/* ==========================================================================
   贝贝云导航页 (beibeiyunjc.top) - 核心样式表
   主题风格：潮流赛博 / 搞怪吸睛 / 极速动效 / 稳重居中布局
   ========================================================================== */

:root {
  /* 调色板 - 醒目搞怪高对比色彩 */
  --bg-body: #070a12;
  --bg-surface: #0f172a;
  --bg-card: #162036;
  --bg-card-hover: #1e2c4a;
  --bg-glass: rgba(15, 23, 42, 0.85);

  --neon-yellow: #ffe600;
  --neon-yellow-hover: #fff04d;
  --neon-purple: #8b5cf6;
  --neon-purple-glow: rgba(139, 92, 246, 0.4);
  --neon-pink: #ff2a85;
  --neon-green: #00f59b;
  --neon-green-glow: rgba(0, 245, 155, 0.35);
  --neon-cyan: #00f0ff;
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-dark: #070a12;
  --border-subtle: #243452;
  --border-neon: #ffe600;

  --font-family: -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", "Courier New", monospace;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-pill: 9999px;

  --shadow-neon: 0 0 25px rgba(255, 230, 0, 0.28);
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.6);
  --shadow-hover: 0 20px 40px -15px rgba(0, 240, 255, 0.25);
  --transition-smooth: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
  background-color: var(--bg-body);
  color: var(--text-primary);
  font-family: var(--font-family);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  background: radial-gradient(circle at 50% 0%, #151e36 0%, #070a12 60%);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* 搞怪背景动态网格光效 */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

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

ul, ol {
  list-style: none;
}

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

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

/* 居中对称布局容器：稳重居中，两侧留白 */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   头部固定吸顶导航栏
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 230, 0, 0.15);
  transition: var(--transition-smooth);
}

.site-header.scrolled {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
  border-bottom: 1px solid rgba(255, 230, 0, 0.3);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.4rem;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  text-decoration: none;
}

.brand-icon {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--neon-yellow), var(--neon-pink));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  box-shadow: 0 4px 15px rgba(255, 230, 0, 0.4);
  transform: rotate(-4deg);
  transition: transform 0.3s ease;
}

.brand-logo:hover .brand-icon {
  transform: rotate(12deg) scale(1.1);
}

.brand-name {
  color: var(--neon-yellow);
  font-weight: 900;
  text-shadow: 0 0 12px rgba(255, 230, 0, 0.3);
}

.brand-tag {
  background: rgba(139, 92, 246, 0.25);
  border: 1px solid var(--neon-purple);
  color: #c4b5fd;
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  font-weight: 600;
}

/* 导航链接 */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  padding: 8px 14px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: var(--transition-smooth);
}

.nav-link:hover, .nav-link.active {
  color: var(--neon-yellow);
  background: rgba(255, 230, 0, 0.08);
}

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

/* 移动端汉堡按钮 */
.mobile-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-size: 24px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   按钮通用样式 (极具眼球吸睛力)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  font-size: 1rem;
  font-weight: 800;
  border-radius: var(--radius-pill);
  transition: var(--transition-smooth);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, var(--neon-yellow) 0%, #ffc000 100%);
  color: var(--text-dark);
  box-shadow: 0 6px 20px rgba(255, 230, 0, 0.4);
  border: 2px solid #fff566;
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 10px 30px rgba(255, 230, 0, 0.65);
  background: linear-gradient(135deg, #fff04d 0%, var(--neon-yellow) 100%);
}

.btn-primary:active {
  transform: translateY(0) scale(0.98);
}

.btn-secondary {
  background: rgba(139, 92, 246, 0.15);
  color: #ddd6fe;
  border: 1.5px solid var(--neon-purple);
  box-shadow: 0 4px 15px rgba(139, 92, 246, 0.2);
}

.btn-secondary:hover {
  background: var(--neon-purple);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(139, 92, 246, 0.45);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.15rem;
  letter-spacing: 0.5px;
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.88rem;
}

/* 搞怪心跳动效 */
.pulse-anim {
  animation: pulse-glow 2s infinite ease-in-out;
}

@keyframes pulse-glow {
  0% { box-shadow: 0 0 15px rgba(255, 230, 0, 0.4); }
  50% { box-shadow: 0 0 35px rgba(255, 230, 0, 0.85), 0 0 15px rgba(255, 42, 133, 0.5); }
  100% { box-shadow: 0 0 15px rgba(255, 230, 0, 0.4); }
}

/* ==========================================================================
   Hero 首屏板块 - 贝贝云标语展示区 (极具搞怪吸睛效果)
   ========================================================================== */
.hero-section {
  padding-top: 150px;
  padding-bottom: 80px;
  text-align: center;
  position: relative;
}

.hero-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(255, 42, 133, 0.12);
  border: 1.5px dashed var(--neon-pink);
  padding: 6px 20px;
  border-radius: var(--radius-pill);
  color: #ff94c2;
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 24px;
  box-shadow: 0 0 20px rgba(255, 42, 133, 0.2);
  animation: float-badge 3s ease-in-out infinite;
}

@keyframes float-badge {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

.hero-title {
  font-size: clamp(2.4rem, 5.5vw, 4.2rem);
  font-weight: 950;
  line-height: 1.15;
  margin-bottom: 24px;
  letter-spacing: -1px;
}

.title-highlight-yellow {
  color: var(--neon-yellow);
  position: relative;
  display: inline-block;
  text-shadow: 0 0 30px rgba(255, 230, 0, 0.4);
}

.title-highlight-purple {
  background: linear-gradient(135deg, #a78bfa, #ec4899);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  color: var(--text-secondary);
  max-width: 780px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-subtitle strong {
  color: var(--neon-cyan);
}

.hero-cta-group {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-guarantee {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 28px;
  flex-wrap: wrap;
  color: #94a3b8;
  font-size: 0.9rem;
}

.guarantee-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.guarantee-item span.icon {
  color: var(--neon-green);
  font-weight: bold;
}

/* 数据悬浮小黑板 */
.hero-stats-bar {
  margin-top: 60px;
  background: linear-gradient(180deg, rgba(22, 32, 54, 0.8) 0%, rgba(15, 23, 42, 0.95) 100%);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 30px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  box-shadow: var(--shadow-card);
}

.stat-box {
  text-align: center;
  position: relative;
}

.stat-box:not(:last-child)::after {
  content: "";
  position: absolute;
  right: 0;
  top: 15%;
  height: 70%;
  width: 1px;
  background: rgba(255, 255, 255, 0.1);
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 900;
  font-family: var(--font-mono);
  color: var(--neon-yellow);
  line-height: 1.1;
  margin-bottom: 6px;
}

.stat-label {
  font-size: 0.88rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ==========================================================================
   通用板块标题与样式
   ========================================================================== */
.section-block {
  padding: 90px 0;
  position: relative;
}

.section-block::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 200px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 230, 0, 0.3), transparent);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--neon-yellow);
  background: rgba(255, 230, 0, 0.12);
  border: 1px solid rgba(255, 230, 0, 0.35);
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 14px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

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

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

.adv-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 34px 28px;
  position: relative;
  transition: var(--transition-smooth);
  overflow: hidden;
}

.adv-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--neon-yellow), var(--neon-purple));
  opacity: 0;
  transition: opacity 0.3s;
}

.adv-card:hover {
  transform: translateY(-8px);
  border-color: rgba(255, 230, 0, 0.5);
  box-shadow: 0 15px 35px -10px rgba(0, 0, 0, 0.6), 0 0 20px rgba(255, 230, 0, 0.15);
  background: var(--bg-card-hover);
}

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

.adv-icon-wrap {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
  margin-bottom: 22px;
  transition: transform 0.3s ease;
}

.adv-card:hover .adv-icon-wrap {
  transform: scale(1.15) rotate(6deg);
}

.adv-title {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: #ffffff;
}

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

.adv-pill {
  display: inline-block;
  margin-top: 18px;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: rgba(0, 240, 255, 0.1);
  color: var(--neon-cyan);
  border: 1px solid rgba(0, 240, 255, 0.25);
}

/* ==========================================================================
   2. 节点延迟与状态板块 (#nodes)
   ========================================================================== */
.nodes-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-card);
}

.nodes-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 16px;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.nodes-status-badge {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--neon-green);
  font-weight: 700;
}

.status-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--neon-green);
  box-shadow: 0 0 10px var(--neon-green);
  animation: blink-dot 1.8s infinite;
}

@keyframes blink-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.nodes-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.node-item {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition-smooth);
}

.node-item:hover {
  border-color: rgba(255, 230, 0, 0.35);
  background: rgba(15, 23, 42, 0.95);
  transform: translateX(4px);
}

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

.node-flag {
  font-size: 26px;
  line-height: 1;
}

.node-info h4 {
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 8px;
}

.node-unlock-tags {
  display: flex;
  gap: 6px;
  margin-top: 6px;
  flex-wrap: wrap;
}

.unlock-tag {
  font-size: 0.72rem;
  background: rgba(255, 255, 255, 0.06);
  color: #cbd5e1;
  padding: 2px 7px;
  border-radius: 4px;
}

.node-right {
  text-align: right;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
}

.node-ping {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--neon-green);
  display: flex;
  align-items: center;
  gap: 4px;
}

.node-ping.medium {
  color: var(--neon-yellow);
}

.node-bar {
  width: 70px;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
  overflow: hidden;
}

.node-bar-fill {
  height: 100%;
  background: var(--neon-green);
  border-radius: 3px;
  transition: width 0.6s ease;
}

/* ==========================================================================
   3. 套餐价格板块 (#pricing)
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1.5px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition-smooth);
}

.pricing-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 45px -10px rgba(0, 0, 0, 0.7);
}

.pricing-card.featured {
  border-color: var(--neon-yellow);
  background: linear-gradient(180deg, #1d273f 0%, #131b2e 100%);
  box-shadow: 0 10px 40px -10px rgba(255, 230, 0, 0.35);
  transform: scale(1.04);
}

.pricing-card.featured:hover {
  transform: scale(1.04) translateY(-10px);
  box-shadow: 0 25px 50px -10px rgba(255, 230, 0, 0.5);
}

.pricing-ribbon {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--neon-yellow), #ff9900);
  color: var(--text-dark);
  font-weight: 900;
  font-size: 0.82rem;
  padding: 4px 18px;
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 15px rgba(255, 230, 0, 0.5);
  white-space: nowrap;
}

.pricing-plan-name {
  font-size: 1.35rem;
  font-weight: 900;
  color: #ffffff;
  margin-bottom: 8px;
}

.pricing-plan-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  min-height: 42px;
}

.pricing-price-wrap {
  margin: 24px 0;
  padding: 18px 0;
  border-top: 1px dashed rgba(255, 255, 255, 0.1);
  border-bottom: 1px dashed rgba(255, 255, 255, 0.1);
}

.pricing-currency {
  font-size: 1.4rem;
  color: var(--neon-yellow);
  font-weight: 800;
  vertical-align: top;
}

.pricing-amount {
  font-size: 3.2rem;
  font-weight: 950;
  font-family: var(--font-mono);
  color: #ffffff;
  line-height: 1;
}

.pricing-card.featured .pricing-amount {
  color: var(--neon-yellow);
}

.pricing-period {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.pricing-features {
  margin-bottom: 32px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: #e2e8f0;
}

.feature-item .check {
  color: var(--neon-green);
  font-size: 1.1rem;
  flex-shrink: 0;
}

/* ==========================================================================
   4. 用户评价板块 (#reviews)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition-smooth);
}

.review-card:hover {
  transform: translateY(-6px);
  border-color: rgba(139, 92, 246, 0.5);
  box-shadow: 0 15px 35px -10px rgba(0, 0, 0, 0.6);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.review-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, #4f46e5, #ec4899);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}

.review-user-name {
  font-weight: 800;
  color: #ffffff;
  font-size: 1rem;
}

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

.review-stars {
  color: #fbbf24;
  font-size: 0.9rem;
  margin-bottom: 12px;
}

.review-text {
  color: #cbd5e1;
  font-size: 0.94rem;
  line-height: 1.65;
  font-style: italic;
}

.review-tag {
  margin-top: 18px;
  font-size: 0.75rem;
  color: var(--neon-cyan);
  background: rgba(0, 240, 255, 0.08);
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  display: inline-block;
  width: fit-content;
}

/* ==========================================================================
   5. 知识库与教程板块 (#tutorials)
   ========================================================================== */
.tutorials-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.tutorial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.tutorial-card:hover {
  transform: translateY(-8px);
  border-color: var(--neon-yellow);
  box-shadow: 0 15px 35px -10px rgba(0, 0, 0, 0.7), 0 0 20px rgba(255, 230, 0, 0.18);
  background: var(--bg-card-hover);
}

.tutorial-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.tutorial-tag {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: rgba(255, 230, 0, 0.12);
  color: var(--neon-yellow);
  border: 1px solid rgba(255, 230, 0, 0.25);
}

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

.tutorial-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.45;
  margin-bottom: 12px;
  transition: color 0.2s;
}

.tutorial-card:hover .tutorial-title {
  color: var(--neon-yellow);
}

.tutorial-summary {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.tutorial-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--neon-cyan);
  transition: gap 0.2s ease;
}

.tutorial-card:hover .tutorial-link-btn {
  gap: 10px;
  color: var(--neon-yellow);
}

/* ==========================================================================
   6. 常见问题板块 (#faq)
   ========================================================================== */
.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-item.active {
  border-color: rgba(255, 230, 0, 0.4);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}

.faq-question {
  padding: 22px 24px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: transparent;
  color: #ffffff;
  font-size: 1.05rem;
  font-weight: 700;
  text-align: left;
}

.faq-toggle-icon {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: transform 0.3s ease;
  flex-shrink: 0;
  margin-left: 14px;
}

.faq-item.active .faq-toggle-icon {
  transform: rotate(45deg);
  background: var(--neon-yellow);
  color: var(--text-dark);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
  padding: 0 24px;
  color: #cbd5e1;
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding-bottom: 22px;
  transition: max-height 0.4s ease-in-out;
}

/* ==========================================================================
   底栏 Footer
   ========================================================================== */
.site-footer {
  background: #05080e;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 70px 0 35px;
  margin-top: 60px;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 50px;
}

.footer-about p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-top: 16px;
  max-width: 320px;
  line-height: 1.7;
}

.footer-col h5 {
  font-size: 1rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 18px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

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

.footer-col a:hover {
  color: var(--neon-yellow);
}

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.footer-disclaimer {
  max-width: 600px;
  font-size: 0.8rem;
  color: #64748b;
  line-height: 1.5;
}

/* ==========================================================================
   文章详情页专有样式 (高质量知识库与排版)
   ========================================================================== */
.article-header-hero {
  padding-top: 140px;
  padding-bottom: 40px;
  text-align: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: radial-gradient(circle at 50% 0%, rgba(139, 92, 246, 0.15) 0%, transparent 70%);
}

.breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

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

.article-main-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 900;
  line-height: 1.25;
  margin-bottom: 20px;
  color: #ffffff;
}

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

.article-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 50px 24px;
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: #e2e8f0;
}

.article-body h2 {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--neon-yellow);
  margin: 44px 0 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid rgba(255, 230, 0, 0.2);
}

.article-body h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: #ffffff;
  margin: 28px 0 14px;
}

.article-body p {
  margin-bottom: 20px;
}

.article-body ul, .article-body ol {
  margin-bottom: 24px;
  padding-left: 24px;
}

.article-body ul li {
  list-style-type: disc;
  margin-bottom: 8px;
}

.article-body ol li {
  list-style-type: decimal;
  margin-bottom: 8px;
}

.article-callout {
  background: rgba(139, 92, 246, 0.12);
  border-left: 4px solid var(--neon-purple);
  padding: 18px 22px;
  border-radius: var(--radius-sm);
  margin: 26px 0;
  color: #cbd5e1;
}

.article-callout.tip {
  background: rgba(0, 245, 155, 0.1);
  border-left-color: var(--neon-green);
}

.article-callout.warning {
  background: rgba(255, 230, 0, 0.12);
  border-left-color: var(--neon-yellow);
  color: #fef08a;
}

.article-code-block {
  background: #0b1120;
  border: 1px solid #1e293b;
  border-radius: var(--radius-md);
  padding: 16px 20px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: #38bdf8;
  margin: 20px 0;
  overflow-x: auto;
}

.article-table-wrap {
  overflow-x: auto;
  margin: 26px 0;
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.article-table th, .article-table td {
  padding: 12px 16px;
  border: 1px solid #243452;
  text-align: left;
}

.article-table th {
  background: #162036;
  color: var(--neon-yellow);
  font-weight: 800;
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(22, 32, 54, 0.9) 0%, rgba(30, 41, 59, 0.9) 100%);
  border: 2px solid var(--neon-yellow);
  border-radius: var(--radius-lg);
  padding: 36px;
  text-align: center;
  margin: 60px 0 40px;
  box-shadow: 0 10px 30px rgba(255, 230, 0, 0.2);
}

.article-cta-title {
  font-size: 1.6rem;
  font-weight: 900;
  color: #ffffff;
  margin-bottom: 12px;
}

.article-cta-desc {
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.article-related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 30px;
}

/* ==========================================================================
   响应式断点适配 (移动端 & 平板)
   ========================================================================== */
@media (max-width: 1024px) {
  .advantages-grid, .pricing-grid, .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .tutorials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-8px);
  }
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 76px;
    left: 0;
    width: 100%;
    background: #0f172a;
    flex-direction: column;
    padding: 24px;
    gap: 12px;
    border-bottom: 1px solid var(--border-subtle);
    display: none;
  }
  .nav-menu.open {
    display: flex;
  }
  .mobile-toggle {
    display: block;
  }
  .advantages-grid, .nodes-grid, .pricing-grid, .reviews-grid, .tutorials-grid, .article-related-grid {
    grid-template-columns: 1fr;
  }
  .hero-stats-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
  .stat-box:nth-child(2)::after {
    display: none;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
  .hero-section {
    padding-top: 120px;
  }
  .article-header-hero {
    padding-top: 110px;
  }
}