/* ==========================================================================
   星辰VPN (XingChen VPN) - 轨道级全球加密加速网络
   Design Style: Deep Space Orbital Mechanics & Geometric Constellation
   Color Palette:
     - Cosmos Obsidian: #06080F
     - Midnight Indigo: #0F172A
     - Orbital Cyan: #38BDF8
     - Starlight Violet: #818CF8
   Pure Native CSS - 0 External Library - 100%秒开极致响应
   ========================================================================== */

:root {
  /* 基础配色 - 深色模式 (Deep Space Orbital Dark) */
  --bg-cosmos: #06080F;
  --bg-midnight: #0B1120;
  --bg-card: rgba(15, 23, 42, 0.72);
  --bg-card-hover: rgba(24, 34, 58, 0.88);
  --bg-hud: rgba(11, 17, 32, 0.78);
  --border-orbital: rgba(56, 189, 248, 0.18);
  --border-orbital-bright: rgba(56, 189, 248, 0.6);
  --border-subtle: rgba(148, 163, 184, 0.12);

  --text-main: #F8FAFC;
  --text-dim: #94A3B8;
  --text-muted: #64748B;

  /* 核心轨道主题色 */
  --orbital-cyan: #38BDF8;
  --orbital-cyan-glow: rgba(56, 189, 248, 0.35);
  --starlight-violet: #818CF8;
  --starlight-glow: rgba(129, 140, 248, 0.3);
  --orbit-gradient: linear-gradient(135deg, #38BDF8 0%, #818CF8 50%, #C084FC 100%);
  --orbit-gradient-hover: linear-gradient(135deg, #0EA5E9 0%, #6366F1 50%, #A855F7 100%);
  
  --chip-bg: rgba(56, 189, 248, 0.08);
  --chip-border: rgba(56, 189, 248, 0.25);
  --badge-bg: rgba(129, 140, 248, 0.14);
  --badge-text: #A5B4FC;

  --nav-bg: rgba(6, 8, 15, 0.82);
  --hud-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.7), 0 0 25px -5px rgba(56, 189, 248, 0.12);
  --card-shadow: 0 16px 36px -8px rgba(0, 0, 0, 0.5), 0 0 20px 0 rgba(56, 189, 248, 0.04);

  --theme-btn-bg: rgba(255, 255, 255, 0.06);
  --theme-btn-border: rgba(56, 189, 248, 0.25);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 白天浅色模式 (Starlight Celestial Light) */
[data-theme="light"] {
  --bg-cosmos: #F4F7FC;
  --bg-midnight: #FFFFFF;
  --bg-card: rgba(255, 255, 255, 0.88);
  --bg-card-hover: #FFFFFF;
  --bg-hud: rgba(255, 255, 255, 0.92);
  --border-orbital: rgba(14, 165, 233, 0.28);
  --border-orbital-bright: rgba(14, 165, 233, 0.8);
  --border-subtle: rgba(203, 213, 225, 0.7);

  --text-main: #0B132B;
  --text-dim: #334155;
  --text-muted: #64748B;

  --orbital-cyan: #0284C7;
  --orbital-cyan-glow: rgba(2, 132, 199, 0.25);
  --starlight-violet: #6366F1;
  --starlight-glow: rgba(99, 102, 241, 0.2);
  --orbit-gradient: linear-gradient(135deg, #0284C7 0%, #6366F1 50%, #9333EA 100%);
  --orbit-gradient-hover: linear-gradient(135deg, #0369A1 0%, #4F46E5 50%, #7E22CE 100%);

  --chip-bg: rgba(2, 132, 199, 0.07);
  --chip-border: rgba(2, 132, 199, 0.3);
  --badge-bg: rgba(99, 102, 241, 0.1);
  --badge-text: #4F46E5;

  --nav-bg: rgba(244, 247, 252, 0.88);
  --hud-shadow: 0 15px 35px -10px rgba(11, 19, 43, 0.08), 0 0 20px rgba(2, 132, 199, 0.08);
  --card-shadow: 0 12px 28px -6px rgba(15, 23, 42, 0.06);

  --theme-btn-bg: rgba(255, 255, 255, 0.8);
  --theme-btn-border: rgba(14, 165, 233, 0.3);
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-cosmos);
  color: var(--text-main);
  line-height: 1.65;
  transition: background-color 0.35s ease, color 0.35s ease;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* 交互 Canvas 背景容器 */
#orbit-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.85;
  transition: opacity 0.4s ease;
}

[data-theme="light"] #orbit-canvas {
  opacity: 0.35;
}

/* 通用容器 */
.container {
  width: 100%;
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* 顶部导航栏 Header */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition);
}

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

/* 品牌 Logo */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.5px;
}

.brand-logo-img {
  height: 40px;
  width: auto;
  display: block;
  object-fit: contain;
  transition: var(--transition);
}

.brand:hover .brand-logo-img {
  transform: scale(1.04);
  filter: drop-shadow(0 0 12px var(--orbital-cyan-glow));
}

.brand-logo-dark {
  display: block;
}

.brand-logo-light {
  display: none;
}

[data-theme="light"] .brand-logo-dark {
  display: none;
}

[data-theme="light"] .brand-logo-light {
  display: block;
}

/* 导航链接目录 */
.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-dim);
  font-size: 0.92rem;
  font-weight: 500;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--orbital-cyan);
}

/* “推荐资讯”专属亮点标签 */
.nav-badge-pulse {
  position: relative;
  color: var(--starlight-violet) !important;
  font-weight: 600 !important;
  background: var(--badge-bg);
  padding: 4px 12px !important;
  border-radius: var(--radius-full);
  border: 1px solid rgba(129, 140, 248, 0.3);
}

.nav-badge-pulse::after {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--starlight-violet);
  margin-left: 6px;
  vertical-align: 1px;
  box-shadow: 0 0 8px var(--starlight-violet);
  animation: pulseBeacon 2s infinite;
}

@keyframes pulseBeacon {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* 精致专业化透明昼夜模式切换按钮 */
.theme-toggle-btn {
  background: var(--theme-btn-bg);
  border: 1px solid var(--theme-btn-border);
  color: var(--text-main);
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  outline: none;
  position: relative;
}

.theme-toggle-btn:hover {
  border-color: var(--orbital-cyan);
  transform: scale(1.05);
  box-shadow: 0 0 15px var(--orbital-cyan-glow);
}

.theme-toggle-btn svg {
  width: 19px;
  height: 19px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
  transition: transform 0.4s ease;
}

/* 昼夜图标切换状态 */
.theme-toggle-btn .sun-icon {
  display: none;
}
.theme-toggle-btn .moon-icon {
  display: block;
}
[data-theme="light"] .theme-toggle-btn .sun-icon {
  display: block;
}
[data-theme="light"] .theme-toggle-btn .moon-icon {
  display: none;
}

/* 磁性与脉冲呼吁按钮 (CTA Button) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  white-space: nowrap;
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--orbit-gradient);
  color: #FFFFFF !important;
  box-shadow: 0 0 25px var(--orbital-cyan-glow);
}

.btn-primary:hover {
  background: var(--orbit-gradient-hover);
  transform: translateY(-2px);
  box-shadow: 0 0 35px rgba(56, 189, 248, 0.5);
}

.btn-outline {
  background: rgba(15, 23, 42, 0.4);
  color: var(--text-main);
  border-color: var(--border-orbital);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  background: var(--chip-bg);
  border-color: var(--orbital-cyan);
  color: var(--orbital-cyan);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.1rem;
  border-radius: var(--radius-full);
  min-height: 54px;
}

/* 主视觉区 Hero Section */
.hero {
  padding: 95px 0 70px;
  text-align: center;
  position: relative;
}

.hero-orbital-chip {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--chip-bg);
  border: 1px solid var(--chip-border);
  padding: 6px 18px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--orbital-cyan);
  margin-bottom: 26px;
  box-shadow: 0 0 20px var(--orbital-cyan-glow);
}

.hero-orbital-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--orbital-cyan);
  box-shadow: 0 0 10px var(--orbital-cyan);
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0% { transform: scale(0.9); opacity: 0.7; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.7; }
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -1.2px;
  margin-bottom: 24px;
  color: var(--text-main);
}

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

.hero-subtitle {
  font-size: 1.22rem;
  color: var(--text-dim);
  max-width: 820px;
  margin: 0 auto 38px;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 34px;
}

/* 浮动磨砂玻璃遥测状态栏 HUD (Live Telemetry Bar) */
.telemetry-hud {
  margin-top: 55px;
  background: var(--bg-hud);
  border: 1px solid var(--border-orbital);
  border-radius: var(--radius-lg);
  padding: 24px 32px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--hud-shadow);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: center;
}

.telemetry-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-align: left;
  border-right: 1px solid var(--border-subtle);
  padding-right: 16px;
}

.telemetry-item:last-child {
  border-right: none;
  padding-right: 0;
}

.telemetry-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.telemetry-pulse-led {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10B981;
  box-shadow: 0 0 10px #10B981;
  display: inline-block;
}

.telemetry-value {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-main);
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.telemetry-unit {
  font-size: 0.85rem;
  color: var(--orbital-cyan);
}

/* 协议微芯片交互组 (Protocol Chips) */
.protocol-chips-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.protocol-chip {
  padding: 4px 10px;
  background: var(--chip-bg);
  border: 1px solid var(--chip-border);
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--orbital-cyan);
  cursor: pointer;
  transition: var(--transition);
  font-family: ui-monospace, SFMono-Regular, monospace;
}

.protocol-chip.active,
.protocol-chip:hover {
  background: var(--orbital-cyan);
  color: #06080F;
  border-color: var(--orbital-cyan);
  box-shadow: 0 0 12px var(--orbital-cyan-glow);
}

/* 章节通用结构 */
.section {
  padding: 95px 0;
  position: relative;
}

.section-alt {
  background-color: rgba(11, 17, 32, 0.45);
}

[data-theme="light"] .section-alt {
  background-color: rgba(238, 242, 250, 0.6);
}

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

.section-tag {
  color: var(--orbital-cyan);
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.28;
  margin-bottom: 16px;
  letter-spacing: -0.6px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-dim);
}

/* 核心优势 Feature Bento Grid (3个暗色半透图文卡片) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.bento-card {
  background: var(--bg-card);
  border: 1px solid var(--border-orbital);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--card-shadow);
  transition: var(--transition);
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* 边框光波扫过动效 (Orbital Beam Effect) */
.bento-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--orbital-cyan), var(--starlight-violet), transparent);
  transform: translateX(-100%);
  transition: transform 0.6s ease;
}

.bento-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-orbital-bright);
  box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.6), 0 0 30px rgba(56, 189, 248, 0.15);
}

.bento-card:hover::before {
  transform: translateX(100%);
}

.bento-icon-box {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.12), rgba(129, 140, 248, 0.08));
  border: 1px solid var(--border-orbital);
  color: var(--orbital-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.bento-icon-box svg {
  width: 30px;
  height: 30px;
}

.bento-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.bento-text {
  font-size: 0.95rem;
  color: var(--text-dim);
  line-height: 1.7;
  margin-bottom: 20px;
}

.bento-routing-diagram {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px dashed var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.bento-diagram-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.bento-diagram-row svg {
  color: var(--orbital-cyan);
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* 流媒体图卡 & AI 支持图卡 */
.showcase-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.showcase-box {
  background: var(--bg-card);
  border: 1px solid var(--border-orbital);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  backdrop-filter: blur(16px);
  box-shadow: var(--card-shadow);
}

.showcase-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 22px;
}

.showcase-icon {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.15), rgba(129, 140, 248, 0.1));
  border: 1px solid var(--border-orbital);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--orbital-cyan);
}

.showcase-title {
  font-size: 1.35rem;
  font-weight: 700;
}

.showcase-desc {
  font-size: 0.95rem;
  color: var(--text-dim);
  line-height: 1.65;
  margin-bottom: 24px;
}

.matrix-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.matrix-card {
  background: rgba(11, 17, 32, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 8px;
  transition: var(--transition);
}

[data-theme="light"] .matrix-card {
  background: #F1F5F9;
}

.matrix-card:hover {
  border-color: var(--orbital-cyan);
  transform: translateY(-3px);
  box-shadow: 0 0 15px var(--orbital-cyan-glow);
}

.matrix-tag {
  font-size: 0.72rem;
  color: var(--orbital-cyan);
  background: var(--chip-bg);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 600;
}

.matrix-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-main);
}

/* 真实套餐价格对比表 (Pricing) */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-orbital);
  border-radius: var(--radius-lg);
  padding: 40px 30px;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
  position: relative;
  display: flex;
  flex-direction: column;
}

.pricing-card.popular {
  border-color: var(--orbital-cyan);
  transform: scale(1.03);
  box-shadow: 0 20px 45px -10px rgba(0, 0, 0, 0.7), 0 0 30px var(--orbital-cyan-glow);
}

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

.pricing-popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--orbit-gradient);
  color: #FFFFFF;
  padding: 5px 20px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.8px;
  box-shadow: 0 0 15px var(--orbital-cyan-glow);
  white-space: nowrap;
  z-index: 2;
}

.pricing-tier-name {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.pricing-tier-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  min-height: 42px;
  margin-bottom: 22px;
}

.pricing-amount-row {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 26px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-subtle);
}

.pricing-currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--orbital-cyan);
}

.pricing-digits {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-main);
  font-family: ui-monospace, SFMono-Regular, monospace;
}

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

.pricing-specs-list {
  list-style: none;
  margin-bottom: 32px;
  flex-grow: 1;
}

.pricing-specs-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-dim);
  margin-bottom: 14px;
}

.pricing-specs-list li svg {
  color: var(--orbital-cyan);
  width: 17px;
  height: 17px;
  flex-shrink: 0;
}

.pricing-specs-list li.disabled {
  color: var(--text-muted);
  opacity: 0.55;
  text-decoration: line-through;
}

/* 用户评价 (Testimonials) */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-orbital);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: var(--starlight-violet);
}

.review-rating-stars {
  color: #F59E0B;
  display: flex;
  gap: 3px;
  margin-bottom: 16px;
}

.review-text {
  font-size: 0.95rem;
  color: var(--text-dim);
  line-height: 1.7;
  margin-bottom: 22px;
  flex-grow: 1;
}

.review-user-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
}

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.2), rgba(129, 140, 248, 0.2));
  border: 1px solid var(--border-orbital);
  color: var(--orbital-cyan);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.review-user-info h4 {
  font-size: 0.95rem;
  font-weight: 700;
}

.review-user-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* 常见问题解答 FAQ */
.faq-box-wrap {
  max-width: 860px;
  margin: 0 auto;
}

.faq-entry {
  background: var(--bg-card);
  border: 1px solid var(--border-orbital);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-entry:hover {
  border-color: var(--orbital-cyan);
}

.faq-trigger {
  width: 100%;
  padding: 22px 26px;
  text-align: left;
  background: none;
  border: none;
  outline: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  transition: var(--transition);
}

.faq-trigger svg {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-entry.active .faq-trigger svg {
  transform: rotate(180deg);
  color: var(--orbital-cyan);
}

.faq-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.3s ease;
  padding: 0 26px;
  color: var(--text-dim);
  font-size: 0.95rem;
  line-height: 1.75;
}

.faq-entry.active .faq-body {
  max-height: 280px;
  padding: 0 26px 24px;
}

/* 底部 CTA 呼吁横幅 */
.cosmic-cta-banner {
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.95), rgba(6, 8, 15, 0.95));
  border: 1px solid var(--border-orbital-bright);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  color: #FFFFFF;
  margin-bottom: 50px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8), 0 0 35px var(--orbital-cyan-glow);
  position: relative;
  overflow: hidden;
}

.cosmic-cta-banner h2 {
  font-size: 2.3rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.cosmic-cta-banner p {
  font-size: 1.15rem;
  color: #94A3B8;
  max-width: 650px;
  margin: 0 auto 30px;
}

/* 页脚 Footer - 严格保留且仅保留四个标题链接，新标签页打开 */
.footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-cosmos);
  padding: 42px 0;
  text-align: center;
  margin-top: 50px;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}

.footer-nav a {
  text-decoration: none;
  color: var(--text-dim);
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
  position: relative;
}

.footer-nav a:hover {
  color: var(--orbital-cyan);
}

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

/* 独立内页排版通用 */
.doc-wrapper {
  padding: 60px 0 95px;
  max-width: 880px;
  margin: 0 auto;
}

.doc-header {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.doc-header h1 {
  font-size: 2.45rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.doc-header p {
  color: var(--text-dim);
  font-size: 1rem;
}

.doc-card {
  background: var(--bg-card);
  border: 1px solid var(--border-orbital);
  border-radius: var(--radius-lg);
  padding: 42px 36px;
  box-shadow: var(--card-shadow);
}

.doc-card h2 {
  font-size: 1.45rem;
  font-weight: 700;
  margin: 34px 0 14px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.doc-card h2:first-of-type {
  margin-top: 0;
}

.doc-card p {
  color: var(--text-dim);
  line-height: 1.85;
  margin-bottom: 16px;
}

.doc-card ul {
  margin: 0 0 22px 24px;
  color: var(--text-dim);
}

.doc-card ul li {
  margin-bottom: 10px;
  line-height: 1.75;
}

.orbital-notice-box {
  background: rgba(56, 189, 248, 0.08);
  border-left: 4px solid var(--orbital-cyan);
  padding: 16px 22px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  color: var(--text-main);
}

/* 网站地图网格 */
.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
  margin-top: 24px;
}

.sitemap-pane {
  background: rgba(11, 17, 32, 0.5);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
}

.sitemap-pane h3 {
  font-size: 1.15rem;
  margin-bottom: 14px;
  color: var(--orbital-cyan);
}

.sitemap-pane ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sitemap-pane ul li {
  margin-bottom: 12px;
}

.sitemap-pane ul li a {
  color: var(--text-main);
  text-decoration: none;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
}

.sitemap-pane ul li a:hover {
  color: var(--orbital-cyan);
  transform: translateX(4px);
}

/* 资讯专页卡片与结构 */
.article-meta {
  display: flex;
  gap: 18px;
  align-items: center;
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

/* 目录 (Table of Contents) 容器 */
.toc-box {
  background: rgba(11, 17, 32, 0.65);
  border: 1px solid var(--border-orbital);
  border-radius: var(--radius-md);
  padding: 22px 26px;
  margin: 28px 0 34px;
}

[data-theme="light"] .toc-box {
  background: #f1f5f9;
  border-color: rgba(14, 165, 233, 0.25);
}

.toc-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--orbital-cyan);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}

.toc-list {
  list-style: none;
  margin: 0 !important;
  padding: 0 !important;
}

.toc-list li {
  margin-bottom: 8px !important;
  line-height: 1.6 !important;
}

.toc-list li a {
  color: var(--text-main);
  text-decoration: none;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

.toc-list li a:hover {
  color: var(--orbital-cyan);
  transform: translateX(4px);
}

/* 相关阅读网格 (Related Reading) */
.related-box {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border-subtle);
}

.related-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.related-card {
  background: rgba(11, 17, 32, 0.55);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

[data-theme="light"] .related-card {
  background: #ffffff;
}

.related-card:hover {
  border-color: var(--orbital-cyan);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px -6px rgba(56, 189, 248, 0.2);
}

.related-card h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
  line-height: 1.45;
}

.related-card p {
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-bottom: 12px;
  flex-grow: 1;
}

.related-tag {
  font-size: 0.78rem;
  color: var(--orbital-cyan);
  font-weight: 600;
}

/* 推荐资讯列表网格 */
.hub-articles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 32px;
}

.hub-card {
  background: var(--bg-card);
  border: 1px solid var(--border-orbital);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.hub-card:hover {
  transform: translateY(-5px);
  border-color: var(--orbital-cyan);
  box-shadow: 0 16px 36px -8px rgba(0, 0, 0, 0.6), 0 0 25px rgba(56, 189, 248, 0.15);
}

.hub-card-tag {
  align-self: flex-start;
  background: var(--chip-bg);
  border: 1px solid var(--chip-border);
  color: var(--orbital-cyan);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 14px;
}

.hub-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 12px;
  color: var(--text-main);
}

.hub-card-title a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

.hub-card-title a:hover {
  color: var(--orbital-cyan);
}

.hub-card-desc {
  font-size: 0.92rem;
  color: var(--text-dim);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.hub-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.hub-card-link {
  color: var(--orbital-cyan);
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.hub-card-link:hover {
  text-decoration: underline;
}

/* 响应式断点 (@media) */
@media (max-width: 992px) {
  .hero-title {
    font-size: 2.7rem;
  }
  .telemetry-hud {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .features-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .pricing-card.popular {
    transform: none;
  }
  .showcase-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none; /* 移动端突出品牌、模式切换与注册转化 */
  }
  .hero {
    padding: 60px 0 45px;
  }
  .hero-title {
    font-size: 2.15rem;
    line-height: 1.25;
  }
  .hero-subtitle {
    font-size: 1.05rem;
  }
  .hero-cta {
    flex-direction: column;
    width: 100%;
  }
  .hero-cta .btn {
    width: 100%;
    min-height: 52px;
  }
  .telemetry-hud {
    grid-template-columns: 1fr;
    padding: 20px;
  }
  .telemetry-item {
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
    padding-bottom: 14px;
  }
  .telemetry-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }
  .matrix-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .sitemap-grid {
    grid-template-columns: 1fr;
  }
  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }
}