/* ========================================================
   流量光机场 - 品牌官网与技术落地页样式表
   主题风格：现代高质感科技 SaaS 风格 (珍珠米白 + 流量蓝 + 状态绿)
   基底背景：#F8F7F2
   主色调：#3788FF (流量蓝) / #0284C7 (天蓝) / #10B981 (专线绿)
   ======================================================== */

:root {
  --bg-primary: #F8F7F2;
  --bg-surface: #FFFFFF;
  --bg-surface-elevated: #FCFCF9;
  --bg-subtle: #F1EFEA;
  --border-light: #E7E4DC;
  --border-hover: #CBD5E1;

  --color-blue: #3788FF;
  --color-blue-dark: #1D4ED8;
  --color-cyan: #0EA5E9;
  --color-mint: #10B981;
  --color-mint-bg: #ECFDF5;
  --color-orange: #F97316;

  --text-main: #19202E;
  --text-secondary: #526075;
  --text-muted: #8A97AA;
  --text-inverse: #FFFFFF;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --shadow-sm: 0 2px 6px rgba(25, 32, 46, 0.04);
  --shadow-md: 0 8px 24px rgba(55, 136, 255, 0.08);
  --shadow-lg: 0 16px 40px rgba(55, 136, 255, 0.12);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 26px;
  --radius-pill: 9999px;

  --container-max: 1220px;
  --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.65;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(55, 136, 255, 0.035) 0%, transparent 40%),
    radial-gradient(circle at 85% 75%, rgba(14, 165, 233, 0.035) 0%, transparent 40%);
  background-attachment: fixed;
}

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

a:hover {
  color: var(--color-blue-dark);
}

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

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

.section-wrapper {
  padding: 76px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 46px auto;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(55, 136, 255, 0.08);
  color: var(--color-blue);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  margin-bottom: 16px;
  border: 1px solid rgba(55, 136, 255, 0.16);
  letter-spacing: 0.5px;
}

.section-badge-dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-mint);
  border-radius: 50%;
  box-shadow: 0 0 6px var(--color-mint);
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-main);
  margin-bottom: 14px;
  letter-spacing: -0.5px;
}

.section-title span.gradient-text {
  background: linear-gradient(135deg, var(--color-blue) 0%, #0284C7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-desc {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 11px 22px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition-smooth);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-blue) 0%, #2563EB 100%);
  color: #FFFFFF;
  box-shadow: 0 6px 18px rgba(55, 136, 255, 0.28);
}

.btn-primary:hover {
  color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(55, 136, 255, 0.38);
}

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

.btn-secondary:hover {
  border-color: var(--color-blue);
  color: var(--color-blue);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 7px 16px;
  font-size: 0.88rem;
}

.btn-lg {
  padding: 13px 28px;
  font-size: 1.02rem;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248, 247, 242, 0.94);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-light);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 20px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  flex-shrink: 0;
}

.brand-logo img {
  width: 36px;
  height: 36px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
  white-space: nowrap;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: var(--transition-smooth);
  padding: 4px 2px;
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

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

/* ========================================================
   Hero Section - 左右分栏结构 (Left-Right Grid)
   ======================================================== */
.hero-section {
  padding: 56px 0 60px 0;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.08fr 1.02fr;
  gap: 40px;
  align-items: center;
}

.hero-content {
  text-align: left;
}

.hero-badge-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  font-weight: 600;
  border: 1px solid transparent;
}

.badge-blue {
  background: rgba(55, 136, 255, 0.08);
  color: var(--color-blue);
  border-color: rgba(55, 136, 255, 0.2);
}

.badge-green {
  background: #ECFDF5;
  color: #065F46;
  border-color: #A7F3D0;
}

.status-indicator-dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-mint);
  border-radius: 50%;
  position: relative;
  box-shadow: 0 0 6px var(--color-mint);
  flex-shrink: 0;
}

.status-indicator-dot.pulse::after {
  content: "";
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  border: 1.5px solid var(--color-mint);
  animation: pulseAnim 1.8s infinite;
}

@keyframes pulseAnim {
  0% { transform: scale(0.8); opacity: 1; }
  100% { transform: scale(2.2); opacity: 0; }
}

.hero-title {
  font-size: 2.9rem;
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -1px;
  margin-bottom: 20px;
  color: var(--text-main);
}

.hero-title .highlight-blue {
  background: linear-gradient(135deg, var(--color-blue) 0%, #0284C7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 28px;
}

.hero-action-group {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

.hero-trust-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  padding: 16px 20px;
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.trust-item {
  display: flex;
  flex-direction: column;
}

.trust-item-value {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--color-blue);
  font-family: var(--font-mono);
  line-height: 1.2;
}

.trust-item-label {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ========================================================
   Hero Right Side: 新版全息科技测速仪表盘 (Cockpit & Visual Artwork)
   ======================================================== */
.hero-dashboard-wrap {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

/* 顶部匹配插入的 3D 科技视觉图卡片 */
.hero-visual-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-light);
  background: #FFFFFF;
  height: 220px;
}

.hero-telemetry-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero-visual-overlay-badge {
  position: absolute;
  top: 14px;
  left: 14px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 700;
  color: #065F46;
  border: 1px solid #A7F3D0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

/* 下方综合测速仪表舱 */
.node-dashboard-cockpit {
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  box-shadow: 0 16px 40px rgba(55, 136, 255, 0.08);
  padding: 24px;
}

.cockpit-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-light);
  flex-wrap: wrap;
  gap: 12px;
}

.cockpit-title-group {
  display: flex;
  flex-direction: column;
}

.cockpit-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.3;
}

.cockpit-subtitle {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

/* 4 宫格测速指标卡 */
.cockpit-metrics-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 12px;
  margin-bottom: 20px;
}

.metric-box {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
}

.metric-box.main-metric {
  background: #F0F7FF;
  border-color: #BAE6FD;
}

.metric-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.metric-value-wrap {
  display: flex;
  align-items: baseline;
  gap: 3px;
  margin-bottom: 6px;
}

.metric-num {
  font-size: 1.45rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--text-main);
  line-height: 1;
}

.metric-box.main-metric .metric-num {
  color: var(--color-blue);
  font-size: 1.6rem;
}

.text-mint {
  color: var(--color-mint) !important;
}

.text-blue {
  color: var(--color-blue) !important;
}

.metric-unit {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.metric-bar-outer {
  width: 100%;
  height: 5px;
  background: #E2E8F0;
  border-radius: 4px;
  overflow: hidden;
}

.metric-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-blue), var(--color-cyan));
  border-radius: 4px;
  transition: width 0.6s ease;
}

.metric-sub-tag {
  font-size: 0.72rem;
  color: var(--color-mint);
  font-weight: 600;
}

/* 专线节点切换器 (Pills) */
.cockpit-node-selector {
  margin-bottom: 16px;
}

.selector-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.node-pill-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.node-pill-btn {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition-smooth);
}

.node-pill-btn:hover {
  border-color: var(--color-blue);
  color: var(--color-blue);
}

.node-pill-btn.active {
  background: var(--color-blue);
  color: #FFFFFF;
  border-color: var(--color-blue);
  box-shadow: 0 4px 12px rgba(55, 136, 255, 0.3);
}

.node-pill-code {
  display: inline-block;
  padding: 1px 6px;
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.08);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
}

.node-pill-btn.active .node-pill-code {
  background: rgba(255, 255, 255, 0.25);
  color: #FFFFFF;
}

/* 底部状态日志条 */
.cockpit-bottom-log {
  padding-top: 14px;
  border-top: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* ========================================================
   Core Advantages Section (核心优势)
   ======================================================== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.advantage-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-smooth);
}

.advantage-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-blue);
}

.advantage-icon-badge {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(55, 136, 255, 0.08);
  color: var(--color-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.advantage-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
}

.advantage-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ========================================================
   Pricing Section (套餐选购 - 现代高性价比卡片)
   ======================================================== */
.pricing-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.pricing-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 28px 22px;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: var(--transition-smooth);
}

.pricing-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-blue);
}

.pricing-card.popular {
  border-color: var(--color-blue);
  box-shadow: 0 10px 32px rgba(55, 136, 255, 0.14);
}

.pricing-badge-popular {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--color-blue), #2563EB);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 12px;
  border-radius: var(--radius-pill);
}

.pricing-plan-name {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 6px;
}

.pricing-plan-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  min-height: 40px;
}

.pricing-price-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 16px;
}

.pricing-currency {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
}

.pricing-amount {
  font-size: 2.6rem;
  font-weight: 900;
  font-family: var(--font-mono);
  color: var(--text-main);
  line-height: 1;
}

.pricing-period {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.pricing-traffic-tag {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  background: #F1F5F9;
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-blue);
  margin-bottom: 20px;
}

.pricing-features-list {
  list-style: none;
  margin-bottom: 24px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.pricing-feature-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.check-svg-icon {
  color: var(--color-mint);
  flex-shrink: 0;
}

/* ========================================================
   Target Audience Section (适合人群)
   ======================================================== */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.audience-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 26px 20px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-smooth);
}

.audience-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-blue);
}

.audience-icon-box {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: rgba(55, 136, 255, 0.08);
  color: var(--color-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px auto;
}

.audience-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.audience-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ========================================================
   Clash / Clash Party Tutorials & Multi-device Visual
   ======================================================== */
.tutorial-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 36px;
  box-shadow: var(--shadow-sm);
}

.tutorial-banner-card {
  margin-bottom: 28px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-light);
  max-height: 260px;
}

.tutorial-banner-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.tutorial-tabs {
  display: flex;
  gap: 12px;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 16px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.tutorial-tab-btn {
  background: none;
  border: none;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-secondary);
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.tutorial-tab-btn.active {
  background: var(--color-blue);
  color: #FFFFFF;
}

.tutorial-steps-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-bottom: 28px;
}

.step-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 22px;
}

.step-tag {
  display: inline-block;
  background: rgba(55, 136, 255, 0.1);
  color: var(--color-blue);
  font-size: 0.78rem;
  font-weight: 800;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  margin-bottom: 10px;
}

.step-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.step-text {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.cta-box-clean {
  background: #F8FAFC;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

/* ========================================================
   User Reviews & Testimonials
   ======================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.review-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-stars-bar {
  display: flex;
  gap: 4px;
  margin-bottom: 12px;
}

.review-text {
  font-size: 0.92rem;
  color: var(--text-main);
  line-height: 1.65;
  margin-bottom: 18px;
}

.review-author-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.review-avatar-text {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #EEF2FF;
  color: var(--color-blue);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}

.review-author-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-main);
}

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

/* ========================================================
   FAQ Section
   ======================================================== */
.faq-container {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

.faq-item.open {
  border-color: var(--color-blue);
  box-shadow: 0 4px 16px rgba(55, 136, 255, 0.08);
}

.faq-question-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-main);
  transition: var(--transition-smooth);
}

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

.faq-icon-arrow {
  font-size: 0.85rem;
  transition: transform 0.25s ease;
  color: var(--color-blue);
}

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

.faq-answer-content {
  display: none;
  padding: 0 22px 20px 22px;
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.7;
  border-top: 1px solid rgba(231, 228, 220, 0.5);
  margin-top: 4px;
}

.faq-item.open .faq-answer-content {
  display: block;
}

/* ========================================================
   Articles Catalog & SEO Articles Grid
   ======================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.article-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: var(--transition-smooth);
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-blue);
}

.article-card-cover {
  height: 140px;
  background: linear-gradient(135deg, #EEF2FF 0%, #E0F2FE 100%);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.article-category-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(255, 255, 255, 0.95);
  color: var(--color-blue);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
}

.article-card-body {
  padding: 22px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-card-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.article-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 10px;
  color: var(--text-main);
  transition: var(--transition-smooth);
}

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

.article-card-excerpt {
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}

.article-readmore-link {
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--color-blue);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ========================================================
   Article Detail Page Styles
   ======================================================== */
.article-detail-header {
  padding: 50px 0 32px 0;
  background: linear-gradient(180deg, rgba(55, 136, 255, 0.04) 0%, transparent 100%);
}

.breadcrumbs-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.breadcrumbs-nav a {
  color: var(--text-secondary);
}

.breadcrumbs-nav a:hover {
  color: var(--color-blue);
}

.article-detail-title {
  font-size: 2.3rem;
  font-weight: 900;
  line-height: 1.3;
  color: var(--text-main);
  margin-bottom: 16px;
}

.article-detail-meta-bar {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 0.86rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-light);
}

.article-content-body {
  max-width: 840px;
  margin: 36px auto 54px auto;
  font-size: 1.02rem;
  line-height: 1.85;
  color: #2D3748;
}

.article-content-body h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 36px 0 14px 0;
  padding-bottom: 8px;
  border-bottom: 2px solid rgba(55, 136, 255, 0.15);
}

.article-content-body h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 26px 0 10px 0;
}

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

.article-content-body ul, .article-content-body ol {
  margin: 14px 0 22px 24px;
}

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

.article-callout-box {
  background: #F0F7FF;
  border-left: 4px solid var(--color-blue);
  padding: 18px 22px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 24px 0;
}

.article-callout-title {
  font-weight: 700;
  color: var(--color-blue);
  margin-bottom: 6px;
}

.article-table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 26px 0;
}

.styled-table {
  width: 100%;
  border-collapse: collapse;
  background: #FFFFFF;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  font-size: 0.92rem;
}

.styled-table th {
  background: #EEF4FF;
  color: var(--text-main);
  font-weight: 700;
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-light);
}

.styled-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-secondary);
}

.styled-table tr:last-child td {
  border-bottom: none;
}

.styled-table tr:hover {
  background: #F8FAFC;
}

/* Article bottom CTA */
.article-footer-cta {
  background: linear-gradient(135deg, #19202E 0%, #0F172A 100%);
  color: #FFFFFF;
  border-radius: var(--radius-xl);
  padding: 36px;
  text-align: center;
  margin: 44px 0;
}

.article-footer-cta h3 {
  font-size: 1.75rem;
  margin-bottom: 10px;
  color: #FFFFFF;
}

.article-footer-cta p {
  color: #94A3B8;
  max-width: 600px;
  margin: 0 auto 22px auto;
}

.related-articles-section {
  margin-top: 50px;
  padding-top: 36px;
  border-top: 1px solid var(--border-light);
}

/* ========================================================
   Footer
   ======================================================== */
.site-footer {
  background: #171B24;
  color: #94A3B8;
  padding: 56px 0 28px 0;
  border-top: 1px solid #232A38;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1.2fr;
  gap: 36px;
  margin-bottom: 40px;
}

.footer-brand-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.2rem;
  font-weight: 800;
  color: #FFFFFF;
  margin-bottom: 14px;
}

.footer-brand-title img {
  width: 32px;
  height: 32px;
}

.footer-brand-desc {
  font-size: 0.88rem;
  line-height: 1.7;
  color: #94A3B8;
  margin-bottom: 18px;
}

.footer-col-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 18px;
  position: relative;
}

.footer-col-title::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 24px;
  height: 2px;
  background: var(--color-blue);
}

.footer-link-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link-list a {
  font-size: 0.86rem;
  color: #94A3B8;
  transition: var(--transition-smooth);
}

.footer-link-list a:hover {
  color: #38BDF8;
  padding-left: 4px;
}

.footer-bottom-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid #232A38;
  font-size: 0.82rem;
  color: #64748B;
  flex-wrap: wrap;
  gap: 14px;
}

.footer-legal-links {
  display: flex;
  gap: 18px;
}

.footer-legal-links a {
  color: #64748B;
}

.footer-legal-links a:hover {
  color: #CBD5E1;
}

/* Floating Action Button */
.floating-cta-btn {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 999;
  background: linear-gradient(135deg, var(--color-blue), #2563EB);
  color: #FFFFFF;
  padding: 11px 20px;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 8px 24px rgba(55, 136, 255, 0.4);
  transition: var(--transition-smooth);
  border: 1px solid rgba(255, 255, 255, 0.25);
}

.floating-cta-btn:hover {
  color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(55, 136, 255, 0.5);
}

/* ========================================================
   Responsive Media Queries
   ======================================================== */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .hero-title { font-size: 2.5rem; }
  .cockpit-metrics-grid { grid-template-columns: 1fr 1fr; }
  .advantages-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-cards-grid { grid-template-columns: repeat(2, 1fr); }
  .audience-grid { grid-template-columns: repeat(2, 1fr); }
  .articles-grid { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .hero-title { font-size: 2rem; }
  .section-title { font-size: 1.8rem; }
  .nav-links {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: #FFFFFF;
    flex-direction: column;
    padding: 20px;
    gap: 16px;
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-md);
    display: none;
  }
  .nav-links.mobile-open {
    display: flex;
  }
  .nav-toggle-btn {
    display: block;
  }
  .header-actions .btn-sm {
    display: none;
  }
  .cockpit-metrics-grid { grid-template-columns: 1fr; }
  .advantages-grid,
  .pricing-cards-grid,
  .audience-grid,
  .articles-grid,
  .reviews-grid,
  .tutorial-steps-container {
    grid-template-columns: 1fr;
  }
  .footer-grid { grid-template-columns: 1fr; }
  .floating-cta-btn {
    bottom: 18px;
    right: 18px;
    padding: 9px 16px;
    font-size: 0.85rem;
  }
}