/* ==========================================================================
   气泡云 (BubbleCloud) - 现代化轻量级极速样式表 (Zero-Dependency)
   设计风格：现代暗黑科技风 + 霓虹气泡微光 + 全响应式单栏自适应
   ========================================================================== */

:root {
  --bg-primary: #080b11;
  --bg-secondary: #0f1523;
  --bg-card: rgba(18, 26, 43, 0.75);
  --bg-card-hover: rgba(28, 38, 62, 0.85);
  --bg-glass: rgba(13, 19, 33, 0.7);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(56, 189, 248, 0.35);
  --border-neon: rgba(129, 140, 248, 0.5);

  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --accent-cyan: #38bdf8;
  --accent-blue: #3b82f6;
  --accent-purple: #818cf8;
  --accent-pink: #f43f5e;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;

  --gradient-bubble: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #c084fc 100%);
  --gradient-btn: linear-gradient(135deg, #0284c7 0%, #6366f1 100%);
  --gradient-btn-hover: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
  --gradient-tag: linear-gradient(90deg, rgba(56, 189, 248, 0.15), rgba(129, 140, 248, 0.15));

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "Fira Code", Consolas, Monaco, "Courier New", monospace;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-pill: 9999px;
  --shadow-glow: 0 0 30px rgba(56, 189, 248, 0.2);
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* 科技感背景光晕效果 */
.bg-glow-top {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 1200px;
  height: 600px;
  background: radial-gradient(circle at 50% 15%, rgba(56, 189, 248, 0.15) 0%, rgba(99, 102, 241, 0.08) 45%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* 链接样式 */
a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

/* 按钮通用组件 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-btn);
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.35);
}

.btn-primary:hover {
  background: var(--gradient-btn-hover);
  box-shadow: 0 6px 28px rgba(56, 189, 248, 0.55);
  transform: translateY(-2px);
  color: #ffffff;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-main);
  border-color: var(--border-subtle);
  backdrop-filter: blur(8px);
}

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

.btn-lg {
  padding: 15px 36px;
  font-size: 1.1rem;
}

/* ==========================================================================
   导航栏 (Navbar)
   ========================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 72px;
  background: rgba(8, 11, 17, 0.6);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 1000;
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(8, 11, 17, 0.95);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.6);
  border-bottom-color: rgba(56, 189, 248, 0.2);
}

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

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.nav-brand-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient-bubble);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.5);
}

.nav-brand-text {
  background: var(--gradient-bubble);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.92rem;
  font-weight: 500;
}

.nav-links a:hover {
  color: var(--accent-cyan);
}

.nav-links .nav-highlight {
  color: #38bdf8;
  position: relative;
  font-weight: 600;
}

.nav-links .nav-highlight::after {
  content: "HOT";
  position: absolute;
  top: -10px;
  right: -24px;
  background: #f43f5e;
  color: #fff;
  font-size: 0.6rem;
  padding: 1px 5px;
  border-radius: 6px;
  font-weight: 700;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-btn-login {
  color: var(--text-muted);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
}

.nav-btn-login:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
}

.nav-burger {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.6rem;
  cursor: pointer;
  padding: 6px;
}

/* ==========================================================================
   首屏横幅区 (Hero Section)
   ========================================================================== */
.hero-section {
  padding-top: 150px;
  padding-bottom: 80px;
  text-align: center;
  position: relative;
}

.discount-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: var(--radius-pill);
  background: var(--gradient-tag);
  border: 1px solid var(--border-highlight);
  color: var(--accent-cyan);
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 24px;
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.15);
  animation: pulse-soft 3s infinite ease-in-out;
}

.discount-badge .badge-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-cyan);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-cyan);
}

.hero-title {
  font-size: clamp(2.3rem, 5.5vw, 4rem);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -1px;
  margin-bottom: 22px;
  color: #ffffff;
}

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

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  color: var(--text-muted);
  max-width: 780px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-trust {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  flex-wrap: wrap;
  color: var(--text-dim);
  font-size: 0.88rem;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.trust-item svg {
  color: var(--accent-emerald);
}

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

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 50px;
}

.section-tag {
  display: inline-block;
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  color: #ffffff;
}

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

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-bubble);
  opacity: 0;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-highlight);
  box-shadow: 0 15px 35px -10px rgba(56, 189, 248, 0.25);
  background: var(--bg-card-hover);
}

.feature-card:hover::before {
  opacity: 1;
}

.card-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: rgba(56, 189, 248, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  margin-bottom: 22px;
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.feature-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: #ffffff;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* 流媒体与 AI 支持图卡大卡片 */
.media-ai-card {
  background: linear-gradient(135deg, rgba(18, 26, 43, 0.85) 0%, rgba(30, 27, 75, 0.6) 100%);
  border: 1px solid var(--border-neon);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(12px);
}

.media-ai-content {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 36px;
  align-items: center;
}

.media-ai-text h3 {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: #ffffff;
}

.media-ai-text p {
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.65;
  margin-bottom: 20px;
}

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

.pill-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-subtle);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  color: var(--text-main);
  font-weight: 500;
}

.media-ai-badges {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.badge-box {
  background: rgba(13, 19, 33, 0.7);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 18px;
  transition: var(--transition);
}

.badge-box:hover {
  border-color: var(--accent-cyan);
  background: rgba(20, 29, 50, 0.9);
}

.badge-box-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
  font-weight: 700;
  color: #ffffff;
  font-size: 0.95rem;
}

.badge-box p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0;
}

/* ==========================================================================
   定价卡片区 (Pricing Section)
   ========================================================================== */
.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-subtle);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-highlight);
  box-shadow: 0 20px 40px -15px rgba(56, 189, 248, 0.3);
}

.pricing-card.popular {
  border-color: var(--accent-purple);
  background: linear-gradient(180deg, rgba(28, 32, 60, 0.85) 0%, rgba(18, 26, 43, 0.85) 100%);
  box-shadow: 0 0 35px rgba(129, 140, 248, 0.25);
  transform: scale(1.03);
  z-index: 2;
}

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

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-bubble);
  color: #080b11;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.4);
  letter-spacing: 0.5px;
}

.plan-header {
  text-align: center;
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.plan-name {
  font-size: 1.4rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 6px;
}

.plan-subtitle {
  color: var(--text-dim);
  font-size: 0.85rem;
}

.plan-price {
  margin: 18px 0 6px;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}

.price-currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.price-amount {
  font-size: 3rem;
  font-weight: 900;
  color: #ffffff;
  line-height: 1;
}

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

.plan-traffic-highlight {
  display: inline-block;
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-cyan);
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.88rem;
  font-weight: 700;
  margin-top: 8px;
}

.plan-features {
  list-style: none;
  margin-bottom: 30px;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.plan-features li svg {
  color: var(--accent-emerald);
  flex-shrink: 0;
}

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

/* ==========================================================================
   深度特性解析区 (Why Choose Section)
   ========================================================================== */
.why-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 70px;
}

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

.why-row.reverse {
  grid-template-columns: 1fr 1fr;
}

.why-text h3 {
  font-size: clamp(1.5rem, 2.5vw, 2.1rem);
  font-weight: 800;
  margin-bottom: 16px;
  color: #ffffff;
  line-height: 1.3;
}

.why-text p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 24px;
}

.why-highlights {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.why-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.why-item svg {
  color: var(--accent-cyan);
  margin-top: 4px;
  flex-shrink: 0;
}

.why-item-title {
  font-weight: 700;
  color: #ffffff;
  font-size: 0.95rem;
}

.why-item-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* 动态数据面板视觉组件 (Dashboard Panel) */
.dashboard-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: 0 0 35px rgba(56, 189, 248, 0.15);
  backdrop-filter: blur(12px);
}

.dash-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 14px;
  margin-bottom: 18px;
}

.dash-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 8px;
}

.dash-status-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-emerald);
}

.dash-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 20px;
}

.stat-box {
  background: rgba(13, 19, 33, 0.85);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px;
  text-align: center;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.stat-value {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--accent-cyan);
  line-height: 1.1;
}

.stat-sub {
  font-size: 0.7rem;
  color: var(--accent-emerald);
  margin-top: 2px;
}

/* 吞吐量波浪示意进度条 */
.bandwidth-meter {
  background: rgba(13, 19, 33, 0.85);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px;
}

.meter-title {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.meter-bar-bg {
  width: 100%;
  height: 8px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}

.meter-bar-fill {
  width: 94%;
  height: 100%;
  background: var(--gradient-bubble);
  border-radius: 4px;
  box-shadow: 0 0 10px var(--accent-cyan);
}

/* 终端代码块视觉组件 (Terminal Code Block) */
.terminal-card {
  background: #090d16;
  border: 1px solid var(--border-neon);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 0 35px rgba(129, 140, 248, 0.2);
  font-family: var(--font-mono);
}

.terminal-header {
  background: #111726;
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.terminal-dots {
  display: flex;
  gap: 7px;
}

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

.dot-red { background: #ef4444; }
.dot-yellow { background: #f59e0b; }
.dot-green { background: #10b981; }

.terminal-file {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.terminal-body {
  padding: 20px;
  font-size: 0.86rem;
  line-height: 1.7;
  color: #cbd5e1;
}

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

.t-cmd {
  color: #38bdf8;
  font-weight: 600;
}

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

.t-success {
  color: #34d399;
}

.t-highlight {
  color: #fbbf24;
}

.terminal-cursor {
  display: inline-block;
  width: 8px;
  height: 14px;
  background: var(--accent-cyan);
  margin-left: 4px;
  animation: blink 1s step-end infinite;
}

/* ==========================================================================
   用户评价跑马灯区 (Testimonials Marquee Section)
   ========================================================================== */
.marquee-container {
  overflow: hidden;
  width: 100%;
  position: relative;
  padding: 20px 0;
  mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
}

.marquee-track {
  display: flex;
  gap: 24px;
  width: max-content;
  animation: marquee-scroll 36s linear infinite;
}

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

.testimonial-card {
  width: 340px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  backdrop-filter: blur(10px);
  flex-shrink: 0;
  transition: var(--transition);
}

.testimonial-card:hover {
  border-color: var(--border-highlight);
  transform: translateY(-4px);
}

.rating-stars {
  color: #f59e0b;
  font-size: 1rem;
  margin-bottom: 12px;
  display: flex;
  gap: 2px;
}

.testimonial-comment {
  font-size: 0.92rem;
  color: var(--text-main);
  line-height: 1.6;
  margin-bottom: 16px;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient-bubble);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #080b11;
  font-size: 0.95rem;
}

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

.author-info span {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* ==========================================================================
   常见问题解答区 (FAQ Section) - HTML5 原生 details/summary 手风琴
   ========================================================================== */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

details.faq-item[open] {
  border-color: var(--border-highlight);
  background: var(--bg-card-hover);
}

summary.faq-question {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  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;
}

summary.faq-question::after {
  content: "+";
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--accent-cyan);
  transition: transform 0.25s ease;
}

details[open] summary.faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 24px 22px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  margin-top: 4px;
  padding-top: 16px;
}

/* ==========================================================================
   底部二次行动呼吁区 (Bottom CTA Section)
   ========================================================================== */
.bottom-cta-box {
  background: radial-gradient(circle at 50% 0%, rgba(56, 189, 248, 0.22) 0%, rgba(18, 26, 43, 0.95) 70%);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  padding: 60px 30px;
  text-align: center;
  box-shadow: 0 0 50px rgba(56, 189, 248, 0.15);
  margin-bottom: 40px;
}

.bottom-cta-box h2 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  margin-bottom: 16px;
  color: #ffffff;
}

.bottom-cta-box p {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 650px;
  margin: 0 auto 32px;
}

/* ==========================================================================
   页脚 (Footer) - 精准保留四个外链单页入口
   ========================================================================== */
.footer {
  border-top: 1px solid var(--border-subtle);
  background: #05070c;
  padding: 48px 0 32px;
  margin-top: 60px;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 36px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.footer-nav a {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
}

.footer-nav a:hover {
  color: var(--accent-cyan);
}

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

/* ==========================================================================
   内页专用样式 (Articles, About, Terms, Privacy)
   ========================================================================== */
.inner-header {
  padding-top: 130px;
  padding-bottom: 40px;
  text-align: center;
}

.inner-content {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 48px;
  margin-bottom: 70px;
  line-height: 1.8;
  color: var(--text-main);
  backdrop-filter: blur(12px);
}

.inner-content h2 {
  font-size: 1.8rem;
  margin-top: 36px;
  margin-bottom: 16px;
  color: #ffffff;
  border-left: 4px solid var(--accent-cyan);
  padding-left: 14px;
}

.inner-content h3 {
  font-size: 1.35rem;
  margin-top: 26px;
  margin-bottom: 12px;
  color: #e2e8f0;
}

.inner-content p {
  margin-bottom: 16px;
  color: #cbd5e1;
}

.inner-content ul, .inner-content ol {
  margin-left: 24px;
  margin-bottom: 20px;
  color: #cbd5e1;
}

.inner-content li {
  margin-bottom: 8px;
}

.article-card-box {
  background: rgba(13, 19, 33, 0.8);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 30px;
  margin-bottom: 36px;
  transition: var(--transition);
}

.article-card-box:hover {
  border-color: var(--border-highlight);
  box-shadow: 0 10px 30px rgba(56, 189, 248, 0.15);
}

.article-meta {
  display: flex;
  gap: 16px;
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.article-dofollow-link {
  color: var(--accent-cyan);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.article-dofollow-link:hover {
  color: #ffffff;
}

/* ==========================================================================
   动画与关键帧 (Keyframes)
   ========================================================================== */
@keyframes marquee-scroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

@keyframes pulse-soft {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.02); }
}

/* ==========================================================================
   响应式媒体查询 (Mobile Responsive)
   ========================================================================== */
@media (max-width: 992px) {
  .features-grid,
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 550px;
    margin-left: auto;
    margin-right: auto;
  }

  .pricing-card.popular {
    transform: none;
  }

  .pricing-card.popular:hover {
    transform: translateY(-6px);
  }

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

  .why-row,
  .why-row.reverse {
    grid-template-columns: 1fr;
    gap: 36px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(8, 11, 17, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 30px 24px;
    border-bottom: 1px solid var(--border-subtle);
    gap: 20px;
    display: none;
  }

  .nav-links.active {
    display: flex;
  }

  .nav-burger {
    display: block;
  }

  .nav-actions .btn {
    padding: 8px 16px;
    font-size: 0.88rem;
  }

  .hero-section {
    padding-top: 120px;
    padding-bottom: 50px;
  }

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

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

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

  .dash-stats-grid {
    grid-template-columns: 1fr;
  }

  .inner-content {
    padding: 24px 18px;
  }

  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }
}