/* ==========================================================================
   悠兔机场 (you-tu.homes) - 零重力全速出海推广落地页样式表
   风格范式：Playful zero-gravity kinetic UI & Soft floating cloud trampoline
   主色调：天幕自上而下自薰衣草云朵蓝 (#3B49DF) 延展至地平线柔杏粉桃 (#FDE2D8)
   物理特性：软质粘弹性布料回弹、零重力缓慢浮力漂浮、兔子轻跃阻尼微动效、全原生CSS无外部框架
   ========================================================================== */

:root {
  /* 基础调色板 - 日间模式（默认） */
  --sky-top: #3b49df;
  --sky-mid: #6875f5;
  --sky-bottom: #fde2d8;
  --bg-canvas: linear-gradient(180deg, #3b49df 0%, #6366f1 35%, #cbd5e1 70%, #fde2d8 100%);
  --bg-page: #f8fafc;
  
  /* 云朵蹦床软质卡片与张力表面 (Squishy Cloud Trampoline Cushion) */
  --cushion-bg: rgba(255, 255, 255, 0.94);
  --cushion-bg-subtle: rgba(241, 245, 249, 0.88);
  --cushion-border: rgba(255, 255, 255, 0.9);
  --cushion-shadow: 0 20px 40px -10px rgba(59, 73, 223, 0.16), 0 1px 3px rgba(0, 0, 0, 0.05), inset 0 2px 4px rgba(255, 255, 255, 0.95);
  --cushion-shadow-hover: 0 30px 60px -12px rgba(59, 73, 223, 0.28), 0 2px 6px rgba(0, 0, 0, 0.08), inset 0 3px 6px rgba(255, 255, 255, 1);
  --cushion-shadow-inner: inset 0 4px 12px rgba(59, 73, 223, 0.12);

  --text-main: #0f172a;
  --text-muted: #334155;
  --text-subtle: #64748b;
  --text-white: #ffffff;
  --text-hero-desc: #e0e7ff;

  --primary: #3b49df;
  --primary-hover: #2d3bb8;
  --primary-glow: rgba(59, 73, 223, 0.2);
  --accent-peach: #f97316;
  --accent-cyan: #06b6d4;
  --accent-spring: #10b981;
  
  --accent-gradient: linear-gradient(135deg, #3b49df 0%, #6366f1 50%, #06b6d4 100%);
  --accent-bounce-btn: linear-gradient(135deg, #2563eb 0%, #3b49df 100%);
  --accent-peach-glow: linear-gradient(135deg, #f97316 0%, #fb923c 100%);

  --border-glass: rgba(255, 255, 255, 0.4);
  --border-subtle: #e2e8f0;

  /* 蹦床软圆角曲率 */
  --radius-cushion: 30px;
  --radius-pill: 9999px;
  --radius-sm: 12px;

  /* 物理弹簧动力学过渡曲线 (Viscoelastic Spring Damping) */
  --spring-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --spring-soft: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.2s ease;
  --transition-kinetic: 0.45s var(--spring-bounce);
}

/* 零重力夜间深色模式 (Deep Twilight Zero-Gravity) */
[data-theme="dark"] {
  --sky-top: #0d122b;
  --sky-mid: #151d3b;
  --sky-bottom: #23152c;
  --bg-canvas: linear-gradient(180deg, #0d122b 0%, #161e3d 40%, #1d1b38 75%, #23152c 100%);
  --bg-page: #090d1f;

  --cushion-bg: rgba(23, 31, 56, 0.88);
  --cushion-bg-subtle: rgba(30, 41, 74, 0.82);
  --cushion-border: rgba(99, 102, 241, 0.22);
  --cushion-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.6), inset 0 1px 2px rgba(255, 255, 255, 0.08);
  --cushion-shadow-hover: 0 30px 60px -10px rgba(59, 73, 223, 0.45), inset 0 2px 4px rgba(255, 255, 255, 0.15);
  --cushion-shadow-inner: inset 0 4px 14px rgba(0, 0, 0, 0.5);

  --text-main: #f8fafc;
  --text-muted: #cbd5e1;
  --text-subtle: #94a3b8;
  --text-white: #ffffff;
  --text-hero-desc: #c7d2fe;

  --primary: #6366f1;
  --primary-hover: #818cf8;
  --primary-glow: rgba(99, 102, 241, 0.35);
  --border-glass: rgba(255, 255, 255, 0.1);
  --border-subtle: rgba(255, 255, 255, 0.08);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.68;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.4s ease, color 0.4s ease;
}

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

/* 页面主体容器 */
.container {
  width: 100%;
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   背景弹性张力栅格 (Elastic Tension Grid Lines)
   ========================================================================== */
.tension-grid-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 960px;
  background-image: 
    radial-gradient(ellipse at 50% 15%, rgba(253, 226, 216, 0.28) 0%, transparent 65%),
    linear-gradient(to right, rgba(255, 255, 255, 0.08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
  background-size: 100% 100%, 48px 48px, 48px 48px;
  pointer-events: none;
  z-index: 0;
  mask-image: linear-gradient(to bottom, black 65%, transparent 100%);
  -webkit-mask-image: linear-gradient(to bottom, black 65%, transparent 100%);
}

[data-theme="dark"] .tension-grid-bg {
  background-image: 
    radial-gradient(ellipse at 50% 15%, rgba(99, 102, 241, 0.18) 0%, transparent 65%),
    linear-gradient(to right, rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
}

/* ==========================================================================
   零重力动力学物理动效 (@keyframes)
   ========================================================================== */
/* 1. 零重力缓慢浮力漂浮 (Buoyancy Bobbing) */
@keyframes zeroGravityFloat {
  0% {
    transform: translateY(0px) rotate(0deg);
  }
  50% {
    transform: translateY(-12px) rotate(0.4deg);
  }
  100% {
    transform: translateY(0px) rotate(0deg);
  }
}

@keyframes zeroGravityFloatDelayed {
  0% {
    transform: translateY(0px) rotate(0deg);
  }
  50% {
    transform: translateY(10px) rotate(-0.5deg);
  }
  100% {
    transform: translateY(0px) rotate(0deg);
  }
}

.float-buoyant {
  animation: zeroGravityFloat 6s ease-in-out infinite;
}

.float-buoyant-delayed {
  animation: zeroGravityFloatDelayed 7s ease-in-out infinite 1s;
}

/* 2. 兔子轻跃动效 (Bunny-Hop Micro-interaction on Package Cards) */
@keyframes bunnyHopKeyframe {
  0% {
    transform: translateY(0) scale(1);
  }
  30% {
    transform: translateY(-18px) scale(1.025);
  }
  55% {
    transform: translateY(-4px) scale(0.99);
  }
  75% {
    transform: translateY(-10px) scale(1.01);
  }
  100% {
    transform: translateY(-8px) scale(1.015);
  }
}

.bunny-hop-card {
  transition: transform 0.4s var(--spring-bounce), box-shadow 0.4s ease, border-color 0.3s ease;
}

.bunny-hop-card:hover {
  animation: bunnyHopKeyframe 0.6s var(--spring-bounce) forwards;
  box-shadow: var(--cushion-shadow-hover);
  border-color: var(--primary);
}

/* 3. 蹦床弹射弹击 (Trampoline Slingshot Bounce) */
.trampoline-slingshot {
  transition: transform 0.25s var(--spring-bounce), box-shadow 0.25s ease;
  user-select: none;
  cursor: pointer;
}

.trampoline-slingshot:active,
.trampoline-slingshot.stretching {
  transform: scale(0.92, 0.88) translateY(6px);
  box-shadow: var(--cushion-shadow-inner);
}

.trampoline-slingshot.rebounding {
  transform: scale(1.05, 1.08) translateY(-10px);
}

/* 4. 数字弹性浮现 */
@keyframes countPop {
  0% { transform: scale(0.7); opacity: 0; }
  70% { transform: scale(1.15); opacity: 1; }
  100% { transform: scale(1); }
}

.speed-pop-num {
  display: inline-block;
  animation: countPop 0.5s var(--spring-bounce);
}

/* ==========================================================================
   顶栏导航 (Site Header)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-glass);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

[data-theme="dark"] .site-header {
  background: rgba(13, 18, 43, 0.85);
  border-bottom: 1px solid var(--border-glass);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.brand-logo svg {
  width: 36px;
  height: 36px;
  transition: transform 0.3s var(--spring-bounce);
}

.brand-logo:hover svg {
  transform: rotate(-8deg) scale(1.1);
}

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

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  transition: all 0.25s ease;
  position: relative;
}

.nav-link:hover {
  color: var(--primary);
  background: rgba(59, 73, 223, 0.08);
}

/* 新增的‘推荐资讯’徽标高亮微样式 */
.nav-link-radar {
  color: var(--primary);
  background: rgba(59, 73, 223, 0.1);
  border: 1px solid rgba(59, 73, 223, 0.2);
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.nav-link-radar::after {
  content: "NEW";
  font-size: 0.65rem;
  font-weight: 800;
  background: #f97316;
  color: #fff;
  padding: 1px 6px;
  border-radius: 999px;
  line-height: 1.2;
}

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

/* 精致透明化昼夜模式切换按钮 */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.3);
  border: 1px solid var(--border-glass);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
  cursor: pointer;
  color: var(--text-main);
  transition: all var(--transition-kinetic);
  outline: none;
  backdrop-filter: blur(8px);
}

[data-theme="dark"] .theme-toggle-btn {
  background: rgba(30, 41, 74, 0.5);
  border-color: rgba(255, 255, 255, 0.15);
  color: #fbbf24;
}

.theme-toggle-btn:hover {
  transform: scale(1.1) rotate(15deg);
  border-color: var(--primary);
}

.theme-toggle-btn svg {
  width: 22px;
  height: 22px;
}

.theme-toggle-btn .icon-sun {
  display: block;
  color: #d97706;
}

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

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

[data-theme="dark"] .theme-toggle-btn .icon-moon {
  display: block;
}

/* 按钮通用规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 24px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all 0.35s var(--spring-bounce);
  border: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent-bounce-btn);
  color: #ffffff !important;
  box-shadow: 0 8px 20px -4px rgba(37, 99, 235, 0.45);
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 14px 28px -4px rgba(37, 99, 235, 0.55);
}

.btn-secondary {
  background: var(--cushion-bg);
  color: var(--text-main);
  border: 1px solid var(--cushion-border);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

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

.btn-lg {
  padding: 15px 34px;
  font-size: 1.08rem;
}

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

/* ==========================================================================
   主视觉区 (Hero Section - Skyward Canvas & Kinetic Cloud)
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 80px 0 90px;
  background: var(--bg-canvas);
  overflow: hidden;
  text-align: center;
  color: var(--text-white);
  transition: background 0.4s ease;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 940px;
  margin: 0 auto;
}

.hero-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 22px;
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  font-weight: 700;
  backdrop-filter: blur(12px);
  margin-bottom: 28px;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.08);
}

.hero-pill-badge .pulse-orb {
  width: 10px;
  height: 10px;
  background: #34d399;
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(52, 211, 153, 0.3);
}

/* 大标题必须包含“当前品牌名” */
.hero-title {
  font-size: 3.6rem;
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.035em;
  margin-bottom: 24px;
  text-shadow: 0 4px 18px rgba(15, 23, 42, 0.25);
}

.hero-title .brand-highlight {
  display: inline-block;
  background: linear-gradient(135deg, #ffffff 30%, #fde2d8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-decoration: underline;
  text-decoration-color: rgba(253, 226, 216, 0.4);
}

.hero-desc {
  font-size: 1.25rem;
  line-height: 1.75;
  color: var(--text-hero-desc);
  max-width: 780px;
  margin: 0 auto 40px;
  font-weight: 450;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.hero-cta-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 50px;
}

/* 零重力悬浮软垫仪表 (Hero Floating Cushion Metrics) */
.hero-cushion-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 860px;
  margin: 0 auto;
}

.metric-cushion {
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.32);
  border-radius: 24px;
  padding: 22px 18px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  text-align: center;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.08);
  transition: transform 0.35s var(--spring-bounce);
}

.metric-cushion:hover {
  transform: translateY(-6px) scale(1.02);
  background: rgba(255, 255, 255, 0.26);
}

.metric-cushion .num {
  font-size: 2.2rem;
  font-weight: 800;
  display: block;
  line-height: 1.1;
  color: #ffffff;
  margin-bottom: 4px;
}

.metric-cushion .label {
  font-size: 0.88rem;
  font-weight: 700;
  color: #1e293b;
}

[data-theme="dark"] .metric-cushion .label {
  color: #e2e8f0;
}

/* ==========================================================================
   交互特色 1：蹦床弹射测速器 (Trampoline Slingshot Ping)
   ========================================================================== */
.slingshot-section {
  padding: 60px 0 80px;
  background: var(--bg-page);
  position: relative;
  z-index: 10;
}

.section-badge-center {
  text-align: center;
  margin-bottom: 50px;
}

.section-tag-cushion {
  display: inline-block;
  padding: 6px 18px;
  border-radius: var(--radius-pill);
  background: rgba(59, 73, 223, 0.1);
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.section-title-large {
  font-size: 2.3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
  color: var(--text-main);
}

.section-subtitle-muted {
  font-size: 1.05rem;
  color: var(--text-subtle);
  max-width: 660px;
  margin: 0 auto;
}

.slingshot-board {
  background: var(--cushion-bg);
  border: 1px solid var(--cushion-border);
  border-radius: var(--radius-cushion);
  padding: 36px 32px;
  box-shadow: var(--cushion-shadow);
  max-width: 960px;
  margin: 0 auto;
}

.slingshot-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.slingshot-tip {
  font-size: 0.92rem;
  color: var(--text-subtle);
  display: flex;
  align-items: center;
  gap: 8px;
}

.slingshot-tip svg {
  color: var(--primary);
}

.node-cushions-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.node-cushion-item {
  background: var(--cushion-bg-subtle);
  border: 2px solid var(--cushion-border);
  border-radius: 24px;
  padding: 24px 16px;
  text-align: center;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.04);
}

.node-cushion-item .flag {
  font-size: 1.8rem;
  display: block;
  margin-bottom: 8px;
}

.node-cushion-item .name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 4px;
}

.node-cushion-item .proto {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-subtle);
  margin-bottom: 12px;
}

.node-cushion-item .latency-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(16, 185, 129, 0.12);
  color: #10b981;
  font-weight: 800;
  font-size: 0.95rem;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
}

.node-cushion-item.active-test .latency-pill {
  background: rgba(59, 73, 223, 0.15);
  color: var(--primary);
}

/* ==========================================================================
   交互特色 2：橡胶弹力阻尼滑块 (Elastic Tension Slider)
   ========================================================================== */
.elastic-slider-box {
  margin-top: 32px;
  background: rgba(59, 73, 223, 0.04);
  border: 1px dashed var(--primary);
  border-radius: 20px;
  padding: 24px 28px;
}

.slider-top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.slider-label {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

.slider-val-badge {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--primary);
  background: var(--cushion-bg);
  padding: 4px 16px;
  border-radius: var(--radius-pill);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
}

.rubber-slider {
  width: 100%;
  height: 10px;
  border-radius: 5px;
  background: #cbd5e1;
  outline: none;
  -webkit-appearance: none;
  cursor: grab;
  transition: background 0.3s ease;
}

.rubber-slider:active {
  cursor: grabbing;
}

.rubber-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--primary);
  border: 3px solid #ffffff;
  box-shadow: 0 4px 12px rgba(59, 73, 223, 0.5);
  cursor: grab;
  transition: transform 0.2s var(--spring-bounce);
}

.rubber-slider:active::-webkit-slider-thumb {
  transform: scale(1.25);
  background: #2563eb;
}

.slider-recommend-text {
  margin-top: 14px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ==========================================================================
   核心优势 (3个图文软垫卡片)
   ========================================================================== */
.features-section {
  padding: 80px 0;
  background: var(--bg-page);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-cushion-card {
  background: var(--cushion-bg);
  border: 1px solid var(--cushion-border);
  border-radius: var(--radius-cushion);
  padding: 38px 30px;
  box-shadow: var(--cushion-shadow);
  display: flex;
  flex-direction: column;
  transition: all 0.4s var(--spring-bounce);
  position: relative;
  overflow: hidden;
}

.feature-cushion-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--cushion-shadow-hover);
  border-color: var(--primary);
}

.cushion-icon-wrap {
  width: 64px;
  height: 64px;
  border-radius: 22px;
  background: rgba(59, 73, 223, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--primary);
  transition: transform 0.35s var(--spring-bounce);
}

.feature-cushion-card:hover .cushion-icon-wrap {
  transform: scale(1.15) rotate(4deg);
}

.cushion-icon-wrap svg {
  width: 32px;
  height: 32px;
}

.feature-cushion-card h3 {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: var(--text-main);
}

.feature-cushion-card p {
  color: var(--text-muted);
  font-size: 0.96rem;
  line-height: 1.72;
  margin-bottom: 22px;
  flex-grow: 1;
}

.feature-pills-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.feature-pill {
  font-size: 0.8rem;
  font-weight: 700;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  background: var(--cushion-bg-subtle);
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
}

/* ==========================================================================
   流媒体 & AI 支持专属图卡
   ========================================================================== */
.specialty-section {
  padding: 80px 0;
  background: rgba(59, 73, 223, 0.03);
}

.specialty-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.specialty-cushion {
  background: var(--cushion-bg);
  border: 1px solid var(--cushion-border);
  border-radius: var(--radius-cushion);
  padding: 40px;
  box-shadow: var(--cushion-shadow);
  transition: all 0.4s var(--spring-bounce);
}

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

.specialty-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.84rem;
  font-weight: 800;
  margin-bottom: 20px;
}

.badge-stream {
  background: rgba(239, 68, 68, 0.12);
  color: #ef4444;
}

.badge-ai {
  background: rgba(99, 102, 241, 0.12);
  color: #6366f1;
}

.specialty-cushion h3 {
  font-size: 1.65rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: var(--text-main);
}

.specialty-cushion p {
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.7;
  margin-bottom: 26px;
}

.icon-pills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 28px;
}

.icon-pill {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--cushion-bg-subtle);
  border: 1px solid var(--cushion-border);
  border-radius: 16px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-main);
  transition: transform 0.2s ease;
}

.icon-pill:hover {
  transform: scale(1.04);
}

.icon-pill svg {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
}

.specialty-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 20px;
  border-top: 1px solid var(--border-subtle);
}

.metric-text {
  font-size: 0.92rem;
  color: var(--text-subtle);
}

.metric-highlight {
  font-weight: 800;
  color: var(--primary);
}

/* ==========================================================================
   套餐价格对比表 (参考真实网上市场价格体系)
   ========================================================================== */
.pricing-section {
  padding: 90px 0;
  background: var(--bg-page);
}

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

.pricing-cushion-card {
  background: var(--cushion-bg);
  border: 2px solid var(--cushion-border);
  border-radius: var(--radius-cushion);
  padding: 44px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--cushion-shadow);
  transition: all 0.4s var(--spring-bounce);
}

/* 热门主力畅销推荐款 */
.pricing-cushion-card.featured {
  border-color: var(--primary);
  box-shadow: 0 25px 50px -10px var(--primary-glow);
  transform: scale(1.03);
  z-index: 2;
}

.popular-cloud-ribbon {
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-gradient);
  color: #ffffff;
  font-size: 0.84rem;
  font-weight: 800;
  padding: 6px 22px;
  border-radius: var(--radius-pill);
  box-shadow: 0 6px 16px rgba(59, 73, 223, 0.4);
  white-space: nowrap;
}

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

.pricing-title {
  font-size: 1.45rem;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--text-main);
}

.pricing-desc {
  font-size: 0.92rem;
  color: var(--text-subtle);
  min-height: 42px;
}

.pricing-price-wrap {
  display: flex;
  align-items: baseline;
  justify-content: center;
  margin: 18px 0;
}

.price-currency {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--primary);
}

.price-amount {
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--text-main);
  margin: 0 4px;
}

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

.pricing-divider {
  height: 1px;
  background: var(--border-subtle);
  margin: 18px 0 26px;
}

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

.pricing-feature-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.pricing-feature-item svg {
  color: #10b981;
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

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

/* ==========================================================================
   用户评价 (Testimonials)
   ========================================================================== */
.testimonials-section {
  padding: 85px 0;
  background: rgba(59, 73, 223, 0.03);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.testimonial-cushion {
  background: var(--cushion-bg);
  border: 1px solid var(--cushion-border);
  border-radius: var(--radius-cushion);
  padding: 34px;
  box-shadow: var(--cushion-shadow);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.35s var(--spring-bounce);
}

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

.star-rating {
  color: #f59e0b;
  display: flex;
  gap: 4px;
  margin-bottom: 18px;
}

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

.testimonial-text {
  font-size: 0.98rem;
  color: var(--text-main);
  line-height: 1.75;
  margin-bottom: 24px;
}

.user-meta {
  display: flex;
  align-items: center;
  gap: 14px;
}

.user-avatar-cushion {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--accent-gradient);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.15rem;
  box-shadow: 0 4px 12px rgba(59, 73, 223, 0.3);
}

.user-info h4 {
  font-size: 0.98rem;
  font-weight: 800;
}

.user-info p {
  font-size: 0.84rem;
  color: var(--text-subtle);
}

/* ==========================================================================
   常见问题解答 (FAQ Accordion)
   ========================================================================== */
.faq-section {
  padding: 90px 0;
  background: var(--bg-page);
}

.faq-list {
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  background: var(--cushion-bg);
  border: 1px solid var(--cushion-border);
  border-radius: 20px;
  margin-bottom: 16px;
  overflow: hidden;
  box-shadow: var(--cushion-shadow);
  transition: all 0.3s ease;
}

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

.faq-item.active {
  border-color: var(--primary);
  box-shadow: 0 10px 24px -4px var(--primary-glow);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 28px;
  cursor: pointer;
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--text-main);
  background: transparent;
  width: 100%;
  border: none;
  text-align: left;
}

.faq-question:focus-visible {
  outline: 2px solid var(--primary);
}

.faq-chevron {
  width: 22px;
  height: 22px;
  color: var(--text-subtle);
  transition: transform 0.35s var(--spring-bounce);
  flex-shrink: 0;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.38s ease-out, padding 0.38s ease-out;
  padding: 0 28px;
  color: var(--text-muted);
  font-size: 0.96rem;
  line-height: 1.75;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding-bottom: 24px;
}

/* ==========================================================================
   底部 CTA 转化横幅
   ========================================================================== */
.cta-banner-section {
  padding: 80px 0;
  background: var(--bg-page);
}

.cta-banner-box {
  background: var(--accent-gradient);
  border-radius: var(--radius-cushion);
  padding: 64px 44px;
  text-align: center;
  color: #ffffff;
  box-shadow: 0 25px 50px -10px rgba(59, 73, 223, 0.5);
  position: relative;
  overflow: hidden;
}

.cta-banner-box h2 {
  font-size: 2.6rem;
  font-weight: 900;
  margin-bottom: 16px;
}

.cta-banner-box p {
  font-size: 1.15rem;
  max-width: 620px;
  margin: 0 auto 36px;
  opacity: 0.94;
}

.cta-banner-box .btn-white {
  background: #ffffff;
  color: #2563eb !important;
  font-weight: 800;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.cta-banner-box .btn-white:hover {
  background: #f8fafc;
  transform: translateY(-3px) scale(1.03);
}

/* ==========================================================================
   页脚规范 (严格按要求仅保留4个标题)
   ========================================================================== */
.site-footer {
  background: var(--cushion-bg);
  border-top: 1px solid var(--border-subtle);
  padding: 48px 0 36px;
  text-align: center;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

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

.footer-link {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  padding: 6px 8px;
  transition: color var(--transition-fast);
}

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

.footer-copy {
  font-size: 0.88rem;
  color: var(--text-subtle);
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
  max-width: 600px;
  margin: 0 auto;
}

/* ==========================================================================
   子页面专有通用版式 (About, Terms, Privacy, Sitemap, Insights)
   ========================================================================== */
.subpage-hero {
  padding: 70px 0 45px;
  text-align: center;
  background: var(--bg-canvas);
  color: #ffffff;
}

.subpage-hero h1 {
  font-size: 2.8rem;
  font-weight: 900;
  margin-bottom: 16px;
}

.subpage-hero p {
  font-size: 1.15rem;
  color: var(--text-hero-desc);
  max-width: 680px;
  margin: 0 auto;
}

.subpage-content {
  padding: 60px 0 90px;
  background: var(--bg-page);
}

.content-card {
  background: var(--cushion-bg);
  border: 1px solid var(--cushion-border);
  border-radius: var(--radius-cushion);
  padding: 48px;
  box-shadow: var(--cushion-shadow);
  margin-bottom: 32px;
}

.content-card h2 {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-main);
}

.content-card h2 svg {
  color: var(--primary);
  width: 26px;
  height: 26px;
}

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

.content-card ul {
  padding-left: 22px;
  margin-bottom: 22px;
  list-style: disc;
}

.alert-box {
  padding: 18px 24px;
  border-radius: 18px;
  margin: 22px 0;
  font-size: 0.96rem;
  line-height: 1.65;
}

.alert-primary {
  background: rgba(59, 73, 223, 0.1);
  border-left: 4px solid var(--primary);
  color: var(--text-main);
}

.alert-danger {
  background: rgba(239, 68, 68, 0.1);
  border-left: 4px solid #ef4444;
  color: var(--text-main);
}

/* 资讯中心卡片瀑布流 (Insights Feed Layout) */
.insights-feed-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-bottom: 40px;
}

.insight-card {
  background: var(--cushion-bg);
  border: 1px solid var(--cushion-border);
  border-radius: var(--radius-cushion);
  padding: 36px;
  box-shadow: var(--cushion-shadow);
  display: flex;
  flex-direction: column;
  transition: all 0.35s var(--spring-bounce);
}

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

.insight-meta-row {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-subtle);
  margin-bottom: 14px;
}

.insight-tag {
  background: rgba(59, 73, 223, 0.1);
  color: var(--primary);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
}

.insight-card h3 {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-main);
  line-height: 1.45;
}

.insight-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  flex-grow: 1;
  margin-bottom: 20px;
}

/* 网站地图树状样式 */
.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.sitemap-group {
  background: var(--cushion-bg-subtle);
  border-radius: 20px;
  padding: 28px;
  border: 1px solid var(--cushion-border);
}

.sitemap-group h3 {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--text-main);
  border-bottom: 2px solid var(--primary);
  padding-bottom: 8px;
  display: inline-block;
}

.sitemap-group ul li {
  margin-bottom: 12px;
}

.sitemap-group a {
  color: var(--text-muted);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.sitemap-group a:hover {
  color: var(--primary);
  transform: translateX(5px);
}

/* ==========================================================================
   深度 SEO 长文与资讯详情专有版式 (Article Layout, TOC, Tables, Related)
   ========================================================================== */
.article-wrapper {
  max-width: 900px;
  margin: 0 auto;
}

.article-meta-header {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.9rem;
  color: var(--text-subtle);
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.article-badge-category {
  background: rgba(59, 73, 223, 0.12);
  color: var(--primary);
  font-weight: 800;
  padding: 4px 14px;
  border-radius: var(--radius-pill);
}

/* 目录软垫导航盒 (Table of Contents Cushion) */
.article-toc-box {
  background: var(--cushion-bg);
  border: 1px solid var(--cushion-border);
  border-radius: 20px;
  padding: 24px 28px;
  margin: 28px 0 40px;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.04);
}

.toc-header {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 14px;
}

.toc-header svg {
  color: var(--primary);
  width: 22px;
  height: 22px;
}

.toc-list {
  padding-left: 20px;
  list-style: decimal;
}

.toc-list li {
  margin-bottom: 8px;
  font-weight: 600;
}

.toc-list a {
  color: var(--text-muted);
  transition: color 0.2s ease;
}

.toc-list a:hover {
  color: var(--primary);
  text-decoration: underline;
}

/* 文章正文段落与标题层级 */
.article-body h2 {
  font-size: 1.6rem;
  font-weight: 800;
  margin: 44px 0 18px;
  padding-left: 14px;
  border-left: 4px solid var(--primary);
  color: var(--text-main);
  line-height: 1.35;
  scroll-margin-top: 90px;
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 28px 0 14px;
  color: var(--text-main);
  scroll-margin-top: 90px;
}

.article-body p {
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--text-muted);
  margin-bottom: 20px;
}

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

.article-body li {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-muted);
  margin-bottom: 8px;
}

/* 核心推荐与官网首页内链高亮卡片 */
.internal-link-card {
  background: var(--cushion-bg);
  border: 2px solid var(--primary);
  border-radius: 20px;
  padding: 24px 28px;
  margin: 32px 0;
  box-shadow: 0 12px 28px -6px var(--primary-glow);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.internal-link-info h4 {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 6px;
}

.internal-link-info p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* 对比表格样式 */
.article-table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 28px 0;
  border-radius: 16px;
  border: 1px solid var(--border-subtle);
  background: var(--cushion-bg);
}

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

.article-table th {
  background: var(--cushion-bg-subtle);
  padding: 14px 18px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  border-bottom: 2px solid var(--border-subtle);
}

.article-table td {
  padding: 13px 18px;
  font-size: 0.93rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-subtle);
}

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

/* 代码配置块 */
.code-block-box {
  background: #0f172a;
  color: #f8fafc;
  border-radius: 16px;
  padding: 20px 24px;
  margin: 24px 0;
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.9rem;
  line-height: 1.65;
}

/* 文章内置 FAQ 与相关阅读板块 */
.article-faq-section {
  margin-top: 50px;
  padding-top: 36px;
  border-top: 1px solid var(--border-subtle);
}

.related-articles-section {
  margin-top: 50px;
  padding-top: 36px;
  border-top: 1px solid var(--border-subtle);
}

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

.related-card {
  background: var(--cushion-bg);
  border: 1px solid var(--cushion-border);
  border-radius: 18px;
  padding: 20px;
  transition: all 0.3s ease;
  display: block;
}

.related-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.06);
}

.related-card h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.related-card p {
  font-size: 0.88rem;
  color: var(--text-subtle);
  margin: 0;
  line-height: 1.55;
}

/* ==========================================================================
   响应式媒体查询 (@media) - 确保手机移动端优雅自适应
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.9rem;
  }
  .features-grid,
  .pricing-grid,
  .testimonials-grid,
  .insights-feed-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .node-cushions-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-cushion-card.featured {
    transform: none;
  }
}

@media (max-width: 768px) {
  .site-header {
    height: auto;
  }
  .nav-wrap {
    height: 64px;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--cushion-bg);
    border-bottom: 1px solid var(--border-subtle);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
  }
  .nav-links.active {
    display: flex;
  }
  .mobile-menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  .hero-section {
    padding: 55px 0 65px;
  }
  .hero-title {
    font-size: 2.25rem;
  }
  .hero-desc {
    font-size: 1.05rem;
  }
  .hero-cta-wrap {
    flex-direction: column;
    width: 100%;
    gap: 14px;
  }
  .hero-cta-wrap .btn {
    width: 100%;
    height: 52px;
  }
  .hero-cushion-metrics {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .node-cushions-grid,
  .features-grid,
  .specialty-grid,
  .pricing-grid,
  .testimonials-grid,
  .insights-feed-grid,
  .sitemap-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .icon-pills-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .content-card {
    padding: 30px 20px;
  }
  .subpage-hero h1 {
    font-size: 2.15rem;
  }
  .cta-banner-box {
    padding: 44px 24px;
  }
  .cta-banner-box h2 {
    font-size: 1.9rem;
  }
  .footer-nav {
    flex-direction: column;
    gap: 18px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.95rem;
  }
  .icon-pills-grid {
    grid-template-columns: 1fr;
  }
  .price-amount {
    font-size: 2.85rem;
  }
}