/* 帧语 FrameLang（剧来了）— high-end product marketing system */
:root {
  --bg: #05060a;
  --bg-elev: #0b0d14;
  --card: rgba(255, 255, 255, 0.035);
  --card-border: rgba(255, 255, 255, 0.08);
  --ink: #f4f1ea;
  --muted: #9a958c;
  --faint: #5c574f;
  --accent: #c4a574;
  --accent-2: #7dd3c7;
  --glow: rgba(196, 165, 116, 0.18);
  --glow-2: rgba(125, 211, 199, 0.12);
  --danger: #e07a6a;
  --good: #7bc9a0;
  --max: 1120px;
  --nav-h: 72px;
  --serif: "Iowan Old Style", "Palatino Linotype", "Songti SC", "Noto Serif SC", Georgia, serif;
  --sans: "SF Pro Display", "PingFang SC", "Helvetica Neue", system-ui, sans-serif;
  --mono: "SF Mono", ui-monospace, Menlo, monospace;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* cinematic atmosphere */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(900px 500px at 12% -10%, var(--glow), transparent 55%),
    radial-gradient(800px 480px at 88% 0%, var(--glow-2), transparent 50%),
    radial-gradient(600px 400px at 50% 100%, rgba(255,255,255,0.03), transparent 60%);
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

a { color: var(--accent-2); text-decoration: none; transition: color 0.2s var(--ease); }
a:hover { color: var(--ink); }

.wrap {
  position: relative;
  z-index: 2;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px 96px;
}

/* —— Nav —— */
header.site {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-h);
  backdrop-filter: blur(18px) saturate(1.2);
  background: rgba(5, 6, 10, 0.72);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.nav {
  max-width: var(--max);
  margin: 0 auto;
  height: 100%;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 8px 18px;
  flex-wrap: wrap;
}
.logo {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  margin-right: auto;
  color: var(--ink) !important;
  text-decoration: none !important;
  font-weight: 600;
  letter-spacing: -0.02em;
  font-size: 1.05rem;
}
.logo span {
  font-weight: 500;
  color: var(--muted);
}
.logo .cn-name {
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: none;
  color: var(--accent);
  border: 1px solid rgba(196, 165, 116, 0.35);
  border-radius: 999px;
  padding: 3px 9px;
  position: relative;
  top: -1px;
}
.nav > a:not(.logo):not(.btn) {
  color: var(--muted);
  font-size: 0.88rem;
  text-decoration: none;
  padding: 6px 2px;
}
.nav > a:not(.logo):not(.btn):hover,
.nav > a[aria-current="page"] {
  color: var(--ink);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: linear-gradient(180deg, #d4b896 0%, var(--accent) 100%);
  color: #1a140c !important;
  padding: 11px 18px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none !important;
  border: 0;
  box-shadow: 0 0 0 1px rgba(255,255,255,0.08) inset, 0 8px 24px rgba(196,165,116,0.18);
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 0 1px rgba(255,255,255,0.12) inset, 0 12px 32px rgba(196,165,116,0.28);
  color: #0d0a06 !important;
}
.btn.ghost {
  background: transparent;
  color: var(--ink) !important;
  border: 1px solid rgba(255,255,255,0.14);
  box-shadow: none;
}
.btn.ghost:hover {
  border-color: rgba(255,255,255,0.28);
  background: rgba(255,255,255,0.04);
}

/* —— Hero —— */
.hero {
  padding: 72px 0 40px;
  max-width: 820px;
}
.brand-line {
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--faint);
  margin: 0 0 20px;
}
.brand-line strong { color: var(--accent); font-weight: 600; letter-spacing: 0.08em; text-transform: none; }
.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 22px;
}
.badge {
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.03);
  padding: 6px 12px;
  border-radius: 999px;
}
.hero h1 {
  font-family: var(--serif);
  font-size: clamp(2.15rem, 5.2vw, 3.5rem);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -0.03em;
  margin: 0 0 20px;
  color: var(--ink);
}
.hero h1 em {
  font-style: italic;
  color: var(--accent);
  font-weight: 400;
}
.lead {
  color: var(--muted);
  font-size: 1.12rem;
  max-width: 38rem;
  margin: 0 0 28px;
  line-height: 1.7;
}
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

/* —— Display blocks —— */
.demo-box, .stage {
  position: relative;
  margin: 28px 0 48px;
  border-radius: 24px;
  border: 1px solid var(--card-border);
  background:
    linear-gradient(145deg, rgba(255,255,255,0.05), rgba(255,255,255,0.01)),
    var(--bg-elev);
  overflow: hidden;
  min-height: 280px;
  padding: 48px 32px;
  text-align: center;
}
.stage::before {
  content: "";
  position: absolute;
  inset: -20%;
  background:
    radial-gradient(circle at 30% 40%, rgba(196,165,116,0.15), transparent 40%),
    radial-gradient(circle at 70% 60%, rgba(125,211,199,0.1), transparent 42%);
  pointer-events: none;
}
.stage-inner { position: relative; z-index: 1; }
.stage strong {
  display: block;
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 500;
  margin-bottom: 10px;
  color: var(--ink);
}
.stage p, .demo-box { color: var(--muted); font-size: 0.95rem; }
.stage-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 28px;
  text-align: left;
}
.stage-panel {
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(0,0,0,0.35);
  padding: 18px 16px;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.5;
  color: #c9c2b6;
}
.stage-panel .tag {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--accent);
}
.stage-panel.good .tag { color: var(--accent-2); }

/* —— Sections —— */
h2 {
  font-family: var(--serif);
  font-size: clamp(1.45rem, 2.5vw, 1.85rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  margin: 56px 0 18px;
  color: var(--ink);
  border: 0;
  padding: 0;
}
h2 .num {
  display: inline-block;
  margin-right: 10px;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
}
h3 {
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 8px;
}
.section-lead {
  color: var(--muted);
  max-width: 36rem;
  margin: -6px 0 22px;
}

.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 22px 20px;
  margin: 0;
  backdrop-filter: blur(8px);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}
.card:hover {
  border-color: rgba(255,255,255,0.14);
  transform: translateY(-2px);
}
.card h3 { margin-top: 0; }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }

.grid2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.grid4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
@media (max-width: 900px) {
  .grid4 { grid-template-columns: 1fr 1fr; }
  .stage-split { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .grid2, .grid4 { grid-template-columns: 1fr; }
  .hero { padding-top: 48px; }
  .nav { gap: 8px 12px; padding: 10px 16px; height: auto; min-height: var(--nav-h); }
  .nav > a:not(.logo):not(.btn) { font-size: 0.8rem; }
}

.icon-dot {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  margin-bottom: 14px;
  background: rgba(196,165,116,0.12);
  border: 1px solid rgba(196,165,116,0.22);
  color: var(--accent);
  font-size: 0.85rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  margin: 8px 0 24px;
}
th, td {
  text-align: left;
  padding: 14px 12px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  vertical-align: top;
}
th {
  color: var(--faint);
  font-weight: 500;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
td { color: var(--muted); }
td:first-child { color: var(--ink); font-weight: 500; }

ul, ol { padding-left: 1.15rem; color: var(--muted); }
li { margin: 8px 0; }
li.ok { color: var(--good); }
li.warn { color: var(--accent); }

pre, code { font-family: var(--mono); }
pre {
  background: #08090f;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 16px;
  padding: 18px 16px;
  overflow-x: auto;
  font-size: 0.82rem;
  color: #d2cbbf;
  line-height: 1.55;
}
code {
  font-size: 0.88em;
  color: var(--accent-2);
}

.crumbs {
  color: var(--faint);
  font-size: 0.82rem;
  margin: 28px 0 8px;
}
.crumbs a { color: var(--faint); }
.meta {
  color: var(--faint);
  font-size: 0.85rem;
  margin: 0 0 24px;
}

.cta-band {
  margin: 64px 0 24px;
  padding: 36px 28px;
  border-radius: 24px;
  border: 1px solid rgba(196,165,116,0.25);
  background:
    linear-gradient(135deg, rgba(196,165,116,0.12), transparent 55%),
    rgba(255,255,255,0.02);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px 24px;
}
.cta-band h2 { margin: 0; flex: 1 1 240px; }
.cta-band p { margin: 0; color: var(--muted); flex: 1 1 100%; }

footer.site {
  position: relative;
  z-index: 2;
  border-top: 1px solid rgba(255,255,255,0.06);
  margin-top: 48px;
  padding: 36px 24px 56px;
  color: var(--faint);
  font-size: 0.85rem;
}
footer.site .wrap { padding-bottom: 0; }
footer.site a { color: var(--muted); }

.kicker {
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 12px;
}

/* article prose */
.prose h2 { margin-top: 48px; }
.prose p { color: var(--muted); max-width: 40rem; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

.md-hr { border: 0; border-top: 1px solid rgba(255,255,255,0.08); margin: 32px 0; }
blockquote {
  margin: 16px 0; padding: 12px 16px;
  border-left: 3px solid var(--accent);
  background: rgba(255,255,255,0.03);
  color: var(--muted); border-radius: 0 12px 12px 0;
}
blockquote p { margin: 0; }
.prose h1 {
  font-family: var(--serif); font-weight: 500;
  font-size: clamp(1.85rem, 4vw, 2.75rem);
  letter-spacing: -0.03em; line-height: 1.15; margin: 28px 0 16px;
}