/* 首页 + 共享导航栏 */

/* ---------- 共享站点导航栏 ---------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--separator);
}
.site-nav-inner {
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 24px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.site-nav-brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 18px;
  font-weight: 600;
  color: var(--label);
  letter-spacing: -0.2px;
}
.site-nav-brand:hover { text-decoration: none; }
.site-nav-brand svg { width: 22px; height: 22px; }

.site-nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.site-nav-links a {
  font-size: 14px;
  color: var(--secondary-label);
  padding: 7px 12px;
  border-radius: var(--r-sm);
  transition: color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}
.site-nav-links a:hover {
  color: var(--label);
  text-decoration: none;
  background: var(--fill-secondary);
}
.site-nav-links a.active {
  color: var(--label);
  font-weight: 500;
}
.site-nav-links a.site-nav-cta {
  background: var(--primary);
  color: #fff;
  font-weight: 500;
  margin-left: 6px;
  padding: 7px 15px;
}
.site-nav-links a.site-nav-cta:hover {
  background: var(--primary-pressed);
  color: #fff;
}

/* ---------- 首页主体 ---------- */
.home-main {
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 24px 96px;
}

/* Hero */
.hero {
  text-align: center;
  padding: 96px 0 80px;
}
.hero-title {
  font-size: 56px;
  font-weight: 700;
  letter-spacing: -1.2px;
  line-height: 1.08;
  color: var(--label);
  margin-bottom: 22px;
}
.hero-sub {
  font-size: 17px;
  line-height: 1.6;
  color: var(--secondary-label);
  max-width: 640px;
  margin: 0 auto 36px;
}
.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}
.hero .btn { min-width: 160px; height: 48px; font-size: 16px; }

/* 介绍卡片 */
.intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 88px;
}
.intro-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--r-lg);
  padding: 32px;
  box-shadow: var(--shadow-card);
}
.intro-card h3 {
  font-size: 21px;
  font-weight: 600;
  letter-spacing: -0.2px;
  margin: 0 0 12px;
  color: var(--label);
  display: flex;
  align-items: center;
  gap: 12px;
}
.intro-card .intro-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--r-md);
  background: var(--surface);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--primary);
}
.intro-card .intro-icon svg { width: 22px; height: 22px; }
.intro-card p {
  font-size: 15px;
  line-height: 1.65;
  color: var(--secondary-label);
  margin: 0;
}

/* 接入方式区 */
.integration {
  border-top: 1px solid var(--separator);
  padding-top: 80px;
}
.integration-head {
  text-align: center;
  margin-bottom: 44px;
}
.integration-head h2 {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.6px;
  margin: 0 0 12px;
  color: var(--label);
}
.integration-head p {
  font-size: 16px;
  color: var(--secondary-label);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.6;
}

.mode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 48px;
}
.mode-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--r-lg);
  padding: 28px 28px 24px;
  box-shadow: var(--shadow-card);
}
.mode-card .mode-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.2px;
  color: var(--primary);
  background: rgba(0, 122, 255, 0.1);
  padding: 4px 10px;
  border-radius: var(--r-pill);
  margin-bottom: 14px;
}
.mode-card h3 {
  font-size: 20px;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--label);
}
.mode-card > p {
  font-size: 14px;
  color: var(--secondary-label);
  margin: 0 0 16px;
  line-height: 1.55;
}
.mode-card ul {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
}
.mode-card li {
  font-size: 14px;
  color: var(--label);
  padding: 9px 12px;
  border: 1px solid var(--card-border);
  border-radius: var(--r-sm);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 9px;
  background: var(--background);
}
.mode-card li::before {
  content: "";
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  border-radius: 50%;
  border: 1.5px solid var(--separator);
  background: var(--background);
}
.mode-card li li-default::before,
.mode-card li.default::before {
  border-color: var(--primary);
  background: var(--primary);
  box-shadow: inset 0 0 0 2.5px var(--background);
}
.mode-card li.checkbox::before {
  border-radius: 4px;
}
.mode-card li.checkbox.default::before {
  border-radius: 4px;
}
.mode-card .mode-note {
  font-size: 13px;
  color: var(--tertiary-label);
  margin: 0;
  line-height: 1.55;
  padding-top: 4px;
  border-top: 1px solid var(--separator);
  padding-top: 14px;
}

/* 三个选项说明 */
.option-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}
.option-card {
  background: var(--surface);
  border-radius: var(--r-md);
  padding: 22px 20px;
}
.option-card h4 {
  font-size: 15px;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--label);
  display: flex;
  align-items: center;
  gap: 8px;
}
.option-card h4 .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  flex-shrink: 0;
}
.option-card h4 .dot.muted { background: var(--tertiary-label); }
.option-card h4 .dot.warn { background: var(--warning); }
.option-card p {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--secondary-label);
  margin: 0;
}
.option-note {
  text-align: center;
  font-size: 13px;
  color: var(--tertiary-label);
  margin: 0;
}

/* 页脚 */
.site-footer {
  border-top: 1px solid var(--separator);
  padding: 28px 24px;
  text-align: center;
  font-size: 13px;
  color: var(--tertiary-label);
}
.site-footer a {
  color: var(--tertiary-label);
  margin: 0 8px;
}
.site-footer a:hover { color: var(--label); }

/* 响应式 */
@media (max-width: 767px) {
  .hero { padding: 60px 0 56px; }
  .hero-title { font-size: 38px; letter-spacing: -0.8px; }
  .hero-sub { font-size: 15px; }
  .intro-grid,
  .mode-grid { grid-template-columns: 1fr; }
  .option-grid { grid-template-columns: 1fr; }
  .integration-head h2 { font-size: 26px; }
  .site-nav-links a { padding: 7px 9px; font-size: 13px; }
}

@media (prefers-color-scheme: dark) {
  .site-nav {
    background: rgba(28, 28, 30, 0.72);
  }
  .hero-title { color: #f5f5f7; }
  .mode-card li { background: var(--surface); }
}