/* ==============================================================================
   蚂蚁VPN (AntVPN) - 军工级零信任隐形网络与动态跳频抗 DPI 官方落地页样式系统
   主题：黑曜石哑光暗黑底色 + 电离极光青 / 矩阵冷翠绿高光渐变 (Titanium Obsidian & Aurora Cyan / Ion Emerald)
   规范：纯原生现代 CSS3，零外部依赖，毫秒级快速加载
   ============================================================================== */

:root {
  /* 基础黑曜石与钛晶暗黑基调 */
  --bg-obsidian-deep: #070a0d;
  --bg-obsidian-base: #0b1015;
  --bg-obsidian-surface: #10171e;
  --bg-obsidian-card: #151f28;
  --bg-obsidian-card-hover: #1c2935;
  --bg-obsidian-light: #233442;

  /* 电离极光青与矩阵冷翠绿高光色系 */
  --aurora-cyan: #00f5d4;
  --aurora-cyan-bright: #38ef7d;
  --aurora-cyan-glow: rgba(0, 245, 212, 0.25);
  --aurora-cyan-subtle: rgba(0, 245, 212, 0.08);

  --ion-emerald: #00ff87;
  --ion-emerald-dark: #10b981;
  --ion-emerald-glow: rgba(0, 255, 135, 0.2);
  --ion-emerald-subtle: rgba(0, 255, 135, 0.08);

  --gradient-stealth: linear-gradient(135deg, #00f5d4 0%, #00ff87 100%);
  --gradient-stealth-hover: linear-gradient(135deg, #38ef7d 0%, #00f5d4 100%);
  --gradient-dark-card: linear-gradient(180deg, rgba(21, 31, 40, 0.85) 0%, rgba(13, 19, 25, 0.95) 100%);
  --gradient-border-glow: linear-gradient(135deg, rgba(0, 245, 212, 0.3) 0%, rgba(0, 255, 135, 0.1) 100%);

  /* 边框与微光 */
  --border-subtle: rgba(255, 255, 255, 0.07);
  --border-medium: rgba(0, 245, 212, 0.2);
  --border-emerald: rgba(0, 255, 135, 0.3);
  --border-light: rgba(255, 255, 255, 0.12);

  /* 文字颜色 */
  --text-white: #f8fafc;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-dark: #475569;

  /* 状态与辅助色 */
  --accent-alert: #f43f5e;
  --accent-warning: #f59e0b;
  --accent-blue: #38bdf8;

  /* 字体家族 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "SFMono-Regular", Consolas, Menlo, monospace;

  /* 几何与阴影 */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --shadow-glow: 0 0 25px rgba(0, 245, 212, 0.2);
  --shadow-emerald: 0 0 30px rgba(0, 255, 135, 0.18);
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.7);
  --shadow-card-elevated: 0 20px 40px -15px rgba(0, 0, 0, 0.9), 0 0 20px rgba(0, 245, 212, 0.12);

  --transition-fast: 0.18s ease;
  --transition-normal: 0.28s ease;
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg-obsidian-deep);
  color: var(--text-primary);
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-obsidian-deep);
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(0, 245, 212, 0.08) 0%, transparent 60%),
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 100% 100%, 48px 48px, 48px 48px;
  background-position: center top, center top, center top;
  overflow-x: hidden;
}

/* 链接样式 */
a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

img, svg {
  vertical-align: middle;
}

/* 容器规范 */
.container {
  width: 100%;
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.container-narrow {
  max-width: 960px;
}

/* 栅格排版 */
.grid {
  display: grid;
  gap: 24px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* 徽章 Badge */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-family: var(--font-mono);
}

.badge-stealth {
  background: rgba(0, 245, 212, 0.12);
  color: var(--aurora-cyan);
  border: 1px solid rgba(0, 245, 212, 0.35);
}

.badge-emerald {
  background: rgba(0, 255, 135, 0.12);
  color: var(--ion-emerald);
  border: 1px solid rgba(0, 255, 135, 0.35);
}

.badge-outline {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

/* 呼吸红点/绿点指示器 */
.pulse-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--ion-emerald);
  position: relative;
  display: inline-block;
}

.pulse-indicator::after {
  content: "";
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  border-radius: 50%;
  background-color: inherit;
  opacity: 0.7;
  animation: pulse-ring 1.8s cubic-bezier(0.24, 0, 0.38, 1) infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.9); opacity: 0.8; }
  70% { transform: scale(2.2); opacity: 0; }
  100% { transform: scale(2.2); opacity: 0; }
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: 1px solid transparent;
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-stealth);
  color: var(--bg-obsidian-deep);
  box-shadow: 0 4px 18px rgba(0, 245, 212, 0.3);
}

.btn-primary:hover {
  background: var(--gradient-stealth-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 26px rgba(0, 255, 135, 0.45);
  color: var(--bg-obsidian-deep);
}

.btn-outline {
  background: rgba(16, 23, 30, 0.7);
  color: var(--text-white);
  border: 1px solid var(--border-medium);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  border-color: var(--aurora-cyan);
  background: rgba(0, 245, 212, 0.1);
  color: var(--aurora-cyan);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}

.btn-lg {
  padding: 16px 36px;
  font-size: 16px;
  border-radius: var(--radius-md);
}

.btn-block {
  width: 100%;
}

/* 渐变文本高亮 */
.text-gradient {
  background: var(--gradient-stealth);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.text-cyan {
  color: var(--aurora-cyan);
}

.text-emerald {
  color: var(--ion-emerald);
}

/* 卡片与容器组件 */
.card {
  background: var(--gradient-dark-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 28px;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

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

.card-glowing::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-stealth);
  opacity: 0.8;
}

/* ==============================================================================
   顶部导航栏 Header
   ============================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(11, 16, 21, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition-fast);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 800;
  color: var(--text-white);
  letter-spacing: -0.01em;
}

.logo-icon-wrap {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(0, 245, 212, 0.15) 0%, rgba(0, 255, 135, 0.1) 100%);
  border: 1px solid var(--border-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--aurora-cyan);
  box-shadow: 0 0 15px rgba(0, 245, 212, 0.2);
}

.logo-text {
  font-weight: 800;
  background: linear-gradient(135deg, #ffffff 40%, var(--aurora-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-white);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-stealth);
  border-radius: var(--radius-full);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.mobile-menu-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-white);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

@media (max-width: 900px) {
  .site-nav {
    display: none;
    position: absolute;
    top: 74px;
    left: 0;
    right: 0;
    background: var(--bg-obsidian-surface);
    border-bottom: 1px solid var(--border-subtle);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
  }
  .site-nav.open {
    display: flex;
  }
  .mobile-menu-btn {
    display: flex;
  }
  .header-actions .btn-sm {
    display: none;
  }
}

/* ==============================================================================
   页脚 Footer 规范（严禁出现 XML 网站地图）
   ============================================================================== */
.site-footer {
  margin-top: auto;
  background: var(--bg-obsidian-base);
  border-top: 1px solid var(--border-subtle);
  padding-top: 64px;
  padding-bottom: 36px;
  color: var(--text-secondary);
  font-size: 14px;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 56px;
}

@media (max-width: 992px) {
  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

@media (max-width: 600px) {
  .footer-top {
    grid-template-columns: 1fr;
  }
}

.footer-brand p {
  margin-top: 16px;
  line-height: 1.7;
  color: var(--text-muted);
  max-width: 360px;
}

.footer-col h4 {
  color: var(--text-white);
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: var(--font-mono);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 14px;
}

.footer-links a:hover {
  color: var(--aurora-cyan);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
}

.footer-compliance-badges {
  display: flex;
  gap: 16px;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
}

/* ==============================================================================
   极客交互组件 1：动态频谱跳频防嗅探监控仪 (Spectrum Frequency Hopping Monitor)
   ============================================================================== */
.spectrum-monitor-card {
  background: rgba(16, 23, 30, 0.95);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card-elevated);
  position: relative;
  overflow: hidden;
  font-family: var(--font-mono);
}

.monitor-header {
  background: rgba(21, 31, 40, 0.95);
  border-bottom: 1px solid var(--border-subtle);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

.monitor-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-white);
}

.terminal-dots {
  display: flex;
  gap: 6px;
}

.t-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.t-dot-red { background: #ef4444; }
.t-dot-yellow { background: #f59e0b; }
.t-dot-green { background: #10b981; }

.monitor-body {
  padding: 24px 20px;
}

.spectrum-bars-grid {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 96px;
  padding: 8px;
  background: rgba(7, 10, 13, 0.85);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  margin-bottom: 20px;
  position: relative;
  overflow: hidden;
}

.spectrum-bar {
  flex: 1;
  background: linear-gradient(180deg, var(--aurora-cyan) 0%, rgba(0, 255, 135, 0.3) 100%);
  border-radius: 2px 2px 0 0;
  min-height: 8px;
  transition: height 0.12s ease;
}

.spectrum-bar.active {
  background: linear-gradient(180deg, #ffffff 0%, var(--aurora-cyan) 60%, var(--ion-emerald) 100%);
  box-shadow: 0 0 10px var(--aurora-cyan);
}

.monitor-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

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

.metric-pill {
  background: rgba(21, 31, 40, 0.7);
  border: 1px solid var(--border-subtle);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
}

.metric-pill-label {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.metric-pill-val {
  font-size: 15px;
  font-weight: 700;
  color: var(--aurora-cyan);
}

/* ==============================================================================
   极客交互组件 2：端到端 ChaCha20-Poly1305 握手耗时仪表盘 (Latency Matrix)
   ============================================================================== */
.latency-matrix-card {
  background: var(--gradient-dark-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.node-item-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: rgba(16, 23, 30, 0.6);
  border: 1px solid var(--border-subtle);
  margin-bottom: 10px;
  font-family: var(--font-mono);
  transition: all var(--transition-fast);
}

.node-item-row:hover {
  background: rgba(28, 41, 53, 0.8);
  border-color: var(--border-medium);
  transform: translateX(4px);
}

.node-geo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-white);
}

.node-flag {
  font-size: 18px;
}

.node-stats {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 13px;
}

.node-ping {
  color: var(--ion-emerald);
  font-weight: 700;
}

.node-crypto {
  color: var(--text-muted);
  font-size: 11px;
}

/* ==============================================================================
   极客交互组件 3：TikTok / 独立站出海 / 外服电竞实测跑分看板
   ============================================================================== */
.benchmark-tabs {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 12px;
  overflow-x: auto;
}

.tab-btn {
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--text-white);
  border-color: var(--border-medium);
}

.tab-btn.active {
  background: rgba(0, 245, 212, 0.12);
  color: var(--aurora-cyan);
  border-color: var(--aurora-cyan);
  box-shadow: 0 0 16px rgba(0, 245, 212, 0.18);
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==============================================================================
   定价卡片组件 (Pricing Cards)
   ============================================================================== */
.pricing-card {
  background: var(--gradient-dark-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
}

.pricing-card.featured {
  border-color: var(--aurora-cyan);
  box-shadow: 0 0 35px rgba(0, 245, 212, 0.15), 0 20px 40px rgba(0, 0, 0, 0.8);
  transform: scale(1.03);
}

.pricing-ribbon {
  position: absolute;
  top: 16px;
  right: 16px;
  background: var(--gradient-stealth);
  color: var(--bg-obsidian-deep);
  font-size: 11px;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
}

.price-amount {
  font-size: 42px;
  font-weight: 800;
  color: var(--text-white);
  line-height: 1.1;
  margin: 16px 0;
}

.price-currency {
  font-size: 20px;
  color: var(--aurora-cyan);
  margin-right: 4px;
}

.price-cycle {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
}

.pricing-features {
  list-style: none;
  margin: 28px 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--text-secondary);
}

.pricing-features li.checked svg {
  color: var(--ion-emerald);
  flex-shrink: 0;
}

/* ==============================================================================
   手风琴 FAQ 引擎
   ============================================================================== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--gradient-dark-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--border-medium);
}

.faq-header {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
  font-weight: 700;
  font-size: 16px;
  color: var(--text-white);
}

.faq-icon {
  width: 20px;
  height: 20px;
  color: var(--aurora-cyan);
  transition: transform var(--transition-normal);
}

.faq-item.open .faq-icon {
  transform: rotate(180deg);
}

.faq-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.8;
}

.faq-item.open .faq-body {
  max-height: 800px;
  transition: max-height 0.4s ease-in-out;
  padding-bottom: 24px;
}

/* ==============================================================================
   资讯中心组件 (News Engine & Pagination)
   ============================================================================== */
.news-filter-bar {
  display: flex;
  gap: 10px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.news-filter-btn {
  background: rgba(16, 23, 30, 0.8);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 8px 18px;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.news-filter-btn:hover, .news-filter-btn.active {
  background: rgba(0, 245, 212, 0.15);
  color: var(--aurora-cyan);
  border-color: var(--aurora-cyan);
}

.news-card {
  background: var(--gradient-dark-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 28px;
  margin-bottom: 20px;
  transition: all var(--transition-fast);
}

.news-card:hover {
  border-color: var(--border-medium);
}

.news-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 12px;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.news-title {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-white);
  margin-bottom: 12px;
  line-height: 1.4;
}

.news-summary {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.7;
}

.news-full-content {
  display: none;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.8;
}

.news-full-content.show {
  display: block;
  animation: fadeIn 0.25s ease;
}

.news-toggle-btn {
  background: transparent;
  border: none;
  color: var(--aurora-cyan);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  margin-top: 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.pagination-controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin-top: 40px;
  font-family: var(--font-mono);
}

.page-num-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: rgba(16, 23, 30, 0.8);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-num-btn:hover, .page-num-btn.active {
  background: var(--aurora-cyan);
  color: var(--bg-obsidian-deep);
  border-color: var(--aurora-cyan);
}

.page-nav-btn {
  padding: 0 16px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: rgba(16, 23, 30, 0.8);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-weight: 700;
  cursor: pointer;
}

.page-nav-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

/* ==============================================================================
   go.html 与 404.html 极客终端全屏容器
   ============================================================================== */
.terminal-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.terminal-box {
  width: 100%;
  max-width: 680px;
  background: rgba(11, 16, 21, 0.95);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  box-shadow: 0 25px 60px -15px rgba(0, 0, 0, 0.9), var(--shadow-glow);
  overflow: hidden;
  font-family: var(--font-mono);
}

.terminal-bar {
  background: rgba(21, 31, 40, 0.9);
  padding: 12px 18px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.terminal-content {
  padding: 32px 24px;
  text-align: center;
}

.terminal-log-stream {
  background: rgba(7, 10, 13, 0.9);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 16px;
  text-align: left;
  font-size: 12px;
  color: var(--text-secondary);
  min-height: 130px;
  margin: 20px 0;
  line-height: 1.7;
}

.radar-sweep-box {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  border: 2px solid var(--border-medium);
  margin: 0 auto 20px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle, rgba(0, 245, 212, 0.1) 0%, transparent 70%);
}

.radar-spinner {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-radius: 50%;
  border-top: 2px solid var(--aurora-cyan);
  animation: spin 1.4s linear infinite;
}

@keyframes spin {
  100% { transform: rotate(360deg); }
}