/* ==========================================================================
   瞬云 SHUNYUN - 日式极简与悬浮留白设计系统
   Domain: shunyunjc.homes
   Style Concept: Japanese Minimalist, Breathing Whitespace, Subtle Cloud Glow,
   Strict Grid Layout, Hairline Borders, Gentle Shadows.
   ========================================================================== */

:root {
  /* 暖白微颗粒底色体系 */
  --bg-primary: #FAF9F5;
  --bg-secondary: #F4F2EC;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --bg-muted: #EFECE6;

  /* 极浅天蓝浮云气晕 */
  --cloud-glow-1: rgba(186, 230, 253, 0.45);
  --cloud-glow-2: rgba(224, 242, 254, 0.65);
  --cloud-glow-3: rgba(199, 210, 254, 0.25);
  --accent-blue: #0284C7;
  --accent-blue-soft: #E0F2FE;

  /* 细线条与网格线体系 */
  --border-light: #EAE6DF;
  --border-medium: #DCD7CE;
  --border-dark: #C8C2B7;

  /* 墨黑与沉着灰阶文字体系 */
  --text-main: #1C1E21;
  --text-secondary: #585F69;
  --text-muted: #8E95A0;
  --text-light: #B4B9C2;

  /* 状态色彩 */
  --status-success: #10B981;
  --status-success-bg: #ECFDF5;
  --status-warning: #F59E0B;

  /* 字体系统 */
  --font-sans: "PingFang SC", -apple-system, BlinkMacSystemFont, "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Cascadia Code", Consolas, monospace;

  /* 阴影与微弧度 */
  --shadow-subtle: 0 4px 20px -2px rgba(28, 30, 33, 0.03), 0 2px 6px -1px rgba(28, 30, 33, 0.02);
  --shadow-hover: 0 12px 32px -4px rgba(28, 30, 33, 0.06), 0 4px 12px -2px rgba(28, 30, 33, 0.03);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* 容器宽度 */
  --max-width: 1200px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.75;
  letter-spacing: 0.02em;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* 暖白微颗粒质感底色叠加 (CSS Micro-grain Noise) */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 999;
  opacity: 0.032;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* 画面中一抹极淡的浅天蓝浮云气晕 (Floating Cloud Aura) */
.cloud-aura-ambient {
  position: fixed;
  top: -10%;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--cloud-glow-2) 0%, var(--cloud-glow-1) 45%, transparent 70%);
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.75;
  animation: cloudFloat 18s ease-in-out infinite alternate;
}

.cloud-aura-bottom {
  position: fixed;
  bottom: -20%;
  right: -10%;
  width: 700px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--cloud-glow-1) 0%, transparent 65%);
  filter: blur(90px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.5;
  animation: cloudFloatReverse 22s ease-in-out infinite alternate;
}

@keyframes cloudFloat {
  0% { transform: translateX(-50%) translateY(0) scale(1); }
  50% { transform: translateX(-47%) translateY(30px) scale(1.05); }
  100% { transform: translateX(-53%) translateY(-20px) scale(0.98); }
}

@keyframes cloudFloatReverse {
  0% { transform: translateY(0) scale(1); }
  100% { transform: translateY(-40px) scale(1.1); }
}

/* 链接与排版通用 */
a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

img, svg {
  vertical-align: middle;
  display: inline-block;
}

/* 栅格布局辅助容器 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* 顶部导航栏 (日式轻量悬浮) */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 249, 245, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  transition: all 0.3s ease;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.22rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--text-main);
}

.brand-symbol {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: #FFFFFF;
  border: 1px solid var(--border-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 6px rgba(0,0,0,0.03);
}

.brand-symbol svg {
  width: 18px;
  height: 18px;
  stroke: var(--text-main);
}

.brand-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  font-weight: 400;
  border-left: 1px solid var(--border-medium);
  padding-left: 10px;
  margin-left: 4px;
}

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

.nav-link {
  font-size: 0.88rem;
  color: var(--text-secondary);
  font-weight: 400;
  letter-spacing: 0.04em;
  padding: 6px 2px;
  position: relative;
}

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

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 1.5px;
  background: var(--text-main);
  transition: all 0.25s ease;
  transform: translateX(-50%);
}

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

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

/* 极简按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 18px;
  font-size: 0.88rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  border-radius: var(--radius-sm);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--text-main);
  color: #FFFFFF;
  border-color: var(--text-main);
}

.btn-primary:hover {
  background: #33383F;
  border-color: #33383F;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(28, 30, 33, 0.12);
}

.btn-outline {
  background: #FFFFFF;
  color: var(--text-main);
  border-color: var(--border-medium);
}

.btn-outline:hover {
  border-color: var(--text-main);
  background: #FAF9F6;
  transform: translateY(-1px);
}

.btn-sm {
  padding: 5px 12px;
  font-size: 0.8rem;
}

.btn-lg {
  padding: 12px 28px;
  font-size: 0.95rem;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--text-main);
}

/* 模块通用样式与呼吸感留白 */
.section {
  padding: 96px 0;
  position: relative;
  z-index: 1;
}

.section-alt {
  background: rgba(244, 242, 236, 0.45);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 64px auto;
}

.section-tag {
  display: inline-block;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-blue);
  background: var(--accent-blue-soft);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
  font-weight: 500;
  border: 1px solid rgba(2, 132, 199, 0.15);
}

.section-title {
  font-size: 2.1rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--text-main);
  margin-bottom: 16px;
  line-height: 1.35;
}

.section-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
  font-weight: 300;
}

/* HERO SECTION */
.hero-section {
  padding: 110px 0 80px 0;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--border-light);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
  box-shadow: var(--shadow-subtle);
}

.pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--status-success);
  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 8px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 350;
  letter-spacing: 0.1em;
  line-height: 1.25;
  color: var(--text-main);
  margin-bottom: 24px;
}

.hero-title-accent {
  font-weight: 500;
  background: linear-gradient(135deg, #1C1E21 20%, #0369A1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  max-width: 720px;
  margin: 0 auto 36px auto;
  font-size: 1.05rem;
  color: var(--text-secondary);
  font-weight: 300;
  line-height: 1.85;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 54px;
}

.hero-meta-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  padding: 16px 28px;
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  max-width: 820px;
  margin: 0 auto;
  box-shadow: var(--shadow-subtle);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.meta-item svg {
  width: 16px;
  height: 16px;
  stroke: var(--accent-blue);
}

/* ==========================================================================
   栅格网格系统 (Grid System - 等分网格、细边框对齐)
   ========================================================================== */

/* 核心优势板块 3 列等分网格 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  padding: 36px 30px;
  border-radius: var(--radius-md);
  transition: all 0.3s ease;
  position: relative;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-subtle);
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-medium);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.feature-icon-box {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-sm);
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: var(--text-main);
  box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

.feature-icon-box svg {
  width: 22px;
  height: 22px;
  stroke: var(--text-main);
}

.feature-card-num {
  position: absolute;
  top: 24px;
  right: 24px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-light);
  letter-spacing: 0.1em;
}

.feature-title {
  font-size: 1.15rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--text-main);
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
  font-weight: 300;
}

/* ==========================================================================
   节点延迟和状态板块 (Node Latency & Status)
   ========================================================================== */
.node-dashboard {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-subtle);
  overflow: hidden;
}

.node-board-header {
  padding: 20px 28px;
  background: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.node-board-status {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.node-stat-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.node-stat-val {
  color: var(--text-main);
  font-weight: 500;
}

.nodes-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border-light);
}

.node-item {
  background: #FFFFFF;
  padding: 24px 20px;
  transition: all 0.2s ease;
  position: relative;
}

.node-item:hover {
  background: #FDFCF9;
}

.node-item-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.node-name {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.node-flag {
  font-size: 1.1rem;
}

.node-type-tag {
  font-size: 0.7rem;
  padding: 2px 6px;
  border-radius: 3px;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.node-item-mid {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 8px;
}

.node-ping-val {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--status-success);
}

.node-ping-unit {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 400;
  margin-left: 2px;
}

.node-load-info {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.node-progress-track {
  width: 100%;
  height: 4px;
  background: var(--bg-muted);
  border-radius: 2px;
  overflow: hidden;
}

.node-progress-bar {
  height: 100%;
  background: var(--status-success);
  border-radius: 2px;
  transition: width 0.6s ease;
}

/* ==========================================================================
   套餐价格板块 (Pricing Packages - 4列等分网格)
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 36px 26px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-subtle);
}

.pricing-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-medium);
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.pricing-card.featured {
  background: #FFFFFF;
  border-color: var(--text-main);
  box-shadow: 0 8px 30px rgba(28, 30, 33, 0.08);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text-main);
  color: #FFFFFF;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  padding: 3px 12px;
  border-radius: var(--radius-full);
}

.pricing-tier-name {
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--text-main);
  margin-bottom: 8px;
}

.pricing-tier-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  min-height: 38px;
  line-height: 1.5;
  margin-bottom: 20px;
}

.pricing-price-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 6px;
}

.price-currency {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-main);
}

.price-num {
  font-size: 2.3rem;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--text-main);
  line-height: 1;
}

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

.price-sub-calc {
  font-size: 0.75rem;
  color: var(--accent-blue);
  margin-bottom: 24px;
  font-family: var(--font-mono);
}

.pricing-divider {
  height: 1px;
  background: var(--border-light);
  margin-bottom: 24px;
}

.pricing-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.84rem;
  color: var(--text-secondary);
}

.pricing-feature-item svg {
  width: 15px;
  height: 15px;
  stroke: var(--status-success);
  flex-shrink: 0;
}

.pricing-cta {
  width: 100%;
}

/* ==========================================================================
   知识库与教程板块 (Knowledge Base - 8篇长文网格)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 26px 22px;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-subtle);
  position: relative;
}

.article-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-medium);
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

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

.article-cat {
  font-size: 0.72rem;
  color: var(--accent-blue);
  background: var(--accent-blue-soft);
  padding: 2px 8px;
  border-radius: 3px;
  font-weight: 500;
}

.article-readtime {
  font-size: 0.72rem;
  color: var(--text-light);
  font-family: var(--font-mono);
}

.article-title {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-main);
  line-height: 1.5;
  margin-bottom: 12px;
  letter-spacing: 0.02em;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-excerpt {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 18px;
  font-weight: 300;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex-grow: 1;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.article-tag-item {
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--bg-secondary);
  padding: 2px 6px;
  border-radius: 2px;
}

.article-footer-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--text-main);
  font-weight: 500;
  border-top: 1px solid var(--border-light);
  padding-top: 14px;
}

.article-footer-link svg {
  width: 14px;
  height: 14px;
  transition: transform 0.2s ease;
}

.article-card:hover .article-footer-link svg {
  transform: translateX(3px);
}

/* ==========================================================================
   用户评价板块 (Testimonials - 3列等分网格)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 32px 26px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-subtle);
  transition: all 0.3s ease;
}

.review-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-medium);
  transform: translateY(-2px);
}

.review-stars {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
  color: #F59E0B;
}

.review-stars svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
}

.review-quote {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.75;
  font-weight: 300;
  margin-bottom: 24px;
  flex-grow: 1;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-light);
  padding-top: 16px;
}

.review-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
  font-size: 0.85rem;
  color: var(--text-main);
}

.review-name {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-main);
}

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

/* ==========================================================================
   常见问题板块 (FAQ - 手风琴交互)
   ========================================================================== */
.faq-wrap {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: all 0.25s ease;
}

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

.faq-question {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-main);
  background: transparent;
  border: none;
  width: 100%;
  text-align: left;
}

.faq-icon {
  width: 18px;
  height: 18px;
  stroke: var(--text-secondary);
  transition: transform 0.25s ease;
  flex-shrink: 0;
  margin-left: 16px;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  background: rgba(255, 255, 255, 0.5);
}

.faq-answer-inner {
  padding: 0 24px 22px 24px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.8;
  font-weight: 300;
  border-top: 1px solid rgba(234, 230, 223, 0.4);
}

/* ==========================================================================
   文章详情页排版规范 (Article Dedicated Styles)
   ========================================================================== */
.article-header-hero {
  padding: 60px 0 40px 0;
  border-bottom: 1px solid var(--border-light);
  background: rgba(255, 255, 255, 0.4);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

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

.article-main-title {
  font-size: 2.2rem;
  font-weight: 500;
  line-height: 1.35;
  color: var(--text-main);
  margin-bottom: 20px;
  letter-spacing: 0.04em;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.82rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  padding: 54px 0 96px 0;
}

.toc-sidebar {
  position: sticky;
  top: 96px;
  align-self: start;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 20px;
  box-shadow: var(--shadow-subtle);
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}

.toc-title {
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--text-main);
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-light);
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toc-link {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.4;
  display: block;
  padding: 4px 8px;
  border-radius: 3px;
  transition: all 0.2s ease;
}

.toc-link:hover, .toc-link.active {
  color: var(--text-main);
  background: var(--bg-secondary);
  font-weight: 500;
}

.article-content {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.9;
  font-weight: 300;
}

.article-content h2 {
  font-size: 1.55rem;
  font-weight: 500;
  color: var(--text-main);
  margin: 48px 0 20px 0;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
  letter-spacing: 0.04em;
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--text-main);
  margin: 32px 0 16px 0;
  letter-spacing: 0.02em;
}

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

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

.article-content li {
  margin-bottom: 8px;
}

.article-content strong {
  color: var(--text-main);
  font-weight: 600;
}

.article-callout {
  background: rgba(224, 242, 254, 0.4);
  border-left: 3px solid var(--accent-blue);
  padding: 18px 22px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 28px 0;
  font-size: 0.92rem;
  color: var(--text-main);
}

.article-table-wrap {
  overflow-x: auto;
  margin: 32px 0;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  background: #FFFFFF;
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.88rem;
}

.article-table th {
  background: var(--bg-secondary);
  color: var(--text-main);
  font-weight: 500;
  padding: 12px 18px;
  border-bottom: 1px solid var(--border-medium);
}

.article-table td {
  padding: 12px 18px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-secondary);
}

.article-table tr:last-child td {
  border-bottom: none;
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(255,255,255,0.9) 0%, rgba(240,249,255,0.85) 100%);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 36px 32px;
  margin: 54px 0;
  text-align: center;
  box-shadow: var(--shadow-subtle);
}

.article-cta-title {
  font-size: 1.35rem;
  font-weight: 500;
  color: var(--text-main);
  margin-bottom: 12px;
}

.article-cta-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0 auto 24px auto;
}

.related-articles {
  margin-top: 64px;
  padding-top: 42px;
  border-top: 1px solid var(--border-light);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 20px;
}

/* ==========================================================================
   底栏 (Footer)
   ========================================================================== */
.footer {
  border-top: 1px solid var(--border-light);
  background: rgba(255, 255, 255, 0.7);
  padding: 64px 0 32px 0;
  position: relative;
  z-index: 1;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-top: 14px;
  max-width: 320px;
  font-weight: 300;
}

.footer-col-title {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--text-main);
  margin-bottom: 18px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link {
  font-size: 0.82rem;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.footer-link:hover {
  color: var(--text-main);
}

.footer-bottom {
  border-top: 1px solid var(--border-light);
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 16px;
}

/* ==========================================================================
   响应式媒体查询 (Responsive)
   ========================================================================== */
@media (max-width: 1080px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .nodes-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-layout {
    grid-template-columns: 1fr;
  }
  .toc-sidebar {
    display: none;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .nav-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px;
    left: 0;
    width: 100%;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-medium);
    padding: 20px 24px;
    box-shadow: var(--shadow-hover);
    gap: 16px;
  }
  .mobile-menu-btn {
    display: block;
  }
  .hero-title {
    font-size: 2.2rem;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .hero-meta-strip {
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
}