/* ==========================================================================
   迷雾通 (Miwutong) 官方落地页 - 智能 AI 神经元风 (Neural Net & AI Cortex)
   零重型依赖 · 纯 CSS3 · 高性能秒开 · 深度优化
   ========================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "Fira Code", "Cascadia Code", Consolas, Monaco, "Courier New", monospace;
  
  /* 品牌与色彩系统 - 智能 AI 神经元风 (Neural Net & AI Cortex) */
  --bg-primary: #070a11;
  --bg-secondary: #0c121e;
  --bg-tertiary: #111a2c;
  --bg-card: rgba(13, 20, 34, 0.82);
  --bg-glass: rgba(10, 16, 28, 0.90);
  
  --border-color: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(16, 163, 127, 0.5);
  --border-card-hover: rgba(16, 163, 127, 0.35);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-highlight: #10a37f;
  
  /* AI 神经元标志性强调色 */
  --accent-cyan: #00f2fe;
  --accent-blue: #38bdf8;
  --accent-purple: #8b5cf6;
  --accent-emerald: #10a37f;      /* OpenAI 智械青 */
  --accent-anthropic: #d97757;    /* Anthropic 暖铜金 */
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  
  --gradient-brand: linear-gradient(135deg, #10a37f 0%, #00f2fe 50%, #38bdf8 100%);
  --gradient-glow: radial-gradient(circle at 50% 30%, rgba(16, 163, 127, 0.2) 0%, rgba(56, 189, 248, 0.12) 40%, transparent 70%);
  --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 0.04) 0%, rgba(255, 255, 255, 0.01) 100%);
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.5);
  --shadow-neon: 0 0 25px rgba(16, 163, 127, 0.4);
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-text-size-adjust: 100%;
}

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

/* 神经元点阵网络背景与突触光晕 (Neural Synaptic Matrix) */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-image: 
    radial-gradient(rgba(16, 163, 127, 0.14) 1px, transparent 1px),
    radial-gradient(rgba(56, 189, 248, 0.09) 1px, transparent 1px),
    linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
  background-size: 32px 32px, 64px 64px, 64px 64px, 64px 64px;
  background-position: 0 0, 16px 16px, 0 0, 0 0;
  pointer-events: none;
  z-index: -2;
}

body::after {
  content: "";
  position: fixed;
  top: -22vh;
  left: 50%;
  transform: translateX(-50%);
  width: 1100px;
  height: 650px;
  background: radial-gradient(circle at 50% 30%, rgba(16, 163, 127, 0.22) 0%, rgba(37, 99, 235, 0.12) 45%, transparent 70%);
  filter: blur(110px);
  pointer-events: none;
  z-index: -1;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

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

ul, ol {
  list-style: none;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-normal);
  text-align: center;
  white-space: nowrap;
  user-select: none;
}

.btn-primary {
  background: linear-gradient(135deg, #10a37f 0%, #00f2fe 50%, #38bdf8 100%);
  color: #040e13;
  font-weight: 700;
  box-shadow: 0 4px 18px rgba(16, 163, 127, 0.38), 0 0 20px rgba(0, 242, 254, 0.2);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(16, 163, 127, 0.58), 0 0 32px rgba(0, 242, 254, 0.35);
  filter: brightness(1.08);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
  color: #fff;
}

.btn-glow {
  position: relative;
  overflow: hidden;
}

.btn-glow::after {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.3) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.btn-glow:hover::after {
  opacity: 1;
}

/* ==========================================================================
   1. 导航栏 (Navbar)
   ========================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  transition: background var(--transition-normal), backdrop-filter var(--transition-normal), border var(--transition-normal), padding var(--transition-normal);
  padding: 18px 0;
  background: transparent;
}

.navbar.scrolled {
  background: rgba(10, 13, 20, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 12px 0;
  box-shadow: var(--shadow-sm);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #fff;
}

.logo-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, #10a37f, #00f2fe);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 18px rgba(16, 163, 127, 0.5);
  color: #040e13;
}

.logo-text {
  background: linear-gradient(135deg, #fff 40%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

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

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-cyan);
  transition: width var(--transition-fast);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.nav-actions .btn-login {
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.92rem;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: all var(--transition-fast);
}

.nav-actions .btn-login:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.05);
}

.nav-actions .btn-cta {
  padding: 9px 20px;
  font-size: 0.92rem;
}

.hamburger-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--text-primary);
}

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

.hero-content {
  max-width: 860px;
  margin: 0 auto;
}

.discount-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: var(--radius-full);
  background: rgba(217, 119, 87, 0.14);
  border: 1px solid rgba(217, 119, 87, 0.4);
  color: #fb923c;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 28px;
  box-shadow: 0 0 20px rgba(217, 119, 87, 0.2);
  animation: pulse-border 2.5s infinite;
}

@keyframes pulse-border {
  0%, 100% {
    box-shadow: 0 0 15px rgba(217, 119, 87, 0.2);
  }
  50% {
    box-shadow: 0 0 25px rgba(217, 119, 87, 0.45);
    border-color: rgba(217, 119, 87, 0.65);
  }
}

.discount-badge .sparkle {
  color: #f97316;
}

.hero-title {
  font-size: 3.25rem;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -1px;
  margin-bottom: 24px;
}

.hero-title .brand-gradient {
  background: linear-gradient(135deg, #10a37f 10%, #00f2fe 50%, #60a5fa 90%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 760px;
  margin: 0 auto 36px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 54px;
  flex-wrap: wrap;
}

.hero-cta-group .btn {
  padding: 15px 36px;
  font-size: 1.05rem;
}

.hero-features-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 960px;
  margin: 0 auto;
  padding: 20px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
}

.feature-pill {
  display: flex;
  align-items: center;
  gap: 12px;
  text-align: left;
}

.feature-pill-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid rgba(0, 242, 254, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  flex-shrink: 0;
}

.feature-pill-text strong {
  display: block;
  font-size: 0.95rem;
  color: #fff;
}

.feature-pill-text span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ==========================================================================
   板块通用标题
   ========================================================================== */
.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid rgba(0, 242, 254, 0.25);
  color: var(--accent-cyan);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 14px;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 800;
  line-height: 1.28;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

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

/* ==========================================================================
   3. 核心优势图卡区 (Dynamic Cards Section)
   ========================================================================== */
.dynamic-cards-section {
  padding: 90px 0;
}

.cards-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 30px;
}

.card-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.card-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-brand);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.card-item:hover {
  transform: translateY(-6px);
  border-color: var(--border-card-hover);
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.5), 0 0 25px rgba(16, 163, 127, 0.2);
}

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

.card-icon-box {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background: rgba(16, 163, 127, 0.12);
  border: 1px solid rgba(16, 163, 127, 0.28);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #10a37f;
  margin-bottom: 24px;
}

.card-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: #fff;
}

.card-desc {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
  flex-grow: 1;
}

.card-points {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.card-point-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.card-point-item svg {
  color: var(--accent-emerald);
  flex-shrink: 0;
}

/* 流媒体与 AI 支持大卡 */
.streaming-ai-card {
  background: linear-gradient(135deg, rgba(22, 32, 51, 0.9) 0%, rgba(16, 22, 35, 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 1.2fr;
  gap: 40px;
  align-items: center;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.streaming-info h3 {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: #fff;
}

.streaming-info p {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.7;
  margin-bottom: 24px;
}

.badges-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.media-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 600;
  color: #fff;
  transition: all var(--transition-fast);
}

.media-badge:hover {
  background: rgba(0, 242, 254, 0.12);
  border-color: rgba(0, 242, 254, 0.3);
  transform: translateY(-2px);
}

.media-badge.ai-badge {
  background: rgba(16, 163, 127, 0.14);
  border-color: rgba(16, 163, 127, 0.35);
  color: #34d399;
}

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

.metric-box {
  background: rgba(10, 13, 20, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
  padding: 20px;
}

.metric-value {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  margin-bottom: 4px;
}

.metric-label {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   4. 定价卡片区 (Pricing Section)
   ========================================================================== */
.pricing-section {
  padding: 90px 0;
  background: linear-gradient(180deg, transparent 0%, rgba(16, 22, 35, 0.4) 50%, transparent 100%);
}

.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: 38px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5);
}

.pricing-card.featured {
  background: linear-gradient(180deg, rgba(16, 32, 44, 0.9) 0%, rgba(13, 20, 34, 0.96) 100%);
  border: 2px solid #10a37f;
  box-shadow: 0 0 35px rgba(16, 163, 127, 0.3);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-6px);
  box-shadow: 0 0 45px rgba(16, 163, 127, 0.45);
}

.pricing-badge-popular {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #10a37f, #38bdf8);
  color: #040e13;
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 14px rgba(16, 163, 127, 0.45);
}

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

.pricing-tier-name {
  font-size: 1.45rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: #fff;
}

.pricing-price-wrap {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  margin: 16px 0 10px;
}

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

.pricing-amount {
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1;
  color: #fff;
  font-family: var(--font-sans);
}

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

.pricing-traffic-badge {
  display: inline-block;
  padding: 6px 14px;
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid rgba(0, 242, 254, 0.25);
  color: var(--accent-cyan);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
}

.pricing-features {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.pricing-feature-item svg {
  width: 18px;
  height: 18px;
  color: var(--accent-emerald);
  flex-shrink: 0;
  margin-top: 2px;
}

.pricing-cta-btn {
  width: 100%;
  padding: 14px 20px;
  font-size: 1rem;
}

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

.why-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
  margin-bottom: 80px;
}

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

.why-content h3 {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 18px;
  color: #fff;
}

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

.why-check-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.why-check-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.why-check-item svg {
  color: var(--accent-cyan);
  flex-shrink: 0;
}

/* 动态数据面板 */
.data-panel-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

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

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

.live-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-emerald);
  box-shadow: 0 0 10px var(--accent-emerald);
  animation: pulse-dot 1.5s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.panel-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-bottom: 24px;
}

.panel-stat-item {
  background: rgba(10, 13, 20, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  padding: 16px;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.stat-number {
  font-size: 1.6rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
}

.panel-bandwidth-meter {
  background: rgba(10, 13, 20, 0.5);
  border-radius: var(--radius-md);
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

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

.progress-track {
  width: 100%;
  height: 8px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  width: 94%;
  height: 100%;
  background: linear-gradient(90deg, #00f2fe, #4facfe);
  border-radius: var(--radius-full);
}

/* 极客终端代码块 */
.terminal-block {
  background: #0d1117;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6);
  font-family: var(--font-mono);
}

.terminal-header {
  background: #161b22;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.term-btn {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: inline-block;
}

.term-btn.red { background: #ff5f56; }
.term-btn.yellow { background: #ffbd2e; }
.term-btn.green { background: #27c93f; }

.term-title {
  margin-left: 10px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.terminal-body {
  padding: 20px;
  font-size: 0.85rem;
  line-height: 1.7;
  color: #c9d1d9;
}

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

.term-line.cmd {
  color: #58a6ff;
}

.term-line.success {
  color: #3fb950;
}

.term-line.highlight {
  color: #ff7b72;
}

.term-line.notice {
  color: #d2a8ff;
}

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

.marquee-container {
  width: 100%;
  overflow: hidden;
  position: relative;
  mask-image: linear-gradient(90deg, transparent 0%, #000 10%, #000 90%, transparent 100%);
  -webkit-mask-image: linear-gradient(90deg, transparent 0%, #000 10%, #000 90%, transparent 100%);
  padding: 20px 0;
}

.marquee-track {
  display: flex;
  gap: 24px;
  width: max-content;
  animation: marquee 38s linear infinite;
}

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

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

.review-card {
  width: 360px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
  flex-shrink: 0;
}

.review-card:hover {
  border-color: rgba(0, 242, 254, 0.3);
  transform: translateY(-4px);
}

.review-stars {
  display: flex;
  gap: 4px;
  color: #fbbf24;
  margin-bottom: 14px;
}

.review-text {
  font-size: 0.92rem;
  color: #cbd5e1;
  line-height: 1.65;
  margin-bottom: 18px;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 14px;
}

.author-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, #00f2fe, #8b5cf6);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #070b14;
  font-size: 0.85rem;
}

.author-info strong {
  display: block;
  font-size: 0.9rem;
  color: #fff;
}

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

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

.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-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-fast);
}

.faq-item[open] {
  border-color: rgba(0, 242, 254, 0.35);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

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

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

.faq-icon-cross {
  width: 20px;
  height: 20px;
  position: relative;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.faq-icon-cross::before,
.faq-icon-cross::after {
  content: "";
  position: absolute;
  background-color: var(--accent-cyan);
  transition: transform var(--transition-fast);
}

.faq-icon-cross::before {
  top: 9px;
  left: 2px;
  width: 16px;
  height: 2px;
}

.faq-icon-cross::after {
  top: 2px;
  left: 9px;
  width: 2px;
  height: 16px;
}

.faq-item[open] .faq-icon-cross {
  transform: rotate(45deg);
}

.faq-content {
  padding: 0 24px 22px;
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.75;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  padding-top: 16px;
}

/* ==========================================================================
   8. 底部二次转化区 (CTA Section)
   ========================================================================== */
.bottom-cta-section {
  padding: 80px 0 100px;
}

.cta-banner-box {
  background: linear-gradient(135deg, rgba(16, 26, 42, 0.95) 0%, rgba(7, 10, 17, 0.98) 100%);
  border: 1px solid rgba(16, 163, 127, 0.35);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6), 0 0 35px rgba(16, 163, 127, 0.2);
}

.cta-banner-box::before {
  content: "";
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 300px;
  background: radial-gradient(circle, rgba(16, 163, 127, 0.22) 0%, transparent 70%);
  filter: blur(60px);
  pointer-events: none;
}

.cta-banner-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 18px;
  color: #fff;
  letter-spacing: -0.5px;
}

.cta-banner-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

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

.btn-large {
  padding: 16px 42px;
  font-size: 1.1rem;
  border-radius: var(--radius-md);
}

/* ==========================================================================
   9. 页脚 (Footer) - 严格保留四个标题
   ========================================================================== */
.site-footer {
  background: #07090e;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 50px 0 35px;
  text-align: center;
}

.footer-nav-titles {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.footer-nav-link {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
}

.footer-nav-link:hover {
  color: var(--accent-cyan);
  background: rgba(0, 242, 254, 0.05);
}

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

/* ==========================================================================
   子页面专用基础样式 (Subpages: about, terms, privacy, sitemap)
   ========================================================================== */
.subpage-hero {
  padding: 140px 0 60px;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  background: linear-gradient(180deg, rgba(16, 22, 35, 0.8) 0%, transparent 100%);
}

.subpage-content {
  padding: 60px 0 90px;
}

.article-container {
  max-width: 860px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 45px;
  box-shadow: var(--shadow-md);
}

.article-container h2 {
  font-size: 1.6rem;
  color: #fff;
  margin: 36px 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.article-container h2:first-of-type {
  margin-top: 0;
}

.article-container h3 {
  font-size: 1.25rem;
  color: var(--accent-cyan);
  margin: 24px 0 12px;
}

.article-container p, .article-container li {
  font-size: 0.98rem;
  color: #cbd5e1;
  line-height: 1.8;
  margin-bottom: 14px;
}

.article-container ul {
  padding-left: 20px;
  list-style: disc;
  margin-bottom: 20px;
}

.back-home-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  font-size: 0.9rem;
  color: var(--accent-cyan);
  font-weight: 600;
}

/* ==========================================================================
   响应式适配 (Responsive Media Queries)
   ========================================================================== */
@media (max-width: 992px) {
  .hero-title {
    font-size: 2.6rem;
  }
  
  .hero-features-bar {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .cards-grid-3 {
    grid-template-columns: 1fr;
  }
  
  .streaming-ai-card {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 520px;
    margin: 0 auto;
  }
  
  .pricing-card.featured {
    transform: none;
  }
  
  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }
  
  .why-row {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  
  .why-row.reverse-mobile {
    display: flex;
    flex-direction: column-reverse;
  }
}

@media (max-width: 768px) {
  .navbar {
    padding: 14px 0;
  }
  
  .hamburger-btn {
    display: block;
  }
  
  .nav-links {
    position: fixed;
    top: 68px;
    left: 0;
    width: 100%;
    background: rgba(10, 13, 20, 0.96);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 24px 20px;
    gap: 18px;
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-normal);
  }
  
  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  
  .nav-link {
    font-size: 1.05rem;
    width: 100%;
    text-align: center;
    padding: 8px 0;
  }
  
  .nav-actions .btn-login {
    display: none;
  }
  
  .hero-section {
    padding-top: 120px;
    padding-bottom: 60px;
  }
  
  .hero-title {
    font-size: 2.1rem;
  }
  
  .hero-desc {
    font-size: 1rem;
  }
  
  .hero-features-bar {
    grid-template-columns: 1fr;
  }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-cta-group .btn {
    width: 100%;
  }
  
  .section-title {
    font-size: 1.85rem;
  }
  
  .cta-banner-box {
    padding: 40px 20px;
  }
  
  .cta-banner-title {
    font-size: 1.85rem;
  }
  
  .cta-banner-actions {
    flex-direction: column;
    width: 100%;
  }
  
  .cta-banner-actions .btn {
    width: 100%;
  }
  
  .footer-nav-titles {
    gap: 18px;
    flex-direction: column;
  }
  
  .article-container {
    padding: 24px 18px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.85rem;
  }
  
  .streaming-metric-grid {
    grid-template-columns: 1fr;
  }
  
  .panel-stats-grid {
    grid-template-columns: 1fr;
  }
  
  .review-card {
    width: 290px;
  }
}

/* ==========================================================================
   推荐资讯与万字深度 SEO 文章专用样式 (Articles & Insights)
   ========================================================================== */
.insights-hero {
  padding: 140px 0 60px;
  text-align: center;
  background: radial-gradient(circle at 50% 20%, rgba(0, 242, 254, 0.12) 0%, transparent 60%);
  border-bottom: 1px solid var(--border-color);
}

.insights-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 40px;
  padding: 60px 0 100px;
  align-items: start;
}

.insights-sidebar {
  position: sticky;
  top: 90px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-md);
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}

.sidebar-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  gap: 8px;
}

.sidebar-menu {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sidebar-link {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  display: block;
  border-left: 2px solid transparent;
}

.sidebar-link:hover {
  color: var(--accent-cyan);
  background: rgba(0, 242, 254, 0.08);
  border-left-color: var(--accent-cyan);
  transform: translateX(4px);
}

.insights-main {
  display: flex;
  flex-direction: column;
  gap: 60px;
}

.seo-article {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 45px;
  box-shadow: var(--shadow-md);
  transition: border-color var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.seo-article:hover {
  border-color: rgba(0, 242, 254, 0.3);
}

.seo-article::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-brand);
}

.article-header {
  margin-bottom: 28px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 22px;
}

.article-category {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-cyan);
  background: rgba(0, 242, 254, 0.1);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}

.article-title {
  font-size: 1.9rem;
  font-weight: 800;
  line-height: 1.35;
  color: #fff;
  margin-bottom: 14px;
  letter-spacing: -0.5px;
}

.article-meta-info {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.84rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-meta-info span {
  display: flex;
  align-items: center;
  gap: 5px;
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  margin: 34px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.article-content h3 {
  font-size: 1.22rem;
  font-weight: 600;
  color: var(--accent-cyan);
  margin: 22px 0 12px;
}

.article-content p {
  font-size: 1rem;
  color: #cbd5e1;
  line-height: 1.85;
  margin-bottom: 18px;
}

.article-content ul, .article-content ol {
  margin: 16px 0 22px 24px;
}

.article-content li {
  font-size: 0.98rem;
  color: #cbd5e1;
  line-height: 1.8;
  margin-bottom: 10px;
}

.article-content strong {
  color: #fff;
}

.article-content a {
  color: var(--accent-cyan);
  text-decoration: underline;
  text-underline-offset: 4px;
  font-weight: 600;
}

.article-content a:hover {
  color: #38bdf8;
  text-shadow: 0 0 8px rgba(56, 189, 248, 0.4);
}

.article-table-wrap {
  overflow-x: auto;
  margin: 24px 0 30px;
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

.article-table th {
  background: rgba(16, 22, 35, 0.9);
  color: var(--accent-cyan);
  padding: 12px 16px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  font-weight: 700;
}

.article-table td {
  padding: 12px 16px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: #cbd5e1;
  background: rgba(10, 13, 20, 0.4);
}

.article-table tr:nth-child(even) td {
  background: rgba(16, 22, 35, 0.5);
}

.article-callout {
  background: rgba(0, 242, 254, 0.06);
  border-left: 4px solid var(--accent-cyan);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 18px 22px;
  margin: 22px 0 26px;
  color: #e2e8f0;
}

.article-callout p {
  margin-bottom: 0;
  font-size: 0.95rem;
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(22, 32, 51, 0.9) 0%, rgba(10, 13, 20, 0.95) 100%);
  border: 1px solid rgba(0, 242, 254, 0.25);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-top: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

@media (max-width: 992px) {
  .insights-layout {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .insights-sidebar {
    position: static;
    max-height: none;
  }
}

@media (max-width: 768px) {
  .seo-article {
    padding: 24px 18px;
  }
  
  .article-title {
    font-size: 1.5rem;
  }
  
  .article-cta-box {
    flex-direction: column;
    text-align: center;
  }
  
  .article-cta-box .btn {
    width: 100%;
  }
}