/* ===== 阿拉·AI数智 · 浅色科技风 ===== */
:root {
  --bg: #f5f8ff;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.82);
  --bg-card-hover: #eef4ff;
  --border: rgba(99, 102, 241, 0.14);
  --border-strong: rgba(99, 102, 241, 0.30);
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #8a98ad;

  --cyan: #0ea5e9;
  --indigo: #6366f1;
  --violet: #8b5cf6;
  --teal: #0e7c8a;
  --orange: #f08c2e;
  --green: #2ea36d;
  --pink: #ec4899;

  --gradient-primary: linear-gradient(135deg, #0ea5e9 0%, #6366f1 52%, #8b5cf6 100%);
  --gradient-soft: linear-gradient(135deg, rgba(14, 165, 233, 0.10) 0%, rgba(99, 102, 241, 0.10) 50%, rgba(139, 92, 246, 0.10) 100%);
  --gradient-accent: linear-gradient(135deg, #ec4899 0%, #f08c2e 100%);

  --radius: 18px;
  --radius-sm: 10px;
  --shadow: 0 10px 32px rgba(30, 64, 175, 0.10);
  --shadow-lg: 0 20px 50px rgba(30, 64, 175, 0.16);
  --glow: 0 6px 20px rgba(99, 102, 241, 0.22);
  --glow-cyan: 0 6px 20px rgba(14, 165, 233, 0.22);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  /* 科技感：细网格 + 柔光晕 */
  background-image:
    radial-gradient(ellipse 70% 40% at 15% -5%, rgba(14, 165, 233, 0.12) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 90% 0%, rgba(139, 92, 246, 0.12) 0%, transparent 60%),
    linear-gradient(rgba(99, 102, 241, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99, 102, 241, 0.045) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 44px 44px, 44px 44px;
  background-attachment: fixed;
}

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

/* ===== 顶部导航 ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--border);
}

.navbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 20px;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-icon {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  -webkit-text-fill-color: #fff;
  box-shadow: var(--glow);
}

.nav-links {
  display: flex;
  gap: 6px;
  align-items: center;
}

.nav-link {
  padding: 8px 16px;
  border-radius: 9px;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
  cursor: pointer;
}

.nav-link:hover,
.nav-link.active {
  color: var(--indigo);
  background: rgba(99, 102, 241, 0.09);
}

.nav-actions {
  display: flex;
  gap: 12px;
  align-items: center;
}

/* ===== 按钮 ===== */
.btn {
  padding: 10px 22px;
  border-radius: 11px;
  border: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.22s;
  font-family: inherit;
  letter-spacing: 0.3px;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: var(--glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(99, 102, 241, 0.42);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.7);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  backdrop-filter: blur(8px);
}

.btn-ghost:hover {
  background: rgba(99, 102, 241, 0.08);
  border-color: var(--indigo);
  color: var(--indigo);
}

.btn-lg {
  padding: 14px 34px;
  font-size: 16px;
  border-radius: 13px;
}

.btn-sm {
  padding: 6px 15px;
  font-size: 13px;
}

/* ===== 容器 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Hero 区 ===== */
.hero {
  padding: 84px 0 56px;
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 18px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid var(--border-strong);
  color: var(--indigo);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 26px;
  box-shadow: 0 2px 12px rgba(99, 102, 241, 0.10);
  backdrop-filter: blur(8px);
}

.hero h1 {
  font-size: 54px;
  font-weight: 800;
  line-height: 1.18;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
  background: linear-gradient(120deg, #0ea5e9 0%, #6366f1 45%, #8b5cf6 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 620px;
  margin: 0 auto 34px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-hint {
  margin-top: 20px;
  font-size: 13px;
  color: var(--text-muted);
}

/* Hero 装饰光点 */
.hero-dots {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.hero-dot {
  position: absolute;
  border-radius: 50%;
  background: var(--gradient-primary);
  opacity: 0.35;
  filter: blur(2px);
  animation: float 6s ease-in-out infinite;
}

.hero-dot:nth-child(1) { width: 10px; height: 10px; top: 18%; left: 12%; }
.hero-dot:nth-child(2) { width: 6px; height: 6px; top: 30%; right: 16%; animation-delay: -2s; }
.hero-dot:nth-child(3) { width: 14px; height: 14px; bottom: 22%; left: 20%; opacity: 0.22; animation-delay: -4s; }
.hero-dot:nth-child(4) { width: 8px; height: 8px; top: 55%; right: 10%; animation-delay: -1s; }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}

/* ===== 数据统计 ===== */
.stats {
  display: flex;
  justify-content: center;
  gap: 64px;
  padding: 38px 24px;
  margin: 0 auto 56px;
  max-width: 880px;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: 34px;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  color: var(--text-muted);
  font-size: 13px;
  margin-top: 2px;
}

/* ===== 价值主张 ===== */
.value-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.value-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 22px;
  backdrop-filter: blur(10px);
  transition: all 0.28s;
  position: relative;
  overflow: hidden;
}

.value-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--vc, #6366f1);
  opacity: 0;
  transition: opacity 0.28s;
}

.value-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow);
}

.value-card:hover::before {
  opacity: 1;
}

.value-icon {
  width: 48px;
  height: 48px;
  border-radius: 13px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 16px;
  color: var(--vc, #6366f1);
}

.value-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.value-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ===== 注册引导横幅 ===== */
.signup-banner {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  padding: 44px 40px;
  text-align: center;
  background: var(--gradient-primary);
  box-shadow: 0 18px 44px rgba(99, 102, 241, 0.30);
}

.signup-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.16) 0%, transparent 45%),
    radial-gradient(circle at 85% 80%, rgba(255, 255, 255, 0.12) 0%, transparent 45%);
  pointer-events: none;
}

.signup-title {
  font-size: 28px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 10px;
}

.signup-desc {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.92);
  margin-bottom: 26px;
}

.signup-points {
  display: flex;
  justify-content: center;
  gap: 28px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.signup-point {
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-signup {
  background: #fff;
  color: var(--indigo);
  padding: 13px 36px;
  font-size: 16px;
  border-radius: 13px;
  font-weight: 700;
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.18);
}

.btn-signup:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.24);
}

/* ===== 分类导航 ===== */
.category-nav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

.category-item {
  padding: 10px 22px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  backdrop-filter: blur(8px);
}

.category-item:hover {
  border-color: var(--indigo);
  color: var(--indigo);
  background: rgba(99, 102, 241, 0.08);
  transform: translateY(-2px);
}

/* ===== 区块标题 ===== */
.section {
  padding: 44px 0;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
}

.section-title {
  font-size: 26px;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-title::before {
  content: "";
  width: 5px;
  height: 26px;
  background: var(--gradient-primary);
  border-radius: 3px;
}

.section-sub {
  color: var(--text-muted);
  font-size: 14px;
  margin-top: -16px;
  margin-bottom: 28px;
}

.section-more {
  color: var(--indigo);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.section-more:hover {
  text-decoration: underline;
}

/* ===== 文章卡片 ===== */
.grid {
  display: grid;
  gap: 24px;
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  transition: all 0.28s;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity 0.28s;
}

.card:hover {
  background: #ffffff;
  border-color: var(--border-strong);
  transform: translateY(-5px);
  box-shadow: var(--shadow);
}

.card:hover::after {
  opacity: 1;
}

.card-tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 7px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 14px;
  background: rgba(99, 102, 241, 0.10);
  color: var(--indigo);
}

.card-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
  line-height: 1.45;
  color: var(--text-primary);
}

.card-summary {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 18px;
  font-size: 12px;
  color: var(--text-muted);
}

/* ===== 会员标识 ===== */
.badge {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 5px;
  font-size: 11px;
  font-weight: 600;
}

.badge-member {
  background: rgba(236, 72, 153, 0.13);
  color: var(--pink);
}

.badge-paid {
  background: rgba(240, 140, 46, 0.16);
  color: var(--orange);
}

.badge-free {
  background: rgba(46, 163, 109, 0.14);
  color: var(--green);
}

/* ===== 会员套餐 ===== */
.plans {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.plan {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 34px;
  text-align: center;
  transition: all 0.28s;
  position: relative;
  backdrop-filter: blur(10px);
}

.plan:hover,
.plan.featured {
  border-color: var(--indigo);
  box-shadow: var(--glow);
  transform: translateY(-4px);
}

.plan.featured::after {
  content: "最受欢迎";
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-primary);
  color: #fff;
  padding: 3px 15px;
  border-radius: 20px;
  font-size: 12px;
}

.plan-name {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
}

.plan-price {
  font-size: 40px;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.plan-price span {
  font-size: 16px;
}

.plan-desc {
  color: var(--text-muted);
  font-size: 13px;
  margin: 16px 0 24px;
}

/* ===== 文章详情页 ===== */
.article-detail {
  max-width: 800px;
  margin: 0 auto;
  padding: 48px 24px;
}

.article-detail h1 {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 20px;
  line-height: 1.3;
}

.article-detail .meta {
  display: flex;
  gap: 16px;
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.article-content {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-primary);
}

.article-content h2 {
  font-size: 24px;
  margin: 32px 0 16px;
}

.article-content h3 {
  font-size: 20px;
  margin: 24px 0 12px;
}

.article-content p {
  margin-bottom: 16px;
}

.article-content pre {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
  overflow-x: auto;
  margin: 16px 0;
}

.article-content code {
  font-family: "Fira Code", monospace;
  font-size: 14px;
}

.article-content blockquote {
  border-left: 3px solid var(--indigo);
  padding-left: 16px;
  color: var(--text-secondary);
  margin: 16px 0;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
}

.article-content th,
.article-content td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
}

.article-content th {
  background: var(--bg-secondary);
}

.article-content ul,
.article-content ol {
  margin: 16px 0;
  padding-left: 24px;
}

/* ===== 锁定提示 ===== */
.locked-overlay {
  text-align: center;
  padding: 60px 20px;
  background: var(--bg-card);
  border: 1px dashed rgba(236, 72, 153, 0.4);
  border-radius: var(--radius);
}

.locked-overlay .lock-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.locked-overlay h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.locked-overlay p {
  color: var(--text-muted);
  margin-bottom: 24px;
}

/* ===== 表单 ===== */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  color: var(--text-secondary);
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  transition: all 0.2s;
}

.form-input:focus {
  outline: none;
  border-color: var(--indigo);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.14);
}

/* ===== 弹窗 ===== */
.modal-mask {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(5px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 34px;
  width: 90%;
  max-width: 420px;
  box-shadow: var(--shadow-lg);
}

.modal h2 {
  font-size: 22px;
  margin-bottom: 24px;
}

/* ===== 提示 ===== */
.toast {
  position: fixed;
  top: 80px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-secondary);
  border: 1px solid var(--indigo);
  color: var(--text-primary);
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  z-index: 300;
  box-shadow: var(--glow);
  font-size: 14px;
  animation: fadeIn 0.3s;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

/* ===== 页脚 ===== */
.footer {
  margin-top: 80px;
  padding: 40px 0;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
}

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .value-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .grid-3,
  .grid-2,
  .plans {
    grid-template-columns: 1fr;
  }

  .value-grid {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 32px;
  }

  .stats {
    gap: 28px;
    flex-wrap: wrap;
  }

  .nav-links {
    display: none;
  }
}

/* ===== Hero 左右分栏 ===== */
.hero-split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
  text-align: left;
  padding: 72px 0 60px;
}

.hero-split .hero-cta {
  justify-content: flex-start;
}

.hero-trust {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.hero-trust-item {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

/* Hero 产品预览卡 */
.hero-right {
  position: relative;
}

.hero-preview {
  position: relative;
  perspective: 1200px;
}

.preview-window {
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid var(--border-strong);
  border-radius: 20px;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(14px);
  overflow: hidden;
  transform: rotateY(-8deg) rotateX(3deg);
  transition: transform 0.4s;
}

.hero-preview:hover .preview-window {
  transform: rotateY(0deg) rotateX(0deg);
}

.preview-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: rgba(99, 102, 241, 0.05);
}

.preview-bar span:not(.preview-title) {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.preview-bar span:nth-child(1) { background: #f87171; }
.preview-bar span:nth-child(2) { background: #fbbf24; }
.preview-bar span:nth-child(3) { background: #34d399; }

.preview-title {
  margin-left: auto;
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
}

.preview-list {
  padding: 10px 16px 16px;
}

.preview-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 12px;
  border-radius: 12px;
  transition: background 0.2s;
}

.preview-item:hover {
  background: rgba(99, 102, 241, 0.06);
}

.preview-ico {
  width: 42px;
  height: 42px;
  border-radius: 11px;
  background: var(--gradient-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.preview-body {
  flex: 1;
  min-width: 0;
}

.preview-t {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.preview-d {
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.preview-tag {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 12px;
  background: var(--gradient-primary);
  color: #fff;
  flex-shrink: 0;
}

.float-badge {
  position: absolute;
  padding: 9px 16px;
  border-radius: 12px;
  font-size: 13px;
  font-weight: 700;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
  animation: float 5s ease-in-out infinite;
  z-index: 2;
}

.fb-1 { top: -18px; left: -20px; color: var(--indigo); }
.fb-2 { bottom: 24px; right: -16px; color: var(--pink); animation-delay: -1.5s; }
.fb-3 { top: 40%; right: -24px; color: var(--teal); animation-delay: -3s; }

/* ===== 统计条卡片化 ===== */
.stats-card {
  gap: 0;
  padding: 8px 12px;
  max-width: 920px;
}

.stats-card .stat-item {
  flex: 1;
  padding: 22px 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  position: relative;
}

.stats-card .stat-item + .stat-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24%;
  height: 52%;
  width: 1px;
  background: var(--border);
}

.stat-ico {
  font-size: 22px;
  margin-bottom: 2px;
}

/* ===== 精选头条卡 ===== */
.featured-hero {
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 34px;
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.08) 0%, rgba(99, 102, 241, 0.10) 50%, rgba(139, 92, 246, 0.08) 100%);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.28s;
  position: relative;
  overflow: hidden;
}

.featured-hero:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.featured-hero-body {
  flex: 1;
  min-width: 0;
}

.featured-hero-tags {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.featured-flag {
  font-size: 12px;
  font-weight: 700;
  color: var(--orange);
  background: rgba(240, 140, 46, 0.14);
  padding: 3px 12px;
  border-radius: 12px;
}

.featured-hero-title {
  font-size: 24px;
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.featured-hero-summary {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 16px;
}

.featured-hero-ico {
  width: 120px;
  height: 120px;
  flex-shrink: 0;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 52px;
  box-shadow: var(--shadow);
}

/* ===== 分类卡片网格 ===== */
.category-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
}

.category-card {
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px 16px;
  text-align: center;
  cursor: pointer;
  transition: all 0.26s;
  position: relative;
  overflow: hidden;
}

.category-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--cc, #6366f1);
  opacity: 0;
  transition: opacity 0.26s;
}

.category-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow);
}

.category-card:hover::before {
  opacity: 1;
}

.category-card-ico {
  width: 50px;
  height: 50px;
  margin: 0 auto 12px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--cc, #6366f1);
}

.category-card-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
}

.category-card-arrow {
  font-size: 16px;
  color: var(--cc, #6366f1);
  opacity: 0;
  transform: translateX(-6px);
  transition: all 0.26s;
  margin-top: 6px;
}

.category-card:hover .category-card-arrow {
  opacity: 1;
  transform: translateX(0);
}

.category-card-count {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
  font-weight: 500;
}

.category-card-all {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.09) 0%, rgba(139, 92, 246, 0.11) 100%);
  border-color: var(--border-strong);
}

/* 资源引导卡 */
.resource-teaser {
  background: linear-gradient(135deg, rgba(46, 163, 109, 0.07) 0%, rgba(14, 165, 233, 0.07) 100%);
  border-color: var(--border-strong);
}

.teaser-ico {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--gradient-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 16px;
}

/* ===== 最新更新时间线 ===== */
.timeline {
  position: relative;
  padding-left: 20px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--indigo) 0%, var(--violet) 100%);
  opacity: 0.25;
}

.timeline-item {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding: 16px 18px;
  border-radius: 13px;
  cursor: pointer;
  transition: background 0.2s;
  position: relative;
}

.timeline-item:hover {
  background: rgba(99, 102, 241, 0.06);
}

.timeline-dot {
  position: absolute;
  left: -20px;
  top: 24px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--indigo);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.12);
}

.timeline-date {
  font-size: 13px;
  color: var(--text-muted);
  white-space: nowrap;
  min-width: 76px;
  padding-top: 2px;
  font-weight: 500;
}

.timeline-content {
  flex: 1;
  min-width: 0;
}

.timeline-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.5;
}

.timeline-title:hover {
  color: var(--indigo);
}

.timeline-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 4px;
  font-size: 12px;
  color: var(--text-muted);
}

.timeline-cat {
  color: var(--indigo);
  font-weight: 600;
}

/* ===== 新版式响应式 ===== */
@media (max-width: 900px) {
  .hero-split {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-right {
    order: -1;
    max-width: 440px;
    margin: 0 auto;
  }

  .category-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .featured-hero {
    flex-direction: column;
    text-align: left;
    align-items: flex-start;
  }

  .featured-hero-ico {
    width: 72px;
    height: 72px;
    font-size: 34px;
  }
}

@media (max-width: 768px) {
  .stats-card .stat-item + .stat-item::before {
    display: none;
  }

  .stats-card {
    flex-wrap: wrap;
  }

  .stats-card .stat-item {
    flex: 1 1 40%;
  }

  .category-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-trust {
    gap: 12px;
  }

  .float-badge {
    display: none;
  }
}