/* ==========================================================================
   气泡云 (Bubble Cloud) - 官方极简原生CSS样式表
   零重型依赖 · 纯原生手写 · 极致秒开与卓越交互体验
   ========================================================================== */

:root {
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "Fira Code", Consolas, Monaco, "Courier New", monospace;
  
  /* 品牌色彩系统 */
  --bg-primary: #07090e;
  --bg-secondary: #0d121d;
  --bg-card: rgba(18, 24, 38, 0.75);
  --bg-card-hover: rgba(28, 38, 60, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(0, 242, 254, 0.4);
  
  --primary-cyan: #00f2fe;
  --primary-blue: #4facfe;
  --accent-purple: #9d4edd;
  --accent-glow: rgba(0, 242, 254, 0.25);
  --gradient-brand: linear-gradient(135deg, #00f2fe 0%, #4facfe 50%, #9d4edd 100%);
  --gradient-btn: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
  --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 0.04) 0%, rgba(255, 255, 255, 0.01) 100%);

  /* 文字颜色 */
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dark: #64748b;
  --text-cyan: #38bdf8;
  
  /* 阴影与过渡 */
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 12px 36px rgba(0, 0, 0, 0.5), 0 0 24px rgba(0, 242, 254, 0.15);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --container-width: 1200px;
}

/* 全局重置与基础规范 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  position: relative;
  overflow-x: hidden;
  background: radial-gradient(circle at 50% 0%, rgba(0, 242, 254, 0.08) 0%, transparent 60%),
              radial-gradient(circle at 85% 30%, rgba(157, 78, 221, 0.06) 0%, transparent 50%),
              radial-gradient(circle at 15% 70%, rgba(79, 172, 254, 0.06) 0%, transparent 50%),
              var(--bg-primary);
  min-height: 100vh;
}

/* 通用容器与排版 */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

ul, ol {
  list-style: none;
}

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

.text-gradient {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

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

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary-cyan);
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid rgba(0, 242, 254, 0.25);
  border-radius: var(--radius-full);
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
  color: #fff;
}

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

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  border: none;
  outline: none;
  transition: var(--transition);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-btn);
  color: #040914;
  font-weight: 700;
  box-shadow: 0 4px 18px rgba(0, 242, 254, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0, 242, 254, 0.55);
  filter: brightness(1.08);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
  border: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 15px 36px;
  font-size: 1.05rem;
}

/* ==========================================================================
   导航栏 (Navbar)
   ========================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 72px;
  z-index: 1000;
  transition: var(--transition);
  background: rgba(7, 9, 14, 0.65);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.navbar.scrolled {
  background: rgba(7, 9, 14, 0.92);
  border-bottom: 1px solid rgba(0, 242, 254, 0.15);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* 品牌 Logo */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.5px;
}

.logo-bubble-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--gradient-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 14px var(--accent-glow);
}

.logo-bubble-icon svg {
  width: 22px;
  height: 22px;
  fill: #07090e;
}

/* 导航链接 */
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  color: var(--text-muted);
  font-size: 0.92rem;
  font-weight: 500;
  position: relative;
  padding: 6px 0;
}

.nav-link:hover,
.nav-link.active {
  color: #fff;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--primary-cyan);
  transition: var(--transition);
  border-radius: 2px;
}

.nav-link:hover::after {
  width: 100%;
}

.nav-link.highlight {
  color: var(--primary-cyan);
  font-weight: 600;
}

/* 导航右侧动作按钮 */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.mobile-menu-btn {
  display: none;
  background: transparent;
  border: none;
  color: #fff;
  cursor: pointer;
  padding: 6px;
}

.mobile-menu-btn svg {
  width: 26px;
  height: 26px;
  stroke: currentColor;
}

/* ==========================================================================
   首屏横幅区 (Hero Section)
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 160px 0 100px 0;
  text-align: center;
  overflow: hidden;
}

.hero-glow-sphere {
  position: absolute;
  top: 15%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 350px;
  background: radial-gradient(circle, rgba(0, 242, 254, 0.16) 0%, rgba(157, 78, 221, 0.08) 50%, transparent 80%);
  filter: blur(80px);
  z-index: -1;
  pointer-events: none;
}

.promo-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid rgba(0, 242, 254, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary-cyan);
  margin-bottom: 24px;
  box-shadow: 0 0 20px rgba(0, 242, 254, 0.15);
  animation: pulse-glow 3s infinite ease-in-out;
}

@keyframes pulse-glow {
  0%, 100% { border-color: rgba(0, 242, 254, 0.3); box-shadow: 0 0 15px rgba(0, 242, 254, 0.15); }
  50% { border-color: rgba(0, 242, 254, 0.7); box-shadow: 0 0 25px rgba(0, 242, 254, 0.35); }
}

.hero-title {
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-muted);
  max-width: 820px;
  margin: 0 auto 38px auto;
  line-height: 1.7;
}

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

.hero-trust-badges {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  color: var(--text-dark);
  font-size: 0.88rem;
  font-weight: 500;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
}

.trust-item svg {
  width: 18px;
  height: 18px;
  color: var(--primary-cyan);
}

/* ==========================================================================
   核心优势图卡区 (Dynamic Cards Section)
   ========================================================================== */
.features-section {
  padding: 80px 0;
  position: relative;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 32px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(12px);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
}

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

.card-icon {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid rgba(0, 242, 254, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--primary-cyan);
}

.card-icon svg {
  width: 28px;
  height: 28px;
}

.card-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}

.card-text {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* 流媒体与AI支持大卡片 */
.media-ai-card {
  background: linear-gradient(135deg, rgba(20, 28, 48, 0.8) 0%, rgba(13, 18, 29, 0.95) 100%);
  border: 1px solid rgba(0, 242, 254, 0.2);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 40px;
  align-items: center;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(14px);
}

.media-ai-content h3 {
  font-size: 1.6rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 14px;
}

.media-ai-content p {
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 24px;
}

.media-tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.media-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: #e2e8f0;
}

.media-badge.cyan {
  border-color: rgba(0, 242, 254, 0.3);
  color: var(--primary-cyan);
  background: rgba(0, 242, 254, 0.06);
}

.media-badge.purple {
  border-color: rgba(157, 78, 221, 0.3);
  color: #c084fc;
  background: rgba(157, 78, 221, 0.06);
}

.media-ai-visual {
  background: rgba(9, 13, 22, 0.85);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.metric-box {
  padding: 16px;
  background: rgba(255, 255, 255, 0.02);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.metric-title {
  font-size: 0.82rem;
  color: var(--text-dark);
  margin-bottom: 6px;
}

.metric-val {
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
  font-family: var(--font-mono);
}

.metric-val.green { color: #10b981; }
.metric-val.cyan { color: var(--primary-cyan); }
.metric-val.purple { color: #a855f7; }
.metric-val.amber { color: #f59e0b; }

/* ==========================================================================
   定价卡片区 (Pricing Section)
   ========================================================================== */
.pricing-section {
  padding: 100px 0;
  position: relative;
}

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

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
  backdrop-filter: blur(12px);
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: rgba(0, 242, 254, 0.35);
  box-shadow: var(--shadow-lg);
}

/* 推荐套餐高亮 */
.pricing-card.featured {
  background: linear-gradient(180deg, rgba(22, 33, 56, 0.95) 0%, rgba(13, 18, 30, 0.9) 100%);
  border: 2px solid var(--primary-cyan);
  box-shadow: 0 0 35px rgba(0, 242, 254, 0.25);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-8px);
  box-shadow: 0 0 45px rgba(0, 242, 254, 0.4);
}

.recommend-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-btn);
  color: #040914;
  font-size: 0.8rem;
  font-weight: 800;
  padding: 4px 18px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  box-shadow: 0 4px 14px rgba(0, 242, 254, 0.4);
}

.plan-header {
  margin-bottom: 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 24px;
}

.plan-name {
  font-size: 1.4rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.plan-price-wrapper {
  margin-bottom: 28px;
}

.plan-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

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

.price-number {
  font-size: 2.8rem;
  font-weight: 800;
  color: #fff;
  line-height: 1;
}

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

.plan-data-tag {
  display: inline-block;
  margin-top: 10px;
  font-size: 0.85rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 6px;
  background: rgba(0, 242, 254, 0.1);
  color: var(--primary-cyan);
}

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

.plan-features li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 14px;
  font-size: 0.93rem;
  color: #cbd5e1;
}

.plan-features li svg {
  width: 18px;
  height: 18px;
  color: var(--primary-cyan);
  flex-shrink: 0;
  margin-top: 3px;
}

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

/* ==========================================================================
   深度特性解析区 (Why Choose Section)
   ========================================================================== */
.why-choose-section {
  padding: 90px 0;
  position: relative;
}

.why-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 80px;
}

.why-row:last-child {
  margin-bottom: 0;
}

.why-row.reverse {
  direction: rtl;
}

.why-row.reverse > * {
  direction: ltr;
}

.why-info h3 {
  font-size: clamp(1.6rem, 2.8vw, 2.2rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 18px;
  line-height: 1.3;
}

.why-info p {
  font-size: 1.02rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 24px;
}

.why-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.why-list-item {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #e2e8f0;
  font-size: 0.95rem;
}

.why-list-item svg {
  width: 20px;
  height: 20px;
  color: var(--primary-cyan);
  flex-shrink: 0;
}

/* 动态数据面板 */
.data-panel-card {
  background: rgba(13, 19, 32, 0.9);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--shadow-sm);
  position: relative;
}

.data-panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.data-panel-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 8px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 10px #10b981;
}

.data-stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.data-stat-box {
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-md);
  padding: 20px 16px;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.stat-label {
  font-size: 0.82rem;
  color: var(--text-dark);
  margin-bottom: 6px;
}

.stat-value {
  font-size: 1.6rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: #fff;
}

.stat-value.cyan { color: var(--primary-cyan); }
.stat-value.green { color: #10b981; }

/* 极客终端代码窗口 */
.terminal-window {
  background: #090d16;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  font-family: var(--font-mono);
}

.terminal-header {
  background: #111726;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.terminal-buttons {
  display: flex;
  gap: 6px;
}

.t-btn {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}

.t-close { background: #ef4444; }
.t-min { background: #f59e0b; }
.t-max { background: #10b981; }

.terminal-title {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.terminal-body {
  padding: 20px;
  font-size: 0.88rem;
  line-height: 1.7;
  color: #e2e8f0;
}

.t-prompt {
  color: var(--primary-cyan);
}

.t-cmd {
  color: #fff;
  font-weight: 600;
}

.t-comment {
  color: #64748b;
  font-style: italic;
}

.t-success {
  color: #10b981;
}

.t-highlight {
  color: #facc15;
}

/* ==========================================================================
   用户评价跑马灯区 (Testimonials Marquee Section)
   ========================================================================== */
.testimonials-section {
  padding: 90px 0;
  position: relative;
  overflow: hidden;
}

.marquee-container {
  width: 100%;
  overflow: hidden;
  position: relative;
  mask-image: linear-gradient(to right, transparent, #000 10%, #000 90%, transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, #000 10%, #000 90%, transparent);
}

.marquee-track {
  display: flex;
  width: max-content;
  gap: 24px;
  animation: marquee-scroll 45s linear infinite;
}

.marquee-track:hover {
  animation-play-state: paused;
}

@keyframes marquee-scroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(calc(-50% - 12px)); }
}

.review-card {
  width: 360px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  backdrop-filter: blur(10px);
  flex-shrink: 0;
  transition: var(--transition);
}

.review-card:hover {
  border-color: rgba(0, 242, 254, 0.4);
  background: var(--bg-card-hover);
}

.review-stars {
  display: flex;
  gap: 4px;
  color: #facc15;
  margin-bottom: 14px;
}

.review-stars svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.review-text {
  font-size: 0.92rem;
  color: #cbd5e1;
  line-height: 1.6;
  margin-bottom: 18px;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #040914;
  font-size: 0.95rem;
}

.user-info h4 {
  font-size: 0.92rem;
  font-weight: 700;
  color: #fff;
}

.user-info span {
  font-size: 0.8rem;
  color: var(--text-dark);
}

/* ==========================================================================
   常见问题解答区 (FAQ Section)
   ========================================================================== */
.faq-section {
  padding: 90px 0;
  position: relative;
}

.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

details.faq-item:hover {
  border-color: rgba(0, 242, 254, 0.3);
}

details.faq-item[open] {
  border-color: rgba(0, 242, 254, 0.45);
  background: var(--bg-card-hover);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

summary.faq-question {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

.faq-icon-arrow {
  width: 20px;
  height: 20px;
  color: var(--primary-cyan);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

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

.faq-answer {
  padding: 0 24px 22px 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.75;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  margin-top: -4px;
  padding-top: 16px;
}

/* ==========================================================================
   底部转化区 (CTA Section)
   ========================================================================== */
.cta-section {
  padding: 90px 0 120px 0;
  position: relative;
}

.cta-box {
  background: radial-gradient(circle at 50% 50%, rgba(0, 242, 254, 0.12) 0%, rgba(13, 18, 29, 0.95) 100%);
  border: 1px solid rgba(0, 242, 254, 0.25);
  border-radius: var(--radius-lg);
  padding: 64px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.6);
}

.cta-box::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 500px;
  height: 250px;
  background: var(--gradient-brand);
  opacity: 0.15;
  filter: blur(70px);
  pointer-events: none;
}

.cta-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 18px;
}

.cta-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto 36px auto;
  line-height: 1.7;
}

.cta-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ==========================================================================
   页脚 (Footer)
   ========================================================================== */
.footer {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 48px 0 36px 0;
  background: #040609;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
}

.footer-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  flex-wrap: wrap;
}

.footer-link {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
}

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

.footer-copyright {
  font-size: 0.85rem;
  color: var(--text-dark);
  text-align: center;
}

/* ==========================================================================
   移动端抽屉导航 (Mobile Drawer Navigation)
   ========================================================================== */
.mobile-nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: rgba(4, 7, 13, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 999;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 40px 24px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.mobile-nav-overlay.active {
  opacity: 1;
  visibility: visible;
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  margin-bottom: 36px;
}

.mobile-nav-link {
  font-size: 1.3rem;
  font-weight: 600;
  color: #cbd5e1;
}

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

.mobile-nav-actions {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 280px;
  gap: 14px;
}

/* ==========================================================================
   响应式媒体查询 (Responsive Media Queries)
   ========================================================================== */
@media (max-width: 1024px) {
  .features-grid,
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-card.featured {
    transform: none;
  }
  
  .pricing-card.featured:hover {
    transform: translateY(-8px);
  }

  .media-ai-card {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

@media (max-width: 768px) {
  .nav-links,
  .nav-actions .btn-sm {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }

  .hero-section {
    padding: 130px 0 70px 0;
  }

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

  .why-row {
    grid-template-columns: 1fr;
    gap: 32px;
    margin-bottom: 60px;
  }

  .why-row.reverse {
    direction: ltr;
  }

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

  .footer-links {
    gap: 20px;
  }

  .hero-trust-badges {
    gap: 16px;
  }

  .btn-lg {
    width: 100%;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }

  .hero-cta-group .btn {
    width: 100%;
  }

  .cta-box {
    padding: 44px 20px;
  }

  .cta-actions {
    flex-direction: column;
    width: 100%;
  }

  .cta-actions .btn {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 18px;
  }

  .section-title {
    font-size: 1.65rem;
  }

  .hero-title {
    font-size: 2.1rem;
  }

  .promo-badge {
    font-size: 0.8rem;
    padding: 6px 14px;
  }

  .card {
    padding: 24px 20px;
  }

  .pricing-card {
    padding: 30px 20px;
  }

  .price-number {
    font-size: 2.4rem;
  }

  .terminal-body {
    padding: 14px;
    font-size: 0.8rem;
  }
}