/* ==========================================================================
   大哥云官网 (dageyun-jc.homes) - 浅色航空科技主题样式
   ========================================================================== */

:root {
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --primary-light: #e0f2fe;
  --primary-glow: rgba(2, 132, 199, 0.25);
  --accent: #2563eb;
  --accent-gradient: linear-gradient(135deg, #0284c7 0%, #2563eb 50%, #4f46e5 100%);
  --bg-main: #f8fafc;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-sub: #64748b;
  --border-light: rgba(226, 232, 240, 0.8);
  --border-glow: rgba(56, 189, 248, 0.35);
  --success: #10b981;
  --warning: #f59e0b;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.06), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 20px 40px -10px rgba(2, 132, 199, 0.12), 0 10px 15px -3px rgba(15, 23, 42, 0.04);
  --shadow-glow: 0 0 25px rgba(2, 132, 199, 0.35);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-tap-highlight-color: transparent;
}

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

/* ================= 动态背景与点缀微动画 ================= */
.bg-decorations {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
}

.cloud-blur {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.55;
  animation: floatOrb 20s infinite ease-in-out alternate;
}

.cloud-blur-1 {
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, rgba(186, 230, 253, 0.8) 0%, rgba(224, 242, 254, 0) 70%);
  top: -100px;
  left: -100px;
}

.cloud-blur-2 {
  width: 650px;
  height: 650px;
  background: radial-gradient(circle, rgba(199, 210, 254, 0.7) 0%, rgba(238, 242, 255, 0) 70%);
  top: 30%;
  right: -150px;
  animation-duration: 25s;
}

.cloud-blur-3 {
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(224, 242, 254, 0.8) 0%, rgba(240, 249, 255, 0) 70%);
  bottom: -150px;
  left: 10%;
  animation-duration: 30s;
}

.flight-track-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

@keyframes floatOrb {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, 30px) scale(1.08); }
  100% { transform: translate(-30px, -20px) scale(0.95); }
}

/* ================= 容器与布局 ================= */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

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

.section-title-wrap {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 55px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  margin-bottom: 14px;
  border: 1px solid rgba(2, 132, 199, 0.15);
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-main);
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 1.08rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ================= 顶部导航栏 (Navbar) ================= */
.header-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  transition: all 0.3s ease;
}

.header-nav.scrolled {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  background: rgba(255, 255, 255, 0.95);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 800;
  font-size: 1.35rem;
}

.logo-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.brand-logo .brand-text {
  display: flex;
  flex-direction: column;
}

.brand-logo .brand-title {
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.brand-logo .brand-badge {
  font-size: 0.65rem;
  background: #ecfdf5;
  color: #059669;
  border: 1px solid #a7f3d0;
  padding: 1px 6px;
  border-radius: 4px;
  font-weight: 700;
}

.brand-logo .brand-sub {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-sub);
}

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

.nav-link {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.95rem;
  transition: color 0.2s ease;
  position: relative;
  padding: 6px 0;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--accent-gradient);
  transition: width 0.3s ease;
  border-radius: 2px;
}

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

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

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-secondary {
  background: #fff;
  color: var(--text-main);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
  color: var(--primary);
}

.btn-primary {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(37, 99, 235, 0.4);
}

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

.btn-pulse::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(60deg, transparent, rgba(255, 255, 255, 0.25), transparent);
  transform: rotate(30deg);
  animation: shineBtn 4s infinite linear;
}

@keyframes shineBtn {
  0% { transform: translate(-100%, -100%) rotate(30deg); }
  20%, 100% { transform: translate(100%, 100%) rotate(30deg); }
}

/* 移动端菜单按钮 */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-main);
  cursor: pointer;
}

/* ================= Hero 首屏 ================= */
.hero-section {
  padding: 150px 0 80px;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 40px;
}

.hero-badge-live {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #ffffff;
  border: 1px solid rgba(2, 132, 199, 0.2);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  color: var(--text-muted);
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.ping-indicator {
  display: flex;
  align-items: center;
  gap: 6px;
  color: #059669;
  font-weight: 700;
  font-size: 0.85rem;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--success);
  box-shadow: 0 0 0 rgba(16, 185, 129, 0.4);
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -1.2px;
  margin-bottom: 22px;
  color: #0f172a;
}

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

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 35px;
  max-width: 600px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 45px;
  flex-wrap: wrap;
}

.hero-stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding-top: 25px;
  border-top: 1px solid var(--border-light);
}

.hero-stat-item h4 {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.2;
}

.hero-stat-item p {
  font-size: 0.85rem;
  color: var(--text-sub);
  margin-top: 4px;
}

/* Hero 右侧动态交互卡片 */
.hero-visual {
  position: relative;
}

.speedtest-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-lg);
  border: 1px solid #ffffff;
  box-shadow: var(--shadow-lg);
  padding: 30px;
  position: relative;
  z-index: 2;
  transition: transform 0.3s ease;
}

.speedtest-card:hover {
  transform: translateY(-5px);
}

.card-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 16px;
  margin-bottom: 22px;
}

.node-current {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
}

.node-flag {
  font-size: 1.4rem;
}

.speed-meter-wrap {
  text-align: center;
  padding: 20px 0;
}

.speed-number {
  font-size: 4rem;
  font-weight: 900;
  color: var(--accent);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  display: inline-block;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.speed-unit {
  font-size: 1.1rem;
  color: var(--text-sub);
  font-weight: 600;
  margin-top: 6px;
}

.speed-progress-bar {
  width: 100%;
  height: 8px;
  background: #e2e8f0;
  border-radius: var(--radius-full);
  margin: 20px 0;
  overflow: hidden;
  position: relative;
}

.speed-progress-fill {
  height: 100%;
  width: 92%;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
  animation: pulseWidth 3s infinite ease-in-out;
}

@keyframes pulseWidth {
  0% { width: 88%; }
  50% { width: 96%; }
  100% { width: 88%; }
}

.card-metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  background: #f8fafc;
  border-radius: var(--radius-md);
  padding: 14px;
  text-align: center;
}

.metric-box span {
  font-size: 0.75rem;
  color: var(--text-sub);
  display: block;
}

.metric-box strong {
  font-size: 1rem;
  color: var(--text-main);
  font-weight: 700;
}

.floating-badge {
  position: absolute;
  background: #ffffff;
  padding: 10px 18px;
  border-radius: var(--radius-full);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 0.85rem;
  z-index: 3;
}

.badge-stream {
  top: -15px;
  right: -10px;
  color: #e11d48;
}

.badge-security {
  bottom: -15px;
  left: -15px;
  color: #0284c7;
}

/* ================= 核心优势板块 ================= */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 35px 28px;
  box-shadow: var(--shadow-sm);
  transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
}

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

.feature-icon-box {
  width: 58px;
  height: 58px;
  border-radius: 16px;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 22px;
  transition: all 0.3s ease;
}

.feature-card:hover .feature-icon-box {
  background: var(--accent-gradient);
  color: #fff;
  transform: scale(1.08);
}

.feature-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

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

/* ================= 节点测速与状态板块 ================= */
.nodes-board {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 30px;
}

.nodes-board-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}

.nodes-status-summary {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.node-table-wrap {
  overflow-x: auto;
}

.node-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.node-table th {
  padding: 14px 18px;
  background: #f8fafc;
  color: var(--text-sub);
  font-weight: 600;
  font-size: 0.85rem;
  border-bottom: 1px solid var(--border-light);
}

.node-table td {
  padding: 18px;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.95rem;
  color: var(--text-main);
  vertical-align: middle;
}

.node-table tr:hover td {
  background-color: #f0f9ff;
}

.node-name-cell {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
}

.flag-box {
  font-size: 1.3rem;
}

.badge-tag {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
}

.tag-iepl {
  background: #e0f2fe;
  color: #0369a1;
}

.tag-stream {
  background: #fdf2f8;
  color: #be185d;
}

.tag-ai {
  background: #f5f3ff;
  color: #6d28d9;
}

.status-cell {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #059669;
  font-weight: 600;
}

.status-dot-mini {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
}

.ping-val {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: #0284c7;
}

/* ================= 套餐价格板块 ================= */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 35px 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-glow);
}

.pricing-card.popular {
  border: 2px solid var(--primary);
  box-shadow: var(--shadow-lg);
  background: #ffffff;
  transform: scale(1.03);
}

.pricing-card.popular:hover {
  transform: scale(1.03) translateY(-6px);
}

.popular-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-gradient);
  color: #fff;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.plan-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--text-sub);
  margin-bottom: 22px;
  min-height: 40px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-light);
}

.currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-main);
}

.price-num {
  font-size: 3rem;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1;
}

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

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

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

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

.pricing-footer-promise {
  text-align: center;
  margin-top: 40px;
  font-size: 0.95rem;
  color: var(--text-muted);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 30px;
  flex-wrap: wrap;
}

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

/* ================= 用户评价板块 ================= */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.3s ease;
}

.review-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  background: #ffffff;
}

.review-stars {
  color: #f59e0b;
  display: flex;
  gap: 3px;
  margin-bottom: 16px;
}

.review-content {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 24px;
  font-style: normal;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-light);
  padding-top: 16px;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--primary);
  font-size: 1.1rem;
}

.author-meta h5 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

.author-meta p {
  font-size: 0.8rem;
  color: var(--text-sub);
}

/* ================= 常见问题板块 (FAQ) ================= */
.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  overflow: hidden;
  transition: all 0.25s ease;
}

.faq-item:hover {
  border-color: #cbd5e1;
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  background: none;
  border: none;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  transition: color 0.2s ease;
}

.faq-question:hover {
  color: var(--primary);
}

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

.faq-item.active .faq-icon-arrow {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
}

.faq-answer-inner {
  padding: 0 24px 22px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.8;
  border-top: 1px solid rgba(241, 245, 249, 0.8);
}

/* ================= 知识库与教程板块 (Articles) ================= */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  text-decoration: none;
  color: inherit;
  position: relative;
}

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

.article-category {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-light);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
  width: fit-content;
}

.article-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.45;
  margin-bottom: 12px;
  transition: color 0.2s ease;
}

.article-card:hover .article-title {
  color: var(--primary);
}

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-light);
  padding-top: 14px;
  font-size: 0.82rem;
  color: var(--text-sub);
}

.article-read-btn {
  color: var(--primary);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.85rem;
}

/* ================= 底部 CTA 区域 ================= */
.cta-banner-section {
  padding: 70px 0;
}

.cta-banner-box {
  background: var(--accent-gradient);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(37, 99, 235, 0.25);
}

.cta-banner-box h2 {
  font-size: 2.3rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-banner-box p {
  font-size: 1.1rem;
  opacity: 0.9;
  max-width: 620px;
  margin: 0 auto 30px;
}

.cta-btn-white {
  background: #ffffff;
  color: var(--primary);
  font-size: 1.05rem;
  padding: 14px 34px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  font-weight: 700;
}

.cta-btn-white:hover {
  background: #f8fafc;
  transform: translateY(-3px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.18);
  color: var(--accent);
}

/* ================= 页脚 Footer ================= */
.site-footer {
  background: #ffffff;
  border-top: 1px solid var(--border-light);
  padding: 70px 0 30px;
  color: var(--text-muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 18px;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

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

.footer-bottom {
  border-top: 1px solid var(--border-light);
  padding-top: 25px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-sub);
}

.seo-meta-pills {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.seo-pill {
  background: #f1f5f9;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  color: var(--text-sub);
}

/* ================= 响应式适配 ================= */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-subtitle {
    margin: 0 auto 35px;
  }
  .hero-actions {
    justify-content: center;
  }
  .hero-stats-row {
    justify-content: center;
  }
  .features-grid, .reviews-grid, .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links, .nav-actions .btn-secondary {
    display: none;
  }
  .mobile-toggle {
    display: block;
  }
  .hero-title {
    font-size: 2.35rem;
  }
  .hero-stats-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  .features-grid, .reviews-grid, .articles-grid, .pricing-grid {
    grid-template-columns: 1fr;
  }
  .pricing-card.popular {
    transform: none;
  }
  .pricing-card.popular:hover {
    transform: translateY(-6px);
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}