e-1) }
.price.primary { background: var(--tint); box-shadow: 0 0 0 1.5px var(--accent), var(--e-3) }
.price .plan { font-weight: var(--w-strong); font-size: var(--t-body); letter-spacing: var(--track-heading) }
.price .note { font-size: var(--t-small); color: var(--muted); margin-top: .2rem }
.price .amt { font-size: 2.75rem; font-weight: var(--w-display); letter-spacing: var(--track-display); line-height: 1.1; margin: var(--s-5) 0 .1rem; font-variant-numeric: tabular-nums; display: flex; align-items: baseline; gap: .35rem; flex-wrap: wrap }
.price .amt small { font-size: var(--t-body); color: var(--muted); font-weight: 500; letter-spacing: var(--track-body) }
.price .amt small.amt-from { font-size: var(--t-small); font-weight: var(--w-medium); align-self: center }
.price ul { list-style: none; margin: 1.4rem 0 1.8rem; display: flex; flex-direction: column; gap: .65rem; flex: 1 }
.price li { font-size: var(--t-small); display: flex; gap: .7rem; align-items: flex-start; color: var(--ink) }
.price li::before {
  content: ""; width: .62rem; height: .34rem; margin-top: .42rem; flex: none;
  border-left: 1.8px solid var(--accent); border-bottom: 1.8px solid var(--accent);
  transform: rotate(-45deg);
}
.price .btn { width: 100% }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 5vw, 4rem); align-items: start }
.prose p { color: var(--muted); margin-bottom: var(--s-4); max-width: 46ch }
.prose b { color: var(--ink); font-weight: 600 }
.quotes { display: flex; flex-direction: column; gap: var(--s-6) }
.quote { padding: 0 0 0 1.4rem; border-left: 2px solid var(--line) }
.quote p {
  font-family: var(--font-sans); font-weight: 500;
  font-size: 1.22rem; color: var(--ink); line-height: 1.42; letter-spacing: var(--track-heading);
  text-wrap: pretty;
}
.quote p::before { content: "\201C" }
.quote p::after { content: "\201D" }
.quote cite { font-size: var(--t-small); color: var(--muted); font-style: normal; display: block; margin-top: var(--s-3) }
.quote cite::before { content: "\2014\A0" }

.quiz-item a, .quiz-item .locked { background: var(--tint) }
.quiz-item a:hover { background: var(--tint-strong) }
.curriculum-rail .quiz-item a, .curriculum-rail .quiz-item .locked { background: none }
.quiz-standing { color: var(--muted); font-size: var(--t-small); margin: calc(-1 * var(--s-4)) 0 var(--s-5) }
.quiz .eyebrow { margin-bottom: var(--s-2) }
.quiz-form, .review { display: flex; flex-direction: column; gap: var(--s-4); list-style: none }
.question { border: 0; padding: clamp(1.1rem, 2.4vw, 1.6rem); margin: 0; background: var(--raised); border-radius: var(--r-container); box-shadow: var(--ring), var(--e-1) }
.question legend, .question-prompt { float: left; width: 100%; display: flex; gap: var(--s-3); align-items: baseline; font-size: var(--t-body); font-weight: 600; margin-bottom: var(--s-4); padding: 0; text-wrap: pretty }
.question-num { flex: none; width: 1.75rem; height: 1.75rem; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center; background: var(--tint); color: var(--accent); font-size: var(--t-meta); font-weight: 650; align-self: flex-start }
.choices { clear: both; display: flex; flex-direction: column; gap: var(--s-2) }
.choice {
  display: flex; gap: var(--s-3); align-items: flex-start; padding: .7rem .9rem; min-height: var(--tap);
  border-radius: var(--r-control); background: var(--paper); box-shadow: inset 0 0 0 1px var(--line);
  font-size: var(--t-small); cursor: pointer; transition: box-shadow var(--dur) var(--ease), background var(--dur) var(--ease);
}
.choice:hover { box-shadow: inset 0 0 0 1px var(--line-strong) }
.choice:has(input:checked) { background: var(--tint); box-shadow: inset 0 0 0 1.5px var(--accent) }
.choice:has(input:focus-visible) { box-shadow: inset 0 0 0 1.5px var(--accent), 0 0 0 4px color-mix(in oklab, var(--accent) 18%, transparent) }
.choice input { accent-color: var(--accent); margin-top: .2rem; flex: none }
.choice span:first-of-type { flex: 1 }
.choice-right { background: var(--ok-soft); box-shadow: inset 0 0 0 1.5px var(--ok); cursor: default }
.choice-wrong { background: var(--danger-soft); box-shadow: inset 0 0 0 1.5px var(--danger); cursor: default }
.choice-muted { cursor: default; color: var(--muted) }
.question .choice.choice-right { background: var(--ok-soft); box-shadow: inset 0 0 0 1.5px var(--ok) }
.question .choice.choice-wrong { background: var(--danger-soft); box-shadow: inset 0 0 0 1.5px var(--danger) }
.choice-note { flex: none; font-size: var(--t-meta); font-weight: var(--w-strong); align-self: center }
.choice-right .choice-note { color: var(--ok) }
.choice-wrong .choice-note { color: var(--danger) }
.explanation { margin-top: var(--s-4); padding-left: 1rem; border-left: 2px solid var(--line-strong); color: var(--muted); font-size: var(--t-small) }
.quiz-actions { display: flex; align-items: center; gap: var(--s-4); flex-wrap: wrap; margin-top: var(--s-2) }
.quiz-verdict { display: flex; gap: var(--s-5); align-items: center; padding: clamp(1.2rem, 3vw, 1.8rem); border-radius: var(--r-container); background: var(--danger-soft); box-shadow: inset 0 0 0 1px color-mix(in oklab, var(--danger) 30%, transparent); margin-bottom: var(--s-5) }
.quiz-verdict h2 { font-size: var(--t-subhead); letter-spacing: var(--track-subhead); margin-bottom: .3rem }
.quiz-verdict p { color: var(--muted); font-size: var(--t-small); max-width: 52ch }
.quiz-score { font-family: var(--font-sans); font-size: clamp(2.4rem, 5vw, 3.4rem); font-weight: 600; letter-spacing: var(--track-display); color: var(--danger); flex: none }
.quiz-passed { background: var(--ok-soft); box-shadow: inset 0 0 0 1px color-mix(in oklab, var(--ok) 30%, transparent) }
.quiz-passed .quiz-score { color: var(--ok) }

.certificate-wrap { max-width: 60rem }
.certificate { background: var(--raised); border-radius: var(--r-sheet); box-shadow: var(--ring), var(--e-3); padding: clamp(1.6rem, 4vw, 3rem); position: relative; overflow: hidden }
.certificate::before { content: ""; position: absolute; inset: 0; pointer-events: none; box-shadow: inset 0 0 0 1px var(--line); border-radius: inherit }
.certificate::after { content: ""; position: absolute; inset: 14px; pointer-events: none; border: 1px solid color-mix(in oklab, var(--accent) 35%, transparent); border-radius: calc(var(--r-sheet) - 10px) }
.certificate-head { display: flex; justify-content: space-between; align-items: center; gap: var(--s-4); flex-wrap: wrap; margin-bottom: clamp(2rem, 5vw, 3.5rem) }
.certificate-serial { font-family: var(--font-mono); font-size: var(--t-meta); color: var(--muted); letter-spacing: .04em }
.certificate-body { text-align: center; max-width: 40rem; margin-inline: auto }
.certificate-lead { color: var(--muted); font-size: var(--t-small); margin: var(--s-4) 0 }
.certificate-name { font-size: clamp(2rem, 5vw, 3.4rem); letter-spacing: var(--track-display); margin: 0; text-wrap: balance }
.certificate-course { font-family: var(--font-sans); font-size: clamp(1.4rem, 3vw, 2rem); font-weight: 600; letter-spacing: var(--track-subhead); text-wrap: balance }
.certificate-date { color: var(--muted); font-size: var(--t-small); margin-top: var(--s-4) }
.certificate-foot { display: flex; justify-content: space-between; align-items: flex-end; gap: var(--s-5); flex-wrap: wrap; margin-top: clamp(2rem, 5vw, 3.5rem) }
.certificate-sign { display: flex; flex-direction: column; gap: .2rem }
.certificate-signature { font-size: 1.3rem; font-weight: var(--w-strong); letter-spacing: var(--track-subhead); border-bottom: 1px solid var(--line-strong); padding-bottom: .35rem; min-width: 12rem }
.certificate-role { font-size: var(--t-meta); color: var(--muted) }
.certificate-verify { display: flex; flex-direction: column; gap: .2rem; align-items: flex-end; text-align: right }
.certificate-verify .mono { font-size: var(--t-meta); color: var(--muted); overflow-wrap: anywhere }
.certificate-revoked { opacity: .55; filter: grayscale(1) }
.certificate-actions { display: flex; gap: var(--s-3); flex-wrap: wrap; margin-top: var(--s-5) }
.certificate-record { margin-top: var(--s-6); max-width: 60ch }
.certificate-record p { color: var(--muted); font-size: var(--t-small); margin-bottom: var(--s-3) }
.certificate-record b { color: var(--ink); font-weight: 600 }
@media print {
  :root { color-scheme: light; --paper: #fff; --raised: #fff }
  body > header.nav, body > footer, .preview-bar, .certificate-actions, .certificate-record, .notice:not(.notice-error), .skip-link { display: none !important }
  html, body { background: #fff }
  body:not(.console) { min-height: 0; display: block }
  body:not(.console) > main { padding: 0 }
  body:not(.console) section.certificate-wrap { max-width: none; padding: 0; margin: 0 }
  .anim body:not(.console) > main > * { animation: none }
  .certificate {
    box-shadow: none; border-radius: 0; height: 186mm; display: flex; flex-direction: column; justify-content: space-between;
    padding: 14mm 18mm; break-inside: avoid; print-color-adjust: exact; -webkit-print-color-adjust: exact;
  }
  .certificate::before { box-shadow: inset 0 0 0 1px #B9BFCB }
  .certificate::after { inset: 5mm; border-radius: 0 }
  .certificate-head, .certificate-foot { margin: 0 }
  .certificate-name { font-size: 44pt }
  .certificate-course { font-size: 22pt }
  .certificate-foot { flex-wrap: nowrap }
  .certificate-verify { align-items: flex-end; text-align: right }
  .notice-error { margin: 0 0 4mm; padding: 3mm 5mm; border: 1px solid var(--danger) }
  .notice-error + .certificate { height: 150mm }
}

.newsletter {
  display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: clamp(1.5rem, 4vw, 3.5rem); align-items: center;
  background: var(--raised); border-radius: var(--r-container); padding: clamp(1.6rem, 4vw, 2.6rem);
  box-shadow: var(--ring), var(--e-2);
}
.newsletter-copy h2 { font-size: var(--t-subhead); letter-spacing: var(--track-subhead); margin: var(--s-2) 0 var(--s-3) }
.newsletter-copy p { color: var(--muted); font-size: var(--t-small); max-width: 44ch }
.newsletter-form { display: flex; flex-direction: column; gap: var(--s-3) }
.newsletter-row { display: flex; gap: var(--s-2) }
.newsletter-row input {
  flex: 1; min-width: 0; font: inherit; font-size: var(--t-small); padding: .7rem .9rem; min-height: var(--tap);
  border: 0; border-radius: var(--r-control); background: var(--raised); color: var(--ink);
  box-shadow: inset 0 0 0 1px var(--line);
  transition: box-shadow var(--dur) var(--ease);
}
.newsletter-row input:hover { box-shadow: inset 0 0 0 1px var(--line-strong) }
.newsletter-row input:focus-visible {
  outline: 0;
  box-shadow: inset 0 0 0 1.5px var(--accent), 0 0 0 4px color-mix(in oklab, var(--accent) 18%, transparent);
}
.newsletter-trap { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden }
.form .newsletter-row { flex-direction: column }

.final { background: var(--panel); border: 1px solid var(--panel-line); border-radius: var(--r-container); padding: clamp(2.5rem, 6vw, 4.2rem); text-align: center; color: var(--panel-ink) }
.final h2 { font-size: clamp(1.9rem, 3.6vw, 2.9rem); margin-bottom: var(--s-4) }
.final p { color: var(--panel-muted); max-width: 46ch; margin: 0 auto 2rem }
.final .hero-actions { justify-content: center }

footer { border-top: 1px solid var(--line); padding-block: 2.4rem 1.8rem; margin-top: var(--s-5) }
.foot-inner { display: flex; justify-content: space-between; gap: 2rem; flex-wrap: wrap }
.foot-links { display: flex; gap: 3rem; flex-wrap: wrap }
.foot-col summary { list-style: none; font-size: var(--t-meta); font-weight: var(--w-strong); color: var(--ink); pointer-events: none; margin-bottom: var(--s-3) }
.foot-col summary::-webkit-details-marker { display: none }
.foot-col-links { display: flex; flex-direction: column; gap: .55rem }
.foot-col a { font-size: var(--t-meta); color: var(--muted) }
.foot-col a:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 3px }
.foot-meta { font-size: var(--t-meta); color: var(--muted-dim); margin-top: 2rem }

.page-head { padding-top: clamp(2.5rem, 5vw, 3.5rem); padding-bottom: clamp(1.5rem, 3vw, 2.5rem) }
.page-head h1, .display-title { font-size: var(--t-display); margin-bottom: .9rem }
.page-head p { color: var(--muted); max-width: 58ch }

.lesson-notes { max-width: 70ch }
.foot-blurb { margin-top: var(--s-3); max-width: 32ch }

.crumbs { font-size: var(--t-small); color: var(--muted); margin: calc(-1 * var(--s-2)) 0 var(--s-2) }
.crumbs a { display: inline-flex; align-items: center; gap: .35rem; color: var(--accent); font-weight: var(--w-medium); min-height: var(--tap) }
.crumbs a::before {
  content: ""; width: .42rem; height: .42rem; flex: none; margin-top: 1px;
  border-bottom: 1.6px solid currentColor; border-left: 1.6px solid currentColor; transform: rotate(45deg);
  transition: transform var(--dur) var(--ease);
}
.crumbs a:hover { text-decoration: underline; text-underline-offset: 3px }
.crumbs a:hover::before { transform: translateX(-2px) rotate(45deg) }
.byline { display: flex; flex-wrap: wrap; gap: .45rem; margin-top: var(--s-4); font-size: var(--t-small); color: var(--muted) }
.byline b { color: var(--ink); font-weight: var(--w-medium) }

.pill {
  display: inline-flex; align-items: center; gap: .4rem;
  font-size: var(--t-meta); font-weight: 550; padding: .28rem .72rem;
  border: 0; border-radius: var(--r-pill); background: var(--hover);
  box-shadow: inset 0 0 0 1px var(--line); color: var(--muted);
  white-space: nowrap;
}
.pill-free { color: var(--ok); background: var(--ok-soft); box-shadow: inset 0 0 0 1px color-mix(in oklab, var(--ok) 30%, transparent) }
.pill-danger { color: var(--danger); background: var(--danger-soft); box-shadow: inset 0 0 0 1px color-mix(in oklab, var(--danger) 30%, transparent) }

.product { display: grid; grid-template-columns: minmax(0, 1fr) 21rem; column-gap: clamp(2rem, 4vw, 3.5rem); align-items: start; padding-bottom: clamp(3.5rem, 7vw, 5.5rem) }
.product-head { grid-column: 1 / -1 }
.product-main { grid-column: 1; grid-row: 2; min-width: 0 }
.product-main > .prose p { max-width: 62ch }
.product-main .curriculum { margin-top: 0 }
.product-aside { grid-column: 2; grid-row: 2; position: sticky; top: calc(var(--nav-h) + var(--s-4)) }
.buybox {
  display: flex; flex-direction: column; gap: var(--s-4);
  background: var(--raised); border-radius: var(--r-container); padding: 1.4rem 1.5rem 1.5rem;
  box-shadow: var(--ring), var(--e-2);
}
.buybox .btn, .buybox .inline-form, .buybox .inline-form .btn { width: 100%; display: flex }
.buybox .quietlink { font-size: var(--t-small); text-align: center; margin-top: calc(-1 * var(--s-2)) }
.buybox .pill { align-self: flex-start }
.buybox-price { font-family: var(--font-sans); font-size: 2.3rem; font-weight: 600; line-height: 1; letter-spacing: var(--track-display); display: flex; align-items: baseline; gap: .6rem; flex-wrap: wrap }
.buybox-price small { font-family: var(--font-sans); font-size: var(--t-small); font-weight: 500; color: var(--muted); letter-spacing: var(--track-body) }
.buybox-state, .buybox-next { display: flex; flex-direction: column; gap: .4rem }
.buybox-state .progress-bar { margin-top: .1rem }
.buybox-title { font-weight: 600; font-size: var(--t-body); letter-spacing: var(--track-heading); text-wrap: pretty }
.buybox-note { font-size: var(--t-small); color: var(--muted) }
.buybox .glance { max-width: none; border-top: 1px solid var(--line); padding-top: var(--s-2); margin-top: var(--s-1) }
.buybox .glance div { padding: .6rem 0 .6rem 1.5rem; font-size: var(--t-meta); color: var(--muted) }
.buybox .glance div::before { top: 1.02rem; left: 0 }
.buybox .glance div:last-child { padding-bottom: 0 }
.buybox-was { font-size: 1.5rem; font-weight: 500; color: var(--muted-dim); text-decoration-thickness: 2px }

.buy-form { flex-direction: column; gap: var(--s-4) }
.coupon { display: flex; flex-direction: column; gap: .35rem; width: 100% }
.coupon-label { font-size: var(--t-small); color: var(--muted) }
.coupon-row { display: flex; gap: var(--s-2); align-items: stretch }
.coupon-input {
  font: inherit; font-size: var(--t-small); padding: .7rem .9rem; min-height: var(--tap);
  flex: 1; min-width: 0;
  border: 0; border-radius: var(--r-control); background: var(--raised); color: var(--ink);
  box-shadow: inset 0 0 0 1px var(--line);
  transition: box-shadow var(--dur) var(--ease), background var(--dur) var(--ease);
}
.coupon .coupon-input { text-transform: uppercase }
.coupon .coupon-input::placeholder { text-transform: none }
.coupon-input:hover { box-shadow: inset 0 0 0 1px var(--line-strong) }
.coupon-input:focus-visible {
  outline: 0;
  box-shadow: inset 0 0 0 1.5px var(--accent), 0 0 0 4px color-mix(in oklab, var(--accent) 18%, transparent);
}
.buybox .buy-form .coupon-apply { width: auto; flex: 0 0 auto; display: inline-flex; white-space: nowrap }
.coupon-note { font-size: var(--t-meta); color: var(--muted); min-height: 1.1rem }
.coupon-note.coupon-bad { color: var(--danger) }
.coupon-note.coupon-good { color: var(--ok) }

.waitlist { display: flex; flex-direction: column; gap: .35rem; width: 100% }
.waitlist .coupon-row { flex-direction: column }
.waitlist .trap { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0 }
.waitlist-done { display: flex; flex-direction: column; gap: var(--s-2); align-items: flex-start }
.pill-soon { background: var(--tint-strong); color: var(--accent-deep) }

.stars { display: inline-flex; gap: .1rem; line-height: 1 }
.star { color: var(--line-strong); font-size: 1.05rem }
.star-on { color: #C8880C }
.rating-badge, .rating-lede { display: flex; align-items: center; gap: var(--s-2); flex-wrap: wrap }
.rating-badge { margin-top: var(--s-2) }
.rating-count { font-size: var(--t-small); color: var(--muted) }
.reviews { margin-top: var(--s-6) }
.review-list { list-style: none; padding: 0; margin: var(--s-4) 0 0; display: flex; flex-direction: column; gap: var(--s-4) }
.review { border-top: 1px solid var(--line); padding-top: var(--s-4); display: flex; flex-direction: column; gap: .35rem }
.review-who { font-size: var(--t-small); color: var(--muted) }
.review-body { max-width: 62ch; text-wrap: pretty; white-space: pre-line }
.review-quote { max-width: 46ch; white-space: pre-line; margin: 0 }
.review-mine { background: var(--raised); border-radius: var(--r-container); box-shadow: var(--ring), var(--e-1); padding: 1.2rem 1.3rem; margin-top: var(--s-4); display: flex; flex-direction: column; gap: var(--s-3) }
.review-state { display: flex; align-items: center; gap: var(--s-2) }
.review-form { display: flex; flex-direction: column; gap: var(--s-3) }
.review-form textarea { font: inherit; font-size: var(--t-small); padding: .7rem .9rem; border: 0; border-radius: var(--r-control); background: var(--paper); color: var(--ink); box-shadow: inset 0 0 0 1px var(--line); resize: vertical }
.review-form textarea:focus-visible { outline: 0; box-shadow: inset 0 0 0 1.5px var(--accent), 0 0 0 4px color-mix(in oklab, var(--accent) 18%, transparent) }
.review-actions { display: flex; align-items: center; gap: var(--s-4); flex-wrap: wrap }
.star-pick { border: 0; padding: 0; margin: 0; display: inline-flex; flex-direction: row-reverse; justify-content: flex-end }
.star-pick legend { font-size: var(--t-small); color: var(--muted); padding: 0 0 .3rem }
.star-pick input { position: absolute; opacity: 0; width: 1px; height: 1px }
.star-pick label { font-size: 1.6rem; line-height: 1; color: var(--line-strong); cursor: pointer; padding: 0 .1rem; transition: color var(--dur) var(--ease) }
.star-pick label:hover, .star-pick label:hover ~ label,
.star-pick input:checked ~ label { color: #C8880C }
.star-pick input:focus-visible + label { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px }
.catalog-filter { display: flex; gap: var(--s-4); align-items: center; flex-wrap: wrap; margin-bottom: var(--s-5) }
.catalog-filter .coupon-input {
  flex: 1 1 16rem; min-width: 12rem; padding-left: 2.35rem;
  border-radius: var(--r-pill);
  background: var(--raised) no-repeat .95rem 50% / 1rem
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='%23878F9D' stroke-width='1.5' stroke-linecap='round'%3E%3Ccircle cx='7.1' cy='7.1' r='4.2'/%3E%3Cpath d='M10.2 10.2l3 3'/%3E%3C/svg%3E");
}
.filter-chips {
  display: inline-flex; gap: 2px; padding: 3px; border-radius: var(--r-pill);
  background: color-mix(in oklab, var(--ink) 7%, transparent);
}
.chip {
  font: inherit; font-size: var(--t-small); font-weight: var(--w-medium); padding: .45rem 1rem; min-height: calc(var(--tap) - 6px);
  border: 0; border-radius: var(--r-pill); background: transparent; color: var(--muted); cursor: pointer; white-space: nowrap;
  transition: box-shadow var(--dur) var(--ease), color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.chip:hover { color: var(--ink) }
.chip:active { transform: scale(.97) }
.chip[aria-pressed="true"] { background: var(--raised); color: var(--ink); box-shadow: 0 1px 3px rgba(16, 20, 28, .12), var(--ring) }
.question-mark { font-size: var(--t-small); margin-top: var(--s-2); text-wrap: pretty }
.question-mark.question-right { color: var(--ok) }
.question-mark.question-wrong { color: var(--danger) }
.linkbtn { font: inherit; background: none; border: 0; padding: 0; color: var(--accent); text-decoration: underline; cursor: pointer }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap }
.card-soon .foot .pill-soon { font-size: var(--t-meta) }

.settings-shell {
  display: grid; grid-template-columns: 15rem minmax(0, 44rem); gap: clamp(2rem, 5vw, 4.5rem);
  padding-block: clamp(2.5rem, 5vw, 3.5rem) clamp(3.5rem, 7vw, 5.5rem); align-items: start;
}
.settings-nav { position: sticky; top: calc(var(--nav-h) + var(--s-5)) }
.settings-who { display: flex; align-items: center; gap: var(--s-3); padding: 0 .7rem var(--s-5) }
.settings-who-name { display: flex; flex-direction: column; min-width: 0 }
.settings-who-name b { font-size: var(--t-small); font-weight: var(--w-strong); overflow: hidden; text-overflow: ellipsis; white-space: nowrap }
.settings-who-name span { font-size: var(--t-meta); color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap }
.avatar-large { width: 2.75rem; height: 2.75rem; font-size: 1rem }
.settings-nav ul { list-style: none; display: flex; flex-direction: column; gap: 2px }
.settings-nav a {
  display: flex; align-items: center; gap: .7rem; min-height: 2.6rem; padding: .5rem .7rem; border-radius: var(--r-control);
  font-size: var(--t-small); color: var(--ink); transition: background var(--dur-fast) var(--ease);
}
.settings-nav a .icon { width: 1rem; height: 1rem; color: var(--muted) }
.settings-nav a:hover { background: var(--hover) }
.settings-nav a[aria-current="page"] { background: var(--raised); font-weight: var(--w-strong); box-shadow: var(--ring), var(--e-1) }
.settings-nav a[aria-current="page"] .icon { color: var(--accent) }
.settings-head { margin-bottom: var(--s-6) }
.settings-head h1 { font-size: var(--t-section); letter-spacing: var(--track-section); margin-bottom: var(--s-2) }
.settings-head p { color: var(--muted) }
body:not(.console) section.settings-section { padding-block: 0 }
.settings-section + .settings-section { margin-top: var(--s-6) }
.settings-title { font-size: var(--t-heading); letter-spacing: var(--track-heading); margin-bottom: var(--s-3) }
.settings-form { display: flex; flex-direction: column; gap: var(--s-4); padding: 1.25rem }
.settings-form .field input { background: var(--paper) }
.settings-actions { display: flex; justify-content: flex-end }
.settings-promo .settings-label { display: flex; flex-direction: column; gap: .25rem }
.settings-promo .settings-label b { font-weight: var(--w-strong) }
.settings-promo .settings-label span { color: var(--muted); text-wrap: pretty; line-height: var(--lh-prose) }
.settings-empty { color: var(--muted); gap: var(--s-3); padding-block: 1.1rem }
.settings-empty .icon { width: 1.1rem; height: 1.1rem; flex: none }
.settings-shell .receipts { max-width: none }

.confirm { margin-top: var(--s-4) }
.confirm > summary { list-style: none; display: inline-flex }
.confirm > summary::-webkit-details-marker { display: none }
.confirm[open] > summary { display: none }
.confirm-panel {
  display: flex; flex-direction: column; gap: var(--s-4); padding: 1.2rem 1.25rem;
  background: var(--danger-soft); border-radius: var(--r-container);
  box-shadow: inset 0 0 0 1px color-mix(in oklab, var(--danger) 28%, transparent);
  animation: sheet-in var(--dur) var(--ease);
}
.confirm-panel p { font-size: var(--t-small); color: var(--muted); line-height: var(--lh-prose) }
.confirm-panel p b { display: block; color: var(--ink); font-size: var(--t-body); margin-bottom: .2rem }
.btn-danger { color: var(--danger) }
.btn-danger:hover { box-shadow: inset 0 0 0 1px var(--danger); background: var(--danger-soft) }
.btn-danger-fill { background: var(--danger); color: var(--paper); box-shadow: var(--e-1) }
.btn-danger-fill:hover { background: color-mix(in oklab, var(--danger) 86%, #000) }

.settings-group { background: var(--raised); border-radius: var(--r-container); box-shadow: var(--ring), var(--e-1); overflow: hidden; max-width: 36rem }
.settings-shell .settings-group { max-width: none }
.settings-row { display: flex; align-items: center; gap: var(--s-4); padding: .85rem 1.25rem; min-height: var(--tap); border-bottom: 1px solid var(--line); font-size: var(--t-small) }
.settings-row:last-child { border-bottom: 0 }
.settings-label { flex: 1; min-width: 0; color: var(--ink) }
.settings-value { color: var(--muted); text-align: right; overflow-wrap: anywhere; font-variant-numeric: tabular-nums }
.settings-link { transition: background var(--dur) var(--ease) }
.settings-link:hover { background: var(--hover) }
.settings-link:active { background: var(--tint); transition-duration: var(--dur-fast) }
.settings-chevron { display: inline-flex; color: var(--muted-dim) }
.settings-chevron .icon { width: 1rem; height: 1rem }

.receipts { list-style: none; background: var(--raised); border-radius: var(--r-container); box-shadow: var(--ring), var(--e-1); overflow: hidden; max-width: 44rem }
.receipt { display: grid; grid-template-columns: minmax(0, 1fr) auto auto 5.5rem; gap: var(--s-4); align-items: center; padding: .9rem 1.25rem; border-bottom: 1px solid var(--line); font-size: var(--t-small) }
.receipt:last-child { border-bottom: 0 }
.receipt-item { font-weight: 550; overflow-wrap: anywhere }
.receipt-item:hover { color: var(--accent) }
.receipt-date { color: var(--muted); white-space: nowrap }
.receipt-amount { text-align: right; font-weight: 600 }

.pending-mark {
  display: block; width: 2.4rem; height: 2.4rem; margin: 0 auto var(--s-4);
  border-radius: 50%; border: 2.5px solid var(--line);
  border-top-color: var(--accent); animation: spin 1.1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg) } }
@media (prefers-reduced-motion: reduce) {
  .pending-mark { animation: none; border-color: var(--accent) }
}

.legal-updated { font-size: var(--t-small); color: var(--muted-dim); margin-top: var(--s-3) }
.legal-contents {
  background: var(--raised); border-radius: var(--r-container); padding: 1.2rem 1.4rem;
  box-shadow: var(--ring), var(--e-1); margin-bottom: var(--s-6); max-width: 68ch;
}
.legal-contents ol { margin: var(--s-3) 0 0 1.1rem; display: flex; flex-direction: column; gap: .3rem }
.legal-contents li { font-size: var(--t-small) }
.legal-contents a { color: var(--accent) }
.legal-contents a:hover { text-decoration: underline; text-underline-offset: 3px }
.legal-body h2 { scroll-margin-top: 5rem; font-size: var(--t-heading); margin-top: 2.6rem }
.legal-body h2:first-child { margin-top: 0 }

.centred-head { text-align: center; padding-bottom: var(--s-5) }
.centred-head h1, .centred-head p { margin-inline: auto }
.centred-body { display: flex; flex-direction: column; align-items: center; gap: var(--s-5); text-align: center }
.centred-body > * { width: 100%; max-width: 26rem }
.centred-body .form, .centred-body .post { margin-inline: auto; text-align: left }
.centred-body .hero-actions { justify-content: center }
.centred-body .btn { width: auto }
main:has(> .centred-head) { display: flex; flex-direction: column; justify-content: center; padding-block: clamp(2rem, 6vh, 5rem) }
main:has(> .centred-head) > * { width: 100% }
.lesson-meta { display: inline-flex; align-items: center; gap: var(--s-2); flex: none }
.kind { width: .85rem; height: .85rem; flex: none; fill: none; stroke: currentColor; stroke-width: 1.3; stroke-linecap: round; stroke-linejoin: round; color: var(--muted-dim) }
.lock { width: .85rem; height: .85rem; flex: none; fill: none; stroke: currentColor; stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; color: var(--muted-dim) }

.glance { display: flex; flex-direction: column; gap: 0; max-width: 24rem }
.glance div {
  font-size: var(--t-small); color: var(--ink); padding: .72rem 0 .72rem 1.6rem;
  border-bottom: 1px solid var(--line); font-variant-numeric: tabular-nums; position: relative;
}
.glance div:last-child { border-bottom: 0 }
.glance div::before {
  content: ""; position: absolute; left: .1rem; top: 1.16rem;
  width: .62rem; height: .34rem; border-left: 1.8px solid var(--accent); border-bottom: 1.8px solid var(--accent);
  transform: rotate(-45deg);
}

.curriculum { display: flex; flex-direction: column; gap: var(--s-4); margin-top: 2rem }
.module { background: var(--raised); border: 0; border-radius: var(--r-container); overflow: hidden; box-shadow: var(--ring), var(--e-1) }
.module > h3 { padding: var(--s-4) 1.25rem; border-bottom: 1px solid var(--line); font-size: var(--t-body) }
.module-summary {
  display: flex; align-items: center; gap: var(--s-3); cursor: pointer;
  padding: var(--s-4) 1.25rem; font-size: var(--t-body); font-weight: 600;
  list-style: none; min-height: var(--tap);
}
.module-summary::-webkit-details-marker { display: none }
.module[open] .module-summary { border-bottom: 1px solid var(--line) }
.module-summary:hover { background: var(--hover) }
.module-summary:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px }
.module-summary::after {
  content: ""; width: .5rem; height: .5rem; flex: none; margin-left: var(--s-2);
  border-right: 2px solid var(--muted-dim); border-bottom: 2px solid var(--muted-dim);
  transform: rotate(-45deg); transition: transform var(--dur) var(--ease);
}
.module[open] .module-summary::after { transform: rotate(45deg) }
.module-index {
  flex: none; width: 1.75rem; height: 1.75rem; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--tint); color: var(--accent); font-size: var(--t-meta); font-weight: 650;
  font-variant-numeric: tabular-nums;
}
.module-title { flex: 1; min-width: 0 }
.module-count { font-size: var(--t-meta); color: var(--muted-dim); font-weight: 400; font-variant-numeric: tabular-nums }
.module ol { list-style: none }
.module li { border-bottom: 1px solid var(--line) }
.module li:last-child { border-bottom: 0 }
.module li a, .module li .locked { display: flex; justify-content: space-between; align-items: center; gap: var(--s-4); padding: .85rem 1.25rem; font-size: var(--t-small); min-height: var(--tap) }
.module li a:hover { background: var(--hover) }
.module li .locked { color: var(--muted-dim) }
.lesson-num { font-size: var(--t-meta); color: var(--muted-dim); margin-right: .8rem; font-variant-numeric: tabular-nums }
.lesson-name { display: flex; align-items: baseline; min-width: 0 }
.tick { color: var(--ok); font-size: var(--t-meta); margin-right: .8rem; width: 1.4em; flex: none }
.lesson-num { width: 1.4em; flex: none }
.module li a[aria-current="page"] { background: var(--hover); box-shadow: inset 3px 0 0 var(--accent); font-weight: 500 }

.exit-bar {
  position: sticky; top: 0; z-index: 20; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr) minmax(0, 1fr);
  align-items: center; gap: var(--s-3); height: var(--bar); padding-inline: var(--s-3);
  background: var(--nav-bg); border-bottom: 1px solid var(--line);
  backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px);
}
.exit-back {
  justify-self: start; display: inline-flex; align-items: center; gap: .4rem; min-width: 0; max-width: 100%;
  min-height: var(--tap); padding: 0 .6rem 0 .4rem; border-radius: var(--r-control);
  font-size: var(--t-small); font-weight: var(--w-medium); color: var(--accent);
  transition: background var(--dur-fast) var(--ease);
}
.exit-back:hover { background: var(--hover) }
.exit-back-label { overflow: hidden; text-overflow: ellipsis; white-space: nowrap }
.exit-chevron {
  flex: none; width: .5rem; height: .5rem; margin: 0 .15rem 0 .3rem;
  border-bottom: 1.8px solid currentColor; border-left: 1.8px solid currentColor; transform: rotate(45deg);
}
.exit-chevron-next { transform: rotate(-135deg); margin: 0 .3rem 0 .1rem }
.exit-title { display: flex; flex-direction: column; align-items: center; min-width: 0; text-align: center; line-height: 1.25 }
.exit-place { font-size: var(--t-micro); font-weight: var(--w-medium); color: var(--muted); font-variant-numeric: tabular-nums }
.exit-name { max-width: 100%; font-size: var(--t-small); font-weight: var(--w-strong); overflow: hidden; text-overflow: ellipsis; white-space: nowrap }
.exit-steps { justify-self: end; display: flex; align-items: center; gap: 2px }
.exit-step {
  display: inline-flex; align-items: center; justify-content: center; min-width: var(--tap); height: 2.25rem;
  border-radius: var(--r-pill); color: var(--ink); font-size: var(--t-small); font-weight: var(--w-medium);
  transition: background var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease-out);
}
.exit-step-form { display: contents }
button.exit-step { border: 0; font: inherit; font-size: var(--t-small); font-weight: var(--w-medium); cursor: pointer }
:is(a, button).exit-step:hover { background: var(--hover) }
:is(a, button).exit-step:active { transform: scale(.95) }
.exit-step[data-off] { color: var(--muted-dim); opacity: .45 }
.exit-next { padding: 0 .5rem 0 .95rem; background: var(--accent); color: var(--accent-ink) }
:is(a, button).exit-next:hover { background: var(--accent-deep) }
.exit-progress { position: absolute; left: 0; right: 0; bottom: -1px; height: 2px; pointer-events: none }
.exit-progress span { display: block; height: 100%; width: 0; background: var(--accent); transition: width 120ms linear }
@media (max-width: 640px) {
  .exit-bar { grid-template-columns: auto minmax(0, 1fr) auto; padding-inline: .25rem .5rem }
  .exit-back-label { display: none }
  .exit-back { padding-inline: .5rem }
  .exit-next { padding: 0 .35rem 0 .75rem }
}

.learn { display: grid; grid-template-columns: 19rem minmax(0, 1fr); align-items: start }
.learn-toc { position: sticky; top: var(--bar); height: calc(100svh - var(--bar)); overflow-y: auto; border-right: 1px solid var(--line); background: var(--raised); padding: var(--s-4) 0 var(--s-6) }
.learn-pane { min-width: 0 }
.learn-main { max-width: 60rem; margin-inline: auto; padding: var(--s-6) var(--pad) var(--s-6) }
.learn-video .learn-main { max-width: min(100%, max(60rem, calc((100svh - 18rem) * 16 / 9))) }
.learn-video .post { max-width: 74ch }
.learn:not(.learn-video) .learn-main { max-width: min(100%, calc(118ch + 2 * var(--pad))) }
.learn:not(.learn-video) .post { max-width: 100% }
.learn:not(.learn-video) .post > p,
.learn:not(.learn-video) .post > ul,
.learn:not(.learn-video) .post > ol,
.learn:not(.learn-video) .post > blockquote,
.learn:not(.learn-video) .post > h2,
.learn:not(.learn-video) .post > h3,
.learn:not(.learn-video) .post > h4 { max-width: 74ch }
.learn-main .lesson-title { font-size: clamp(1.5rem, 2.6vw, 2rem); margin-bottom: var(--s-5) }
.learn-eyebrow { margin-bottom: var(--s-2) }

.toc-head { padding: 0 1rem var(--s-4); border-bottom: 1px solid var(--line) }
.toc-course { display: block; padding-block: .6rem; margin-block: -.6rem; font-weight: 600; font-size: var(--t-small); overflow-wrap: anywhere }
.toc-course:hover { color: var(--accent) }
.toc-count { display: block; font-size: var(--t-meta); font-weight: var(--w-medium); color: var(--muted-dim); margin-top: var(--s-2) }
.toc-head .progress-bar { margin-top: var(--s-2) }

.curriculum-rail { gap: 0; margin-top: 0 }
.curriculum-rail .module { background: none; border: 0; border-radius: 0 }
.curriculum-rail .module-summary { padding: var(--s-4) 1rem var(--s-2); font-size: var(--t-meta); font-weight: var(--w-strong); color: var(--ink); min-height: 0 }
.curriculum-rail .module[open] .module-summary { border-bottom: 0 }
.curriculum-rail .module-summary:hover { background: none; color: var(--muted) }
.curriculum-rail .module-count { display: none }
.curriculum-rail .module-title { flex: 1 }
.curriculum-rail .module li { border-bottom: 0 }
.curriculum-rail .module li a, .curriculum-rail .module li .locked { padding: .55rem 1rem; font-size: var(--t-meta); gap: var(--s-2) }
.curriculum-rail .lesson-name { flex: 1; min-width: 0; align-items: center; gap: .55rem }
.curriculum-rail .pill { display: none }
.curriculum-rail .lesson-meta { gap: .45rem }
.curriculum-rail .module li a[aria-current="page"] { background: var(--hover); box-shadow: inset 3px 0 0 var(--accent); font-weight: 600 }

.rail-time { font-size: var(--t-micro); color: var(--muted-dim); white-space: nowrap; flex: none; font-variant-numeric: tabular-nums }
.status { width: 1rem; height: 1rem; flex: none; border-radius: 50%; border: 1.5px solid var(--line-strong); display: inline-flex; align-items: center; justify-content: center }
.status svg { width: .7rem; height: .7rem; fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round }
.status-done { background: var(--ok); border-color: var(--ok); color: var(--paper) }
.status-current { border-color: var(--accent); border-style: dashed }

.callout { border: 0; border-left: 3px solid var(--muted-dim); background: var(--hover); border-radius: 0 var(--r-control) var(--r-control) 0; padding: 1.1rem 1.3rem; margin-block: var(--s-5) }
.callout > :last-child { margin-bottom: 0 }
.callout-label { font-size: var(--t-small); font-weight: var(--w-strong); color: var(--muted); margin-bottom: var(--s-1) }
.callout-warning { border-left-color: var(--danger) }
.callout-warning .callout-label { color: var(--danger) }
.callout-tip { border-left-color: var(--ok) }
.callout-tip .callout-label { color: var(--ok) }
.callout-note { border-left-color: var(--accent) }
.callout-note .callout-label { color: var(--accent) }

.callout-checkpoint {
  border-left-color: var(--ok); background: var(--ok-soft);
  box-shadow: inset 0 0 0 1px color-mix(in oklab, var(--ok) 22%, transparent);
}
.callout-checkpoint .callout-label { color: var(--ok) }

.reveal {
  margin-block: var(--s-5); background: var(--hover);
  border-radius: var(--r-control); box-shadow: var(--ring);
}
.reveal > summary {
  display: flex; align-items: center; gap: .55rem; cursor: pointer;
  padding: .85rem 1.2rem; min-height: var(--tap); list-style: none;
  font-size: var(--t-small); font-weight: 550; color: var(--accent);
}
.reveal > summary::-webkit-details-marker { display: none }
.reveal > summary::before {
  content: ""; width: .4rem; height: .4rem; flex: none;
  border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor;
  transform: rotate(-45deg); transition: transform var(--dur-fast);
}
.reveal[open] > summary::before { transform: rotate(45deg) }
.reveal-body { padding: 0 1.2rem 1.15rem }
.reveal-body > :last-child { margin-bottom: 0 }

.figure { margin-block: var(--s-5) }
.figure img { display: block; width: 100%; border: 0; border-radius: var(--r-container); box-shadow: var(--ring) }
.figure figcaption { margin-top: var(--s-2); font-size: var(--t-meta); color: var(--muted-dim) }
.figure img.zoomable { cursor: zoom-in; transition: box-shadow var(--dur) var(--ease) }
.figure img.zoomable:hover { box-shadow: var(--ring-strong), var(--e-2) }
dialog.zoom {
  width: 100vw; height: 100vh; max-width: none; max-height: none; margin: 0; padding: clamp(1rem, 4vw, 3rem);
  border: 0; background: rgba(8, 10, 14, .94); color: #fff; cursor: zoom-out;
}
dialog.zoom[open] { display: grid; place-items: center; animation: zoom-in var(--dur) var(--ease) }
dialog.zoom::backdrop { background: transparent }
dialog.zoom figure { display: flex; flex-direction: column; align-items: center; gap: .8rem; max-width: 100% }
dialog.zoom img { display: block; max-width: min(100%, 1800px); max-height: calc(100vh - 7rem); object-fit: contain; border-radius: var(--r-control); background: #fff }
dialog.zoom figcaption { font-size: var(--t-small); color: rgba(255, 255, 255, .78); text-align: center; max-width: 70ch }
.zoom-close {
  position: fixed; top: max(1rem, env(safe-area-inset-top)); right: 1rem; width: var(--tap); height: var(--tap);
  border: 0; border-radius: 50%; background: rgba(255, 255, 255, .14); color: #fff; font-size: 1.5rem; line-height: 1; cursor: pointer;
}
.zoom-close:hover { background: rgba(255, 255, 255, .24) }
@keyframes zoom-in { from { opacity: 0; transform: scale(.97) } }
.figure-clip video { display: block; width: 100%; border-radius: var(--r-container); box-shadow: var(--ring); background: var(--panel) }

.artifact {
  display: flex; align-items: center; justify-content: space-between; gap: var(--s-4);
  margin-block: var(--s-5); padding: .95rem 1.25rem; min-height: var(--tap);
  background: var(--raised); border: 0; border-radius: var(--r-control);
  box-shadow: var(--ring), var(--e-1);
  transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.artifact:hover { box-shadow: var(--ring), var(--e-2); transform: translateY(-1px) }
.artifact:active { transform: none; transition-duration: var(--dur-fast) }
.artifact-name { font-family: var(--font-mono); font-size: var(--t-small); overflow-wrap: anywhere }
.artifact-hint { font-size: var(--t-small); font-weight: var(--w-medium); color: var(--accent); flex: none }
.asset-missing { font-size: var(--t-small); color: var(--muted-dim); font-style: italic }

.embed { position: relative; aspect-ratio: 16 / 9; background: #000; border: 1px solid var(--panel-line); border-radius: var(--r-container); overflow: hidden; margin-block: var(--s-5) }
.embed iframe { width: 100%; height: 100%; border: 0; display: block }

.placeholder-flat { background: var(--raised); border: 0; border-radius: var(--r-container); height: auto; padding: 3rem 2rem; box-shadow: var(--ring), var(--e-1) }
.lesson-bar { display: flex; justify-content: space-between; align-items: center; gap: var(--s-4); flex-wrap: wrap; margin-top: var(--s-6) }

.lesson-state { font-size: var(--t-small); color: var(--muted); display: flex; align-items: center; gap: var(--s-3); flex-wrap: wrap }

.lesson-steps { display: flex; gap: var(--s-3); align-items: stretch; flex-wrap: wrap }
.lesson-step {
  display: flex; flex-direction: column; justify-content: center; gap: var(--s-1);
  padding: .85rem 1.15rem; min-height: var(--tap); border: 0;
  border-radius: var(--r-control); background: var(--raised);
  box-shadow: var(--ring), var(--e-1);
  transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease), background var(--dur) var(--ease);
}
.lesson-step:hover { box-shadow: var(--ring), var(--e-2); transform: translateY(-1px) }
.lesson-step:active { transform: scale(.985); transition-duration: var(--dur-fast) }
.lesson-step-title { font-size: var(--t-small); font-weight: 500; overflow-wrap: anywhere }
.lesson-step-next {
  order: 2; margin-left: auto; max-width: 26rem; text-align: left;
  background: var(--accent); box-shadow: var(--e-2);
  color: var(--accent-ink); padding: .9rem 1.5rem;
}
.lesson-step-next .eyebrow, .lesson-step-next .lesson-step-title, .lesson-step-next .lesson-step-meta { color: var(--accent-ink) }
.lesson-step-next .lesson-step-title { font-size: var(--t-body) }
.lesson-step-next:hover { background: var(--accent-deep); box-shadow: var(--e-3) }
.lesson-step-meta { font-size: var(--t-meta); opacity: .78 }
.lesson-step-form { order: 2; margin-left: auto; max-width: 26rem }
.lesson-step-form .lesson-step { width: 100%; margin-left: 0; font: inherit; text-align: left; cursor: pointer }

@media (max-width: 560px) {
  .lesson-bar { flex-direction: column-reverse; align-items: stretch }
  .lesson-steps { flex-direction: column }
  .lesson-step-next { order: -1; max-width: none; margin-left: 0 }
  .lesson-step-form { order: -1; max-width: none; margin-left: 0 }
}

.player { background: #000; border: 1px solid var(--panel-line); border-radius: var(--r-container); overflow: hidden; aspect-ratio: 16 / 9 }
.player iframe { width: 100%; height: 100%; border: 0; display: block }
.player-placeholder { display: flex; align-items: center; justify-content: center; height: 100%; color: var(--muted-dim); font-size: var(--t-small); text-align: center; padding: 2rem }

.notice { border: 1px solid var(--line); border-left: 3px solid var(--accent); background: var(--raised); border-radius: var(--r-container); padding: 1.1rem 1.3rem; margin-block: var(--s-5) }
.notice p { color: var(--muted); font-size: var(--t-small) }
.notice p + p { margin-top: var(--s-2) }

.spot {
  display: block; width: 3.6rem; height: 3.6rem; flex: none;
  fill: none; stroke: currentColor; stroke-width: 1.5;
  stroke-linecap: round; stroke-linejoin: round;
  color: var(--muted-dim); margin-bottom: var(--s-4);
}
.centred-head .spot, .empty-state .spot { margin-inline: auto }
.empty > .spot { margin-bottom: 0 }

.empty {
  border: 0; border-radius: var(--r-container);
  padding: clamp(2.4rem, 6vw, 3.6rem) clamp(1.4rem, 4vw, 2.4rem);
  color: var(--muted); max-width: 44rem; margin-inline: auto;
  background: var(--raised); box-shadow: var(--ring), var(--e-1);
  display: flex; flex-direction: column; align-items: center; text-align: center; gap: var(--s-3);
}
.empty h2 { font-size: var(--t-subhead); letter-spacing: var(--track-subhead); color: var(--ink); margin-bottom: 0 }
.empty p { max-width: 48ch }
.empty p + p { margin-top: 0 }
.empty .btn { margin-top: var(--s-2) }

.form { max-width: 26rem; display: flex; flex-direction: column; gap: var(--s-4) }
.field { display: flex; flex-direction: column; gap: .35rem }
.field label { font-size: var(--t-small); color: var(--muted) }
.field input, .field textarea, .field select {
  font: inherit; font-size: var(--t-small); padding: .7rem .9rem; min-height: var(--tap);
  border: 0; border-radius: var(--r-control); background: var(--raised); color: var(--ink);
  box-shadow: inset 0 0 0 1px var(--line);
  transition: box-shadow var(--dur) var(--ease), background var(--dur) var(--ease);
}
.field input:hover, .field textarea:hover, .field select:hover { box-shadow: inset 0 0 0 1px var(--line-strong) }
.field input:focus-visible, .field textarea:focus-visible, .field select:focus-visible {
  outline: 0; background: var(--raised);
  box-shadow: inset 0 0 0 1.5px var(--accent), 0 0 0 4px color-mix(in oklab, var(--accent) 18%, transparent);
}
.form-error { color: var(--danger); font-size: var(--t-small) }
.form-ok { color: var(--ok); font-size: var(--t-small) }
.hint { font-size: var(--t-meta); color: var(--muted-dim) }
.ladder-plain { display: flex; flex-direction: column; gap: var(--s-3) }
.ladder-plain .pair { display: flex; gap: var(--s-4); align-items: baseline; flex-wrap: wrap }
.ladder-plain .label { min-width: 7rem; margin: 0 }
.form-note { font-size: var(--t-small); color: var(--muted-dim) }
.form-foot { font-size: var(--t-small); color: var(--muted) }

.auth-card {
  display: flex; flex-direction: column; gap: var(--s-4); text-align: left;
  background: var(--raised); border-radius: var(--r-sheet); padding: clamp(1.4rem, 4vw, 2rem);
  box-shadow: var(--ring), var(--e-2);
}
.centred-body .auth-card .form { max-width: none; margin-inline: 0 }
.centred-body .auth-card .btn { width: 100% }
.centred-body > .form-foot { text-align: center }
.provider-row { display: flex; flex-direction: column; gap: var(--s-3) }
.provider-row form { display: flex }
.provider-btn { width: 100%; gap: .6rem }
.provider-mark { width: 1.05rem; height: 1.05rem; flex: none }
.provider-or { display: flex; align-items: center; gap: var(--s-3); color: var(--muted-dim); font-size: var(--t-meta) }
.provider-or::before, .provider-or::after { content: ""; flex: 1; height: 1px; background: var(--line) }

.field-reveal { position: relative; display: flex }
.field-reveal input { flex: 1; padding-right: 4.4rem }
.field-reveal button {
  position: absolute; right: .35rem; top: 50%; transform: translateY(-50%);
  background: none; border: 0; font: inherit; font-size: var(--t-meta); color: var(--muted);
  cursor: pointer; padding: .35rem .55rem; border-radius: var(--r-control);
}
.field-reveal button:hover { color: var(--ink) }
.field-reveal button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px }

.post { max-width: 68ch; font-size: var(--t-body) }
.post h2 { font-size: var(--t-subhead); margin: 2.4rem 0 .9rem }
.post h3 { font-size: var(--t-heading); margin: 1.8rem 0 var(--s-3) }
.post p { margin-bottom: 1.1rem }
.post ul, .post ol { margin: 0 0 1.2rem 1.2rem }
.post li { margin-bottom: .4rem }
.post a { color: var(--accent); font-weight: 500 }
.post a:hover { text-decoration: underline; text-underline-offset: 3px }
.post code { font-family: var(--font-mono); font-size: .88em; background: var(--code-bg); padding: .1rem .3rem; border-radius: 3px }
.post pre { background: var(--panel); color: var(--panel-ink); padding: 1.1rem 1.3rem; border-radius: var(--r-container); overflow-x: auto; margin-bottom: 1.3rem }
.post pre code { display: block; width: max-content; min-width: 100%; background: none; padding: 0; color: inherit }

.wrap-reading .post .code { margin-inline: -2.5rem }
.code { position: relative; margin-bottom: 1.3rem }
.code pre { margin-bottom: 0 }
.code[data-language] pre { padding-top: 2.2rem }
.code[data-language]::before {
  content: attr(data-language); position: absolute; top: .6rem; left: 1.3rem; z-index: 1;
  font-family: var(--font-mono); font-size: var(--t-micro); letter-spacing: .08em;
  text-transform: uppercase; color: var(--code-comment); pointer-events: none;
}
.chroma .c, .chroma .ch, .chroma .cm, .chroma .c1, .chroma .cs,
.chroma .cp, .chroma .cpf { color: var(--code-comment); font-style: italic }
.chroma .k, .chroma .kc, .chroma .kd, .chroma .kn, .chroma .kp,
.chroma .kr, .chroma .kt, .chroma .ow { color: var(--code-keyword) }
.chroma .s, .chroma .sa, .chroma .sb, .chroma .sc, .chroma .dl, .chroma .sd,
.chroma .s2, .chroma .se, .chroma .sh, .chroma .si, .chroma .sx, .chroma .sr,
.chroma .s1, .chroma .ss { color: var(--code-string) }
.chroma .m, .chroma .mb, .chroma .mf, .chroma .mh, .chroma .mi,
.chroma .il, .chroma .mo { color: var(--code-number) }
.chroma .nf, .chroma .nd, .chroma .nc { color: var(--code-func) }
.chroma .na, .chroma .nb, .chroma .no, .chroma .nv, .chroma .nt { color: var(--code-name) }
.chroma .gi { color: var(--code-added) }
.chroma .gd { color: var(--code-removed) }
.chroma .ge { font-style: italic }
.chroma .gs { font-weight: 600 }
.chroma .err { color: var(--code-removed) }
.chroma .lnt, .chroma .ln { color: var(--code-comment); user-select: none }

.chroma .hl, .chroma .line.del {
  display: block; position: relative;
  margin-inline: -1.3rem; padding-left: calc(1.3rem - 3px); padding-right: 1.3rem;
  background: color-mix(in oklab, var(--code-added) 13%, transparent);
  border-left: 3px solid color-mix(in oklab, var(--code-added) 70%, transparent);
}

.chroma .line.del {
  background: color-mix(in oklab, var(--code-removed) 13%, transparent);
  border-left-color: color-mix(in oklab, var(--code-removed) 70%, transparent);
  opacity: .72;
}

.code[data-add] .chroma .hl:not(.del)::before, .chroma .line.del::before {
  position: absolute; left: .34rem; top: 0;
  font-weight: 600; opacity: .85; pointer-events: none; user-select: none;
}
.code[data-add] .chroma .hl:not(.del)::before { content: "+"; color: var(--code-added) }
.chroma .line.del::before { content: "\2212"; color: var(--code-removed) }

.code[data-title]::before {
  content: attr(data-title); text-transform: none; letter-spacing: 0;
  font-size: var(--t-meta); color: var(--panel-muted);
}
.code[data-title] pre { padding-top: 2.4rem }

.code-copy {
  position: absolute; top: .5rem; right: .6rem; z-index: 2;
  font: inherit; font-size: var(--t-micro); font-weight: 550; letter-spacing: .04em;
  padding: .32rem .72rem; border: 0; border-radius: var(--r-control);
  background: var(--panel-raised); color: var(--panel-muted);
  box-shadow: inset 0 0 0 1px var(--panel-line); cursor: pointer;
  opacity: 0; transition: opacity var(--dur-fast), color var(--dur-fast);
}
.code:hover .code-copy, .code-copy:focus-visible { opacity: 1 }
.code-copy:hover { color: var(--panel-ink) }
.code-copy[data-copied] { opacity: 1; color: var(--code-added) }
@media (hover: none) { .code-copy { opacity: 1 } }

.lesson-outline { display: none }
@media (min-width: 1400px) {
  .learn:not(.learn-video) .learn-main:has(.lesson-outline) { display: grid; grid-template-columns: minmax(0, 1fr) 13rem; column-gap: var(--s-6); align-items: start }
  .learn:not(.learn-video) .learn-main:has(.lesson-outline) > :not(.lesson-outline) { grid-column: 1 }
  .lesson-outline {
    display: block; grid-column: 2; grid-row: 1 / span 99;
    position: sticky; top: calc(var(--bar) + var(--s-5));
    max-height: calc(100svh - var(--bar) - var(--s-6)); overflow-y: auto;
    border-left: 1px solid var(--line); padding-left: 0;
  }
  .lesson-outline b { display: block; font-size: var(--t-meta); font-weight: var(--w-strong); color: var(--ink); margin-bottom: var(--s-2); padding-left: .9rem }
  .lesson-outline a {
    display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; line-clamp: 2; overflow: hidden;
    font-size: var(--t-meta); line-height: 1.4; color: var(--muted); padding: .28rem 0 .28rem .9rem;
    margin-left: -1px; border-left: 2px solid transparent; transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
  }
  .lesson-outline a:hover { color: var(--ink) }
  .lesson-outline a[aria-current="true"] { color: var(--accent); font-weight: var(--w-medium); border-left-color: var(--accent) }
  .lesson-outline .outline-sub { padding-left: 1.7rem }
}
.post :is(h2, h3) { scroll-margin-top: calc(var(--bar) + var(--s-4)) }

.post blockquote { border-left: 3px solid var(--line); padding-left: 1.1rem; color: var(--muted); margin-bottom: 1.2rem }
.post table { display: block; overflow-x: auto; max-width: 100%; border-collapse: collapse; margin-bottom: 1.3rem; font-size: var(--t-small) }
.post th, .post td { text-align: left; padding: .5rem .8rem; border-bottom: 1px solid var(--line); vertical-align: top }
.post th { font-weight: 600; white-space: nowrap }
.post tbody tr:last-child td { border-bottom: 0 }
.post strong { font-weight: 600 }

.toc-toggle { display: none }
.toc-scrim { display: none }

@media (max-width: 960px) {
  .learn { grid-template-columns: 1fr }
  .learn-main { padding-top: var(--s-5) }

  .toc-toggle {
    position: fixed; z-index: 32; left: var(--s-4); bottom: calc(var(--s-4) + env(safe-area-inset-bottom));
    display: inline-flex; align-items: center; gap: .55rem;
    min-height: var(--tap); padding: .6rem 1.15rem;
    font: inherit; font-size: var(--t-small); font-weight: 550; color: var(--ink);
    background: var(--nav-bg); backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border: 0; border-radius: var(--r-pill); cursor: pointer;
    box-shadow: var(--ring-strong), var(--e-3);
    transition: transform var(--dur-fast) var(--ease-out), opacity var(--dur) var(--ease);
  }
  .toc-toggle:active { transform: scale(.95) }
  .toc-toggle-bars { display: grid; gap: 3px; width: .85rem }
  .toc-toggle-bars span { display: block; height: 1.8px; border-radius: 1px; background: currentColor }
  .toc-toggle-bars span:nth-child(2) { width: 70% }

  .toc-scrim {
    display: block; position: fixed; inset: 0; z-index: 33;
    background: var(--scrim); opacity: 0;
    transition: opacity var(--dur) var(--ease);
  }
  .toc-scrim.open { opacity: 1 }
  .toc-scrim[hidden] { display: none }

  .learn-toc {
    position: fixed; z-index: 34; inset: 0 auto 0 0;
    width: min(21rem, 86vw); height: 100svh;
    border-right: 0; border-radius: 0 var(--r-sheet) var(--r-sheet) 0;
    padding-top: var(--s-5); overflow-y: auto; overscroll-behavior: contain;
    box-shadow: var(--e-4);
    transform: translateX(-100%);
    transition: transform var(--dur) var(--ease);
  }
  .learn-toc.open { transform: none }
  .toc-open { overflow: hidden }
}

@media (max-width: 1040px) {
  .nav-inner { grid-template-columns: auto minmax(0, 1fr) auto }
  .nav-links { justify-self: center }
  .nav-primary a, .nav-learning { padding-inline: .5rem }
}

@media (max-width: 960px) {
  .price-grid-three { grid-template-columns: 1fr; max-width: 800px }
  .path {
    grid-template-columns: none; grid-auto-flow: column; grid-auto-columns: minmax(12.5rem, 1fr);
    overflow-x: auto; overscroll-behavior-x: contain; scroll-snap-type: x mandatory; scrollbar-width: none;
    margin-inline: calc(-1 * var(--pad)); padding: 4px var(--pad) var(--s-4); scroll-padding-inline: var(--pad);
  }
  .path::-webkit-scrollbar { display: none }
  .path-step { scroll-snap-align: start }
}

@media (max-width: 840px) {
  .feature, .split, .price-grid, .newsletter { grid-template-columns: 1fr }
  .sec-head-row { flex-direction: column; align-items: flex-start; gap: var(--s-3) }
  .settings-shell { grid-template-columns: minmax(0, 1fr); gap: var(--s-5); padding-top: var(--s-4) }
  .settings-nav { position: static }
  .settings-who { display: none }
  .settings-nav ul {
    flex-direction: row; gap: 2px; padding: 3px; border-radius: var(--r-pill); width: max-content; max-width: 100%;
    overflow-x: auto; scrollbar-width: none; background: color-mix(in oklab, var(--ink) 7%, transparent);
  }
  .settings-nav a { border-radius: var(--r-pill); padding: .45rem .95rem; min-height: calc(var(--tap) - 6px); white-space: nowrap }
  .settings-nav a .icon, .settings-nav-long { display: none }
  .product { grid-template-columns: minmax(0, 1fr); row-gap: var(--s-5) }
  .product-head, .product-aside, .product-main { grid-column: 1; grid-row: auto }
  .product-aside { position: static }
  .product-main > .subhead { margin-top: var(--s-2) }
  .nav-inner { grid-template-columns: 1fr auto }
  .nav-learning, .account-menu, .nav-cta { display: none }
  .nav-toggle { display: block }
  .nav-toggle.nav-close, header.nav:has(#nav-links:target) .nav-toggle:not(.nav-close) { display: none }
  header.nav:has(#nav-links:target) .nav-toggle.nav-close { display: block }
  .nav-links { display: none }
  .nav-links:target, .nav-links.open {
    display: flex; flex-direction: column; align-items: stretch; justify-self: stretch; gap: var(--s-5);
    position: fixed; z-index: 39; inset: var(--nav-h) 0 0 0;
    padding: var(--s-3) var(--pad) calc(var(--s-6) + env(safe-area-inset-bottom));
    background: var(--paper); overflow-y: auto; overscroll-behavior: contain;
    animation: sheet-in var(--dur) var(--ease);
  }
  .nav-primary { flex-direction: column; align-items: stretch; gap: 0 }
  .nav-primary a {
    font-size: 1.65rem; font-weight: var(--w-heading); letter-spacing: var(--track-subhead); color: var(--ink);
    padding: .5rem 0; border-radius: 0; min-height: var(--tap);
  }
  .nav-primary a[aria-current="page"] { color: var(--accent) }
  .nav-sheet-account { display: flex; flex-direction: column; gap: var(--s-3); border-top: 1px solid var(--line); padding-top: var(--s-5) }
  .nav-sheet-account .btn { width: 100% }
  .nav-sheet-who { display: flex; align-items: center; gap: var(--s-3); padding-bottom: var(--s-2) }
  .nav-sheet-name { display: flex; flex-direction: column; min-width: 0 }
  .nav-sheet-account .menu-list a, .nav-sheet-account .menu-list button { min-height: var(--tap); padding-inline: 0; font-size: var(--t-body) }
  .nav-sheet-account .menu-sep { margin-inline: 0 }
  .nav-open { overflow: hidden }
  header.nav:has(#nav-links:target, #nav-links.open) {
    background: var(--paper); border-bottom-color: var(--line);
    backdrop-filter: none; -webkit-backdrop-filter: none;
  }
}
@keyframes sheet-in { from { opacity: 0; transform: translateY(-8px) } }

@media (max-width: 560px) {
  .grid { grid-template-columns: 1fr }
  .hero-actions { flex-direction: column; align-items: stretch; gap: var(--s-3) }
  .hero-actions .btn, .form .btn { width: 100% }
  .newsletter-row { flex-direction: column }
  .newsletter-row .btn { width: 100% }
  .quiz-verdict { flex-direction: column; align-items: flex-start; gap: var(--s-3) }
  .certificate-foot, .certificate-verify { align-items: flex-start; text-align: left }
  .form { max-width: none }
  .foot-inner { flex-direction: column; gap: var(--s-5) }
  .foot-links { flex-direction: column; gap: 0 }
  .foot-col { border-bottom: 1px solid var(--line) }
  .foot-col summary {
    display: flex; justify-content: space-between; align-items: center; min-height: var(--tap);
    pointer-events: auto; cursor: pointer; color: var(--ink); margin-bottom: 0; font-size: var(--t-small);
  }
  .foot-col summary::after {
    content: ""; width: .45rem; height: .45rem; margin-right: .2rem;
    border-right: 1.5px solid var(--muted); border-bottom: 1.5px solid var(--muted);
    transform: translateY(-2px) rotate(45deg); transition: transform var(--dur) var(--ease);
  }
  .foot-col[open] summary::after { transform: translateY(2px) rotate(-135deg) }
  .foot-col-links { padding-bottom: var(--s-3); gap: 0 }
  .foot-col-links a { display: flex; align-items: center; min-height: 2.75rem; font-size: var(--t-small) }
  .price { padding: 1.35rem }
  .card { padding: 0 1.25rem 1.25rem }
  .card-art { margin-inline: -1.25rem; margin-bottom: 1.25rem }
  .module li a, .module li .locked { padding: .85rem var(--s-4) }
  .post { font-size: var(--t-body) }
  .wrap-reading .post .code { margin-inline: 0 }
  .ladder-plain .pair { flex-direction: column; gap: var(--s-1) }
  .ladder-plain .label { min-width: 0 }
  .receipt { grid-template-columns: minmax(0, 1fr) auto; row-gap: .3rem }
  .receipt-item { grid-column: 1; grid-row: 1 }
  .receipt-amount { grid-column: 2; grid-row: 1 }
  .receipt-date { grid-column: 1; grid-row: 2 }
  .receipt .pill { grid-column: 2; grid-row: 2; justify-self: end }
}

@view-transition { navigation: auto }

@keyframes rise {
  from { opacity: 0; transform: translateY(10px) }
  to { opacity: 1; transform: none }
}

.anim body:not(.console) > main > * { animation: rise var(--dur-slow) var(--ease-out) backwards }
.anim body:not(.console) > main > *:nth-child(2) { animation-delay: 55ms }
.anim body:not(.console) > main > *:nth-child(3) { animation-delay: 100ms }
.anim body:not(.console) > main > *:nth-child(n + 4) { animation-delay: 135ms }

.anim .grid > .card { animation: rise var(--dur-slow) var(--ease-out) backwards }
.anim .grid > .card:nth-child(2) { animation-delay: 50ms }
.anim .grid > .card:nth-child(3) { animation-delay: 100ms }
.anim .grid > .card:nth-child(4) { animation-delay: 150ms }
.anim .grid > .card:nth-child(5) { animation-delay: 200ms }
.anim .grid > .card:nth-child(n + 6) { animation-delay: 240ms }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important }
  @view-transition { navigation: none }
}

.player { position: relative }
.watermark {
  position: absolute; top: .7rem; right: .9rem; z-index: 2; pointer-events: none;
  font-family: var(--font-mono); font-size: 10px; color: rgba(255, 255, 255, .18);
  letter-spacing: .02em; transition: color .2s ease;
}
.player:hover .watermark { color: rgba(255, 255, 255, .4) }
@media (prefers-reduced-motion: reduce) { .watermark { transition: none } }
.progress-bar { height: 4px; background: var(--line); border-radius: 2px; overflow: hidden; margin-top: .8rem }
.progress-bar span { display: block; height: 100%; background: var(--accent) }
.module li .done { color: var(--ok); font-size: var(--t-meta); font-weight: 550 }