/* ===================================================================
   CyberGuard机场 — 苍穹星港 · 樱华云旅 (Azure Sky-Harbor & Sakura Zephyr)
   视觉定位：新海诚风·苍穹晨曦与樱吹雪浮空航标
   核心特性：清透云上琉璃、樱花飘拂、全息航标HUD、3D悬停微倾斜、光泽扫过CTA、零外部依赖
   =================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* 苍穹晨曦与樱华色彩系统 */
  --sky-dawn: #f0f7ff;
  --sky-blue-50: #f0f9ff;
  --sky-blue-100: #e0f2fe;
  --sky-blue-500: #0ea5e9;
  --sky-blue-600: #0284c7;
  --sky-blue-700: #0369a1;
  --sky-deep: #075985;
  --sky-night: #0b192c;

  /* 樱花粉与暖阳金强调色 */
  --sakura-pink: #f43f5e;
  --sakura-pink-hover: #e11d48;
  --sakura-light: #ffe4e6;
  --sakura-glow: rgba(244, 63, 94, 0.28);
  --sun-gold: #f59e0b;
  --sun-gold-glow: rgba(245, 158, 11, 0.24);
  --emerald-green: #10b981;

  /* 云端琉璃材质与边框 */
  --bg-page: #f4f9fd;
  --bg-surface: #ffffff;
  --bg-glass-card: rgba(255, 255, 255, 0.88);
  --bg-glass-card-hover: rgba(255, 255, 255, 0.98);
  --border-glass: rgba(186, 230, 253, 0.65);
  --border-glass-hover: rgba(14, 165, 233, 0.5);
  --border-featured: rgba(244, 63, 94, 0.55);

  /* 文字颜色层级（高对比保障无障碍） */
  --text-main: #0f172a;
  --text-body: #1e293b;
  --text-muted: #475569;
  --text-light: #64748b;

  /* 光影与圆角 */
  --shadow-sm: 0 2px 8px rgba(2, 132, 199, 0.06);
  --shadow-md: 0 8px 24px rgba(2, 132, 199, 0.08), 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 16px 36px rgba(2, 132, 199, 0.12), 0 2px 6px rgba(0, 0, 0, 0.04);
  --shadow-sakura: 0 10px 30px rgba(244, 63, 94, 0.22);
  --glow-cta: 0 0 24px rgba(2, 132, 199, 0.35);

  --max-width: 1160px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-body);
  line-height: 1.68;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow-x: hidden;
}

/* ================= 樱华苍穹背景舞台 ================= */
.anime-sky-stage {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

/* 苍穹晨光渐变与柔和微光 */
.sky-sun-glow {
  position: absolute;
  top: -20%;
  right: -10%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.22) 0%, rgba(251, 113, 133, 0.12) 40%, rgba(240, 249, 255, 0) 70%);
  filter: blur(50px);
  border-radius: 50%;
}

.sky-cloud-mist {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 380px;
  background: linear-gradient(to top, rgba(255, 255, 255, 0.95), rgba(244, 249, 253, 0));
}

/* 流星划空动效 */
.meteor-streak {
  position: absolute;
  width: 180px;
  height: 2px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0), rgba(56, 189, 248, 0.8), rgba(255, 255, 255, 1));
  opacity: 0;
  transform: rotate(-35deg);
  animation: meteorFall 10s ease-in-out infinite;
}

.meteor-1 {
  top: 15%;
  right: 25%;
  animation-delay: 2s;
}

.meteor-2 {
  top: 30%;
  right: 50%;
  animation-delay: 7s;
}

@keyframes meteorFall {
  0% {
    transform: translate(120px, -80px) rotate(-35deg);
    opacity: 0;
  }
  15% {
    opacity: 0.85;
  }
  30% {
    transform: translate(-300px, 200px) rotate(-35deg);
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}

/* 飘落樱花花瓣 Canvas */
#sakura-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

/* 基础通用布局 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
  position: relative;
  z-index: 2;
}

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

a {
  color: var(--sky-blue-600);
  text-decoration: none;
  transition: all 0.2s ease;
}

a:hover {
  color: var(--sakura-pink);
}

ul, ol {
  list-style: none;
}

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

/* ================= 导航 Header ================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.82);
  border-bottom: 1px solid var(--border-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.site-header.is-scrolled {
  background-color: rgba(255, 255, 255, 0.96);
  box-shadow: 0 4px 20px rgba(2, 132, 199, 0.08);
}

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

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--text-main);
  letter-spacing: -0.01em;
}

.logo-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.25);
  transition: transform 0.25s ease;
}

.site-logo:hover .logo-badge {
  transform: rotate(6deg) scale(1.05);
}

.brand-caption {
  font-size: 0.6875rem;
  font-family: var(--font-mono);
  color: var(--sky-blue-600);
  background-color: var(--sky-blue-100);
  padding: 0.125rem 0.375rem;
  border-radius: 4px;
  margin-left: 0.25rem;
}

.site-nav {
  display: none;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-muted);
  position: relative;
  padding: 0.375rem 0;
  transition: color 0.2s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--sky-blue-600), var(--sakura-pink));
  transition: width 0.25s ease, left 0.25s ease;
  border-radius: 2px;
}

.nav-link:hover, .nav-link.active {
  color: var(--sky-blue-600);
}

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

.header-action {
  display: flex;
  align-items: center;
  gap: 0.875rem;
}

.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  background-color: rgba(255, 255, 255, 0.9);
  color: var(--text-main);
  transition: border-color 0.2s, background-color 0.2s;
}

.menu-toggle:hover {
  border-color: var(--sky-blue-500);
  color: var(--sky-blue-600);
}

/* ================= 按钮与高转化 CTA 交互引擎 ================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.35rem;
  font-size: 0.9375rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.2s cubic-bezier(0.16, 1, 0.3, 1), background-color 0.2s ease, border-color 0.2s ease;
  white-space: nowrap;
  user-select: none;
}

/* 主 CTA：苍穹蔚蓝渐层 + 呼吸光晕 + 光泽扫过 */
.btn-primary {
  background: linear-gradient(135deg, #0284c7 0%, #2563eb 100%);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.35);
  box-shadow: 0 4px 16px rgba(2, 132, 199, 0.32), inset 0 1px 1px rgba(255, 255, 255, 0.4);
}

.btn-primary::before {
  content: "";
  position: absolute;
  top: 0;
  left: -120%;
  width: 60%;
  height: 100%;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.35) 50%, rgba(255, 255, 255, 0) 100%);
  transform: skewX(-25deg);
  transition: left 0.75s ease;
}

.btn-primary:hover {
  background: linear-gradient(135deg, #0369a1 0%, #1d4ed8 100%);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(2, 132, 199, 0.45), inset 0 1px 1px rgba(255, 255, 255, 0.5);
}

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

.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(2, 132, 199, 0.3);
}

/* 樱华粉推荐 CTA（用于定价中心卡） */
.btn-sakura {
  background: linear-gradient(135deg, #f43f5e 0%, #fb7185 100%);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: 0 4px 18px rgba(244, 63, 94, 0.35), inset 0 1px 1px rgba(255, 255, 255, 0.4);
}

.btn-sakura::before {
  content: "";
  position: absolute;
  top: 0;
  left: -120%;
  width: 60%;
  height: 100%;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.4) 50%, rgba(255, 255, 255, 0) 100%);
  transform: skewX(-25deg);
  transition: left 0.75s ease;
}

.btn-sakura:hover {
  background: linear-gradient(135deg, #e11d48 0%, #f43f5e 100%);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 8px 26px rgba(244, 63, 94, 0.48);
}

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

.btn-sakura:active {
  transform: translateY(0);
}

/* 次级按钮：清透云璃描边 */
.btn-outline {
  background-color: rgba(255, 255, 255, 0.75);
  color: var(--text-main);
  border: 1px solid var(--border-glass);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
}

.btn-outline:hover {
  background-color: #ffffff;
  color: var(--sky-blue-600);
  border-color: var(--sky-blue-500);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(2, 132, 199, 0.12);
}

.btn-outline:active {
  transform: translateY(0);
}

.btn-lg {
  padding: 0.875rem 2rem;
  font-size: 1.0625rem;
  border-radius: var(--radius-md);
}

.btn-block {
  width: 100%;
}

/* 点击涟漪扩散动画 */
.click-ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  transform: scale(0);
  animation: rippleSpread 0.55s ease-out;
  pointer-events: none;
}

@keyframes rippleSpread {
  to {
    transform: scale(3.5);
    opacity: 0;
  }
}

/* 移动端菜单抽屉 */
.mobile-drawer {
  display: none;
  background-color: rgba(255, 255, 255, 0.98);
  border-bottom: 1px solid var(--border-glass);
  padding: 1.5rem;
  backdrop-filter: blur(16px);
  box-shadow: 0 12px 30px rgba(2, 132, 199, 0.1);
}

.mobile-drawer.is-open {
  display: block;
  animation: drawerSlideDown 0.25s ease-out;
}

@keyframes drawerSlideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  margin-bottom: 1.5rem;
}

.mobile-nav-link {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-main);
  padding: 0.375rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ================= Hero 区域：动漫领航员与全息航空舱 ================= */
.hero-section {
  padding: 4rem 0 3.5rem;
  position: relative;
  overflow: hidden;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}

.hero-text-block {
  display: flex;
  flex-direction: column;
}

/* 全息航标徽章 */
.hero-hud-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  background: linear-gradient(90deg, rgba(224, 242, 254, 0.8) 0%, rgba(255, 228, 230, 0.6) 100%);
  border: 1px solid rgba(56, 189, 248, 0.4);
  color: var(--sky-blue-700);
  font-size: 0.8125rem;
  font-weight: 700;
  font-family: var(--font-mono);
  border-radius: 9999px;
  width: fit-content;
  margin-bottom: 1.25rem;
  box-shadow: 0 2px 10px rgba(2, 132, 199, 0.08);
}

.hud-spark {
  color: var(--sakura-pink);
  animation: sparkPulse 2s ease-in-out infinite;
}

@keyframes sparkPulse {
  0%, 100% { transform: scale(1); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; }
}

.hero-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-main);
  margin-bottom: 1.15rem;
  letter-spacing: -0.025em;
}

.hero-title-accent {
  background: linear-gradient(135deg, var(--sky-blue-600) 0%, var(--sakura-pink) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  position: relative;
  display: inline-block;
}

.hero-description {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text-muted);
  margin-bottom: 2rem;
  max-width: 580px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

/* 信任指标网格 */
.hero-meta-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border-glass);
}

.meta-stat-item {
  display: flex;
  flex-direction: column;
}

.meta-stat-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.meta-stat-desc {
  font-size: 0.775rem;
  color: var(--text-light);
  margin-top: 0.2rem;
}

/* Hero 右侧：动漫领航员立绘与交互式航空仪 */
.hero-navigator-card {
  position: relative;
  background: var(--bg-glass-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  overflow: hidden;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s ease;
}

.hero-navigator-card:hover {
  border-color: var(--border-glass-hover);
  box-shadow: 0 20px 48px rgba(2, 132, 199, 0.16);
}

.card-hud-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 0.875rem;
  border-bottom: 1px solid var(--border-glass);
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.hud-flight-id {
  color: var(--sky-blue-600);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.hud-flight-beacon {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--emerald-green);
  box-shadow: 0 0 8px var(--emerald-green);
  animation: beaconBlink 2.2s ease-in-out infinite;
}

@keyframes beaconBlink {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.hud-altitude-tag {
  color: var(--text-light);
  font-weight: 600;
}

/* 动漫角色视窗 */
.navigator-viewport {
  position: relative;
  width: 100%;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: linear-gradient(180deg, #bae6fd 0%, #e0f2fe 100%);
  border: 1px solid rgba(255, 255, 255, 0.7);
}

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

.hero-navigator-card:hover .navigator-portrait-img {
  transform: scale(1.03);
}

/* 浮动交互对白气泡（带有小助手吉祥物） */
.pilot-dialogue-bubble {
  position: absolute;
  bottom: 12px;
  left: 12px;
  right: 12px;
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid rgba(56, 189, 248, 0.5);
  border-radius: var(--radius-md);
  padding: 0.75rem 0.875rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(8px);
  cursor: pointer;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  user-select: none;
}

.pilot-dialogue-bubble:hover {
  transform: translateY(-2px);
  border-color: var(--sakura-pink);
  box-shadow: 0 8px 24px rgba(244, 63, 94, 0.18);
}

.bubble-companion-mini {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 2px solid #ffffff;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  flex-shrink: 0;
  object-fit: cover;
}

.bubble-text-msg {
  font-size: 0.8125rem;
  color: var(--text-main);
  line-height: 1.45;
  font-weight: 600;
}

.bubble-hint {
  font-size: 0.6875rem;
  color: var(--sky-blue-600);
  font-family: var(--font-mono);
  display: block;
  margin-top: 0.15rem;
}

/* 领航员仪表遥测托盘 */
.navigator-telemetry-tray {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.telemetry-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8125rem;
}

.telemetry-node-name {
  color: var(--text-muted);
  font-weight: 500;
}

.telemetry-latency {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--sky-blue-700);
}

.telemetry-progress-track {
  width: 100%;
  height: 6px;
  background-color: rgba(224, 242, 254, 0.8);
  border-radius: 9999px;
  overflow: hidden;
  position: relative;
}

.telemetry-progress-fill {
  width: 88%;
  height: 100%;
  background: linear-gradient(90deg, #38bdf8, #0284c7, #f43f5e);
  border-radius: 9999px;
  animation: telemetryPulse 3s ease-in-out infinite alternate;
}

@keyframes telemetryPulse {
  0% { width: 82%; }
  100% { width: 94%; }
}

/* ================= 通用区块骨架 ================= */
.content-section {
  padding: 4.5rem 0;
  position: relative;
  z-index: 2;
}

.section-head {
  max-width: 700px;
  margin-bottom: 2.75rem;
}

.section-kicker {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 800;
  color: var(--sky-blue-600);
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
  background-color: var(--sky-blue-100);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 0.75rem;
  letter-spacing: -0.015em;
}

.section-summary {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ================= 1. AI 支持 (AI Tools - 4卡) ================= */
.ai-support-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.ai-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(8px);
  position: relative;
  overflow: hidden;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.ai-card:hover {
  transform: translateY(-4px);
  border-color: var(--sky-blue-500);
  box-shadow: var(--shadow-md);
}

.ai-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.ai-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.ai-tag {
  font-size: 0.6875rem;
  font-family: var(--font-mono);
  color: var(--sky-blue-600);
  background: var(--sky-blue-100);
  padding: 0.125rem 0.375rem;
  border-radius: 4px;
}

.ai-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ================= 2. 核心特性 (Features - 4卡) ================= */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.35rem;
}

.feature-box {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(8px);
  position: relative;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.feature-box:hover {
  transform: translateY(-5px);
  border-color: var(--sky-blue-500);
  box-shadow: var(--shadow-md);
}

.feature-icon-wrap {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--sky-blue-100), #ffffff);
  border: 1px solid rgba(56, 189, 248, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--sky-blue-600);
  margin-bottom: 1rem;
  box-shadow: 0 4px 10px rgba(2, 132, 199, 0.08);
}

.feature-number {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--sky-blue-600);
  margin-bottom: 0.5rem;
}

.feature-heading {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.625rem;
}

.feature-text {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ================= 3. 核心优势 (Benefits - 3卡) ================= */
.benefits-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.35rem;
}

.benefit-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.benefit-card:hover {
  transform: translateY(-4px);
  border-color: var(--sky-blue-500);
  box-shadow: var(--shadow-md);
}

.benefit-badge {
  display: inline-block;
  font-size: 0.6875rem;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--sakura-pink);
  background: var(--sakura-light);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  margin-bottom: 0.75rem;
}

.benefit-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.625rem;
}

.benefit-text {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ================= 4. 流媒体支持 (Streaming - 4卡) ================= */
.streaming-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.streaming-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 1.35rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.streaming-card:hover {
  transform: translateY(-3px);
  border-color: var(--sky-blue-500);
}

.streaming-platform {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.streaming-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* ================= 5. 使用场景卡 (Scenarios - 3卡) ================= */
.scenarios-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.35rem;
}

.scenario-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.scenario-card:hover {
  transform: translateY(-4px);
  border-color: var(--sky-blue-500);
  box-shadow: var(--shadow-md);
}

.scenario-header {
  margin-bottom: 0.875rem;
}

.scenario-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
}

.scenario-device {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.775rem;
  color: var(--sky-blue-700);
  font-weight: 600;
  background-color: var(--sky-blue-100);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  margin-top: 0.5rem;
  font-family: var(--font-mono);
}

.scenario-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ================= 6. 定价区 (Pricing - 3档) ================= */
.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 2.25rem 1.75rem;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(8px);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s ease, border-color 0.3s ease;
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--sky-blue-500);
  box-shadow: var(--shadow-lg);
}

/* 推荐主力档位：樱华霞光高亮突出 */
.pricing-card.is-featured {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(255, 241, 242, 0.5) 100%);
  border: 2px solid var(--border-featured);
  box-shadow: var(--shadow-sakura);
}

.pricing-card.is-featured:hover {
  box-shadow: 0 20px 48px rgba(244, 63, 94, 0.32);
}

.featured-tag {
  position: absolute;
  top: -14px;
  left: 1.75rem;
  background: linear-gradient(135deg, var(--sakura-pink), #fb7185);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 800;
  font-family: var(--font-mono);
  padding: 0.25rem 0.85rem;
  border-radius: 9999px;
  box-shadow: 0 4px 12px rgba(244, 63, 94, 0.35);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.tier-name {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.35rem;
}

.tier-target {
  font-size: 0.8125rem;
  color: var(--text-light);
  margin-bottom: 1.5rem;
}

.tier-price-row {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
  margin-bottom: 1.75rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-glass);
}

.price-unit {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
}

.price-num {
  font-size: 2.75rem;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1;
  font-family: var(--font-mono);
}

.is-featured .price-num {
  background: linear-gradient(135deg, var(--text-main), var(--sakura-pink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.price-cycle {
  font-size: 0.875rem;
  color: var(--text-light);
}

.tier-features {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.tier-feature-item {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 0.875rem;
  color: var(--text-body);
}

.tier-feature-bullet {
  color: var(--sky-blue-600);
  font-weight: 800;
  font-size: 1.1rem;
}

.is-featured .tier-feature-bullet {
  color: var(--sakura-pink);
}

/* ================= 7. FAQ 常见问题 (手风琴) ================= */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

.faq-item {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.faq-item.is-open {
  border-color: var(--sky-blue-500);
  box-shadow: var(--shadow-md);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 1.25rem 1.5rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: transparent;
  transition: color 0.2s ease;
}

.faq-question:hover {
  color: var(--sky-blue-600);
}

.faq-icon {
  font-size: 1.4rem;
  color: var(--sky-blue-600);
  font-weight: 400;
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background-color: var(--sky-blue-100);
}

.faq-item.is-open .faq-icon {
  transform: rotate(45deg);
  background-color: var(--sakura-light);
  color: var(--sakura-pink);
}

.faq-answer {
  padding: 0 1.5rem 1.35rem;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-muted);
  border-top: 1px dashed rgba(186, 230, 253, 0.5);
  margin-top: 0.25rem;
  padding-top: 0.875rem;
}

/* ================= Final CTA 转化航标 ================= */
.final-cta-section {
  padding: 5.5rem 0;
  position: relative;
  text-align: center;
  background: linear-gradient(180deg, rgba(244, 249, 253, 0) 0%, rgba(224, 242, 254, 0.6) 100%);
}

.final-cta-container {
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
  background: var(--bg-glass-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 3rem 2rem;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(14px);
  position: relative;
  overflow: hidden;
}

.final-cta-container::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #0284c7, #f43f5e, #fbbf24);
}

.final-cta-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.875rem;
  letter-spacing: -0.02em;
}

.final-cta-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  line-height: 1.65;
}

/* ================= 移动端吸底 CTA ================= */
.mobile-sticky-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.96);
  border-top: 1px solid var(--border-glass);
  padding: 0.75rem 1.25rem;
  z-index: 99;
  box-shadow: 0 -4px 18px rgba(2, 132, 199, 0.1);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transform: translateY(100%);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.mobile-sticky-bar.is-visible {
  display: block;
  transform: translateY(0);
}

/* ================= 页脚 Footer ================= */
.site-footer {
  background-color: #ffffff;
  padding: 4rem 0 2.25rem;
  margin-top: auto;
  border-top: 1px solid var(--border-glass);
  position: relative;
  z-index: 2;
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.25rem;
  padding-bottom: 2.75rem;
  border-bottom: 1px solid var(--border-glass);
}

.footer-brand-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.625rem;
}

.footer-brand-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.65;
  max-width: 340px;
}

.footer-nav-group {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.footer-nav-heading {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.35rem;
}

.footer-link {
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color 0.15s ease, transform 0.15s ease;
}

.footer-link:hover {
  color: var(--sky-blue-600);
  transform: translateX(3px);
}

.footer-bottom {
  padding-top: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  font-size: 0.8125rem;
  color: var(--text-light);
}

/* ================= SEO 文章与合规页面样式 ================= */
.page-container {
  padding: 3.5rem 0 4.5rem;
  position: relative;
  z-index: 2;
}

.page-article {
  max-width: 840px;
  margin-left: auto;
  margin-right: auto;
  background: var(--bg-glass-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 2.25rem 1.75rem;
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(12px);
}

.article-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--text-light);
  margin-bottom: 1.5rem;
  font-family: var(--font-mono);
}

.article-breadcrumb a {
  color: var(--text-muted);
}

.article-breadcrumb a:hover {
  color: var(--sky-blue-600);
}

.article-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 0.875rem;
}

.article-meta {
  font-size: 0.8125rem;
  color: var(--text-light);
  margin-bottom: 1.75rem;
  padding-bottom: 1.15rem;
  border-bottom: 1px solid var(--border-glass);
  font-family: var(--font-mono);
}

.article-lead {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--text-main);
  background: linear-gradient(90deg, rgba(224, 242, 254, 0.7), rgba(255, 255, 255, 0.7));
  padding: 1.25rem 1.35rem;
  border-left: 4px solid var(--sky-blue-600);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 2.25rem;
}

.article-body h2 {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-main);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid var(--border-glass);
}

.article-body h3 {
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 1.65rem;
  margin-bottom: 0.625rem;
}

.article-body p {
  font-size: 0.975rem;
  line-height: 1.8;
  color: var(--text-body);
  margin-bottom: 1.35rem;
}

.article-body ul, .article-body ol {
  margin-bottom: 1.35rem;
  padding-left: 1.5rem;
}

.article-body ul li {
  list-style-type: disc;
  font-size: 0.95rem;
  color: var(--text-body);
  line-height: 1.75;
  margin-bottom: 0.45rem;
}

.article-body ol li {
  list-style-type: decimal;
  font-size: 0.95rem;
  color: var(--text-body);
  line-height: 1.75;
  margin-bottom: 0.45rem;
}

.article-table-wrap {
  overflow-x: auto;
  margin: 1.75rem 0;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  text-align: left;
}

.article-table th {
  background: var(--sky-blue-100);
  color: var(--text-main);
  font-weight: 700;
  padding: 0.875rem 1.15rem;
  border-bottom: 1px solid var(--border-glass);
}

.article-table td {
  padding: 0.875rem 1.15rem;
  color: var(--text-body);
  border-bottom: 1px solid var(--border-glass);
  background-color: #ffffff;
}

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

.article-faq-box {
  margin-top: 2.75rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border-glass);
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(224, 242, 254, 0.8) 0%, rgba(255, 241, 242, 0.6) 100%);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  margin-top: 2.75rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.article-cta-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.article-cta-desc {
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.article-rel-links {
  margin-top: 2.25rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border-glass);
}

.rel-links-heading {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.875rem;
}

.rel-links-list {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
  font-size: 0.9rem;
}

/* ================= 指南页文章列表 ================= */
.guides-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.65rem;
  margin-top: 2.25rem;
}

.guide-item-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 1.85rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.guide-item-card:hover {
  transform: translateY(-5px);
  border-color: var(--sky-blue-500);
  box-shadow: var(--shadow-md);
}

.guide-card-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.625rem;
}

.guide-card-title a {
  color: var(--text-main);
}

.guide-card-title a:hover {
  color: var(--sky-blue-600);
}

.guide-card-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

.guide-card-footer {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8125rem;
  color: var(--text-light);
  font-family: var(--font-mono);
  padding-top: 0.875rem;
  border-top: 1px dashed var(--border-glass);
}

/* ================= 媒体查询响应式 ================= */
@media (min-width: 640px) {
  .hero-meta-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .benefits-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .scenarios-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 900px) {
  .site-nav {
    display: block;
  }

  .menu-toggle {
    display: none;
  }

  .mobile-drawer {
    display: none !important;
  }

  .hero-layout {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 3.5rem;
  }

  .hero-title {
    font-size: 3rem;
  }

  .features-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .streaming-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .ai-support-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer-top {
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
  }

  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
  }

  .page-article {
    padding: 2.75rem 2.5rem;
  }

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

/* ================= 无障碍降级减弱动画 ================= */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .meteor-streak, #sakura-canvas {
    display: none !important;
  }
}