/* ═══════════════════════════════════════════════════════════
   智域 · 人工智能 · 智能制造 · 低空经济 — 样式表
   ═══════════════════════════════════════════════════════════ */

/* ── Reset & Variables ──────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #0a0e1a;
  --bg-card:   #111827;
  --bg-card-h: #1a2236;
  --surface:   #1e293b;
  --border:    #2a3654;
  --text:      #e2e8f0;
  --text-dim:  #94a3b8;
  --text-muted:#64748b;
  --accent:    #6366f1;
  --accent-l:  #818cf8;
  --ai-color:  #6366f1;
  --mfg-color: #10b981;
  --la-color:  #f59e0b;
  --gradient:  linear-gradient(135deg, #6366f1 0%, #10b981 50%, #f59e0b 100%);
  --radius:    12px;
  --radius-sm: 8px;
  --shadow:    0 4px 24px rgba(0,0,0,.4);
  --transition: .3s cubic-bezier(.4,0,.2,1);
}

[data-theme="light"] {
  --bg:       #f1f5f9;
  --bg-card:  #ffffff;
  --bg-card-h:#f8fafc;
  --surface:  #e2e8f0;
  --border:   #cbd5e1;
  --text:     #1e293b;
  --text-dim: #475569;
  --text-muted:#94a3b8;
  --shadow:   0 4px 24px rgba(0,0,0,.08);
}

html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
canvas { display: block; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ── Header ─────────────────────────────────────────────── */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(10,14,26,.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
[data-theme="light"] .header { background: rgba(241,245,249,.88); }

.header-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; height: 64px; gap: 32px;
}

.logo {
  display: flex; align-items: center; gap: 8px;
  font-weight: 700; font-size: 1.1rem; flex-shrink: 0;
}
.logo-icon { font-size: 1.4rem; color: var(--accent-l); }
.logo-tag { font-size: .7rem; color: var(--text-muted); letter-spacing: 2px; text-transform: uppercase; }

.nav { display: flex; gap: 4px; flex: 1; justify-content: center; }
.nav-link {
  padding: 6px 14px; border-radius: var(--radius-sm);
  font-size: .9rem; color: var(--text-dim);
  transition: all var(--transition);
}
.nav-link:hover, .nav-link.active { color: var(--accent-l); background: rgba(99,102,241,.1); }

.theme-toggle {
  width: 36px; height: 36px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; color: var(--text-dim);
  transition: all var(--transition);
}
.theme-toggle:hover { background: var(--surface); color: var(--accent-l); }

.mobile-menu-btn {
  display: none; font-size: 1.4rem; color: var(--text); padding: 4px;
}

/* ── Hero ───────────────────────────────────────────────── */
.hero {
  position: relative; min-height: 100vh;
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  text-align: center; padding: 120px 24px 80px;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(99,102,241,.15) 0%, transparent 70%),
    radial-gradient(ellipse 60% 40% at 70% 60%, rgba(16,185,129,.10) 0%, transparent 60%),
    radial-gradient(ellipse 50% 30% at 20% 70%, rgba(245,158,11,.08) 0%, transparent 50%);
}
#heroBg { animation: heroPulse 8s ease-in-out infinite alternate; }
@keyframes heroPulse {
  0%   { opacity: .6; transform: scale(1); }
  100% { opacity: 1;  transform: scale(1.05); }
}

.hero-content { position: relative; z-index: 1; max-width: 720px; }
.hero-subtitle {
  font-size: .75rem; letter-spacing: 4px; text-transform: uppercase;
  color: var(--accent-l); margin-bottom: 16px;
}
.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800; line-height: 1.2; margin-bottom: 20px;
}
.gradient-text {
  background: var(--gradient); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-desc { font-size: 1.1rem; color: var(--text-dim); margin-bottom: 32px; max-width: 560px; margin-inline: auto; }

.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
  padding: 12px 28px; border-radius: var(--radius); font-weight: 600;
  font-size: .95rem; transition: all var(--transition);
}
.btn-primary {
  background: var(--accent); color: #fff;
  box-shadow: 0 4px 20px rgba(99,102,241,.4);
}
.btn-primary:hover { background: var(--accent-l); transform: translateY(-2px); box-shadow: 0 8px 28px rgba(99,102,241,.5); }
.btn-secondary {
  background: var(--surface); color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent-l); }

.hero-stats {
  position: relative; z-index: 1;
  display: flex; gap: 48px; margin-top: 64px; flex-wrap: wrap; justify-content: center;
}
.hero-stat { text-align: center; }
.hero-stat-value {
  display: block; font-size: 2.2rem; font-weight: 800;
  background: var(--gradient); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-stat-label { font-size: .85rem; color: var(--text-muted); }

/* ── Section ────────────────────────────────────────────── */
.section { padding: 80px 0; }
.section-alt { background: rgba(17,24,39,.5); }
[data-theme="light"] .section-alt { background: rgba(241,245,249,.6); }

.section-header { text-align: center; margin-bottom: 48px; }
.section-title {
  font-size: 2rem; font-weight: 800; margin-bottom: 8px;
  background: var(--gradient); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}
.section-desc { color: var(--text-muted); font-size: 1rem; }

/* ── KPI Grid ───────────────────────────────────────────── */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}
.kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all var(--transition);
  position: relative; overflow: hidden;
}
.kpi-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--gradient); opacity: 0; transition: opacity var(--transition);
}
.kpi-card:hover { border-color: var(--accent); transform: translateY(-4px); box-shadow: var(--shadow); }
.kpi-card:hover::before { opacity: 1; }
.kpi-icon { font-size: 1.6rem; margin-bottom: 12px; }
.kpi-value {
  font-size: 1.8rem; font-weight: 800; margin-bottom: 4px;
  background: var(--gradient); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}
.kpi-label { font-size: .85rem; color: var(--text-muted); margin-bottom: 8px; }
.kpi-change { font-size: .78rem; font-weight: 600; }
.kpi-change.up   { color: #10b981; }
.kpi-change.down { color: #ef4444; }

/* ── Sector Layout ──────────────────────────────────────── */
.sector-layout {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}
.sector-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
}
.sector-card:hover { border-color: var(--accent); transform: translateY(-4px); box-shadow: var(--shadow); }
.card-header {
  display: flex; align-items: center; gap: 12px;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
}
.card-icon { font-size: 1.5rem; }
.card-header h3 { font-size: 1rem; font-weight: 700; }

.icon-ai    { color: var(--ai-color); }
.icon-vision{ color: #a78bfa; }
.icon-agentic{ color: #38bdf8; }
.icon-factory{ color: var(--mfg-color); }
.icon-robot { color: #34d399; }
.icon-iot   { color: #2dd4bf; }
.icon-drone { color: var(--la-color); }
.icon-delivery{ color: #fb923c; }
.icon-utm   { color: #f472b6; }

.card-body { padding: 20px 24px; }
.sparkline { width: 100%; height: 120px; margin-bottom: 16px; }
.card-metrics { display: flex; gap: 24px; }
.metric { flex: 1; }
.metric-value {
  font-size: 1.5rem; font-weight: 800;
  background: var(--gradient); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}
.metric-unit { font-size: .85rem; color: var(--text-muted); }
.metric-label { display: block; font-size: .78rem; color: var(--text-muted); margin-top: 2px; }

/* ── Forecast ───────────────────────────────────────────── */
.forecast-container {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 32px;
}
.forecast-controls { display: flex; gap: 8px; margin-bottom: 20px; flex-wrap: wrap; }
.forecast-btn {
  padding: 8px 20px; border-radius: var(--radius-sm);
  font-size: .85rem; font-weight: 600;
  color: var(--text-dim); border: 1px solid var(--border);
  transition: all var(--transition);
}
.forecast-btn:hover { border-color: var(--accent); color: var(--accent-l); }
.forecast-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.forecast-chart { width: 100%; height: 320px; }
.forecast-legend {
  display: flex; gap: 24px; justify-content: center; margin-top: 16px; flex-wrap: wrap;
}
.legend-item { display: flex; align-items: center; gap: 6px; font-size: .85rem; color: var(--text-dim); }
.legend-dot { width: 10px; height: 10px; border-radius: 50%; }
.dot-ai  { background: var(--ai-color); }
.dot-mfg { background: var(--mfg-color); }
.dot-la  { background: var(--la-color); }

.forecast-insights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.insight-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  transition: all var(--transition);
}
.insight-card:hover { border-color: var(--accent); }
.insight-tag {
  display: inline-block; padding: 2px 10px; border-radius: 20px;
  font-size: .72rem; font-weight: 700; letter-spacing: 1px; text-transform: uppercase;
  background: rgba(99,102,241,.2); color: var(--accent-l); margin-bottom: 10px;
}
.insight-tag.mfg { background: rgba(16,185,129,.2); color: #34d399; }
.insight-tag.la  { background: rgba(245,158,11,.2); color: #fbbf24; }
.insight-card p { font-size: .9rem; color: var(--text-dim); line-height: 1.7; }
.insight-card strong { color: var(--text); }

/* ── Feed ───────────────────────────────────────────────── */
.feed { display: flex; flex-direction: column; gap: 16px; max-width: 800px; margin: 0 auto; }
.feed-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  display: flex; gap: 16px;
  transition: all var(--transition);
  animation: feedIn .5s ease both;
}
@keyframes feedIn {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
.feed-item:hover { border-color: var(--accent); }
.feed-dot {
  width: 10px; height: 10px; border-radius: 50%; margin-top: 6px; flex-shrink: 0;
}
.feed-dot.ai    { background: var(--ai-color); }
.feed-dot.mfg   { background: var(--mfg-color); }
.feed-dot.la    { background: var(--la-color); }
.feed-body { flex: 1; }
.feed-tag {
  display: inline-block; font-size: .7rem; font-weight: 700;
  letter-spacing: 1px; text-transform: uppercase; margin-bottom: 6px;
  padding: 2px 8px; border-radius: 4px;
}
.feed-tag.ai    { background: rgba(99,102,241,.15); color: var(--accent-l); }
.feed-tag.mfg   { background: rgba(16,185,129,.15); color: #34d399; }
.feed-tag.la    { background: rgba(245,158,11,.15); color: #fbbf24; }
.feed-title { font-weight: 700; font-size: .95rem; margin-bottom: 4px; }
.feed-desc  { font-size: .85rem; color: var(--text-muted); }
.feed-time  { font-size: .75rem; color: var(--text-muted); margin-top: 6px; }

/* ── Footer ─────────────────────────────────────────────── */
.footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: 48px 0 24px;
}
.footer-inner {
  display: flex; flex-direction: column; align-items: center;
  gap: 24px; text-align: center;
}
.footer-brand { display: flex; flex-direction: column; align-items: center; gap: 6px; }
.footer-brand p { font-size: .85rem; color: var(--text-muted); }
.footer-links { display: flex; gap: 24px; flex-wrap: wrap; justify-content: center; }
.footer-links a { font-size: .9rem; color: var(--text-dim); transition: color var(--transition); }
.footer-links a:hover { color: var(--accent-l); }
.footer-meta { font-size: .8rem; color: var(--text-muted); }

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 768px) {
  .nav { display: none; }
  .mobile-menu-btn { display: block; }
  .nav.open {
    display: flex; flex-direction: column;
    position: absolute; top: 64px; left: 0; right: 0;
    background: var(--bg-card); border-bottom: 1px solid var(--border);
    padding: 16px; gap: 8px;
  }
  .hero-stats { gap: 24px; }
  .hero-stat-value { font-size: 1.6rem; }
  .sector-layout { grid-template-columns: 1fr; }
}

/* ── Scrollbar ──────────────────────────────────────────── */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }