:root {
  --background: #FAF5FF;
  --foreground: #4C1D95;
  --card: #FFFFFF;
  --border: #DDD6FE;
  --accent: #EC4899;
  --primary: #7C3AED;
  --secondary: #A78BFA;
  --muted: #ECEEF9;
  --ink: #231942;
  --sun: #FFD166;
  --cyan: #BFF6F2;
  --orange: #FFB15C;
  --mint: #C8F3DD;
  --shadow: 0 18px 40px rgba(76, 29, 149, 0.12);
  --radius: 18px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--background);
  color: var(--foreground);
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
}
a { color: inherit; }
button, a { min-width: 44px; min-height: 44px; }
button, a { -webkit-tap-highlight-color: transparent; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
section[id], #main-content { scroll-margin-top: 96px; }

.skip-link { position: fixed; left: 16px; top: 12px; z-index: 100; padding: 10px 14px; background: var(--ink); color: white; opacity: 0; pointer-events: none; transition: opacity 200ms ease; }
.skip-link:focus { opacity: 1; pointer-events: auto; }
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(250, 245, 255, 0.92); border-bottom: 1px solid var(--border); backdrop-filter: blur(12px); }
.nav-shell { position: relative; width: min(1180px, calc(100% - 40px)); min-height: 72px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand, .footer-brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-family: "JetBrains Mono", ui-monospace, monospace; font-weight: 700; letter-spacing: 0; }
.brand-mark { display: inline-grid; place-items: center; width: 32px; height: 32px; border-radius: 9px; background: var(--primary); color: white; font-family: "JetBrains Mono", ui-monospace, monospace; }
.nav-links { display: flex; align-items: center; gap: 22px; font-size: 0.92rem; }
.nav-links a { text-decoration: none; font-weight: 600; }
.nav-links a:hover { color: var(--accent); }
.nav-cta { padding: 10px 14px; background: var(--primary); color: white; border: 2px solid var(--foreground); box-shadow: 5px 5px 0 var(--foreground); }
.menu-toggle { position: absolute; top: 14px; right: 0; display: inline-flex; min-width: 44px; min-height: 44px; border: 2px solid var(--foreground); background: var(--card); color: var(--foreground); font: 600 0.86rem "JetBrains Mono", ui-monospace, monospace; opacity: 0; pointer-events: none; }

.page-section { width: min(1180px, calc(100% - 40px)); margin: 0 auto; padding-block: 72px; }
.eyebrow, .feature-number, .panel-tag, .board-label, .toolbar-label, .contact-label { margin: 0 0 12px; color: var(--accent); font: 600 0.76rem "JetBrains Mono", ui-monospace, monospace; letter-spacing: 0.05em; text-transform: uppercase; }
h1, h2, h3 { margin: 0; color: var(--foreground); font-family: "JetBrains Mono", ui-monospace, monospace; letter-spacing: 0; line-height: 1.08; }
h1 { font-size: clamp(3rem, 4.8vw, 4.5rem); max-width: 850px; }
h1 em { color: var(--accent); font-style: normal; }
h2 { font-size: clamp(2rem, 4vw, 3.5rem); max-width: 730px; }
h3 { font-size: 1.35rem; }
p { max-width: 68ch; }

.hero-section { min-height: auto; display: grid; grid-template-columns: minmax(0, 1.03fr) minmax(340px, 0.97fr); gap: 56px; align-items: center; padding-block: 36px; }
.hero-summary { margin: 18px 0 0; max-width: 560px; font-size: 1.15rem; color: #5b4a84; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 14px 18px; margin-top: 22px; }
.button, .text-button { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; gap: 10px; border: 0; font: 600 0.9rem "JetBrains Mono", ui-monospace, monospace; text-decoration: none; cursor: pointer; transition: color 240ms ease, background-color 240ms ease, transform 200ms ease; }
.button { padding: 13px 18px; }
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--primary); color: white; border: 2px solid var(--foreground); box-shadow: 5px 5px 0 var(--foreground); }
.button-dark { background: var(--ink); color: white; border: 2px solid var(--ink); }
.button-small { min-height: 40px; padding: 8px 12px; background: var(--accent); color: #000; border: 1px solid #000; font-size: 0.73rem; }
.button-ghost { background: transparent; color: var(--foreground); border-color: var(--border); }
.text-link, .text-button { color: var(--foreground); }
.text-link { display: inline-flex; align-items: center; font-weight: 700; text-decoration-thickness: 2px; text-underline-offset: 5px; }
.text-button { padding: 6px 0; background: transparent; text-decoration: underline; text-underline-offset: 4px; }
.hero-notes { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-top: 28px; color: #6a5a8c; font: 0.72rem "JetBrains Mono", ui-monospace, monospace; }
.hero-notes strong { color: var(--primary); }
.hero-next-hint { display: inline-flex; align-items: center; gap: 8px; min-width: 44px; min-height: 44px; margin-top: 18px; color: var(--foreground); font: 600 0.72rem "JetBrains Mono", ui-monospace, monospace; text-decoration: none; text-underline-offset: 4px; }
.hero-next-hint:hover { text-decoration: underline; }
.hero-next-hint span:first-child { display: inline-grid; place-items: center; width: 24px; height: 24px; background: var(--sun); border: 1px solid var(--foreground); font-size: 0.65rem; }
.hero-art { position: relative; min-height: 420px; isolation: isolate; overflow: hidden; }
.orbit { position: absolute; border: 1px solid var(--secondary); border-radius: 50%; transform: rotate(-14deg); }
.orbit-one { inset: 20px 2px 64px 12px; }
.orbit-two { inset: 80px 80px 4px 54px; border-color: var(--accent); }
.hero-card { position: absolute; display: flex; flex-direction: column; justify-content: space-between; width: min(62%, 300px); aspect-ratio: 0.77; padding: 18px; border: 2px solid var(--foreground); box-shadow: var(--shadow); }
.hero-card span { font: 0.7rem "JetBrains Mono", ui-monospace, monospace; }
.hero-card b { font: 700 2.2rem "JetBrains Mono", ui-monospace, monospace; }
.hero-card i { display: block; width: 100%; height: 42%; background: repeating-linear-gradient(135deg, rgba(76,29,149,.16) 0 10px, transparent 10px 20px); }
.hero-card-reference { top: 50px; left: 34px; background: var(--cyan); transform: rotate(-7deg); }
.hero-card-recreation { right: 10px; bottom: 20px; background: var(--orange); transform: rotate(8deg); }
.hero-stamp { position: absolute; left: 45%; top: 43%; display: grid; place-items: center; width: 100px; height: 100px; border-radius: 50%; background: var(--accent); color: #000; text-align: center; font: 700 0.72rem "JetBrains Mono", ui-monospace, monospace; transform: rotate(13deg); }
.hero-stamp strong { font-size: 1.3rem; }

.demo-section { width: 100%; max-width: none; padding-block: 48px; padding-inline: max(20px, calc((100% - 1180px) / 2)); background: #efe7ff; }
.section-intro { width: min(1180px, 100%); margin: 0 auto 32px; display: grid; grid-template-columns: 1fr 0.75fr; gap: 40px; align-items: end; }
.section-intro p:last-child { margin: 0; color: #5b4a84; }
.demo-wrap { width: min(1180px, 100%); margin: 0 auto; background: var(--card); border: 2px solid var(--foreground); box-shadow: var(--shadow); }
.demo-toolbar, .demo-caption { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 14px 18px; }
.demo-toolbar { border-bottom: 1px solid var(--border); }
.toolbar-label { margin: 0; color: var(--foreground); }
.status-dot { display: inline-block; width: 9px; height: 9px; margin-right: 8px; border-radius: 50%; background: #16a34a; }
.demo-controls { display: flex; gap: 8px; }
.demo-stage { display: grid; grid-template-columns: 1fr 60px 1fr; align-items: stretch; min-height: 360px; background: var(--muted); overflow: hidden; }
.demo-panel { display: flex; flex-direction: column; justify-content: space-between; min-width: 0; padding: 30px; }
.panel-reference { background: var(--cyan); }
.panel-recreation { background: var(--orange); }
.panel-geometry { display: grid; place-items: center; min-height: 190px; border: 2px solid var(--foreground); background: rgba(255,255,255,.46); }
.panel-geometry b { font: 700 clamp(4rem, 8vw, 7rem) "JetBrains Mono", ui-monospace, monospace; }
.panel-geometry span { font: 0.7rem "JetBrains Mono", ui-monospace, monospace; }
.demo-panel p { margin: 16px 0 0; font-weight: 600; }
.match-marker { display: grid; place-items: center; align-content: center; gap: 12px; background: var(--accent); color: #000; font: 700 0.72rem "JetBrains Mono", ui-monospace, monospace; }
.match-marker span { font-size: 2rem; }
.demo-caption { color: #5b4a84; font-size: 0.9rem; }
.demo-caption .text-button { font-size: 0.75rem; }
.demo-stage.is-alternate .panel-reference { background: var(--orange); }
.demo-stage.is-alternate .panel-recreation { background: var(--cyan); }
.demo-stage.is-playing .match-marker { animation: pulse-marker 900ms ease-in-out infinite alternate; }

.feature-section { background: var(--background); }
.section-heading-row { display: grid; grid-template-columns: 1fr 0.62fr; gap: 40px; align-items: end; margin-bottom: 34px; }
.section-aside { margin: 0; color: #5b4a84; }
.feature-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.feature-card { position: relative; min-height: 340px; padding: 24px; border: 2px solid var(--foreground); background: var(--card); box-shadow: 8px 8px 0 var(--border); overflow: hidden; transition: color 240ms ease, background-color 240ms ease; }
.feature-card:hover { background: var(--foreground); color: white; }
.feature-card:hover h3, .feature-card:hover p, .feature-card:hover .feature-number { color: white; }
.feature-card p { color: #5b4a84; }
.feature-card:hover p { color: #f5edff; }
.feature-number { color: var(--foreground); }
.feature-icon { position: absolute; right: 22px; bottom: 18px; font: 700 3rem "JetBrains Mono", ui-monospace, monospace; color: var(--accent); }
.card-cyan { background: var(--cyan); }.card-orange { background: var(--orange); }.card-violet { background: #e7d9ff; }.card-mint { background: var(--mint); }

.library-section { display: grid; grid-template-columns: 0.2fr 0.85fr 1fr; gap: 42px; align-items: center; background: var(--card); border-top: 16px solid var(--foreground); }
.library-index { display: grid; gap: 10px; align-content: center; min-height: 250px; padding: 18px; background: var(--sun); border: 2px solid var(--foreground); font-family: "JetBrains Mono", ui-monospace, monospace; }
.library-index span { writing-mode: vertical-rl; transform: rotate(180deg); font-size: 0.72rem; }
.library-index strong { font-size: 2.8rem; }.library-index i { display: block; width: 14px; height: 14px; background: var(--accent); }
.library-copy p:not(.eyebrow) { color: #5b4a84; }
.contact-sheet { display: grid; grid-template-columns: 1.2fr 0.8fr 0.8fr; grid-template-rows: 1fr 1fr; gap: 10px; min-height: 300px; position: relative; }
.sheet-cell { display: grid; place-items: center; border: 2px solid var(--foreground); font: 700 3.2rem "JetBrains Mono", ui-monospace, monospace; color: var(--foreground); }.sheet-cell-large { grid-row: 1 / span 2; background: var(--cyan); }.sheet-cell-orange { background: var(--orange); }.sheet-cell-cyan { background: var(--mint); }.sheet-cell-small { background: var(--muted); }.sheet-cell-violet { background: #e7d9ff; }.sheet-label { position: absolute; right: 12px; bottom: 12px; padding: 4px 8px; background: var(--foreground); color: white; font: 0.68rem "JetBrains Mono", ui-monospace, monospace; }

.comparison-section { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 70px; align-items: center; padding-inline: clamp(14px, 3vw, 32px); background: var(--cyan); }
.comparison-copy p:not(.eyebrow) { color: #4d4972; }.check-list { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 12px; font-weight: 600; }.check-list li { display: flex; gap: 10px; align-items: center; }.check-list span { display: inline-grid; place-items: center; flex: 0 0 22px; width: 22px; height: 22px; color: var(--accent); font: 700 1.1rem/1 "JetBrains Mono", ui-monospace, monospace; }
.comparison-board { display: grid; grid-template-columns: 1fr 56px 1fr; min-height: 300px; border: 2px solid var(--foreground); background: var(--card); box-shadow: var(--shadow); }.board-column { display: flex; flex-direction: column; justify-content: center; padding: 28px; }.board-source { background: var(--muted); }.board-result { background: #e7d9ff; }.board-column strong { font: 700 2.2rem "JetBrains Mono", ui-monospace, monospace; }.board-column p { margin: 18px 0 0; line-height: 1.85; color: #5b4a84; }.board-divider { display: grid; place-items: center; background: var(--accent); color: #000; font: 700 0.72rem "JetBrains Mono", ui-monospace, monospace; }

.cta-section { width: 100%; max-width: none; padding-inline: max(20px, calc((100% - 1180px) / 2)); background: var(--primary); }.cta-panel { width: min(1180px, 100%); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 30px; padding: 44px 48px; border: 2px solid var(--foreground); background: var(--sun); box-shadow: 10px 10px 0 var(--foreground); }.cta-panel h2 { max-width: 640px; }.cta-panel p:not(.eyebrow) { margin-bottom: 0; color: #5b4a84; }

.support-section { display: grid; grid-template-columns: 0.75fr 1.25fr; gap: 50px; align-items: start; background: var(--background); }.support-heading p:not(.eyebrow) { color: #5b4a84; }.faq-grid { display: grid; gap: 10px; }.faq-grid details { border: 2px solid var(--border); background: var(--card); }.faq-grid summary { min-height: 52px; padding: 14px 18px; cursor: pointer; list-style: none; font-weight: 700; }.faq-grid summary::-webkit-details-marker { display: none; }.faq-grid summary::after { content: "+"; float: right; color: var(--accent); font: 700 1.2rem "JetBrains Mono", ui-monospace, monospace; }.faq-grid details[open] summary::after { content: "-"; }.faq-grid details p { margin: 0; padding: 0 18px 16px; color: #5b4a84; }.support-contact { grid-column: 1 / -1; display: flex; flex-wrap: wrap; align-items: baseline; gap: 12px; padding-top: 24px; border-top: 2px solid var(--foreground); font-family: "JetBrains Mono", ui-monospace, monospace; }.contact-label { margin: 0; color: var(--foreground); }.contact-note { color: #6a5a8c; font: 0.78rem "IBM Plex Sans", system-ui, sans-serif; }
.legal-section { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 40px; padding-inline: clamp(14px, 3vw, 32px); background: var(--ink); color: white; }.legal-section h2 { color: white; }.legal-section p:not(.eyebrow) { color: #dfd3f5; }.legal-links { display: grid; min-width: 250px; border: 1px solid #b6a6da; }.legal-links a { display: flex; justify-content: space-between; gap: 18px; padding: 15px 18px; color: white; text-decoration: none; font: 600 0.85rem "JetBrains Mono", ui-monospace, monospace; }.legal-links a + a { border-top: 1px solid #b6a6da; }.legal-links a:hover { background: var(--accent); color: #000; }
.site-footer { width: min(1180px, calc(100% - 40px)); margin: 0 auto; min-height: 92px; display: flex; align-items: center; justify-content: space-between; gap: 20px; color: #6a5a8c; font-size: 0.82rem; }.site-footer p { margin: 0; }.site-footer a { text-underline-offset: 4px; }

.pattern-tile { animation: rise-in 240ms ease both; }.card-link { transition: color 240ms ease, background-color 240ms ease; }.compare-track { scroll-snap-type: x mandatory; overflow-x: auto; }.compare-track > * { scroll-snap-align: start; }
@keyframes rise-in { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
@keyframes pulse-marker { from { transform: scale(1); } to { transform: scale(1.08); } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; transition-duration: 0.001ms !important; } }

@media (min-width: 901px) and (max-width: 1100px) {
  .hero-section { padding-block: 36px; gap: 34px; }
  .hero-art { min-height: 360px; }
}

@media (max-width: 900px) {
  .nav-shell { width: min(100% - 28px, 1180px); }.menu-toggle { position: static; display: inline-flex; align-items: center; justify-content: center; opacity: 1; pointer-events: auto; }.nav-links { position: absolute; top: 72px; left: 14px; right: 14px; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 8px; background: var(--card); border: 2px solid var(--foreground); box-shadow: var(--shadow); }.nav-links.is-open { display: flex; }.nav-links a { min-height: 48px; display: flex; align-items: center; padding: 10px 12px; }.nav-cta { box-shadow: none; margin-top: 6px; justify-content: center; }.page-section { width: min(100% - 28px, 1180px); padding-block: 48px; }.demo-section, .cta-section { padding-inline: 14px; width: 100%; }.hero-section { grid-template-columns: 1fr; gap: 12px; min-height: auto; padding-top: 36px; padding-bottom: 36px; }.hero-art { min-height: 160px; max-width: 560px; width: 100%; margin-inline: auto; }.section-intro, .section-heading-row, .comparison-section, .support-section { grid-template-columns: 1fr; gap: 24px; }.feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }.library-section { grid-template-columns: 72px 1fr; gap: 22px; }.contact-sheet { grid-column: 1 / -1; }.cta-panel { padding: 32px 24px; flex-direction: column; align-items: flex-start; }.support-contact { grid-column: auto; }.legal-section { grid-template-columns: 1fr; }.legal-links { width: 100%; }.site-footer { width: min(100% - 28px, 1180px); flex-wrap: wrap; padding-block: 22px; }
}
@media (max-width: 620px) {
  h1 { font-size: clamp(2.35rem, 12vw, 3.2rem); }.hero-summary { font-size: 1rem; }.hero-section { padding-top: 24px; padding-bottom: 24px; }.hero-art { display: none; }.hero-notes { display: grid; gap: 5px; margin-top: 24px; }.demo-section { padding-top: 0; }.demo-section .eyebrow { margin-bottom: 4px; }.demo-toolbar, .demo-caption { align-items: flex-start; flex-direction: column; }.demo-stage { grid-template-columns: 1fr; min-height: 0; }.demo-panel { min-height: 250px; padding: 22px; }.match-marker { min-height: 58px; display: flex; justify-content: center; flex-direction: row; }.match-marker span { font-size: 1.4rem; }.feature-grid { grid-template-columns: 1fr; }.feature-card { min-height: 280px; }.library-section { grid-template-columns: 1fr; }.library-index { grid-template-columns: auto 1fr auto; min-height: 0; align-items: center; }.library-index span { writing-mode: horizontal-tb; transform: none; }.contact-sheet { min-height: 250px; }.comparison-board { grid-template-columns: 1fr; }.board-divider { min-height: 48px; }.board-column { min-height: 190px; }.support-contact { align-items: flex-start; flex-direction: column; gap: 6px; }.site-footer { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 900px) and (max-height: 500px) {
  .hero-section { padding-block: 8px; gap: 0; }
  .hero-art, .hero-notes { display: none; }
  h1 { font-size: 2rem; }
  .hero-summary { margin-top: 8px; font-size: 0.9rem; }
  .hero-actions { margin-top: 8px; gap: 8px 12px; }
  .hero-next-hint { margin-top: 6px; }
  .demo-section { padding-top: 0; }
  .demo-section .eyebrow { margin-bottom: 4px; }
}

/* Keep every keyboard and touch target measurable after responsive overrides. */
a, button, summary, .button-small { min-width: 44px; min-height: 44px; }
.button, .text-link, .text-button { min-width: 44px; min-height: 44px; }
.hero-copy .hero-next-hint { min-width: 44px; min-height: 44px; }