/* ==============================================================================
   天行VPN (Tianxing VPN) - 核心视觉与交互设计系统
   风格基调：黑曜石极夜钛黑 (Obsidian Midnight Titanium)
   高光配色：电离矩阵翡翠绿 (Matrix Emerald) & 赛博量子青 (Cyber Quantum Cyan)
   ============================================================================== */

:root {
  /* 品牌核心色彩 */
  --bg-deep: #06090c;
  --bg-primary: #0a0e13;
  --bg-secondary: #0f151c;
  --bg-card: #131b23;
  --bg-card-hover: #18232e;
  --bg-glass: rgba(15, 21, 28, 0.75);
  
  /* 电离高光流光 */
  --accent-emerald: #00ff88;
  --accent-cyan: #00e5ff;
  --accent-blue: #0088ff;
  --accent-glow: rgba(0, 255, 136, 0.25);
  --accent-glow-cyan: rgba(0, 229, 255, 0.25);
  --gradient-neon: linear-gradient(135deg, #00ff88 0%, #00e5ff 100%);
  --gradient-card: linear-gradient(180deg, rgba(19, 27, 35, 0.9) 0%, rgba(10, 14, 19, 0.95) 100%);
  --gradient-border: linear-gradient(135deg, rgba(0, 255, 136, 0.3) 0%, rgba(0, 229, 255, 0.1) 50%, rgba(255, 255, 255, 0.05) 100%);

  /* 状态色 */
  --status-success: #00ff88;
  --status-warning: #ffa502;
  --status-danger: #ff4757;
  --status-info: #00e5ff;

  /* 文字颜色 */
  --text-main: #f0f6fc;
  --text-secondary: #9aa8b8;
  --text-muted: #5e6f82;
  --text-dim: #3a4756;

  /* 边框与阴影 */
  --border-color: rgba(0, 229, 255, 0.14);
  --border-light: rgba(255, 255, 255, 0.08);
  --border-emerald: rgba(0, 255, 136, 0.3);
  --shadow-neon: 0 0 25px rgba(0, 255, 136, 0.2), 0 0 50px rgba(0, 229, 255, 0.12);
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.7);

  /* 字体与字阶 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", Consolas, "Courier New", monospace;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  --container-max: 1240px;
}

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

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

body {
  background-color: var(--bg-deep);
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(0, 229, 255, 0.08) 0%, transparent 60%),
    radial-gradient(circle at 10% 30%, rgba(0, 255, 136, 0.05) 0%, transparent 40%),
    linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 48px 48px, 48px 48px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.25s ease;
}

img, svg {
  vertical-align: middle;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 极客排版与工具类 */
.mono {
  font-family: var(--font-mono);
}

.text-gradient {
  background: var(--gradient-neon);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.badge-emerald {
  background: rgba(0, 255, 136, 0.12);
  border: 1px solid var(--border-emerald);
  color: var(--accent-emerald);
}

.badge-cyan {
  background: rgba(0, 229, 255, 0.12);
  border: 1px solid rgba(0, 229, 255, 0.3);
  color: var(--accent-cyan);
}

.badge-danger {
  background: rgba(255, 71, 87, 0.15);
  border: 1px solid rgba(255, 71, 87, 0.4);
  color: var(--status-danger);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-emerald);
  box-shadow: 0 0 10px var(--accent-emerald);
  animation: pulseGlow 2s infinite;
}

@keyframes pulseGlow {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 255, 136, 0.7); }
  70% { transform: scale(1.1); box-shadow: 0 0 0 8px rgba(0, 255, 136, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 255, 136, 0); }
}

/* 顶部导航 Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(6, 9, 12, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #ffffff;
}

.brand-icon {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(0, 255, 136, 0.15), rgba(0, 229, 255, 0.15));
  border: 1px solid rgba(0, 255, 136, 0.4);
  box-shadow: 0 0 15px rgba(0, 255, 136, 0.2);
}

.brand-text-name {
  font-weight: 800;
  background: linear-gradient(90deg, #ffffff 40%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-item a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  padding: 6px 0;
  display: inline-block;
  transition: color 0.25s ease;
}

.nav-item a:hover {
  color: var(--text-main);
}

.nav-item a.active {
  color: var(--accent-emerald);
}

.nav-item a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0%;
  height: 2px;
  background: var(--gradient-neon);
  box-shadow: 0 0 10px var(--accent-emerald), 0 0 4px var(--accent-cyan);
  transition: width 0.25s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.2s ease;
  border-radius: 2px;
  opacity: 0;
}

.nav-item a.active::after {
  width: 100%;
  opacity: 1;
}

/* 锚点平滑滚动与吸顶导航避让偏移 */
section[id], div[id] {
  scroll-margin-top: 86px;
}

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

.mobile-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-light);
  color: var(--text-main);
  padding: 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  text-align: center;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--gradient-neon);
  color: #06090c;
  font-weight: 700;
  box-shadow: 0 0 20px rgba(0, 255, 136, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 255, 136, 0.6), 0 0 15px rgba(0, 229, 255, 0.4);
  color: #000;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-main);
}

.btn-secondary:hover {
  background: rgba(0, 229, 255, 0.1);
  border-color: var(--accent-cyan);
  color: #fff;
  transform: translateY(-2px);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 14px 32px;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

/* Hero Section */
.hero-section {
  padding: 80px 0 60px;
  position: relative;
  overflow: hidden;
}

.hero-glow-blob {
  position: absolute;
  top: -150px;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 500px;
  background: radial-gradient(circle, rgba(0, 255, 136, 0.15) 0%, rgba(0, 229, 255, 0.08) 50%, transparent 70%);
  pointer-events: none;
  filter: blur(80px);
  z-index: 0;
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1px;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

.hero-btn-group {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-top: 8px;
}

.hero-meta {
  display: flex;
  align-items: center;
  gap: 28px;
  padding-top: 16px;
  border-top: 1px solid var(--border-light);
  color: var(--text-muted);
  font-size: 0.88rem;
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.hero-meta-item strong {
  color: var(--text-main);
}

/* 终端模拟视窗 Hero Card */
.terminal-window {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card), 0 0 30px rgba(0, 229, 255, 0.1);
  overflow: hidden;
  position: relative;
}

.terminal-header {
  background: #090e13;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-light);
}

.terminal-dots {
  display: flex;
  gap: 8px;
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #2b333c;
}

.terminal-dot.red { background: #ff5f56; }
.terminal-dot.yellow { background: #ffbd2e; }
.terminal-dot.green { background: #27c93f; }

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

.terminal-body {
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: #c9d1d9;
  line-height: 1.6;
}

.terminal-line {
  margin-bottom: 8px;
  display: flex;
  gap: 10px;
}

.terminal-prefix {
  color: var(--accent-emerald);
}

.terminal-val {
  color: var(--accent-cyan);
}

.terminal-success {
  color: var(--status-success);
}

.terminal-danger {
  color: var(--status-danger);
}

/* 通用 Section 规范 */
.section {
  padding: 80px 0;
  position: relative;
}

.section-alt {
  background: linear-gradient(180deg, rgba(15, 21, 28, 0.5) 0%, rgba(6, 9, 12, 0.8) 100%);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 50px;
}

.section-header .badge {
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.6;
}

/* 核心特性卡片网格 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  position: relative;
  transition: all 0.3s ease;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: transparent;
  transition: all 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-emerald);
  box-shadow: 0 12px 35px -10px rgba(0, 255, 136, 0.15);
}

.feature-card:hover::before {
  background: var(--gradient-neon);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(0, 255, 136, 0.1);
  border: 1px solid rgba(0, 255, 136, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-emerald);
  margin-bottom: 22px;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* 交互看板 1：多协议动态跃频模拟器 */
.sim-container {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 36px;
  box-shadow: var(--shadow-neon);
}

.sim-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-light);
  flex-wrap: wrap;
  gap: 20px;
}

.sim-tabs {
  display: flex;
  gap: 12px;
  background: rgba(6, 9, 12, 0.7);
  padding: 4px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}

.sim-tab-btn {
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
}

.sim-tab-btn.active {
  background: var(--bg-card);
  color: var(--accent-emerald);
  box-shadow: 0 0 12px rgba(0, 255, 136, 0.2);
}

.sim-view-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin-top: 28px;
}

.sim-box {
  background: rgba(8, 12, 16, 0.85);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.sim-box-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.sim-canvas {
  width: 100%;
  height: 140px;
  background: #040608;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.05);
  display: block;
}

.sim-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 16px;
}

.sim-metric-item {
  background: rgba(255, 255, 255, 0.03);
  padding: 10px;
  border-radius: var(--radius-sm);
  text-align: center;
}

.sim-metric-label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.sim-metric-val {
  font-size: 1.05rem;
  font-weight: 700;
  font-family: var(--font-mono);
  margin-top: 4px;
}

/* 交互看板 2：全球 40+ 核心机房 Anycast 仪表盘 */
.dashboard-filter-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}

.filter-tags {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 6px 16px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.filter-btn.active, .filter-btn:hover {
  background: rgba(0, 229, 255, 0.12);
  border-color: var(--accent-cyan);
  color: #fff;
}

.nodes-table-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  box-shadow: var(--shadow-card);
}

.nodes-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

.nodes-table th {
  background: #0a0f15;
  padding: 14px 20px;
  color: var(--text-muted);
  font-weight: 600;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.nodes-table td {
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--text-secondary);
}

.nodes-table tr:hover td {
  background: rgba(0, 229, 255, 0.03);
}

.node-name-cell {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  color: var(--text-main);
}

.node-flag {
  font-size: 1.25rem;
}

.node-wave-canvas {
  width: 100px;
  height: 28px;
  vertical-align: middle;
}

/* 交互看板 3：生产力实测跑分看板 */
.benchmark-tabs {
  display: flex;
  justify-content: center;
  gap: 14px;
  margin-bottom: 32px;
}

.benchmark-tab-btn {
  padding: 12px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s;
  display: flex;
  align-items: center;
  gap: 8px;
}

.benchmark-tab-btn.active {
  background: rgba(0, 255, 136, 0.1);
  border-color: var(--accent-emerald);
  color: #fff;
  box-shadow: 0 0 20px rgba(0, 255, 136, 0.2);
}

.benchmark-panel {
  display: none;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 36px;
  box-shadow: var(--shadow-card);
}

.benchmark-panel.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.benchmark-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.bench-card {
  background: rgba(8, 12, 16, 0.9);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.bench-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.bench-score-large {
  font-size: 2.2rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--accent-emerald);
  margin-bottom: 8px;
}

.bench-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 价格卡片网格 Pricing */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 30px;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-color);
}

.pricing-card.featured {
  border-color: var(--accent-emerald);
  background: linear-gradient(180deg, rgba(19, 32, 28, 0.95) 0%, rgba(10, 14, 19, 0.98) 100%);
  box-shadow: 0 0 35px rgba(0, 255, 136, 0.25);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-8px);
}

.pricing-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-neon);
  color: #06090c;
  font-weight: 800;
  font-size: 0.75rem;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  box-shadow: 0 0 15px rgba(0, 255, 136, 0.4);
}

.pricing-header {
  margin-bottom: 20px;
}

.pricing-tier {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.pricing-desc {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.pricing-price-wrap {
  margin: 18px 0 24px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.pricing-currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent-emerald);
}

.pricing-amount {
  font-size: 3rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--text-main);
  line-height: 1;
}

.pricing-period {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.pricing-features {
  list-style: none;
  margin-bottom: 32px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.pricing-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.pricing-feature-item svg {
  color: var(--accent-emerald);
  flex-shrink: 0;
  margin-top: 3px;
}

.pricing-feature-item.muted {
  color: var(--text-dim);
}

.pricing-feature-item.muted svg {
  color: var(--text-dim);
}

/* FAQ 手风琴 */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.25s;
}

.faq-item.active {
  border-color: var(--border-color);
  background: var(--bg-card-hover);
}

.faq-question {
  padding: 22px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-weight: 700;
  font-size: 1.05rem;
}

.faq-icon {
  width: 24px;
  height: 24px;
  color: var(--accent-emerald);
  transition: transform 0.3s;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
  padding: 0 28px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 800px;
  padding-bottom: 24px;
  transition: max-height 0.35s ease-in-out;
}

/* 新闻与资讯公告中心（支持分页与展开） */
.news-filter-bar {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.news-card-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
  max-width: 960px;
  margin: 0 auto;
}

.news-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all 0.25s;
}

.news-card:hover {
  border-color: var(--border-color);
  box-shadow: 0 10px 25px -8px rgba(0, 229, 255, 0.12);
}

.news-card-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 12px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.news-title {
  font-size: 1.45rem;
  font-weight: 700;
  margin-bottom: 14px;
  line-height: 1.35;
}

.news-summary {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.7;
  margin-bottom: 18px;
}

.news-full-content {
  display: none;
  padding-top: 20px;
  margin-top: 18px;
  border-top: 1px dashed var(--border-light);
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
}

.news-card.expanded .news-full-content {
  display: block;
  animation: fadeIn 0.3s ease;
}

.news-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--accent-cyan);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.news-toggle-btn:hover {
  background: rgba(0, 229, 255, 0.1);
  color: #fff;
}

/* 分页器 Pagination */
.pagination-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 48px;
}

.page-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.page-btn:hover, .page-btn.active {
  background: rgba(0, 255, 136, 0.15);
  border-color: var(--accent-emerald);
  color: var(--accent-emerald);
}

.page-btn.disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

/* CTA 引导横幅 */
.cta-banner {
  background: linear-gradient(135deg, rgba(0, 255, 136, 0.12) 0%, rgba(0, 229, 255, 0.1) 100%), var(--bg-card);
  border: 1px solid var(--border-emerald);
  border-radius: var(--radius-xl);
  padding: 60px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 0 50px rgba(0, 255, 136, 0.15);
}

.cta-banner h2 {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-banner p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 680px;
  margin: 0 auto 32px;
}

/* 页脚 Footer */
.site-footer {
  background: #040608;
  border-top: 1px solid var(--border-light);
  padding: 64px 0 32px;
  margin-top: auto;
  color: var(--text-muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-top: 14px;
  max-width: 320px;
}

.footer-col-title {
  color: var(--text-main);
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 18px;
  letter-spacing: 0.5px;
}

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

.footer-links a {
  color: var(--text-muted);
  font-size: 0.88rem;
}

.footer-links a:hover {
  color: var(--accent-emerald);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

/* 响应式断点 */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.featured {
    transform: none;
  }
  .benchmark-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.2rem;
  }
  .section-title {
    font-size: 1.8rem;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .sim-view-grid {
    grid-template-columns: 1fr;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: #090e13;
    flex-direction: column;
    padding: 24px;
    gap: 18px;
    border-bottom: 1px solid var(--border-color);
  }
  .nav-links.mobile-open {
    display: flex;
  }
  .mobile-toggle {
    display: block;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}