/* ==========================================================================
   Ssrdog 官方网络加速器 - 核心视觉与布局样式表 (Pure Native CSS)
   特性：极速秒开、零外部依赖、响应式自适应、现代暗黑极客美学
   ========================================================================== */

:root {
  --bg-main: #07090e;
  --bg-card: rgba(18, 24, 38, 0.75);
  --bg-card-hover: rgba(26, 34, 54, 0.9);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(0, 242, 254, 0.35);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --primary-cyan: #00f2fe;
  --primary-blue: #4facfe;
  --primary-purple: #7928ca;
  --primary-pink: #ff0080;
  --accent-green: #10b981;
  --accent-orange: #f59e0b;
  --gradient-brand: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
  --gradient-purple: linear-gradient(135deg, #7928ca 0%, #ff0080 100%);
  --gradient-dark: linear-gradient(180deg, rgba(7, 9, 14, 0) 0%, #07090e 100%);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --shadow-glow: 0 0 35px rgba(0, 242, 254, 0.2);
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --container-max: 1200px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  background: radial-gradient(circle at 50% 0%, rgba(30, 58, 138, 0.25) 0%, transparent 60%),
              radial-gradient(circle at 10% 30%, rgba(121, 40, 202, 0.15) 0%, transparent 40%),
              radial-gradient(circle at 90% 70%, rgba(0, 242, 254, 0.12) 0%, transparent 50%),
              var(--bg-main);
  background-attachment: fixed;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   排版与通用组件
   ========================================================================== */

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

.section-tag {
  display: inline-block;
  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;
  text-transform: uppercase;
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
  background: linear-gradient(180deg, #ffffff 30%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  line-height: 1.65;
}

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

.btn-primary {
  background: var(--gradient-brand);
  color: #07090e;
  box-shadow: 0 4px 20px rgba(0, 242, 254, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 242, 254, 0.5);
  filter: brightness(1.05);
}

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

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

.btn-lg {
  padding: 16px 36px;
  font-size: 1.1rem;
  font-weight: 700;
}

/* ==========================================================================
   导航栏 (Navbar)
   ========================================================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: 76px;
  transition: background-color 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(7, 9, 14, 0.7);
  border-bottom: 1px solid var(--border-subtle);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #ffffff;
}

.brand-logo svg,
.brand-logo img {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  object-fit: cover;
  filter: drop-shadow(0 0 10px rgba(0, 242, 254, 0.65));
  transition: transform 0.25s ease, filter 0.25s ease;
  display: block;
}

.brand-logo:hover svg,
.brand-logo:hover img {
  transform: scale(1.06);
  filter: drop-shadow(0 0 16px rgba(0, 242, 254, 0.9));
}

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

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 28px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.2s ease;
  position: relative;
  padding: 6px 0;
}

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

.nav-link.badge-news {
  position: relative;
}

.nav-link.badge-news::after {
  content: "HOT";
  position: absolute;
  top: -8px;
  right: -24px;
  background: var(--gradient-purple);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: var(--radius-full);
}

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

.nav-btn-login {
  color: var(--text-main);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: var(--radius-full);
  transition: var(--transition);
}

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

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

.hamburger-btn svg {
  width: 26px;
  height: 26px;
}

/* ==========================================================================
   首屏横幅区 (Hero Section)
   ========================================================================== */

.hero-section {
  padding-top: 150px;
  padding-bottom: 90px;
  position: relative;
  text-align: center;
  overflow: hidden;
}

.hero-glow-orb {
  position: absolute;
  top: 10%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 350px;
  background: radial-gradient(ellipse, rgba(0, 242, 254, 0.15) 0%, rgba(121, 40, 202, 0.1) 40%, transparent 70%);
  filter: blur(60px);
  z-index: -1;
  pointer-events: none;
}

.promo-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 20px;
  background: rgba(255, 0, 128, 0.12);
  border: 1px solid rgba(255, 0, 128, 0.35);
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  color: #ff4da6;
  margin-bottom: 24px;
  box-shadow: 0 0 20px rgba(255, 0, 128, 0.2);
  animation: pulse 2.5s infinite;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: #ff0080;
  border-radius: 50%;
  box-shadow: 0 0 8px #ff0080;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.03); }
  100% { transform: scale(1); }
}

.hero-title {
  font-size: clamp(2.3rem, 5.5vw, 3.8rem);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.03em;
  margin-bottom: 22px;
  max-width: 960px;
  margin-left: auto;
  margin-right: auto;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  color: var(--text-muted);
  max-width: 780px;
  margin: 0 auto 36px;
  line-height: 1.65;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

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

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

.trust-icon {
  color: var(--accent-green);
  font-size: 1rem;
}

/* ==========================================================================
   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: 36px;
}

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

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary-cyan), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

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

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

.card-icon-wrap {
  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: 22px;
  color: var(--primary-cyan);
}

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

.feature-card h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: #fff;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* 流媒体与 AI 支持大图卡 */
.streaming-card {
  background: linear-gradient(135deg, rgba(20, 26, 45, 0.8) 0%, rgba(13, 17, 28, 0.9) 100%);
  border: 1px solid rgba(0, 242, 254, 0.2);
  border-radius: var(--radius-lg);
  padding: 40px;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
}

.streaming-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 20px;
}

.streaming-header h3 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.streaming-header p {
  color: var(--text-muted);
  font-size: 0.98rem;
  max-width: 680px;
}

.badge-tag-stream {
  padding: 6px 14px;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.35);
  color: var(--accent-green);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 700;
  white-space: nowrap;
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 16px;
}

.platform-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px 10px;
  text-align: center;
  transition: var(--transition);
}

.platform-item:hover {
  background: rgba(0, 242, 254, 0.08);
  border-color: rgba(0, 242, 254, 0.3);
  transform: translateY(-3px);
}

.platform-icon {
  font-size: 1.8rem;
  margin-bottom: 8px;
}

.platform-name {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
}

.platform-status {
  font-size: 0.72rem;
  color: var(--accent-green);
  margin-top: 2px;
}

/* ==========================================================================
   定价卡片区 (Pricing Section)
   ========================================================================== */

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

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  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: var(--border-glow);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

/* VIP2 推荐卡片高亮 */
.pricing-card.featured {
  background: linear-gradient(180deg, rgba(25, 33, 56, 0.85) 0%, rgba(15, 20, 36, 0.95) 100%);
  border: 2px solid var(--primary-cyan);
  box-shadow: 0 10px 40px -10px rgba(0, 242, 254, 0.3);
  transform: scale(1.03);
}

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

.card-badge-recommend {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-brand);
  color: #07090e;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  box-shadow: 0 4px 15px rgba(0, 242, 254, 0.4);
}

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

.plan-name {
  font-size: 1.45rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.plan-price-wrap {
  margin: 18px 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

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

.price {
  font-size: 3.2rem;
  font-weight: 900;
  color: #fff;
  line-height: 1;
}

.billing-cycle {
  font-size: 0.92rem;
  color: var(--text-dim);
}

.traffic-highlight {
  display: inline-block;
  background: rgba(0, 242, 254, 0.1);
  color: var(--primary-cyan);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  margin-bottom: 6px;
}

.plan-features {
  list-style: none;
  margin-bottom: 32px;
  flex-grow: 1;
}

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

.check-icon {
  color: var(--accent-green);
  font-size: 1.1rem;
  flex-shrink: 0;
}

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

/* ==========================================================================
   深度特性解析区 (Why Choose Section)
   ========================================================================== */

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

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

.feature-deep-row.reverse {
  direction: rtl;
}

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

.deep-text-content h3 {
  font-size: clamp(1.8rem, 3vw, 2.3rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 18px;
}

.deep-text-content p {
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 24px;
}

.feature-bullets {
  list-style: none;
  margin-bottom: 28px;
}

.feature-bullets li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 12px;
  font-size: 0.96rem;
  color: #e2e8f0;
}

.bullet-icon {
  color: var(--primary-cyan);
  margin-top: 3px;
  font-weight: bold;
}

/* 视觉化动态数据面板 */
.data-panel-card {
  background: #0d121f;
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--shadow-card), var(--shadow-glow);
  position: relative;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-subtle);
}

.panel-title {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 8px;
}

.live-indicator {
  display: inline-block;
  width: 8px;
  height: 8px;
  background-color: var(--accent-green);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-green);
}

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

.metric-box {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
}

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

.metric-value {
  font-size: 1.6rem;
  font-weight: 800;
  color: #fff;
}

.metric-value.cyan {
  color: var(--primary-cyan);
}

.metric-value.green {
  color: var(--accent-green);
}

.node-status-bar {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.node-bar-item {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.node-progress {
  height: 6px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-top: 4px;
}

.node-progress-fill {
  height: 100%;
  background: var(--gradient-brand);
  border-radius: var(--radius-full);
}

/* 极客风格终端代码块 (Strict_No_Logs_Policy.sh) */
.terminal-window {
  background: #0a0d14;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
  font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

.terminal-header {
  background: #141824;
  padding: 12px 18px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.terminal-dots {
  display: flex;
  gap: 7px;
  margin-right: 16px;
}

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

.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27c93f; }

.terminal-title {
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 600;
}

.terminal-body {
  padding: 22px;
  font-size: 0.86rem;
  line-height: 1.7;
  color: #cbd5e1;
}

.terminal-line {
  margin-bottom: 8px;
}

.prompt-sign {
  color: var(--primary-cyan);
  font-weight: bold;
}

.cmd-text {
  color: #f8fafc;
}

.term-comment {
  color: var(--text-dim);
}

.term-success {
  color: var(--accent-green);
  font-weight: 600;
}

.term-info {
  color: var(--primary-blue);
}

/* ==========================================================================
   用户评价跑马灯区 (Testimonials Marquee Section)
   ========================================================================== */

.testimonials-section {
  padding: 90px 0;
  position: relative;
  overflow: hidden;
}

.marquee-container {
  display: flex;
  width: 100%;
  overflow: hidden;
  user-select: none;
  mask-image: linear-gradient(to right, transparent, black 12%, black 88%, transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, black 12%, black 88%, transparent);
}

.marquee-track {
  display: flex;
  gap: 24px;
  animation: scrollMarquee 35s linear infinite;
  flex-shrink: 0;
}

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

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

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

.testimonial-card:hover {
  border-color: rgba(0, 242, 254, 0.4);
  transform: translateY(-4px);
}

.testimonial-stars {
  color: #f59e0b;
  font-size: 0.95rem;
  margin-bottom: 12px;
}

.testimonial-text {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
}

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

.user-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--gradient-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #07090e;
  font-weight: 700;
  font-size: 0.95rem;
}

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

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

/* ==========================================================================
   常见问题解答区 (FAQ Section)
   ========================================================================== */

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

.faq-container {
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item[open] {
  border-color: var(--border-glow);
  background: rgba(20, 28, 48, 0.85);
}

.faq-item summary {
  padding: 22px 26px;
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

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

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

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

.faq-answer {
  padding: 0 26px 24px;
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.7;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  padding-top: 16px;
}

/* ==========================================================================
   底部转化拦截区 (CTA Section)
   ========================================================================== */

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

.bottom-cta-card {
  background: radial-gradient(circle at center, rgba(30, 58, 138, 0.4) 0%, rgba(13, 17, 28, 0.95) 70%);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 70px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6), var(--shadow-glow);
}

.bottom-cta-card h2 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 900;
  margin-bottom: 18px;
  color: #fff;
}

.bottom-cta-card p {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 650px;
  margin: 0 auto 36px;
}

/* ==========================================================================
   页脚 (Footer)
   ========================================================================== */

.footer {
  border-top: 1px solid var(--border-subtle);
  background: #05070a;
  padding: 50px 0 35px;
  text-align: center;
}

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

.footer-nav a {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

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

.footer-copy {
  color: var(--text-dim);
  font-size: 0.85rem;
  line-height: 1.6;
}

/* ==========================================================================
   响应式媒体查询 (Responsive Breakpoints)
   ========================================================================== */

@media (max-width: 992px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: 0 auto;
  }

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

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

  .feature-deep-row,
  .feature-deep-row.reverse {
    grid-template-columns: 1fr;
    gap: 36px;
    direction: ltr;
  }
}

@media (max-width: 768px) {
  .navbar {
    height: 68px;
  }

  .nav-links {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: rgba(7, 9, 14, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 30px 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border-subtle);
    display: none;
  }

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

  .nav-actions {
    display: none;
  }

  .hamburger-btn {
    display: block;
  }

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

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

  .streaming-card {
    padding: 26px 20px;
  }

  .data-metrics-grid {
    grid-template-columns: 1fr;
  }

  .bottom-cta-card {
    padding: 45px 20px;
  }

  .footer-nav {
    gap: 20px;
  }

  .btn-lg {
    width: 100%;
    padding: 16px 20px;
  }

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

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

@media (max-width: 480px) {
  .hero-trust-bar {
    gap: 16px;
    flex-direction: column;
  }

  .terminal-body {
    padding: 16px;
    font-size: 0.78rem;
  }
}

/* ==========================================================================
   深度资讯与 SEO 博客文章专区样式 (Articles Hub Styling)
   ========================================================================== */

.articles-page-header {
  padding-top: 130px;
  padding-bottom: 50px;
  text-align: center;
  background: radial-gradient(circle at 50% 20%, rgba(0, 242, 254, 0.12) 0%, transparent 60%);
}

.articles-container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.article-toc-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 30px;
  margin-bottom: 50px;
  backdrop-filter: blur(10px);
}

.article-toc-box h3 {
  font-size: 1.25rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-toc-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.article-toc-list li a {
  color: var(--text-muted);
  font-size: 0.96rem;
  transition: color 0.2s ease;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.article-toc-list li a:hover {
  color: var(--primary-cyan);
}

.toc-num {
  font-weight: 700;
  color: var(--primary-cyan);
  font-size: 0.85rem;
}

.seo-article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 44px 38px;
  margin-bottom: 48px;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-card);
}

.seo-article-card:hover {
  border-color: rgba(0, 242, 254, 0.25);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.article-meta-tag {
  background: rgba(0, 242, 254, 0.1);
  color: var(--primary-cyan);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-weight: 600;
}

.seo-article-title {
  font-size: clamp(1.5rem, 2.8vw, 2rem);
  font-weight: 800;
  line-height: 1.35;
  color: #fff;
  margin-bottom: 24px;
}

.article-content {
  color: #cbd5e1;
  font-size: 1.02rem;
  line-height: 1.85;
}

.article-content h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #f1f5f9;
  margin: 28px 0 14px;
  padding-left: 12px;
  border-left: 3px solid var(--primary-cyan);
}

.article-content h4 {
  font-size: 1.15rem;
  font-weight: 600;
  color: #e2e8f0;
  margin: 20px 0 10px;
}

.article-content p {
  margin-bottom: 18px;
}

.article-content ul, .article-content ol {
  margin: 0 0 20px 24px;
}

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

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

.article-content blockquote {
  border-left: 4px solid var(--primary-purple);
  background: rgba(121, 40, 202, 0.1);
  padding: 16px 20px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 20px 0;
  color: #e2e8f0;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.92rem;
}

.article-content th, .article-content td {
  padding: 12px 16px;
  border: 1px solid var(--border-subtle);
  text-align: left;
}

.article-content th {
  background: rgba(255, 255, 255, 0.05);
  color: #fff;
  font-weight: 700;
}

.article-content td {
  background: rgba(255, 255, 255, 0.02);
}

.article-link-highlight {
  color: var(--primary-cyan);
  text-decoration: underline;
  font-weight: 600;
  transition: color 0.2s ease;
}

.article-link-highlight:hover {
  color: #38bdf8;
}

.article-footer-cta {
  background: rgba(0, 242, 254, 0.05);
  border: 1px dashed rgba(0, 242, 254, 0.3);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-top: 28px;
  text-align: center;
}