/* ==========================================================================
   蓝帆云 (LanFan Cloud) - 官方先锋几何多边形帆翼 UI 设计系统
   风格定位：Avant-garde geometric poly-sail UI · Algorithmic Brutalism
   色彩基准：深邃建筑靛蓝 (#0b1021) · 晶莹微晶切割面板 · 璀璨帆蓝 (#2a75ff) · 外科钛白
   交互特征：3D 动态低模折纸光影 · 动力折叠 (Kinetic Fold) 徽标 · 几何切角与光剪线
   ========================================================================== */

/* -----------------------------
   1. 设计系统变量 (CSS Tokens)
   ----------------------------- */
:root {
  /* 品牌核心色彩 - 璀璨帆蓝与先锋极客调 */
  --primary: #2a75ff;
  --primary-hover: #175ce0;
  --primary-glow: rgba(42, 117, 255, 0.35);
  --primary-light: #edf4ff;
  --accent-cyan: #00d2ff;
  --accent-purple: #8b5cf6;
  --accent-green: #10b981;
  --accent-amber: #f59e0b;
  --titanium-white: #ffffff;

  /* 几何流线渐变 */
  --gradient-sail: linear-gradient(135deg, #2a75ff 0%, #00d2ff 100%);
  --gradient-facet: linear-gradient(145deg, rgba(255, 255, 255, 0.9) 0%, rgba(240, 245, 255, 0.6) 100%);
  --gradient-specular: linear-gradient(115deg, transparent 35%, rgba(255, 255, 255, 0.8) 50%, transparent 65%);

  /* 默认：白天模式 (高精度白银钛晶明亮界面) */
  --bg-body: #f4f7fc;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --bg-elevated: #ffffff;
  --bg-facet-solid: #ffffff;
  --bg-tag: #e8eef8;
  --border-color: #d6e2f5;
  --border-bright: #2a75ff;
  --border-facet: rgba(42, 117, 255, 0.2);
  --text-main: #0b1021;
  --text-secondary: #3e4d6c;
  --text-muted: #6b7c9e;
  --header-bg: rgba(244, 247, 252, 0.85);
  --glass-bg: rgba(255, 255, 255, 0.75);
  --glass-border: rgba(214, 226, 245, 0.9);
  --shadow-facet: 0 4px 20px -2px rgba(11, 16, 33, 0.06), 0 2px 6px -1px rgba(42, 117, 255, 0.04);
  --shadow-hover: 0 16px 36px -6px rgba(42, 117, 255, 0.18), 0 4px 12px rgba(11, 16, 33, 0.05);
  --shadow-glow: 0 0 35px rgba(42, 117, 255, 0.22);

  /* 几何折纸切角与过渡 */
  --clip-chamfer: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
  --clip-chamfer-sm: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  --transition-normal: 0.35s cubic-bezier(0.2, 0.8, 0.2, 1);
  --transition-kinetic: 0.45s cubic-bezier(0.16, 1, 0.3, 1);
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --container-max: 1240px;
}

/* 核心黑夜模式 (深邃建筑靛蓝 #0b1021 + 晶莹切面) */
[data-theme="dark"] {
  --bg-body: #0b1021;
  --bg-card: rgba(15, 23, 46, 0.78);
  --bg-card-hover: rgba(21, 31, 60, 0.92);
  --bg-elevated: #111a33;
  --bg-facet-solid: #101932;
  --bg-tag: #172344;
  --border-color: rgba(42, 117, 255, 0.2);
  --border-bright: #4b8eff;
  --border-facet: rgba(42, 117, 255, 0.35);
  --text-main: #f8fafc;
  --text-secondary: #9cb0d1;
  --text-muted: #64789b;
  --header-bg: rgba(11, 16, 33, 0.85);
  --glass-bg: rgba(17, 26, 51, 0.72);
  --glass-border: rgba(42, 117, 255, 0.25);
  --shadow-facet: 0 4px 24px -2px rgba(0, 0, 0, 0.5), 0 0 16px rgba(42, 117, 255, 0.08);
  --shadow-hover: 0 18px 44px -4px rgba(0, 0, 0, 0.7), 0 0 30px rgba(42, 117, 255, 0.3);
  --shadow-glow: 0 0 45px rgba(42, 117, 255, 0.35);
  --gradient-facet: linear-gradient(145deg, rgba(23, 34, 66, 0.9) 0%, rgba(13, 20, 42, 0.7) 100%);
}

/* -----------------------------
   2. 基础重置与先锋网格底纹
   ----------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 86px;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.65;
  transition: background-color 0.4s ease, color 0.4s ease, border-color 0.4s ease;
  overflow-x: hidden;
  background-image:
    radial-gradient(circle at 50% 15%, rgba(42, 117, 255, 0.12) 0%, transparent 60%),
    linear-gradient(rgba(42, 117, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 117, 255, 0.03) 1px, transparent 1px);
  background-size: 100% 100%, 36px 36px, 36px 36px;
  background-position: 0 0, -1px -1px, -1px -1px;
  -webkit-font-smoothing: antialiased;
}

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

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

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

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* -----------------------------
   3. 顶部页眉与几何全板块导航
   ----------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--header-bg);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.35s ease, border-color 0.35s ease;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.35rem;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.logo-img {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: block;
  object-fit: cover;
  box-shadow: 0 4px 14px rgba(42, 117, 255, 0.35);
  transition: transform var(--transition-kinetic);
  flex-shrink: 0;
}

.logo:hover .logo-img {
  transform: rotate(-10deg) scale(1.08);
}

.logo-text-gradient {
  background: var(--gradient-sail);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 900;
}

/* 导航链接目录 (包含首页、所有版块锚点及推荐资讯) */
.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  padding: 8px 4px;
  transition: color var(--transition-normal);
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--primary);
  box-shadow: 0 0 8px var(--primary);
  transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1), left 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

/* 精致透明化昼夜模式切换按钮 */
.theme-toggle-btn {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border-facet);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  box-shadow: var(--shadow-facet);
  transition: all var(--transition-kinetic);
  position: relative;
  overflow: hidden;
}

.theme-toggle-btn:hover {
  color: var(--primary);
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(42, 117, 255, 0.25);
}

.theme-toggle-btn .icon-sun,
.theme-toggle-btn .icon-moon {
  width: 20px;
  height: 20px;
  position: absolute;
  transition: transform 0.45s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.35s ease;
}

/* 默认白天：显示月亮提示切换到夜间 */
.theme-toggle-btn .icon-sun {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}
.theme-toggle-btn .icon-moon {
  opacity: 1;
  transform: rotate(0) scale(1);
}

/* 暗夜模式：显示太阳提示切换回白天 */
[data-theme="dark"] .theme-toggle-btn .icon-sun {
  opacity: 1;
  transform: rotate(0) scale(1);
  color: #fbbf24;
}
[data-theme="dark"] .theme-toggle-btn .icon-moon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}

.mobile-menu-btn {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 8px;
  background: var(--glass-bg);
  border: 1px solid var(--border-color);
  align-items: center;
  justify-content: center;
  color: var(--text-main);
}

/* -----------------------------
   4. 先锋几何按钮 (Facet CTA Buttons)
   ----------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  min-height: 48px;
  font-size: 0.96rem;
  font-weight: 700;
  letter-spacing: 0.3px;
  border-radius: 8px;
  clip-path: var(--clip-chamfer-sm);
  transition: all var(--transition-kinetic);
  text-align: center;
  white-space: nowrap;
  user-select: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient-sail);
  color: #ffffff;
  box-shadow: 0 4px 18px rgba(42, 117, 255, 0.4);
  border: none;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(42, 117, 255, 0.55);
  color: #ffffff;
}

/* 按钮微晶光剪线动效 */
.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -120%;
  width: 80%;
  height: 100%;
  background: var(--gradient-specular);
  transform: skewX(-25deg);
  transition: left 0.65s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-primary:hover::before {
  left: 140%;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-facet);
}

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

.btn-lg {
  padding: 16px 36px;
  font-size: 1.05rem;
}

.btn-block {
  width: 100%;
}

/* -----------------------------
   5. 主视觉区 (Hero: 标题+简介+3D折纸帆翼)
   ----------------------------- */
.hero-section {
  padding: 70px 0 60px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
}

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

.hero-facet-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--bg-tag);
  border: 1px solid var(--border-facet);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 1px;
  margin-bottom: 20px;
  clip-path: var(--clip-chamfer-sm);
}

.tag-pulsar {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 10px var(--primary);
  animation: pulse-ring 2s infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.9); opacity: 0.9; }
  50% { transform: scale(1.3); opacity: 0.4; }
  100% { transform: scale(0.9); opacity: 0.9; }
}

/* 大标题严格包含品牌名“蓝帆云” */
.hero-title {
  font-size: 3.3rem;
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -1.2px;
  margin-bottom: 22px;
  color: var(--text-main);
}

.hero-subtitle {
  font-size: 1.16rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 34px;
  max-width: 620px;
}

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

.hero-spec-pills {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.spec-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 4px;
}

.spec-pill strong {
  color: var(--text-main);
}

/* 3D 参数化低模折纸帆翼视效容器 (Parametric 3D Low-Poly Sail Container) */
.hero-visual-container {
  position: relative;
  background: var(--gradient-facet);
  border: 1px solid var(--border-facet);
  border-radius: 18px;
  clip-path: var(--clip-chamfer);
  box-shadow: var(--shadow-facet), var(--shadow-glow);
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  min-height: 480px;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.4s ease;
  transform-style: preserve-3d;
  perspective: 1000px;
}

.poly-sail-wrapper {
  position: relative;
  width: 100%;
  height: 340px;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
  border: 1px solid var(--border-facet);
  background: var(--bg-body);
}

.poly-sail-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1), filter 0.4s ease;
}

.hero-visual-container:hover .poly-sail-img {
  transform: scale(1.04);
}

/* 白天模式与暗夜模式精细画作动态切换 */
.sail-light {
  display: block;
}
.sail-dark {
  display: none;
}

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

.poly-sail-badge {
  position: absolute;
  top: 14px;
  left: 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--primary);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 5px 12px;
  border-radius: 4px;
  border: 1px solid var(--border-facet);
  letter-spacing: 0.6px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.poly-telemetry {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 16px;
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}

.telemetry-item {
  background: var(--bg-tag);
  padding: 10px 12px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  text-align: left;
}

.telemetry-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.telemetry-val {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--primary);
  margin-top: 2px;
}

/* -----------------------------
   6. 通用分段标题系统
   ----------------------------- */
.section {
  padding: 96px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 60px;
}

.section-facet-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 12px;
  padding: 4px 12px;
  background: var(--bg-tag);
  border: 1px solid var(--border-facet);
  border-radius: 4px;
}

.section-title {
  font-size: 2.45rem;
  font-weight: 900;
  letter-spacing: -0.8px;
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.08rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* -----------------------------
   7. 核心优势：3个先锋晶面卡片
   ----------------------------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.facet-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  clip-path: var(--clip-chamfer);
  padding: 38px 30px;
  box-shadow: var(--shadow-facet);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: all var(--transition-kinetic);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.facet-card:hover {
  transform: translateY(-8px) scale(1.01);
  border-color: var(--primary);
  box-shadow: var(--shadow-hover);
}

/* 晶面光剪切效果 (Specular Line-Shear) */
.facet-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -150%;
  width: 100%;
  height: 100%;
  background: var(--gradient-specular);
  transform: skewX(-20deg);
  transition: left 0.75s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: none;
}

.facet-card:hover::before {
  left: 150%;
}

.facet-card-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 16px;
  display: block;
}

.facet-icon-box {
  width: 58px;
  height: 58px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  background: var(--bg-tag);
  border: 1px solid var(--border-facet);
  color: var(--primary);
}

.facet-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: var(--text-main);
}

.facet-desc {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 24px;
  flex-grow: 1;
}

.facet-checklist {
  border-top: 1px solid var(--border-color);
  padding-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.facet-check-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.facet-check-icon {
  color: var(--accent-green);
  flex-shrink: 0;
}

/* -----------------------------
   8. 流媒体解锁 & AI 生产力图卡
   ----------------------------- */
.showcase-facet-banner {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  clip-path: var(--clip-chamfer);
  padding: 46px;
  box-shadow: var(--shadow-facet);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  margin-bottom: 40px;
  position: relative;
}

.showcase-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 34px;
  flex-wrap: wrap;
  gap: 16px;
}

.showcase-header h2,
.showcase-header h3 {
  font-size: 1.65rem;
  font-weight: 900;
  margin-top: 8px;
  margin-bottom: 6px;
}

.showcase-header p {
  color: var(--text-secondary);
  font-size: 1rem;
}

.showcase-visual-wrap {
  width: 100%;
  height: 240px;
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 28px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-facet);
  position: relative;
}

.showcase-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.showcase-facet-banner:hover .showcase-img {
  transform: scale(1.04);
}

.showcase-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.service-facet-item {
  background: var(--bg-body);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  transition: all var(--transition-kinetic);
}

.service-facet-item:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-facet);
}

.service-logo {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.15rem;
  flex-shrink: 0;
}

.service-meta h3,
.service-meta h4 {
  font-size: 0.98rem;
  font-weight: 800;
  margin-bottom: 2px;
}

.service-meta span {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: block;
}

/* 品牌色调 */
.logo-netflix { background: #e50914; color: #fff; }
.logo-disney { background: #113ccf; color: #fff; }
.logo-youtube { background: #ff0000; color: #fff; }
.logo-hbo { background: #5822b4; color: #fff; }
.logo-spotify { background: #1db954; color: #fff; }
.logo-prime { background: #00a8e1; color: #fff; }
.logo-hulu { background: #1ce783; color: #0b1021; }
.logo-dazn { background: #ffffff; color: #000; border: 1px solid #ddd; }

.logo-openai { background: #10a37f; color: #fff; }
.logo-claude { background: #d97706; color: #fff; }
.logo-midjourney { background: #111; color: #fff; }
.logo-gemini { background: #1a73e8; color: #fff; }
.logo-copilot { background: #24292f; color: #fff; }
.logo-perplexity { background: #134e4a; color: #2dd4bf; }
.logo-poe { background: #5b21b6; color: #fff; }
.logo-sora { background: #2a75ff; color: #fff; }

/* -----------------------------
   9. 套餐价格表 (真实市场定价与折叠交互)
   ----------------------------- */
.pricing-switch-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 46px;
}

.billing-toggle-btn {
  padding: 8px 18px;
  border-radius: 20px;
  font-size: 0.92rem;
  font-weight: 700;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  transition: all var(--transition-kinetic);
}

.billing-toggle-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  box-shadow: 0 4px 14px var(--primary-glow);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  perspective: 1200px;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 18px;
  clip-path: var(--clip-chamfer);
  padding: 42px 32px;
  box-shadow: var(--shadow-facet);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: all var(--transition-kinetic);
  display: flex;
  flex-direction: column;
  position: relative;
  transform-style: preserve-3d;
}

.pricing-card:hover {
  transform: translateY(-10px) rotateX(1.5deg) scale(1.02);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary);
}

.pricing-card.featured {
  border: 2px solid var(--primary);
  box-shadow: var(--shadow-hover), var(--shadow-glow);
  transform: scale(1.03);
  z-index: 2;
}

.pricing-card.featured:hover {
  transform: scale(1.05) translateY(-8px);
}

.popular-banner {
  position: absolute;
  top: 0;
  right: 0;
  background: var(--gradient-sail);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  padding: 6px 16px;
  border-radius: 0 0 0 10px;
  letter-spacing: 0.5px;
}

.plan-tier-code {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 6px;
}

.plan-title {
  font-size: 1.5rem;
  font-weight: 900;
  margin-bottom: 8px;
}

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

.price-display-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 26px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border-color);
}

.price-currency {
  font-size: 1.4rem;
  font-weight: 800;
}

.price-val {
  font-size: 3.2rem;
  font-weight: 900;
  font-family: var(--font-mono);
  line-height: 1;
}

.price-unit {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.plan-specs {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 34px;
  flex-grow: 1;
}

.spec-line {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.94rem;
  color: var(--text-secondary);
}

.spec-line svg {
  color: var(--accent-green);
  flex-shrink: 0;
}

.spec-line strong {
  color: var(--text-main);
}

/* -----------------------------
   10. 用户评价与常见问题 (Reviews & FAQ)
   ----------------------------- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.review-facet-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  clip-path: var(--clip-chamfer);
  padding: 32px;
  box-shadow: var(--shadow-facet);
  transition: all var(--transition-kinetic);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-facet-card:hover {
  transform: translateY(-6px);
  border-color: var(--primary);
  box-shadow: var(--shadow-hover);
}

.review-stars {
  color: #fbbf24;
  margin-bottom: 16px;
  letter-spacing: 2px;
}

.review-text {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 24px;
}

.author-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-color);
  padding-top: 18px;
}

.author-badge {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--gradient-sail);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-family: var(--font-mono);
}

.author-meta h4,
.author-meta h5 {
  font-size: 0.98rem;
  font-weight: 800;
}

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

/* FAQ 手风琴 */
.faq-box {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  transition: all var(--transition-kinetic);
}

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

.faq-question {
  width: 100%;
  padding: 22px 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  font-size: 1.08rem;
  font-weight: 800;
  color: var(--text-main);
  background: transparent;
  gap: 16px;
}

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

.faq-item.active .faq-arrow {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1), padding 0.3s ease;
  padding: 0 26px;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 0 26px 24px 26px;
}

.faq-answer p {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* -----------------------------
   11. 推荐资讯专区网格 (Insights Grid)
   ----------------------------- */
.insights-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.insight-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  clip-path: var(--clip-chamfer);
  padding: 34px 28px;
  box-shadow: var(--shadow-facet);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-kinetic);
}

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

.insight-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.badge-tag {
  padding: 4px 10px;
  background: rgba(42, 117, 255, 0.12);
  color: var(--primary);
  border-radius: 4px;
  font-weight: 700;
}
.badge-tag.tag-purple { background: rgba(139, 92, 246, 0.12); color: var(--accent-purple); }
.badge-tag.tag-cyan { background: rgba(0, 210, 255, 0.12); color: var(--accent-cyan); }
.badge-tag.tag-green { background: rgba(16, 185, 129, 0.12); color: var(--accent-green); }

.insight-title {
  font-size: 1.3rem;
  font-weight: 800;
  line-height: 1.4;
  margin-bottom: 14px;
  color: var(--text-main);
}

.insight-excerpt {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 24px;
  flex-grow: 1;
}

.insight-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-color);
  padding-top: 18px;
}

.read-time {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.facet-link {
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 4px;
}

.facet-link:hover {
  transform: translateX(4px);
}

/* -----------------------------
   12. 页面底栏 (Footer) - 严格保留四项
   ----------------------------- */
.site-footer {
  border-top: 1px solid var(--border-color);
  background: var(--bg-card);
  padding: 46px 0;
  transition: background-color 0.35s ease, border-color 0.35s ease;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
}

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

.footer-link {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-secondary);
  padding: 6px 4px;
  position: relative;
}

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

.footer-copyright {
  font-size: 0.86rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* -----------------------------
   13. 子页面统一版式 (Subpages)
   ----------------------------- */
.subpage-hero {
  padding: 64px 0 44px;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-card);
}

.subpage-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 14px;
}

.subpage-title {
  font-size: 2.6rem;
  font-weight: 900;
  margin-bottom: 14px;
}

.subpage-desc {
  font-size: 1.08rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto;
}

.subpage-content {
  padding: 64px 0 90px;
}

.content-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 18px;
  clip-path: var(--clip-chamfer);
  padding: 50px;
  box-shadow: var(--shadow-facet);
  max-width: 920px;
  margin: 0 auto;
}

.prose h3 {
  font-size: 1.45rem;
  font-weight: 900;
  margin-top: 38px;
  margin-bottom: 16px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.prose h3:first-child { margin-top: 0; }
.prose p {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 20px;
}
.prose ul { margin-bottom: 24px; padding-left: 20px; list-style: square; }
.prose li { font-size: 1rem; color: var(--text-secondary); line-height: 1.75; margin-bottom: 10px; }

.highlight-box {
  background: var(--bg-body);
  border-left: 4px solid var(--primary);
  padding: 22px 26px;
  border-radius: 0 10px 10px 0;
  margin: 26px 0;
}
.highlight-box.warning { border-left-color: #ef4444; background: rgba(239, 68, 68, 0.06); }
.highlight-box.success { border-left-color: #10b981; background: rgba(16, 185, 129, 0.06); }

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.sitemap-group {
  background: var(--bg-body);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 26px;
}

.sitemap-group h4 {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.sitemap-item-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-radius: 6px;
  color: var(--text-secondary);
  font-size: 0.94rem;
  font-weight: 600;
  transition: all var(--transition-kinetic);
}

.sitemap-item-link:hover {
  background: var(--bg-card);
  color: var(--primary);
  transform: translateX(4px);
}

/* 底部行动横幅 */
.facet-banner {
  background: var(--gradient-sail);
  border-radius: 18px;
  clip-path: var(--clip-chamfer);
  padding: 56px 40px;
  color: #fff;
  text-align: center;
  box-shadow: 0 16px 44px rgba(42, 117, 255, 0.35);
}

.facet-banner h2, .facet-banner h3 {
  font-size: 2.3rem;
  font-weight: 900;
  margin-bottom: 14px;
}

.facet-banner p {
  font-size: 1.12rem;
  opacity: 0.94;
  max-width: 650px;
  margin: 0 auto 32px;
}

.btn-white {
  background: #ffffff;
  color: var(--primary);
  font-weight: 800;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.btn-white:hover {
  background: #f8fafc;
  transform: translateY(-2px);
  color: var(--primary-hover);
}

/* -----------------------------
   14. 深度 SEO 文章与专栏版式 (Article Layout)
   ----------------------------- */
.article-wrap {
  max-width: 920px;
  margin: 0 auto;
}

.article-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

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

.article-header {
  margin-bottom: 36px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 28px;
}

.article-title {
  font-size: 2.35rem;
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 18px;
  letter-spacing: -0.5px;
  color: var(--text-main);
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 18px;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* 晶面多边形文章目录 (Table of Contents) */
.article-toc {
  background: var(--bg-body);
  border: 1px solid var(--border-facet);
  border-left: 4px solid var(--primary);
  border-radius: 8px;
  padding: 24px 28px;
  margin: 32px 0 40px;
}

.article-toc-title {
  font-size: 1.12rem;
  font-weight: 800;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-main);
}

.article-toc-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.article-toc-link {
  font-size: 0.95rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
  transition: color var(--transition-normal);
}

.article-toc-link:hover {
  color: var(--primary);
  transform: translateX(4px);
}

/* 深度正文排版 */
.article-body h2 {
  font-size: 1.65rem;
  font-weight: 900;
  margin-top: 48px;
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-body h3 {
  font-size: 1.3rem;
  font-weight: 800;
  margin-top: 32px;
  margin-bottom: 14px;
  color: var(--text-main);
}

.article-body p {
  font-size: 1.04rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 22px;
}

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

.article-body ul, .article-body ol {
  margin-bottom: 26px;
  padding-left: 24px;
}

.article-body li {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 10px;
}

/* 官方内链高亮卡 */
.internal-link-card {
  background: var(--bg-tag);
  border: 1px solid var(--border-facet);
  border-radius: 12px;
  padding: 20px 24px;
  margin: 32px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.internal-link-text h4 {
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 4px;
}

.internal-link-text p {
  margin-bottom: 0;
  font-size: 0.92rem;
}

/* 文章专属 FAQ 区块 */
.article-faq-section {
  margin-top: 56px;
  padding-top: 36px;
  border-top: 2px solid var(--border-color);
}

.article-faq-title {
  font-size: 1.6rem;
  font-weight: 900;
  margin-bottom: 24px;
}

/* 相关阅读网格 (Related Articles) */
.related-section {
  margin-top: 56px;
  padding-top: 36px;
  border-top: 1px solid var(--border-color);
}

.related-title {
  font-size: 1.4rem;
  font-weight: 900;
  margin-bottom: 22px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.related-card {
  background: var(--bg-body);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 20px;
  transition: all var(--transition-kinetic);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.related-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-facet);
}

.related-card h4 {
  font-size: 1.02rem;
  font-weight: 800;
  margin-bottom: 8px;
  line-height: 1.45;
  color: var(--text-main);
}

.related-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 12px;
}

.related-card span {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary);
}

/* -----------------------------
   15. 响应式布局适配 (@media)
   ----------------------------- */
@media (max-width: 1080px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-text-content {
    text-align: center;
  }
  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-cta-group, .hero-spec-pills {
    justify-content: center;
  }
  .features-grid, .pricing-grid, .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.featured {
    transform: none;
  }
  .showcase-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 76px;
    left: 0;
    width: 100%;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    box-shadow: var(--shadow-hover);
  }
  .nav-links.active {
    display: flex;
  }
  .mobile-menu-btn {
    display: flex;
  }
  .header-actions .btn {
    display: none;
  }

  .hero-title {
    font-size: 2.2rem;
  }
  .hero-subtitle {
    font-size: 1.02rem;
  }
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  .hero-cta-group .btn {
    width: 100%;
  }

  .features-grid, .pricing-grid, .reviews-grid, .showcase-grid, .insights-grid, .sitemap-grid {
    grid-template-columns: 1fr;
  }
  .pricing-grid {
    max-width: 440px;
    margin: 0 auto;
  }

  .showcase-facet-banner, .content-card, .facet-card {
    padding: 28px 20px;
  }
  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }
  .facet-banner {
    padding: 38px 20px;
  }
  .facet-banner h2, .facet-banner h3 {
    font-size: 1.8rem;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.95rem;
  }
  .price-val {
    font-size: 2.6rem;
  }
}