/* ==========================================================================
   Psiphon (psiphon.my) - 官方极客工程与零信任网络设计系统
   视觉意象：黑曜石极夜钛黑底色 + 电离矩阵翡翠绿 / 赛博量子青高光渐变
   (Obsidian Midnight Titanium & Matrix Emerald / Cyber Quantum Cyan)
   ========================================================================== */

:root {
  /* 基础核心底色：黑曜石极夜钛黑 (Obsidian Midnight Titanium) */
  --bg-void: #05070a;
  --bg-primary: #090c12;
  --bg-secondary: #0e141f;
  --bg-surface: #121926;
  --bg-card: rgba(14, 20, 31, 0.75);
  --bg-card-hover: rgba(20, 28, 44, 0.88);
  --bg-glass: rgba(10, 14, 22, 0.88);
  --bg-terminal: #070a0f;

  /* 主题色 1：电离矩阵翡翠绿 (Matrix Emerald) */
  --emerald-matrix: #00f59b;
  --emerald-light: #46f8b5;
  --emerald-dark: #059669;
  --emerald-glow: rgba(0, 245, 155, 0.35);
  --emerald-subtle: rgba(0, 245, 155, 0.12);

  /* 主题色 2：赛博量子青 (Cyber Quantum Cyan) */
  --cyan-quantum: #00e5ff;
  --cyan-light: #5cf0ff;
  --cyan-dark: #0284c7;
  --cyan-glow: rgba(0, 229, 255, 0.35);
  --cyan-subtle: rgba(0, 229, 255, 0.12);

  /* 电离高能流复合渐变 */
  --gradient-ion: linear-gradient(135deg, #00f59b 0%, #00e5ff 100%);
  --gradient-ion-hover: linear-gradient(135deg, #46f8b5 0%, #5cf0ff 100%);
  --gradient-card: linear-gradient(180deg, rgba(20, 28, 44, 0.6) 0%, rgba(14, 20, 31, 0.8) 100%);
  --gradient-glass: linear-gradient(135deg, rgba(0, 245, 155, 0.05) 0%, rgba(0, 229, 255, 0.05) 100%);

  /* 辅助状态色 */
  --alert-red: #f43f5e;
  --alert-yellow: #f59e0b;
  --status-active: #00f59b;

  /* 文字颜色层级 */
  --text-main: #f8fafc;
  --text-sub: #cbd5e1;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  /* 边框体系 */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-light: rgba(255, 255, 255, 0.14);
  --border-matrix: rgba(0, 245, 155, 0.28);
  --border-cyan: rgba(0, 229, 255, 0.28);

  /* 字体家族 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "Cascadia Code", "Fira Code", Consolas, Monaco, monospace;

  /* 尺寸与间距 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --container-max: 1200px;
  --header-height: 72px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg-void);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

/* 极客拓扑网格底纹 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: 
    radial-gradient(circle at 50% 15%, rgba(0, 245, 155, 0.08) 0%, transparent 55%),
    radial-gradient(circle at 85% 75%, rgba(0, 229, 255, 0.06) 0%, transparent 50%),
    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%, 40px 40px, 40px 40px;
  z-index: -1;
  pointer-events: none;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  background: none;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* 头部导航栏 */
.site-header {
  position: sticky;
  top: 0;
  height: var(--header-height);
  background: rgba(9, 12, 18, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 1000;
  display: flex;
  align-items: center;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--gradient-ion);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #05070a;
  box-shadow: 0 0 16px var(--emerald-glow);
}

.brand-name {
  color: var(--text-main);
  font-weight: 800;
  font-size: 1.3rem;
  letter-spacing: -0.03em;
}

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

.nav-link {
  font-size: 0.9375rem;
  color: var(--text-sub);
  font-weight: 500;
  padding: 6px 0;
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--emerald-matrix);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--gradient-ion);
  border-radius: 2px;
  box-shadow: 0 0 8px var(--emerald-glow);
}

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

.mobile-toggle {
  display: none;
  color: var(--text-main);
  padding: 8px;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  white-space: nowrap;
}

.btn-sm {
  font-size: 0.875rem;
  padding: 8px 16px;
}

.btn-md {
  font-size: 0.95rem;
  padding: 10px 22px;
}

.btn-lg {
  font-size: 1.05rem;
  padding: 14px 30px;
  border-radius: var(--radius-lg);
}

.btn-primary {
  background: var(--gradient-ion);
  color: #05070a;
  font-weight: 700;
  box-shadow: 0 4px 20px var(--emerald-glow);
}

.btn-primary:hover {
  background: var(--gradient-ion-hover);
  box-shadow: 0 6px 26px var(--cyan-glow);
  transform: translateY(-1px);
}

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

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--cyan-quantum);
  color: var(--cyan-quantum);
}

.btn-outline-emerald {
  border: 1px solid var(--border-matrix);
  color: var(--emerald-matrix);
  background: var(--emerald-subtle);
}

.btn-outline-emerald:hover {
  background: var(--emerald-matrix);
  color: #05070a;
  box-shadow: 0 0 16px var(--emerald-glow);
}

/* 通用段落与标题渐变 */
.text-gradient {
  background: var(--gradient-ion);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.section {
  padding: 80px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  background: var(--emerald-subtle);
  border: 1px solid var(--border-matrix);
  color: var(--emerald-matrix);
  font-size: 0.8125rem;
  font-weight: 600;
  font-family: var(--font-mono);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.section-tag.cyan {
  background: var(--cyan-subtle);
  border-color: var(--border-cyan);
  color: var(--cyan-quantum);
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-sub);
  line-height: 1.7;
}

/* Hero 英雄区 */
.hero-section {
  padding: 80px 0 60px;
  position: relative;
}

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

.hero-pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.hero-title {
  font-size: 3.1rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.18;
  margin-bottom: 22px;
}

.hero-lead {
  font-size: 1.125rem;
  color: var(--text-sub);
  line-height: 1.75;
  margin-bottom: 32px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 36px;
}

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

.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.trust-item svg {
  color: var(--emerald-matrix);
}

/* Hero 右侧终端仪表板 */
.hero-dashboard-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-matrix);
  border-radius: var(--radius-xl);
  padding: 24px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5), 0 0 30px var(--emerald-glow);
  position: relative;
  overflow: hidden;
}

.hero-dashboard-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-ion);
}

.hud-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
}

.hud-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  font-family: var(--font-mono);
  color: var(--cyan-quantum);
  font-weight: 600;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--emerald-matrix);
  box-shadow: 0 0 10px var(--emerald-matrix);
  animation: pulseGlow 1.8s infinite;
}

@keyframes pulseGlow {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.hud-metric-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 18px;
}

.hud-stat-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 14px;
}

.hud-stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.hud-stat-val {
  font-size: 1.25rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--emerald-matrix);
}

/* 交互看板 1：多协议与 DPI 模拟看板 */
.dpi-simulator-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
}

.protocol-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.protocol-tab-btn {
  padding: 10px 18px;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  color: var(--text-sub);
  border: 1px solid var(--border-subtle);
  font-size: 0.875rem;
  font-family: var(--font-mono);
  font-weight: 600;
  transition: all 0.2s ease;
}

.protocol-tab-btn:hover {
  border-color: var(--cyan-quantum);
  color: var(--text-main);
}

.protocol-tab-btn.active {
  background: var(--emerald-subtle);
  border-color: var(--emerald-matrix);
  color: var(--emerald-matrix);
  box-shadow: 0 0 14px var(--emerald-glow);
}

.dpi-comparison-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.dpi-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: relative;
}

.dpi-card.highlight {
  border-color: var(--emerald-matrix);
  box-shadow: 0 0 24px var(--emerald-glow);
}

.dpi-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.dpi-badge {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
}

.dpi-badge.safe {
  background: var(--emerald-subtle);
  color: var(--emerald-matrix);
  border: 1px solid var(--border-matrix);
}

.dpi-badge.danger {
  background: rgba(244, 63, 94, 0.15);
  color: var(--alert-red);
  border: 1px solid rgba(244, 63, 94, 0.3);
}

.dpi-prop-list {
  list-style: none;
  font-size: 0.875rem;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.dpi-prop-item {
  display: flex;
  justify-content: space-between;
  padding-bottom: 8px;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.06);
}

.dpi-prop-label {
  color: var(--text-muted);
}

.dpi-prop-val {
  font-family: var(--font-mono);
  font-weight: 600;
}

/* 交互看板 2：全球 Anycast BGP 抖动与波形仪表盘 */
.bgp-dashboard-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-cyan);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4), 0 0 30px var(--cyan-glow);
}

.bgp-control-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}

.bgp-region-selector {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.bgp-node-btn {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-sub);
}

.bgp-node-btn.active {
  background: var(--cyan-subtle);
  border-color: var(--cyan-quantum);
  color: var(--cyan-quantum);
}

.oscilloscope-container {
  background: var(--bg-terminal);
  border: 1px solid rgba(0, 229, 255, 0.2);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 20px;
  position: relative;
}

.oscilloscope-canvas {
  width: 100%;
  height: 140px;
  display: block;
}

.bgp-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.bgp-stat-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px;
  text-align: center;
}

.bgp-stat-val {
  font-size: 1.4rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--cyan-quantum);
  margin-top: 4px;
}

/* 交互看板 3：实测跑分看板 */
.benchmark-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 32px;
}

.benchmark-tabs {
  display: flex;
  gap: 12px;
  margin-bottom: 28px;
}

.benchmark-tab-btn {
  flex: 1;
  text-align: center;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  font-weight: 600;
  color: var(--text-sub);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.benchmark-tab-btn.active {
  background: var(--gradient-glass);
  border-color: var(--emerald-matrix);
  color: var(--emerald-matrix);
  box-shadow: 0 0 16px var(--emerald-glow);
}

.benchmark-content-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.benchmark-metrics-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 24px;
}

.metric-bar-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.metric-bar-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.8125rem;
}

.metric-bar-track {
  width: 100%;
  height: 8px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 4px;
  overflow: hidden;
}

.metric-bar-fill {
  height: 100%;
  border-radius: 4px;
  background: var(--gradient-ion);
  transition: width 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 架构技术矩阵卡片 */
.matrix-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.matrix-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.matrix-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: transparent;
  transition: all 0.3s ease;
}

.matrix-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-matrix);
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.5), 0 0 20px var(--emerald-glow);
}

.matrix-card:hover::before {
  background: var(--gradient-ion);
}

.matrix-icon-box {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--emerald-subtle);
  border: 1px solid var(--border-matrix);
  color: var(--emerald-matrix);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.matrix-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.matrix-text {
  font-size: 0.9375rem;
  color: var(--text-sub);
  line-height: 1.7;
}

/* 定价卡片体系 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 36px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
}

.pricing-card:hover {
  border-color: var(--border-matrix);
  transform: translateY(-6px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
}

.pricing-card.featured {
  background: var(--gradient-card);
  border: 1px solid var(--emerald-matrix);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5), 0 0 30px var(--emerald-glow);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.05);
}

.featured-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-ion);
  color: #05070a;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  box-shadow: 0 4px 12px var(--emerald-glow);
}

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

.pricing-plan-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  min-height: 42px;
  margin-bottom: 20px;
}

.pricing-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.pricing-currency {
  font-size: 1.35rem;
  color: var(--text-sub);
  font-weight: 600;
}

.pricing-amount {
  font-size: 2.8rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--text-main);
}

.pricing-period {
  font-size: 0.875rem;
  color: var(--text-dim);
}

.pricing-feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 0.875rem;
  color: var(--text-sub);
  margin-bottom: 32px;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
}

.pricing-feature-item svg {
  color: var(--emerald-matrix);
  flex-shrink: 0;
}

/* FAQ 手风琴 */
.faq-grid {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

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

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

.faq-question {
  width: 100%;
  text-align: left;
  padding: 22px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
}

.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--emerald-matrix);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
  background: var(--emerald-matrix);
  color: #05070a;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1), padding 0.35s ease;
  padding: 0 24px;
  color: var(--text-sub);
  font-size: 0.95rem;
  line-height: 1.75;
}

.faq-item.active .faq-answer {
  padding: 0 24px 22px;
  max-height: 600px;
}

/* 技术公报与新闻中心卡片 */
.news-filter-bar {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}

.news-filter-btn {
  padding: 8px 20px;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-sub);
  font-size: 0.875rem;
  font-weight: 600;
  transition: all 0.2s ease;
}

.news-filter-btn:hover {
  border-color: var(--cyan-quantum);
  color: var(--text-main);
}

.news-filter-btn.active {
  background: var(--gradient-ion);
  color: #05070a;
  border-color: transparent;
  font-weight: 700;
}

.news-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}

.news-article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 28px 32px;
  transition: all 0.25s ease;
}

.news-article-card:hover {
  border-color: var(--border-matrix);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.news-meta-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 14px;
}

.news-tag {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  background: var(--emerald-subtle);
  color: var(--emerald-matrix);
  border: 1px solid var(--border-matrix);
  font-weight: 600;
}

.news-date {
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.news-title {
  font-size: 1.35rem;
  font-weight: 800;
  line-height: 1.4;
  margin-bottom: 12px;
  color: var(--text-main);
}

.news-summary {
  font-size: 0.95rem;
  color: var(--text-sub);
  line-height: 1.7;
  margin-bottom: 16px;
}

.news-full-content {
  display: none;
  font-size: 0.95rem;
  color: var(--text-sub);
  line-height: 1.8;
  padding-top: 16px;
  margin-top: 16px;
  border-top: 1px dashed var(--border-subtle);
}

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

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

.news-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--cyan-quantum);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 4px 0;
}

.news-toggle-btn:hover {
  color: var(--emerald-matrix);
}

/* 分页器控件 */
.pagination-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 48px;
}

.page-btn {
  min-width: 40px;
  height: 40px;
  padding: 0 12px;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-sub);
  font-family: var(--font-mono);
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.page-btn:hover:not(:disabled) {
  border-color: var(--emerald-matrix);
  color: var(--emerald-matrix);
}

.page-btn.active {
  background: var(--gradient-ion);
  color: #05070a;
  border-color: transparent;
}

.page-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* 使用文档与帮助中心 */
.help-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 40px;
  align-items: start;
}

.help-sidebar {
  position: sticky;
  top: 100px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.help-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.help-nav-link {
  display: block;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--text-sub);
  font-weight: 500;
}

.help-nav-link:hover,
.help-nav-link.active {
  background: var(--emerald-subtle);
  color: var(--emerald-matrix);
  font-weight: 600;
}

.help-content-area {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.help-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 36px;
}

.help-card-title {
  font-size: 1.45rem;
  font-weight: 800;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.terminal-box {
  background: var(--bg-terminal);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 18px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--emerald-light);
  overflow-x: auto;
  position: relative;
  margin: 16px 0;
}

/* 文本页面（关于我们、隐私政策、服务条款）通用规范 */
.legal-container {
  max-width: 880px;
  margin: 0 auto;
}

.legal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 48px;
  color: var(--text-sub);
  line-height: 1.85;
}

.legal-card h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
}

.legal-card h2:first-child {
  margin-top: 0;
}

.legal-card p {
  margin-bottom: 16px;
}

.legal-card ul {
  padding-left: 20px;
  margin-bottom: 18px;
}

.legal-card li {
  margin-bottom: 8px;
}

/* 页脚架构 (严格禁止 XML 网站地图 文本链接) */
.site-footer {
  background: #040508;
  border-top: 1px solid var(--border-subtle);
  padding: 72px 0 36px;
  margin-top: 80px;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand-info {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 360px;
}

.footer-col-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 0.875rem;
  color: var(--text-muted);
}

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

.footer-bottom {
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: var(--text-dim);
  flex-wrap: wrap;
  gap: 16px;
}

.footer-compliance-badges {
  display: flex;
  align-items: center;
  gap: 16px;
}

.compliance-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
}

.compliance-badge svg {
  color: var(--emerald-matrix);
}

/* 响应式断点适配 */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .matrix-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.25rem;
  }
  .section-title {
    font-size: 1.85rem;
  }
  .nav-menu {
    display: none;
  }
  .nav-menu.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(9, 12, 18, 0.98);
    border-bottom: 1px solid var(--border-matrix);
    padding: 24px;
    gap: 16px;
  }
  .mobile-toggle {
    display: block;
  }
  .dpi-comparison-grid,
  .bgp-stats-grid,
  .benchmark-metrics-row,
  .matrix-grid,
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .benchmark-tabs {
    flex-direction: column;
  }
  .help-layout {
    grid-template-columns: 1fr;
  }
  .legal-card {
    padding: 28px 20px;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}