:root {
  --bg: #f6f9fc;
  --panel: rgba(255, 255, 255, 0.84);
  --panel-strong: #ffffff;
  --text: #13202d;
  --muted: #5d7184;
  --line: rgba(28, 63, 94, 0.12);
  --accent: #2e7af0;
  --accent-2: #2fd3a6;
  --shadow: 0 24px 60px rgba(44, 77, 110, 0.10);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: radial-gradient(circle at top left, rgba(47, 211, 166, 0.18), transparent 35%),
              radial-gradient(circle at top right, rgba(46, 122, 240, 0.16), transparent 32%),
              linear-gradient(180deg, #fbfdff 0%, var(--bg) 100%);
  color: var(--text);
  line-height: 1.65;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.shell {
  width: min(1120px, calc(100% - 32px));
  margin: 24px auto 48px;
}

.topbar {
  position: sticky;
  top: 12px;
  z-index: 10;
  backdrop-filter: blur(16px);
  background: rgba(255,255,255,0.72);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.35);
  flex: none;
}

.brand-title {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0;
}

.brand-subtitle {
  margin: 2px 0 0;
  font-size: 13px;
  color: var(--muted);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: flex-end;
}

.nav a, .lang-switch button, .button {
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.84);
  color: var(--text);
  border-radius: 999px;
  padding: 10px 14px;
  font-weight: 650;
  font-size: 14px;
}

.nav a:hover, .lang-switch button:hover, .button:hover {
  text-decoration: none;
  border-color: rgba(46,122,240,0.28);
  box-shadow: 0 8px 22px rgba(46,122,240,0.10);
}

.nav a.active {
  background: linear-gradient(135deg, rgba(46,122,240,0.14), rgba(47,211,166,0.14));
  border-color: rgba(46,122,240,0.24);
}

.hero, .card, .section {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.hero {
  margin-top: 22px;
  padding: 34px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  font-weight: 800;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hero h1 {
  font-size: clamp(40px, 6vw, 66px);
  line-height: 1.02;
  margin: 14px 0 12px;
  letter-spacing: -0.04em;
}

.hero p {
  margin: 0;
  font-size: 18px;
  color: var(--muted);
  max-width: 780px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  margin-top: 18px;
}

.card {
  padding: 22px;
}

.span-6 { grid-column: span 6; }
.span-12 { grid-column: span 12; }

.card h2, .section h2 {
  margin: 0 0 10px;
  font-size: 24px;
  letter-spacing: -0.02em;
}

.card h3, .section h3 {
  margin: 18px 0 8px;
  font-size: 18px;
}

.muted { color: var(--muted); }

.list {
  margin: 0;
  padding-left: 20px;
}

.list li { margin: 8px 0; }

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 10px;
}

.pill {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 8px 12px;
  background: rgba(46, 122, 240, 0.10);
  color: #1f5ebf;
  font-weight: 700;
  font-size: 13px;
}

.section {
  margin-top: 18px;
  padding: 24px 26px;
}

.lang-switch {
  display: inline-flex;
  gap: 8px;
  padding: 4px;
  border-radius: 999px;
  background: rgba(18, 32, 45, 0.05);
}

.lang-switch button.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
  border-color: transparent;
}

[data-lang] { display: none; }
html[data-lang="en"] [data-lang="en"],
html[data-lang="zh"] [data-lang="zh"] { display: block; }
html[data-lang="en"] span[data-lang="en"],
html[data-lang="zh"] span[data-lang="zh"] { display: inline; }

table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border-radius: 18px;
  margin-top: 10px;
}

th, td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  font-size: 14px;
}

th {
  background: rgba(46,122,240,0.08);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.footer {
  margin: 18px 0 12px;
  padding: 14px 2px 0;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 820px) {
  .shell { width: min(100% - 20px, 1120px); margin-top: 12px; }
  .topbar { padding: 12px 14px; border-radius: 18px; }
  .hero { padding: 26px 20px; }
  .span-6 { grid-column: span 12; }
  .nav { justify-content: flex-start; }
}