:root {
  /* 背景与配色方案 */
  --bg-gradient: linear-gradient(135deg, #F0F4FF 0%, #E0E7FF 50%, #F5E8FF 100%);
  --primary: #6366F1;       /* 靛蓝 */
  --secondary: #06B6D4;     /* 青色 */
  --accent-purple: #A855F7; /* 紫色辅助 */
  --glass-white: rgba(255, 255, 255, 0.4);
  --glass-bg: rgba(255, 255, 255, 0.52);
  --glass-bg-hover: rgba(255, 255, 255, 0.75);
  --glass-border: rgba(255, 255, 255, 0.75);
  --glass-border-hover: rgba(99, 102, 241, 0.35);

  /* 文字颜色 (适配高质感明亮背景) */
  --text-primary: #1e1b4b;   /* 深靛蓝主标题与核心文字 */
  --text-secondary: #475569; /* 正文次要说明 */
  --text-muted: #64748b;     /* 辅助标注 */
  --text-light: #ffffff;

  /* 渐变与阴影 */
  --gradient-cta: linear-gradient(135deg, #6366F1 0%, #06B6D4 100%);
  --gradient-cta-hover: linear-gradient(135deg, #4f46e5 0%, #0891b2 100%);
  --shadow-glass: 0 10px 30px -5px rgba(99, 102, 241, 0.08), 0 4px 12px -2px rgba(6, 182, 212, 0.05);
  --shadow-glass-hover: 0 20px 40px -10px rgba(99, 102, 241, 0.18), 0 8px 16px -4px rgba(6, 182, 212, 0.1);
  --shadow-btn: 0 10px 25px -4px rgba(99, 102, 241, 0.38), 0 4px 10px -2px rgba(6, 182, 212, 0.25);

  /* 字体规范 (纯本地与系统优质字体栈，零外部网络请求) */
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;

  /* 圆角规范 */
  --radius-btn: 14px;
  --radius-card: 20px;
  --radius-sm: 10px;
  --radius-full: 9999px;

  --max-width: 1200px;
  --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  color: var(--text-primary);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 无障碍键盘焦点轮廓样式 */
:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 3px;
  border-radius: 4px;
}

/* 固定页眉防遮挡锚点距离 */
section, [id] {
  scroll-margin-top: 86px;
}

/* 文本防溢出保护 */
.hero-title, .section-title, .feature-title, .article-content, p, h1, h2, h3 {
  overflow-wrap: break-word;
  word-break: break-word;
}

/* 无障碍跳转到主要内容入口 */
.skip-link {
  position: absolute;
  top: -120px;
  left: 20px;
  background: var(--primary);
  color: #ffffff !important;
  padding: 12px 22px;
  border-radius: var(--radius-btn);
  font-weight: 700;
  font-size: 0.95rem;
  z-index: 10000;
  transition: top 0.25s ease;
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.45);
  text-decoration: none;
}
.skip-link:focus,
.skip-link:focus-visible {
  top: 20px;
  outline: 3px solid #ffffff;
}

/* 动画自适应 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;
  }
  .blob, .axis-system, .cube, .pulse-node {
    animation: none !important;
  }
}

body {
  line-height: 1.65;
  background: var(--bg-gradient);
  background-attachment: fixed;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow-x: hidden;
}

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

ul, ol {
  list-style: none;
}

img, svg {
  display: block;
}

/* ==========================================================================
   背景动效：3-4个大型 blur(80px) 的彩色 blob (透明度 0.5 缓慢漂移缩放)
   ========================================================================== */
.bg-blobs {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  z-index: -1;
  pointer-events: none;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  -webkit-filter: blur(80px);
  opacity: 0.5;
  animation: floatDrift 20s infinite alternate ease-in-out;
}

.blob-1 {
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, #6366F1 0%, rgba(99, 102, 241, 0.4) 70%);
  top: -150px;
  left: -120px;
  animation-duration: 18s;
}

.blob-2 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, #06B6D4 0%, rgba(6, 182, 212, 0.35) 70%);
  top: 15%;
  right: -150px;
  animation-duration: 22s;
  animation-delay: -5s;
}

.blob-3 {
  width: 580px;
  height: 580px;
  background: radial-gradient(circle, #A855F7 0%, rgba(168, 85, 247, 0.35) 70%);
  bottom: 12%;
  left: 10%;
  animation-duration: 25s;
  animation-delay: -10s;
}

.blob-4 {
  width: 440px;
  height: 440px;
  background: radial-gradient(circle, #38BDF8 0%, rgba(56, 189, 248, 0.3) 70%);
  bottom: -100px;
  right: 5%;
  animation-duration: 20s;
  animation-delay: -14s;
}

@keyframes floatDrift {
  0% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(45px, 60px) scale(1.12);
  }
  100% {
    transform: translate(-35px, 30px) scale(0.92);
  }
}

/* Layout Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
  position: relative;
}

.section-title-wrap {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px auto;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.25);
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 16px;
  backdrop-filter: blur(8px);
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.45rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-title .gradient-text {
  background: linear-gradient(135deg, #6366F1 0%, #06B6D4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-desc {
  font-size: 1.12rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ==========================================================================
   页眉导航 (backdrop-filter: blur(20px) 玻璃拟态)
   ========================================================================== */
.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 20px rgba(99, 102, 241, 0.04);
  padding: 16px 0;
  transition: var(--transition);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-heading);
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.brand-logo svg {
  width: 34px;
  height: 34px;
  color: var(--primary);
  filter: drop-shadow(0 2px 8px rgba(99, 102, 241, 0.35));
}

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

.nav-link {
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: var(--transition);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
}

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

.nav-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding: 10px 24px;
  border-radius: var(--radius-btn);
  background: var(--gradient-cta);
  color: #ffffff;
  font-size: 0.92rem;
  font-weight: 700;
  box-shadow: var(--shadow-btn);
  transition: var(--transition);
  border: 1px solid rgba(255, 255, 255, 0.35);
}

.nav-cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 28px -4px rgba(99, 102, 241, 0.5), 0 6px 14px -2px rgba(6, 182, 212, 0.35);
  background: var(--gradient-cta-hover);
}

/* ==========================================================================
   CTA 按钮 (圆角 14px, 玻璃投影, hover 时上移 2px)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  gap: 10px;
  padding: 14px 34px;
  border-radius: var(--radius-btn);
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient-cta);
  color: #ffffff;
  box-shadow: var(--shadow-btn);
  border: 1px solid rgba(255, 255, 255, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 32px -4px rgba(99, 102, 241, 0.5), 0 8px 16px -2px rgba(6, 182, 212, 0.35);
  background: var(--gradient-cta-hover);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.7);
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-glass);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.95);
  border-color: rgba(99, 102, 241, 0.4);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glass-hover);
}

/* ==========================================================================
   Hero 主视觉区 (左侧大标题 Outfit 800 + 右侧 280x280 CSS 3D 动画系统)
   ========================================================================== */
.hero-section {
  padding: 80px 0 70px 0;
  position: relative;
  overflow: visible;
}

.hero-flex-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 48px;
}

.hero-left-content {
  flex: 1;
  max-width: 680px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 20px;
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  color: var(--primary);
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 24px;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.08);
  backdrop-filter: blur(10px);
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 3.4rem;
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 22px;
}

.hero-title .brand-highlight {
  background: linear-gradient(135deg, #6366F1 0%, #06B6D4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-title .sub-heading-text {
  display: block;
  font-size: 2.2rem;
  font-weight: 700;
  color: #312e81;
  margin-top: 6px;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 36px;
  background: rgba(255, 255, 255, 0.45);
  padding: 18px 22px;
  border-radius: var(--radius-card);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(12px);
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-tags {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  padding-top: 24px;
  border-top: 1px solid rgba(99, 102, 241, 0.15);
}

.hero-tag-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  font-size: 0.94rem;
  font-weight: 600;
}

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

/* ==========================================================================
   右侧 280×280px CSS 3D 坐标轴系统与玻璃立方体动画
   ========================================================================== */
.hero-right-visual {
  width: 320px;
  height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  flex-shrink: 0;
}

/* 280x280 容器与 3D 透视 */
.tech-3d-scene {
  width: 280px;
  height: 280px;
  position: relative;
  perspective: 900px;
  transform-style: preserve-3d;
}

/* 坐标轴系统：Y+X 轴同时旋转 (18 秒一周期) */
.axis-system {
  width: 280px;
  height: 280px;
  position: absolute;
  top: 0;
  left: 0;
  transform-style: preserve-3d;
  animation: rotateAxisSystem 18s linear infinite;
}

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

/* X/Y/Z 三条带辉光的彩色光线 */
.axis-line {
  position: absolute;
  top: 50%;
  left: 50%;
  transform-style: preserve-3d;
}

/* X 轴 (青色发光线) */
.axis-x {
  width: 280px;
  height: 2px;
  margin: -1px 0 0 -140px;
  background: linear-gradient(90deg, #06B6D4 0%, rgba(255, 255, 255, 0.9) 50%, #06B6D4 100%);
  box-shadow: 0 0 10px #06B6D4, 0 0 20px rgba(6, 182, 212, 0.6);
}

/* Y 轴 (靛蓝发光线) */
.axis-y {
  width: 2px;
  height: 280px;
  margin: -140px 0 0 -1px;
  background: linear-gradient(180deg, #6366F1 0%, rgba(255, 255, 255, 0.9) 50%, #6366F1 100%);
  box-shadow: 0 0 10px #6366F1, 0 0 20px rgba(99, 102, 241, 0.6);
}

/* Z 轴 (紫色/粉色发光线，垂直平面) */
.axis-z {
  width: 280px;
  height: 2px;
  margin: -1px 0 0 -140px;
  background: linear-gradient(90deg, #A855F7 0%, rgba(255, 255, 255, 0.9) 50%, #A855F7 100%);
  box-shadow: 0 0 10px #A855F7, 0 0 20px rgba(168, 85, 247, 0.6);
  transform: rotateY(90deg);
}

/* 6个发光数据节点位于轴的 ±端点 (按节奏脉冲缩放) */
.data-node {
  position: absolute;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  top: 50%;
  left: 50%;
  margin: -6px 0 0 -6px;
  background: #ffffff;
  border: 2px solid #06B6D4;
  box-shadow: 0 0 12px #06B6D4, 0 0 24px rgba(6, 182, 212, 0.8);
  animation: pulseNode 3s infinite ease-in-out;
}

.node-x-neg { transform: translateX(-140px); }
.node-x-pos { transform: translateX(140px); }
.node-y-neg { transform: translateY(-140px); border-color: #6366F1; box-shadow: 0 0 12px #6366F1, 0 0 24px rgba(99, 102, 241, 0.8); animation-delay: -0.5s; }
.node-y-pos { transform: translateY(140px); border-color: #6366F1; box-shadow: 0 0 12px #6366F1, 0 0 24px rgba(99, 102, 241, 0.8); animation-delay: -0.5s; }
.node-z-neg { transform: rotateY(90deg) translateX(-140px); border-color: #A855F7; box-shadow: 0 0 12px #A855F7, 0 0 24px rgba(168, 85, 247, 0.8); animation-delay: -1s; }
.node-z-pos { transform: rotateY(90deg) translateX(140px); border-color: #A855F7; box-shadow: 0 0 12px #A855F7, 0 0 24px rgba(168, 85, 247, 0.8); animation-delay: -1s; }

@keyframes pulseNode {
  0%, 100% {
    transform: scale(0.85);
    opacity: 0.8;
  }
  50% {
    transform: scale(1.4);
    opacity: 1;
    box-shadow: 0 0 16px #06B6D4, 0 0 30px #6366F1;
  }
}

/* ==========================================================================
   140×140px 玻璃 3D 立方体 (自身在 X+Y 轴同时旋转 12 秒一周期)
   ========================================================================== */
.glass-cube-wrapper {
  width: 140px;
  height: 140px;
  position: absolute;
  top: 50%;
  left: 50%;
  margin: -70px 0 0 -70px;
  transform-style: preserve-3d;
  animation: rotateGlassCube 12s linear infinite;
  pointer-events: none;
}

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

/* 6 个半透明玻璃面 + 1.5px 靛蓝描边 + backdrop-blur */
.cube-face {
  position: absolute;
  width: 140px;
  height: 140px;
  background: rgba(255, 255, 255, 0.35);
  border: 1.5px solid rgba(99, 102, 241, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: inset 0 0 18px rgba(255, 255, 255, 0.5), 0 0 14px rgba(99, 102, 241, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
}

.face-front  { transform: translateZ(70px); }
.face-back   { transform: rotateY(180deg) translateZ(70px); }
.face-right  { transform: rotateY(90deg) translateZ(70px); }
.face-left   { transform: rotateY(-90deg) translateZ(70px); }
.face-top    { transform: rotateX(90deg) translateZ(70px); }
.face-bottom { transform: rotateX(-90deg) translateZ(70px); }

/* 最中心叠「耶」字 (靛蓝到青色渐变填充) */
.cube-center-char {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) translateZ(0);
  font-family: var(--font-heading);
  font-size: 56px;
  font-weight: 900;
  background: linear-gradient(135deg, #6366F1 0%, #06B6D4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 10px rgba(99, 102, 241, 0.5));
  z-index: 10;
  user-select: none;
}

/* ==========================================================================
   卡片通用玻璃拟态 (backdrop-filter: blur(20px))
   ========================================================================== */
.feature-card,
.showcase-card,
.pricing-card,
.review-card,
.faq-item,
.cta-banner,
.article-content,
.sitemap-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-glass);
  transition: var(--transition);
}

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

.feature-card {
  border-radius: var(--radius-card);
  padding: 40px 32px;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, #6366F1, #06B6D4);
  opacity: 0;
  transition: var(--transition);
}

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

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

.feature-icon-wrapper {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-btn);
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 24px;
}

.feature-title {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-primary);
}

.feature-desc {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.7;
  margin-bottom: 20px;
}

.feature-meta {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary);
}

/* 流媒体与 AI 支持图卡 */
.media-ai-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.showcase-card {
  border-radius: var(--radius-card);
  padding: 40px;
}

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

.showcase-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.showcase-header-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-btn);
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}

.showcase-header-icon.ai {
  background: rgba(6, 182, 212, 0.12);
  border-color: rgba(6, 182, 212, 0.25);
  color: var(--secondary);
}

.showcase-title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.showcase-subtitle {
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.showcase-desc {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.7;
  margin-bottom: 28px;
}

.pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.pill-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: var(--transition);
}

.pill-item:hover {
  background: rgba(99, 102, 241, 0.1);
  border-color: rgba(99, 102, 241, 0.35);
  color: var(--primary);
}

.pill-status {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10B981;
  box-shadow: 0 0 8px #10B981;
}

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

.pricing-card {
  border-radius: var(--radius-card);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
}

.pricing-card.featured {
  background: rgba(255, 255, 255, 0.75);
  border: 2px solid rgba(99, 102, 241, 0.5);
  box-shadow: 0 16px 36px -8px rgba(99, 102, 241, 0.22);
  transform: scale(1.03);
}

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

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

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-cta);
  color: #ffffff;
  padding: 5px 18px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  box-shadow: var(--shadow-btn);
  white-space: nowrap;
}

.pricing-plan-name {
  font-family: var(--font-heading);
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 8px;
}

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

.pricing-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 28px;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(99, 102, 241, 0.12);
}

.pricing-currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary);
}

.pricing-amount {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1;
}

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

.pricing-features-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.pricing-feature-item svg {
  width: 18px;
  height: 18px;
  color: #10B981;
  flex-shrink: 0;
}

.pricing-card .btn {
  width: 100%;
}

/* ==========================================================================
   用户评价 (Testimonials)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.review-card {
  border-radius: var(--radius-card);
  padding: 32px;
  display: flex;
  flex-direction: column;
}

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

.review-rating {
  display: flex;
  gap: 4px;
  color: #F59E0B;
  margin-bottom: 16px;
}

.review-rating svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.review-text {
  font-size: 0.98rem;
  color: var(--text-primary);
  line-height: 1.7;
  margin-bottom: 24px;
  font-style: italic;
  flex-grow: 1;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-top: 16px;
  border-top: 1px solid rgba(99, 102, 241, 0.1);
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-cta);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 800;
  color: #ffffff;
}

.author-info h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.author-info p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ==========================================================================
   FAQ 常见问题解答
   ========================================================================== */
.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  border-radius: var(--radius-btn);
  overflow: hidden;
}

.faq-item:hover {
  border-color: rgba(99, 102, 241, 0.35);
}

.faq-item[open] {
  border-color: var(--primary);
  background: rgba(255, 255, 255, 0.75);
}

.faq-question {
  padding: 22px 28px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  list-style: none;
}

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

.faq-icon {
  width: 20px;
  height: 20px;
  color: var(--primary);
  transition: transform 0.25s ease;
  flex-shrink: 0;
  margin-left: 16px;
}

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

.faq-answer {
  padding: 0 28px 24px 28px;
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.75;
  border-top: 1px solid rgba(99, 102, 241, 0.08);
  padding-top: 16px;
}

/* ==========================================================================
   CTA 底部呼吁转化横幅
   ========================================================================== */
.cta-banner {
  margin: 50px auto 0 auto;
  border-radius: var(--radius-card);
  padding: 60px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid var(--glass-border);
}

.cta-banner::before {
  content: "";
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 300px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.cta-banner-title {
  font-family: var(--font-heading);
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.cta-banner-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 32px auto;
}

/* ==========================================================================
   页脚 (严格保留4个标题，在新页面打开)
   ========================================================================== */
.footer {
  margin-top: auto;
  background: rgba(255, 255, 255, 0.65);
  border-top: 1px solid var(--glass-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 48px 0 36px 0;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 40px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  color: var(--text-secondary);
  font-size: 1rem;
  font-weight: 600;
  transition: var(--transition);
  padding: 8px 18px;
  border-radius: var(--radius-btn);
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid var(--glass-border);
}

.footer-link:hover {
  color: var(--primary);
  background: rgba(255, 255, 255, 0.9);
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateY(-2px);
}

.footer-bottom {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.88rem;
  padding-top: 24px;
  border-top: 1px solid rgba(99, 102, 241, 0.08);
}

/* ==========================================================================
   子页面内容排版 (about, terms, privacy, sitemap, wiki)
   ========================================================================== */
.page-header {
  padding: 60px 0 40px 0;
  text-align: center;
  margin-bottom: 30px;
}

.page-title {
  font-family: var(--font-heading);
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.page-subtitle {
  color: var(--text-secondary);
  font-size: 1.15rem;
}

.article-content {
  max-width: 880px;
  margin: 0 auto 80px auto;
  border-radius: var(--radius-card);
  padding: 48px;
}

.article-content h2 {
  font-family: var(--font-heading);
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 36px 0 16px 0;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(99, 102, 241, 0.12);
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-content h2 svg {
  color: var(--primary);
}

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

.article-content p {
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 1.02rem;
  margin-bottom: 16px;
}

.article-content ul, .article-content ol {
  margin: 12px 0 20px 24px;
}

.article-content li {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 8px;
  list-style-type: disc;
}

.article-content .highlight-box {
  background: rgba(99, 102, 241, 0.08);
  border-left: 4px solid var(--primary);
  padding: 18px 24px;
  border-radius: 0 var(--radius-btn) var(--radius-btn) 0;
  margin: 24px 0;
  color: var(--text-primary);
}

.article-content .danger-box {
  background: rgba(239, 68, 68, 0.08);
  border-left: 4px solid #EF4444;
  padding: 18px 24px;
  border-radius: 0 var(--radius-btn) var(--radius-btn) 0;
  margin: 24px 0;
  color: #991B1B;
}

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 24px;
}

.sitemap-card {
  border-radius: var(--radius-btn);
  padding: 24px;
}

.sitemap-card h3 {
  font-family: var(--font-heading);
  color: var(--primary);
  font-size: 1.25rem;
  margin-bottom: 14px;
}

.sitemap-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sitemap-link-item {
  color: var(--text-secondary);
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
}

.sitemap-link-item:hover {
  color: var(--primary);
  padding-left: 4px;
}

/* ==========================================================================
   响应式媒体查询 (@media)
   ========================================================================== */
@media screen and (max-width: 1024px) {
  .hero-flex-wrapper {
    flex-direction: column-reverse;
    text-align: center;
    gap: 40px;
  }

  .hero-left-content {
    max-width: 100%;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-tags {
    justify-content: center;
  }

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

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

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

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

  .hero-title {
    font-size: 2.85rem;
  }
}

@media screen and (max-width: 768px) {
  .section {
    padding: 60px 0;
  }

  .container {
    padding: 0 18px;
  }

  .header {
    padding: 12px 0;
  }

  .nav-menu {
    display: none;
  }

  .hero-section {
    padding: 40px 0;
  }

  .hero-title {
    font-size: 2.3rem;
  }

  .hero-title .sub-heading-text {
    font-size: 1.5rem;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
    gap: 14px;
  }

  .hero-actions .btn {
    width: 100%;
    padding: 16px 24px;
  }

  .hero-tags {
    flex-direction: column;
    gap: 12px;
    align-items: center;
  }

  .hero-right-visual {
    width: 280px;
    height: 280px;
  }

  .features-grid,
  .pricing-grid,
  .reviews-grid,
  .sitemap-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

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

  .section-title-wrap {
    margin-bottom: 36px;
  }

  .feature-card,
  .showcase-card,
  .pricing-card,
  .review-card,
  .article-content {
    padding: 24px 20px;
  }

  .faq-question {
    padding: 18px 20px;
    font-size: 1rem;
  }

  .faq-answer {
    padding: 0 20px 20px 20px;
  }

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

  .cta-banner-title {
    font-size: 1.7rem;
  }

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

  .footer-link {
    width: 100%;
    text-align: center;
  }
}