/* ----------------------------------------------------
 * 一枝红杏官网 (yzhx.homes) - 核心CSS设计系统
 * 风格：新中式赛博科技 (Neo-Chinese Cyberpunk)
 * 布局：流式/自适应响应式布局 (Fluid & Adaptive)
 * ---------------------------------------------------- */

:root {
  /* 颜色系统 Color Tokens */
  --bg-darkest: #050608;
  --bg-main: #090b10;
  --bg-card: rgba(14, 18, 27, 0.68);
  --bg-card-hover: rgba(22, 28, 42, 0.85);
  --bg-glass: rgba(255, 255, 255, 0.03);

  /* 主色：霓虹赤红 (朱红杏花) & 赛博青蓝 (冷暖撞色) */
  --crimson-primary: #ff2a5f;
  --crimson-glow: rgba(255, 42, 95, 0.45);
  --crimson-bright: #ff4d79;

  --cyan-primary: #00f0ff;
  --cyan-glow: rgba(0, 240, 255, 0.35);
  --cyan-dark: #00a8b3;

  --amber-gold: #ffb703;
  --success-green: #10b981;

  /* 文字颜色 */
  --text-main: #f1f5f9;
  --text-sub: #94a3b8;
  --text-muted: #64748b;

  /* 边框与阴影 */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-crimson: rgba(255, 42, 95, 0.3);
  --border-cyan: rgba(0, 240, 255, 0.3);
  --shadow-neon-crimson: 0 0 25px rgba(255, 42, 95, 0.35);
  --shadow-neon-cyan: 0 0 25px rgba(0, 240, 255, 0.25);
  --shadow-card: 0 12px 40px rgba(0, 0, 0, 0.5);

  /* 字体 */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "Fira Code", JetBrains Mono, Consolas, Monaco, monospace;
}

/* 全局重置与流式基础布局 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-darkest);
  color: var(--text-main);
  font-family: var(--font-family);
  overflow-x: hidden;
}

body {
  width: 100%;
  min-height: 100vh;
  line-height: 1.6;
  background: radial-gradient(circle at 50% 0%, #150a14 0%, #090b10 60%, #050608 100%);
  background-attachment: fixed;
  overflow-x: hidden;
  position: relative;
}

/* 流式容器定义 (百分比拉伸 + clamp) */
.container {
  width: 92%;
  max-width: 1320px;
  margin: 0 auto;
  padding-left: clamp(0.75rem, 2vw, 1.5rem);
  padding-right: clamp(0.75rem, 2vw, 1.5rem);
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

/* 渐变文本工具 */
.gradient-text-crimson {
  background: linear-gradient(135deg, #ffffff 0%, #ff6b8b 50%, var(--crimson-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-text-cyan {
  background: linear-gradient(135deg, #ffffff 0%, #70e4ef 50%, var(--cyan-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-text-dual {
  background: linear-gradient(135deg, var(--crimson-bright) 0%, #ffffff 50%, var(--cyan-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* 赛博网格与背景 Canvas */
#hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
  opacity: 0.85;
}

.bg-pattern-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    radial-gradient(rgba(0, 240, 255, 0.05) 1px, transparent 1px),
    radial-gradient(rgba(255, 42, 95, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  background-position: 0 0, 20px 20px;
  z-index: 0;
  pointer-events: none;
}

/* 顶部粘性导航栏 Header Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  transition: all 0.3s ease;
  background: rgba(9, 11, 16, 0.7);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.navbar.scrolled {
  background: rgba(5, 6, 8, 0.92);
  border-bottom: 1px solid rgba(255, 42, 95, 0.25);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.8);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 1px;
}

.brand-icon-wrapper {
  position: relative;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: rgba(255, 42, 95, 0.1);
  border: 1px solid var(--border-crimson);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-neon-crimson);
  transition: transform 0.3s ease;
}

.brand-logo:hover .brand-icon-wrapper {
  transform: rotate(12deg) scale(1.05);
}

.brand-icon-wrapper img {
  width: 28px;
  height: 28px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.2vw, 2.2rem);
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-sub);
  position: relative;
  padding: 6px 0;
  transition: color 0.3s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: linear-gradient(90deg, var(--crimson-primary), var(--cyan-primary));
  transition: width 0.3s ease;
  box-shadow: 0 0 8px var(--crimson-primary);
}

.nav-link:hover, .nav-link.active {
  color: #ffffff;
}

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

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

/* 赛博风格按钮 Cyber Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0.65rem 1.4rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 8px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn-primary-glow {
  background: linear-gradient(135deg, var(--crimson-primary) 0%, #d90429 100%);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 0 20px rgba(255, 42, 95, 0.4);
}

.btn-primary-glow:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 35px rgba(255, 42, 95, 0.7);
  background: linear-gradient(135deg, #ff4d79 0%, #ff0033 100%);
}

.btn-cyan-outline {
  background: rgba(0, 240, 255, 0.05);
  color: var(--cyan-primary);
  border: 1px solid var(--border-cyan);
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.15);
}

.btn-cyan-outline:hover {
  background: rgba(0, 240, 255, 0.15);
  transform: translateY(-2px);
  box-shadow: 0 0 25px rgba(0, 240, 255, 0.4);
  color: #ffffff;
}

.mobile-toggle {
  display: none;
  font-size: 1.5rem;
  color: var(--text-main);
  padding: 8px;
}

/* ----------------------------------------------------
 * HERO 英雄主展示区
 * ---------------------------------------------------- */
.hero-section {
  position: relative;
  padding-top: 140px;
  padding-bottom: 90px;
  z-index: 2;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 16px;
  border-radius: 50px;
  background: rgba(255, 42, 95, 0.08);
  border: 1px solid var(--border-crimson);
  font-size: 0.88rem;
  color: var(--crimson-bright);
  margin-bottom: 24px;
  backdrop-filter: blur(8px);
}

.badge-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--crimson-primary);
  box-shadow: 0 0 10px var(--crimson-primary);
  animation: pulse-ring 1.8s infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(255, 42, 95, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 10px rgba(255, 42, 95, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(255, 42, 95, 0); }
}

.hero-title {
  font-size: clamp(2.2rem, 4.5vw, 3.8rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

.hero-slogan {
  font-size: clamp(1rem, 1.5vw, 1.25rem);
  color: var(--text-sub);
  margin-bottom: 36px;
  max-width: 620px;
  line-height: 1.8;
  border-left: 3px solid var(--crimson-primary);
  padding-left: 16px;
  background: linear-gradient(90deg, rgba(255, 42, 95, 0.06), transparent);
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 40px;
}

.btn-lg {
  padding: 0.9rem 2rem;
  font-size: 1.05rem;
  border-radius: 10px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}

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

.stat-value {
  font-size: 1.75rem;
  font-weight: 800;
  color: #ffffff;
  font-family: var(--font-mono);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* 英雄区右侧 赛博风磨砂代码墙与节点仪表卡片 */
.hero-visual-card {
  position: relative;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-cyan);
  border-radius: 20px;
  padding: 24px;
  box-shadow: var(--shadow-card), var(--shadow-neon-cyan);
  overflow: hidden;
}

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

.mac-dots {
  display: flex;
  gap: 8px;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.dot.red { background-color: #ff5f56; }
.dot.yellow { background-color: #ffbd2e; }
.dot.green { background-color: #27c93f; }

.terminal-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--cyan-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.code-wall-content {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--text-sub);
  line-height: 1.8;
}

.code-line {
  display: flex;
  gap: 12px;
}

.line-num {
  color: var(--text-muted);
  user-select: none;
}

.code-highlight-crimson { color: var(--crimson-bright); }
.code-highlight-cyan { color: var(--cyan-primary); }
.code-highlight-green { color: var(--success-green); }

/* Floating Live Node Ping Pill */
.hero-floating-pill {
  margin-top: 20px;
  padding: 12px 18px;
  background: rgba(0, 0, 0, 0.4);
  border-radius: 12px;
  border: 1px solid rgba(0, 240, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
}

.pill-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
}

.status-dot-active {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--success-green);
  box-shadow: 0 0 10px var(--success-green);
}

.ping-speed {
  color: var(--cyan-primary);
  font-weight: 700;
}

/* ----------------------------------------------------
 * 通用 Section 样式
 * ---------------------------------------------------- */
.section-padding {
  padding: 90px 0;
  position: relative;
  z-index: 2;
}

.section-header {
  text-align: center;
  max-width: 750px;
  margin: 0 auto 60px auto;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--cyan-primary);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 3.2vw, 2.75rem);
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.25;
}

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

/* ----------------------------------------------------
 * 板块1：核心优势 (Core Advantages)
 * ---------------------------------------------------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 32px;
  transition: all 0.35s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--crimson-primary), transparent);
  opacity: 0;
  transition: opacity 0.35s ease;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-crimson);
  box-shadow: var(--shadow-card), 0 0 30px rgba(255, 42, 95, 0.15);
  background: var(--bg-card-hover);
}

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

.feature-icon-box {
  width: 60px;
  height: 60px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(255, 42, 95, 0.12), rgba(0, 240, 255, 0.08));
  border: 1px solid var(--border-crimson);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: var(--crimson-bright);
  margin-bottom: 24px;
  transition: transform 0.3s ease;
}

.feature-card:hover .feature-icon-box {
  transform: scale(1.1) rotate(5deg);
  border-color: var(--cyan-primary);
  color: var(--cyan-primary);
}

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

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-sub);
  line-height: 1.65;
}

/* ----------------------------------------------------
 * 板块2：节点延迟与状态板块 (Node Dashboard)
 * ---------------------------------------------------- */
.nodes-dashboard-wrapper {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-cyan);
  border-radius: 20px;
  padding: 32px;
  box-shadow: var(--shadow-card), var(--shadow-neon-cyan);
}

.dashboard-header-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 28px;
}

.dash-title-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.dash-live-badge {
  padding: 4px 12px;
  border-radius: 20px;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.4);
  color: var(--success-green);
  font-size: 0.8rem;
  font-family: var(--font-mono);
  display: flex;
  align-items: center;
  gap: 6px;
}

.nodes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.node-card {
  background: rgba(7, 9, 14, 0.7);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 18px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all 0.3s ease;
}

.node-card:hover {
  border-color: var(--border-cyan);
  background: rgba(14, 19, 29, 0.9);
  transform: scale(1.02);
}

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

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

.node-name {
  font-weight: 600;
  font-size: 0.98rem;
  color: #ffffff;
}

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

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

.node-latency {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--success-green);
}

.node-latency.medium { color: var(--amber-gold); }

.node-stability {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ----------------------------------------------------
 * 板块3：套餐价格板块 (Pricing Plans)
 * ---------------------------------------------------- */
.pricing-toggle-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 50px;
}

.toggle-label {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-sub);
}

.toggle-label.active {
  color: #ffffff;
}

.switch-btn {
  position: relative;
  width: 60px;
  height: 32px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  border: 1px solid var(--border-crimson);
  transition: background 0.3s ease;
}

.switch-btn::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 4px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--crimson-primary);
  box-shadow: 0 0 10px var(--crimson-primary);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.switch-btn.active::after {
  transform: translateX(26px);
  background: var(--cyan-primary);
  box-shadow: 0 0 10px var(--cyan-primary);
}

.discount-tag {
  background: rgba(255, 42, 95, 0.15);
  color: var(--crimson-bright);
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 10px;
  border: 1px solid var(--border-crimson);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  align-items: stretch;
}

.price-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.35s ease;
  position: relative;
}

.price-card.popular {
  border-color: var(--crimson-primary);
  box-shadow: var(--shadow-card), var(--shadow-neon-crimson);
  background: linear-gradient(180deg, rgba(255, 42, 95, 0.08) 0%, rgba(14, 18, 27, 0.85) 100%);
  transform: scale(1.03);
}

.popular-badge {
  position: absolute;
  top: -14px;
  right: 28px;
  background: linear-gradient(90deg, var(--crimson-primary), #d90429);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 12px;
  letter-spacing: 1px;
  box-shadow: 0 0 15px var(--crimson-glow);
}

.plan-name {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 8px;
  color: #ffffff;
}

.plan-desc {
  font-size: 0.88rem;
  color: var(--text-sub);
  margin-bottom: 24px;
  min-height: 42px;
}

.price-display {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 28px;
}

.price-currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--crimson-bright);
}

.price-amount {
  font-size: 2.8rem;
  font-weight: 900;
  font-family: var(--font-mono);
  color: #ffffff;
}

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

.plan-features-list {
  list-style: none;
  margin-bottom: 36px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-sub);
}

.plan-feature-item i {
  color: var(--cyan-primary);
  font-size: 1rem;
}

/* ----------------------------------------------------
 * 板块4：用户评价板块 (User Reviews)
 * ---------------------------------------------------- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.review-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s ease;
}

.review-card:hover {
  border-color: var(--border-cyan);
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

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

.review-content {
  font-size: 0.95rem;
  color: var(--text-sub);
  line-height: 1.7;
  margin-bottom: 24px;
  font-style: italic;
}

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

.user-avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--crimson-primary), var(--cyan-primary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #ffffff;
  border: 2px solid rgba(255, 255, 255, 0.1);
}

.user-name {
  font-weight: 700;
  font-size: 0.98rem;
  color: #ffffff;
}

.user-role {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ----------------------------------------------------
 * 板块5：知识库与教程板块 (Knowledge Base & 8 SEO Articles)
 * ---------------------------------------------------- */
.kb-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}

.article-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s ease;
  cursor: pointer;
}

.article-card:hover {
  border-color: var(--border-crimson);
  transform: translateY(-5px);
  box-shadow: 0 12px 35px rgba(255, 42, 95, 0.18);
  background: var(--bg-card-hover);
}

.article-tag {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--cyan-primary);
  font-family: var(--font-mono);
  margin-bottom: 12px;
  background: rgba(0, 240, 255, 0.08);
  padding: 3px 10px;
  border-radius: 6px;
  width: fit-content;
}

.article-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
  line-height: 1.4;
}

.article-summary {
  font-size: 0.88rem;
  color: var(--text-sub);
  line-height: 1.6;
  margin-bottom: 20px;
}

.article-footer-link {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--crimson-bright);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.2s ease;
}

.article-card:hover .article-footer-link {
  gap: 10px;
  color: var(--cyan-primary);
}

/* 知识库文章完整阅读 Modal (嵌入页面弹出) */
.article-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(4, 5, 8, 0.88);
  backdrop-filter: blur(24px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.article-modal-overlay.active {
  display: flex;
}

.article-modal-container {
  width: 100%;
  max-width: 900px;
  max-height: 90vh;
  background: var(--bg-main);
  border: 1px solid var(--border-crimson);
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.9), var(--shadow-neon-crimson);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

.article-modal-header {
  padding: 20px 28px;
  background: rgba(14, 18, 27, 0.9);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-close-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-sub);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: all 0.2s ease;
}

.modal-close-btn:hover {
  background: var(--crimson-primary);
  color: #ffffff;
}

.article-modal-body {
  padding: 32px 36px;
  overflow-y: auto;
  font-size: 1rem;
  color: var(--text-sub);
  line-height: 1.85;
}

.article-modal-body h1, .article-modal-body h2, .article-modal-body h3 {
  color: #ffffff;
  margin-top: 24px;
  margin-bottom: 14px;
}

.article-modal-body h1 { font-size: 1.8rem; border-bottom: 1px solid var(--border-subtle); padding-bottom: 12px; }
.article-modal-body h2 { font-size: 1.4rem; color: var(--cyan-primary); }
.article-modal-body h3 { font-size: 1.15rem; color: var(--crimson-bright); }

.article-modal-body p {
  margin-bottom: 16px;
}

.article-modal-body code {
  background: rgba(0, 240, 255, 0.08);
  color: var(--cyan-primary);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.article-modal-body pre {
  background: #040508;
  padding: 16px 20px;
  border-radius: 10px;
  border: 1px solid var(--border-subtle);
  overflow-x: auto;
  margin-bottom: 20px;
}

.article-internal-links {
  margin-top: 30px;
  padding: 20px;
  background: rgba(255, 42, 95, 0.05);
  border: 1px stroke var(--border-crimson);
  border-radius: 12px;
}

.article-internal-links h4 {
  color: #ffffff;
  margin-bottom: 10px;
}

.article-internal-links ul {
  list-style-type: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.article-internal-links a {
  color: var(--cyan-primary);
  text-decoration: underline;
  cursor: pointer;
}

.article-internal-links a:hover {
  color: var(--crimson-bright);
}

/* ----------------------------------------------------
 * 板块6：常见问题 FAQ (Accordion)
 * ---------------------------------------------------- */
.faq-container {
  max-width: 850px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  overflow: hidden;
  transition: border-color 0.3s ease;
}

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

.faq-question {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.faq-icon {
  font-size: 1.2rem;
  color: var(--cyan-primary);
  transition: transform 0.3s ease;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  padding: 0 24px;
  color: var(--text-sub);
  font-size: 0.95rem;
  line-height: 1.7;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1), padding 0.35s ease;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 24px 20px 24px;
}

/* ----------------------------------------------------
 * 页脚与底栏 Footer
 * ---------------------------------------------------- */
.footer {
  background: #040507;
  border-top: 1px solid var(--border-subtle);
  padding: 70px 0 30px 0;
  position: relative;
  z-index: 2;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 16px;
  line-height: 1.7;
  max-width: 320px;
}

.footer-col-title {
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 20px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--text-sub);
  transition: color 0.2s ease;
}

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

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* 移动端与响应式适配 Responsive Queries */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 50px;
  }

  .nav-menu {
    position: fixed;
    top: 76px;
    left: 0;
    width: 100%;
    background: rgba(6, 8, 12, 0.96);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 30px;
    gap: 20px;
    border-bottom: 1px solid var(--border-crimson);
    transform: translateY(-150%);
    transition: transform 0.35s ease;
  }

  .nav-menu.active {
    transform: translateY(0);
  }

  .mobile-toggle {
    display: block;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .hero-stats {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .pricing-grid, .reviews-grid, .features-grid, .kb-grid {
    grid-template-columns: 1fr;
  }
}