/* ====================================================================
   IKUUU (ikuuu.help) 核心样式表
   设计体系：DARK OBSIDIAN & CYBER AURORA (暗夜曜石与赛博极光高转化流光)
   视觉特性：流星粒子光效、雷达微光脉冲、流光扫过按钮、多彩霓虹芯片、模块化便当盒网格
   性能规范：纯原生 CSS3、零 WebFont (系统字体栈)、零外部 CDN、加载极速
   ==================================================================== */

:root {
  /* 基础暗黑画布体系 */
  --bg-page: #060913;
  --bg-surface: #0c1322;
  --bg-surface-elevated: #131c31;
  --bg-surface-glass: rgba(12, 19, 34, 0.88);
  --bg-subtle: #111a2e;
  
  /* 多元高饱和极光色彩体系 */
  --cyber-cyan: #00f0ff;
  --electric-blue: #38bdf8;
  --aurora-purple: #c084fc;
  --aurora-violet: #818cf8;
  --neon-pink: #f43f5e;
  --emerald-glow: #10b981;
  --mint-light: #34d399;
  --amber-gold: #fbbf24;
  --solar-orange: #fb923c;

  /* 品牌核心主色与辉光 */
  --primary: #00f0ff;
  --primary-hover: #38bdf8;
  --primary-glow: rgba(0, 240, 255, 0.35);
  --purple-glow: rgba(192, 132, 252, 0.35);
  --emerald-glow-rgb: rgba(16, 185, 129, 0.35);

  /* 动态发光边框体系 */
  --border-color: rgba(255, 255, 255, 0.08);
  --border-subtle: rgba(255, 255, 255, 0.12);
  --border-cyan: rgba(0, 240, 255, 0.35);
  --border-purple: rgba(192, 132, 252, 0.35);
  --border-emerald: rgba(16, 185, 129, 0.35);

  /* 文字颜色体系 (WCAG AAA 级高对比，黑白极度清晰) */
  --text-main: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-inverse: #020617;

  /* 布局与圆角规范 */
  --max-width: 1160px;
  --header-height: 70px;
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 9999px;

  /* 阴影规范 */
  --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.5);
  --shadow-card: 0 8px 30px -4px rgba(0, 0, 0, 0.6), 0 0 0 1px var(--border-color);
  --shadow-glow-cyan: 0 0 30px rgba(0, 240, 255, 0.22);
  --shadow-glow-purple: 0 0 30px rgba(192, 132, 252, 0.22);

  /* 系统字体栈 (绝无中文字体外链，保证极致 LCP) */
  --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

/* 全局重置与多重极光流光背景 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg-page);
}

body {
  font-family: var(--font-stack);
  background-color: var(--bg-page);
  /* 炫彩多层微光氛围 + 纯 CSS 动态感数码十字网格，0 请求高视觉丰富度 */
  background-image: 
    radial-gradient(circle at 10% 8%, rgba(0, 240, 255, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 90% 25%, rgba(192, 132, 252, 0.12) 0%, transparent 45%),
    radial-gradient(circle at 50% 65%, rgba(16, 185, 129, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 20% 90%, rgba(244, 63, 94, 0.08) 0%, transparent 45%),
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 100% 100%, 100% 100%, 40px 40px, 40px 40px;
  background-attachment: fixed;
  color: var(--text-main);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 76px;
  overflow-x: hidden;
}

@media (min-width: 768px) {
  body {
    padding-bottom: 0;
  }
}

:focus-visible {
  outline: 2px solid var(--cyber-cyan);
  outline-offset: 3px;
}

a {
  color: var(--cyber-cyan);
  text-decoration: none;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

a:hover {
  color: #7dd3fc;
  text-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
}

img, svg {
  max-width: 100%;
  height: auto;
  display: block;
}

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

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* ====================================================================
   动效关键帧动画定义 (Pure CSS Keyframes)
   ==================================================================== */
@keyframes radarPulse {
  0% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  }
  70% {
    transform: scale(1);
    box-shadow: 0 0 0 8px rgba(16, 185, 129, 0);
  }
  100% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
  }
}

@keyframes buttonShimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes floatGentle {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-5px); }
}

@keyframes borderRotate {
  0% { border-color: rgba(0, 240, 255, 0.35); }
  50% { border-color: rgba(192, 132, 252, 0.45); }
  100% { border-color: rgba(0, 240, 255, 0.35); }
}

@keyframes liveSignalBar {
  0%, 100% { height: 35%; }
  50% { height: 100%; }
}

@keyframes meteorAnimation {
  0% {
    transform: rotate(215deg) translateX(0);
    opacity: 0.8;
  }
  70% {
    opacity: 1;
  }
  100% {
    transform: rotate(215deg) translateX(-600px);
    opacity: 0;
  }
}

/* ====================================================================
   顶部导航 Header - 悬浮流光黑曜石
   ==================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-surface-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  height: var(--header-height);
  display: flex;
  align-items: center;
  transition: all 0.3s ease;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.site-logo:hover .logo-badge {
  transform: rotate(-6deg) scale(1.06);
  box-shadow: 0 0 22px rgba(0, 240, 255, 0.6);
}

.logo-badge {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #00f0ff 0%, #818cf8 100%);
  color: #020617;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.05rem;
  font-weight: 900;
  box-shadow: 0 0 16px rgba(0, 240, 255, 0.35);
  transition: all 0.25s ease;
}

.nav-menu {
  display: none;
  align-items: center;
  gap: 26px;
}

@media (min-width: 860px) {
  .nav-menu {
    display: flex;
  }
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 2px;
  transition: color 0.2s ease;
}

.nav-link:hover, .nav-link.active {
  color: var(--cyber-cyan);
  text-shadow: 0 0 8px rgba(0, 240, 255, 0.4);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--cyber-cyan), var(--aurora-purple));
  border-radius: var(--radius-pill);
}

.nav-actions {
  display: none;
  align-items: center;
}

@media (min-width: 860px) {
  .nav-actions {
    display: flex;
  }
}

.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
}

@media (min-width: 860px) {
  .menu-toggle {
    display: none;
  }
}

/* 移动端导航抽屉 */
.mobile-nav {
  position: absolute;
  top: var(--header-height);
  left: 0;
  right: 0;
  background-color: rgba(12, 19, 34, 0.96);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
  display: none;
}

.mobile-nav.is-open {
  display: block;
}

.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.mobile-nav-link {
  display: block;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 10px 14px;
  border-radius: var(--radius-xs);
  background: rgba(255, 255, 255, 0.03);
  transition: all 0.2s ease;
}

.mobile-nav-link:hover {
  background: rgba(0, 240, 255, 0.1);
  color: var(--cyber-cyan);
}

/* ====================================================================
   按钮系统 (Buttons)
   ==================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, #00f0ff 0%, #38bdf8 50%, #818cf8 100%);
  background-size: 200% 200%;
  color: #020617;
  font-weight: 800;
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.35);
  animation: buttonShimmer 5s ease infinite;
}

.btn-primary:hover {
  color: #020617;
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 240, 255, 0.6);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(8px);
}

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

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

.btn-block {
  width: 100%;
}

/* ====================================================================
   Hero 模块 (Hero Bento Grid & Shooting Meteors)
   ==================================================================== */
.hero-section {
  position: relative;
  padding: 56px 0 72px 0;
  border-bottom: 1px solid var(--border-color);
  overflow: hidden;
}

/* 纯 CSS 悬浮流星光效 (0 请求) */
.hero-meteors-wrap {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}

.meteor {
  position: absolute;
  top: 0;
  left: 50%;
  width: 2px;
  height: 2px;
  background: #fff;
  border-radius: 9999px;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.1), 0 0 0 2px rgba(255, 255, 255, 0.1), 0 0 8px rgba(0, 240, 255, 0.8);
  transform: rotate(215deg);
  opacity: 0;
  pointer-events: none;
  animation: meteorAnimation 4s linear infinite;
}

.meteor::before {
  content: "";
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 120px;
  height: 1px;
  background: linear-gradient(90deg, rgba(0, 240, 255, 0.8), transparent);
}

.meteor-1 { top: -20px; left: 85%; animation-delay: 0.2s; animation-duration: 3.5s; }
.meteor-2 { top: -40px; left: 65%; animation-delay: 1.4s; animation-duration: 4.2s; }
.meteor-3 { top: -10px; left: 45%; animation-delay: 2.1s; animation-duration: 3.8s; }
.meteor-4 { top: -30px; left: 25%; animation-delay: 0.8s; animation-duration: 4.5s; }
.meteor-5 { top: -50px; left: 95%; animation-delay: 2.8s; animation-duration: 3.2s; }
.meteor-6 { top: -20px; left: 15%; animation-delay: 1.9s; animation-duration: 4.0s; }

.hero-bento-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

@media (min-width: 960px) {
  .hero-bento-grid {
    grid-template-columns: 1.15fr 0.85fr;
  }
}

.hero-text-wrap {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.hero-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 16px;
  background: rgba(0, 240, 255, 0.08);
  color: var(--cyber-cyan);
  border: 1px solid var(--border-cyan);
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 700;
  width: fit-content;
  box-shadow: 0 0 16px rgba(0, 240, 255, 0.15);
}

.pulse-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--emerald-glow);
  animation: radarPulse 2s infinite;
}

.hero-title {
  font-size: 2.2rem;
  font-weight: 900;
  line-height: 1.25;
  color: var(--text-main);
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #ffffff 40%, #bae6fd 80%, #a855f7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

@media (min-width: 640px) {
  .hero-title {
    font-size: 2.9rem;
  }
}

.hero-subtitle {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text-secondary);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 6px;
}

.hero-tags-row {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 10px;
  padding-top: 18px;
  border-top: 1px solid var(--border-color);
}

.hero-tag-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
}

.hero-tag-item svg {
  width: 18px;
  height: 18px;
  color: var(--cyber-cyan);
}

/* Hero HUD 监控卡 */
.hero-hud-card {
  background: rgba(12, 19, 34, 0.85);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.6), 0 0 24px rgba(0, 240, 255, 0.12);
  backdrop-filter: blur(12px);
  position: relative;
  overflow: hidden;
  animation: floatGentle 6s ease-in-out infinite;
}

.hud-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 18px;
}

.hud-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--cyber-cyan);
}

.hud-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  background: rgba(16, 185, 129, 0.15);
  color: var(--mint-light);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 700;
}

.hud-metric-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 18px;
}

.hud-metric-box {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
}

.hud-metric-label {
  font-size: 0.76rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.hud-metric-val {
  font-size: 1.6rem;
  font-weight: 900;
  font-family: var(--font-mono);
  color: var(--text-main);
}

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

.hud-route-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xs);
  padding: 8px 12px;
  font-size: 0.84rem;
  transition: all 0.2s ease;
}

.hud-route-item:hover {
  background: rgba(0, 240, 255, 0.05);
  border-color: var(--border-cyan);
}

.hud-route-name {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
}

.hud-route-tag {
  font-family: var(--font-mono);
  color: var(--cyber-cyan);
  font-weight: 700;
}

.hud-route-ping {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--mint-light);
}

/* ====================================================================
   通篇通用 Section 布局
   ==================================================================== */
.section {
  padding: 68px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 48px auto;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--cyber-cyan);
  letter-spacing: 0.1em;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  text-shadow: 0 0 10px rgba(0, 240, 255, 0.4);
}

.section-title {
  font-size: 2rem;
  font-weight: 900;
  line-height: 1.3;
  color: var(--text-main);
  letter-spacing: -0.01em;
  margin-bottom: 12px;
}

@media (min-width: 640px) {
  .section-title {
    font-size: 2.35rem;
  }
}

.section-desc {
  font-size: 1.02rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* ====================================================================
   核心特性模块 (Features Bento Grid)
   ==================================================================== */
.features-bento-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

@media (min-width: 768px) {
  .features-bento-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.bento-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--shadow-card);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.bento-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(0, 240, 255, 0.5), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.bento-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-cyan);
  box-shadow: 0 14px 36px -6px rgba(0, 0, 0, 0.8), 0 0 24px rgba(0, 240, 255, 0.2);
}

.bento-card:hover::before {
  opacity: 1;
}

.bento-card-wide {
  grid-column: 1 / -1;
}

.bento-card-tag {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--cyber-cyan);
  margin-bottom: 12px;
}

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

.bento-card-desc {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.bento-bullet-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: auto;
}

.bento-bullet-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.bento-bullet-item svg {
  width: 17px;
  height: 17px;
  color: var(--cyber-cyan);
  flex-shrink: 0;
}

/* ====================================================================
   优势亮点解析 (Benefits Grid)
   ==================================================================== */
.benefits-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 640px) {
  .benefits-grid {
    grid-template-columns: 1fr 1fr;
  }
}

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

.benefit-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.benefit-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-cyan);
}

.benefit-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.benefit-icon-wrap {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(0, 240, 255, 0.1);
  color: var(--cyber-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(0, 240, 255, 0.2);
}

.benefit-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--text-muted);
}

.benefit-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 8px;
}

.benefit-desc {
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* ====================================================================
   流媒体与 AI 支持矩阵 (Matrix)
   ==================================================================== */
.matrix-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 768px) {
  .matrix-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.matrix-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--shadow-card);
}

.matrix-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.matrix-icon-box {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  color: var(--cyber-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
}

.matrix-card-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-main);
}

.matrix-card-desc {
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 22px;
}

.matrix-chips-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.matrix-chip {
  display: inline-flex;
  align-items: center;
  padding: 6px 16px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-secondary);
  transition: all 0.2s ease;
}

.matrix-chip:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.3);
}

.matrix-chip.highlight {
  background: rgba(0, 240, 255, 0.12);
  color: var(--cyber-cyan);
  border-color: var(--border-cyan);
  box-shadow: 0 0 12px rgba(0, 240, 255, 0.18);
}

/* ====================================================================
   真实使用场景卡 (Scenario Cards)
   ==================================================================== */
.scenarios-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 860px) {
  .scenarios-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.scenario-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.scenario-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-cyan);
}

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

.scenario-device {
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: rgba(0, 240, 255, 0.1);
  color: var(--cyber-cyan);
  border: 1px solid var(--border-cyan);
}

.scenario-tag {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
}

.scenario-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 10px;
}

.scenario-desc {
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* ====================================================================
   定价区 (Pricing Grid)
   ==================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: stretch;
}

@media (min-width: 860px) {
  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.price-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 34px 26px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.25s ease;
}

.price-card:hover {
  transform: translateY(-2px);
}

.price-card.popular {
  background: linear-gradient(180deg, rgba(12, 19, 34, 0.95) 0%, rgba(19, 28, 49, 0.95) 100%);
  border: 2px solid var(--cyber-cyan);
  box-shadow: 0 16px 40px -6px rgba(0, 0, 0, 0.8), 0 0 30px rgba(0, 240, 255, 0.25);
  animation: borderRotate 6s ease-in-out infinite;
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #00f0ff 0%, #a855f7 100%);
  color: #020617;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: var(--radius-pill);
  white-space: nowrap;
  letter-spacing: 0.04em;
  box-shadow: 0 0 16px rgba(0, 240, 255, 0.4);
}

.price-tier-header {
  margin-bottom: 16px;
}

.price-tier-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-main);
}

.price-tier-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.price-rate-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.price-symbol {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--cyber-cyan);
}

.price-val {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-main);
  font-family: var(--font-mono);
}

.price-cycle {
  font-size: 0.92rem;
  color: var(--text-muted);
}

.price-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 30px;
  flex-grow: 1;
}

.price-feature-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.price-feature-row svg {
  width: 17px;
  height: 17px;
  color: var(--cyber-cyan);
  flex-shrink: 0;
}

/* ====================================================================
   常见问题 (FAQ 手风琴)
   ==================================================================== */
.faq-wrap {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all 0.2s ease;
}

.faq-item.is-open {
  border-color: var(--border-cyan);
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.12);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
}

.faq-icon {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

.faq-item.is-open .faq-icon {
  transform: rotate(180deg);
  color: var(--cyber-cyan);
}

.faq-answer {
  display: none;
  padding: 0 24px 22px 24px;
  font-size: 0.96rem;
  line-height: 1.75;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}

.faq-item.is-open .faq-answer {
  display: block;
}

/* ====================================================================
   Final CTA 模块
   ==================================================================== */
.final-cta-section {
  padding: 72px 0;
  background: linear-gradient(135deg, #090e1c 0%, #060913 100%);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  color: #ffffff;
  text-align: center;
  position: relative;
}

.final-cta-wrap {
  max-width: 700px;
  margin: 0 auto;
}

.final-cta-title {
  font-size: 2.2rem;
  font-weight: 900;
  margin-bottom: 14px;
  color: #ffffff;
}

.final-cta-desc {
  font-size: 1.08rem;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: 30px;
}

/* ====================================================================
   全站页脚 (Site Footer)
   ==================================================================== */
.site-footer {
  background-color: #04060d;
  border-top: 1px solid var(--border-color);
  padding: 56px 0 32px 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  margin-bottom: 40px;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 1.6fr 1fr 1fr;
  }
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-desc {
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.footer-affiliate-note {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer-heading {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.footer-link:hover {
  color: var(--cyber-cyan);
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  font-size: 0.84rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-align: center;
}

@media (min-width: 640px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

/* ====================================================================
   移动端吸底 CTA
   ==================================================================== */
.mobile-sticky-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 99;
  background: rgba(12, 19, 34, 0.94);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--border-subtle);
  padding: 12px 18px;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.6);
}

@media (max-width: 767px) {
  .mobile-sticky-bar.is-visible {
    display: flex;
  }
}

.sticky-info {
  display: flex;
  flex-direction: column;
}

.sticky-brand {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--text-main);
}

.sticky-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.sticky-btn {
  padding: 8px 20px;
  font-size: 0.92rem;
}

/* ====================================================================
   文章与内页排版 (Article & Content Layout)
   ==================================================================== */
.breadcrumb-nav {
  padding: 24px 0 12px 0;
}

.breadcrumb-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.breadcrumb-separator {
  color: var(--border-subtle);
}

.breadcrumb-item.active {
  color: var(--text-secondary);
}

.article-header {
  padding: 16px 0 26px 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 30px;
}

.article-title {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1.35;
  margin-bottom: 14px;
}

.article-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.article-content-container {
  max-width: 840px;
  margin: 0 auto;
  padding-bottom: 48px;
}

.article-lead {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-main);
  background: rgba(0, 240, 255, 0.06);
  border-left: 4px solid var(--cyber-cyan);
  padding: 20px 24px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 34px;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
}

.article-body {
  font-size: 1.04rem;
  line-height: 1.88;
  color: var(--text-secondary);
}

.article-body h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-main);
  margin-top: 44px;
  margin-bottom: 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 30px;
  margin-bottom: 12px;
}

.article-body p {
  margin-bottom: 18px;
}

.article-body ul, .article-body ol {
  margin-bottom: 22px;
  padding-left: 24px;
}

.article-body li {
  margin-bottom: 8px;
}

.article-body strong {
  color: #ffffff;
}

.article-cta-box {
  background: linear-gradient(135deg, #131c31 0%, #0c1322 100%);
  border: 1px solid var(--border-cyan);
  border-radius: var(--radius-lg);
  padding: 34px 30px;
  text-align: center;
  color: #ffffff;
  margin: 46px 0 34px 0;
  box-shadow: 0 0 30px rgba(0, 240, 255, 0.15);
}

.article-cta-title {
  font-size: 1.45rem;
  font-weight: 800;
  margin-bottom: 10px;
  color: #ffffff;
}

.article-cta-desc {
  font-size: 0.98rem;
  color: var(--text-secondary);
  margin-bottom: 22px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.article-internal-links {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 26px;
  margin-top: 38px;
}

.internal-links-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 14px;
}

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

.internal-links-list li a {
  font-size: 0.94rem;
  color: var(--cyber-cyan);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.internal-links-list li a:hover {
  text-decoration: underline;
}

/* 简易表格 */
.table-wrap {
  overflow-x: auto;
  margin: 24px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.94rem;
}

th, td {
  padding: 12px 18px;
  border: 1px solid var(--border-color);
  text-align: left;
}

th {
  background: rgba(255, 255, 255, 0.04);
  font-weight: 800;
  color: var(--text-main);
}

/* 指南卡片专属排版 */
.guide-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.guide-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-cyan);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.6), 0 0 20px rgba(0, 240, 255, 0.18);
}

.guide-thumb-wrap {
  width: 100%;
  height: 120px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.1) 0%, rgba(192, 132, 252, 0.1) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  border: 1px solid var(--border-color);
}

.guide-thumb-svg {
  width: 48px;
  height: 48px;
  color: var(--cyber-cyan);
}

.guide-card-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 10px;
}

.guide-card-title a {
  color: var(--text-main);
}

.guide-card-title a:hover {
  color: var(--cyber-cyan);
}

.guide-card-desc {
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 16px;
  flex-grow: 1;
}

.guide-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-muted);
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
  margin-top: auto;
}

.guide-read-link {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--cyber-cyan);
  display: inline-flex;
  align-items: center;
}

.guide-read-link:hover {
  text-decoration: underline;
}

/* 无障碍偏好设置 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}