/* ==========================================================================
   拼好连 (PinHaoLian) - 现代极速白金/科技清爽版模板 (Apple & Stripe 现代极简风)
   特点：纯原生 CSS，零重型框架，秒开性能，明亮清爽与高质感科技并存
   ========================================================================== */

:root {
  /* 清爽科技配色体系 (默认高对比度清爽白金模式) */
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --bg-subtle: #f1f5f9;
  --border-color: #e2e8f0;
  --border-hover: #93c5fd;

  --text-main: #0f172a;
  --text-muted: #1e293b;
  --text-dark: #334155;
  --text-light: #64748b;

  --primary: #0284c7;
  --primary-hover: #0369a1;
  --secondary: #4f46e5;
  --accent-gradient: linear-gradient(135deg, #0284c7 0%, #2563eb 50%, #4f46e5 100%);
  --accent-brand: linear-gradient(135deg, #00b4d8 0%, #0077b6 100%);
  --accent-warm: linear-gradient(135deg, #f59e0b 0%, #ea580c 100%);

  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.1);
  --warning: #f59e0b;

  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 20px 35px -10px rgba(15, 23, 42, 0.12), 0 12px 16px -8px rgba(15, 23, 42, 0.06);
  --shadow-primary: 0 8px 24px -4px rgba(2, 132, 199, 0.35);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 深色模式类 (支持用户一键切换) */
[data-theme="dark"] {
  --bg-main: #090d16;
  --bg-card: rgba(17, 24, 39, 0.85);
  --bg-card-hover: rgba(26, 36, 56, 0.95);
  --bg-subtle: #131c2e;
  --border-color: rgba(255, 255, 255, 0.09);
  --border-hover: rgba(56, 189, 248, 0.4);

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dark: #64748b;
  --text-light: #475569;

  --primary: #38bdf8;
  --primary-hover: #0ea5e9;
  --secondary: #818cf8;
  --accent-gradient: linear-gradient(135deg, #38bdf8 0%, #3b82f6 50%, #818cf8 100%);

  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 12px 28px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.6);
  --shadow-primary: 0 8px 25px rgba(56, 189, 248, 0.3);
}

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

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  overflow-x: hidden;
  background-color: var(--bg-main);
  background-image: 
    radial-gradient(at 15% 15%, rgba(2, 132, 199, 0.08) 0px, transparent 55%),
    radial-gradient(at 85% 20%, rgba(79, 70, 229, 0.08) 0px, transparent 50%),
    radial-gradient(at 50% 80%, rgba(16, 185, 129, 0.05) 0px, transparent 60%);
  background-attachment: fixed;
  transition: background-color 0.3s ease, color 0.3s ease;
}

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

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   Header & Modern Navigation
   ========================================================================== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 14px 0;
  transition: var(--transition);
}

[data-theme="dark"] .header {
  background: rgba(9, 13, 22, 0.85);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 850;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.logo-icon {
  width: 38px;
  height: 38px;
  background: var(--accent-gradient);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.15rem;
  font-weight: 900;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.35);
}

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

.nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
}

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

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

/* Theme Toggle Button (☀️/🌙 极简纯CSS/JS双模开关) */
.theme-toggle-btn {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: var(--radius-full);
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  transition: var(--transition);
}

.theme-toggle-btn:hover {
  background: var(--border-color);
  transform: rotate(15deg);
}

/* ==========================================================================
   Buttons & CTA
   ========================================================================== */
.btn, a.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
  border: none;
  text-decoration: none !important;
}

.btn-primary, a.btn-primary {
  background: var(--accent-gradient) !important;
  color: #ffffff !important;
  text-decoration: none !important;
  box-shadow: var(--shadow-primary);
}

.btn-primary:hover, a.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px -2px rgba(2, 132, 199, 0.5);
  color: #ffffff !important;
  text-decoration: none !important;
}

.btn-secondary, a.btn-secondary {
  background: var(--bg-card) !important;
  color: var(--text-main) !important;
  border: 1px solid var(--border-color) !important;
  box-shadow: var(--shadow-sm);
  text-decoration: none !important;
}

.btn-secondary:hover, a.btn-secondary:hover {
  background: var(--bg-subtle) !important;
  border-color: var(--border-hover) !important;
  transform: translateY(-2px);
  color: var(--primary) !important;
  text-decoration: none !important;
}

.btn-lg {
  padding: 14px 34px;
  font-size: 1.08rem;
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   Hero Section (Main Visual - 左右分布)
   ========================================================================== */
.hero {
  padding: 70px 0 65px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  background: rgba(2, 132, 199, 0.08);
  border: 1px solid rgba(2, 132, 199, 0.25);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 22px;
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  background: var(--success);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--success);
  animation: pulse-dot 1.8s infinite ease-in-out;
}

@keyframes pulse-dot {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-title {
  font-size: 3.1rem;
  font-weight: 850;
  line-height: 1.2;
  margin-bottom: 22px;
  letter-spacing: -1.2px;
  color: var(--text-main);
}

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

.hero-subtitle {
  font-size: 1.12rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 34px;
  max-width: 580px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.hero-guarantee {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 0.88rem;
  color: var(--text-dark);
  flex-wrap: wrap;
}

.guarantee-item {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
  font-weight: 500;
}

.guarantee-item svg {
  color: var(--success);
}

/* ==========================================================================
   Hero Right: Visual Speedometer HUD (全套极具冲击力的仪表盘)
   ========================================================================== */
.dynamic-card-wrapper {
  position: relative;
}

.dynamic-card-glow {
  position: absolute;
  inset: -15px;
  background: radial-gradient(circle, rgba(2, 132, 199, 0.15) 0%, rgba(79, 70, 229, 0.12) 50%, transparent 75%);
  filter: blur(28px);
  z-index: 0;
  border-radius: var(--radius-xl);
}

.live-status-card {
  position: relative;
  z-index: 1;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 26px;
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
}

.card-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 14px;
  margin-bottom: 18px;
}

.card-topbar-title {
  font-size: 0.96rem;
  font-weight: 750;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.live-indicator {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.76rem;
  font-weight: 750;
  color: var(--success);
  background: var(--success-bg);
  border: 1px solid rgba(16, 185, 129, 0.25);
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

/* 测速圆形仪表盘动效区 */
.speed-gauge-wrap {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.gauge-chart {
  display: flex;
  align-items: center;
  gap: 16px;
}

.gauge-svg {
  width: 68px;
  height: 68px;
}

.gauge-data {
  display: flex;
  flex-direction: column;
}

.gauge-data-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
}

.gauge-data-value {
  font-size: 1.65rem;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1.1;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.gauge-data-value small {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary);
}

.gauge-status-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  background: rgba(2, 132, 199, 0.1);
  color: var(--primary);
  border-radius: var(--radius-full);
}

/* 2 栏数据框 */
.radar-display {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}

.radar-stat-box {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 14px;
}

.stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.stat-value {
  font-size: 1.35rem;
  font-weight: 850;
  color: var(--text-main);
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.stat-value small {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}

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

.stat-value.green {
  color: var(--success);
}

/* 节点实时流 */
.live-nodes-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.node-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 0.86rem;
  transition: var(--transition);
}

.node-item:hover {
  border-color: var(--primary);
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

.node-info {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 650;
  color: var(--text-main);
}

.flag {
  font-size: 1.2rem;
}

.node-ping {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 750;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.ping-fast {
  color: var(--success);
}

.node-bar {
  width: 44px;
  height: 5px;
  background: #e2e8f0;
  border-radius: 3px;
  overflow: hidden;
}

[data-theme="dark"] .node-bar {
  background: rgba(255, 255, 255, 0.1);
}

.node-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #10b981, #0284c7);
  border-radius: 3px;
}

/* ==========================================================================
   Section Headers
   ========================================================================== */
.section {
  padding: 85px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 52px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  padding: 5px 14px;
  background: rgba(2, 132, 199, 0.08);
  border: 1px solid rgba(2, 132, 199, 0.2);
  border-radius: var(--radius-full);
  margin-bottom: 14px;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 850;
  color: var(--text-main);
  letter-spacing: -0.6px;
  margin-bottom: 16px;
  line-height: 1.25;
}

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

/* ==========================================================================
   Core Advantages (3 Feature Cards)
   ========================================================================== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.adv-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 34px 28px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  position: relative;
}

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

.adv-icon-wrap {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.12) 0%, rgba(79, 70, 229, 0.12) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--primary);
}

.adv-title {
  font-size: 1.28rem;
  font-weight: 750;
  color: var(--text-main);
  margin-bottom: 12px;
  line-height: 1.35;
}

.adv-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  flex-grow: 1;
}

.adv-card-meta {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
  font-size: 0.88rem;
  color: var(--primary);
  font-weight: 700;
}

/* ==========================================================================
   Streaming & AI Support Cards
   ========================================================================== */
.unlock-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
}

.unlock-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 34px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.unlock-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.unlock-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}

.unlock-icon {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-md);
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}

.unlock-title {
  font-size: 1.3rem;
  font-weight: 750;
  color: var(--text-main);
}

.unlock-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.86rem;
  color: var(--text-main);
  font-weight: 600;
  transition: var(--transition);
}

.badge-tag:hover {
  border-color: var(--primary);
  background: #ffffff;
}

.badge-tag.highlight {
  border-color: rgba(2, 132, 199, 0.4);
  background: rgba(2, 132, 199, 0.08);
  color: var(--primary);
  font-weight: 700;
}

/* ==========================================================================
   Pricing Table Section
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 30px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.pricing-card.popular {
  border: 2px solid var(--primary);
  box-shadow: 0 16px 36px -8px rgba(2, 132, 199, 0.25);
  transform: scale(1.03);
}

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

.popular-badge {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-gradient);
  color: #ffffff;
  font-size: 0.74rem;
  font-weight: 850;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.4);
  white-space: nowrap;
}

.pricing-name {
  font-size: 1.25rem;
  font-weight: 750;
  color: var(--text-main);
  margin-bottom: 6px;
}

.pricing-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  min-height: 42px;
  margin-bottom: 20px;
}

.pricing-price {
  margin-bottom: 22px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: baseline;
  gap: 2px;
}

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

.amount {
  font-size: 2.6rem;
  font-weight: 850;
  color: var(--text-main);
  line-height: 1;
}

.period {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-left: 4px;
}

.pricing-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 13px;
  margin-bottom: 28px;
  flex-grow: 1;
}

.pricing-features li {
  font-size: 0.9rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 10px;
}

.pricing-features li strong {
  color: var(--text-main);
}

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

/* ==========================================================================
   SEO Articles Grid Section (Step 3: 图卡形式在价格下方)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.article-card:hover {
  transform: translateY(-7px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  font-size: 0.8rem;
}

.article-category {
  padding: 4px 12px;
  background: rgba(2, 132, 199, 0.08);
  border: 1px solid rgba(2, 132, 199, 0.2);
  color: var(--primary);
  border-radius: var(--radius-full);
  font-weight: 700;
}

.article-date {
  color: var(--text-light);
}

.article-title {
  font-size: 1.15rem;
  font-weight: 750;
  color: var(--text-main);
  line-height: 1.45;
  margin-bottom: 12px;
  transition: var(--transition);
}

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

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.68;
  margin-bottom: 20px;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary);
}

.article-footer svg {
  transition: transform 0.2s ease;
}

.article-card:hover .article-footer svg {
  transform: translateX(5px);
}

/* ==========================================================================
   User Reviews (Testimonials)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 30px 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.review-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.review-stars {
  color: var(--warning);
  margin-bottom: 16px;
  display: flex;
  gap: 4px;
  font-size: 1.1rem;
}

.review-content {
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 22px;
}

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

.reviewer-avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #fff;
  font-size: 1.1rem;
  box-shadow: 0 4px 10px rgba(2, 132, 199, 0.3);
}

.reviewer-info h4 {
  font-size: 0.96rem;
  color: var(--text-main);
  font-weight: 700;
}

.reviewer-info p {
  font-size: 0.8rem;
  color: var(--text-light);
}

/* ==========================================================================
   FAQ Section (Accordion)
   ========================================================================== */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-item[open] {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.faq-question {
  padding: 20px 24px;
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
}

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

.faq-question::after {
  content: "+";
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--primary);
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-question::after {
  content: "−";
}

.faq-answer {
  padding: 0 24px 22px 24px;
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.75;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  background: #0b0f19;
  color: #f1f5f9;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 60px 0 40px;
  margin-top: 70px;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 36px;
  list-style: none;
  margin-bottom: 34px;
  flex-wrap: wrap;
}

.footer-nav-link {
  font-size: 1.02rem;
  font-weight: 600;
  color: #cbd5e1;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.footer-nav-link:hover {
  color: #38bdf8;
  background: rgba(255, 255, 255, 0.08);
}

.footer-divider {
  width: 100%;
  max-width: 820px;
  height: 1px;
  background: rgba(255, 255, 255, 0.1);
  margin: 0 auto 34px;
}

/* PBN Friendly Links & Copyright (Step 4) */
.footer-pbn-section {
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.footer-copyright {
  font-size: 0.88rem;
  color: #94a3b8;
  margin-bottom: 16px;
}

.pbn-statement {
  font-size: 0.88rem;
  color: #94a3b8;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.pbn-label {
  color: #cbd5e1;
  font-weight: 600;
}

.pbn-link {
  font-weight: 700;
  color: #38bdf8 !important; /* 显色高亮 */
  background: rgba(56, 189, 248, 0.12);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(56, 189, 248, 0.35);
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.pbn-link:hover {
  color: #00f2fe !important;
  background: rgba(0, 242, 254, 0.25);
  border-color: rgba(0, 242, 254, 0.6);
  box-shadow: 0 0 16px rgba(0, 242, 254, 0.4);
  text-decoration: underline;
  transform: translateY(-2px);
}

/* ==========================================================================
   Article Detail & Standalone Pages
   ========================================================================== */
.article-page {
  padding: 50px 0 85px;
}

.article-container {
  max-width: 880px;
  margin: 0 auto;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-dark);
  margin-bottom: 26px;
}

.breadcrumb a {
  color: var(--text-muted);
}

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

.article-header {
  margin-bottom: 36px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 26px;
}

.article-page-title {
  font-size: 2.3rem;
  font-weight: 850;
  line-height: 1.3;
  margin-bottom: 18px;
  color: var(--text-main);
}

.article-page-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.88rem;
  color: var(--text-dark);
  flex-wrap: wrap;
}

.article-content {
  font-size: 1.06rem;
  line-height: 1.88;
  color: var(--text-muted);
}

.article-content h2 {
  font-size: 1.65rem;
  font-weight: 750;
  color: var(--text-main);
  margin: 42px 0 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.article-content h3 {
  font-size: 1.3rem;
  font-weight: 650;
  color: var(--primary);
  margin: 30px 0 14px;
}

.article-content p {
  margin-bottom: 22px;
}

.article-content ul, .article-content ol {
  margin: 18px 0 26px 26px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.article-content a:not(.btn) {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 600;
}

.article-content a:not(.btn):hover {
  color: var(--primary-hover);
}

.article-cta-box {
  margin: 48px 0;
  padding: 34px;
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.08) 0%, rgba(79, 70, 229, 0.08) 100%);
  border: 1px solid rgba(2, 132, 199, 0.25);
  border-radius: var(--radius-lg);
  text-align: center;
}

.article-cta-box h3 {
  font-size: 1.45rem;
  color: var(--text-main);
  margin-bottom: 12px;
}

.article-cta-box p {
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 22px;
}

.article-cta-box a.btn,
.article-content a.btn,
.article-content a.btn-primary {
  background: var(--accent-gradient) !important;
  color: #ffffff !important;
  text-decoration: none !important;
  font-weight: 700 !important;
  box-shadow: 0 8px 24px -4px rgba(2, 132, 199, 0.45) !important;
}

.article-cta-box a.btn:hover,
.article-content a.btn:hover,
.article-content a.btn-primary:hover {
  color: #ffffff !important;
  text-decoration: none !important;
  box-shadow: 0 12px 30px -4px rgba(2, 132, 199, 0.65) !important;
  transform: translateY(-2px);
}

.info-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 42px;
  box-shadow: var(--shadow-sm);
  margin-top: 26px;
}

.info-card h2 {
  font-size: 1.55rem;
  color: var(--text-main);
  margin: 32px 0 16px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
}

.info-card h2:first-child {
  margin-top: 0;
}

.info-card p {
  color: var(--text-muted);
  line-height: 1.82;
  margin-bottom: 20px;
}

.info-card ul {
  margin: 18px 0 22px 26px;
  color: var(--text-muted);
}

.info-card li {
  margin-bottom: 10px;
}

/* ==========================================================================
   Responsive & Mobile-First Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .pricing-card.popular {
    transform: none;
  }
  .pricing-card.popular:hover {
    transform: translateY(-8px);
  }
}

@media (max-width: 860px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-title {
    font-size: 2.35rem;
  }
  .advantages-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .unlock-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .articles-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .reviews-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 440px;
    margin: 0 auto;
  }
  .nav-links {
    display: none;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 18px;
  }
  .hero-title {
    font-size: 2rem;
  }
  .hero-subtitle {
    font-size: 1rem;
  }
  .section-title {
    font-size: 1.8rem;
  }
  .btn-lg {
    width: 100%;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .footer-nav {
    flex-direction: column;
    gap: 14px;
  }
  .pbn-statement {
    flex-direction: column;
    gap: 12px;
  }
}