/* 次幕AI 对比落地页共享样式（深色品牌风，独立于 SPA） */
:root {
  --cimu-cyan: #22d3ee;
  --cimu-green: #4ade80;
  --bg-card: rgba(255, 255, 255, 0.05);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.72);
  --text-tertiary: rgba(255, 255, 255, 0.5);
  --border: rgba(255, 255, 255, 0.1);
  --gradient-brand: linear-gradient(135deg, #22d3ee 0%, #22d3ee 40%, #4ade80 100%);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background: linear-gradient(160deg, #1a1a2e 0%, #16213e 100%);
  background-attachment: fixed;
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  line-height: 1.75;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

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

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 顶栏 */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.topbar .brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 20px;
  font-weight: 700;
  color: #fff;
}
.topbar .brand .dot {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  background: var(--gradient-brand);
}
.topbar nav a {
  color: var(--text-secondary);
  font-size: 14px;
  margin-left: 18px;
}

/* Hero */
.hero {
  padding: 36px 0 20px;
}
.hero .eyebrow {
  display: inline-block;
  font-size: 13px;
  color: var(--cimu-cyan);
  background: rgba(34, 211, 238, 0.12);
  border: 1px solid rgba(34, 211, 238, 0.3);
  border-radius: 999px;
  padding: 4px 12px;
  margin-bottom: 16px;
}
.hero h1 {
  font-size: 34px;
  font-weight: 800;
  letter-spacing: 0.5px;
  line-height: 1.35;
  margin-bottom: 16px;
}
.hero .lead {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 760px;
}

/* 段落区块 */
section {
  margin: 36px 0;
}
h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-left: 12px;
  border-left: 4px solid var(--cimu-cyan);
}
h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 18px 0 8px;
  color: #fff;
}
p {
  color: var(--text-secondary);
  margin-bottom: 14px;
}
strong {
  color: #fff;
}

/* 两栏定位卡 */
.vs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  transition: background 0.2s;
}
.card:hover {
  background: var(--bg-card-hover);
}
.card.highlight {
  border-color: rgba(34, 211, 238, 0.4);
  box-shadow: 0 8px 32px rgba(34, 211, 238, 0.12);
}
.card h3 {
  margin-top: 0;
}
.card ul {
  list-style: none;
  margin-top: 10px;
}
.card li {
  color: var(--text-secondary);
  font-size: 14px;
  padding: 5px 0 5px 22px;
  position: relative;
}
.card li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--cimu-green);
  font-weight: 700;
}

/* 对比表 */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  border-radius: 16px;
  border: 1px solid var(--border);
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 520px;
}
th,
td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
thead th {
  background: rgba(255, 255, 255, 0.04);
  color: #fff;
  font-weight: 600;
}
thead th:nth-child(2) {
  color: var(--cimu-cyan);
}
tbody td {
  color: var(--text-secondary);
}
tbody td:first-child {
  color: #fff;
  font-weight: 500;
}
tbody tr:last-child td {
  border-bottom: none;
}

/* FAQ */
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
  margin-bottom: 12px;
}
.faq-item h3 {
  margin: 0 0 6px;
  font-size: 16px;
  color: var(--cimu-cyan);
}
.faq-item p {
  margin: 0;
  font-size: 14px;
}

/* CTA */
.cta {
  text-align: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 40px 24px;
  margin: 48px 0;
}
.cta h2 {
  border: none;
  padding: 0;
  font-size: 26px;
  margin-bottom: 12px;
}
.cta p {
  margin-bottom: 24px;
}
.cta-btn {
  display: inline-block;
  background: var(--gradient-brand);
  color: #fff !important;
  font-size: 17px;
  font-weight: 600;
  padding: 14px 44px;
  border-radius: 28px;
  box-shadow: 0 8px 32px rgba(34, 211, 238, 0.35);
  transition: transform 0.2s, box-shadow 0.2s;
}
.cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(34, 211, 238, 0.5);
  text-decoration: none;
}

/* hub 列表 */
.hub-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.hub-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 22px;
  color: #fff !important;
  transition: all 0.2s;
}
.hub-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(34, 211, 238, 0.4);
  transform: translateY(-3px);
  text-decoration: none;
}
.hub-card .h {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}
.hub-card .d {
  font-size: 14px;
  color: var(--text-secondary);
}

/* 页脚 */
.footer {
  border-top: 1px solid var(--border);
  margin-top: 56px;
  padding: 28px 0 40px;
  text-align: center;
  color: var(--text-tertiary);
  font-size: 13px;
}
.footer a {
  color: var(--text-tertiary);
}

/* 响应式 */
@media (max-width: 640px) {
  .hero h1 {
    font-size: 26px;
  }
  .hero .lead {
    font-size: 15px;
  }
  .vs-grid,
  .hub-grid {
    grid-template-columns: 1fr;
  }
  h2 {
    font-size: 21px;
  }
}