/* 山水云机场首页 - 水墨黑白灰极简古风非对称设计系统 */
@import url('https://fonts.googleapis.com/css2?family=Ma+Shan+Zheng&family=Noto+Serif+SC:wght@400;600;700;900&family=Zhi+Mang+Xing&family=Plus+Jakarta+Sans:wght@400;500;600;700&display=swap');

:root {
  --bg-dark: #06090b;
  --bg-ink-deep: #0b1014;
  --bg-card: rgba(8, 12, 16, 0.85);
  --bg-card-hover: rgba(16, 22, 28, 0.95);
  
  /* 水墨黑白灰调色板 (去除所有黄色) */
  --mono-white: #ffffff;
  --mono-light: #e6ebf0;
  --mono-silver: #c4cbd2;
  --mono-slate: #8e9ca8;
  --mono-dim: #5c6c78;
  --mono-dark: #12181d;
  
  --border-mono: rgba(255, 255, 255, 0.2);
  --border-mono-light: rgba(255, 255, 255, 0.35);
  --shadow-mono: 0 10px 30px rgba(255, 255, 255, 0.15);
  
  --crimson-seal: #b22222;
  --crimson-glow: rgba(178, 34, 34, 0.35);
  
  --text-main: #e8ecef;
  --text-muted: #a0b0be;
  --text-dim: #5c6c78;

  --font-serif: 'Noto Serif SC', 'Songti SC', 'SimSun', serif;
  --font-brush: 'Ma Shan Zheng', 'Zhi Mang Xing', cursive, serif;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  
  --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-ink: 0 20px 50px rgba(0, 0, 0, 0.92);
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-serif);
  line-height: 1.8;
  overflow-x: hidden;
  position: relative;
}

/* 原图高清水墨背景全屏固定层 */
.bg-image-layer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: url('images/ink_bg.png') no-repeat center center;
  background-size: cover;
  z-index: -2;
  filter: brightness(0.82) contrast(1.08) grayscale(0.2);
}

/* 纯水墨黑白灰暗角与遮罩 */
.bg-overlay-layer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: 
    radial-gradient(circle at 75% 20%, rgba(255, 255, 255, 0.05) 0%, transparent 40%),
    radial-gradient(circle at 50% 50%, transparent 30%, rgba(4, 6, 8, 0.8) 100%),
    linear-gradient(180deg, rgba(6, 9, 11, 0.65) 0%, rgba(6, 9, 11, 0.35) 50%, rgba(6, 9, 11, 0.85) 100%);
  z-index: -1;
  pointer-events: none;
}

/* 动态水墨烟雾与飞鸟 Canvas 背景 */
#ink-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
  opacity: 0.75;
}

/* 顶部黑白灰告示横幅 */
.top-banner {
  background: rgba(11, 16, 20, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-mono);
  padding: 10px 24px;
  font-size: 0.9rem;
  color: var(--mono-light);
  position: relative;
  z-index: 100;
}

.top-banner-content {
  display: flex;
  align-items: center;
  gap: 14px;
  max-width: 1320px;
  margin: 0 auto;
  width: 100%;
}

.top-banner-tag {
  background: var(--crimson-seal);
  color: #fff;
  font-family: var(--font-brush);
  font-size: 0.95rem;
  padding: 2px 12px;
  border-radius: 2px;
  letter-spacing: 2px;
  box-shadow: 0 0 10px var(--crimson-glow);
  transform: rotate(-1deg);
}

.top-banner-text {
  font-family: var(--font-serif);
  letter-spacing: 1px;
  font-weight: 600;
}

/* Header 古风水墨导航栏 */
.header-nav {
  position: sticky;
  top: 0;
  z-index: 99;
  background: rgba(6, 9, 11, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-mono);
  padding: 18px 0;
  transition: var(--transition-smooth);
}

.nav-container {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 16px;
  text-decoration: none;
}

.logo-seal {
  width: 44px;
  height: 44px;
  background: var(--crimson-seal);
  color: #fff;
  font-family: var(--font-brush);
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  box-shadow: 0 0 18px var(--crimson-glow);
  transform: rotate(-3deg);
  transition: var(--transition-smooth);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.logo-area:hover .logo-seal {
  transform: rotate(0deg) scale(1.08);
}

.logo-text {
  font-family: var(--font-brush);
  font-size: 1.75rem;
  color: #ffffff;
  letter-spacing: 3px;
}

.logo-text span {
  color: var(--mono-silver);
  font-family: var(--font-serif);
  font-size: 1.3rem;
  margin-left: 6px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 32px;
  align-items: center;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.98rem;
  font-family: var(--font-serif);
  letter-spacing: 1.5px;
  transition: var(--transition-smooth);
  position: relative;
  padding: 6px 0;
}

.nav-links a:hover {
  color: var(--mono-white);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--mono-white), transparent);
  transition: var(--transition-smooth);
}

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

/* 导航黑白灰按钮 (替换黄色) */
.nav-cta-btn {
  background: linear-gradient(135deg, #e6ebf0 0%, #c4cbd2 100%) !important;
  color: #040608 !important;
  font-family: var(--font-brush) !important;
  font-size: 1.15rem !important;
  font-weight: 700 !important;
  padding: 8px 24px !important;
  border-radius: 4px;
  box-shadow: 0 4px 18px rgba(255, 255, 255, 0.2);
  letter-spacing: 2px !important;
  border: 1px solid #ffffff !important;
  transition: var(--transition-smooth) !important;
}

.nav-cta-btn:hover {
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 6px 25px rgba(255, 255, 255, 0.35) !important;
  background: #ffffff !important;
}

.nav-cta-btn::after { display: none !important; }

/* 主主体容器 */
.main-wrapper {
  position: relative;
  z-index: 2;
  max-width: 1320px;
  margin: 0 auto;
  padding: 40px 24px 80px 24px;
}

.section-asymmetric {
  margin-bottom: 120px;
  position: relative;
}

/* 黑白灰古风标题组 */
.section-title-box {
  margin-bottom: 52px;
  position: relative;
}

.section-subtitle-seal {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-brush);
  color: var(--mono-silver);
  font-size: 1.35rem;
  letter-spacing: 4px;
  margin-bottom: 8px;
}

.section-subtitle-seal::before {
  content: '❖';
  color: var(--crimson-seal);
  font-size: 0.9rem;
}

.section-title {
  font-family: var(--font-brush);
  font-size: 2.8rem;
  font-weight: 400;
  color: #ffffff;
  letter-spacing: 3px;
  text-shadow: 0 2px 10px rgba(0,0,0,0.9);
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--mono-silver), transparent);
  margin-top: 10px;
  border-radius: 2px;
}

/* 黑白灰透明水墨卡片 */
.gufeng-card {
  background: var(--bg-card);
  border: 1px solid var(--border-mono);
  border-radius: 8px;
  padding: 36px;
  position: relative;
  box-shadow: var(--shadow-ink);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: var(--transition-smooth);
}

.gufeng-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; width: 16px; height: 16px;
  border-top: 2px solid var(--mono-silver);
  border-left: 2px solid var(--mono-silver);
}

.gufeng-card::after {
  content: '';
  position: absolute;
  bottom: 0; right: 0; width: 16px; height: 16px;
  border-bottom: 2px solid var(--mono-silver);
  border-right: 2px solid var(--mono-silver);
}

.gufeng-card:hover {
  border-color: var(--border-mono-light);
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.95), 0 0 25px rgba(255, 255, 255, 0.1);
}

/* Hero 非对称 7:5 */
.hero-asymmetric {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: 50px;
  align-items: center;
  min-height: 540px;
  padding: 30px 0 70px 0;
}

.hero-left { padding-right: 20px; }

.hero-badge-gufeng {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: rgba(178, 34, 34, 0.15);
  border: 1px solid rgba(178, 34, 34, 0.4);
  padding: 6px 20px;
  border-radius: 4px;
  color: var(--mono-light);
  font-family: var(--font-serif);
  font-size: 0.9rem;
  letter-spacing: 2px;
  margin-bottom: 28px;
}

.hero-badge-seal {
  width: 8px;
  height: 8px;
  background: var(--crimson-seal);
  transform: rotate(45deg);
}

.hero-heading {
  font-family: var(--font-brush);
  font-size: 3.8rem;
  line-height: 1.25;
  margin-bottom: 24px;
  color: #ffffff;
  letter-spacing: 4px;
}

.hero-heading span {
  background: linear-gradient(135deg, #ffffff 0%, var(--mono-silver) 60%, #a4b0be 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 40px;
  max-width: 92%;
  line-height: 1.95;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
}

/* 主按钮黑白灰替换 (开启极速通道) */
.btn-gufeng-primary {
  background: linear-gradient(135deg, #e6ebf0 0%, #c4cbd2 100%);
  color: #040608;
  font-family: var(--font-brush);
  font-size: 1.3rem;
  letter-spacing: 2px;
  padding: 16px 40px;
  border: 1px solid #ffffff;
  border-radius: 4px;
  cursor: pointer;
  box-shadow: 0 10px 30px rgba(255, 255, 255, 0.2);
  transition: var(--transition-smooth);
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.btn-gufeng-primary:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: 0 15px 45px rgba(255, 255, 255, 0.35);
  background: #ffffff;
}

.btn-gufeng-secondary {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-mono);
  color: var(--text-main);
  font-family: var(--font-serif);
  font-size: 1.05rem;
  letter-spacing: 1.5px;
  padding: 16px 32px;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition-smooth);
  text-decoration: none;
}

.btn-gufeng-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--mono-silver);
  color: #ffffff;
}

/* Hero 右侧卷轴卡片 */
.ink-scroll-card {
  background: var(--bg-card);
  border: 1px solid var(--border-mono);
  border-radius: 8px;
  padding: 40px;
  position: relative;
  box-shadow: var(--shadow-ink);
  backdrop-filter: blur(14px);
  transform: translateY(-15px) rotate(1.5deg);
  transition: var(--transition-smooth);
}

.ink-scroll-card:hover {
  transform: translateY(-22px) rotate(0deg);
  border-color: var(--mono-silver);
}

.ink-scroll-seal {
  position: absolute;
  top: -18px;
  right: 24px;
  background: var(--crimson-seal);
  color: #ffffff;
  font-family: var(--font-brush);
  padding: 4px 16px;
  font-size: 1.05rem;
  border-radius: 2px;
  letter-spacing: 3px;
  box-shadow: 0 4px 15px var(--crimson-glow);
}

.stat-grid-gufeng {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 28px;
}

.stat-item-gufeng {
  background: rgba(4, 6, 8, 0.65);
  padding: 18px;
  border-radius: 6px;
  border-left: 3px solid var(--mono-silver);
}

.stat-num-gufeng {
  font-family: var(--font-brush);
  font-size: 2.2rem;
  color: var(--mono-white);
}

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

/* 板块3：节点测速 非对称 4:8 */
.nodes-asymmetric {
  display: grid;
  grid-template-columns: 4fr 8fr;
  gap: 44px;
  align-items: start;
}

.node-monitor-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.node-card-gufeng {
  background: var(--bg-card);
  border: 1px solid var(--border-mono);
  border-radius: 8px;
  padding: 24px;
  backdrop-filter: blur(12px);
  transition: var(--transition-smooth);
}

.node-card-gufeng:hover {
  border-color: var(--mono-silver);
  transform: translateY(-5px);
}

.node-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.node-region-gufeng {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.15rem;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 10px;
}

.node-status-gufeng {
  font-size: 0.78rem;
  padding: 3px 10px;
  border-radius: 12px;
  background: rgba(46, 204, 113, 0.12);
  color: #2ecc71;
  border: 1px solid rgba(46, 204, 113, 0.3);
}

.node-ping-box {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px dashed var(--border-mono);
}

.ping-val-gufeng {
  font-family: var(--font-brush);
  font-size: 1.6rem;
  color: var(--mono-light);
}

.ping-val-gufeng.fast { color: #2ecc71; }
.ping-val-gufeng.medium { color: var(--mono-silver); }

.ping-btn-gufeng {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-mono);
  color: var(--mono-light);
  font-family: var(--font-serif);
  font-size: 0.82rem;
  padding: 5px 12px;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.ping-btn-gufeng:hover {
  background: var(--mono-white);
  color: #040506;
}

/* 板块4：套餐 & 优势 黑白灰 */
.pricing-grid-asymmetric {
  display: grid;
  grid-template-columns: 1fr 1.18fr 1fr;
  gap: 30px;
  align-items: center;
}

.pricing-card-gufeng {
  background: var(--bg-card);
  border: 1px solid var(--border-mono);
  border-radius: 8px;
  padding: 40px 30px;
  position: relative;
  backdrop-filter: blur(14px);
  transition: var(--transition-smooth);
}

.pricing-card-gufeng.featured {
  background: linear-gradient(180deg, rgba(16, 22, 28, 0.95) 0%, rgba(8, 12, 16, 0.98) 100%);
  border: 2px solid var(--mono-silver);
  transform: translateY(-16px);
  box-shadow: 0 25px 50px rgba(0,0,0,0.85), 0 0 25px rgba(255, 255, 255, 0.15);
}

.featured-ribbon-gufeng {
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, var(--crimson-seal), #8b0000);
  color: #ffffff;
  font-family: var(--font-brush);
  font-size: 1rem;
  padding: 4px 22px;
  border-radius: 4px;
  letter-spacing: 2px;
}

.pricing-plan-name-gufeng {
  font-family: var(--font-brush);
  font-size: 1.8rem;
  margin-bottom: 12px;
  color: #fff;
}

.pricing-price-gufeng {
  font-family: var(--font-brush);
  font-size: 3.2rem;
  color: var(--mono-white);
  margin-bottom: 24px;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.pricing-price-gufeng span {
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--text-muted);
}

.pricing-features-gufeng {
  list-style: none;
  margin-bottom: 36px;
}

.pricing-features-gufeng li {
  padding: 12px 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
  font-size: 0.96rem;
  display: flex;
  align-items: center;
  gap: 12px;
}

.pricing-features-gufeng li i { color: var(--mono-silver); }

.btn-pricing-gufeng {
  width: 100%;
  padding: 14px;
  border-radius: 4px;
  border: 1px solid var(--mono-silver);
  background: transparent;
  color: var(--mono-white);
  font-family: var(--font-brush);
  font-size: 1.25rem;
  letter-spacing: 2px;
  cursor: pointer;
  transition: var(--transition-smooth);
  text-align: center;
  display: block;
  text-decoration: none;
}

.pricing-card-gufeng.featured .btn-pricing-gufeng {
  background: linear-gradient(135deg, #e6ebf0 0%, #c4cbd2 100%);
  color: #040506;
  border: 1px solid #ffffff;
}

.btn-pricing-gufeng:hover {
  background: #ffffff;
  color: #040506;
}

/* 核心优势 非对称 5:7 */
.advantages-asymmetric {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 48px;
  align-items: center;
}

.advantages-grid-gufeng {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.adv-card-gufeng {
  background: var(--bg-card);
  border: 1px solid var(--border-mono);
  padding: 28px;
  border-radius: 8px;
  backdrop-filter: blur(12px);
  transition: var(--transition-smooth);
}

.adv-card-gufeng:nth-child(2) { transform: translateY(18px); }
.adv-card-gufeng:nth-child(4) { transform: translateY(18px); }

.adv-card-gufeng:hover {
  border-color: var(--mono-silver);
  transform: translateY(-5px);
}

.adv-icon-gufeng {
  width: 48px;
  height: 48px;
  background: rgba(178, 34, 34, 0.15);
  border: 1px solid rgba(178, 34, 34, 0.35);
  color: var(--mono-silver);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 18px;
}

.adv-title-gufeng {
  font-family: var(--font-brush);
  font-size: 1.4rem;
  color: #fff;
  margin-bottom: 8px;
}

.adv-desc-gufeng {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* 板块5：FAQ与知识库 非对称 4.5:7.5 */
.faq-knowledge-asymmetric {
  display: grid;
  grid-template-columns: 4.5fr 7.5fr;
  gap: 50px;
}

.faq-accordion-gufeng {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.faq-item-gufeng {
  background: var(--bg-card);
  border: 1px solid var(--border-mono);
  border-radius: 6px;
  overflow: hidden;
  backdrop-filter: blur(12px);
  transition: var(--transition-smooth);
}

.faq-question-gufeng {
  padding: 20px 24px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.02rem;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-question-gufeng:hover { color: #ffffff; }

.faq-icon-gufeng {
  color: var(--mono-silver);
  font-family: var(--font-brush);
  font-size: 1.2rem;
  transition: transform 0.35s ease;
}

.faq-item-gufeng.active .faq-icon-gufeng { transform: rotate(45deg); }

.faq-answer-gufeng {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
  background: rgba(4, 6, 8, 0.4);
  color: var(--text-muted);
  font-size: 0.95rem;
  padding: 0 24px;
  line-height: 1.8;
}

.faq-item-gufeng.active .faq-answer-gufeng {
  max-height: 240px;
  padding: 18px 24px;
}

/* 知识库卡片 */
.kb-cards-grid-gufeng {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.kb-card-gufeng {
  background: var(--bg-card);
  border: 1px solid var(--border-mono);
  border-radius: 8px;
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(12px);
  transition: var(--transition-smooth);
  text-decoration: none;
}

.kb-card-gufeng:hover {
  border-color: var(--mono-silver);
  transform: translateY(-6px);
}

.kb-tag-gufeng {
  font-family: var(--font-brush);
  font-size: 0.9rem;
  color: var(--mono-white);
  background: rgba(255, 255, 255, 0.1);
  padding: 3px 12px;
  border-radius: 4px;
  align-self: flex-start;
  margin-bottom: 14px;
  border: 1px solid var(--border-mono);
}

.kb-title-gufeng {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
  line-height: 1.45;
}

.kb-excerpt-gufeng {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 18px;
}

.kb-link-gufeng {
  font-family: var(--font-brush);
  font-size: 1.05rem;
  color: var(--mono-silver);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* 板块6：用户评价 */
.testimonials-asymmetric {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.testi-card-gufeng {
  background: var(--bg-card);
  border: 1px solid var(--border-mono);
  border-radius: 8px;
  padding: 32px;
  backdrop-filter: blur(12px);
  transition: var(--transition-smooth);
}

.testi-card-gufeng:nth-child(2) {
  transform: translateY(-18px);
  border-color: var(--border-mono-light);
}

.testi-quote-gufeng {
  font-size: 0.98rem;
  color: var(--text-main);
  margin-bottom: 24px;
  font-style: italic;
  line-height: 1.8;
}

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

.testi-avatar-gufeng {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--crimson-seal);
  color: #fff;
  font-family: var(--font-brush);
  font-size: 1.3rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.testi-info h5 {
  font-family: var(--font-serif);
  font-size: 1rem;
  color: #fff;
  font-weight: 700;
}

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

/* 页脚 */
.footer-section {
  background: rgba(4, 6, 8, 0.96);
  border-top: 1px solid var(--border-mono);
  padding: 70px 0 45px 0;
  position: relative;
  z-index: 2;
}

.footer-container {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 44px;
  margin-bottom: 40px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin-top: 18px;
  max-width: 340px;
}

.footer-col h4 {
  font-family: var(--font-brush);
  font-size: 1.3rem;
  color: var(--mono-white);
  margin-bottom: 22px;
}

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

.footer-col ul a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: var(--transition-smooth);
}

.footer-col ul a:hover { color: var(--mono-white); }

.footer-bottom {
  max-width: 1320px;
  margin: 0 auto;
  padding: 28px 24px 0 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-dim);
  font-size: 0.88rem;
}

/* 文章详情页与全局兼容 */
.article-page-body {
  background-color: var(--bg-dark);
}

.article-content h2 {
  border-left-color: var(--mono-silver) !important;
  color: var(--mono-white) !important;
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.08) 0%, rgba(178, 34, 34, 0.12) 100%) !important;
  border-color: var(--border-mono-light) !important;
}

.article-cta-box h3 {
  color: var(--mono-white) !important;
}

@media (max-width: 1024px) {
  .hero-asymmetric, .nodes-asymmetric, .advantages-asymmetric, .faq-knowledge-asymmetric {
    grid-template-columns: 1fr;
    gap: 38px;
  }
  .pricing-grid-asymmetric { grid-template-columns: 1fr; }
  .pricing-card-gufeng.featured { transform: none; }
  .testimonials-asymmetric { grid-template-columns: 1fr; }
  .testi-card-gufeng:nth-child(2) { transform: none; }
  .footer-container { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .hero-heading { font-size: 2.6rem; }
  .node-monitor-grid, .kb-cards-grid-gufeng, .advantages-grid-gufeng {
    grid-template-columns: 1fr;
  }
  .footer-container { grid-template-columns: 1fr; }
}