/* ==========================================================================
   云图导航页 (yuntujc.homes) - 水墨丹青与太虚云海写意科技主题样式
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Ma+Shan+Zheng&family=Noto+Serif+SC:wght@400;600;700;900&family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  /* 水墨核心调色板 */
  --ink-deep: #0f1216;         /* 焦墨 */
  --ink-primary: #1c2128;      /* 浓墨 */
  --ink-medium: #374151;       /* 重墨 */
  --ink-soft: #4b5563;         /* 淡墨 */
  --ink-light: #6b7280;        /* 清墨 */
  --ink-border: #d1d5db;       /* 墨线 */
  --ink-border-light: #e5e7eb; /* 极淡墨痕 */

  /* 太虚云海宣纸背景 */
  --bg-paper: #f8fafc;         /* 宣纸底色 */
  --bg-pure: #ffffff;          /* 纯净纸白 */
  --bg-card: rgba(255, 255, 255, 0.88);
  --bg-mist: #f1f5f9;          /* 云海微灰 */
  --bg-cloud: #e2e8f0;         /* 翻涌云雾 */

  /* 传统朱砂红印章 */
  --cinnabar-red: #c23531;     /* 正朱砂 */
  --cinnabar-dark: #9e2320;    /* 沉朱砂 */
  --cinnabar-light: #fbeae9;   /* 朱砂晕染 */
  --cinnabar-border: #e06a66;

  /* 空灵雾青 (辅助点缀) */
  --jade-tint: #2c6e7a;
  --jade-light: #e6f3f5;

  /* 阴影与质感 */
  --shadow-subtle: 0 4px 20px -2px rgba(15, 18, 22, 0.05);
  --shadow-card: 0 10px 30px -5px rgba(15, 18, 22, 0.08);
  --shadow-hover: 0 20px 40px -10px rgba(15, 18, 22, 0.14);
  --shadow-seal: 0 2px 8px rgba(194, 53, 49, 0.25);

  /* 字体族 */
  --font-calligraphy: 'Ma Shan Zheng', 'Noto Serif SC', STKaiti, KaiTi, serif;
  --font-serif: 'Noto Serif SC', Songti SC, SimSun, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 全局重置与基础样式 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  color: var(--ink-primary);
  background-color: var(--bg-paper);
  background-image: 
    radial-gradient(at 15% 15%, rgba(226, 232, 240, 0.4) 0px, transparent 50%),
    radial-gradient(at 85% 25%, rgba(194, 53, 49, 0.03) 0px, transparent 40%),
    radial-gradient(at 50% 80%, rgba(203, 213, 225, 0.5) 0px, transparent 60%);
  background-attachment: fixed;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 居中主体容器：稳重端庄，两侧留白 */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 28px;
}

/* 朱砂红印章徽章通用样式 */
.seal-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--cinnabar-red);
  background: var(--cinnabar-light);
  border: 1.5px solid var(--cinnabar-border);
  padding: 2px 10px;
  border-radius: 4px;
  letter-spacing: 1px;
  font-size: 0.85rem;
  box-shadow: inset 0 0 4px rgba(194, 53, 49, 0.12), var(--shadow-seal);
  position: relative;
  vertical-align: middle;
}

.seal-badge.square {
  padding: 3px 6px;
  border-width: 2px;
  border-radius: 3px;
  writing-mode: horizontal-tb;
  font-size: 0.8rem;
  line-height: 1.2;
}

.seal-badge.solid {
  background: var(--cinnabar-red);
  color: #ffffff;
  border-color: var(--cinnabar-dark);
}

/* 顶部固定导航条 (凝脂微透水墨质感) */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(209, 213, 219, 0.6);
  transition: var(--transition-normal);
}

.site-header .nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink-deep);
}

.brand-logo .logo-mark {
  font-family: var(--font-calligraphy);
  font-size: 1.9rem;
  letter-spacing: 2px;
  background: linear-gradient(135deg, var(--ink-deep) 0%, var(--ink-medium) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-logo .logo-desc {
  font-size: 0.8rem;
  color: var(--ink-light);
  border-left: 1px solid var(--ink-border);
  padding-left: 10px;
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

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

.nav-links a {
  text-decoration: none;
  color: var(--ink-medium);
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition-fast);
  position: relative;
  padding: 6px 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--cinnabar-red);
  transition: var(--transition-fast);
  transform: translateX(-50%);
}

.nav-links a:hover {
  color: var(--ink-deep);
}

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

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

/* 按钮通用体系 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition-normal);
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-cinnabar {
  background: linear-gradient(135deg, var(--cinnabar-red) 0%, var(--cinnabar-dark) 100%);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(194, 53, 49, 0.35);
}

.btn-cinnabar:hover {
  background: linear-gradient(135deg, #d33c38 0%, #ad2925 100%);
  box-shadow: 0 6px 20px rgba(194, 53, 49, 0.45);
  transform: translateY(-1px);
}

.btn-ink-outline {
  background: rgba(255, 255, 255, 0.7);
  border-color: var(--ink-border);
  color: var(--ink-primary);
}

.btn-ink-outline:hover {
  background: #ffffff;
  border-color: var(--ink-deep);
  color: var(--ink-deep);
  box-shadow: var(--shadow-subtle);
  transform: translateY(-1px);
}

.btn-lg {
  padding: 14px 34px;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

/* 移动端菜单按钮 */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--ink-primary);
  cursor: pointer;
}

/* ==========================================================================
   板块公用标题
   ========================================================================== */
.section {
  padding: 90px 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
  position: relative;
}

.section-tag {
  display: inline-block;
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-calligraphy);
  font-size: 2.8rem;
  color: var(--ink-deep);
  letter-spacing: 2px;
  margin-bottom: 14px;
  font-weight: 400;
  line-height: 1.3;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--ink-light);
  max-width: 640px;
  margin: 0 auto;
  font-family: var(--font-serif);
}

/* ==========================================================================
   Hero 首屏板块：水墨丹青与太虚云海拓扑球
   ========================================================================== */
.hero-section {
  padding: 70px 0 100px;
  position: relative;
  overflow: hidden;
}

.hero-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}

.hero-content {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 50px;
  align-items: center;
}

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

.hero-badge-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.hero-title {
  font-family: var(--font-calligraphy);
  font-size: 4rem;
  line-height: 1.18;
  color: var(--ink-deep);
  margin-bottom: 22px;
  letter-spacing: 3px;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.hero-title .highlight-red {
  color: var(--cinnabar-red);
  font-family: var(--font-calligraphy);
}

.hero-desc {
  font-size: 1.2rem;
  color: var(--ink-medium);
  line-height: 1.8;
  margin-bottom: 34px;
  font-family: var(--font-serif);
}

.hero-features-list {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 38px;
  list-style: none;
}

.hero-feature-item {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid var(--ink-border-light);
  padding: 6px 14px;
  border-radius: 30px;
  font-size: 0.9rem;
  color: var(--ink-medium);
  box-shadow: var(--shadow-subtle);
}

.hero-feature-item .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cinnabar-red);
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 480px;
}

/* 拓扑交互画布容器 */
.topology-sphere-container {
  position: relative;
  width: 440px;
  height: 440px;
}

#topologyCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

.sphere-overlay-badges {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.orbit-badge {
  position: absolute;
  animation: floatSlow 4s ease-in-out infinite alternate;
  pointer-events: auto;
}

.orbit-badge-1 { top: 10%; right: 10%; animation-delay: 0s; }
.orbit-badge-2 { bottom: 15%; left: 8%; animation-delay: 1.5s; }
.orbit-badge-3 { top: 60%; right: -2%; animation-delay: 2.8s; }

@keyframes floatSlow {
  0% { transform: translateY(0px) rotate(0deg); }
  100% { transform: translateY(-12px) rotate(1deg); }
}

/* ==========================================================================
   核心优势板块
   ========================================================================== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.advantage-card {
  background: var(--bg-card);
  border: 1px solid var(--ink-border-light);
  border-radius: var(--radius-md);
  padding: 36px 30px;
  position: relative;
  transition: var(--transition-normal);
  box-shadow: var(--shadow-subtle);
  overflow: hidden;
}

.advantage-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: transparent;
  transition: var(--transition-normal);
}

.advantage-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--ink-border);
}

.advantage-card:hover::before {
  background: linear-gradient(90deg, var(--cinnabar-red) 0%, transparent 100%);
}

.adv-icon-wrap {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-sm);
  background: var(--bg-paper);
  border: 1px solid var(--ink-border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 22px;
  color: var(--ink-deep);
}

.adv-card-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--ink-deep);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.adv-card-desc {
  font-size: 0.95rem;
  color: var(--ink-soft);
  line-height: 1.7;
}

/* ==========================================================================
   节点状态与延迟监控板块
   ========================================================================== */
.monitor-board {
  background: #ffffff;
  border: 1px solid var(--ink-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 34px;
}

.monitor-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--ink-border-light);
  padding-bottom: 20px;
  margin-bottom: 26px;
  flex-wrap: wrap;
  gap: 16px;
}

.monitor-status-summary {
  display: flex;
  align-items: center;
  gap: 20px;
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 600;
}

.pulse-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulseGreen 2s infinite;
}

@keyframes pulseGreen {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.nodes-table-wrap {
  overflow-x: auto;
}

.nodes-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.nodes-table th {
  padding: 14px 18px;
  font-size: 0.85rem;
  color: var(--ink-light);
  font-weight: 600;
  border-bottom: 1px solid var(--ink-border-light);
  background: var(--bg-paper);
}

.nodes-table td {
  padding: 18px;
  border-bottom: 1px solid var(--ink-border-light);
  font-size: 0.95rem;
  vertical-align: middle;
}

.nodes-table tr:hover td {
  background: rgba(248, 250, 252, 0.8);
}

.node-region {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  color: var(--ink-deep);
}

.node-flag {
  font-size: 1.4rem;
}

.ping-val {
  font-family: var(--font-sans);
  font-weight: 700;
  display: inline-flex;
  align-items: baseline;
  gap: 2px;
}

.ping-val.fast { color: #059669; }
.ping-val.med { color: #d97706; }

.ping-bar-container {
  width: 120px;
  height: 6px;
  background: #f1f5f9;
  border-radius: 4px;
  overflow: hidden;
}

.ping-bar {
  height: 100%;
  background: linear-gradient(90deg, #10b981 0%, #059669 100%);
  border-radius: 4px;
  transition: width 0.5s ease;
}

/* ==========================================================================
   套餐价格板块
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background: #ffffff;
  border: 1px solid var(--ink-border);
  border-radius: var(--radius-md);
  padding: 36px 26px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition-normal);
  box-shadow: var(--shadow-subtle);
}

.pricing-card.featured {
  border: 2px solid var(--cinnabar-red);
  transform: translateY(-8px);
  box-shadow: var(--shadow-card);
  background: linear-gradient(180deg, #fffdfd 0%, #ffffff 100%);
}

.featured-ribbon {
  position: absolute;
  top: -14px;
  right: 20px;
}

.pricing-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-hover);
}

.pricing-header {
  border-bottom: 1px solid var(--ink-border-light);
  padding-bottom: 24px;
  margin-bottom: 24px;
  text-align: center;
}

.plan-name {
  font-family: var(--font-calligraphy);
  font-size: 1.9rem;
  color: var(--ink-deep);
  margin-bottom: 6px;
}

.plan-subtitle {
  font-size: 0.85rem;
  color: var(--ink-light);
  margin-bottom: 18px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}

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

.amount {
  font-size: 3rem;
  font-weight: 800;
  color: var(--ink-deep);
  line-height: 1;
}

.period {
  font-size: 0.9rem;
  color: var(--ink-light);
}

.plan-features {
  list-style: none;
  margin-bottom: 30px;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--ink-medium);
  margin-bottom: 14px;
}

.plan-features li svg {
  color: var(--cinnabar-red);
  flex-shrink: 0;
}

.pricing-card .btn {
  width: 100%;
}

/* ==========================================================================
   用户评价板块
   ========================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--ink-border-light);
  border-radius: var(--radius-md);
  padding: 30px;
  position: relative;
  box-shadow: var(--shadow-subtle);
  transition: var(--transition-normal);
}

.testimonial-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
  border-color: var(--ink-border);
}

.testimonial-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

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

.avatar-seal {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--cinnabar-light);
  border: 1.5px solid var(--cinnabar-border);
  color: var(--cinnabar-red);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.1rem;
}

.user-meta h4 {
  font-size: 1rem;
  color: var(--ink-deep);
  font-weight: 700;
}

.user-meta p {
  font-size: 0.82rem;
  color: var(--ink-light);
}

.stars {
  color: #f59e0b;
  font-size: 0.95rem;
  letter-spacing: 2px;
}

.testimonial-content {
  font-size: 0.95rem;
  color: var(--ink-soft);
  line-height: 1.75;
  font-family: var(--font-serif);
}

/* ==========================================================================
   常见问题板块 (FAQ 手风琴)
   ========================================================================== */
.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--ink-border-light);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  transition: var(--transition-fast);
}

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

.faq-question {
  width: 100%;
  padding: 22px 26px;
  background: none;
  border: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  cursor: pointer;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink-deep);
  gap: 16px;
}

.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--ink-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: var(--ink-light);
  transition: var(--transition-fast);
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  border-color: var(--cinnabar-red);
  color: var(--cinnabar-red);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
  padding: 0 26px;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding-bottom: 24px;
  transition: max-height 0.4s ease-in-out;
}

.faq-answer p {
  font-size: 0.95rem;
  color: var(--ink-soft);
  line-height: 1.8;
  border-top: 1px dashed var(--ink-border-light);
  padding-top: 16px;
}

/* ==========================================================================
   知识库与教程板块 (8篇核心文章)
   ========================================================================== */
.kb-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.kb-card {
  background: #ffffff;
  border: 1px solid var(--ink-border-light);
  border-radius: var(--radius-md);
  padding: 26px 22px;
  display: flex;
  flex-direction: column;
  transition: var(--transition-normal);
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow-subtle);
  position: relative;
}

.kb-card:hover {
  transform: translateY(-6px);
  border-color: var(--cinnabar-border);
  box-shadow: var(--shadow-card);
}

.kb-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.kb-card-category {
  font-size: 0.78rem;
  color: var(--ink-light);
  background: var(--bg-paper);
  padding: 3px 8px;
  border-radius: 4px;
}

.kb-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ink-deep);
  line-height: 1.5;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.kb-card:hover .kb-card-title {
  color: var(--cinnabar-red);
}

.kb-card-desc {
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

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

.read-link {
  color: var(--cinnabar-red);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ==========================================================================
   底栏 Footer
   ========================================================================== */
.site-footer {
  background: var(--ink-deep);
  color: #cbd5e1;
  padding: 70px 0 30px;
  position: relative;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 50px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .logo-mark {
  font-family: var(--font-calligraphy);
  font-size: 2.2rem;
  color: #ffffff;
  letter-spacing: 2px;
  margin-bottom: 14px;
}

.footer-brand p {
  font-size: 0.9rem;
  color: #94a3b8;
  line-height: 1.8;
  max-width: 320px;
  margin-bottom: 20px;
}

.footer-col h4 {
  font-size: 1.05rem;
  color: #ffffff;
  margin-bottom: 20px;
  font-weight: 600;
  position: relative;
  padding-left: 12px;
}

.footer-col h4::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 3px;
  background: var(--cinnabar-red);
  border-radius: 2px;
}

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

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

.footer-links a {
  color: #94a3b8;
  text-decoration: none;
  font-size: 0.9rem;
  transition: var(--transition-fast);
}

.footer-links a:hover {
  color: #ffffff;
  padding-left: 4px;
}

.footer-bottom {
  padding-top: 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: #64748b;
  flex-wrap: wrap;
  gap: 16px;
}

/* ==========================================================================
   教程文章独立页面专用样式 (Article Layout)
   ========================================================================== */
.article-header {
  padding: 50px 0 30px;
  border-bottom: 1px solid var(--ink-border-light);
  background: rgba(255, 255, 255, 0.6);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--ink-light);
  margin-bottom: 20px;
}

.breadcrumb a {
  color: var(--ink-medium);
  text-decoration: none;
}

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

.article-main-title {
  font-family: var(--font-serif);
  font-size: 2.6rem;
  line-height: 1.35;
  color: var(--ink-deep);
  margin-bottom: 20px;
}

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

.article-container {
  max-width: 900px;
  margin: 50px auto;
  padding: 0 24px;
}

.article-content {
  background: #ffffff;
  padding: 50px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--ink-border-light);
  box-shadow: var(--shadow-card);
  font-size: 1.05rem;
  line-height: 1.9;
  color: #2c343e;
}

.article-content h2 {
  font-family: var(--font-serif);
  font-size: 1.7rem;
  color: var(--ink-deep);
  margin: 44px 0 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--ink-border-light);
  display: flex;
  align-items: center;
  gap: 12px;
}

.article-content h2::before {
  content: '';
  width: 6px;
  height: 24px;
  background: var(--cinnabar-red);
  border-radius: 2px;
}

.article-content h3 {
  font-size: 1.3rem;
  color: var(--ink-primary);
  margin: 30px 0 16px;
}

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

.article-content ul, .article-content ol {
  margin: 0 0 24px 28px;
}

.article-content li {
  margin-bottom: 10px;
}

.article-content pre {
  background: #181b20;
  color: #f1f5f9;
  padding: 20px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.9rem;
  margin-bottom: 24px;
}

.article-content code {
  background: var(--bg-paper);
  border: 1px solid var(--ink-border-light);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--cinnabar-red);
}

.article-content pre code {
  background: transparent;
  border: none;
  color: inherit;
  padding: 0;
}

.article-content blockquote {
  border-left: 4px solid var(--cinnabar-red);
  padding: 16px 24px;
  background: var(--cinnabar-light);
  margin: 28px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--ink-medium);
  font-style: normal;
}

.article-cta-box {
  background: linear-gradient(135deg, #181b22 0%, #282f3c 100%);
  color: #ffffff;
  padding: 40px;
  border-radius: var(--radius-md);
  margin-top: 50px;
  text-align: center;
}

.article-cta-box h3 {
  font-family: var(--font-calligraphy);
  font-size: 2rem;
  margin-bottom: 12px;
  color: #ffffff;
}

.article-cta-box p {
  color: #94a3b8;
  max-width: 600px;
  margin: 0 auto 24px;
}

/* ==========================================================================
   响应式断点适配
   ========================================================================== */
@media (max-width: 1080px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-text {
    text-align: center;
  }
  .hero-badge-wrap, .hero-features-list, .hero-cta-group {
    justify-content: center;
  }
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .kb-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .mobile-toggle {
    display: block;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 74px;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.98);
    flex-direction: column;
    padding: 24px;
    border-bottom: 1px solid var(--ink-border);
    box-shadow: var(--shadow-card);
    gap: 18px;
  }
  .nav-links.active {
    display: flex;
  }
  .hero-title {
    font-size: 2.8rem;
  }
  .section-title {
    font-size: 2.2rem;
  }
  .advantages-grid, .pricing-grid, .testimonials-grid, .kb-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
  .article-content {
    padding: 28px 20px;
  }
  .article-main-title {
    font-size: 2rem;
  }
}