/* ==========================================================================
   大象网络 (Elephant Network) - 【深空钛金 · 骨干专线】科技硬核旗舰样式表
   零外部框架 / 零冗余依赖 / 毫秒级秒开 / 钛金极客质感
   ========================================================================== */

:root {
  --bg-main: #060911;
  --bg-secondary: #0a0e1c;
  --bg-card: rgba(14, 20, 36, 0.75);
  --bg-card-hover: rgba(22, 32, 56, 0.9);
  --bg-glass: rgba(10, 15, 28, 0.82);
  --border-color: rgba(148, 163, 184, 0.15);
  --border-focus: rgba(0, 242, 254, 0.6);
  --primary: #00f2fe;
  --primary-hover: #38bdf8;
  --primary-gradient: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
  --titanium-gradient: linear-gradient(135deg, #1e293b 0%, #334155 50%, #0f172a 100%);
  --titanium-border: rgba(148, 163, 184, 0.25);
  --accent-purple: #9d4edd;
  --accent-gradient: linear-gradient(135deg, #7928ca 0%, #ff0080 100%);
  --accent-green: #00e676;
  --text-main: #ffffff;
  --text-muted: #94a3b8;
  --text-sub: #cbd5e1;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
  --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-glow: 0 0 35px rgba(0, 242, 254, 0.3);
  --shadow-card: 0 15px 35px -10px rgba(0, 0, 0, 0.6);
  --max-width: 1200px;
}

*, *::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);
}

body {
  font-family: var(--font-family);
  line-height: 1.6;
  background-color: var(--bg-main);
  /* 深空钛金科技网格背景 (Cyber Backbone Blueprint Grid) */
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    radial-gradient(circle at 18% 12%, rgba(0, 242, 254, 0.12) 0%, transparent 45%),
    radial-gradient(circle at 82% 65%, rgba(121, 40, 202, 0.1) 0%, transparent 50%);
  background-size: 40px 40px, 40px 40px, auto, auto;
  background-attachment: fixed;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

img, svg {
  vertical-align: middle;
  max-width: 100%;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 按钮通用规范 - 钛金拉丝与光晕 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1rem;
  padding: 13px 28px;
  border-radius: 9999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
  white-space: nowrap;
  letter-spacing: 0.3px;
}

.btn-primary {
  background: var(--primary-gradient);
  color: #040810;
  box-shadow: 0 4px 22px rgba(0, 242, 254, 0.4);
  position: relative;
  overflow: hidden;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0, 242, 254, 0.65);
}

.btn-secondary {
  background: rgba(30, 41, 59, 0.6);
  color: var(--text-main);
  border: 1px solid var(--titanium-border);
  backdrop-filter: blur(12px);
}

.btn-secondary:hover {
  background: rgba(51, 65, 85, 0.8);
  border-color: rgba(0, 242, 254, 0.5);
  transform: translateY(-2px);
}

/* 导航栏 (Navbar) */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 72px;
  z-index: 1000;
  background: rgba(6, 9, 17, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

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

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.nav-brand-icon {
  width: 38px;
  height: 38px;
  background: var(--primary-gradient);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #040810;
  box-shadow: 0 0 16px rgba(0, 242, 254, 0.4);
}

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

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

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

.nav-link-highlight {
  color: #ffde59;
  font-weight: 600;
  position: relative;
}

.nav-link-highlight::after {
  content: "HOT";
  position: absolute;
  top: -8px;
  right: -28px;
  background: linear-gradient(135deg, #ff0055 0%, #ff5252 100%);
  color: #fff;
  font-size: 0.65rem;
  padding: 1px 5px;
  border-radius: 6px;
  font-weight: 800;
}

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

.nav-actions .btn {
  padding: 8px 20px;
  font-size: 0.9rem;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  cursor: pointer;
  padding: 6px;
}

/* 首屏横幅区 (Hero Section) */
.hero-section {
  padding-top: 140px;
  padding-bottom: 80px;
  position: relative;
  text-align: center;
}

.hero-badge-wrap {
  display: inline-flex;
  align-items: center;
  margin-bottom: 24px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 20px;
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid rgba(0, 242, 254, 0.4);
  border-radius: 9999px;
  color: var(--primary);
  font-size: 0.9rem;
  font-weight: 700;
  animation: pulse-glow 2.8s infinite;
  box-shadow: 0 0 16px rgba(0, 242, 254, 0.15);
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 10px rgba(0, 242, 254, 0.2); border-color: rgba(0, 242, 254, 0.35); }
  50% { box-shadow: 0 0 26px rgba(0, 242, 254, 0.6); border-color: rgba(0, 242, 254, 0.75); }
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -1px;
  margin-bottom: 22px;
  max-width: 960px;
  margin-left: auto;
  margin-right: auto;
}

.gradient-text {
  background: linear-gradient(135deg, #ffffff 0%, #00f2fe 60%, #4facfe 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.16rem;
  color: var(--text-sub);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 38px;
  line-height: 1.8;
}

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

.hero-cta .btn {
  min-width: 200px;
  padding: 15px 36px;
  font-size: 1.1rem;
}

/* 实时骨干节点延迟状态播报条 (Live Telemetry Ticker) */
.telemetry-ticker {
  background: rgba(14, 20, 36, 0.6);
  border: 1px solid var(--titanium-border);
  border-radius: 9999px;
  padding: 10px 24px;
  max-width: 820px;
  margin: 0 auto 36px auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.ticker-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.ticker-ping {
  color: var(--accent-green);
  font-weight: 700;
}

.hero-features-bar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  max-width: 900px;
  margin: 0 auto;
}

.hero-feature-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  color: var(--text-sub);
}

.hero-feature-item svg {
  color: var(--accent-green);
}

/* 核心优势图卡区 (Dynamic Cards Section) */
.section-pad {
  padding: 85px 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 54px;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
  background: rgba(0, 242, 254, 0.08);
  padding: 3px 12px;
  border-radius: 6px;
  border: 1px solid rgba(0, 242, 254, 0.2);
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 14px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 660px;
  margin: 0 auto;
}

.cards-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 48px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--titanium-border);
  border-radius: 20px;
  padding: 36px 30px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(14px);
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: transparent;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 242, 254, 0.5);
  box-shadow: var(--shadow-glow);
  background: var(--bg-card-hover);
}

.feature-card:hover::before {
  background: var(--primary-gradient);
}

.feature-icon-box {
  width: 58px;
  height: 58px;
  border-radius: 14px;
  background: rgba(0, 242, 254, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 24px;
  border: 1px solid rgba(0, 242, 254, 0.2);
}

.feature-card h3 {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 12px;
}

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

/* 流媒体与AI图卡 */
.media-ai-card {
  background: linear-gradient(145deg, rgba(14, 20, 38, 0.95) 0%, rgba(20, 28, 54, 0.8) 100%);
  border: 1px solid rgba(121, 40, 202, 0.35);
  border-radius: 22px;
  padding: 40px 36px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 36px;
  align-items: center;
}

.media-ai-card:hover {
  border-color: rgba(121, 40, 202, 0.7);
  box-shadow: 0 0 40px rgba(121, 40, 202, 0.3);
}

.media-ai-card h3 {
  font-size: 1.7rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.media-ai-card p {
  color: var(--text-sub);
  font-size: 0.98rem;
  margin-bottom: 22px;
  line-height: 1.7;
}

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

.unlock-tag {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  padding: 7px 15px;
  border-radius: 8px;
  font-size: 0.86rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}

.service-icons-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.service-pill {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--titanium-border);
  border-radius: 12px;
  padding: 18px 12px;
  text-align: center;
  transition: var(--transition);
}

.service-pill:hover {
  background: rgba(0, 242, 254, 0.08);
  border-color: var(--primary);
  transform: translateY(-3px);
}

.service-pill-name {
  font-size: 0.86rem;
  font-weight: 700;
  margin-top: 8px;
  color: var(--text-sub);
}

/* 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(--titanium-border);
  border-radius: 24px;
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
  backdrop-filter: blur(14px);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 242, 254, 0.35);
  box-shadow: var(--shadow-card);
}

.pricing-card.featured {
  background: linear-gradient(160deg, rgba(20, 30, 58, 0.98) 0%, rgba(14, 20, 38, 0.92) 100%);
  border: 2px solid var(--primary);
  box-shadow: 0 0 35px rgba(0, 242, 254, 0.25);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-6px);
  box-shadow: 0 0 50px rgba(0, 242, 254, 0.45);
}

.featured-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary-gradient);
  color: #040810;
  font-size: 0.82rem;
  font-weight: 800;
  padding: 5px 20px;
  border-radius: 9999px;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 14px rgba(0, 242, 254, 0.45);
}

.pricing-header {
  margin-bottom: 24px;
  text-align: center;
}

.pricing-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.pricing-traffic {
  display: inline-block;
  background: rgba(0, 242, 254, 0.12);
  color: var(--primary);
  font-size: 0.88rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 16px;
  border: 1px solid rgba(0, 242, 254, 0.25);
}

.pricing-price-box {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  margin-bottom: 12px;
}

.price-currency {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.price-val {
  font-size: 3.3rem;
  font-weight: 900;
  line-height: 1;
  color: #ffffff;
}

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

.pricing-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 24px;
}

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

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

.pricing-features li svg {
  color: var(--primary);
  flex-shrink: 0;
}

.pricing-cta {
  width: 100%;
}

/* 深度特性解析区 (Why Choose Section) */
.why-section {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.why-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
  margin-bottom: 72px;
}

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

.why-content h3 {
  font-size: 2.15rem;
  font-weight: 800;
  margin-bottom: 18px;
  line-height: 1.25;
}

.why-content p {
  font-size: 1.02rem;
  color: var(--text-sub);
  line-height: 1.75;
  margin-bottom: 24px;
}

.why-points {
  list-style: none;
}

.why-points li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--text-sub);
  margin-bottom: 14px;
}

.why-points li svg {
  color: var(--accent-green);
  flex-shrink: 0;
  margin-top: 3px;
}

/* 动态数据面板 */
.telemetry-panel {
  background: #050812;
  border: 1px solid rgba(0, 242, 254, 0.3);
  border-radius: 18px;
  padding: 30px;
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.7);
}

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

.telemetry-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-green);
  font-family: var(--font-mono);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 12px var(--accent-green);
  animation: pulse-dot 1.8s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

.telemetry-stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 22px;
}

.stat-box {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--titanium-border);
  border-radius: 12px;
  padding: 14px 16px;
}

.stat-box-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.stat-box-val {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--primary);
  font-family: var(--font-mono);
}

.speed-meter-bar {
  background: rgba(255, 255, 255, 0.06);
  height: 8px;
  border-radius: 4px;
  overflow: hidden;
  position: relative;
  margin-top: 10px;
}

.speed-meter-fill {
  width: 96%;
  height: 100%;
  background: var(--primary-gradient);
  border-radius: 4px;
}

/* 终端代码块效果 (Strict_No_Logs_Policy.sh) */
.terminal-window {
  background: #04060d;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.8);
  font-family: var(--font-mono);
}

.terminal-header {
  background: #0e1322;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
}

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

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

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

.terminal-title {
  font-size: 0.8rem;
  color: #94a3b8;
}

.terminal-body {
  padding: 20px;
  font-size: 0.85rem;
  line-height: 1.7;
  color: #d1d5db;
  overflow-x: auto;
}

.terminal-body .cmd-line {
  color: #38bdf8;
  margin-bottom: 8px;
}

.terminal-body .cmd-prompt {
  color: #a855f7;
  font-weight: 700;
}

.terminal-body .cmd-output {
  color: #9ca3af;
  margin-bottom: 8px;
  padding-left: 12px;
}

.terminal-body .cmd-success {
  color: #34d399;
  font-weight: 600;
}

.terminal-body .cmd-accent {
  color: #fbbf24;
}

/* 用户评价跑马灯区 (Testimonials Marquee) */
.marquee-wrapper {
  width: 100%;
  overflow: hidden;
  position: relative;
  padding: 20px 0;
  mask-image: linear-gradient(to right, transparent, black 15%, black 85%, transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, black 15%, black 85%, transparent);
}

.marquee-content {
  display: flex;
  gap: 24px;
  width: max-content;
  animation: scroll-marquee 42s linear infinite;
}

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

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

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--titanium-border);
  border-radius: 18px;
  padding: 26px;
  width: 360px;
  flex-shrink: 0;
  backdrop-filter: blur(8px);
}

.testimonial-card:hover {
  border-color: rgba(0, 242, 254, 0.45);
}

.testimonial-stars {
  color: #fbbf24;
  margin-bottom: 12px;
  font-size: 1rem;
}

.testimonial-text {
  font-size: 0.92rem;
  color: var(--text-sub);
  line-height: 1.65;
  margin-bottom: 16px;
}

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

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #040810;
  font-size: 0.9rem;
}

.author-info h4 {
  font-size: 0.95rem;
  font-weight: 700;
}

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

/* 常见问题解答区 (FAQ Section) */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-item:hover {
  border-color: rgba(0, 242, 254, 0.4);
}

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

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

.faq-summary::after {
  content: '+';
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--primary);
  transition: transform 0.3s ease;
}

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

.faq-content {
  padding: 0 26px 24px 26px;
  font-size: 0.96rem;
  color: var(--text-sub);
  line-height: 1.75;
}

/* 底部转化区 (CTA Section) */
.cta-banner {
  background: radial-gradient(circle at 50% 50%, rgba(0, 242, 254, 0.18) 0%, rgba(121, 40, 202, 0.14) 60%, transparent 100%),
              linear-gradient(180deg, #0e1428 0%, #060912 100%);
  border: 1px solid rgba(0, 242, 254, 0.35);
  border-radius: 28px;
  padding: 68px 32px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 0 60px rgba(0, 242, 254, 0.18);
}

.cta-banner h2 {
  font-size: 2.6rem;
  font-weight: 900;
  margin-bottom: 16px;
}

.cta-banner p {
  font-size: 1.1rem;
  color: var(--text-sub);
  max-width: 660px;
  margin: 0 auto 36px auto;
  line-height: 1.7;
}

.cta-banner .btn-primary {
  padding: 16px 44px;
  font-size: 1.15rem;
}

/* 页脚 (Footer) - 严格遵循只保留4个标题规范 */
.footer {
  border-top: 1px solid var(--border-color);
  background: #04060c;
  padding: 48px 0 36px 0;
  text-align: center;
}

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

.footer-nav-link {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-sub);
  position: relative;
  transition: var(--transition);
}

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

.footer-copy {
  font-size: 0.85rem;
  color: #64748b;
}

/* 移动端汉堡抽屉菜单 */
.mobile-drawer {
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  background: rgba(6, 9, 17, 0.98);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  padding: 24px;
  display: none;
  flex-direction: column;
  gap: 18px;
  z-index: 999;
}

.mobile-drawer.active {
  display: flex;
}

.mobile-drawer .nav-link {
  font-size: 1.1rem;
  padding: 8px 0;
}

.mobile-drawer .nav-actions-mobile {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 12px;
}

/* 响应式媒体查询 (@media) */
@media (max-width: 992px) {
  .hero-title {
    font-size: 2.6rem;
  }
  .cards-grid-3, .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }
  .media-ai-card {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .why-row {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .why-row:nth-child(2) {
    display: flex;
    flex-direction: column-reverse;
  }
}

@media (max-width: 768px) {
  .navbar .nav-menu, .navbar .nav-actions {
    display: none;
  }
  .menu-toggle {
    display: block;
  }
  .hero-section {
    padding-top: 110px;
    padding-bottom: 60px;
  }
  .hero-title {
    font-size: 2rem;
  }
  .hero-desc {
    font-size: 1rem;
  }
  .telemetry-ticker {
    gap: 10px;
    font-size: 0.78rem;
    padding: 8px 16px;
  }
  .hero-cta {
    flex-direction: column;
    width: 100%;
  }
  .hero-cta .btn {
    width: 100%;
    min-height: 48px;
  }
  .hero-features-bar {
    gap: 16px;
    flex-direction: column;
    align-items: flex-start;
  }
  .section-title {
    font-size: 1.75rem;
  }
  .cta-banner h2 {
    font-size: 1.85rem;
  }
  .footer-nav {
    gap: 20px;
  }
}