/* ============================================================
   BioR-GPT — full site
   Code-lab layout (B) + Lab Aurora palette/fonts (A)
   Light & dark themes via [data-theme]
   ============================================================ */

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

:root {
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --code-panel: #0c1120;
  --line: rgba(255,255,255,0.09);
  --radius: 14px;
}

/* ---- DARK (default) ---- */
[data-theme='dark'] {
  --bg: #070b16;
  --ink: #eaf1fb;
  --muted: #9aa6bf;
  --teal: #2dd4bf;
  --cyan: #22d3ee;
  --violet: #a78bfa;
  --amber: #fbbf24;
  --glass-bg: rgba(255,255,255,0.045);
  --glass-border: rgba(255,255,255,0.09);
  --nav-bg: rgba(7,11,22,0.7);
  --code-bg: #0c1120;
  --code-ink: #d6e0ee;
  --grid-line: rgba(110,231,244,0.07);
  --scan-line: rgba(110,231,244,0.014);
  --blob-mix: screen;
  --footer-border: rgba(255,255,255,0.08);
}

/* ---- LIGHT ---- */
[data-theme='light'] {
  --bg: #f4f7fb;
  --ink: #0d1b2a;
  --muted: #51607a;
  --teal: #0d9488;
  --cyan: #0891b2;
  --violet: #7c3aed;
  --amber: #b45309;
  --glass-bg: rgba(255,255,255,0.7);
  --glass-border: rgba(13,27,42,0.1);
  --nav-bg: rgba(244,247,251,0.78);
  --code-bg: #0c1120;
  --code-ink: #d6e0ee;
  --grid-line: rgba(8,145,178,0.07);
  --scan-line: rgba(8,145,178,0.01);
  --blob-mix: multiply;
  --footer-border: rgba(13,27,42,0.1);
}

html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; text-rendering: optimizeLegibility; scroll-padding-top: 5rem; }
body {
  min-height: 100dvh; line-height: 1.6;
  font-family: 'Satoshi', system-ui, sans-serif;
  color: var(--ink); background: var(--bg);
  position: relative; overflow-x: hidden;
  transition: background 300ms var(--ease-out), color 300ms var(--ease-out);
}
a, button, summary { transition: color var(--transition-interactive), background var(--transition-interactive), border-color var(--transition-interactive), box-shadow var(--transition-interactive), transform var(--transition-interactive), opacity var(--transition-interactive); }
ul[role='list'], ol[role='list'] { list-style: none; }
h1, h2, h3 { text-wrap: balance; line-height: 1.1; }
p, li { text-wrap: pretty; max-width: 72ch; }

.skip-link { position: absolute; left: -999px; top: 0; z-index: 200; background: var(--cyan); color: #042027; padding: 0.6rem 1rem; border-radius: 0 0 8px 0; font-weight: 600; text-decoration: none; }
.skip-link:focus { left: 0; }

/* ============ BACKGROUND LAYERS ============ */
.bg-aurora { position: fixed; inset: 0; z-index: 0; filter: blur(80px); opacity: 0.5; pointer-events: none; }
[data-theme='light'] .bg-aurora { opacity: 0.28; }
.blob { position: absolute; border-radius: 50%; mix-blend-mode: var(--blob-mix); }
.blob-1 { width: 42vw; height: 42vw; left: -8vw; top: -8vw; background: radial-gradient(circle, var(--cyan), transparent 65%); animation: drift1 20s var(--ease-in-out) infinite; }
.blob-2 { width: 38vw; height: 38vw; right: -8vw; top: 6vw; background: radial-gradient(circle, var(--violet), transparent 65%); animation: drift2 24s var(--ease-in-out) infinite; }
.blob-3 { width: 36vw; height: 36vw; left: 24vw; bottom: -12vw; background: radial-gradient(circle, var(--teal), transparent 65%); animation: drift3 28s var(--ease-in-out) infinite; }
@keyframes drift1 { 50% { transform: translate(8vw, 7vh) scale(1.1); } }
@keyframes drift2 { 50% { transform: translate(-7vw, 8vh) scale(1.08); } }
@keyframes drift3 { 50% { transform: translate(6vw, -8vh) scale(1.12); } }
.bg-grid { position: fixed; inset: 0; z-index: 0; opacity: 0.22; pointer-events: none; background-image: linear-gradient(var(--grid-line) 1px, transparent 1px), linear-gradient(90deg, var(--grid-line) 1px, transparent 1px); background-size: 48px 48px; mask-image: radial-gradient(ellipse 80% 70% at 50% 25%, #000 30%, transparent 85%); }
.bg-scan { position: fixed; inset: 0; z-index: 0; pointer-events: none; background: repeating-linear-gradient(180deg, transparent 0, transparent 3px, var(--scan-line) 3px, var(--scan-line) 4px); }

.wrap { position: relative; z-index: 2; max-width: 1180px; margin: 0 auto; padding: 0 1.5rem; }

.glass { background: var(--glass-bg); border: 1px solid var(--glass-border); backdrop-filter: blur(14px); border-radius: var(--radius); }

/* ============ STICKY HEADER ============ */
.topnav { position: sticky; top: 0; z-index: 90; display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 0.9rem 1.5rem; background: var(--nav-bg); backdrop-filter: blur(14px); border-bottom: 1px solid var(--glass-border); }
.logo { display: inline-flex; align-items: center; gap: 0.55rem; color: var(--ink); font-family: 'Cabinet Grotesk', sans-serif; font-weight: 700; font-size: 1.2rem; text-decoration: none; }
.logo svg { width: 26px; height: 26px; color: var(--cyan); }
.navlinks { display: flex; align-items: center; gap: 1.4rem; }
.navlinks a { color: var(--muted); text-decoration: none; font-size: 0.88rem; font-family: 'JetBrains Mono', monospace; }
.navlinks a:hover { color: var(--cyan); }
.cta-mini { padding: 0.5rem 1rem; border-radius: 999px; border: 1px solid rgba(110,231,244,0.35); color: var(--cyan) !important; white-space: nowrap; }
[data-theme='light'] .cta-mini { border-color: rgba(8,145,178,0.4); }
.cta-mini:hover { background: rgba(34,211,238,0.1); }

.theme-toggle { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 999px; border: 1px solid var(--glass-border); color: var(--ink); cursor: pointer; background: var(--glass-bg); }
.theme-toggle:hover { color: var(--cyan); border-color: rgba(110,231,244,0.4); }
.theme-toggle .icon-sun { display: none; }
[data-theme='light'] .theme-toggle .icon-sun { display: block; }
[data-theme='light'] .theme-toggle .icon-moon { display: none; }

/* ============ HERO ============ */
.hero { padding: clamp(2rem, 6vw, 4rem) 0 clamp(2rem, 5vw, 3.5rem); }
.hero__grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 3rem; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 0.5rem; color: var(--cyan); font-family: 'JetBrains Mono', monospace; font-size: 0.8rem; margin-bottom: 1.1rem; flex-wrap: wrap; }
.tag { background: rgba(110,231,244,0.12); border: 1px solid rgba(110,231,244,0.3); padding: 0.1rem 0.45rem; border-radius: 5px; color: var(--cyan); }
.h1 { font-family: 'Cabinet Grotesk', sans-serif; font-weight: 700; font-size: clamp(2.2rem, 1rem + 4.6vw, 3.9rem); letter-spacing: -0.02em; line-height: 1.04; }
.grad { background: linear-gradient(100deg, var(--cyan), var(--violet)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lede { margin-top: 1.2rem; color: var(--muted); font-size: 1.05rem; max-width: 48ch; }
.cta-row { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; margin-top: 1.8rem; }
.cta { display: inline-block; padding: 0.85rem 1.5rem; border-radius: 999px; background: linear-gradient(100deg, var(--cyan), var(--teal)); color: #042027; font-family: 'JetBrains Mono', monospace; font-weight: 700; text-decoration: none; box-shadow: 0 10px 30px rgba(34,211,238,0.25); }
.cta:hover { transform: translateY(-2px); box-shadow: 0 14px 38px rgba(34,211,238,0.35); }
.cta--lg { font-size: 1rem; padding: 1rem 1.8rem; margin-top: 1.6rem; }
.ghost { color: var(--ink); text-decoration: none; font-weight: 600; font-size: 0.95rem; border-bottom: 1px solid var(--glass-border); padding-bottom: 2px; }
.ghost:hover { color: var(--cyan); border-color: var(--cyan); }
.fine { color: var(--muted); font-size: 0.8rem; font-family: 'JetBrains Mono', monospace; }
.fine a { color: var(--cyan); text-decoration: none; }
.fine a:hover { text-decoration: underline; }

/* ============ CODE WINDOW ============ */
.codecard { overflow: hidden; box-shadow: 0 30px 70px rgba(0,0,0,0.55); border-radius: var(--radius); }
.codecard__bar { display: flex; align-items: center; gap: 0.5rem; padding: 0.7rem 1rem; background: rgba(8,12,22,0.7); border-bottom: 1px solid var(--glass-border); }
.dot { width: 11px; height: 11px; border-radius: 50%; flex: none; }
.dot.r { background: #ff5f57; } .dot.y { background: #febc2e; } .dot.g { background: #28c840; }
.codecard__file { margin-left: 0.5rem; color: var(--muted); font-family: 'JetBrains Mono', monospace; font-size: 0.8rem; }
.thinking { margin-left: auto; display: inline-flex; align-items: center; gap: 0.4rem; color: var(--cyan); font-family: 'JetBrains Mono', monospace; font-size: 0.72rem; }
.thinking__pulse { width: 7px; height: 7px; border-radius: 50%; background: var(--cyan); animation: pulse 1.4s infinite; }
@keyframes pulse { 50% { transform: scale(1.6); opacity: 0.4; } }
.code { padding: 1.2rem 1.4rem; font-family: 'JetBrains Mono', monospace; font-size: 0.86rem; line-height: 1.7; color: var(--code-ink); min-height: 230px; white-space: pre-wrap; word-break: break-word; background: var(--code-bg); }
.code .c-com { color: #6b7280; } .code .c-fn { color: var(--teal); } .code .c-str { color: var(--cyan); } .code .c-kw { color: var(--violet); } .code .c-num { color: var(--amber); }
.caret { display: inline; color: var(--cyan); animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.spark { display: flex; align-items: flex-end; gap: 6px; height: 56px; padding: 0 1.4rem 1.1rem; background: var(--code-bg); }
.spark span { flex: 1; background: linear-gradient(var(--teal), rgba(45,212,191,0.15)); border-radius: 3px 3px 0 0; height: var(--h); transform-origin: bottom; animation: bar 1.6s var(--ease-in-out) infinite alternate; }
.spark span:nth-child(2) { animation-delay: 0.15s; } .spark span:nth-child(3) { animation-delay: 0.3s; }
.spark span:nth-child(4) { animation-delay: 0.05s; } .spark span:nth-child(5) { animation-delay: 0.25s; }
.spark span:nth-child(6) { animation-delay: 0.1s; } .spark span:nth-child(7) { animation-delay: 0.35s; } .spark span:nth-child(8) { animation-delay: 0.2s; }
@keyframes bar { from { transform: scaleY(0.4); } to { transform: scaleY(1); } }

/* ============ CREDIBILITY STRIP ============ */
.strip { padding: clamp(1.5rem, 4vw, 2.5rem) 0; border-top: 1px solid var(--glass-border); border-bottom: 1px solid var(--glass-border); margin-bottom: clamp(2rem,5vw,3.5rem); }
.strip__grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 1rem; }
.strip__item { display: flex; flex-direction: column; gap: 0.2rem; }
.strip__item strong { font-family: 'Cabinet Grotesk', sans-serif; font-weight: 700; font-size: clamp(1.1rem, 0.9rem + 0.8vw, 1.5rem); color: var(--cyan); }
[data-theme='light'] .strip__item strong { color: var(--cyan); }
.strip__item span { color: var(--muted); font-size: 0.82rem; font-family: 'JetBrains Mono', monospace; }

/* ============ SECTION HEADS ============ */
.section-head { margin-bottom: 2rem; max-width: 60ch; }
.h2 { font-family: 'Cabinet Grotesk', sans-serif; font-weight: 700; font-size: clamp(1.6rem, 1rem + 2vw, 2.4rem); letter-spacing: -0.015em; line-height: 1.1; }
.section-lede { margin-top: 0.8rem; color: var(--muted); font-size: 1.02rem; }

/* ============ LESSON FLOW ============ */
.lesson { padding: clamp(1rem, 4vw, 2.5rem) 0 clamp(2rem,5vw,3.5rem); }
.lesson__flow { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: start; }
.steps { display: grid; gap: 0.4rem; }
.step { display: grid; grid-template-columns: 3rem 1fr; gap: 1rem; padding: 1rem 0; border-top: 1px solid var(--glass-border); }
.step:first-child { border-top: none; }
.step__num { font-family: 'JetBrains Mono', monospace; color: var(--cyan); font-size: 0.9rem; }
.step h3 { font-family: 'Cabinet Grotesk', sans-serif; font-weight: 600; font-size: 1.05rem; margin-bottom: 0.3rem; }
.step p { color: var(--muted); font-size: 0.92rem; }

.demo { overflow: hidden; box-shadow: 0 24px 60px rgba(0,0,0,0.45); }
.demo__bar { display: flex; align-items: center; gap: 0.5rem; padding: 0.6rem 1rem; background: rgba(8,12,22,0.7); border-bottom: 1px solid var(--glass-border); }
.demo__body { padding: 1.2rem 1.3rem; background: var(--code-bg); }
.demo__prompt, .demo__resp { margin-bottom: 0.9rem; font-size: 0.86rem; color: var(--code-ink); }
.demo__user, .demo__bot { display: inline-block; font-family: 'JetBrains Mono', monospace; font-size: 0.7rem; padding: 0.1rem 0.4rem; border-radius: 4px; margin-right: 0.4rem; vertical-align: middle; }
.demo__user { background: rgba(167,139,250,0.15); color: var(--violet); }
.demo__bot { background: rgba(45,212,191,0.15); color: var(--teal); }
.demo__code { font-family: 'JetBrains Mono', monospace; font-size: 0.8rem; line-height: 1.6; color: var(--code-ink); background: rgba(255,255,255,0.04); padding: 0.8rem; border-radius: 8px; white-space: pre; overflow-x: auto; }
.demo__chart { width: 100%; height: auto; margin: 1rem 0; }

/* ============ CAPABILITIES ============ */
.features { padding: clamp(2rem,5vw,3.5rem) 0; }
.tiles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.tile { padding: 1.5rem; transition: transform var(--transition-interactive), border-color var(--transition-interactive), box-shadow var(--transition-interactive), background var(--transition-interactive); }
.tile:hover { transform: translateY(-4px); border-color: rgba(110,231,244,0.4); background: rgba(255,255,255,0.07); box-shadow: 0 16px 38px rgba(0,0,0,0.4); }
[data-theme='light'] .tile:hover { background: rgba(255,255,255,0.9); }
.tile header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 0.8rem; }
.tile__num { font-family: 'JetBrains Mono', monospace; color: var(--muted); font-size: 0.85rem; }
.tile__chip { font-family: 'JetBrains Mono', monospace; font-size: 0.68rem; color: var(--cyan); background: rgba(110,231,244,0.1); padding: 0.15rem 0.5rem; border-radius: 999px; }
.tile h3 { font-family: 'Cabinet Grotesk', sans-serif; font-weight: 600; font-size: 1.15rem; margin-bottom: 0.5rem; }
.tile p { color: var(--muted); font-size: 0.92rem; }

/* ============ USE CASES ============ */
.usecases { padding: clamp(2rem,5vw,3.5rem) 0; }
.modules { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.module { display: flex; gap: 1rem; align-items: flex-start; padding: 1.3rem; transition: transform var(--transition-interactive), border-color var(--transition-interactive); }
.module:hover { transform: translateY(-3px); border-color: rgba(110,231,244,0.4); }
.module__ico { font-size: 1.5rem; flex: none; }
.module h3 { font-family: 'Cabinet Grotesk', sans-serif; font-weight: 600; font-size: 1.02rem; margin-bottom: 0.25rem; }
.module p { color: var(--muted); font-size: 0.88rem; }

/* ============ PRIVACY ============ */
.privacy { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 2rem; padding: clamp(1.6rem,4vw,2.6rem); margin: clamp(2rem,5vw,3.5rem) 0; }
.privacy__list { display: grid; gap: 0.9rem; }
.privacy__list li { color: var(--muted); font-size: 0.95rem; padding-left: 1.4rem; position: relative; }
.privacy__list li::before { content: '✓'; position: absolute; left: 0; color: var(--teal); font-weight: 700; }
.privacy__list strong { color: var(--ink); }

/* ============ AUTHOR ============ */
.author { margin: clamp(2rem,5vw,3.5rem) 0; padding: clamp(1.6rem,4vw,2.6rem); }
.author__banner { margin: 0 auto 1.8rem; display: flex; flex-direction: column; align-items: center; max-width: 560px; }
.author__banner img { width: 100%; height: auto; display: block; border-radius: 12px; border: 1px solid var(--glass-border); box-shadow: 0 16px 40px rgba(0,0,0,0.35); }
[data-theme='light'] .author__banner img { box-shadow: 0 16px 40px rgba(13,27,42,0.12); }
.author__banner figcaption { margin-top: 0.6rem; color: var(--muted); font-family: 'JetBrains Mono', monospace; font-size: 0.76rem; text-align: center; }
.author__id { display: flex; align-items: center; gap: 1rem; margin-bottom: 1.6rem; }
.author__avatar { width: 64px; height: 64px; border-radius: 16px; display: grid; place-items: center; font-family: 'Cabinet Grotesk', sans-serif; font-weight: 800; font-size: 1.4rem; color: #042027; background: linear-gradient(135deg, var(--cyan), var(--violet)); flex: none; }
.author__name { font-family: 'Cabinet Grotesk', sans-serif; font-weight: 700; font-size: 1.55rem; }
.author__role { color: var(--muted); font-family: 'JetBrains Mono', monospace; font-size: 0.82rem; margin-top: 0.2rem; }
.author__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.author__grid p { color: var(--muted); margin-bottom: 0.9rem; }
.skills { display: flex; flex-wrap: wrap; gap: 0.5rem; align-content: flex-start; }
.skills li { font-family: 'JetBrains Mono', monospace; font-size: 0.78rem; color: var(--cyan); border: 1px solid var(--glass-border); padding: 0.3rem 0.6rem; border-radius: 6px; }
.author__contact { margin-top: 1.4rem; font-family: 'JetBrains Mono', monospace; color: var(--muted); font-size: 0.9rem; }
.author__contact a { color: var(--cyan); text-decoration: none; }
.author__contact a:hover { text-decoration: underline; }

/* ============ FAQ ============ */
.faq { padding: clamp(2rem,5vw,3.5rem) 0; }
.faq__list { display: grid; gap: 0.7rem; max-width: 820px; }
.faq__item { padding: 0.2rem 1.2rem; }
.faq__item summary { cursor: pointer; padding: 0.9rem 0; font-family: 'Cabinet Grotesk', sans-serif; font-weight: 600; font-size: 1.02rem; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::after { content: '+'; color: var(--cyan); font-family: 'JetBrains Mono', monospace; font-size: 1.2rem; flex: none; }
.faq__item[open] summary::after { content: '−'; }
.faq__item p { color: var(--muted); padding: 0 0 1rem; font-size: 0.95rem; }

/* ============ FINAL CTA ============ */
.finalcta { text-align: center; padding: clamp(2.5rem,6vw,4rem) 1.5rem; margin: clamp(2rem,5vw,3.5rem) 0; }
.finalcta .h2 { max-width: 18ch; margin: 0 auto; }
.finalcta__lede { color: var(--muted); margin-top: 0.8rem; }

/* ============ FOOTER ============ */
.footer { border-top: 1px solid var(--footer-border); padding: 2.5rem 0 3rem; margin-top: 2rem; position: relative; z-index: 2; }
.footer__inner { display: flex; flex-direction: column; gap: 0.7rem; }
.footer__brand { display: flex; align-items: center; gap: 0.5rem; color: var(--ink); font-family: 'Cabinet Grotesk', sans-serif; font-weight: 700; font-size: 1.1rem; }
.footer__brand svg { color: var(--cyan); }
.footer__credit { color: var(--muted); font-size: 0.88rem; max-width: 70ch; }
.footer__credit strong { color: var(--ink); }

/* ============ RESPONSIVE ============ */
@media (max-width: 980px) {
  .lesson__flow { grid-template-columns: 1fr; }
  .privacy { grid-template-columns: 1fr; }
}
@media (max-width: 900px) {
  .hero__grid { grid-template-columns: 1fr; gap: 2.4rem; }
  .tiles, .modules { grid-template-columns: repeat(2, 1fr); }
  .author__grid { grid-template-columns: 1fr; }
  .strip__grid { grid-template-columns: repeat(2, 1fr); gap: 1.2rem; }
}
@media (max-width: 680px) {
  .navlinks li:not(.navlinks li:last-child) { display: none; }
}
@media (max-width: 600px) {
  .tiles, .modules { grid-template-columns: 1fr; }
  .navlinks { gap: 0.5rem; }
  .cta-mini { padding: 0.4rem 0.8rem; font-size: 0.78rem; }
  .code, .demo__code { font-size: 0.78rem; }
  .strip__grid { grid-template-columns: 1fr; }
}
@media (hover: none) {
  .tile:hover, .module:hover { transform: none; }
}

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