/* ===================================================================
   影子 (YingZi) 网络加速落地页 - 原生 CSS 极简高性能样式表
   零外部依赖 | 秒开级加载性能 | 响应式全端适配
   =================================================================== */

:root {
  --bg-main: #0a0d14;
  --bg-card: rgba(18, 24, 38, 0.85);
  --bg-card-hover: rgba(26, 34, 53, 0.95);
  --bg-glass: rgba(10, 13, 20, 0.8);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(99, 102, 241, 0.35);
  --border-highlight: rgba(6, 182, 212, 0.4);
  
  --primary: #4f46e5;
  --primary-glow: #6366f1;
  --primary-hover: #4338ca;
  --accent: #06b6d4;
  --accent-green: #10b981;
  --accent-orange: #f59e0b;
  --accent-pink: #ec4899;

  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;
  --text-light: #ffffff;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 30px -10px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.35);
  --shadow-cyan: 0 0 25px rgba(6, 182, 212, 0.3);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  scroll-behavior: smooth;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background: radial-gradient(circle at 50% 0%, #151b2e 0%, #0a0d14 65%);
  min-height: 100vh;
  overflow-x: hidden;
}

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* 布局容器 */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-wrapper {
  padding: 90px 0;
  position: relative;
}

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

.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent);
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.25);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
}

.section-heading {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-light);
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}

.section-subheading {
  font-size: 17px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 15px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
  color: #ffffff;
  box-shadow: 0 4px 18px rgba(79, 70, 229, 0.4);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #4f46e5 0%, #4338ca 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(79, 70, 229, 0.55);
}

.btn-accent {
  background: linear-gradient(135deg, #06b6d4 0%, #0284c7 100%);
  color: #ffffff;
  box-shadow: 0 4px 18px rgba(6, 182, 212, 0.4);
}

.btn-accent:hover {
  background: linear-gradient(135deg, #0891b2 0%, #0369a1 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(6, 182, 212, 0.55);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.25);
  color: var(--text-light);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 15px 34px;
  font-size: 17px;
  border-radius: var(--radius-lg);
}

/* ================= 导航栏 (Navbar) ================= */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 13, 20, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 800;
  color: var(--text-light);
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, #6366f1 0%, #06b6d4 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 15px rgba(99, 102, 241, 0.4);
  overflow: hidden;
}

.brand-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 8px;
  display: block;
}

.brand-icon svg {
  width: 22px;
  height: 22px;
  fill: #ffffff;
}

.brand-text {
  letter-spacing: -0.5px;
}

.brand-domain {
  font-size: 12px;
  font-weight: 500;
  color: var(--accent);
  background: rgba(6, 182, 212, 0.1);
  padding: 2px 7px;
  border-radius: 4px;
  border: 1px solid rgba(6, 182, 212, 0.2);
  margin-left: 4px;
}

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

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
}

.nav-links a:hover {
  color: var(--text-light);
}

.nav-badge-news {
  font-size: 11px;
  background: linear-gradient(135deg, #ef4444, #f97316);
  color: #fff;
  padding: 2px 6px;
  border-radius: var(--radius-full);
  margin-left: 4px;
  font-weight: 700;
}

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

.nav-actions .btn {
  padding: 8px 18px;
  font-size: 14px;
}

/* 移动端汉堡菜单按钮 */
.menu-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--text-light);
}

.menu-toggle svg {
  width: 26px;
  height: 26px;
  fill: currentColor;
}

/* ================= 首屏横幅区 (Hero Section) ================= */
.hero-section {
  padding-top: 150px;
  padding-bottom: 90px;
  position: relative;
  text-align: center;
  overflow: hidden;
}

.hero-glow-bg {
  position: absolute;
  top: 10%;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 350px;
  background: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.25) 0%, rgba(6, 182, 212, 0.1) 45%, transparent 70%);
  filter: blur(60px);
  z-index: 0;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 880px;
  margin: 0 auto;
}

.discount-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: var(--radius-full);
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.35);
  color: #fbbf24;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 24px;
  box-shadow: 0 0 20px rgba(245, 158, 11, 0.2);
  animation: pulse-border 2.5s infinite;
}

@keyframes pulse-border {
  0%, 100% {
    box-shadow: 0 0 15px rgba(245, 158, 11, 0.2);
    border-color: rgba(245, 158, 11, 0.35);
  }
  50% {
    box-shadow: 0 0 25px rgba(245, 158, 11, 0.45);
    border-color: rgba(245, 158, 11, 0.7);
  }
}

.hero-title {
  font-size: 52px;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -1.2px;
  color: var(--text-light);
  margin-bottom: 22px;
}

.hero-title .brand-gradient {
  background: linear-gradient(135deg, #a5b4fc 0%, #38bdf8 50%, #34d399 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 20px;
  line-height: 1.65;
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto 36px auto;
}

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

.hero-stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 860px;
  margin: 0 auto;
  padding: 20px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-val {
  font-size: 26px;
  font-weight: 800;
  color: var(--text-light);
  font-family: var(--font-mono);
}

.stat-val span {
  color: var(--accent);
  font-size: 16px;
  margin-left: 2px;
}

.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ================= 核心优势图卡区 (Dynamic Cards) ================= */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 36px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary-glow), transparent);
  opacity: 0;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
}

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

.feature-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: var(--primary-glow);
}

.feature-icon-box svg {
  width: 26px;
  height: 26px;
}

.feature-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-light);
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 流媒体与 AI 支持大图卡 */
.media-ai-card {
  background: linear-gradient(135deg, rgba(22, 28, 45, 0.9) 0%, rgba(15, 23, 42, 0.95) 100%);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.media-ai-card::after {
  content: "";
  position: absolute;
  right: -50px;
  bottom: -50px;
  width: 240px;
  height: 240px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.media-ai-text h3 {
  font-size: 26px;
  font-weight: 800;
  color: var(--text-light);
  margin-bottom: 14px;
}

.media-ai-text p {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 20px;
}

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

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-main);
}

.badge-tag.highlight-ai {
  background: rgba(16, 185, 129, 0.1);
  border-color: rgba(16, 185, 129, 0.3);
  color: #34d399;
}

.badge-tag.highlight-media {
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.3);
  color: #f87171;
}

.media-visual-showcase {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.showcase-item {
  background: rgba(10, 13, 20, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: left;
}

.showcase-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.showcase-name {
  font-weight: 700;
  font-size: 14px;
  color: var(--text-light);
}

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

.showcase-sub {
  font-size: 12px;
  color: var(--text-dim);
}

/* ================= 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: 36px 30px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: rgba(99, 102, 241, 0.4);
  box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
  background: linear-gradient(180deg, rgba(30, 38, 60, 0.95) 0%, rgba(18, 24, 38, 0.95) 100%);
  border: 2px solid var(--primary-glow);
  box-shadow: 0 10px 40px -10px rgba(99, 102, 241, 0.35);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-8px);
}

.ribbon-recommended {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, #6366f1, #06b6d4);
  color: #ffffff;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.5px;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.5);
  text-transform: uppercase;
}

.plan-header {
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 22px;
  margin-bottom: 22px;
}

.plan-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-light);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.plan-tag {
  font-size: 12px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--accent);
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-top: 14px;
}

.currency {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-light);
}

.price-num {
  font-size: 44px;
  font-weight: 900;
  color: var(--text-light);
  line-height: 1;
  font-family: var(--font-mono);
}

.price-period {
  font-size: 14px;
  color: var(--text-muted);
}

.plan-traffic-highlight {
  margin-top: 12px;
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: #38bdf8;
  background: rgba(56, 189, 248, 0.1);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(56, 189, 248, 0.2);
}

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

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

.plan-features-list li svg {
  width: 18px;
  height: 18px;
  min-width: 18px;
  color: var(--accent-green);
  margin-top: 2px;
}

.plan-cta {
  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: 60px;
}

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

.why-text h3 {
  font-size: 30px;
  font-weight: 800;
  color: var(--text-light);
  line-height: 1.3;
  margin-bottom: 16px;
}

.why-text p {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 22px;
}

.bullet-features {
  list-style: none;
}

.bullet-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  color: var(--text-main);
  margin-bottom: 12px;
}

.bullet-features li svg {
  width: 18px;
  height: 18px;
  color: var(--accent);
}

/* 动态数据面板 */
.data-panel-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.data-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 20px;
}

.panel-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-light);
  display: flex;
  align-items: center;
  gap: 8px;
}

.live-indicator {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--accent-green);
  font-weight: 600;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-green);
  border-radius: 50%;
  animation: live-pulse 1.5s infinite;
}

@keyframes live-pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.speed-gauges-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 20px;
}

.gauge-box {
  background: rgba(10, 13, 20, 0.7);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 18px;
}

.gauge-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.gauge-number {
  font-size: 26px;
  font-weight: 800;
  color: var(--text-light);
  font-family: var(--font-mono);
}

.gauge-number span {
  font-size: 14px;
  color: var(--accent);
}

.progress-bar-wrap {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  margin-top: 10px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #6366f1, #06b6d4);
  border-radius: var(--radius-full);
}

.network-ping-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--text-muted);
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.network-ping-row strong {
  color: var(--accent-green);
  font-family: var(--font-mono);
}

/* 终端代码块 (Terminal) */
.terminal-window {
  background: #090c12;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.7);
  overflow: hidden;
  font-family: var(--font-mono);
}

.terminal-header {
  background: #151a24;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

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

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

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

.terminal-title {
  font-size: 12px;
  color: var(--text-muted);
  margin-left: 8px;
}

.terminal-body {
  padding: 20px;
  font-size: 13px;
  line-height: 1.7;
  color: #a7f3d0;
}

.term-line {
  margin-bottom: 6px;
  word-break: break-all;
}

.term-comment { color: #6b7280; }
.term-cyan { color: #38bdf8; }
.term-green { color: #34d399; }
.term-yellow { color: #fbbf24; }
.term-white { color: #ffffff; }

/* ================= 跑马灯评价区 (Testimonials Marquee) ================= */
.marquee-container {
  overflow: hidden;
  position: relative;
  width: 100%;
  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: 20px;
  width: max-content;
  animation: marquee-scroll 32s linear infinite;
}

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

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

.review-card {
  width: 340px;
  flex-shrink: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 22px;
  transition: var(--transition);
}

.review-card:hover {
  border-color: rgba(99, 102, 241, 0.4);
  transform: translateY(-3px);
}

.review-stars {
  color: #fbbf24;
  font-size: 14px;
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.review-comment {
  font-size: 14px;
  color: var(--text-main);
  line-height: 1.6;
  margin-bottom: 16px;
}

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

.author-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, #4f46e5, #06b6d4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  color: #ffffff;
}

.author-info h4 {
  font-size: 14px;
  color: var(--text-light);
  font-weight: 600;
}

.author-info p {
  font-size: 12px;
  color: var(--text-dim);
}

/* ================= 常见问题区 (FAQ Section) ================= */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

.faq-item[open] {
  border-color: var(--border-glow);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.faq-summary {
  padding: 18px 22px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-light);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  list-style: none;
  user-select: none;
}

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

.faq-summary::after {
  content: "+";
  font-size: 22px;
  font-weight: 400;
  color: var(--accent);
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-summary::after {
  content: "−";
  color: var(--primary-glow);
}

.faq-content {
  padding: 0 22px 20px 22px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 16px;
}

/* ================= 底部转化区 (CTA Section) ================= */
.cta-banner {
  background: radial-gradient(circle at 50% 50%, #1e253d 0%, #0d121f 100%);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 64px 36px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-glow);
}

.cta-banner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, #38bdf8, #6366f1, transparent);
}

.cta-banner h2 {
  font-size: 38px;
  font-weight: 900;
  color: var(--text-light);
  margin-bottom: 16px;
}

.cta-banner p {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 660px;
  margin: 0 auto 32px auto;
}

.cta-btn-group {
  display: flex;
  justify-content: center;
  gap: 16px;
}

/* ================= 页脚 (Footer) ================= */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: #07090e;
  padding: 48px 0 32px 0;
  margin-top: 40px;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  list-style: none;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-nav a {
  font-size: 15px;
  color: var(--text-muted);
  font-weight: 500;
}

.footer-nav a:hover {
  color: var(--text-light);
  text-decoration: underline;
}

.footer-copy {
  text-align: center;
  font-size: 13px;
  color: var(--text-dim);
}

/* ================= 响应式适配 (Media Queries) ================= */
@media (max-width: 992px) {
  .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,
  .why-row {
    grid-template-columns: 1fr;
    gap: 36px;
  }

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

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

  .menu-toggle {
    display: block;
  }

  /* 移动端菜单激活样式 */
  .navbar.mobile-open .nav-links {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: #0a0d14;
    border-bottom: 1px solid var(--border-subtle);
    padding: 24px;
    gap: 18px;
    align-items: flex-start;
  }

  .navbar.mobile-open .nav-actions {
    display: flex;
    flex-direction: column;
    width: 100%;
    margin-top: 14px;
  }

  .navbar.mobile-open .nav-actions .btn {
    width: 100%;
  }

  .hero-section {
    padding-top: 110px;
    padding-bottom: 60px;
  }

  .hero-title {
    font-size: 32px;
    letter-spacing: -0.5px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

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

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

  .section-heading {
    font-size: 28px;
  }

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

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

  .cta-banner {
    padding: 40px 20px;
  }

  .cta-banner h2 {
    font-size: 26px;
  }

  .cta-banner p {
    font-size: 15px;
  }

  .footer-nav {
    gap: 20px;
  }
}

@media (max-width: 480px) {
  .hero-stats-bar {
    grid-template-columns: 1fr 1fr;
    padding: 16px;
  }
  
  .stat-val {
    font-size: 20px;
  }
  
  .speed-gauges-grid {
    grid-template-columns: 1fr;
  }
}