/* ==========================================================================
   Now加速专线机场 - 全面 UI 视觉设计与交互引擎
   设计主题：青空风咏 · 浮空结界与青羽流光 (Sky-Aether Sanctuary)
   视觉语言：空之彼方动漫幻想 + 现代高性能微交互
   技术特性：纯原生 CSS/SVG/JS，GPU 硬件加速，零外部依赖，极速无障碍
   ========================================================================== */

:root {
  --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  
  /* 青空风咏配色体系 (严谨 5 维色相调和) */
  --bg-page: #f0f7fc;
  --bg-page-gradient: linear-gradient(180deg, #e8f4fd 0%, #f4f9fd 40%, #f8fafc 100%);
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --bg-card-glass: rgba(255, 255, 255, 0.82);
  --bg-muted: #eaf3fa;
  
  --text-main: #0c1a2e;
  --text-muted: #475569;
  --border-line: #cbd5e1;
  --border-light: #e0edf7;
  --border-glow: rgba(14, 165, 233, 0.35);
  
  /* 品牌天青强调色与能量光系 */
  --accent: #0284c7;
  --accent-light: #0ea5e9;
  --accent-hover: #0369a1;
  --accent-soft: #e0f2fe;
  --accent-glow: rgba(2, 132, 199, 0.25);
  --crystal-gold: #f59e0b;
  
  /* 容器与空间韵律 */
  --container-max: 1140px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  /* 阴影层级 */
  --shadow-sm: 0 2px 8px -1px rgba(12, 26, 46, 0.05);
  --shadow-md: 0 8px 24px -4px rgba(2, 132, 199, 0.08), 0 2px 6px -1px rgba(0, 0, 0, 0.04);
  --shadow-hover: 0 16px 36px -6px rgba(2, 132, 199, 0.16), 0 4px 12px -2px rgba(14, 165, 233, 0.12);
  --shadow-glow: 0 0 24px rgba(14, 165, 233, 0.35);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-stack);
  background: var(--bg-page-gradient);
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 无障碍键盘高亮 */
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

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

img, svg {
  vertical-align: middle;
  max-width: 100%;
}

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

/* ==========================================================================
   动态背景层：青空风羽与星尘微澜 (GPU 加速纯 CSS 粒子)
   ========================================================================== */
.aether-bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

/* 浮空风晶羽毛 */
.aether-feather {
  position: absolute;
  width: 14px;
  height: 28px;
  opacity: 0.45;
  background: radial-gradient(ellipse at center, rgba(14, 165, 233, 0.45) 0%, rgba(56, 189, 248, 0) 70%);
  border-radius: 50% 50% 20% 80% / 60% 40% 60% 40%;
  animation: feather-drift 18s ease-in-out infinite;
}

.aether-feather:nth-child(1) { top: -20px; left: 12%; animation-duration: 16s; animation-delay: 0s; transform: scale(0.9); }
.aether-feather:nth-child(2) { top: -20px; left: 35%; animation-duration: 21s; animation-delay: 4s; transform: scale(1.2); }
.aether-feather:nth-child(3) { top: -20px; left: 68%; animation-duration: 19s; animation-delay: 2s; transform: scale(0.8); }
.aether-feather:nth-child(4) { top: -20px; left: 88%; animation-duration: 24s; animation-delay: 7s; transform: scale(1.1); }

@keyframes feather-drift {
  0% {
    transform: translateY(-40px) translateX(0) rotate(0deg);
    opacity: 0;
  }
  15% {
    opacity: 0.5;
  }
  50% {
    transform: translateY(50vh) translateX(45px) rotate(45deg);
    opacity: 0.6;
  }
  85% {
    opacity: 0.4;
  }
  100% {
    transform: translateY(105vh) translateX(-30px) rotate(110deg);
    opacity: 0;
  }
}

/* 光之呼吸浮尘 */
.aether-mote {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(circle, #38bdf8 0%, rgba(14, 165, 233, 0) 70%);
  animation: mote-shimmer 6s ease-in-out infinite alternate;
}

.aether-mote:nth-child(5) { top: 22%; left: 18%; width: 6px; height: 6px; animation-delay: 1s; }
.aether-mote:nth-child(6) { top: 48%; left: 82%; width: 8px; height: 8px; animation-delay: 2.5s; }
.aether-mote:nth-child(7) { top: 76%; left: 28%; width: 5px; height: 5px; animation-delay: 4s; }

@keyframes mote-shimmer {
  0% { transform: scale(0.8) translateY(0); opacity: 0.2; }
  100% { transform: scale(1.3) translateY(-18px); opacity: 0.65; }
}

/* ==========================================================================
   布局网格与容器
   ========================================================================== */
.site-container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   Header 顶部导航 (吸顶磨砂玻璃 + 结界流光)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-light);
  box-shadow: 0 4px 16px -2px rgba(12, 26, 46, 0.03);
  transition: all 0.25s ease;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
  min-height: 44px;
  transition: transform 0.2s ease;
}

.site-header__brand:hover {
  transform: translateY(-1px);
}

.site-header__brand svg {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  filter: drop-shadow(0 2px 6px rgba(2, 132, 199, 0.25));
}

.site-header__nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-header__link {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 600;
  transition: color 0.18s ease;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  position: relative;
}

.site-header__link::after {
  content: '';
  position: absolute;
  bottom: 8px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: var(--radius-full);
  transition: width 0.22s ease;
}

.site-header__link:hover {
  color: var(--accent);
}

.site-header__link:hover::after,
.site-header__link--active::after {
  width: 100%;
}

.site-header__link--active {
  color: var(--accent);
}

.site-header__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
  color: #ffffff;
  font-size: 0.92rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.28);
  position: relative;
  overflow: hidden;
  transition: all 0.2s ease;
}

.site-header__cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(2, 132, 199, 0.38);
}

.site-header__toggle {
  display: none;
  min-height: 44px;
  min-width: 44px;
  align-items: center;
  justify-content: center;
  padding: 10px;
  color: var(--text-main);
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   高转化动漫 CTA 按钮体系 (呼吸光效、流光扫过、波纹反馈)
   ========================================================================== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 32px;
  background: linear-gradient(135deg, #0284c7 0%, #0ea5e9 100%);
  color: #ffffff;
  font-size: 1.02rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.25);
  box-shadow: 0 6px 20px rgba(2, 132, 199, 0.3);
  position: relative;
  overflow: hidden;
  cursor: pointer;
  text-align: center;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

/* 动感扫光条 */
.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  transform: skewX(-20deg);
  animation: cta-sheen 4.5s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

@keyframes cta-sheen {
  0%, 60% { left: -100%; }
  100% { left: 200%; }
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(2, 132, 199, 0.45);
}

.btn-primary:active {
  transform: translateY(0) scale(0.98);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 30px;
  background-color: rgba(255, 255, 255, 0.95);
  color: var(--text-main);
  font-size: 1.02rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: all 0.18s ease;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.btn-secondary:hover {
  border-color: var(--accent-light);
  background-color: #ffffff;
  color: var(--accent);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary:active {
  transform: translateY(0) scale(0.98);
}

/* 按钮点击水波纹 (Ripple Feedback) */
.btn-ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.45);
  transform: scale(0);
  animation: ripple-anim 0.6s linear;
  pointer-events: none;
}

.btn-secondary .btn-ripple {
  background: rgba(2, 132, 199, 0.22);
}

@keyframes ripple-anim {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* 卡片鼠标悬浮微光跟随 (Card Spotlight) */
.benefit-card::after,
.feature-box::after,
.scenario-card::after,
.pricing-card::after {
  content: '';
  position: absolute;
  top: var(--mouse-y, -1000px);
  left: var(--mouse-x, -1000px);
  width: 260px;
  height: 260px;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(56, 189, 248, 0.12) 0%, rgba(56, 189, 248, 0) 70%);
  border-radius: 50%;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.25s ease;
  z-index: 1;
}

.benefit-card:hover::after,
.feature-box:hover::after,
.scenario-card:hover::after,
.pricing-card:hover::after {
  opacity: 1;
}

/* 滚动平滑逐次淡入 (Reveal on Scroll) */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.45s cubic-bezier(0.16, 1, 0.3, 1), transform 0.45s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-on-scroll.is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================================================
   Hero 主视觉区 (动漫双栏: 价值文案 + 空导核心枢纽)
   ========================================================================== */
.hero-block {
  padding: 72px 0 64px;
  position: relative;
}

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

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

.hero-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-full);
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 20px;
  box-shadow: 0 2px 10px rgba(14, 165, 233, 0.12);
}

.hero-badge-pill__dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-light);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-light);
  animation: dot-pulse 2s infinite ease-in-out;
}

@keyframes dot-pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.4); opacity: 0.6; }
}

.hero-block__title {
  font-size: 2.75rem;
  line-height: 1.25;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero-block__lead {
  font-size: 1.15rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 32px;
  max-width: 580px;
}

.hero-block__actions {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 40px;
}

.hero-block__specs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  padding-top: 28px;
  border-top: 1px solid var(--border-light);
}

.hero-spec-item {
  padding: 14px 16px;
  background-color: var(--bg-card-glass);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(8px);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.hero-spec-item:hover {
  transform: translateY(-2px);
  border-color: var(--border-glow);
}

.hero-spec-item__title {
  font-size: 0.88rem;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 4px;
}

.hero-spec-item__desc {
  font-size: 0.88rem;
  color: var(--text-main);
  line-height: 1.45;
}

/* 右侧动漫矢量枢纽：风之空导核心 (Sky-Aether Beacon) */
.hero-visual-hub {
  position: relative;
  width: 100%;
  max-width: 440px;
  margin: 0 auto;
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-visual-hub__canvas {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 12px 32px rgba(2, 132, 199, 0.22));
}

/* SVG 内部动力学动画 */
@keyframes ring-spin-cw {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes ring-spin-ccw {
  from { transform: rotate(0deg); }
  to { transform: rotate(-360deg); }
}

@keyframes crystal-levitate {
  0%, 100% { transform: translateY(0) scale(1); filter: drop-shadow(0 4px 14px rgba(14, 165, 233, 0.6)); }
  50% { transform: translateY(-10px) scale(1.04); filter: drop-shadow(0 12px 24px rgba(14, 165, 233, 0.85)); }
}

@keyframes pulse-wave {
  0% { r: 18; opacity: 0.8; }
  100% { r: 42; opacity: 0; }
}

.svg-spin-outer {
  transform-origin: 220px 220px;
  animation: ring-spin-cw 36s linear infinite;
}

.svg-spin-inner {
  transform-origin: 220px 220px;
  animation: ring-spin-ccw 24s linear infinite;
}

.svg-crystal-core {
  transform-origin: 220px 220px;
  animation: crystal-levitate 4s ease-in-out infinite;
}

.svg-pulse-wave {
  animation: pulse-wave 2.8s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

/* ==========================================================================
   内容模块全局包装与排版
   ========================================================================== */
.section-wrap {
  padding: 72px 0;
  position: relative;
}

.section-wrap--alt {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 48px;
}

.section-head__tag {
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
  display: block;
}

.section-head__title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

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

/* ==========================================================================
   Benefits 核心优势网格 (卡片悬浮与微光跟随)
   ========================================================================== */
.benefit-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.benefit-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 32px 26px;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

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

.benefit-card__icon {
  width: 52px;
  height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent-soft) 0%, #bae6fd 100%);
  color: var(--accent);
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.15);
  transition: transform 0.25s ease;
}

.benefit-card:hover .benefit-card__icon {
  transform: scale(1.08) rotate(3deg);
}

.benefit-card__title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
}

.benefit-card__desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ==========================================================================
   Features 专线特性 (4卡双栏拓扑)
   ========================================================================== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.feature-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  gap: 20px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}

.feature-box:hover {
  transform: translateY(-3px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-md);
}

.feature-box__badge {
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  height: fit-content;
  white-space: nowrap;
  border: 1px solid rgba(14, 165, 233, 0.2);
}

.feature-box__content {
  flex: 1;
}

.feature-box__title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 8px;
}

.feature-box__desc {
  font-size: 0.94rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ==========================================================================
   Support Dual 流媒体与 AI 支持 (生态看板)
   ========================================================================== */
.support-dual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.support-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 34px;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.support-panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent-light) 100%);
}

.support-panel__title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.support-panel__title svg {
  color: var(--accent);
  flex-shrink: 0;
}

.support-panel__desc {
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 24px;
}

.support-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.support-list__item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.94rem;
  color: var(--text-main);
  line-height: 1.5;
}

.support-list__item svg {
  color: var(--accent);
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-top: 2px;
}

/* ==========================================================================
   使用场景卡 (3张，覆盖学生、上班族、商务)
   ========================================================================== */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.scenario-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: all 0.22s ease;
  display: flex;
  flex-direction: column;
}

.scenario-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-md);
}

.scenario-card__tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 10px;
}

.scenario-card__title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
}

.scenario-card__meta {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
}

.scenario-card__desc {
  font-size: 0.94rem;
  color: var(--text-muted);
  line-height: 1.65;
  flex: 1;
}

/* ==========================================================================
   Pricing 定价区 (3档，推荐中档视觉突出)
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.pricing-card--featured {
  border: 2px solid var(--accent);
  background-color: #ffffff;
  box-shadow: var(--shadow-md);
}

.pricing-card__flag {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.35);
}

.pricing-card__target {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.pricing-card__name {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 14px;
}

.pricing-card__cost {
  margin-bottom: 16px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.pricing-card__amount {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1;
}

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

.pricing-card__traffic {
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 22px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-light);
}

.pricing-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 34px;
  flex: 1;
}

.pricing-features__item {
  font-size: 0.92rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 10px;
}

.pricing-features__item svg {
  color: var(--accent);
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

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

/* ==========================================================================
   FAQ 折叠列表
   ========================================================================== */
.faq-box {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-unit {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s ease;
}

.faq-unit[open] {
  border-color: var(--border-glow);
}

.faq-unit__question {
  width: 100%;
  text-align: left;
  padding: 18px 24px;
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  cursor: pointer;
  min-height: 48px;
  user-select: none;
}

.faq-unit__icon {
  width: 22px;
  height: 22px;
  color: var(--text-muted);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

.faq-unit[open] .faq-unit__icon {
  transform: rotate(180deg);
  color: var(--accent);
}

.faq-unit__answer {
  padding: 0 24px 22px;
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   Final CTA 倒数第二区块
   ========================================================================== */
.final-cta {
  padding: 76px 0;
  position: relative;
}

.final-cta__box {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(224, 242, 254, 0.8) 100%);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 56px 36px;
  text-align: center;
  max-width: 880px;
  margin: 0 auto;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.final-cta__title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.final-cta__desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

.final-cta__actions {
  display: flex;
  justify-content: center;
  gap: 16px;
}

/* ==========================================================================
   Footer 网站页脚 (严格遵循规范：仅放导航与版权，含联盟披露，无文章列表)
   ========================================================================== */
.site-footer {
  background-color: rgba(255, 255, 255, 0.92);
  border-top: 1px solid var(--border-light);
  padding: 48px 0 36px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.site-footer__inner {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.site-footer__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-light);
}

.site-footer__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-main);
}

.site-footer__brand svg {
  width: 28px;
  height: 28px;
}

.site-footer__nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
}

.site-footer__nav a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  color: var(--text-muted);
  font-weight: 500;
  transition: color 0.18s ease;
}

.site-footer__nav a:hover {
  color: var(--accent);
}

.site-footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.86rem;
  color: var(--text-muted);
}

.site-footer__disclosure {
  font-size: 0.86rem;
  color: var(--text-muted);
}

/* ==========================================================================
   面包屑与子页面英雄区
   ========================================================================== */
.page-hero {
  padding: 52px 0 38px;
  background: rgba(255, 255, 255, 0.85);
  border-bottom: 1px solid var(--border-light);
}

.breadcrumb-bar {
  margin-bottom: 16px;
  font-size: 0.86rem;
  color: var(--text-muted);
}

.breadcrumb-bar a {
  color: var(--text-muted);
  transition: color 0.15s ease;
}

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

.breadcrumb-bar span {
  margin: 0 6px;
}

.page-hero__title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 12px;
}

.page-hero__meta {
  font-size: 0.9rem;
  color: var(--text-muted);
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

/* 文章排版 */
.article-layout {
  padding: 52px 0 68px;
}

.article-content {
  max-width: 840px;
  margin: 0 auto;
  background-color: var(--bg-card);
  padding: 44px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.article-body {
  font-size: 1.06rem;
  line-height: 1.85;
  color: #334155;
}

.article-body p {
  margin-bottom: 22px;
}

.article-body h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-main);
  margin-top: 42px;
  margin-bottom: 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-light);
}

.article-body h3 {
  font-size: 1.28rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 28px;
  margin-bottom: 12px;
}

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

.article-body li {
  margin-bottom: 8px;
}

.article-body a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 600;
}

.article-body a:hover {
  color: var(--accent-hover);
}

.article-callout {
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  padding: 18px 22px;
  margin: 28px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.96rem;
  color: var(--text-main);
}

.article-cta-box {
  margin-top: 52px;
  padding: 36px 32px;
  background: linear-gradient(135deg, var(--accent-soft) 0%, #bae6fd 100%);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-md);
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.article-cta-box__title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 10px;
}

.article-cta-box__desc {
  font-size: 0.96rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

/* 法律合规页面 */
.legal-card {
  max-width: 860px;
  margin: 44px auto 64px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 44px;
  box-shadow: var(--shadow-sm);
}

.legal-card h2 {
  font-size: 1.38rem;
  font-weight: 800;
  color: var(--text-main);
  margin-top: 34px;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-light);
}

.legal-card h2:first-of-type {
  margin-top: 0;
}

.legal-card p {
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 16px;
}

.legal-card ul {
  padding-left: 20px;
  margin-bottom: 20px;
  color: var(--text-muted);
  font-size: 0.96rem;
}

.legal-card li {
  margin-bottom: 8px;
}

/* 指南卡片网格 */
.guides-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-top: 36px;
}

.guide-item-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}

.guide-item-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-md);
}

.guide-item-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.guide-item-card__thumb {
  width: 48px;
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent-soft) 0%, #bae6fd 100%);
  color: var(--accent);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(2, 132, 199, 0.15);
}

.guide-item-card__meta-bar {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.guide-item-card__title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
  line-height: 1.4;
}

.guide-item-card__desc {
  font-size: 0.94rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 22px;
  flex: 1;
}

.guide-item-card__link {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--accent);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

/* 移动端吸底 CTA 栏 */
.mobile-sticky-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 99;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--border-light);
  padding: 10px 16px;
  box-shadow: 0 -4px 16px rgba(12, 26, 46, 0.08);
}

.mobile-sticky-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.mobile-sticky-bar__info {
  display: flex;
  flex-direction: column;
}

.mobile-sticky-bar__text {
  font-size: 0.88rem;
  font-weight: 800;
  color: var(--text-main);
}

.mobile-sticky-bar__sub {
  font-size: 0.76rem;
  color: var(--text-muted);
}

.mobile-sticky-bar__btn {
  padding: 0 20px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
  color: #ffffff;
  font-size: 0.92rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

/* ==========================================================================
   响应式断点控制
   ========================================================================== */
@media (max-width: 992px) {
  .hero-block__dual {
    grid-template-columns: 1fr;
    gap: 48px;
  }

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

  .hero-block__lead {
    margin-left: auto;
    margin-right: auto;
  }

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

  .benefit-grid,
  .scenario-grid,
  .pricing-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .site-header__nav {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-light);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    box-shadow: 0 10px 25px -4px rgba(12, 26, 46, 0.1);
  }

  .site-header__nav.is-open {
    display: flex;
  }

  .site-header__toggle {
    display: inline-flex;
  }

  .hero-block__title {
    font-size: 2rem;
  }

  .hero-block__specs {
    grid-template-columns: 1fr;
  }

  .feature-grid,
  .support-dual,
  .guides-grid {
    grid-template-columns: 1fr;
  }

  .hero-block__actions,
  .final-cta__actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-block__actions .btn-primary,
  .hero-block__actions .btn-secondary,
  .final-cta__actions .btn-primary,
  .final-cta__actions .btn-secondary {
    width: 100%;
  }

  .site-footer__top,
  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .article-content,
  .legal-card {
    padding: 26px 18px;
  }

  .mobile-sticky-bar {
    display: block;
  }

  body {
    padding-bottom: 64px;
  }
}

/* 无障碍：支持 prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .svg-spin-outer, .svg-spin-inner, .svg-crystal-core, .svg-pulse-wave, .aether-feather, .aether-mote {
    animation: none !important;
  }
}