/* ============================================================
   Codex Feishu — Website Styles
   Design: Modern dark, clean, developer-focused
   ============================================================ */

/* ── CSS Variables ── */
:root {
  --bg:            #080c14;
  --bg-card:       rgba(13, 19, 31, 0.85);
  --bg-card-hover: rgba(18, 26, 42, 0.92);
  --bg-code:       rgba(8, 12, 20, 0.96);
  --border:        rgba(255, 255, 255, 0.07);
  --border-hover:  rgba(255, 255, 255, 0.14);
  --text:          #edeae2;
  --text-soft:     rgba(237, 234, 226, 0.68);
  --text-muted:    rgba(237, 234, 226, 0.42);
  --amber:         #d4845a;
  --amber-light:   #e8a87a;
  --amber-soft:    rgba(212, 132, 90, 0.15);
  --teal:          #5bb8b0;
  --teal-light:    #7dccc5;
  --teal-soft:     rgba(91, 184, 176, 0.15);
  --radius-sm:     10px;
  --radius-md:     16px;
  --radius-lg:     22px;
  --radius-xl:     30px;
  --shadow-card:   0 4px 32px rgba(0, 0, 0, 0.32), 0 1px 0 rgba(255,255,255,0.04) inset;
  --shadow-hover:  0 8px 48px rgba(0, 0, 0, 0.48);
  --max-w:         1200px;
  --font-sans:     'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:     'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --font-serif-zh: 'Noto Serif SC', 'Songti SC', 'STSong', serif;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }
code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: rgba(255,255,255,0.07);
  padding: 0.1em 0.4em;
  border-radius: 5px;
  color: var(--amber-light);
}
pre code { background: none; padding: 0; font-size: inherit; color: inherit; }
ul { list-style: none; }
img, svg { display: block; }

/* ── Background Decorations ── */
.bg-orbs {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.6;
}
.orb-1 {
  width: 500px; height: 500px;
  top: -100px; left: -150px;
  background: radial-gradient(circle, rgba(212,132,90,0.18) 0%, transparent 70%);
}
.orb-2 {
  width: 600px; height: 600px;
  top: 200px; right: -200px;
  background: radial-gradient(circle, rgba(91,184,176,0.14) 0%, transparent 70%);
}
.orb-3 {
  width: 400px; height: 400px;
  bottom: 100px; left: 30%;
  background: radial-gradient(circle, rgba(212,132,90,0.1) 0%, transparent 70%);
}
.bg-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.5) 0%, transparent 80%);
}

/* ── Layout ── */
.site-shell {
  position: relative;
  z-index: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px 80px;
}

/* ── Header ── */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8, 12, 20, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  margin: 0 -24px;
  padding-left: 24px;
  padding-right: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.brand-icon { flex-shrink: 0; }
.brand-name {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}
.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-link {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-soft);
  transition: color 160ms, background 160ms;
}
.nav-link:hover {
  color: var(--text);
  background: rgba(255,255,255,0.06);
}
.nav-cta {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  background: rgba(255,255,255,0.08);
  border: 1px solid var(--border-hover);
  transition: background 160ms, border-color 160ms, transform 160ms;
  margin-left: 4px;
}
.nav-cta:hover {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.2);
  transform: translateY(-1px);
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  border-radius: 8px;
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 200ms, opacity 200ms;
}

/* ── Announcement ── */
.announcement {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  margin: 20px 0 0;
  border-radius: var(--radius-md);
  background: rgba(212,132,90,0.08);
  border: 1px solid rgba(212,132,90,0.2);
  font-size: 13.5px;
  flex-wrap: wrap;
}
.announcement-badge {
  display: flex;
  align-items: center;
  gap: 7px;
  font-weight: 600;
  color: var(--amber-light);
  white-space: nowrap;
}
.pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--amber);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}
.announcement-text { color: var(--text-soft); flex: 1; min-width: 200px; }
.announcement-link {
  color: var(--amber-light);
  font-weight: 600;
  font-size: 13px;
  white-space: nowrap;
  transition: opacity 160ms;
}
.announcement-link:hover { opacity: 0.75; }

/* ── Hero ── */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
  padding: 60px 0 20px;
}
.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
  font-size: 12px;
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.eyebrow-chip {
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--amber-soft);
  border: 1px solid rgba(212,132,90,0.25);
  color: var(--amber-light);
}
.eyebrow-sep { color: var(--border-hover); }
.hero-title {
  display: grid;
  gap: 0.04em;
  margin-bottom: 24px;
}
html[lang="zh-CN"] .hero-title {
  font-family: var(--font-serif-zh);
  font-size: clamp(52px, 5.8vw, 84px);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.04em;
}
html[lang="en"] .hero-title {
  font-size: clamp(44px, 5vw, 72px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.04em;
}
.title-line { display: block; }
.title-accent { color: var(--amber); }
.hero-desc {
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--text-soft);
  max-width: 36rem;
  margin-bottom: 32px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}
.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.tag {
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-family: var(--font-mono);
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  color: var(--text-soft);
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  transition: transform 160ms, box-shadow 160ms, background 160ms, border-color 160ms;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  background: linear-gradient(135deg, var(--amber-light), var(--amber));
  color: #12100e;
  box-shadow: 0 8px 24px rgba(212,132,90,0.28);
}
.btn-primary:hover { box-shadow: 0 12px 32px rgba(212,132,90,0.4); }
.btn-secondary {
  background: rgba(255,255,255,0.07);
  color: var(--text);
  border: 1px solid var(--border-hover);
}
.btn-secondary:hover { background: rgba(255,255,255,0.11); border-color: rgba(255,255,255,0.2); }
.btn-ghost {
  background: transparent;
  color: var(--text-soft);
  border: 1px solid var(--border);
}
.btn-ghost:hover { color: var(--text); background: rgba(255,255,255,0.05); }

/* ── Hero Demo ── */
.hero-demo {
  display: grid;
  gap: 14px;
}
.demo-card {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--bg-card);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  backdrop-filter: blur(12px);
}
.demo-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
}
.demo-dots {
  display: flex;
  gap: 5px;
}
.demo-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
}
.demo-dots span:first-child { background: rgba(255,100,80,0.6); }
.demo-dots span:nth-child(2) { background: rgba(255,180,50,0.6); }
.demo-dots span:last-child { background: rgba(80,200,100,0.6); }
.demo-title {
  font-size: 11px;
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  flex: 1;
}
.demo-badge {
  font-size: 10px;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--amber);
  background: var(--amber-soft);
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid rgba(212,132,90,0.2);
}
.demo-badge-teal {
  color: var(--teal);
  background: var(--teal-soft);
  border-color: rgba(91,184,176,0.2);
}
.demo-code {
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.9;
  color: var(--text-soft);
  white-space: pre-wrap;
  word-break: break-all;
}
.demo-signals {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.signal-item {
  padding: 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg-card);
  display: grid;
  gap: 6px;
}
.signal-label {
  font-size: 10px;
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.signal-text {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text-soft);
  font-weight: 500;
}

/* ── Color helpers ── */
.c-amber { color: var(--amber-light); }
.c-teal  { color: var(--teal-light); }
.c-muted { color: var(--text-muted); }

/* ── Metrics Rail ── */
.metrics-rail {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  align-items: start;
  gap: 0;
  margin-top: 20px;
  padding: 28px 32px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  background: var(--bg-card);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(12px);
}
.metric-item { padding: 4px 24px; }
.metric-item:first-child { padding-left: 0; }
.metric-item:last-child { padding-right: 0; }
.metric-divider {
  width: 1px;
  align-self: stretch;
  background: var(--border);
  margin: 4px 0;
}
.metric-label {
  display: block;
  font-size: 10px;
  font-family: var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.metric-title {
  display: block;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}
.metric-desc {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text-soft);
}

/* ── Section ── */
.section {
  margin-top: 20px;
  padding: 40px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  background: var(--bg-card);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(12px);
}
.section-head {
  margin-bottom: 32px;
}
.section-label {
  display: block;
  font-size: 11px;
  font-family: var(--font-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(26px, 3vw, 40px);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -0.03em;
  max-width: 22ch;
}
html[lang="zh-CN"] .section-title {
  font-family: var(--font-serif-zh);
  font-weight: 600;
}

/* ── Flow Grid ── */
.flow-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr auto 1fr;
  align-items: start;
  gap: 0;
}
.flow-card {
  padding: 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.025);
  display: grid;
  gap: 10px;
  transition: border-color 200ms, background 200ms;
}
.flow-card:hover {
  border-color: var(--border-hover);
  background: rgba(255,255,255,0.04);
}
.flow-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 8px;
  color: var(--text-muted);
  font-size: 16px;
  margin-top: 20px;
}
.flow-num {
  font-size: 11px;
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  color: var(--amber);
  font-weight: 600;
}
.flow-title {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: -0.01em;
}
.flow-desc {
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--text-soft);
}
.flow-tag {
  display: inline-flex;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 10px;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  background: var(--teal-soft);
  color: var(--teal-light);
  border: 1px solid rgba(91,184,176,0.2);
  width: fit-content;
}

/* ── Mode Grid ── */
.mode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.mode-card {
  padding: 28px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.025);
  display: grid;
  gap: 14px;
  transition: border-color 200ms, background 200ms;
}
.mode-card:hover {
  border-color: var(--border-hover);
  background: rgba(255,255,255,0.04);
}
.mode-card-active {
  border-color: rgba(212,132,90,0.25);
  background: rgba(212,132,90,0.04);
}
.mode-card-active:hover {
  border-color: rgba(212,132,90,0.4);
  background: rgba(212,132,90,0.07);
}
.mode-icon { color: var(--amber); }
.mode-card-active .mode-icon { color: var(--amber-light); }
.mode-badge {
  display: inline-flex;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  background: var(--amber-soft);
  color: var(--amber-light);
  border: 1px solid rgba(212,132,90,0.25);
  width: fit-content;
}
.mode-badge-teal {
  background: var(--teal-soft);
  color: var(--teal-light);
  border-color: rgba(91,184,176,0.25);
}
.mode-name {
  font-size: 22px;
  font-weight: 700;
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
}
.mode-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-soft);
}
.mode-pros {
  display: grid;
  gap: 8px;
}
.mode-pros li {
  font-size: 13.5px;
  color: var(--text-soft);
  padding-left: 18px;
  position: relative;
}
.mode-pros li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--teal);
  font-size: 12px;
}
.mode-limit {
  font-size: 12px;
  color: var(--text-muted);
  padding: 8px 12px;
  border-radius: 8px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
}

/* ── Capability Grid ── */
.cap-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.cap-card {
  padding: 22px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.025);
  display: grid;
  gap: 10px;
  transition: border-color 200ms, background 200ms, transform 200ms;
}
.cap-card:hover {
  border-color: var(--border-hover);
  background: rgba(255,255,255,0.04);
  transform: translateY(-2px);
}
.cap-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.cap-icon-amber {
  background: var(--amber-soft);
  color: var(--amber-light);
  border: 1px solid rgba(212,132,90,0.2);
}
.cap-icon-teal {
  background: var(--teal-soft);
  color: var(--teal-light);
  border: 1px solid rgba(91,184,176,0.2);
}
.cap-label {
  font-size: 10px;
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.cap-title {
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: -0.01em;
}
.cap-desc {
  font-size: 13px;
  line-height: 1.75;
  color: var(--text-soft);
}

/* ── Quick Start ── */
.qs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr minmax(240px, 0.85fr);
  gap: 14px;
}
.qs-card {
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.025);
  overflow: hidden;
}
.qs-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
}
.qs-card-label {
  font-size: 11px;
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.qs-card-sub {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--teal);
}
.qs-pre {
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.9;
  color: var(--text-soft);
  white-space: pre-wrap;
}
.qs-summary {
  background: rgba(91,184,176,0.04);
  border-color: rgba(91,184,176,0.15);
}
.qs-list {
  padding: 16px;
  display: grid;
  gap: 14px;
}
.qs-list li {
  display: grid;
  gap: 4px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}
.qs-list li:last-child { padding-bottom: 0; border-bottom: none; }
.qs-list strong { font-size: 14px; font-weight: 600; }
.qs-list span { font-size: 12.5px; color: var(--text-soft); line-height: 1.6; }

/* ── Configuration ── */
.config-layout {
  display: grid;
  grid-template-columns: 1fr 0.7fr;
  gap: 24px;
  align-items: start;
}
.config-code-wrap {
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  overflow: hidden;
}
.config-code-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--border);
}
.config-filename {
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text-muted);
}
.config-badge {
  font-size: 10px;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  color: var(--teal);
  background: var(--teal-soft);
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid rgba(91,184,176,0.2);
}
.config-pre {
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.9;
  color: var(--text-soft);
  background: var(--bg-code);
  white-space: pre-wrap;
  overflow-x: auto;
}
.config-tips {
  display: grid;
  gap: 14px;
}
.config-tip {
  display: flex;
  gap: 12px;
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
}
.tip-icon {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.tip-icon-amber {
  background: var(--amber-soft);
  color: var(--amber-light);
}
.tip-icon-teal {
  background: var(--teal-soft);
  color: var(--teal-light);
}
.config-tip strong {
  display: block;
  font-size: 13.5px;
  font-weight: 600;
  margin-bottom: 4px;
}
.config-tip p {
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--text-soft);
}

/* ── Resources Grid ── */
.res-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.res-card {
  display: grid;
  gap: 8px;
  padding: 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.025);
  transition: border-color 200ms, background 200ms, transform 200ms;
}
.res-card:hover {
  border-color: rgba(212,132,90,0.3);
  background: rgba(212,132,90,0.05);
  transform: translateY(-3px);
}
.res-icon {
  color: var(--amber);
  opacity: 0.8;
}
.res-card strong {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.res-card span {
  font-size: 13px;
  line-height: 1.65;
  color: var(--text-soft);
}

/* ── CTA ── */
.cta {
  margin-top: 20px;
  padding: 48px;
  border-radius: var(--radius-xl);
  border: 1px solid rgba(212,132,90,0.2);
  background: linear-gradient(135deg, rgba(212,132,90,0.07) 0%, rgba(91,184,176,0.05) 100%);
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}
.cta-content { position: relative; z-index: 1; }
.cta-title {
  font-size: clamp(24px, 3vw, 38px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.03em;
  max-width: 24ch;
  margin: 12px 0 14px;
}
html[lang="zh-CN"] .cta-title { font-family: var(--font-serif-zh); }
.cta-desc {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-soft);
  max-width: 42rem;
  margin-bottom: 28px;
}
.cta-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.cta-deco {
  position: absolute;
  right: -60px;
  top: -60px;
  pointer-events: none;
}
.cta-orb {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(212,132,90,0.15) 0%, transparent 70%);
  filter: blur(40px);
}

/* ── Footer ── */
.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-top: 24px;
  padding: 20px 0;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.footer-tagline {
  font-size: 13px;
  color: var(--text-muted);
}
.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}
.footer-nav a {
  padding: 5px 10px;
  border-radius: 6px;
  font-size: 13px;
  color: var(--text-muted);
  transition: color 160ms, background 160ms;
}
.footer-nav a:hover {
  color: var(--text);
  background: rgba(255,255,255,0.05);
}

/* ── Animations ── */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 600ms cubic-bezier(0.2, 0.8, 0.2, 1), transform 600ms cubic-bezier(0.2, 0.8, 0.2, 1);
}
.fade-in.visible, .fade-in.delay-1, .fade-in.delay-2 {
  opacity: 1;
  transform: translateY(0);
}
.delay-1 { transition-delay: 80ms; }
.delay-2 { transition-delay: 180ms; }

/* ── Responsive ── */
@media (max-width: 1100px) {
  .hero { grid-template-columns: 1fr; gap: 32px; }
  .hero-demo { max-width: 600px; }
  .demo-signals { grid-template-columns: repeat(3, 1fr); }
  .flow-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }
  .flow-arrow { display: none; }
  .cap-grid { grid-template-columns: repeat(2, 1fr); }
  .qs-grid { grid-template-columns: 1fr 1fr; }
  .qs-summary { grid-column: 1 / -1; }
  .config-layout { grid-template-columns: 1fr; }
  .metrics-rail {
    grid-template-columns: 1fr 1fr;
    gap: 0;
  }
  .metric-divider { display: none; }
  .metric-item {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
  }
  .metric-item:nth-child(odd) { border-right: 1px solid var(--border); }
}

@media (max-width: 768px) {
  .site-shell { padding: 0 16px 60px; }
  .site-header { padding: 16px; margin: 0 -16px; }
  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    padding: 12px 16px;
    background: rgba(8, 12, 20, 0.96);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(20px);
  }
  .site-nav.nav-open { display: flex; }
  .nav-toggle { display: flex; }
  .hero { padding: 40px 0 16px; }
  .demo-signals { grid-template-columns: 1fr; }
  .metrics-rail { grid-template-columns: 1fr; }
  .metric-item { border-right: none !important; }
  .section { padding: 24px 20px; }
  .flow-grid { grid-template-columns: 1fr; }
  .mode-grid { grid-template-columns: 1fr; }
  .cap-grid { grid-template-columns: 1fr; }
  .qs-grid { grid-template-columns: 1fr; }
  .res-grid { grid-template-columns: 1fr 1fr; }
  .cta { padding: 32px 24px; }
  .site-footer { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  html[lang="zh-CN"] .hero-title { font-size: clamp(40px, 12vw, 56px); }
  html[lang="en"] .hero-title { font-size: clamp(34px, 10vw, 48px); }
  .res-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: flex-start; }
  .cta-actions { flex-direction: column; align-items: flex-start; }
}