/* ==========================================================================
   龙猫云 (Totoro Cloud) - 极简云境 (Ethereal Aerosol Cloud-Minimalism)
   超纯北欧克制色系 | 纯原生 CSS | 0 重型外部依赖 | 秒开性能与极速专线体验
   ========================================================================== */

:root {
  /* 默认：白天模式 (Scandinavian Cloud-Fluff Light Palette) */
  --bg-primary: #fbfcfe;            /* Boundless cloud-fluff white */
  --bg-secondary: #ffffff;
  --bg-vapor: #e5e9f0;              /* Subtle vapor mist grey */
  --bg-vapor-light: #f1f4f8;
  --bg-card: rgba(255, 255, 255, 0.75);
  --bg-card-hover: rgba(255, 255, 255, 0.95);
  --bg-nav: rgba(251, 252, 254, 0.82);

  --border-vapor: rgba(229, 233, 240, 0.7);
  --border-subtle: rgba(203, 213, 225, 0.45);
  --border-focus: #0284c7;

  --text-main: #0f172a;
  --text-muted: #526075;
  --text-dim: #94a3b8;

  /* Cool Glacier Sky Accents (Strictly zero AI sparkles) */
  --glacier: #0284c7;
  --glacier-hover: #0369a1;
  --glacier-sky: #38bdf8;
  --glacier-mist: #e0f2fe;
  --glacier-glow: rgba(56, 189, 248, 0.16);

  --badge-bg: rgba(224, 242, 254, 0.6);
  --badge-text: #0369a1;

  --card-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.03), 0 2px 6px -1px rgba(15, 23, 42, 0.02);
  --card-shadow-hover: 0 16px 36px -6px rgba(2, 132, 199, 0.08), 0 4px 12px -2px rgba(15, 23, 42, 0.03);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;

  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  /* 暗黑模式 (Nordic Polar Night & Ice Mist) */
  --bg-primary: #090e17;            /* Deep Nordic night */
  --bg-secondary: #0f1726;
  --bg-vapor: #1e293b;
  --bg-vapor-light: #162032;
  --bg-card: rgba(15, 23, 38, 0.72);
  --bg-card-hover: rgba(22, 32, 50, 0.9);
  --bg-nav: rgba(9, 14, 23, 0.85);

  --border-vapor: rgba(255, 255, 255, 0.07);
  --border-subtle: rgba(255, 255, 255, 0.12);
  --border-focus: #38bdf8;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --glacier: #38bdf8;
  --glacier-hover: #7dd3fc;
  --glacier-sky: #0284c7;
  --glacier-mist: rgba(56, 189, 248, 0.12);
  --glacier-glow: rgba(56, 189, 248, 0.22);

  --badge-bg: rgba(56, 189, 248, 0.12);
  --badge-text: #7dd3fc;

  --card-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.45);
  --card-shadow-hover: 0 20px 40px -10px rgba(56, 189, 248, 0.2);
}

/* 基础重置与平滑滚动 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px; /* 避开固定导航栏高度 */
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text-main);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

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

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

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

/* 容器与无边框负空间结构 */
.container {
  width: 100%;
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 28px;
}

/* 头部导航栏 */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--bg-nav);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-vapor);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

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

.logo:hover .logo-img {
  transform: scale(1.04);
}

.logo-img-light {
  display: block;
}
.logo-img-dark {
  display: none;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-link {
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  padding: 6px 4px;
  transition: color var(--transition-normal);
}

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

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0%;
  height: 2px;
  background-color: var(--glacier);
  transition: width var(--transition-normal);
  border-radius: var(--radius-full);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 80%;
}

/* 推荐资讯特别高亮徽章 */
.nav-badge-pill {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  background: var(--badge-bg);
  color: var(--badge-text);
  margin-left: 4px;
  vertical-align: middle;
}

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

/* 昼夜模式切换开关 - 精致通透与专业触感 */
.theme-toggle-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-vapor);
  color: var(--text-main);
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all var(--transition-normal);
  box-shadow: var(--card-shadow);
  position: relative;
}

.theme-toggle-btn:hover {
  border-color: var(--border-focus);
  color: var(--glacier);
  transform: translateY(-2px);
  box-shadow: var(--card-shadow-hover);
}

.theme-toggle-btn svg {
  width: 19px;
  height: 19px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.theme-toggle-btn .icon-moon {
  display: block;
}
.theme-toggle-btn .icon-sun {
  display: none;
}

[data-theme="dark"] .theme-toggle-btn .icon-moon {
  display: none;
}
[data-theme="dark"] .theme-toggle-btn .icon-sun {
  display: block;
}

.mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-main);
  padding: 8px;
  cursor: pointer;
}

/* 按钮基础类 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 10px 24px;
  border-radius: var(--radius-full);
  transition: all var(--transition-normal);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  color: #ffffff;
  box-shadow: 0 4px 18px var(--glacier-glow);
}

[data-theme="dark"] .btn-primary {
  background: linear-gradient(135deg, #38bdf8 0%, #0284c7 100%);
  color: #090e17;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 26px var(--glacier-glow);
  color: #ffffff;
}
[data-theme="dark"] .btn-primary:hover {
  color: #090e17;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-vapor);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  border-color: var(--border-focus);
  color: var(--glacier);
  transform: translateY(-2px);
  background: var(--bg-card-hover);
}

.btn-lg {
  padding: 14px 34px;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

/* 主视觉区 (Hero Section - Ethereal Aerosol Cloud Aesthetics) */
.hero-section {
  position: relative;
  padding: 80px 0 60px;
  text-align: center;
  overflow: hidden;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--badge-bg);
  color: var(--badge-text);
  padding: 6px 18px;
  border-radius: var(--radius-full);
  font-size: 0.86rem;
  font-weight: 600;
  margin-bottom: 24px;
  border: 1px solid rgba(56, 189, 248, 0.25);
  backdrop-filter: blur(8px);
}

.hero-pill-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: #10b981;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.035em;
  margin-bottom: 20px;
  color: var(--text-main);
}

.hero-title .brand-accent {
  background: linear-gradient(135deg, var(--glacier) 0%, var(--glacier-sky) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.hero-intro {
  max-width: 820px;
  margin: 0 auto 36px;
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text-muted);
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 44px;
  flex-wrap: wrap;
}

/* 核心云雾粒子色散交互区 (Aerosol Cloud Dispersion Sculpture & Diagnostics HUD) */
.cloud-sculpture-wrapper {
  position: relative;
  max-width: 980px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border-vapor);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  box-shadow: var(--card-shadow);
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 底层高精等宽服务诊断数据层 (Crisp Monospace Server Diagnostics) */
.diagnostics-hud {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  padding: 24px 28px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.85rem;
  line-height: 1.8;
  color: var(--text-muted);
  text-align: left;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  pointer-events: none;
  z-index: 1;
  opacity: 0.85;
}

.hud-row {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.hud-tag {
  color: var(--glacier);
  font-weight: 700;
}

.hud-green {
  color: #10b981;
}

/* 顶层液态云雾粒子 Canvas (Mouse Updraft Fluid Dispersion) */
#cloudCanvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2;
  cursor: crosshair;
}

.cloud-hint {
  position: absolute;
  bottom: 12px;
  right: 18px;
  z-index: 3;
  font-size: 0.76rem;
  color: var(--text-dim);
  font-family: ui-monospace, monospace;
  pointer-events: none;
  display: flex;
  align-items: center;
  gap: 6px;
}

.cloud-hint-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--glacier);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.6; }
  50% { transform: scale(1.15); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.6; }
}

/* 信任指标/数据横幅 */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 980px;
  margin: 32px auto 0;
  padding: 20px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-vapor);
  border-radius: var(--radius-md);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.03em;
}

.stat-value span {
  color: var(--glacier);
  font-size: 1.25rem;
}

.stat-label {
  font-size: 0.86rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* 通用区块排版 (负空间无生硬线框) */
.section {
  padding: 88px 0;
}

.section-alt {
  background-color: var(--bg-vapor-light);
}

[data-theme="dark"] .section-alt {
  background-color: rgba(15, 23, 38, 0.4);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 52px;
}

.section-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--glacier);
  margin-bottom: 10px;
  text-transform: uppercase;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.025em;
  line-height: 1.3;
  margin-bottom: 14px;
}

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

/* 核心优势卡片 (3个图文卡片) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-vapor);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  box-shadow: var(--card-shadow);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-focus);
  box-shadow: var(--card-shadow-hover);
}

.feature-card-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: var(--glacier-mist);
  color: var(--glacier);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  transition: transform var(--transition-normal);
}

.feature-card:hover .feature-card-icon {
  transform: scale(1.08);
}

.feature-card-icon svg {
  width: 28px;
  height: 28px;
}

.feature-card-title {
  font-size: 1.32rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
  letter-spacing: -0.01em;
}

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

.feature-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.feature-card-tag {
  font-size: 0.78rem;
  font-weight: 500;
  padding: 4px 10px;
  background: var(--bg-vapor);
  color: var(--text-muted);
  border-radius: var(--radius-full);
}

[data-theme="dark"] .feature-card-tag {
  background: rgba(255, 255, 255, 0.06);
}

/* 流媒体与 AI 支持图卡 */
.media-ai-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.media-ai-box {
  background: var(--bg-card);
  border: 1px solid var(--border-vapor);
  border-radius: var(--radius-lg);
  padding: 38px;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.box-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}

.box-header-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: var(--glacier-mist);
  color: var(--glacier);
  display: flex;
  align-items: center;
  justify-content: center;
}

.box-header-icon svg {
  width: 24px;
  height: 24px;
}

.box-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-main);
}

.box-subtitle {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.box-desc {
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 24px;
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: auto;
}

.platform-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: var(--bg-primary);
  border: 1px solid var(--border-vapor);
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
}

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

.platform-icon {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-weight: 700;
  font-size: 0.85rem;
}

.platform-info h4 {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.2;
}

.platform-info p {
  font-size: 0.76rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.p-netflix { background: #e50914; color: #fff; }
.p-disney { background: #113ccf; color: #fff; }
.p-youtube { background: #ff0000; color: #fff; }
.p-hbo { background: #5822b4; color: #fff; }
.p-chatgpt { background: #10a37f; color: #fff; }
.p-claude { background: #d97706; color: #fff; }
.p-midjourney { background: #0284c7; color: #fff; }
.p-gemini { background: #4f46e5; color: #fff; }

/* 价格表 - 参考网上真实机场套餐定价 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-vapor);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-shadow-hover);
}

.pricing-card.featured {
  border-color: var(--glacier);
  background: var(--bg-card-hover);
  box-shadow: 0 16px 36px -10px var(--glacier-glow);
  transform: scale(1.02);
}

.pricing-card.featured:hover {
  transform: scale(1.02) translateY(-6px);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--glacier), var(--glacier-sky));
  color: #ffffff;
  padding: 4px 18px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  box-shadow: 0 4px 12px var(--glacier-glow);
}

.plan-header {
  margin-bottom: 24px;
  text-align: center;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.plan-price-box {
  margin: 20px 0 10px;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}

.plan-currency {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
}

.plan-amount {
  font-size: 3rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1;
  letter-spacing: -0.03em;
}

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

.plan-billing-cycle {
  font-size: 0.82rem;
  color: var(--glacier);
  font-weight: 600;
  margin-bottom: 12px;
}

.plan-features-list {
  list-style: none;
  margin: 24px 0 32px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.94rem;
  color: var(--text-main);
}

.plan-feature-item svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  color: #10b981;
}

.plan-feature-item.disabled {
  color: var(--text-dim);
  text-decoration: line-through;
}

.plan-feature-item.disabled svg {
  color: var(--text-dim);
}

.pricing-btn {
  width: 100%;
}

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

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-vapor);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

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

.review-stars {
  display: flex;
  gap: 3px;
  color: #f59e0b;
  margin-bottom: 16px;
}

.review-stars svg {
  width: 17px;
  height: 17px;
  fill: currentColor;
}

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

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-vapor);
  padding-top: 16px;
}

.author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--glacier), var(--glacier-sky));
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
}

.author-info h5 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
}

.author-info p {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* 常见问题解答 (FAQ) */
.faq-container {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-vapor);
  border-radius: var(--radius-md);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  transition: border-color var(--transition-normal);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

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

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  background: transparent;
  text-align: left;
}

.faq-question svg {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  transition: transform var(--transition-normal);
  flex-shrink: 0;
}

.faq-item.active .faq-question svg {
  transform: rotate(180deg);
  color: var(--glacier);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  background: var(--bg-primary);
}

.faq-item.active .faq-answer {
  max-height: 400px;
}

.faq-answer-inner {
  padding: 0 24px 20px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* 底部 CTA 转化横幅 */
.cta-banner {
  margin: 40px auto 0;
  max-width: 1000px;
  padding: 52px 36px;
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.06), rgba(56, 189, 248, 0.08));
  border: 1px solid var(--border-vapor);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.cta-banner h3 {
  font-size: 1.9rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.cta-banner p {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: 28px;
  max-width: 620px;
  margin-left: auto;
  margin-right: auto;
}

/* 页脚 (Footer) - 严格只保留四个标题 */
.footer {
  margin-top: auto;
  border-top: 1px solid var(--border-vapor);
  background-color: var(--bg-secondary);
  padding: 48px 0 32px;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  list-style: none;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.footer-nav-link {
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text-main);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-normal);
}

.footer-nav-link:hover {
  color: var(--glacier);
  background: var(--glacier-mist);
}

.footer-copyright {
  text-align: center;
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* 资讯页面专用卡片排版 (insights-a7x9.html) */
.insights-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin: 36px 0;
}

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

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

.insight-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-bottom: 14px;
}

.insight-tag {
  color: var(--glacier);
  font-weight: 600;
  background: var(--glacier-mist);
  padding: 2px 10px;
  border-radius: var(--radius-full);
}

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

.insight-summary {
  font-size: 0.94rem;
  color: var(--text-muted);
  line-height: 1.7;
  flex-grow: 1;
  margin-bottom: 20px;
}

.insight-readmore {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--glacier);
  font-weight: 600;
  font-size: 0.92rem;
}

.insight-readmore:hover {
  gap: 10px;
}

/* 附属页面基础类 */
.page-container {
  max-width: 880px;
  margin: 40px auto 80px;
  padding: 0 28px;
}

.page-header {
  border-bottom: 1px solid var(--border-vapor);
  padding-bottom: 24px;
  margin-bottom: 36px;
}

.page-title {
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 10px;
}

.page-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
}

.page-content {
  line-height: 1.8;
  color: var(--text-main);
}

.page-content h2 {
  font-size: 1.55rem;
  font-weight: 700;
  margin: 36px 0 16px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-content p {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.page-content ul, .page-content ol {
  margin: 0 0 20px 24px;
  color: var(--text-muted);
}

.page-content li {
  margin-bottom: 8px;
}

.notice-box {
  background: var(--bg-card);
  border-left: 4px solid var(--glacier);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  margin: 24px 0;
  box-shadow: var(--card-shadow);
}

.notice-box.danger {
  border-left-color: #ef4444;
  background: rgba(239, 68, 68, 0.05);
}

.notice-box.success {
  border-left-color: #10b981;
  background: rgba(16, 185, 129, 0.05);
}

/* 网站地图 */
.sitemap-group {
  margin-bottom: 32px;
}

.sitemap-links-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 14px;
}

.sitemap-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-vapor);
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
}

.sitemap-item:hover {
  border-color: var(--border-focus);
  transform: translateX(4px);
  color: var(--glacier);
}

/* 响应式媒体查询 */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.8rem;
  }
  .features-grid,
  .pricing-grid,
  .reviews-grid,
  .insights-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }
}

@media (max-width: 768px) {
  .header {
    height: 64px;
  }
  .nav {
    height: 64px;
  }

  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-vapor);
    flex-direction: column;
    padding: 24px;
    gap: 18px;
    box-shadow: var(--card-shadow);
    transform: translateY(-150%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s ease, opacity 0.3s ease;
    z-index: 999;
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .mobile-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .hero-section {
    padding: 50px 0 35px;
  }

  .hero-title {
    font-size: 2.15rem;
  }

  .hero-subtitle {
    font-size: 1.15rem;
  }

  .hero-intro {
    font-size: 0.98rem;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .cloud-sculpture-wrapper {
    min-height: 260px;
  }

  .diagnostics-hud {
    font-size: 0.74rem;
    padding: 16px;
  }

  .features-grid,
  .media-ai-container,
  .pricing-grid,
  .reviews-grid,
  .insights-grid,
  .platform-grid,
  .sitemap-links-grid {
    grid-template-columns: 1fr;
  }

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

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

  .footer-nav {
    gap: 18px;
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .logo-img {
    height: 34px;
  }
  .logo span {
    display: none;
  }
}

/* ==========================================================================
   深度 SEO 长文专有样式 (Table of Contents, Breadcrumbs, FAQ, Related Posts)
   ========================================================================== */

.article-wrap {
  max-width: 900px;
  margin: 36px auto 80px;
  padding: 0 24px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--text-dim);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

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

.breadcrumb a:hover {
  color: var(--glacier);
}

.article-header {
  border-bottom: 1px solid var(--border-vapor);
  padding-bottom: 28px;
  margin-bottom: 32px;
}

.article-badge-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.article-h1 {
  font-size: 2.35rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.3;
  letter-spacing: -0.025em;
  margin-bottom: 16px;
}

.article-meta-info {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

/* 目录容器 (Table of Contents) */
.article-toc {
  background: var(--bg-card);
  border: 1px solid var(--border-vapor);
  border-left: 4px solid var(--glacier);
  border-radius: var(--radius-md);
  padding: 22px 26px;
  margin: 32px 0 40px;
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.toc-title {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0;
  padding: 0;
}

.toc-item a {
  font-size: 0.94rem;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-normal);
}

.toc-item a:hover {
  color: var(--glacier);
  transform: translateX(4px);
}

.toc-item.nested {
  padding-left: 20px;
  font-size: 0.9rem;
}

/* 文章正文排版 */
.article-body {
  font-size: 1.04rem;
  line-height: 1.85;
  color: var(--text-main);
}

.article-body h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 44px 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-vapor);
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 30px 0 14px;
  letter-spacing: -0.01em;
}

.article-body p {
  margin-bottom: 20px;
  color: var(--text-muted);
}

.article-body strong {
  color: var(--text-main);
  font-weight: 700;
}

.article-body ul, .article-body ol {
  margin: 0 0 24px 28px;
  color: var(--text-muted);
}

.article-body li {
  margin-bottom: 10px;
  line-height: 1.75;
}

.article-body blockquote {
  border-left: 4px solid var(--glacier-sky);
  background: var(--bg-vapor-light);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  font-style: italic;
  color: var(--text-muted);
}

[data-theme="dark"] .article-body blockquote {
  background: rgba(15, 23, 38, 0.6);
}

/* 表格排版 (深度对比表) */
.article-table-wrap {
  overflow-x: auto;
  margin: 28px 0;
  border: 1px solid var(--border-vapor);
  border-radius: var(--radius-md);
  box-shadow: var(--card-shadow);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.94rem;
}

.article-table th {
  background: var(--bg-vapor-light);
  color: var(--text-main);
  font-weight: 700;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-vapor);
}

[data-theme="dark"] .article-table th {
  background: #111827;
}

.article-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-vapor);
  color: var(--text-muted);
}

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

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

/* 代码与配置块 */
.code-box {
  background: #0f172a;
  color: #e2e8f0;
  padding: 18px 22px;
  border-radius: var(--radius-md);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.88rem;
  line-height: 1.7;
  overflow-x: auto;
  margin: 24px 0;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* 文章内置内链突出样式 */
.article-inline-link {
  color: var(--glacier);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition-normal);
}

.article-inline-link:hover {
  color: var(--glacier-hover);
}

/* 文章专有 FAQ 区块 */
.article-faq-section {
  margin: 48px 0;
  padding-top: 24px;
  border-top: 1px solid var(--border-vapor);
}

/* 文章专有 相关阅读区块 */
.related-posts-section {
  margin: 52px 0 32px;
  padding-top: 32px;
  border-top: 1px solid var(--border-vapor);
}

.related-posts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 20px;
}

.related-card {
  background: var(--bg-card);
  border: 1px solid var(--border-vapor);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.related-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-focus);
}

.related-card h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 8px;
}

.related-card p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.6;
  flex-grow: 1;
  margin-bottom: 12px;
}

.related-link {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--glacier);
}

@media (max-width: 768px) {
  .article-h1 {
    font-size: 1.85rem;
  }
  .related-posts-grid {
    grid-template-columns: 1fr;
  }
}