/* ===================================================================
   飞兔云 (feituyun.buzz) - 敏捷动能竞技视觉体系 (Kinetic Athletic Agility UI)
   设计准则：
   - 概念：生物力学弹簧张力 + 高速之字形敏捷奔跑跑道 (Slalom Velocity Track)
   - 纯炭黑底色 (#0C0E12) + 高能赛道荧光黄 (#E5FF00) + 运动白 (#FFFFFF)
   - 严禁低幼元素：无 AI 闪烁星星、无魔杖、无星星、无卡通头像
   - 纯原生 CSS3 | 毫秒级性能 | 全端单栏自适应 | 昼夜平滑过渡
   =================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  /* 基础竞技色彩系统（默认白天高能竞技模式） */
  --bg-page: #f1f4f8;
  --bg-carbon: #ffffff;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-subtle: #e8ecf2;
  --bg-track: rgba(12, 14, 18, 0.05);

  --text-main: #0c0e12;
  --text-body: #252b36;
  --text-muted: #5e687a;
  --text-dim: #8b95a5;

  /* 核心动能色彩 */
  --neon-yellow: #d8ee00;
  --neon-yellow-glow: rgba(216, 238, 0, 0.45);
  --neon-yellow-bg: rgba(216, 238, 0, 0.15);
  --accent-telemetry: #15803d;
  --racing-cyan: #00d2ff;
  --racing-emerald: #00e575;
  --racing-redline: #ff334b;

  --border-track: rgba(12, 14, 18, 0.12);
  --border-active: #0c0e12;
  --border-glow: rgba(216, 238, 0, 0.6);

  --shadow-hud: 0 4px 20px -2px rgba(12, 14, 18, 0.08);
  --shadow-kinetic: 0 12px 32px -4px rgba(12, 14, 18, 0.12);

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --radius-slalom: 24px;

  --transition-snap: 0.18s cubic-bezier(0.2, 0, 0, 1);
  --transition-spring: 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* 沉浸碳纤纯黑模式 (Pure Carbon Black #0C0E12) */
[data-theme="dark"] {
  --bg-page: #0c0e12;
  --bg-carbon: #12161f;
  --bg-surface: #151a24;
  --bg-surface-elevated: #1b212f;
  --bg-subtle: #1c2230;
  --bg-track: rgba(229, 255, 0, 0.04);

  --text-main: #ffffff;
  --text-body: #d1d7e3;
  --text-muted: #8b95a8;
  --text-dim: #556075;

  --neon-yellow: #e5ff00;
  --neon-yellow-glow: rgba(229, 255, 0, 0.5);
  --neon-yellow-bg: rgba(229, 255, 0, 0.12);
  --accent-telemetry: #e5ff00;
  --racing-cyan: #00e5ff;
  --racing-emerald: #00ff85;
  --racing-redline: #ff2a44;

  --border-track: rgba(255, 255, 255, 0.1);
  --border-active: #e5ff00;
  --border-glow: rgba(229, 255, 0, 0.45);

  --shadow-hud: 0 4px 24px -2px rgba(0, 0, 0, 0.7);
  --shadow-kinetic: 0 14px 40px -6px rgba(0, 0, 0, 0.85);
}

/* ===================================================================
   全局重置与竞技跑道底纹
   =================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  scroll-behavior: smooth;
  scroll-padding-top: 86px;
  background-color: var(--bg-page);
  color: var(--text-body);
  transition: background-color 0.3s ease, color 0.3s ease;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
  background-image: 
    linear-gradient(var(--border-track) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-track) 1px, transparent 1px);
  background-size: 60px 60px;
  background-position: center top;
}

/* 背景弹簧张力波形与斜向加速度线条 */
body::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1200px;
  background: 
    radial-gradient(ellipse at 50% 0%, var(--neon-yellow-bg) 0%, transparent 65%),
    repeating-linear-gradient(135deg, transparent, transparent 40px, var(--border-track) 40px, var(--border-track) 41px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.75;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-snap), transform var(--transition-snap);
}

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ===================================================================
   页眉导航 (Sticky + 全板块平滑跳转 + 推荐资讯 + 精工昼夜开关)
   =================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
  background: rgba(241, 244, 248, 0.94);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-track);
  transition: all 0.3s ease;
}

[data-theme="dark"] .site-header {
  background: rgba(12, 14, 18, 0.88);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--text-main);
  letter-spacing: -0.03em;
  text-transform: uppercase;
}

.logo-badge {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: var(--neon-yellow);
  color: #0c0e12;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 16px var(--neon-yellow-glow);
  transform: skewX(-10deg);
}

.brand-highlight {
  color: #1d4ed8;
}

[data-theme="dark"] .brand-highlight {
  color: var(--neon-yellow);
}

/* 导航链接：包含首页加各个板块及推荐资讯 */
.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
}

.nav-item a {
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text-muted);
  position: relative;
  padding: 8px 4px;
  display: inline-block;
  transition: color var(--transition-snap), transform var(--transition-snap);
}

.nav-item a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--neon-yellow);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-spring);
}

.nav-item a:hover,
.nav-item a.active {
  color: var(--neon-yellow);
  transform: translateY(-1px);
}

.nav-item a:hover::after,
.nav-item a.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

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

/* 昼夜模式切换按钮（精工透明化毛玻璃感） */
.theme-toggle-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  border: 1px solid var(--border-track);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-main);
  position: relative;
  cursor: pointer;
  transform: skewX(-6deg);
  transition: all var(--transition-snap);
}

.theme-toggle-btn:hover {
  border-color: var(--neon-yellow);
  color: var(--neon-yellow);
  box-shadow: 0 0 14px var(--neon-yellow-glow);
}

.theme-icon-sun,
.theme-icon-moon {
  position: absolute;
  transition: transform 0.35s cubic-bezier(0.2, 0, 0, 1), opacity 0.25s ease;
}

[data-theme="light"] .theme-icon-sun { opacity: 0; transform: rotate(90deg) scale(0.6); }
[data-theme="light"] .theme-icon-moon { opacity: 1; transform: rotate(0deg) scale(1); }
[data-theme="dark"] .theme-icon-sun { opacity: 1; transform: rotate(0deg) scale(1); }
[data-theme="dark"] .theme-icon-moon { opacity: 0; transform: rotate(-90deg) scale(0.6); }

/* 竞技级高能 CTA 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-weight: 800;
  font-size: 0.94rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  position: relative;
  transform: skewX(-8deg);
  transition: all var(--transition-snap);
}

.btn span, .btn svg {
  transform: skewX(8deg);
}

.btn-primary {
  background: var(--neon-yellow);
  color: #0c0e12;
  border: 1px solid var(--neon-yellow);
  box-shadow: 0 0 20px var(--neon-yellow-glow);
}

.btn-primary:hover {
  background: #ffffff;
  color: #0c0e12;
  border-color: #ffffff;
  box-shadow: 0 0 28px rgba(255, 255, 255, 0.6);
  transform: skewX(-8deg) translateY(-2px);
}

.btn-secondary {
  background: transparent;
  color: var(--text-main);
  border: 1px solid var(--border-track);
}

.btn-secondary:hover {
  border-color: var(--neon-yellow);
  color: var(--neon-yellow);
  box-shadow: 0 0 16px var(--neon-yellow-glow);
  transform: skewX(-8deg) translateY(-2px);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.05rem;
}

.btn-block {
  width: 100%;
}

/* ===================================================================
   主视觉区 (Hero Section) - 品牌名大标题 + 简介 + 弹弓测速 + TCP/UDP 切档
   =================================================================== */
.hero-section {
  padding: 70px 0 50px;
  position: relative;
  text-align: center;
}

.hero-telemetry-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 18px;
  background: var(--bg-surface);
  border: 1px solid var(--border-track);
  border-left: 3px solid var(--neon-yellow);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-main);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 22px;
  transform: skewX(-10deg);
}

[data-theme="dark"] .hero-telemetry-badge {
  color: var(--neon-yellow);
}

.hero-telemetry-badge span {
  transform: skewX(10deg);
}

.pulse-indicator {
  width: 8px;
  height: 8px;
  background: var(--racing-emerald);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--racing-emerald);
  animation: pulseNeon 1.5s infinite;
}

@keyframes pulseNeon {
  0% { transform: scale(0.9); opacity: 0.7; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.7; }
}

.hero-title {
  font-size: clamp(2.3rem, 5.5vw, 4.4rem);
  font-weight: 950;
  line-height: 1.1;
  color: var(--text-main);
  letter-spacing: -0.04em;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.hero-title .brand-accent {
  background: linear-gradient(135deg, #0c0e12 0%, #2563eb 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

[data-theme="dark"] .hero-title .brand-accent {
  background: linear-gradient(135deg, var(--neon-yellow) 0%, #ffffff 80%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 30px var(--neon-yellow-glow);
}

.hero-intro {
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  color: var(--text-body);
  max-width: 820px;
  margin: 0 auto 34px;
  line-height: 1.75;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

/* ===================================================================
   高能竞技 HUD 仪表盘与弹簧弹弓测速发射器 (Slingshot Speed-Test)
   =================================================================== */
.kinetic-hud-card {
  max-width: 1060px;
  margin: 0 auto;
  background: var(--bg-surface);
  border: 1px solid var(--border-track);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-kinetic);
  padding: 28px;
  position: relative;
  overflow: hidden;
}

.hud-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-track);
  padding-bottom: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 14px;
}

.hud-brand-spec {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 12px;
}

/* TCP / UDP 物理切档滑块 (Frictionless Protocol Switch) */
.protocol-toggle-group {
  display: flex;
  align-items: center;
  background: var(--bg-subtle);
  border: 1px solid var(--border-track);
  border-radius: var(--radius-sm);
  padding: 4px;
  gap: 4px;
}

.protocol-btn {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 800;
  padding: 6px 14px;
  border-radius: 3px;
  color: var(--text-muted);
  background: transparent;
  cursor: pointer;
  transition: all var(--transition-snap);
}

.protocol-btn.active {
  background: var(--neon-yellow);
  color: #0c0e12;
  box-shadow: 0 0 12px var(--neon-yellow-glow);
}

/* 弹簧张力弹弓测速交互条 (Slingshot Speed-Test Bar) */
.slingshot-container {
  background: var(--bg-subtle);
  border: 1px solid var(--border-track);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 24px;
  text-align: left;
}

.slingshot-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
  flex-wrap: wrap;
  gap: 8px;
}

.slingshot-title {
  font-size: 0.92rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.tension-readout {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--accent-telemetry);
}

.slingshot-track-bar {
  position: relative;
  height: 22px;
  background: var(--bg-page);
  border: 1px solid var(--border-track);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  padding: 0 6px;
  cursor: pointer;
  user-select: none;
}

.slingshot-elastic-band {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 25%;
  background: linear-gradient(90deg, var(--border-track), var(--neon-yellow));
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  transition: width 0.1s ease;
  pointer-events: none;
}

.slingshot-handle {
  position: absolute;
  left: calc(25% - 16px);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: var(--neon-yellow);
  border: 2px solid #ffffff;
  color: #0c0e12;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: grab;
  box-shadow: 0 0 16px var(--neon-yellow-glow);
  transform: skewX(-8deg);
  transition: left 0.1s ease, transform var(--transition-snap);
}

.slingshot-handle:active {
  cursor: grabbing;
  transform: skewX(-8deg) scale(1.1);
}

.slingshot-action-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 14px;
}

.slingshot-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.launch-btn {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 900;
  background: var(--neon-yellow);
  color: #0c0e12;
  padding: 6px 18px;
  border-radius: 3px;
  cursor: pointer;
  border: none;
  transform: skewX(-8deg);
  transition: all var(--transition-snap);
}

.launch-btn:hover {
  background: #ffffff;
  box-shadow: 0 0 16px rgba(255, 255, 255, 0.7);
}

/* 遥测多服务器跨栏节点 (Telemetry Hurdle Nodes) */
.hud-nodes-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  text-align: left;
}

.hurdle-node-card {
  background: var(--bg-subtle);
  border: 1px solid var(--border-track);
  border-radius: var(--radius-sm);
  padding: 16px;
  position: relative;
  transition: all var(--transition-spring);
}

.hurdle-node-card:hover {
  border-color: var(--neon-yellow);
  transform: translateY(-4px) scale(1.02);
  box-shadow: 0 6px 20px var(--neon-yellow-glow);
}

.hurdle-location {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.hurdle-name {
  font-size: 0.84rem;
  font-weight: 800;
  color: var(--text-main);
  text-transform: uppercase;
}

.hurdle-type-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--neon-yellow);
  border: 1px solid var(--border-track);
  padding: 1px 6px;
  border-radius: 2px;
}

.hurdle-latency-val {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--racing-emerald);
  letter-spacing: -0.04em;
  margin-bottom: 4px;
}

.hurdle-spec-line {
  font-size: 0.72rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
}

/* ===================================================================
   之字形奔跑跑道 (Diagonal Zigzag Slalom Track) 视觉脊椎
   =================================================================== */
.slalom-track-section {
  position: relative;
  padding: 80px 0;
}

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

.section-lap-counter {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-main);
  background: var(--bg-surface);
  border: 1px solid var(--border-track);
  border-left: 3px solid var(--neon-yellow);
  padding: 3px 14px;
  margin-bottom: 12px;
  letter-spacing: 0.1em;
  transform: skewX(-10deg);
}

[data-theme="dark"] .section-lap-counter {
  color: var(--neon-yellow);
}

.section-lap-counter span {
  transform: skewX(10deg);
}

.section-main-title {
  font-size: clamp(1.9rem, 3.8vw, 2.7rem);
  font-weight: 950;
  color: var(--text-main);
  text-transform: uppercase;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

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

/* ===================================================================
   产品核心优势 (3个图文卡片) - 敏捷跨栏造型
   =================================================================== */
.features-agility-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.agility-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-track);
  border-radius: var(--radius-md);
  padding: 34px 28px;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-spring);
  overflow: hidden;
}

.agility-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 0;
  background: var(--neon-yellow);
  transition: height 0.3s ease;
}

.agility-card:hover {
  transform: translateY(-8px) skewX(-2deg);
  border-color: var(--neon-yellow);
  box-shadow: 0 12px 32px var(--neon-yellow-glow);
}

.agility-card:hover::before {
  height: 100%;
}

.agility-icon-box {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  border: 1px solid var(--border-track);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--neon-yellow);
  margin-bottom: 24px;
  transform: skewX(-8deg);
  transition: all var(--transition-snap);
}

.agility-card:hover .agility-icon-box {
  background: var(--neon-yellow);
  color: #0c0e12;
  box-shadow: 0 0 18px var(--neon-yellow-glow);
}

.agility-card-title {
  font-size: 1.35rem;
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 12px;
}

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

.agility-card-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-top: 1px solid var(--border-track);
  padding-top: 16px;
}

.agility-card-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-body);
}

.agility-card-list li svg {
  color: var(--neon-yellow);
  flex-shrink: 0;
}

/* ===================================================================
   流媒体图卡 & AI 支持图卡 (Dual High-Speed Showcase)
   =================================================================== */
.showcase-track-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.showcase-telemetry-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-track);
  border-radius: var(--radius-md);
  padding: 36px 32px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-spring);
}

.showcase-telemetry-box:hover {
  border-color: var(--neon-yellow);
  transform: translateY(-6px);
  box-shadow: 0 12px 30px var(--neon-yellow-glow);
}

.showcase-tag-line {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--neon-yellow);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.showcase-h3 {
  font-size: 1.65rem;
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 12px;
}

.showcase-p {
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 24px;
}

.stream-chips-track {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 24px;
}

.stream-chip-unit {
  background: var(--bg-subtle);
  border: 1px solid var(--border-track);
  padding: 10px 12px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--text-body);
  transition: transform var(--transition-snap);
}

.stream-chip-unit:hover {
  transform: translateY(-2px);
  border-color: var(--neon-yellow);
}

.ai-chips-track {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.ai-chip-unit {
  background: var(--bg-subtle);
  border: 1px solid var(--border-track);
  padding: 12px 14px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: transform var(--transition-snap);
}

.ai-chip-unit:hover {
  transform: translateY(-2px);
  border-color: var(--neon-yellow);
}

.ai-chip-unit h4 {
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--text-main);
}

.ai-chip-unit p {
  font-size: 0.74rem;
  color: var(--text-muted);
}

.telemetry-bottom-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-track);
  padding-top: 16px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.status-emerald {
  color: var(--racing-emerald);
  font-weight: 800;
}

/* ===================================================================
   参考网上真实套餐价格表 (Pricing Comparison Matrix)
   =================================================================== */
.pricing-matrix-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-bracket-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-track);
  border-radius: var(--radius-md);
  padding: 38px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-spring);
}

.pricing-bracket-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-glow);
  box-shadow: 0 16px 36px var(--neon-yellow-glow);
}

/* 爆款热销版 (年度旗舰) 核心视觉高亮 */
.pricing-bracket-card.featured {
  border: 2px solid var(--neon-yellow);
  background: var(--bg-surface-elevated);
  box-shadow: 0 0 30px var(--neon-yellow-glow);
  transform: scale(1.03);
}

.pricing-bracket-card.featured:hover {
  transform: scale(1.05) translateY(-6px);
}

.bracket-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%) skewX(-8deg);
  background: var(--neon-yellow);
  color: #0c0e12;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 900;
  padding: 4px 18px;
  border-radius: 3px;
  box-shadow: 0 0 14px var(--neon-yellow-glow);
  white-space: nowrap;
}

.bracket-ribbon span {
  transform: skewX(8deg);
}

.bracket-header {
  text-align: center;
  border-bottom: 1px solid var(--border-track);
  padding-bottom: 24px;
  margin-bottom: 24px;
}

.bracket-name {
  font-size: 1.45rem;
  font-weight: 900;
  color: var(--text-main);
  text-transform: uppercase;
  margin-bottom: 6px;
}

.bracket-summary {
  font-size: 0.88rem;
  color: var(--text-muted);
  min-height: 42px;
}

.bracket-price-box {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  margin: 18px 0 6px;
}

.bracket-sym {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-main);
}

.bracket-figure {
  font-family: var(--font-mono);
  font-size: 2.8rem;
  font-weight: 950;
  color: var(--text-main);
  letter-spacing: -0.04em;
  line-height: 1;
}

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

.bracket-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 800;
  color: var(--neon-yellow);
  background: var(--neon-yellow-bg);
  border: 1px solid var(--border-track);
  padding: 2px 10px;
  border-radius: 2px;
  margin-top: 6px;
}

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

.bracket-specs-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-body);
}

.bracket-specs-list li strong {
  color: var(--text-main);
}

.bracket-specs-list li svg {
  color: var(--neon-yellow);
  flex-shrink: 0;
}

.bracket-footer {
  margin-top: auto;
}

/* ===================================================================
   用户真实评价 (Testimonials)
   =================================================================== */
.reviews-matrix-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.review-telemetry-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-track);
  border-radius: var(--radius-md);
  padding: 26px 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-snap);
}

.review-telemetry-card:hover {
  border-color: var(--neon-yellow);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--neon-yellow-glow);
}

.review-score-stars {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--neon-yellow);
  font-weight: 800;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.review-body-text {
  font-size: 0.92rem;
  color: var(--text-body);
  line-height: 1.65;
  margin-bottom: 18px;
  flex-grow: 1;
}

.reviewer-profile-row {
  display: flex;
  align-items: center;
  gap: 10px;
  border-top: 1px solid var(--border-track);
  padding-top: 14px;
}

.reviewer-initial-badge {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  border: 1px solid var(--border-track);
  color: var(--neon-yellow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 0.88rem;
  transform: skewX(-8deg);
}

.reviewer-creds h4 {
  font-size: 0.88rem;
  font-weight: 800;
  color: var(--text-main);
}

.reviewer-creds p {
  font-size: 0.74rem;
  color: var(--text-muted);
}

/* ===================================================================
   常见问题解答 (FAQ) - 手风琴
   =================================================================== */
.faq-accordion-box {
  max-width: 880px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-entry {
  background: var(--bg-surface);
  border: 1px solid var(--border-track);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color var(--transition-snap);
}

.faq-entry:hover {
  border-color: var(--neon-yellow);
}

.faq-trigger {
  width: 100%;
  text-align: left;
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: none;
  cursor: pointer;
  border: none;
}

.faq-chevron {
  color: var(--neon-yellow);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-entry.active .faq-chevron {
  transform: rotate(180deg);
}

.faq-detail {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.3s ease;
  color: var(--text-body);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-entry.active .faq-detail {
  max-height: 500px;
  padding: 0 24px 22px;
}

/* ===================================================================
   高能冲刺横幅 (Sprint CTA Banner)
   =================================================================== */
.sprint-banner {
  background: var(--bg-surface);
  border: 2px solid var(--neon-yellow);
  border-radius: var(--radius-md);
  padding: 56px 36px;
  text-align: center;
  margin: 40px auto 80px;
  box-shadow: 0 0 36px var(--neon-yellow-glow);
  position: relative;
  overflow: hidden;
}

.sprint-banner-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 950;
  color: var(--text-main);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.sprint-banner-sub {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 auto 28px;
}

/* ===================================================================
   规范页脚 (严格保留四个标题并在新窗口打开)
   =================================================================== */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-track);
  padding: 44px 0;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 36px;
  list-style: none;
}

.footer-nav li a {
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--text-body);
  letter-spacing: 0.02em;
  padding: 6px 2px;
  transition: color var(--transition-snap);
}

.footer-nav li a:hover {
  color: var(--neon-yellow);
}

.footer-copyright {
  font-size: 0.84rem;
  color: var(--text-muted);
  text-align: center;
}

/* ===================================================================
   子页面排版系统 (Prose Sections)
   =================================================================== */
.subpage-hero {
  padding: 60px 0 40px;
  text-align: center;
  border-bottom: 1px solid var(--border-track);
  background: var(--bg-surface);
}

.subpage-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 12px;
}

.subpage-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 auto;
}

.subpage-content {
  padding: 50px 0 90px;
  max-width: 900px;
  margin: 0 auto;
}

.prose-section {
  background: var(--bg-surface);
  border: 1px solid var(--border-track);
  border-radius: var(--radius-md);
  padding: 34px 36px;
  margin-bottom: 28px;
  box-shadow: var(--shadow-hud);
}

.prose-section h2 {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.prose-section p {
  font-size: 0.98rem;
  line-height: 1.75;
  color: var(--text-body);
  margin-bottom: 14px;
}

.prose-section ul {
  margin-left: 20px;
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.prose-section li {
  font-size: 0.95rem;
  color: var(--text-body);
}

.callout-box {
  background: var(--bg-subtle);
  border-left: 4px solid var(--neon-yellow);
  padding: 16px 20px;
  margin: 20px 0;
  font-size: 0.92rem;
  color: var(--text-body);
}

.callout-box.warning {
  border-left-color: var(--racing-redline);
  background: rgba(255, 51, 75, 0.08);
}

.callout-box.success {
  border-left-color: var(--racing-emerald);
  background: rgba(0, 229, 117, 0.08);
}

/* ===================================================================
   SEO 深度长文与资讯中心排版组件 (Article Typography & Components)
   =================================================================== */
.article-breadcrumbs {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.article-breadcrumbs a {
  color: var(--text-muted);
}

.article-breadcrumbs a:hover {
  color: var(--neon-yellow);
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-track);
  padding-bottom: 18px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.article-badge {
  background: var(--bg-subtle);
  border: 1px solid var(--border-track);
  border-left: 3px solid var(--neon-yellow);
  padding: 3px 10px;
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--text-main);
  text-transform: uppercase;
}

[data-theme="dark"] .article-badge {
  color: var(--neon-yellow);
}

/* 文章目录 (Table of Contents) */
.article-toc {
  background: var(--bg-subtle);
  border: 1px solid var(--border-track);
  border-radius: var(--radius-sm);
  padding: 22px 26px;
  margin: 26px 0 36px;
}

.article-toc-title {
  font-size: 1.05rem;
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.article-toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-left: 0 !important;
}

.article-toc-list li a {
  color: var(--text-body);
  font-size: 0.94rem;
  font-weight: 600;
  display: flex;
  align-items: baseline;
  gap: 8px;
  transition: color var(--transition-snap), transform var(--transition-snap);
}

.article-toc-list li a:hover {
  color: var(--neon-yellow);
  transform: translateX(4px);
}

.article-toc-list .toc-num {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.84rem;
  flex-shrink: 0;
}

/* 比较表格 (Comparison Table) */
.article-table-wrapper {
  overflow-x: auto;
  margin: 26px 0;
  border: 1px solid var(--border-track);
  border-radius: var(--radius-sm);
}

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

.article-table th {
  background: var(--bg-subtle);
  color: var(--text-main);
  font-weight: 800;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-track);
  white-space: nowrap;
}

.article-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-track);
  color: var(--text-body);
}

.article-table tr:last-child td {
  border-bottom: none;
}

.article-table tr:hover td {
  background: var(--bg-subtle);
}

/* 资讯中心文章矩阵卡片 (News Portal Cards) */
.news-cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
}

.news-portal-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-track);
  border-radius: var(--radius-md);
  padding: 30px 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-spring);
  position: relative;
  overflow: hidden;
}

.news-portal-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--neon-yellow);
  opacity: 0;
  transition: opacity 0.25s ease;
}

.news-portal-card:hover {
  transform: translateY(-6px);
  border-color: var(--neon-yellow);
  box-shadow: 0 12px 30px var(--neon-yellow-glow);
}

.news-portal-card:hover::before {
  opacity: 1;
}

.news-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.news-card-title {
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1.45;
  margin-bottom: 12px;
  transition: color var(--transition-snap);
}

.news-portal-card:hover .news-card-title {
  color: var(--neon-yellow);
}

.news-card-excerpt {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 22px;
  flex-grow: 1;
}

.news-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-track);
  padding-top: 14px;
  font-size: 0.86rem;
  font-weight: 700;
}

/* 相关阅读区域 (Related Reading) */
.related-reading-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-track);
  border-radius: var(--radius-md);
  padding: 30px;
  margin-top: 40px;
}

.related-reading-title {
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.related-links-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.related-link-item {
  background: var(--bg-subtle);
  border: 1px solid var(--border-track);
  padding: 16px 18px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: flex-start;
  gap: 10px;
  transition: all var(--transition-snap);
}

.related-link-item:hover {
  border-color: var(--neon-yellow);
  transform: translateX(4px);
}

.related-link-item h4 {
  font-size: 0.94rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 4px;
}

.related-link-item p {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin: 0;
}

/* ===================================================================
   响应式单栏适配 (@media 针对移动端极致调优)
   =================================================================== */
@media (max-width: 1080px) {
  .features-agility-grid,
  .pricing-matrix-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-bracket-card.featured {
    transform: none;
  }
  .reviews-matrix-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hud-nodes-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: 66px;
  }

  .nav-links {
    display: none; /* 移动端顶部极简，保留品牌、昼夜开关与直达 CTA */
  }

  .hero-section {
    padding: 44px 0 32px;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }

  .hero-cta-group .btn {
    width: 100%;
    min-height: 48px;
  }

  .features-agility-grid,
  .showcase-track-grid,
  .pricing-matrix-grid,
  .reviews-matrix-grid,
  .hud-nodes-grid,
  .news-cards-grid,
  .related-links-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .stream-chips-track {
    grid-template-columns: repeat(2, 1fr);
  }

  .ai-chips-track {
    grid-template-columns: 1fr;
  }

  .prose-section {
    padding: 24px 20px;
  }

  .footer-nav {
    gap: 18px 24px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .brand-logo {
    font-size: 1.15rem;
  }

  .stream-chips-track {
    grid-template-columns: 1fr;
  }

  .slingshot-track-bar {
    height: 26px;
  }
}