/* 基础变量 */
:root {
  --bg: #0b1220;
  --bg-soft: #0f172a;
  --card: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.12);
  --text: #e6ebf5;
  --muted: #a9b4cc;
  --brand: #7aa2ff;
  --accent: #ffd166;
  --danger: #ff677d;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  color: var(--text);
  background: linear-gradient(
    160deg,
    var(--bg) 0%,
    var(--bg-soft) 55%,
    var(--bg) 100%
  );
  padding-top: 64px;
  font: 400 16px/1.6 "Inter", system-ui, -apple-system, Segoe UI, Roboto,
    PingFang SC, Microsoft YaHei, Helvetica, Arial, "Apple Color Emoji",
    "Segoe UI Emoji";
}

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

/* 导航 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  z-index: 100;
  backdrop-filter: saturate(150%) blur(10px);
  background: rgba(11, 18, 32, 0.6);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
}
.brand.small span {
  font-weight: 600;
  font-size: 14px;
}
.nav-toggle {
  display: none;
  padding: 8px 12px;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
}
.nav-links {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 18px;
  align-items: center;
}
.nav-links a {
  color: var(--muted);
  text-decoration: none;
  padding: 8px 10px;
  border-radius: 10px;
  transition: color 0.2s, background 0.2s;
}
.nav-links a:hover {
  color: var(--text);
  background: var(--card);
}
.nav-links .cta {
  color: #0b1220;
  background: linear-gradient(135deg, var(--accent), #ffdca0);
  padding: 10px 14px;
  border-radius: 12px;
  font-weight: 600;
}

/* 英雄区 */
.hero {
  padding: 96px 0 64px;
  position: relative;
}
.hero:before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    800px 500px at 30% 0%,
    rgba(122, 162, 255, 0.18),
    transparent 50%
  );
  pointer-events: none;
}
.hero-content {
  display: grid;
  gap: 18px;
  text-align: left;
}
.hero h1 {
  margin: 0;
  font-size: clamp(28px, 3.8vw, 48px);
  line-height: 1.15;
  letter-spacing: 0.2px;
}
.subtitle {
  color: var(--muted);
  font-size: 18px;
}
.hero-ctas {
  display: flex;
  gap: 14px;
  margin-top: 6px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 18px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 600;
  border: 1px solid var(--border);
  color: var(--text);
  background: var(--card);
}
.btn.primary {
  border: none;
  background: linear-gradient(135deg, #6da8ff, #5dd6ff);
  color: #0b1220;
}
.btn.ghost {
  background: transparent;
}
.hero-highlights {
  display: flex;
  gap: 12px;
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  color: var(--muted);
}
.hero-highlights li {
  padding: 6px 10px;
  border: 1px dashed var(--border);
  border-radius: 10px;
}

/* 通用区块 */
.section {
  padding: 64px 0;
}
.section h2 {
  margin: 0 0 18px;
  font-size: clamp(22px, 2.6vw, 32px);
}
.section,
.hero,
[id] {
  scroll-margin-top: 72px;
}
.cards {
  display: grid;
  gap: 16px;
}
.cards.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.cards.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}
.card h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 12px;
}
.stat {
  background: linear-gradient(
    180deg,
    rgba(122, 162, 255, 0.1),
    rgba(122, 162, 255, 0)
  );
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}
.stat-value {
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 700;
}
.stat-label {
  color: var(--muted);
  font-size: 14px;
}

.list {
  margin: 0;
  padding-left: 18px;
}
.steps {
  margin: 0;
  padding-left: 22px;
}

.contact .contact-card {
  display: grid;
  gap: 14px;
  background: linear-gradient(
    180deg,
    rgba(255, 209, 102, 0.08),
    rgba(255, 209, 102, 0)
  );
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
}
.contact-item {
  display: flex;
  gap: 10px;
  align-items: center;
}
.contact-item .label {
  width: 48px;
  color: var(--muted);
}

.contact-item a {
  color: white;
}

.contact-cta {
  display: flex;
  gap: 12px;
  margin-top: 6px;
}
.slogan {
  color: var(--muted);
  margin-top: 10px;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: rgba(11, 18, 32, 0.7);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

/* 响应式 */
@media (max-width: 960px) {
  .cards.two {
    grid-template-columns: 1fr;
  }
  .cards.three {
    grid-template-columns: 1fr;
  }
  .stats {
    grid-template-columns: 1fr;
  }
  .nav-toggle {
    display: inline-flex;
  }
  .nav-links {
    display: none;
    position: absolute;
    right: 4%;
    top: 68px;
    flex-direction: column;
    gap: 8px;
    padding: 10px;
    background: var(--bg-soft);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: var(--shadow);
  }
  .nav-links.show {
    display: flex;
  }
}

/* 动效 */
@media (prefers-reduced-motion: no-preference) {
  .btn,
  .card,
  .stat {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
  }
  .card:hover,
  .stat:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 36px rgba(0, 0, 0, 0.45);
  }
}

/* 可访问性微调 */
a:focus,
button:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}