/* ==========================================================================
   TAG Cloud Network - Liquid Glass & Glassmorphism Theme
   Pure Native CSS - Ultra-fast, zero-dependency, fully responsive
   ========================================================================== */

:root {
  /* 品牌指定配色 */
  --bg-gradient: linear-gradient(135deg, #F0F4FF 0%, #E0E7FF 50%, #F5E8FF 100%);
  --color-primary: #6366F1;     /* 靛蓝 */
  --color-secondary: #06B6D4;   /* 青色 */
  --color-purple: #8B5CF6;

  /* 渐变与按钮高光 */
  --gradient-brand: linear-gradient(135deg, #6366F1 0%, #06B6D4 100%);
  --gradient-brand-hover: linear-gradient(135deg, #4f46e5 0%, #0891b2 100%);
  --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.7) 0%, rgba(255, 255, 255, 0.3) 100%);

  /* 液态玻璃拟态卡片背景与边框 */
  --glass-bg: rgba(255, 255, 255, 0.65);
  --glass-bg-hover: rgba(255, 255, 255, 0.85);
  --glass-bg-active: rgba(255, 255, 255, 0.95);
  --glass-border: rgba(255, 255, 255, 0.85);
  --glass-border-subtle: rgba(99, 102, 241, 0.15);
  --glass-border-hover: rgba(99, 102, 241, 0.35);

  /* 清透高对比文字 */
  --text-main: #0f172a;       /* 深石板灰黑，清晰易读 */
  --text-heading: #1e1b4b;    /* 极深靛蓝，突出层级 */
  --text-muted: #475569;      /* 次级文本 */
  --text-dim: #64748b;        /* 辅助说明 */

  /* 玻璃拟态阴影 */
  --shadow-glass: 0 20px 40px -15px rgba(99, 102, 241, 0.1), 0 0 1px 1px rgba(255, 255, 255, 0.9) inset;
  --shadow-glass-hover: 0 25px 50px -12px rgba(99, 102, 241, 0.2), 0 0 2px 1px rgba(255, 255, 255, 1) inset;
  --shadow-cta: 0 10px 25px -4px rgba(99, 102, 241, 0.4), inset 0 1px 1px rgba(255, 255, 255, 0.5);
  --shadow-cta-hover: 0 15px 30px -4px rgba(6, 182, 212, 0.5), inset 0 1px 2px rgba(255, 255, 255, 0.7);

  /* 基础设置 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --radius-cta: 14px;         /* 指定 CTA 按钮圆角 14px */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base Setup */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
  font-size: 16px;
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

section, article, .faq-item, .seo-article-card {
  scroll-margin-top: 90px;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow-x: hidden;
  background: var(--bg-gradient);
  background-attachment: fixed;
  overflow-wrap: break-word;
  word-break: break-word;
}

/* 无障碍：跳转到主要内容快捷入口 */
.skip-link {
  position: absolute;
  top: -100px;
  left: 20px;
  background: var(--gradient-brand);
  color: #ffffff !important;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  z-index: 9999;
  transition: top 0.2s ease;
  text-decoration: none;
  box-shadow: 0 6px 18px rgba(99, 102, 241, 0.4);
}

.skip-link:focus {
  top: 20px;
  outline: 2px solid #ffffff;
}

/* 键盘可访问性焦点轮廓 */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: 4px;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

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

/* ==========================================================================
   背景动效：3 个大型 blur(80px) 彩色 blob 缓慢漂移和缩放
   ========================================================================== */
.blob-bg-container {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  -webkit-filter: blur(80px);
  opacity: 0.55;
  will-change: transform;
}

.blob-1 {
  width: 520px;
  height: 520px;
  top: -80px;
  left: -80px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.45) 0%, rgba(99, 102, 241, 0) 70%);
  animation: driftBlob1 22s ease-in-out infinite alternate;
}

.blob-2 {
  width: 600px;
  height: 600px;
  top: 30%;
  right: -100px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.4) 0%, rgba(6, 182, 212, 0) 70%);
  animation: driftBlob2 26s ease-in-out infinite alternate;
}

.blob-3 {
  width: 560px;
  height: 560px;
  bottom: -60px;
  left: 20%;
  background: radial-gradient(circle, rgba(217, 70, 239, 0.35) 0%, rgba(217, 70, 239, 0) 70%);
  animation: driftBlob3 24s ease-in-out infinite alternate;
}

@keyframes driftBlob1 {
  0% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(120px, 90px) scale(1.18);
  }
  100% {
    transform: translate(60px, 160px) scale(0.92);
  }
}

@keyframes driftBlob2 {
  0% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(-140px, 110px) scale(1.22);
  }
  100% {
    transform: translate(-80px, -80px) scale(0.95);
  }
}

@keyframes driftBlob3 {
  0% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(100px, -120px) scale(1.15);
  }
  100% {
    transform: translate(-90px, -60px) scale(1.05);
  }
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   Header & Navigation (backdrop-filter: blur(20px) 玻璃拟态)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.65);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 4px 30px rgba(99, 102, 241, 0.06);
  padding: 16px 0;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-heading);
}

.brand-badge {
  font-size: 0.72rem;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.1);
  color: var(--color-primary);
  border: 1px solid rgba(99, 102, 241, 0.25);
  font-weight: 700;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 600;
  transition: var(--transition);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
}

.nav-link:hover {
  color: var(--color-primary);
  background: rgba(99, 102, 241, 0.08);
}

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

/* ==========================================================================
   CTA 按钮：靛蓝到青色渐变，圆角 14px，带玻璃投影与内部镜面高光
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-cta);
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
  white-space: nowrap;
  border: 1px solid rgba(255, 255, 255, 0.4);
  min-height: 48px;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient-brand);
  color: #ffffff;
  box-shadow: var(--shadow-cta);
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 50%;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.25) 0%, transparent 100%);
  border-radius: var(--radius-cta) var(--radius-cta) 0 0;
  pointer-events: none;
}

.btn-primary:hover {
  background: var(--gradient-brand-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-cta-hover);
  color: #ffffff;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--text-heading);
  border: 1px solid var(--glass-border);
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.08);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.95);
  border-color: rgba(99, 102, 241, 0.35);
  color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.15);
}

.btn-sm {
  padding: 8px 20px;
  font-size: 0.88rem;
  min-height: 40px;
  border-radius: 12px;
}

.btn-lg {
  padding: 15px 36px;
  font-size: 1.05rem;
  min-height: 54px;
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   Hero Section 视觉区与右侧 3D 玻璃立方体
   ========================================================================== */
.hero-section {
  padding: 80px 0 60px 0;
  position: relative;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  align-items: center;
  gap: 50px;
}

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

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  color: var(--color-primary);
  font-size: 0.88rem;
  font-weight: 700;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.08);
  margin-bottom: 22px;
}

.hero-title {
  font-size: 3.3rem;
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -1.2px;
  margin-bottom: 20px;
  color: var(--text-heading);
}

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

.hero-subtitle {
  font-size: 1.12rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 34px;
  background: rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 16px 20px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.6);
}

.hero-cta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.hero-guarantee {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--text-dim);
  font-size: 0.88rem;
  font-weight: 600;
  flex-wrap: wrap;
}

.guarantee-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.guarantee-item svg {
  color: var(--color-primary);
}

/* ==========================================================================
   【右侧动画】200×200px CSS 3D 玻璃立方体
   6 个半透明玻璃面，不同颜色边框 + backdrop-blur + 渐变填充
   Y+X 轴同时 360° 旋转 16 秒一周期，每面镜面高光扫过 4 秒一周期
   ========================================================================== */
.cube-scene {
  width: 200px;
  height: 200px;
  perspective: 900px;
  margin: 0 auto;
  position: relative;
}

.cube-3d {
  width: 200px;
  height: 200px;
  position: relative;
  transform-style: preserve-3d;
  animation: rotateCube 16s infinite linear;
}

@keyframes rotateCube {
  0% {
    transform: rotateX(0deg) rotateY(0deg);
  }
  100% {
    transform: rotateX(360deg) rotateY(360deg);
  }
}

.cube-face {
  position: absolute;
  width: 200px;
  height: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  border-radius: 18px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: inset 0 0 20px rgba(255, 255, 255, 0.4), 0 0 15px rgba(99, 102, 241, 0.15);
  overflow: hidden;
  user-select: none;
}

/* 镜面高光扫过 4 秒一周期 */
.cube-face::after {
  content: '';
  position: absolute;
  top: -120%;
  left: -120%;
  width: 340%;
  height: 340%;
  background: linear-gradient(
    45deg,
    transparent 40%,
    rgba(255, 255, 255, 0.85) 50%,
    transparent 60%
  );
  transform: rotate(30deg);
  animation: specularSweep 4s infinite cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
}

@keyframes specularSweep {
  0% {
    transform: translate(-50%, -50%) rotate(30deg);
  }
  45%, 100% {
    transform: translate(50%, 50%) rotate(30deg);
  }
}

/* 6 个不同颜色边框与渐变填充的半透明玻璃面 */
/* 1. 前面 (Front - 靛蓝色) */
.cube-face.front {
  transform: rotateY(0deg) translateZ(100px);
  border: 2px solid rgba(99, 102, 241, 0.7);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.3) 0%, rgba(255, 255, 255, 0.4) 100%);
}

/* 2. 后面 (Back - 青色) */
.cube-face.back {
  transform: rotateY(180deg) translateZ(100px);
  border: 2px solid rgba(6, 182, 212, 0.7);
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.3) 0%, rgba(255, 255, 255, 0.4) 100%);
}

/* 3. 右面 (Right - 紫色) */
.cube-face.right {
  transform: rotateY(90deg) translateZ(100px);
  border: 2px solid rgba(139, 92, 246, 0.7);
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.3) 0%, rgba(255, 255, 255, 0.4) 100%);
}

/* 4. 左面 (Left - 天蓝色) */
.cube-face.left {
  transform: rotateY(-90deg) translateZ(100px);
  border: 2px solid rgba(59, 130, 246, 0.7);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.3) 0%, rgba(255, 255, 255, 0.4) 100%);
}

/* 5. 上面 (Top - 粉红/洋红) */
.cube-face.top {
  transform: rotateX(90deg) translateZ(100px);
  border: 2px solid rgba(236, 72, 153, 0.7);
  background: linear-gradient(135deg, rgba(236, 72, 153, 0.28) 0%, rgba(255, 255, 255, 0.4) 100%);
}

/* 6. 下面 (Bottom - 翡翠绿) */
.cube-face.bottom {
  transform: rotateX(-90deg) translateZ(100px);
  border: 2px solid rgba(16, 185, 129, 0.7);
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.28) 0%, rgba(255, 255, 255, 0.4) 100%);
}

.cube-brand-title {
  font-size: 1.7rem;
  font-weight: 900;
  color: var(--text-heading);
  letter-spacing: -0.5px;
  line-height: 1;
}

.cube-tagline {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 6px;
}

/* 玻璃基座光晕 */
.cube-glow {
  position: absolute;
  bottom: -30px;
  left: 50%;
  transform: translateX(-50%);
  width: 170px;
  height: 25px;
  border-radius: 50%;
  background: radial-gradient(ellipse, rgba(99, 102, 241, 0.45) 0%, transparent 70%);
  filter: blur(10px);
  pointer-events: none;
}

/* ==========================================================================
   Stats Ribbon 关键数据横幅（玻璃拟态）
   ========================================================================== */
.stats-ribbon {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 50px;
  padding: 30px;
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-glass);
}

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

.stat-num {
  font-size: 2.3rem;
  font-weight: 900;
  color: var(--text-heading);
  letter-spacing: -0.5px;
}

.stat-label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ==========================================================================
   Section 共享排版
   ========================================================================== */
.section {
  padding: 85px 0;
  position: relative;
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px auto;
}

.section-pill {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.1);
  color: var(--color-primary);
  border: 1px solid rgba(99, 102, 241, 0.25);
  margin-bottom: 14px;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 850;
  line-height: 1.25;
  letter-spacing: -0.6px;
  color: var(--text-heading);
  margin-bottom: 14px;
}

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

/* ==========================================================================
   产品核心优势介绍（3个图文卡片）
   ========================================================================== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.adv-card {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  position: relative;
  transition: var(--transition);
  box-shadow: var(--shadow-glass);
}

.adv-card:hover {
  transform: translateY(-6px);
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  box-shadow: var(--shadow-glass-hover);
}

.adv-icon {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(6, 182, 212, 0.15) 100%);
  border: 1px solid rgba(99, 102, 241, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin-bottom: 24px;
}

.adv-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 12px;
}

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

.adv-list {
  border-top: 1px solid rgba(99, 102, 241, 0.1);
  padding-top: 18px;
}

.adv-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.adv-list li:last-child {
  margin-bottom: 0;
}

.adv-list svg {
  color: var(--color-primary);
  flex-shrink: 0;
}

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

.support-panel {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-glass);
}

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

.support-panel-icon {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-md);
  background: rgba(99, 102, 241, 0.12);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(99, 102, 241, 0.2);
}

.support-panel-icon.cyan {
  background: rgba(6, 182, 212, 0.12);
  color: var(--color-secondary);
  border-color: rgba(6, 182, 212, 0.25);
}

.support-panel-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-heading);
}

.support-panel-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 28px;
  line-height: 1.65;
}

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

.chip-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--glass-border);
  padding: 12px 14px;
  border-radius: var(--radius-md);
  transition: var(--transition);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.04);
}

.chip-item:hover {
  background: rgba(255, 255, 255, 0.95);
  border-color: rgba(99, 102, 241, 0.35);
  transform: translateY(-2px);
  box-shadow: 0 8px 18px rgba(99, 102, 241, 0.1);
}

.chip-logo {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.85rem;
  color: #ffffff;
  flex-shrink: 0;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.chip-meta {
  overflow: hidden;
}

.chip-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-heading);
  line-height: 1.3;
}

.chip-tag {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary);
}

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

.pricing-card {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
  box-shadow: var(--shadow-glass);
}

.pricing-card.featured {
  border: 2px solid var(--color-primary);
  background: rgba(255, 255, 255, 0.85);
  box-shadow: 0 25px 50px -10px rgba(99, 102, 241, 0.22);
  transform: scale(1.03);
}

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

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-6px);
}

.featured-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-brand);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  padding: 4px 18px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  box-shadow: 0 6px 14px rgba(99, 102, 241, 0.35);
}

.plan-name {
  font-size: 1.38rem;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  line-height: 1.5;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(99, 102, 241, 0.12);
  flex-wrap: wrap;
}

.price-currency {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--color-primary);
}

.price-amount {
  font-size: 3.1rem;
  font-weight: 900;
  color: var(--text-heading);
  line-height: 1;
}

.price-period {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-dim);
}

.price-sub {
  font-size: 0.8rem;
  color: var(--color-primary);
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.25);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-left: 6px;
  font-weight: 700;
}

.plan-features {
  flex-grow: 1;
  margin-bottom: 32px;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.plan-features li svg {
  color: var(--color-primary);
  flex-shrink: 0;
}

.pricing-footer-tip {
  text-align: center;
  margin-top: 36px;
  font-size: 0.92rem;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 14px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  display: inline-block;
  margin-left: auto;
  margin-right: auto;
}

/* ==========================================================================
   用户评价
   ========================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-glass);
  transition: var(--transition);
}

.testimonial-card:hover {
  transform: translateY(-4px);
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  box-shadow: var(--shadow-glass-hover);
}

.stars {
  display: flex;
  gap: 4px;
  color: #f59e0b;
  margin-bottom: 16px;
  font-size: 1.05rem;
}

.testimonial-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 24px;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 12px;
}

.avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--gradient-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  color: #ffffff;
  box-shadow: 0 4px 10px rgba(99, 102, 241, 0.3);
}

.user-name {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--text-heading);
}

.user-role {
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* ==========================================================================
   FAQ Section (纯 CSS 玻璃折叠卡片)
   ========================================================================== */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-glass);
}

.faq-item[open] {
  border-color: rgba(99, 102, 241, 0.35);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 15px 30px -10px rgba(99, 102, 241, 0.15);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-heading);
  cursor: pointer;
  user-select: none;
  list-style: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-icon {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
  transition: transform 0.25s ease;
  flex-shrink: 0;
  margin-left: 12px;
}

.faq-item[open] .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 24px 22px 24px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.75;
}

/* ==========================================================================
   Pre-Footer CTA Banner
   ========================================================================== */
.cta-banner {
  margin: 60px 0 30px 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.85) 0%, rgba(240, 244, 255, 0.7) 100%);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 60px 30px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-glass);
}

.cta-banner-title {
  font-size: 2.35rem;
  font-weight: 850;
  color: var(--text-heading);
  margin-bottom: 14px;
}

.cta-banner-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 30px auto;
}

/* ==========================================================================
   Footer Section (只保留 4 个指定标题)
   ========================================================================== */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.55);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 48px 0 36px 0;
  position: relative;
  z-index: 10;
}

.footer-nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.footer-nav-item a {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-heading);
  transition: var(--transition);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
}

.footer-nav-item a:hover {
  color: var(--color-primary);
  background: rgba(99, 102, 241, 0.08);
}

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

/* ==========================================================================
   独立子页面样式 (about, terms, privacy, sitemap, wiki)
   ========================================================================== */
.page-header {
  padding: 60px 0 40px 0;
  text-align: center;
  border-bottom: 1px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.page-title {
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--text-heading);
  margin-bottom: 12px;
}

.page-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto;
}

.article-content {
  max-width: 860px;
  margin: 50px auto 80px auto;
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-glass);
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-heading);
  margin: 36px 0 16px 0;
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-content h2:first-of-type {
  margin-top: 0;
}

.article-content p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 16px;
}

.article-content ul {
  list-style: disc;
  margin-left: 24px;
  margin-bottom: 20px;
}

.article-content ul li {
  color: var(--text-muted);
  margin-bottom: 10px;
  line-height: 1.7;
}

.article-alert {
  background: rgba(99, 102, 241, 0.08);
  border-left: 4px solid var(--color-primary);
  padding: 18px 20px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 24px 0;
  color: var(--text-heading);
}

.article-alert.danger {
  background: rgba(239, 68, 68, 0.08);
  border-left-color: #ef4444;
  color: #991b1b;
}

.back-home-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-primary);
  font-weight: 700;
  margin-bottom: 24px;
}

/* ==========================================================================
   Responsive Breakpoints (@media)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-layout {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

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

  .hero-cta,
  .hero-guarantee {
    justify-content: center;
  }

  .advantages-grid,
  .pricing-grid,
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-card.featured {
    transform: none;
  }

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

  .support-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 56px 0;
  }

  .site-header {
    padding: 12px 0;
  }

  .nav-menu {
    display: none;
  }

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

  .hero-title {
    font-size: 2.15rem;
    letter-spacing: -0.5px;
  }

  .hero-subtitle {
    font-size: 1rem;
    padding: 14px;
  }

  .hero-cta {
    flex-direction: column;
    gap: 12px;
  }

  .hero-cta .btn {
    width: 100%;
  }

  .stats-ribbon {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    padding: 20px;
  }

  .stat-num {
    font-size: 1.8rem;
  }

  .advantages-grid,
  .pricing-grid,
  .testimonials-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

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

  .support-panel {
    padding: 24px 18px;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .cta-banner {
    padding: 40px 20px;
  }

  .cta-banner-title {
    font-size: 1.75rem;
  }

  .footer-nav-list {
    flex-direction: column;
    gap: 16px;
  }

  .article-content {
    padding: 24px 18px;
    margin: 30px auto 50px auto;
  }

  .page-title {
    font-size: 1.9rem;
  }

  .btn,
  .faq-question,
  .footer-nav-item a {
    min-height: 48px;
    display: flex;
    align-items: center;
  }
}

/* ==========================================================================
   Article Inline FAQs (默认全部展开，液态玻璃拟态)
   ========================================================================== */
.article-faq-wrap {
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid rgba(99, 102, 241, 0.15);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.article-faq-heading {
  font-size: 1.15rem;
  font-weight: 850;
  color: var(--text-heading);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.article-faq-item {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.05);
}

.article-faq-item[open] {
  border-color: rgba(99, 102, 241, 0.35);
  background: rgba(255, 255, 255, 0.9);
}

.article-faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  font-size: 0.95rem;
  font-weight: 750;
  color: var(--text-heading);
  cursor: pointer;
  user-select: none;
  list-style: none;
}

.article-faq-q::-webkit-details-marker {
  display: none;
}

.article-faq-q svg {
  width: 16px;
  height: 16px;
  color: var(--color-primary);
  flex-shrink: 0;
  margin-left: 10px;
  transition: transform 0.25s ease;
}

.article-faq-item[open] .article-faq-q svg {
  transform: rotate(180deg);
}

.article-faq-a {
  padding: 0 18px 14px 18px;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.article-faq-a a {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: underline;
}

.article-faq-a a:hover {
  color: var(--color-secondary);
}

/* 高对比度链接优化 (WCAG AA >= 4.5:1) */
.article-content a,
.seo-article-body a,
.article-faq-a a {
  color: #4338ca;
}

/* 前庭神经与系统级减弱动态效果支持 (prefers-reduced-motion) */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .cube-3d,
  .cube-face::after,
  .blob-1,
  .blob-2,
  .blob-3 {
    animation: none !important;
  }
}