/* Hallmark · pre-emit critique: P5 H5 E4 S5 R4 V5 */
/* Hallmark · genre: playful · macrostructure: Narrative Workflow · tone: playful education · theme: Plume · anchor hue: indigo · enrichment: E5 Tier-B hand-SVG loop dominant · nav: N7 · footer: Ft8 · H9 knobs: Tier-B/loop/dominant · F4 knobs: 1.0/vertical/line · contrast: pass (46–50) · slop: pass (51–60) · mobile: pass (36, 59, 61–69) */

* { box-sizing: border-box; }
html, body { margin: 0; overflow-x: clip; scroll-behavior: smooth; }
body { background: var(--color-paper); color: var(--color-ink); font-family: var(--font-body); font-size: var(--text-body); line-height: 1.65; }
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; color: inherit; }
.skip-link { position: fixed; top: var(--space-sm); left: var(--space-sm); z-index: 100; padding: var(--space-sm) var(--space-md); background: var(--color-ink); color: var(--color-white); transform: translateY(-160%); transition: transform var(--dur-fast) var(--ease-out); }
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: var(--rule-bold) solid var(--color-focus); outline-offset: var(--space-2xs); }

.nav-slab { min-height: 76px; display: flex; align-items: center; gap: var(--space-xl); padding: var(--space-sm) clamp(var(--space-md), 4vw, var(--space-2xl)); border-bottom: var(--rule-bold) solid var(--color-rule); background: var(--color-paper); position: relative; z-index: 20; }
.brand { display: flex; align-items: center; gap: var(--space-sm); min-height: 48px; font-family: var(--font-display); font-size: 1.55rem; font-weight: 800; letter-spacing: -0.04em; }
.brand small { font-family: var(--font-mono); font-size: 0.58rem; letter-spacing: 0.12em; }
.brand-mark { width: 36px; height: 36px; border: var(--rule-bold) solid var(--color-ink); border-radius: 50%; display: flex; align-items: center; justify-content: center; gap: var(--space-2xs); background: var(--color-sun); }
.brand-mark i { width: 3px; height: 13px; background: var(--color-ink); border-radius: var(--radius-pill); }
.brand-mark i:nth-child(2) { height: 21px; }
.slab-nav { margin-left: auto; display: flex; align-items: center; gap: clamp(var(--space-md), 2.5vw, var(--space-xl)); font-family: var(--font-display); font-size: var(--text-sm); font-weight: 800; letter-spacing: 0.06em; }
.slab-nav a { min-height: 44px; display: inline-flex; align-items: center; white-space: nowrap; border-bottom: var(--rule-bold) solid transparent; transition: border-color var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out); }
.slab-nav a:hover { border-color: var(--color-coral); transform: translateY(-2px); }
.slab-nav a:active { transform: translateY(0); }
.nav-login { padding-inline: var(--space-md); background: var(--color-ink); color: var(--color-white); border: var(--rule-bold) solid var(--color-ink) !important; }
.nav-login:hover { background: var(--color-accent-strong); }
.menu-toggle { display: none; margin-left: auto; min-width: 64px; min-height: 44px; border: var(--rule-bold) solid var(--color-ink); background: var(--color-paper); font-weight: 700; }

.hero { min-height: calc(100svh - 76px); display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr); align-items: center; gap: clamp(var(--space-xl), 5vw, var(--space-4xl)); padding: clamp(var(--space-2xl), 7vw, var(--space-4xl)) clamp(var(--space-md), 6vw, var(--space-4xl)) clamp(var(--space-3xl), 9.5vw, 10rem); border-bottom: var(--rule-bold) solid var(--color-rule); }
.hero-copy { min-width: 0; }
.hero-note, .section-head > p, .final-cta > div > p { margin: 0 0 var(--space-lg); font-family: var(--font-body); font-size: var(--text-xs); font-weight: 700; letter-spacing: .08em; }
.hero-note { font-family: var(--font-mono); }
.hero-note { display: inline-flex; align-items: center; min-height: 36px; padding-inline: var(--space-md); border: var(--rule-bold) solid var(--color-ink); border-radius: var(--radius-pill); background: var(--color-mint); }
.hero h1 { margin: 0; max-width: 9ch; font-family: var(--font-display); font-size: var(--text-display-s); font-weight: 800; letter-spacing: -0.065em; line-height: .98; overflow-wrap: anywhere; min-width: 0; }
.hero h1 span { color: var(--color-accent); }
.hero-lede { max-width: 50ch; margin: var(--space-xl) 0 0; color: var(--color-ink-soft); overflow-wrap: anywhere; }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-sm); margin-top: var(--space-xl); }
.action { display: inline-flex; align-items: center; justify-content: center; min-height: 52px; padding: var(--space-sm) var(--space-lg); border: var(--rule-bold) solid var(--color-ink); font-family: var(--font-display); font-weight: 800; white-space: nowrap; transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out); }
.action:hover { transform: translateY(-3px); box-shadow: 5px 5px 0 var(--color-ink); }
.action:active { transform: translate(2px, 2px); box-shadow: 2px 2px 0 var(--color-ink); }
.action-primary { background: var(--color-coral); }
.action-primary:hover { background: var(--color-sun); }
.action-secondary { background: transparent; }
.action-secondary:hover { background: var(--color-paper-2); }
.action[aria-disabled="true"], .slab-nav a[aria-disabled="true"], .audience a[aria-disabled="true"] { opacity: .55; cursor: not-allowed; pointer-events: none; }
.menu-toggle:disabled { opacity: .55; cursor: not-allowed; }
.learn-link { display: inline-flex; align-items: center; gap: var(--space-sm); min-height: 44px; margin-top: var(--space-md); color: var(--color-ink-soft); font-size: var(--text-sm); border-bottom: var(--rule-thin) solid transparent; }
.learn-link:hover { color: var(--color-ink); border-color: var(--color-ink); }

.hero-art { position: relative; min-width: 0; }
.hero-art svg { display: block; width: 100%; max-height: 620px; overflow: visible; }
.orbit { fill: none; stroke: var(--color-ink); stroke-width: 2; stroke-dasharray: 7 12; }
.orbit-two { stroke: var(--color-coral); stroke-width: 6; stroke-dasharray: 1 17; stroke-linecap: round; }
.core-ring { fill: var(--color-paper-2); stroke: var(--color-ink); stroke-width: 2; }
.core { fill: var(--color-accent); stroke: var(--color-ink); stroke-width: 4; }
.play { fill: var(--color-white); }
.wave path { fill: none; stroke: var(--color-ink); stroke-width: 7; stroke-linecap: round; }
.art-card rect { stroke: var(--color-ink); stroke-width: 3; }
.card-text rect { fill: var(--color-sun); }
.card-quiz rect { fill: var(--color-mint); }
.art-card path { fill: none; stroke: var(--color-ink); stroke-width: 5; stroke-linecap: round; }
.art-card circle { fill: var(--color-coral); stroke: var(--color-ink); stroke-width: 3; }
.spark { fill: none; stroke: var(--color-ink); stroke-width: 7; stroke-linecap: round; }
.dot-a { fill: var(--color-coral); stroke: var(--color-ink); stroke-width: 3; }
.dot-b { fill: var(--color-sun); stroke: var(--color-ink); stroke-width: 3; }
.sound-core { transform-origin: 304px 279px; animation: breathe 3.6s var(--ease-in-out) infinite alternate; }
.card-text { transform-origin: center; animation: float-a 5s var(--ease-in-out) infinite alternate; }
.card-quiz { transform-origin: center; animation: float-b 4.2s var(--ease-in-out) infinite alternate; }
.art-caption { position: absolute; right: 3%; bottom: 4%; margin: 0; padding: var(--space-sm) var(--space-md); border: var(--rule-bold) solid var(--color-ink); background: var(--color-paper); box-shadow: 5px 5px 0 var(--color-ink); font-size: var(--text-sm); }
.art-caption strong, .art-caption span { display: block; }
.art-caption span { color: var(--color-ink-soft); font-size: var(--text-xs); }

.section-shell { padding: var(--space-4xl) clamp(var(--space-md), 6vw, var(--space-4xl)); }
.section-head { padding-bottom: var(--space-3xl); }
.section-head > p { color: var(--color-accent-strong); }
.section-head h2, .final-cta h2 { max-width: 14ch; margin: 0; font-family: var(--font-display); font-size: var(--text-xl); line-height: 1.08; letter-spacing: -.045em; overflow-wrap: anywhere; }
.workflow { background: var(--color-paper-2); border-bottom: var(--rule-bold) solid var(--color-rule); }
.steps { list-style: none; margin: 0; padding: 0; border-top: var(--rule-bold) solid var(--color-rule); }
.step { display: grid; grid-template-columns: minmax(72px, .35fr) minmax(0, 1.15fr) minmax(220px, .8fr); gap: clamp(var(--space-md), 3vw, var(--space-2xl)); align-items: center; min-height: 250px; padding: var(--space-2xl) 0; border-bottom: var(--rule-bold) solid var(--color-rule); }
.stage { align-self: start; font-family: var(--font-display); font-size: var(--text-lg); font-weight: 800; }
.step-copy h3 { margin: 0 0 var(--space-sm); font-family: var(--font-display); font-size: var(--text-lg); line-height: 1.1; }
.step-copy p { max-width: 48ch; margin: 0; color: var(--color-ink-soft); }
.step-visual { min-height: 138px; border: var(--rule-bold) solid var(--color-ink); padding: var(--space-lg); background: var(--color-paper); box-shadow: 6px 6px 0 var(--color-ink); transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out); }
.step:hover .step-visual { transform: translateY(-4px); box-shadow: 9px 9px 0 var(--color-ink); }
.visual-prompt { display: flex; flex-direction: column; justify-content: space-between; background: var(--color-paper-3); font-family: var(--font-mono); font-size: var(--text-sm); }
.visual-prompt i { height: 42px; border: var(--rule-bold) solid var(--color-ink); background: var(--color-coral); }
.visual-edit { position: relative; display: grid; grid-template-columns: 50px 1fr; gap: var(--space-sm); align-content: center; background: var(--color-paper); }
.visual-edit b { grid-row: span 3; display: grid; place-items: center; border: var(--rule-bold) solid var(--color-ink); background: var(--color-accent); color: var(--color-accent-ink); }
.visual-edit span { height: 11px; align-self: center; background: var(--color-paper-2); border: var(--rule-thin) solid var(--color-ink); }
.visual-edit span:nth-of-type(2) { width: 78%; }
.visual-edit span:nth-of-type(3) { width: 55%; }
.visual-listen { display: flex; align-items: center; justify-content: center; gap: var(--space-xs); background: var(--color-mint); }
.visual-listen button { width: 48px; height: 48px; border: var(--rule-bold) solid var(--color-ink); border-radius: 50%; background: var(--color-paper); }
.visual-listen span { width: 6px; height: 24px; background: var(--color-ink); border-radius: var(--radius-pill); }
.visual-listen span:nth-of-type(2), .visual-listen span:nth-of-type(4) { height: 48px; }
.visual-listen span:nth-of-type(3) { height: 64px; }
.visual-result { display: flex; align-items: center; gap: var(--space-md); background: var(--color-sun); }
.visual-result strong { display: grid; place-items: center; width: 58px; height: 58px; flex: 0 0 auto; border: var(--rule-bold) solid var(--color-ink); border-radius: 50%; background: var(--color-mint); font-size: var(--text-xl); }
.visual-result span { font-weight: 700; }

.dual { border-bottom: var(--rule-bold) solid var(--color-rule); }
.dual-head { display: grid; grid-template-columns: minmax(0, 1fr); gap: 0; }
.dual-head h2 { max-width: 13ch; }
.dual-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border: var(--rule-bold) solid var(--color-ink); }
.audience { padding: clamp(var(--space-xl), 5vw, var(--space-3xl)); }
.audience + .audience { border-left: var(--rule-bold) solid var(--color-ink); }
.teacher-card { background: var(--color-paper-3); }
.student-card { background: var(--color-mint); }
.audience-symbol { width: 70px; height: 70px; display: grid; place-items: center; border: var(--rule-bold) solid var(--color-ink); border-radius: 50%; background: var(--color-paper); font-family: var(--font-display); font-size: var(--text-xl); font-weight: 800; }
.audience h3 { margin: var(--space-lg) 0 var(--space-sm); font-family: var(--font-display); font-size: var(--text-xl); line-height: 1; }
.audience p { max-width: 46ch; color: var(--color-ink-soft); }
.audience ul { margin: var(--space-xl) 0; padding: 0; list-style: none; }
.audience li { padding: var(--space-sm) 0; border-bottom: var(--rule-thin) solid var(--color-ink); }
.audience li::before { content: "＋"; margin-right: var(--space-sm); font-weight: 700; }
.audience a { min-height: 44px; display: inline-flex; align-items: center; gap: var(--space-xs); font-weight: 700; border-bottom: var(--rule-bold) solid var(--color-ink); transition: gap var(--dur-fast) var(--ease-out); white-space: nowrap; }
.audience a:hover { gap: var(--space-md); }

.final-cta { display: flex; align-items: end; justify-content: space-between; gap: var(--space-2xl); padding: var(--space-4xl) clamp(var(--space-md), 6vw, var(--space-4xl)); background: var(--color-ink); color: var(--color-white); }
.final-cta h2 { max-width: 11ch; font-size: var(--text-display-s); }
.final-actions { display: flex; flex-direction: column; align-items: flex-start; gap: var(--space-md); }
.final-cta .action { color: var(--color-ink); }
.text-action { min-height: 44px; display: inline-flex; align-items: center; white-space: nowrap; border-bottom: var(--rule-thin) solid var(--color-white); }

.foot-marquee { overflow: hidden; background: var(--color-sun); }
.foot-marquee-track { display: flex; width: max-content; white-space: nowrap; padding-block: var(--space-md); border-bottom: var(--rule-bold) solid var(--color-ink); animation: marquee 32s linear infinite; }
.foot-marquee-track span { padding-right: var(--space-xl); font-family: var(--font-display); font-size: var(--text-lg); font-weight: 800; letter-spacing: .02em; }
.footer-meta { display: flex; justify-content: space-between; gap: var(--space-md); padding: var(--space-xl) clamp(var(--space-md), 6vw, var(--space-4xl)); font-size: var(--text-sm); }
.footer-meta p { margin: 0; }
.footer-meta a { min-height: 44px; display: inline-flex; align-items: center; border-bottom: var(--rule-thin) solid transparent; white-space: nowrap; }
.footer-meta a:hover { border-color: var(--color-ink); }

@keyframes breathe { to { transform: scale(1.025); } }
@keyframes float-a { to { transform: translate(8px, -10px) rotate(-1.5deg); } }
@keyframes float-b { to { transform: translate(-7px, 9px) rotate(1deg); } }
@keyframes marquee { to { transform: translateX(-25%); } }

@media (max-width: 60rem) {
  .hero { grid-template-columns: minmax(0, 1fr); padding-top: var(--space-3xl); }
  .hero-copy { max-width: 760px; }
  .hero-art { width: min(660px, 82vw); margin-inline: auto; }
  .step { grid-template-columns: 72px minmax(0, 1fr); }
  .step-visual { grid-column: 2; }
  .final-cta { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 48rem) {
  .nav-slab { flex-wrap: wrap; }
  .brand small { display: none; }
  .menu-toggle { display: block; }
  .slab-nav { width: 100%; display: none; flex-direction: column; align-items: stretch; gap: 0; padding-bottom: var(--space-sm); }
  .slab-nav.is-open { display: flex; }
  .slab-nav a { justify-content: center; border-top: var(--rule-thin) solid var(--color-ink); border-bottom: 0; }
  .nav-login { margin-top: var(--space-sm); }
  .section-shell { padding-block: var(--space-3xl); }
  .dual-head { grid-template-columns: minmax(0, 1fr); }
  .dual-grid { grid-template-columns: minmax(0, 1fr); }
  .audience + .audience { border-left: 0; border-top: var(--rule-bold) solid var(--color-ink); }
}

@media (max-width: 40rem) {
  .hero { min-height: auto; padding-block: var(--space-2xl) var(--space-3xl); }
  .hero h1 { font-size: clamp(2.7rem, 14vw, 4.6rem); }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .action { width: 100%; }
  .hero-art { width: 100%; }
  .art-caption { right: 0; bottom: -2%; }
  .section-head { padding-bottom: var(--space-2xl); }
  .step { grid-template-columns: minmax(0, 1fr); gap: var(--space-md); min-height: 0; padding-block: var(--space-xl); }
  .stage { font-size: var(--text-sm); }
  .step-visual { grid-column: 1; }
  .audience { padding: var(--space-xl); }
  .audience-symbol { width: 56px; height: 56px; }
  .final-cta { padding-block: var(--space-3xl); }
  .final-cta h2 { font-size: clamp(2.7rem, 14vw, 4.6rem); }
  .final-actions { width: 100%; }
  .footer-meta { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}