:root {
  --ink: #182033;
  --muted: #667085;
  --line: #d9dde7;
  --paper: #f7f9fc;
  --accent: #0f766e;
  --accent-2: #b7791f;
  --white: #ffffff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.6;
}

a { color: inherit; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 16px clamp(18px, 5vw, 72px);
  border-bottom: 1px solid rgba(24, 32, 51, 0.08);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
}

.brand {
  font-weight: 800;
  letter-spacing: 0;
}

.nav {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 14px;
}

.lang {
  display: flex;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}

.lang button {
  border: 0;
  background: transparent;
  padding: 7px 10px;
  cursor: pointer;
  color: var(--muted);
  font: inherit;
}

.lang button.active {
  background: var(--ink);
  color: var(--white);
}

.hero {
  min-height: 78vh;
  display: grid;
  align-items: center;
  padding: 72px clamp(18px, 6vw, 88px) 56px;
  background:
    linear-gradient(115deg, rgba(247, 249, 252, 0.95), rgba(240, 247, 245, 0.82)),
    url("https://images.unsplash.com/photo-1517048676732-d65bc937f952?auto=format&fit=crop&w=1800&q=80");
  background-size: cover;
  background-position: center;
}

.hero-inner {
  max-width: 920px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-weight: 800;
  text-transform: uppercase;
  font-size: 13px;
  letter-spacing: 0.08em;
}

h1 {
  margin: 0;
  font-size: clamp(42px, 7vw, 86px);
  line-height: 0.98;
  letter-spacing: 0;
  max-width: 980px;
}

.lead {
  max-width: 780px;
  margin: 24px 0 0;
  font-size: clamp(18px, 2vw, 24px);
  color: #2f3b52;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 18px;
  border-radius: 8px;
  border: 1px solid var(--ink);
  text-decoration: none;
  font-weight: 700;
}

.button.primary {
  background: var(--ink);
  color: var(--white);
}

main section {
  padding: 54px clamp(18px, 6vw, 88px);
}

.section-title {
  max-width: 980px;
  margin: 0 0 26px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.08;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 22px;
  background: var(--white);
}

.card h3 {
  margin: 0 0 8px;
  font-size: 19px;
}

.card p, .card li { color: var(--muted); }

.band {
  background: var(--paper);
}

.timeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}

.time-block {
  padding: 22px;
  border-right: 1px solid var(--line);
}

.time-block:last-child { border-right: 0; }

.date {
  color: var(--accent-2);
  font-weight: 800;
}

.placeholder {
  min-height: 54vh;
  display: grid;
  align-items: center;
  background: var(--paper);
}

.placeholder-box {
  max-width: 820px;
}

footer {
  padding: 32px clamp(18px, 6vw, 88px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

[data-lang="en"] .zh,
[data-lang="zh"] .en { display: none; }

@media (max-width: 800px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav { flex-wrap: wrap; }
  .grid, .timeline { grid-template-columns: 1fr; }
  .time-block { border-right: 0; border-bottom: 1px solid var(--line); }
  .time-block:last-child { border-bottom: 0; }
}