:root {
  --bg: #f3f7fb;
  --surface: #ffffff;
  --surface-alt: #eaf1f8;
  --text: #11223a;
  --muted: #4f6179;
  --primary: #0062ff;
  --primary-soft: #dce9ff;
  --accent: #00b894;
  --border: #d5e1ef;
  --shadow: 0 16px 40px rgba(13, 38, 76, 0.12);
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --container: 1160px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Segoe UI", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 10% -10%, #d6e5ff 0%, transparent 45%),
    radial-gradient(circle at 100% 10%, #ddfff7 0%, transparent 35%),
    var(--bg);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: min(var(--container), 92vw);
  margin: 0 auto;
}

.page-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background: rgba(243, 247, 251, 0.86);
  border-bottom: 1px solid rgba(213, 225, 239, 0.9);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(145deg, var(--primary), #2aa9ff);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 800;
}

.brand-text {
  display: grid;
  line-height: 1.1;
}

.brand-text small {
  color: var(--muted);
  font-weight: 500;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.nav a {
  padding: 10px 14px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 600;
}

.nav a:hover,
.nav a.active {
  background: var(--primary-soft);
  color: var(--primary);
}

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
  background: #fff;
}

.lang-switch button {
  border: 0;
  background: transparent;
  padding: 8px 12px;
  font-weight: 700;
  color: var(--muted);
  cursor: pointer;
}

.lang-switch button.is-active {
  background: var(--text);
  color: #fff;
}

.hero {
  padding: 80px 0 52px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
  align-items: stretch;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.hero h1 {
  font-size: clamp(2rem, 3.5vw, 3.4rem);
  line-height: 1.1;
  margin: 0 0 14px;
}

.lead {
  color: var(--muted);
  font-size: 1.08rem;
  margin: 0 0 24px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: 12px;
  font-weight: 700;
  padding: 12px 18px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 10px 26px rgba(0, 98, 255, 0.28);
}

.btn-secondary {
  background: #fff;
  border-color: var(--border);
  color: var(--text);
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.metric {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
}

.metric strong {
  display: block;
  font-size: 1.5rem;
}

.metric span {
  color: var(--muted);
  font-size: 0.9rem;
}

.section {
  padding: 26px 0;
}

.section-title {
  margin: 0 0 14px;
  font-size: clamp(1.5rem, 2vw, 2rem);
}

.section-sub {
  margin: 0 0 20px;
  color: var(--muted);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.info-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.info-card h3 {
  margin: 0 0 10px;
  font-size: 1.1rem;
}

.info-card p,
.info-card li {
  margin: 0;
  color: var(--muted);
}

.list {
  margin: 0;
  padding-left: 18px;
}

.banner {
  margin: 20px 0;
  background: linear-gradient(120deg, #0d2754, #12458e);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 26px;
}

.banner p {
  margin: 8px 0 0;
  color: rgba(255, 255, 255, 0.86);
}

.page-content {
  padding: 36px 0 60px;
}

.article {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow);
}

.article h1,
.article h2 {
  margin-top: 0;
}

.article h2 {
  margin-top: 20px;
  font-size: 1.2rem;
}

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

.article ul {
  margin-top: 8px;
  padding-left: 20px;
}

.site-footer {
  margin-top: 40px;
  padding: 30px 0;
  border-top: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.75);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 18px;
}

.footer-title {
  margin: 0 0 8px;
  font-size: 1rem;
}

.footer-note,
.footer-link,
.footer-contact {
  color: var(--muted);
  margin: 0;
}

.footer-links {
  display: grid;
  gap: 8px;
}

@media (max-width: 980px) {
  .hero-grid,
  .grid-3,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .header-inner {
    flex-wrap: wrap;
    padding: 10px 0;
  }

  .nav {
    order: 3;
    width: 100%;
  }

  .nav a {
    flex: 1 1 auto;
    text-align: center;
  }
}

@media (max-width: 620px) {
  .card,
  .article,
  .banner,
  .info-card {
    padding: 20px;
  }

  .hero {
    padding-top: 56px;
  }
}