/* ==========================================================================
   节点哨所 (NodePost.net) - 纯原生 CSS3 全局样式表
   风格：暗黑赛博 / 数据仪表盘 (Cyber Dark & Dashboard Aesthetic)
   ========================================================================== */

:root {
  --bg-primary: #080b11;
  --bg-secondary: #0f1420;
  --bg-card: #141b2d;
  --bg-card-hover: #1b243b;
  --bg-input: #0a0e17;

  --accent-cyan: #00f0ff;
  --accent-blue: #2563eb;
  --accent-purple: #7c3aed;
  --accent-green: #10b981;
  --accent-danger: #ef4444;
  --accent-warning: #f59e0b;

  --text-main: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --border-dim: rgba(255, 255, 255, 0.08);
  --border-bright: rgba(0, 240, 255, 0.3);
  --border-danger: rgba(239, 68, 68, 0.4);
  --glow-cyan: 0 0 15px rgba(0, 240, 255, 0.25);
  --glow-danger: 0 0 20px rgba(239, 68, 68, 0.3);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  --font-mono: "Fira Code", "Consolas", "Courier New", monospace;

  --container-max: 1280px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --transition-fast: 0.2s ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg-primary);
  color: var(--text-main);
}

body {
  font-family: var(--font-sans);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(0, 240, 255, 0.03) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(239, 68, 68, 0.03) 0%, transparent 40%);
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: #66f5ff;
  text-shadow: 0 0 8px rgba(0, 240, 255, 0.5);
}

ul, ol { list-style: none; }
img { max-width: 100%; height: auto; display: block; }

/* --------------------------------------------------------------------------
   2. 布局骨架 (Layout Structure)
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.main-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 2rem;
  margin: 2rem auto;
}

/* --------------------------------------------------------------------------
   3. Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  background-color: rgba(15, 20, 32, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-bright);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--glow-cyan);
  flex-shrink: 0;
}

.logo-icon svg {
  width: 22px;
  height: 22px;
  stroke: #080b11;
  fill: none;
}

.brand-name {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 1px;
  background: linear-gradient(to right, #fff, var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-slogan {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.main-nav ul {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-link {
  color: var(--text-main);
  font-weight: 600;
  font-size: 0.92rem;
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  white-space: nowrap !important;
}

.nav-link:hover {
  color: var(--accent-cyan);
  background-color: rgba(0, 240, 255, 0.08);
}

.nav-link.active {
  color: var(--accent-cyan);
  background: rgba(0, 240, 255, 0.12);
  border: 1px solid var(--border-bright);
  font-weight: 700;
}

/* --------------------------------------------------------------------------
   4. Hero Banner 头部区域 & 规范卡片
   -------------------------------------------------------------------------- */
.hero-section {
  padding: 2.5rem 0 1.75rem;
  border-bottom: 1px solid var(--border-dim);
  background: linear-gradient(180deg, rgba(0, 240, 255, 0.03) 0%, transparent 100%);
}

.hero-title {
  font-size: 2rem;
  font-weight: 900;
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.hero-title span {
  color: var(--accent-cyan);
  text-shadow: var(--glow-cyan);
}

.hero-subtitle {
  color: var(--text-secondary);
  font-size: 0.98rem;
  max-width: 960px;
  margin-bottom: 1.75rem;
  line-height: 1.7;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-fast);
}

.stat-card:hover {
  border-color: var(--border-bright);
  transform: translateY(-2px);
}

.stat-card.stat-danger {
  cursor: pointer;
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.08) 0%, var(--bg-card) 100%);
  border: 1px solid var(--border-danger);
  text-decoration: none !important;
}

.stat-card.stat-danger:hover {
  border-color: var(--accent-danger);
  box-shadow: var(--glow-danger);
  transform: translateY(-2px);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 800;
  font-family: var(--font-mono);
  margin: 0.2rem 0;
}

.stat-desc {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   5. 操作列实体带框双按钮 CSS 规范 (Boxed Buttons)
   -------------------------------------------------------------------------- */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  margin-bottom: 2rem;
}

.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.leaderboard-table th {
  background: #0d121d;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-dim);
  white-space: nowrap !important;
}

.leaderboard-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-dim);
  vertical-align: middle;
}

.leaderboard-table tbody tr:hover {
  background-color: var(--bg-card-hover);
}

.btn-tutorial {
  border: 1px solid var(--border-bright) !important;
  background: rgba(255, 255, 255, 0.05) !important;
  color: #fff !important;
  border-radius: 6px !important;
  padding: 0.35rem 0.7rem !important;
  font-size: 0.8rem !important;
  font-weight: 600 !important;
  white-space: nowrap !important;
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  gap: 0.3rem !important;
  transition: all var(--transition-fast) !important;
  text-decoration: none !important;
}

.btn-tutorial:hover {
  background: rgba(0, 240, 255, 0.15) !important;
  border-color: var(--accent-cyan) !important;
  color: var(--accent-cyan) !important;
  transform: translateY(-1px);
}

.btn-download {
  background: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%) !important;
  color: #fff !important;
  border: none !important;
  border-radius: 6px !important;
  padding: 0.35rem 0.7rem !important;
  font-size: 0.8rem !important;
  font-weight: 600 !important;
  white-space: nowrap !important;
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  gap: 0.3rem !important;
  box-shadow: 0 2px 8px rgba(6, 182, 212, 0.3) !important;
  transition: all var(--transition-fast) !important;
  text-decoration: none !important;
}

.btn-download:hover {
  filter: brightness(1.15) !important;
  transform: translateY(-1px) !important;
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.5) !important;
  color: #fff !important;
}

.brand-cell {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap !important;
}

.badge-rank {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 800;
  font-family: var(--font-mono);
  border-radius: 4px;
  white-space: nowrap !important;
}

.badge-rank-s {
  background: linear-gradient(135deg, #ffd700, #ff8c00);
  color: #000;
  box-shadow: 0 0 8px rgba(255, 215, 0, 0.4);
}

.badge-rank-a {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  color: #000;
}

.badge-rank-b {
  background: rgba(148, 163, 184, 0.2);
  color: var(--text-secondary);
  border: 1px solid var(--text-muted);
}

/* --------------------------------------------------------------------------
   6. 优惠活动网格 (Promotions Grid)
   -------------------------------------------------------------------------- */
.promo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.25rem;
}

/* --------------------------------------------------------------------------
   7. 表格下方 3 大深度内容矩阵 (架构对比表 + 防坑指南 + FAQ)
   -------------------------------------------------------------------------- */
.deep-section {
  margin-top: 3rem;
  margin-bottom: 3rem;
}

.section-h2 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.arch-compare-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-lg);
  overflow: hidden;
  font-size: 0.88rem;
  margin-bottom: 2.5rem;
}

.arch-compare-table th {
  background: #0c111c;
  padding: 0.9rem 1rem;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  border-bottom: 1px solid var(--border-dim);
  text-align: left;
}

.arch-compare-table td {
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--border-dim);
  line-height: 1.6;
  color: var(--text-secondary);
}

.arch-compare-table tr:hover {
  background: var(--bg-card-hover);
}

.anti-fraud-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.anti-fraud-card {
  background: var(--bg-card);
  border: 1px solid var(--border-dim);
  border-left: 4px solid var(--accent-cyan);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.anti-fraud-card h4 {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.5rem;
}

.anti-fraud-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   8. 4 文章卡片网格
   -------------------------------------------------------------------------- */
.articles-section {
  margin-bottom: 3rem;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  border-color: var(--border-bright);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.article-card.alert-card {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.08) 0%, var(--bg-card) 100%);
  border: 1px solid var(--border-danger);
}

.article-card.alert-card:hover {
  border-color: var(--accent-danger);
  box-shadow: var(--glow-danger);
}

.article-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0.6rem 0;
  line-height: 1.4;
}

.article-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1rem;
  flex-grow: 1;
}

.article-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
  padding-top: 0.5rem;
  border-top: 1px dashed rgba(255, 255, 255, 0.06);
}

/* --------------------------------------------------------------------------
   9. 侧边栏 5 大挂件
   -------------------------------------------------------------------------- */
.sponsored-banner-tall {
  background: linear-gradient(180deg, rgba(0, 240, 255, 0.08) 0%, var(--bg-card) 60%, rgba(15, 20, 32, 0.95) 100%);
  border: 1px solid var(--accent-cyan);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.18);
}

.sidebar-notice-box {
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.04) 0%, var(--bg-card) 100%);
  border: 1px solid var(--border-dim);
  border-left: 3.5px solid var(--accent-cyan);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.notice-title {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px dashed var(--border-dim);
}

.notice-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   10. 品牌测评卡片与组件
   -------------------------------------------------------------------------- */
.brand-summary-card {
  background: var(--bg-card);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin-bottom: 2rem;
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 1.75rem;
}

.pros-cons-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin: 2rem 0;
  background: var(--bg-card);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.pros-box {
  background: rgba(16, 185, 129, 0.05);
  border: 1px solid var(--accent-green);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.cons-box {
  background: rgba(239, 68, 68, 0.05);
  border: 1px solid var(--accent-danger);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.chart-caption-box {
  background: rgba(0, 240, 255, 0.04);
  border: 1px solid rgba(0, 240, 255, 0.15);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.1rem;
  margin-top: 0.85rem;
  margin-bottom: 1.75rem;
  font-size: 0.88rem;
  color: #cbd5e1;
}

.service-specs-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.75rem 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-md);
}

.service-specs-table td {
  padding: 0.85rem 1.1rem;
  border-bottom: 1px solid var(--border-dim);
  font-size: 0.92rem;
}

.test-standard-box {
  background: rgba(245, 158, 11, 0.06);
  border: 1px dashed var(--accent-warning);
  border-left: 4px solid var(--accent-warning);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin: 1.75rem 0;
  font-size: 0.88rem;
}

.faq-section {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px dashed var(--border-dim);
}

.faq-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.faq-question {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.faq-answer {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.toc-widget {
  background: var(--bg-card);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-top: 1rem;
}

.toc-widget h4 {
  font-size: 1rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px dashed var(--border-bright);
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.85rem;
}

.site-footer {
  background-color: #05070c;
  border-top: 1px solid var(--border-dim);
  padding: 3rem 0 1.5rem;
  margin-top: auto;
}

.footer-bottom {
  border-top: 1px solid var(--border-dim);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

@media (max-width: 992px) {
  .main-layout, .brand-summary-card, .pros-cons-box, .anti-fraud-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .header-inner { flex-direction: column; height: auto; padding: 1rem 0; gap: 0.75rem; }
  .main-nav ul { flex-wrap: wrap; justify-content: center; }
  .stats-grid { grid-template-columns: 1fr; }
}