/* =========================================================================
   Look2Eye — Warm-paper editorial design system
   Ivory paper · ink serif display · terracotta accent · natural-history motif
   ========================================================================= */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600;9..144,700&family=Hanken+Grotesk:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500&family=Noto+Serif+SC:wght@500;600;700&family=Noto+Sans+SC:wght@400;500&display=swap');

:root {
  /* paper & ink */
  --paper: #f4f1ea;
  --paper-2: #ece6d9;
  --card: #faf8f2;
  --card-2: #f0ece1;
  --ink: #23211c;
  --ink-2: #575148;
  --ink-3: #8c8676;
  --line: #ddd6c5;
  --line-2: #cabfa7;

  /* accents */
  --clay: #bd5d3d;
  --clay-dark: #9e4728;
  --clay-soft: #e8cabb;
  --olive: #6d6f43;
  --gold: #b98a3c;

  /* shape */
  --r-sm: 5px;
  --r-md: 9px;
  --r-lg: 16px;
  --maxw: 1120px;
  --header-h: 74px;

  /* type */
  --font-display: 'Fraunces', 'Noto Serif SC', Georgia, 'Songti SC', serif;
  --font-body: 'Hanken Grotesk', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
}

/* subtle paper grain */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
}
body > * { position: relative; z-index: 1; }

::selection { background: var(--clay-soft); color: var(--ink); }

a { color: inherit; }

/* ===== HEADER ===== */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  background: rgba(244, 241, 234, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  z-index: 1000;
  display: flex;
  align-items: center;
}
.header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 40px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo { display: flex; align-items: center; gap: 11px; text-decoration: none; }
.logo img {
  height: 32px; width: 32px; border-radius: 7px; object-fit: cover;
  filter: saturate(0.9);
}
.logo-text {
  font-family: var(--font-display);
  font-size: 1.34rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.nav { display: flex; align-items: center; gap: 34px; }
.nav a {
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--ink-2);
  text-decoration: none;
  transition: color 0.18s;
  position: relative;
  padding: 4px 0;
}
.nav a:hover { color: var(--ink); }
.nav a.active { color: var(--ink); }
.nav a.active::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0; right: 0;
  height: 1.5px;
  background: var(--clay);
}
.header-actions { display: flex; align-items: center; gap: 14px; }

.btn-login {
  display: inline-flex; align-items: center;
  padding: 8px 20px;
  font-family: var(--font-body);
  font-size: 0.84rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--paper);
  background: var(--ink);
  border: 1px solid var(--ink);
  border-radius: var(--r-sm);
  text-decoration: none;
  cursor: pointer;
  transition: background 0.18s, transform 0.18s;
}
.btn-login:hover { background: #000; transform: translateY(-1px); }

.mobile-menu-btn {
  display: none; background: none; border: none;
  color: var(--ink); cursor: pointer; padding: 8px;
}

/* ===== LAYOUT ===== */
main { padding-top: var(--header-h); }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 40px; }

/* small-caps section label */
.kicker {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--clay);
}
.kicker::before {
  content: ''; width: 26px; height: 1px; background: var(--clay); opacity: 0.6;
}

/* ===== HERO ===== */
.hero {
  padding: 90px 0 40px;
  text-align: center;
  position: relative;
}
.hero .kicker { justify-content: center; margin-bottom: 26px; animation: rise 0.7s 0.05s both; }
.hero h1 {
  font-family: var(--font-display);
  font-optical-sizing: auto;
  font-size: clamp(2.6rem, 6vw, 4.6rem);
  font-weight: 500;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 0 auto 22px;
  max-width: 15ch;
  animation: rise 0.7s 0.12s both;
}
.hero h1 em {
  font-style: italic;
  font-weight: 400;
  color: var(--clay);
}
.hero .subtitle {
  font-size: 1.12rem;
  color: var(--ink-2);
  max-width: min(46ch, 100%);
  margin: 0 auto 34px;
  line-height: 1.7;
  animation: rise 0.7s 0.2s both;
}
.hero-actions {
  display: flex; gap: 14px; justify-content: center; flex-wrap: wrap;
  animation: rise 0.7s 0.28s both;
}

.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 28px;
  font-family: var(--font-body);
  font-size: 0.95rem; font-weight: 600;
  color: var(--paper);
  background: var(--clay);
  border: 1px solid var(--clay);
  border-radius: var(--r-sm);
  text-decoration: none; cursor: pointer;
  transition: background 0.18s, transform 0.18s;
}
.btn-primary:hover { background: var(--clay-dark); border-color: var(--clay-dark); transform: translateY(-1px); }
.btn-primary .arr { transition: transform 0.2s; }
.btn-primary:hover .arr { transform: translateX(3px); }

.btn-secondary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 26px;
  font-family: var(--font-body);
  font-size: 0.95rem; font-weight: 600;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  text-decoration: none; cursor: pointer;
  transition: border-color 0.18s, background 0.18s;
}
.btn-secondary:hover { border-color: var(--ink); background: var(--card); }

/* hero centerpiece — butterfly eye */
.hero-figure {
  margin: 30px auto 0;
  max-width: 780px;
  position: relative;
  animation: rise 1s 0.4s both;
}
.hero-figure img {
  width: 100%;
  height: auto;
  display: block;
  animation: drift 9s ease-in-out infinite;
}
.hero-figure figcaption {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.hero-figure figcaption span { color: var(--clay); }

/* mono endpoint chip */
.endpoint-chip {
  display: inline-flex; align-items: center; gap: 10px;
  margin: 30px auto 0;
  padding: 9px 16px;
  max-width: 100%;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ink-2);
  animation: rise 0.7s 0.34s both;
}
.endpoint-chip .label { color: var(--ink-3); }
.endpoint-chip .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--olive); box-shadow: 0 0 0 3px rgba(109,111,67,0.15); }
.endpoint-chip b { color: var(--ink); font-weight: 500; }

/* ===== SECTION HEADER ===== */
.section-header { text-align: center; margin-bottom: 52px; }
.section-header .kicker { justify-content: center; margin-bottom: 18px; }
.section-header h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--ink);
  line-height: 1.1;
}
.section-header p { font-size: 1.02rem; color: var(--ink-2); margin-top: 12px; }

/* thin rule divider */
.rule {
  max-width: var(--maxw);
  margin: 0 auto;
  border: 0;
  border-top: 1px solid var(--line);
}

/* ===== FEATURES ===== */
.features { padding: 84px 0; }
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--card);
}
.feature-card {
  padding: 34px 30px 38px;
  border-right: 1px solid var(--line);
  transition: background 0.25s;
  position: relative;
}
.feature-card:last-child { border-right: none; }
.feature-card:hover { background: var(--card-2); }
.feature-index {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--clay);
  margin-bottom: 20px;
}
.feature-icon {
  width: 30px; height: 30px;
  margin-bottom: 16px;
  color: var(--ink);
  stroke: var(--ink);
}
.feature-card h3 {
  font-family: var(--font-display);
  font-size: 1.18rem;
  font-weight: 600;
  margin-bottom: 9px;
  color: var(--ink);
}
.feature-card p { font-size: 0.9rem; color: var(--ink-2); line-height: 1.65; }

/* ===== FOOTER ===== */
.footer {
  border-top: 1px solid var(--line);
  padding: 40px 0;
  margin-top: 40px;
}
.footer .container {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 16px;
}
.footer-brand { display: flex; align-items: center; gap: 10px; }
.footer-brand img { height: 24px; width: 24px; border-radius: 6px; opacity: 0.85; }
.footer-brand span { font-family: var(--font-display); font-weight: 600; font-size: 1rem; }
.footer p { font-size: 0.82rem; color: var(--ink-3); }
.footer-links { display: flex; gap: 22px; }
.footer-links a {
  font-size: 0.84rem; color: var(--ink-2); text-decoration: none; transition: color 0.18s;
}
.footer-links a:hover { color: var(--clay); }

/* ===== MODELS ===== */
.models-section { padding: 70px 0 60px; }
.provider-group { margin-bottom: 56px; }
.provider-label {
  font-family: var(--font-display);
  font-size: 1.3rem; font-weight: 600;
  margin-bottom: 22px;
  display: flex; align-items: center; gap: 12px;
  color: var(--ink);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.provider-icon { color: var(--clay); opacity: 0.9; }
.models-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(268px, 1fr));
  gap: 16px;
}
.model-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 22px 22px 20px;
  transition: border-color 0.2s, transform 0.2s;
}
.model-card:hover { border-color: var(--line-2); transform: translateY(-2px); }
.model-card-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.model-info { display: flex; align-items: center; gap: 12px; }
.model-icon {
  width: 38px; height: 38px; padding: 8px;
  border-radius: var(--r-sm);
  background: var(--card-2);
  border: 1px solid var(--line);
  color: var(--ink-2);
  flex-shrink: 0;
}
.model-icon.anthropic { color: var(--clay); background: #f6e7df; border-color: var(--clay-soft); }
.model-icon.openai { color: var(--olive); background: #edeee1; border-color: #d6d8c0; }
.model-name { font-family: var(--font-display); font-size: 1.04rem; font-weight: 600; display: block; color: var(--ink); }
.model-provider { font-family: var(--font-mono); font-size: 0.64rem; font-weight: 500; color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.12em; }
.model-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.tag {
  font-family: var(--font-mono);
  font-size: 0.68rem; font-weight: 500;
  padding: 3px 9px;
  border-radius: 4px;
  background: var(--card-2);
  color: var(--ink-2);
  border: 1px solid var(--line);
}
.tag.highlight { background: #f6e7df; color: var(--clay-dark); border-color: var(--clay-soft); }
.model-status {
  display: flex; align-items: center; gap: 7px;
  font-size: 0.76rem; color: var(--olive); margin-top: 16px; font-weight: 500;
}
.model-status .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--olive); box-shadow: 0 0 0 3px rgba(109,111,67,0.15); }

/* ===== PRICING ===== */
.pricing-section { padding: 70px 0 60px; }
.pricing-info {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 22px 32px;
  text-align: center;
  margin-bottom: 56px;
  font-size: 0.96rem;
  color: var(--ink-2);
}
.pricing-info strong { font-family: var(--font-display); font-size: 1.4rem; color: var(--clay); font-weight: 600; }
.pricing-provider-title {
  display: flex; align-items: center; justify-content: center; gap: 12px;
  font-family: var(--font-display);
  font-size: 1.55rem; font-weight: 600;
  margin: 52px 0 26px;
  color: var(--ink);
}
.pricing-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 22px;
  max-width: 720px;
  margin: 0 auto 32px;
}
.pricing-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 34px 32px;
  position: relative;
  transition: border-color 0.2s, transform 0.2s;
}
.pricing-card:hover { border-color: var(--line-2); transform: translateY(-2px); }
.pricing-card.featured { border-color: var(--clay); background: linear-gradient(180deg, #f8ece5 0%, var(--card) 60%); }
.pricing-card.featured::before {
  content: '首选'; position: absolute; top: -11px; left: 32px;
  font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.1em;
  background: var(--clay); color: var(--paper); padding: 4px 12px; border-radius: 100px;
}
.pricing-card h3 { font-family: var(--font-display); font-size: 1.24rem; font-weight: 600; margin-bottom: 14px; color: var(--ink); }
.pricing-badge {
  display: inline-block; padding: 5px 13px;
  font-family: var(--font-mono); font-size: 0.72rem;
  border-radius: 100px;
  background: var(--card-2); color: var(--ink-2); border: 1px solid var(--line);
  margin-bottom: 22px;
}
.pricing-discount {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 18px 0;
  margin-bottom: 24px;
  display: flex; align-items: baseline; gap: 6px;
}
.pricing-discount .discount-label { font-size: 0.84rem; color: var(--ink-2); }
.pricing-discount .discount-value {
  font-family: var(--font-display); font-size: 2.6rem; font-weight: 600;
  color: var(--clay); line-height: 1;
}
.pricing-discount .discount-unit { font-size: 1.1rem; font-weight: 600; color: var(--ink-2); }
.pricing-features { margin-bottom: 26px; }
.pricing-features-title {
  font-family: var(--font-mono); font-size: 0.68rem; font-weight: 500;
  color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.12em; margin-bottom: 14px;
}
.pricing-features ul { list-style: none; padding: 0; }
.pricing-features li {
  font-size: 0.9rem; color: var(--ink-2); padding: 5px 0 5px 22px; position: relative;
}
.pricing-features li::before {
  content: ''; position: absolute; left: 0; top: 13px;
  width: 7px; height: 7px; border-radius: 50%; background: var(--clay); opacity: 0.7;
}
.btn-pricing {
  display: block; width: 100%; padding: 12px; text-align: center;
  font-family: var(--font-body); font-size: 0.92rem; font-weight: 600;
  color: var(--ink); background: transparent;
  border: 1px solid var(--ink); border-radius: var(--r-sm);
  text-decoration: none; transition: background 0.18s, color 0.18s;
}
.btn-pricing:hover { background: var(--ink); color: var(--paper); }
.pricing-card.featured .btn-pricing { background: var(--clay); border-color: var(--clay); color: var(--paper); }
.pricing-card.featured .btn-pricing:hover { background: var(--clay-dark); border-color: var(--clay-dark); }

/* ===== DOCS ===== */
.docs-section { padding: 60px 0; }
.docs-layout { display: grid; grid-template-columns: 232px 1fr; gap: 56px; }
.docs-sidebar { position: sticky; top: calc(var(--header-h) + 28px); align-self: start; }
.docs-sidebar-group { margin-bottom: 26px; }
.docs-sidebar-group h4 {
  font-family: var(--font-mono); font-size: 0.68rem; font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.12em; color: var(--ink-3); margin-bottom: 10px;
}
.docs-sidebar-group a {
  display: block; padding: 7px 13px; font-size: 0.88rem;
  color: var(--ink-2); text-decoration: none; border-radius: var(--r-sm);
  transition: color 0.18s, background 0.18s; margin-bottom: 2px;
  border-left: 2px solid transparent;
}
.docs-sidebar-group a:hover { color: var(--ink); background: var(--card); }
.docs-sidebar-group a.active { color: var(--clay); background: var(--card); border-left-color: var(--clay); }
.docs-content { min-width: 0; }
.docs-content h2 {
  font-family: var(--font-display); font-size: 1.7rem; font-weight: 600;
  margin-bottom: 16px; padding-top: 40px; color: var(--ink);
  letter-spacing: -0.01em;
}
.docs-content h2:first-child { padding-top: 0; }
.docs-content h3 { font-family: var(--font-display); font-size: 1.18rem; font-weight: 600; margin: 26px 0 12px; color: var(--ink); }
.docs-content p { color: var(--ink-2); margin-bottom: 16px; line-height: 1.75; }
.docs-content a { color: var(--clay); text-decoration: none; border-bottom: 1px solid var(--clay-soft); }
.docs-content a:hover { border-bottom-color: var(--clay); }
.docs-content pre {
  background: var(--card-2);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 20px;
  margin-bottom: 20px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.82rem; line-height: 1.6; color: var(--ink);
}
.docs-content code { font-family: var(--font-mono); font-size: 0.82rem; background: var(--card-2); padding: 2px 6px; border-radius: 4px; color: var(--clay-dark); border: 1px solid var(--line); }
.docs-content pre code { background: none; padding: 0; color: inherit; border: none; }
.docs-content ol { color: var(--ink-2); margin-bottom: 16px; padding-left: 20px; line-height: 2; }

/* ===== DECORATIVE MARGINALIA (butterflies) ===== */
.marginalia { position: absolute; pointer-events: none; z-index: 0; opacity: 0.9; }
.marginalia img { display: block; width: 100%; height: auto; }
.m1 { width: 92px; top: 120px; left: 3%; transform: rotate(-12deg); animation: drift 11s ease-in-out infinite; }
.m2 { width: 76px; top: 210px; right: 4%; transform: rotate(14deg); animation: drift 13s ease-in-out infinite reverse; }
.m3 { width: 64px; bottom: 40px; left: 8%; transform: rotate(8deg); animation: drift 12s ease-in-out infinite; }

/* ===== LIVING SPECIMEN — butterfly that flies to the wordmark ===== */
.bfly {
  position: fixed;
  left: 0; top: 0;
  width: 46px; height: 39px;
  z-index: 1001;
  pointer-events: none;
  will-change: transform;
  display: none;
}
.bfly.is-active { display: block; }
.bfly.is-perched {
  position: absolute;
  z-index: 3;
  transform: rotate(-10deg) scale(0.82);
}
.bfly-inner {
  position: relative;
  width: 100%; height: 100%;
  perspective: 190px;
  transform-style: preserve-3d;
  filter: drop-shadow(0 2px 3px rgba(35, 33, 28, 0.22));
}
/* each wing is the full specimen clipped to one half, folding on the body axis */
.bfly-wing {
  position: absolute; inset: 0;
  background: url('/assets/images/bfly-eyespot.webp') center / 100% 100% no-repeat;
}
.bfly-wing--l { clip-path: inset(0 49.6% 0 0); transform: rotateY(16deg); }
.bfly-wing--r { clip-path: inset(0 0 0 49.6%); transform: rotateY(-16deg); }

/* flight stroke: slow fold-up recovery, fast snap-down power stroke,
   motion blur at peak wing speed, body bobbing with each beat */
.bfly.is-flying .bfly-wing--l { animation: bfly-beat-l 0.22s linear infinite; }
.bfly.is-flying .bfly-wing--r { animation: bfly-beat-r 0.22s linear infinite; }
.bfly.is-flying .bfly-inner { animation: bfly-body-beat 0.22s linear infinite; }
/* the two deliberate flaps after landing */
.bfly.is-settling .bfly-wing--l { animation: bfly-flap-l 0.8s cubic-bezier(0.45, 0, 0.4, 1) 2; }
.bfly.is-settling .bfly-wing--r { animation: bfly-flap-r 0.8s cubic-bezier(0.45, 0, 0.4, 1) 2; }
.bfly.is-settling .bfly-inner { animation: bfly-body-sway 0.8s cubic-bezier(0.45, 0, 0.4, 1) 2; }
/* occasional idle flap */
.bfly.is-flap .bfly-wing--l { animation: bfly-flap-l 0.95s ease-in-out 1; }
.bfly.is-flap .bfly-wing--r { animation: bfly-flap-r 0.95s ease-in-out 1; }
/* quick greeting when the logo is hovered */
.bfly.is-greet .bfly-wing--l { animation: bfly-flap-l 0.3s ease-in-out 2; }
.bfly.is-greet .bfly-wing--r { animation: bfly-flap-r 0.3s ease-in-out 2; }

@keyframes bfly-flap-l {
  0%, 100% { transform: rotateY(16deg); }
  50% { transform: rotateY(74deg); }
}
@keyframes bfly-flap-r {
  0%, 100% { transform: rotateY(-16deg); }
  50% { transform: rotateY(-74deg); }
}
@keyframes bfly-beat-l {
  0%, 100% { transform: rotateY(8deg); filter: blur(0); }
  30% { transform: rotateY(54deg); filter: blur(1.2px); }
  60% { transform: rotateY(88deg); filter: blur(0.3px); }
  82% { transform: rotateY(42deg); filter: blur(1.5px); }
}
@keyframes bfly-beat-r {
  0%, 100% { transform: rotateY(-8deg); filter: blur(0); }
  30% { transform: rotateY(-54deg); filter: blur(1.2px); }
  60% { transform: rotateY(-88deg); filter: blur(0.3px); }
  82% { transform: rotateY(-42deg); filter: blur(1.5px); }
}
/* wings folded = recovery = body sinks; snap-down = body lifts */
@keyframes bfly-body-beat {
  0%, 100% { transform: translateY(-5%); }
  60% { transform: translateY(7%); }
}
@keyframes bfly-body-sway {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(4%); }
}

/* ===== ANIMATIONS ===== */
@keyframes rise {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes drift {
  0%, 100% { transform: translateY(0) rotate(var(--rot, 0deg)); }
  50% { transform: translateY(-9px) rotate(var(--rot, 0deg)); }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-card:nth-child(2) { border-right: none; }
  .feature-card:nth-child(1), .feature-card:nth-child(2) { border-bottom: 1px solid var(--line); }
  .docs-layout { grid-template-columns: 1fr; gap: 32px; }
  .docs-sidebar { position: static; border-bottom: 1px solid var(--line); padding-bottom: 24px; }
}
@media (max-width: 768px) {
  .header-inner { padding: 0 16px; gap: 10px; }
  .container { padding: 0 22px; }
  .logo-text { font-size: 1.12rem; }
  .btn-login { padding: 7px 15px; font-size: 0.8rem; }
  .nav {
    display: none; position: absolute; top: var(--header-h); left: 0; right: 0;
    background: var(--paper); border-bottom: 1px solid var(--line);
    flex-direction: column; padding: 20px 22px; gap: 6px; align-items: flex-start;
  }
  .nav.open { display: flex; }
  .nav a { padding: 8px 0; width: 100%; }
  .mobile-menu-btn { display: block; }
  .hero { padding: 60px 0 20px; }
  .marginalia { display: none; }
  .bfly { width: 36px; height: 30px; }
  .footer .container { flex-direction: column; text-align: center; }
  .endpoint-chip { font-size: 0.74rem; padding: 8px 14px; gap: 8px; }
  .endpoint-chip .label { display: none; }
  .hero .subtitle { font-size: 1rem; max-width: 100%; }
}
@media (max-width: 560px) {
  .features-grid { grid-template-columns: 1fr; }
  .feature-card { border-right: none !important; border-bottom: 1px solid var(--line); }
  .feature-card:last-child { border-bottom: none; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .btn-primary, .btn-secondary { justify-content: center; }
  .pricing-cards { grid-template-columns: 1fr; }
}