:root {
  --primary: #2563eb;
  --primary-dark: #004ac6;
  --success: #10b981;
  --warning: #ef4444;
  --ink: #131b2e;
  --muted: #54647a;
  --line: #dbe2f0;
  --soft-line: #eef2f7;
  --surface: #f8fafc;
  --card: #ffffff;
  --blue-soft: #dbeafe;
  --orange: #bc4800;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.06), 0 10px 30px rgba(37, 99, 235, 0.06);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--surface);
  min-width: 320px;
}
a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; }
button { cursor: pointer; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}
.nav {
  max-width: 1200px;
  margin: 0 auto;
  min-height: 68px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0;
}
.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: var(--primary);
  color: white;
  font-weight: 900;
}
.nav-links {
  display: flex;
  gap: 22px;
  align-items: center;
  color: var(--muted);
  font-size: 15px;
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-actions { display: flex; gap: 10px; align-items: center; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.language-select {
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  color: var(--ink);
  padding: 8px 10px;
  font-weight: 800;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 56px 0; }
.hero { padding: 64px 0 48px; }
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 420px;
  gap: 44px;
  align-items: center;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--primary-dark);
  font-weight: 800;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(40px, 6vw, 68px); line-height: 1.02; margin-bottom: 18px; letter-spacing: 0; }
h2 { font-size: clamp(28px, 4vw, 42px); line-height: 1.12; margin-bottom: 14px; letter-spacing: 0; }
h3 { font-size: 20px; line-height: 1.25; margin-bottom: 10px; }
.lead { font-size: 18px; line-height: 1.65; color: var(--muted); max-width: 760px; }
.muted { color: var(--muted); }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.fine { font-size: 13px; color: var(--muted); }

.btn {
  border: 0;
  min-height: 42px;
  border-radius: 8px;
  padding: 10px 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 800;
  background: #eef2f7;
  color: var(--ink);
}
.btn.primary { background: var(--primary); color: white; }
.btn.ghost { background: transparent; border: 1px solid var(--line); }
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}
.panel { padding: 24px; }
.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.tool-card { padding: 22px; transition: transform .2s, box-shadow .2s, border-color .2s; }
.tool-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: #b9c8ee; }
.icon {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  background: var(--blue-soft);
  color: var(--primary);
  margin-bottom: 16px;
  font-size: 24px;
}

.gauge-card { padding: 28px; text-align: center; }
.gauge {
  width: min(320px, 80vw);
  aspect-ratio: 1;
  margin: 0 auto 18px;
  position: relative;
  display: grid;
  place-items: center;
}
.gauge svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.gauge circle { fill: none; stroke-width: 10; stroke-linecap: round; }
.gauge .track { stroke: #e2e8f0; }
.gauge .progress { stroke: var(--primary); stroke-dasharray: 283; stroke-dashoffset: 283; transition: stroke-dashoffset .3s ease; }
.gauge-center { position: absolute; inset: 0; display: grid; place-items: center; }
.speed-value { font-size: 56px; font-weight: 900; color: var(--primary-dark); line-height: 1; }
.speed-unit { color: var(--muted); font-weight: 700; }
.metric { padding: 18px; }
.metric b { display: block; font-size: 28px; margin-top: 6px; }
.status-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #f8fafc;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}
.dot { width: 8px; height: 8px; border-radius: 999px; background: var(--success); box-shadow: 0 0 0 5px rgba(16, 185, 129, .12); }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; min-width: 650px; }
th, td { text-align: left; padding: 14px 12px; border-bottom: 1px solid var(--soft-line); }
th { color: var(--muted); text-transform: uppercase; font-size: 12px; letter-spacing: .05em; }
tr:hover td { background: #f8fbff; }

.tabs, .filters { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.tab, .filter {
  border: 1px solid var(--line);
  background: white;
  color: var(--muted);
  border-radius: 8px;
  padding: 9px 13px;
  font-weight: 800;
}
.tab.active, .filter.active { color: white; border-color: var(--primary); background: var(--primary); }

.input-row { display: flex; gap: 10px; }
.input, select {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  padding: 10px 12px;
  color: var(--ink);
}
.input:focus, select:focus { outline: 3px solid rgba(37, 99, 235, .14); border-color: var(--primary); }

.map {
  min-height: 320px;
  background:
    linear-gradient(90deg, rgba(37,99,235,.05) 1px, transparent 1px),
    linear-gradient(rgba(37,99,235,.05) 1px, transparent 1px),
    #ffffff;
  background-size: 34px 34px;
  position: relative;
  overflow: hidden;
}
.map-point {
  position: absolute;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 0 10px rgba(37,99,235,.12);
}
.chart-bars {
  display: grid;
  grid-template-columns: repeat(12, minmax(12px, 1fr));
  align-items: end;
  gap: 8px;
  min-height: 180px;
}
.chart-bars span {
  display: block;
  border-radius: 6px 6px 0 0;
  background: linear-gradient(180deg, #2563eb, #10b981);
  min-height: 24px;
}
.mini-map {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}
.mini-map span {
  min-height: 44px;
  border-radius: 8px;
  background: #dbeafe;
  border: 1px solid #bfdbfe;
}
.mini-map span.hot { background: #2563eb; }
.bar { height: 8px; border-radius: 999px; background: #e2e8f0; overflow: hidden; }
.bar span { display: block; height: 100%; background: var(--primary); border-radius: inherit; }
.ad-slot {
  border: 1px dashed #b8c2d6;
  color: var(--muted);
  background: #f7f9fd;
  min-height: 90px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  font-size: 13px;
  text-align: center;
}
.risk { background: #fff1f2; border-color: #fecdd3; }
.success { color: var(--success); }
.danger { color: var(--warning); }
.footer { padding: 42px 0; border-top: 1px solid var(--line); background: white; }
.footer-grid { display: grid; grid-template-columns: 1.5fr repeat(3, 1fr); gap: 24px; }
.footer a { display: block; color: var(--muted); margin: 8px 0; font-size: 14px; }

@media (max-width: 900px) {
  .hero-grid, .grid-3, .grid-4, .footer-grid { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .nav { padding: 0 16px; }
  .nav-links { display: none; }
  .container { padding: 0 16px; }
  .section { padding: 40px 0; }
  .hero { padding: 42px 0; }
  .input-row { flex-direction: column; }
  .speed-value { font-size: 46px; }
}