/* ==========================================================================
   WgetCloud Official Landing Page Stylesheet
   Pure Native CSS - Ultra Fast Sub-Second Loading (wget-cloud.best)
   Zero Heavy External JS Frameworks - Maximum Performance & SEO Score
   ========================================================================== */

:root {
  --bg-dark: #050814;
  --bg-surface: #0a0f24;
  --bg-card: rgba(14, 22, 48, 0.72);
  --bg-card-hover: rgba(22, 34, 70, 0.85);
  --bg-card-featured: rgba(18, 30, 68, 0.92);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-light: rgba(255, 255, 255, 0.14);
  --border-highlight: rgba(0, 242, 254, 0.5);
  
  --primary: #00f2fe;
  --primary-rgb: 0, 242, 254;
  --primary-dark: #0284c7;
  --secondary: #3b82f6;
  --accent-purple: #8b5cf6;
  --accent-pink: #ec4899;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 35px rgba(0, 242, 254, 0.28);
  --shadow-glow-purple: 0 0 35px rgba(139, 92, 246, 0.25);
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-main);
  scroll-behavior: smooth;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
  background: var(--bg-dark);
}

/* ==========================================================================
   DYNAMIC BACKGROUND (动态背景体系: Pure Native Animated Background)
   ========================================================================== */
.bg-dynamic-wrap {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}

#bg-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.85;
  display: block;
}

.dynamic-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.32;
  will-change: transform;
  pointer-events: none;
}

.dynamic-orb-1 {
  top: -10%;
  left: 15%;
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, rgba(0, 242, 254, 0.45) 0%, rgba(59, 130, 246, 0.15) 60%, transparent 80%);
  animation: orbFloat1 22s infinite alternate ease-in-out;
}

.dynamic-orb-2 {
  top: 40%;
  right: -5%;
  width: 650px;
  height: 650px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.35) 0%, rgba(236, 72, 153, 0.1) 60%, transparent 80%);
  animation: orbFloat2 26s infinite alternate ease-in-out;
}

.dynamic-orb-3 {
  bottom: -15%;
  left: 5%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0, 242, 254, 0.3) 0%, rgba(16, 185, 129, 0.12) 60%, transparent 80%);
  animation: orbFloat3 18s infinite alternate ease-in-out;
}

.cyber-grid-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.8) 0%, transparent 85%);
  -webkit-mask-image: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.8) 0%, transparent 85%);
}

@keyframes orbFloat1 {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(80px, 60px) scale(1.12); }
  100% { transform: translate(-60px, 110px) scale(0.92); }
}

@keyframes orbFloat2 {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-90px, -70px) scale(1.15); }
  100% { transform: translate(70px, 90px) scale(0.95); }
}

@keyframes orbFloat3 {
  0% { transform: translate(0, 0) scale(0.95); }
  50% { transform: translate(70px, -80px) scale(1.1); }
  100% { transform: translate(-50px, -40px) scale(1); }
}

/* ==========================================================================
   LAYOUT & CONTAINER
   ========================================================================== */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

.section-py {
  padding: 85px 0;
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 52px;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid rgba(0, 242, 254, 0.25);
  color: var(--primary);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 14px;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #ffffff;
  margin-bottom: 14px;
  line-height: 1.25;
}

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

/* ==========================================================================
   BUTTONS & CALL TO ACTION (CTA SPECIFICATION)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-size: 0.98rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #030816;
  font-weight: 700;
  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, 0.55);
  filter: brightness(1.08);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  border-color: var(--border-light);
  backdrop-filter: blur(10px);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 15px 32px;
  font-size: 1.08rem;
  border-radius: var(--radius-md);
}

.btn-block {
  width: 100%;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   HEADER & NAVBAR
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: rgba(5, 8, 20, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

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

.logo-link {
  display: flex;
  align-items: center;
  text-decoration: none;
  gap: 10px;
}

.logo-img {
  height: 38px;
  width: auto;
  display: block;
}

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

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
  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(--primary);
  transition: width 0.25s ease;
}

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

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

.mobile-menu-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 90px 0 70px;
  text-align: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid rgba(0, 242, 254, 0.28);
  color: var(--primary);
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 24px;
  box-shadow: 0 0 25px rgba(0, 242, 254, 0.15);
}

.hero-pill-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 10px var(--primary);
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0% { transform: scale(0.9); opacity: 0.6; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.6; }
}

.hero-title {
  font-size: 2.75rem;
  font-weight: 900;
  line-height: 1.26;
  letter-spacing: -0.02em;
  margin-bottom: 22px;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.hero-title-main {
  display: block;
  font-size: 0.95em;
  color: #ffffff;
  margin-bottom: 6px;
}

.hero-title-sub {
  display: inline-block;
  white-space: nowrap;
}

.text-gradient {
  background: linear-gradient(135deg, #ffffff 15%, var(--primary) 65%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 780px;
  margin: 0 auto 38px;
  line-height: 1.7;
}

.hero-subtitle strong {
  color: var(--text-main);
  font-weight: 600;
}

.hero-ctas {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 46px;
  flex-wrap: wrap;
}

.hero-trust {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 30px;
  flex-wrap: wrap;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  max-width: 860px;
  margin: 0 auto;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-dim);
  font-size: 0.9rem;
}

.trust-item svg {
  color: var(--primary);
  flex-shrink: 0;
}

/* ==========================================================================
   METRICS & STATS BAR
   ========================================================================== */
.stats-section {
  padding: 20px 0 50px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 26px 20px;
  text-align: center;
  backdrop-filter: blur(12px);
  transition: var(--transition);
}

.stat-card:hover {
  border-color: var(--border-highlight);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.stat-num {
  font-size: 2.2rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 4px;
  font-family: var(--font-mono);
}

.stat-num span {
  color: var(--primary);
  font-size: 1.5rem;
}

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

/* ==========================================================================
   CORE FEATURES GRID (核心优势)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 34px 28px;
  backdrop-filter: blur(12px);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-highlight);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

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

.feature-icon-wrap {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid rgba(0, 242, 254, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 20px;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
}

.feature-text {
  font-size: 0.94rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   LIVE NODE LATENCY SIMULATOR (节点实测体验)
   ========================================================================== */
.nodes-section {
  background: linear-gradient(180deg, transparent 0%, rgba(10, 15, 36, 0.7) 100%);
}

.nodes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-bottom: 30px;
}

.node-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  backdrop-filter: blur(10px);
  transition: var(--transition);
}

.node-card:hover {
  border-color: var(--border-highlight);
  transform: translateY(-2px);
}

.node-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.node-flag {
  font-size: 1.6rem;
  line-height: 1;
}

.node-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: #ffffff;
}

.node-type {
  font-size: 0.78rem;
  color: var(--text-dim);
}

.node-right {
  text-align: right;
}

.node-ping {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--success);
}

.node-status {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 5px;
  justify-content: flex-end;
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
}

/* ==========================================================================
   PRICING SECTION: STRICT HORIZONTAL ROW ("所有价格要同排")
   ========================================================================== */
.pricing-section {
  position: relative;
  padding: 95px 0 85px;
}

/* 4 Columns strictly in the same row on desktop view */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 34px 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: var(--transition);
  backdrop-filter: blur(16px);
}

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

.pricing-card.featured {
  background: var(--bg-card-featured);
  border: 1.5px solid var(--primary);
  box-shadow: 0 0 35px rgba(0, 242, 254, 0.22);
}

.pricing-card.featured:hover {
  box-shadow: 0 0 45px rgba(0, 242, 254, 0.45);
}

.badge-popular {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #030816;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 14px rgba(0, 242, 254, 0.4);
  white-space: nowrap;
}

.badge-top {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--accent-purple) 0%, #ec4899 100%);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 14px rgba(139, 92, 246, 0.4);
  white-space: nowrap;
}

.plan-header {
  margin-bottom: 20px;
  text-align: center;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 6px;
}

.plan-subtitle {
  font-size: 0.84rem;
  color: var(--text-dim);
}

.plan-price-wrap {
  text-align: center;
  padding: 16px 0 22px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 22px;
}

.plan-currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary);
  vertical-align: top;
}

.plan-price {
  font-size: 3.2rem;
  font-weight: 900;
  font-family: var(--font-mono);
  color: #ffffff;
  line-height: 1;
}

.plan-period {
  font-size: 0.92rem;
  color: var(--text-muted);
}

.plan-billing-note {
  display: block;
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-top: 6px;
}

.plan-features {
  list-style: none;
  margin-bottom: 28px;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 13px;
  line-height: 1.45;
}

.plan-feature-item svg {
  color: var(--primary);
  flex-shrink: 0;
  margin-top: 2px;
}

.plan-feature-item.highlight {
  color: #ffffff;
  font-weight: 600;
}

.plan-feature-item.highlight svg {
  color: #00f2fe;
}

.plan-feature-item strong {
  color: var(--primary);
}

.plan-cta {
  margin-top: auto;
}

/* ==========================================================================
   CLIENT & SETUP GUIDE (全平台客户端配置)
   ========================================================================== */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.client-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 26px 20px;
  text-align: center;
  transition: var(--transition);
}

.client-card:hover {
  border-color: var(--border-highlight);
  transform: translateY(-3px);
}

.client-icon {
  width: 50px;
  height: 50px;
  margin: 0 auto 14px;
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.client-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 4px;
}

.client-software {
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-bottom: 14px;
}

.client-link {
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.client-link:hover {
  text-decoration: underline;
}

/* ==========================================================================
   ARTICLES SHOWCASE (机场文章专栏与内部跳转)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  text-decoration: none;
}

.article-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-highlight);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.article-tag {
  display: inline-block;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: rgba(0, 242, 254, 0.1);
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 700;
  margin-bottom: 14px;
  align-self: flex-start;
}

.article-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.45;
  margin-bottom: 12px;
  transition: color 0.2s ease;
}

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

.article-excerpt {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
  font-size: 0.8rem;
  color: var(--text-dim);
}

.article-readmore {
  color: var(--primary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ==========================================================================
   USER REVIEWS / TESTIMONIALS (用户真实评价)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  backdrop-filter: blur(12px);
  transition: var(--transition);
}

.review-card:hover {
  border-color: var(--border-highlight);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.review-stars {
  color: #facc15;
  font-size: 1.1rem;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.review-content {
  font-size: 0.93rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
  font-style: italic;
}

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

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--secondary) 0%, var(--accent-purple) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #ffffff;
  font-size: 0.95rem;
}

.review-name {
  font-weight: 700;
  font-size: 0.92rem;
  color: #ffffff;
}

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

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

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: var(--border-light);
}

.faq-item.active {
  border-color: var(--border-highlight);
}

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

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

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

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  background: rgba(5, 8, 20, 0.4);
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 0 24px 22px;
}

.faq-answer p {
  font-size: 0.94rem;
  color: var(--text-muted);
  line-height: 1.75;
}

/* ==========================================================================
   OUTBOUND LINKS & AUTHORITATIVE RESOURCES (帮我做好外链)
   ========================================================================== */
.resources-section {
  padding: 40px 0 60px;
  border-top: 1px solid var(--border-color);
}

.resources-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.resource-card {
  background: rgba(14, 22, 48, 0.5);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  transition: var(--transition);
}

.resource-card:hover {
  border-color: var(--primary);
  background: rgba(22, 34, 70, 0.7);
  transform: translateY(-2px);
}

.resource-icon {
  width: 32px;
  height: 32px;
  color: var(--primary);
  flex-shrink: 0;
}

.resource-title {
  font-size: 0.88rem;
  font-weight: 700;
  color: #ffffff;
}

.resource-desc {
  font-size: 0.75rem;
  color: var(--text-dim);
}

/* ==========================================================================
   FOOTER SECTION
   ========================================================================== */
.site-footer {
  background: #02050e;
  border-top: 1px solid var(--border-color);
  padding: 65px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 14px;
  line-height: 1.65;
  max-width: 360px;
}

.footer-title {
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 18px;
}

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

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

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.88rem;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--primary);
  padding-left: 4px;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.82rem;
  color: var(--text-dim);
  flex-wrap: wrap;
  gap: 14px;
}

.footer-geo-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  font-size: 0.76rem;
  color: var(--text-dim);
}

/* ==========================================================================
   RESPONSIVE MEDIA QUERIES
   ========================================================================== */
@media (max-width: 1100px) {
  .hero-title {
    font-size: 2.3rem;
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid, .reviews-grid, .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .resources-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 860px) {
  .hero-title-sub {
    white-space: normal;
  }
}

@media (max-width: 768px) {
  .section-title {
    font-size: 1.85rem;
  }
  .hero-title {
    font-size: 1.95rem;
  }
  .hero-subtitle {
    font-size: 1rem;
  }
  .nav-menu {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .features-grid, .reviews-grid, .articles-grid, .nodes-grid, .stats-grid, .clients-grid, .resources-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.6rem;
  }
}