/* ===================================================================
   IKUUU (ikuuu.rest) - 核心样式表
   电光极光 · 赛博高转化 · 动感 HUD 仪表盘 · 纯系统字体栈 · 移动优先
   =================================================================== */

:root {
  --bg-main: #060a12;
  --bg-card: #0d1424;
  --bg-card-hover: #131d33;
  --bg-header: rgba(6, 10, 18, 0.92);
  --bg-alt: #090f1b;
  --bg-hud: rgba(13, 20, 36, 0.95);
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(59, 130, 246, 0.35);
  --border-cyan: rgba(6, 182, 212, 0.35);
  --border-hover: rgba(59, 130, 246, 0.6);
  
  --text-main: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --primary: #2563eb;
  --primary-light: #3b82f6;
  --primary-dark: #1d4ed8;
  --cyan: #06b6d4;
  --cyan-bright: #22d3ee;
  --emerald: #10b981;
  --violet: #8b5cf6;

  --grad-primary: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
  --grad-hud-header: linear-gradient(90deg, rgba(37, 99, 235, 0.25) 0%, rgba(6, 182, 212, 0.1) 100%);
  --grad-card: linear-gradient(180deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0) 100%);
  --grad-card-featured: linear-gradient(180deg, rgba(37, 99, 235, 0.16) 0%, rgba(6, 182, 212, 0.04) 100%);
  --grad-meteor: linear-gradient(90deg, rgba(6, 182, 212, 0) 0%, rgba(37, 99, 235, 0.8) 60%, #ffffff 100%);
  --grad-shimmer: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.25) 50%, transparent 100%);

  --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow-blue: 0 0 30px rgba(37, 99, 235, 0.25);
  --shadow-glow-cyan: 0 0 25px rgba(6, 182, 212, 0.2);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-pill: 9999px;

  --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --container-max: 1180px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-stack);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-main);
  background-color: var(--bg-main);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-main);
  color: var(--text-main);
  position: relative;
  overflow-x: hidden;
}

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

img, svg {
  vertical-align: middle;
}

ul, ol {
  list-style: none;
}

/* ===================================================================
   容器与布局网格
   =================================================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.section {
  padding-top: 76px;
  padding-bottom: 76px;
  position: relative;
}

.section-alt {
  background-color: var(--bg-alt);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 48px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--cyan);
  background-color: rgba(6, 182, 212, 0.1);
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 14px;
  border: 1px solid var(--border-cyan);
  letter-spacing: 0.5px;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 14px;
  letter-spacing: -0.5px;
}

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

/* ===================================================================
   按钮组件与流光扫光微交互 (Buttons with Shimmer & Glow)
   =================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.96rem;
  font-weight: 700;
  padding: 11px 24px;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
  transition: all 0.25s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--grad-primary);
  color: #ffffff !important;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

/* 按钮微动态光影扫过效果 */
.btn-primary::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--grad-shimmer);
  transform: skewX(-25deg);
  animation: btnShimmer 4.5s infinite ease-in-out;
}

@keyframes btnShimmer {
  0% { left: -100%; }
  20%, 100% { left: 150%; }
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(6, 182, 212, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

.btn-primary:active {
  transform: translateY(0);
}

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

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

.btn-lg {
  font-size: 1.05rem;
  padding: 13px 30px;
  border-radius: var(--radius-md);
}

.btn-block {
  width: 100%;
}

/* ===================================================================
   顶部导航栏 (Site Header)
   =================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-header);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all 0.2s ease;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 900;
  color: #ffffff;
  letter-spacing: 0.5px;
}

.logo-symbol {
  width: 36px;
  height: 36px;
  background: var(--grad-primary);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-weight: 900;
  font-size: 1.15rem;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.4);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-link {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 600;
  padding: 6px 2px;
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: #ffffff;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--grad-primary);
  transition: all 0.25s ease;
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
  left: 0;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.menu-toggle {
  display: none;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.mobile-nav-drawer {
  display: none;
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-glow);
  padding: 18px 20px 24px;
}

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

.mobile-nav-link {
  display: block;
  padding: 12px 0;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.mobile-nav-link:hover {
  color: #ffffff;
}

/* ===================================================================
   动态 Hero 模块 (流星背景 + Asymmetric Bento + Live Telemetry HUD)
   =================================================================== */
.hero-section {
  padding-top: 64px;
  padding-bottom: 72px;
  position: relative;
  overflow: hidden;
  background: radial-gradient(circle at 50% 0%, rgba(37, 99, 235, 0.18) 0%, rgba(6, 182, 212, 0.04) 40%, transparent 75%);
}

/* 动态流星划过背景 (CSS Meteors) */
.hero-meteors-wrap {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  pointer-events: none;
  z-index: 1;
}

.meteor {
  position: absolute;
  width: 140px;
  height: 2px;
  background: var(--grad-meteor);
  border-radius: 999px;
  filter: drop-shadow(0 0 6px rgba(37, 99, 235, 0.8));
  transform: rotate(-35deg);
  opacity: 0;
  animation: meteorShower 6s linear infinite;
}

.meteor::after {
  content: "";
  position: absolute;
  right: 0;
  top: -1px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background-color: #ffffff;
  box-shadow: 0 0 8px #ffffff, 0 0 16px var(--cyan);
}

.meteor-1 { top: 10%; right: 12%; width: 160px; animation-delay: 0s; animation-duration: 4.6s; }
.meteor-2 { top: 32%; right: 40%; width: 130px; animation-delay: 1.8s; animation-duration: 4.2s; }
.meteor-3 { top: 48%; right: 15%; width: 170px; animation-delay: 3.4s; animation-duration: 5.2s; }
.meteor-4 { top: 20%; right: 65%; width: 140px; animation-delay: 4.2s; animation-duration: 4.8s; }
.meteor-5 { top: 62%; right: 30%; width: 150px; animation-delay: 2.6s; animation-duration: 5.5s; }

@keyframes meteorShower {
  0% { transform: rotate(-35deg) translateX(0); opacity: 0; }
  8% { opacity: 1; }
  32% { transform: rotate(-35deg) translateX(-640px); opacity: 0; }
  100% { transform: rotate(-35deg) translateX(-640px); opacity: 0; }
}

.hero-bento-grid {
  position: relative;
  z-index: 2;
  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;
    gap: 48px;
  }
}

.hero-text-wrap {
  text-align: left;
}

.hero-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--cyan);
  background-color: rgba(6, 182, 212, 0.1);
  border: 1px solid var(--border-cyan);
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  margin-bottom: 22px;
}

.pulse-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--emerald);
  position: relative;
}

.pulse-dot::after {
  content: "";
  position: absolute;
  top: -3px;
  left: -3px;
  right: -3px;
  bottom: -3px;
  border-radius: 50%;
  border: 2px solid var(--emerald);
  animation: beaconPulse 2s infinite ease-out;
}

@keyframes beaconPulse {
  0% { transform: scale(0.8); opacity: 1; }
  100% { transform: scale(2.4); opacity: 0; }
}

.hero-title {
  font-size: 2.6rem;
  font-weight: 900;
  line-height: 1.25;
  color: #ffffff;
  letter-spacing: -0.8px;
  margin-bottom: 20px;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.72;
  max-width: 620px;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 34px;
}

.hero-feature-tags {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  padding-top: 22px;
  border-top: 1px solid var(--border-subtle);
}

.hero-tag-item {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.hero-tag-item svg {
  color: var(--cyan);
}

/* ===================================================================
   Telemetry HUD 监控面板 (Live Telemetry HUD Card)
   =================================================================== */
.hero-hud-card {
  background: var(--bg-hud);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.5), var(--shadow-glow-blue);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(12px);
}

.hero-hud-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--grad-primary);
}

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

.hud-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 800;
  letter-spacing: 0.8px;
  color: var(--cyan);
}

.hud-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--emerald);
  background-color: rgba(16, 185, 129, 0.12);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

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

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

.hud-metric-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.hud-metric-val {
  font-size: 1.55rem;
  font-weight: 900;
  color: #ffffff;
  line-height: 1;
}

.hud-route-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin-bottom: 16px;
}

.hud-route-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background-color: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-sm);
  font-size: 0.86rem;
}

.hud-route-name {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-main);
  font-weight: 600;
}

.hud-route-tag {
  color: var(--cyan);
  font-family: monospace;
  font-size: 0.82rem;
}

.hud-route-ping {
  color: var(--emerald);
  font-weight: 700;
  font-family: monospace;
}

.hud-activity-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.hud-progress-track {
  flex-grow: 1;
  height: 6px;
  background-color: rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-pill);
  overflow: hidden;
  position: relative;
}

.hud-progress-fill {
  width: 94%;
  height: 100%;
  background: var(--grad-primary);
  border-radius: var(--radius-pill);
  position: relative;
}

.hud-progress-fill::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--grad-shimmer);
  animation: hudPulse 2.5s infinite linear;
}

@keyframes hudPulse {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* ===================================================================
   模块 1：流媒体与 AI 应用矩阵 (Matrix)
   =================================================================== */
.matrix-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.matrix-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 26px;
  transition: all 0.25s ease;
  position: relative;
}

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

.matrix-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.matrix-icon-box {
  width: 44px;
  height: 44px;
  background: rgba(37, 99, 235, 0.12);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan);
}

.matrix-title {
  font-size: 1.18rem;
  font-weight: 700;
  color: #ffffff;
}

.matrix-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.matrix-pill {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 11px;
  border-radius: var(--radius-sm);
  background-color: rgba(255, 255, 255, 0.04);
  color: var(--text-secondary);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

/* ===================================================================
   模块 2：Bento Grid 核心特性卡 (Bento Features)
   =================================================================== */
.features-bento-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 860px) {
  .features-bento-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.bento-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all 0.25s ease;
  position: relative;
  display: flex;
  flex-direction: column;
}

.bento-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-hover);
  background-color: var(--bg-card-hover);
  box-shadow: var(--shadow-glow-blue);
}

.bento-card-wide {
  grid-column: 1 / -1;
  background: var(--grad-card);
}

.bento-card-tag {
  font-size: 0.82rem;
  font-weight: 800;
  font-family: monospace;
  color: var(--cyan);
  margin-bottom: 12px;
  display: inline-block;
}

.bento-card-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 12px;
}

.bento-card-desc {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.68;
  margin-bottom: 18px;
  flex-grow: 1;
}

.bento-check-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.bento-check-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.bento-check-item svg {
  color: var(--emerald);
  flex-shrink: 0;
}

/* ===================================================================
   模块 3：真实使用场景 (4 卡)
   =================================================================== */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.scenario-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: all 0.25s ease;
}

.scenario-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-sm);
}

.scenario-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--emerald);
  background-color: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
  align-self: flex-start;
}

.scenario-title {
  font-size: 1.22rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 8px;
}

.scenario-device {
  font-size: 0.88rem;
  color: var(--cyan);
  margin-bottom: 14px;
  font-weight: 600;
}

.scenario-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.62;
  flex-grow: 1;
}

/* ===================================================================
   模块 4：网络架构与性能优势 (Benefits)
   =================================================================== */
.benefits-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 44px;
  box-shadow: var(--shadow-md);
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.benefit-item {
  position: relative;
}

.benefit-num {
  font-size: 2rem;
  font-weight: 900;
  color: var(--cyan);
  margin-bottom: 8px;
  line-height: 1;
  font-family: monospace;
}

.benefit-item h3 {
  font-size: 1.18rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 8px;
}

.benefit-item p {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ===================================================================
   模块 5：套餐方案 (Pricing: 3 档)
   =================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.25s ease;
}

.pricing-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.pricing-card.featured {
  border-color: var(--primary-light);
  background: var(--grad-card-featured);
  box-shadow: 0 12px 36px rgba(37, 99, 235, 0.28), var(--shadow-glow-cyan);
}

.pricing-ribbon {
  position: absolute;
  top: -12px;
  right: 24px;
  background: var(--grad-primary);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.5px;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
}

.pricing-target {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--cyan);
  margin-bottom: 6px;
}

.pricing-name {
  font-size: 1.5rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 16px;
}

.pricing-price {
  display: flex;
  align-items: baseline;
  margin-bottom: 12px;
}

.currency {
  font-size: 1.35rem;
  font-weight: 700;
  color: #ffffff;
  margin-right: 2px;
}

.amount {
  font-size: 2.7rem;
  font-weight: 900;
  color: #ffffff;
  line-height: 1;
}

.period {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-left: 6px;
}

.pricing-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  min-height: 44px;
}

.pricing-features {
  margin-bottom: 28px;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

/* ===================================================================
   模块 6：常见问题解答 (FAQ 手风琴)
   =================================================================== */
.faq-wrap {
  max-width: 820px;
  margin-left: auto;
  margin-right: auto;
}

.faq-item {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: all 0.2s ease;
}

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

.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
}

.faq-icon {
  font-size: 1.35rem;
  color: var(--text-secondary);
  transition: transform 0.25s ease;
  line-height: 1;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  color: var(--cyan);
}

.faq-answer {
  display: none;
  padding: 0 24px 22px;
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  display: block;
}

/* ===================================================================
   Final CTA 区块
   =================================================================== */
.final-cta-section {
  padding: 80px 0;
  background: linear-gradient(180deg, var(--bg-alt) 0%, #080f1e 100%);
  border-top: 1px solid var(--border-subtle);
  text-align: center;
}

.final-cta-card {
  max-width: 820px;
  margin-left: auto;
  margin-right: auto;
  padding: 52px 36px;
  background: radial-gradient(circle at 50% 0%, rgba(37, 99, 235, 0.28) 0%, var(--bg-card) 75%);
  border: 1px solid var(--border-hover);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-glow-blue);
}

.final-cta-title {
  font-size: 2.35rem;
  font-weight: 900;
  color: #ffffff;
  margin-bottom: 16px;
}

.final-cta-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 620px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 32px;
}

/* ===================================================================
   移动端吸底 CTA
   =================================================================== */
.sticky-mobile-cta {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background-color: var(--bg-header);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--border-glow);
  padding: 12px 20px;
  z-index: 99;
}

/* ===================================================================
   页脚 (Footer)
   =================================================================== */
.site-footer {
  background-color: #04070e;
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0 36px;
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-nav a:hover {
  color: #ffffff;
}

.footer-middle {
  padding: 24px 0;
  font-size: 0.86rem;
  line-height: 1.65;
  color: var(--text-muted);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.84rem;
  color: var(--text-muted);
}

/* ===================================================================
   文章排版样式 (Prose & Guides)
   =================================================================== */
.article-header {
  padding: 56px 0 36px;
  background-color: var(--bg-alt);
  border-bottom: 1px solid var(--border-subtle);
}

.breadcrumb {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

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

.breadcrumb a:hover {
  color: #ffffff;
}

.article-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.3;
  margin-bottom: 16px;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.article-body {
  padding: 48px 0 80px;
}

.content-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 44px;
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
}

.prose {
  font-size: 1.02rem;
  line-height: 1.82;
  color: #cbd5e1;
}

.prose p {
  margin-bottom: 22px;
}

.prose h2 {
  font-size: 1.55rem;
  font-weight: 800;
  color: #ffffff;
  margin-top: 40px;
  margin-bottom: 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.prose h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: #f1f5f9;
  margin-top: 26px;
  margin-bottom: 14px;
}

.prose ul, .prose ol {
  margin-bottom: 24px;
  padding-left: 24px;
}

.prose ul {
  list-style-type: disc;
}

.prose ol {
  list-style-type: decimal;
}

.prose li {
  margin-bottom: 10px;
}

.prose strong {
  color: #ffffff;
  font-weight: 700;
}

.prose a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose a:hover {
  color: var(--cyan-bright);
}

.lead-paragraph {
  font-size: 1.15rem;
  line-height: 1.82;
  color: #e2e8f0;
  padding: 22px 26px;
  background-color: rgba(37, 99, 235, 0.1);
  border-left: 4px solid var(--primary-light);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-bottom: 32px;
}

.callout-box {
  background-color: var(--bg-alt);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 28px 0;
}

.callout-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 10px;
}

.article-bottom-cta {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.18), rgba(6, 182, 212, 0.12));
  border: 1px solid var(--border-hover);
  border-radius: var(--radius-md);
  padding: 30px;
  text-align: center;
  margin: 40px 0 32px;
}

.related-articles {
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.related-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 16px;
}

.related-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.related-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  background-color: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
}

.related-link:hover {
  background-color: rgba(255, 255, 255, 0.06);
  border-color: var(--border-hover);
  color: #ffffff;
}

/* ===================================================================
   响应式断点 (Media Queries)
   =================================================================== */
@media (max-width: 992px) {
  .hero-title {
    font-size: 2.3rem;
  }
  .benefits-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
  }
  .site-nav {
    display: none;
  }
  .menu-toggle {
    display: block;
  }
}

@media (max-width: 768px) {
  .section {
    padding-top: 52px;
    padding-bottom: 52px;
  }
  .hero-title {
    font-size: 1.95rem;
  }
  .hero-subtitle {
    font-size: 1.05rem;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .content-box {
    padding: 24px 18px;
  }
  .sticky-mobile-cta {
    display: block;
  }
  body {
    padding-bottom: 60px;
  }
}