/* ==========================================================================
   泰山机场网络加速服务 - 浅砂建筑质感设计系统 (Light Architectural Interface)
   配色系统：浅砂背景 (#F7F5EE, #FAF9F5, #EFECE3)
             森林绿字体 (#163323, #284435, #536E5E)
             珊瑚粉/珊瑚红重点色 (#E76247, #FDF1EE)
             狭窄/窄体展示字型 + 模块化垂直标带 + 软3D叠层瓷砖 (Stacked Tiles)
   ========================================================================== */

:root {
  /* 基础浅砂色调 */
  --bg-sand-light: #F7F5EE;
  --bg-sand-warm: #EFECE3;
  --bg-sand-card: #FAF9F5;
  --bg-sand-border: #E4DFD2;
  --bg-sand-darker: #E5DFC8;
  --bg-white: #FFFFFF;

  /* 森林绿调 */
  --text-forest-dark: #163323;
  --text-forest-body: #284435;
  --text-forest-muted: #536E5E;
  --text-forest-light: #7E9487;
  --border-forest: #163323;
  --border-forest-subtle: rgba(22, 51, 35, 0.14);

  /* 珊瑚红亮点 */
  --color-coral: #E76247;
  --color-coral-hover: #CF4E34;
  --color-coral-subtle: #FDF1EE;
  --color-coral-border: #F5C6BD;

  /* 辅助状态色 */
  --color-emerald: #1B7F52;
  --color-gold: #C28B38;
  --color-sky: #2B6CB0;

  /* 软 3D 叠层阴影 */
  --shadow-tile-sm: 3px 3px 0 #DFDDD2;
  --shadow-tile-md: 5px 5px 0 #D5D1C3, 10px 10px 20px rgba(22, 51, 35, 0.04);
  --shadow-tile-lg: 8px 8px 0 #CBC7B7, 16px 16px 30px rgba(22, 51, 35, 0.06);
  --shadow-coral-md: 5px 5px 0 #E76247;

  /* 圆角与间距 */
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --container-max: 1200px;
  --transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg-sand-light);
  color: var(--text-forest-body);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-image: 
    linear-gradient(to right, rgba(22, 51, 35, 0.025) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(22, 51, 35, 0.025) 1px, transparent 1px);
  background-size: 40px 40px;
}

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

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

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

/* 建筑狭窄展示字型 */
.font-display {
  font-family: -apple-system, BlinkMacSystemFont, "Impact", "Segoe UI", "PingFang SC", sans-serif;
  font-stretch: condensed;
  letter-spacing: -0.015em;
  font-weight: 800;
  color: var(--text-forest-dark);
}

/* 容器与布局 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 模块化垂直标带与微线 */
.architectural-band {
  position: relative;
  border-left: 1px dashed var(--bg-sand-border);
  border-right: 1px dashed var(--bg-sand-border);
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-forest-dark);
  background-color: var(--bg-sand-warm);
  border: 1px solid var(--bg-sand-border);
  border-radius: var(--radius-xs);
  margin-bottom: 12px;
}

.section-label::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-coral);
}

.section-header {
  margin-bottom: 3rem;
  position: relative;
}

.section-title {
  font-size: clamp(1.8rem, 3.2vw, 2.5rem);
  line-height: 1.15;
  color: var(--text-forest-dark);
  margin-bottom: 0.75rem;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-forest-muted);
  max-width: 680px;
}

/* 软 3D 叠层瓷砖 (Stacked 3D Tiles) */
.tile-stacked {
  background: var(--bg-white);
  border: 1px solid var(--bg-sand-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-tile-md);
  transition: var(--transition);
  position: relative;
}

.tile-stacked::after {
  content: "";
  position: absolute;
  top: 4px;
  right: -5px;
  bottom: -5px;
  left: 4px;
  border: 1px solid var(--bg-sand-border);
  border-radius: var(--radius-md);
  z-index: -1;
  background-color: var(--bg-sand-warm);
  pointer-events: none;
  transition: var(--transition);
}

.tile-stacked:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-tile-lg);
}

.tile-stacked:hover::after {
  transform: translate(2px, 2px);
}

/* 珊瑚红叠层卡片 */
.tile-coral-accent {
  background: var(--bg-white);
  border: 2px solid var(--color-coral);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-coral-md);
  position: relative;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  border-radius: var(--radius-xs);
  transition: var(--transition);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-coral);
  color: #FFFFFF;
  border: 1px solid var(--color-coral-hover);
  box-shadow: 3px 3px 0 var(--text-forest-dark);
}

.btn-primary:hover {
  background-color: var(--color-coral-hover);
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0 var(--text-forest-dark);
}

.btn-secondary {
  background-color: var(--bg-white);
  color: var(--text-forest-dark);
  border: 1px solid var(--text-forest-dark);
  box-shadow: 3px 3px 0 var(--bg-sand-border);
}

.btn-secondary:hover {
  background-color: var(--bg-sand-warm);
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0 var(--text-forest-dark);
}

.btn-sm {
  padding: 7px 14px;
  font-size: 0.85rem;
}

/* ==========================================================================
   Header 导航栏
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(247, 245, 238, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--bg-sand-border);
}

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

.site-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-forest-body);
  transition: var(--transition);
  position: relative;
  padding: 4px 0;
}

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

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

/* 移动端汉堡按钮 */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  padding: 0;
  cursor: pointer;
  z-index: 110;
}

.mobile-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--text-forest-dark);
  border-radius: 2px;
  transition: var(--transition);
}

.mobile-toggle.active span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}

.mobile-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-toggle.active span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

.mobile-drawer {
  display: none;
  position: fixed;
  top: 68px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-sand-light);
  border-top: 1px solid var(--bg-sand-border);
  padding: 24px;
  z-index: 99;
  flex-direction: column;
  gap: 16px;
  overflow-y: auto;
}

.mobile-drawer.open {
  display: flex;
}

.mobile-nav-link {
  font-size: 1.15rem;
  font-weight: 700;
  padding: 10px 0;
  border-bottom: 1px dashed var(--bg-sand-border);
  color: var(--text-forest-dark);
}

/* ==========================================================================
   Hero 主视觉区 (Offset Hero 构图)
   ========================================================================== */
.hero-section {
  padding: 60px 0 70px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-content {
  position: relative;
}

.hero-badge-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.hero-badge {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  background: var(--bg-sand-warm);
  border: 1px solid var(--bg-sand-border);
  border-radius: var(--radius-xs);
  color: var(--text-forest-dark);
}

.hero-title {
  font-size: clamp(2.4rem, 4.4vw, 3.6rem);
  line-height: 1.08;
  color: var(--text-forest-dark);
  margin-bottom: 20px;
}

.hero-title span.coral-text {
  color: var(--color-coral);
  position: relative;
}

.hero-title span.coral-text::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 4px;
  width: 100%;
  height: 4px;
  background-color: var(--color-coral-border);
  z-index: -1;
}

.hero-subtitle {
  font-size: 1.12rem;
  line-height: 1.68;
  color: var(--text-forest-body);
  margin-bottom: 28px;
  max-width: 580px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.hero-specs-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  padding: 16px;
  background-color: var(--bg-sand-warm);
  border: 1px solid var(--bg-sand-border);
  border-radius: var(--radius-sm);
}

.spec-item {
  border-right: 1px dashed var(--bg-sand-border);
  padding-right: 12px;
}

.spec-item:last-child {
  border-right: none;
  padding-right: 0;
}

.spec-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-forest-muted);
  margin-bottom: 2px;
}

.spec-val {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-forest-dark);
}

/* 右侧 Offset 3D Stacked 节点终端 */
.hero-dashboard-wrap {
  position: relative;
}

.hero-dashboard {
  padding: 24px;
}

.dashboard-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--bg-sand-border);
  margin-bottom: 18px;
}

.dash-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-emerald);
  background: rgba(27, 127, 82, 0.1);
  padding: 3px 8px;
  border-radius: 12px;
}

.dash-pill-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-emerald);
}

.dash-node-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.dash-node-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background-color: var(--bg-sand-card);
  border: 1px solid var(--bg-sand-border);
  border-radius: var(--radius-xs);
  font-size: 0.88rem;
  transition: var(--transition);
}

.dash-node-row:hover {
  border-color: var(--color-coral);
  background-color: #FFFFFF;
}

.node-region {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  color: var(--text-forest-dark);
}

.node-region-flag {
  font-size: 1rem;
}

.node-latency {
  font-family: monospace;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-emerald);
}

.dash-stats-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-forest-muted);
  padding-top: 12px;
  border-top: 1px dashed var(--bg-sand-border);
}

/* ==========================================================================
   Horizontal Node Strip 全球节点水平通栏
   ========================================================================== */
.node-strip-section {
  padding: 24px 0;
  background-color: var(--bg-sand-warm);
  border-top: 1px solid var(--bg-sand-border);
  border-bottom: 1px solid var(--bg-sand-border);
  overflow: hidden;
}

.node-strip-track {
  display: flex;
  align-items: center;
  gap: 16px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
  scrollbar-color: var(--bg-sand-border) transparent;
}

.strip-item {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 18px;
  background-color: var(--bg-white);
  border: 1px solid var(--bg-sand-border);
  border-radius: var(--radius-xs);
  box-shadow: 2px 2px 0 var(--bg-sand-border);
  font-size: 0.85rem;
}

.strip-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-emerald);
}

.strip-name {
  font-weight: 700;
  color: var(--text-forest-dark);
}

.strip-meta {
  color: var(--text-forest-muted);
  font-size: 0.78rem;
  font-family: monospace;
}

/* ==========================================================================
   核心优势 (3+ 图文卡片)
   ========================================================================== */
.advantages-section {
  padding: 80px 0;
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.adv-card {
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
}

.adv-icon-wrap {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-coral-subtle);
  border: 1px solid var(--color-coral-border);
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  color: var(--color-coral);
}

.adv-title {
  font-size: 1.3rem;
  color: var(--text-forest-dark);
  margin-bottom: 12px;
}

.adv-desc {
  font-size: 0.95rem;
  color: var(--text-forest-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.adv-specs-list {
  list-style: none;
  border-top: 1px dashed var(--bg-sand-border);
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-forest-body);
}

.adv-specs-list li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.adv-specs-list li::before {
  content: "■";
  font-size: 0.5rem;
  color: var(--color-coral);
}

/* ==========================================================================
   AI 与流媒体区域 (Illustrated AI/Streaming Matrix)
   ========================================================================== */
.ai-streaming-section {
  padding: 80px 0;
  background-color: var(--bg-sand-warm);
  border-top: 1px solid var(--bg-sand-border);
  border-bottom: 1px solid var(--bg-sand-border);
}

.matrix-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.matrix-card {
  padding: 32px;
  background: var(--bg-white);
  border: 1px solid var(--bg-sand-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-tile-md);
}

.matrix-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.matrix-title {
  font-size: 1.4rem;
  color: var(--text-forest-dark);
}

.matrix-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-xs);
  background-color: var(--bg-sand-warm);
  color: var(--text-forest-dark);
  border: 1px solid var(--bg-sand-border);
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.platform-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  background-color: var(--bg-sand-card);
  border: 1px solid var(--bg-sand-border);
  border-radius: var(--radius-xs);
}

.plat-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-forest-dark);
}

.plat-status {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-emerald);
}

.matrix-notes {
  font-size: 0.85rem;
  color: var(--text-forest-muted);
  line-height: 1.6;
  border-top: 1px dashed var(--bg-sand-border);
  padding-top: 16px;
}

/* ==========================================================================
   套餐价格 (Clean Pricing Comparison)
   ========================================================================== */
.pricing-section {
  padding: 80px 0;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.pricing-card {
  padding: 28px 20px;
  display: flex;
  flex-direction: column;
}

.pricing-card.featured {
  border: 2px solid var(--color-coral);
  box-shadow: 6px 6px 0 var(--color-coral);
  position: relative;
  background-color: #FFFFFF;
}

.featured-tag {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-coral);
  color: #FFFFFF;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  padding: 3px 12px;
  border-radius: 12px;
  text-transform: uppercase;
}

.plan-name {
  font-size: 1.25rem;
  color: var(--text-forest-dark);
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.82rem;
  color: var(--text-forest-muted);
  min-height: 38px;
  margin-bottom: 16px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--bg-sand-border);
}

.price-currency {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-forest-dark);
}

.price-amount {
  font-size: 2.2rem;
  line-height: 1;
  color: var(--text-forest-dark);
}

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

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--text-forest-body);
  margin-bottom: 24px;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.plan-features svg {
  flex-shrink: 0;
  margin-top: 3px;
  color: var(--color-coral);
}

.pricing-disclaimer {
  margin-top: 28px;
  padding: 16px;
  background: var(--bg-sand-warm);
  border: 1px solid var(--bg-sand-border);
  border-radius: var(--radius-xs);
  font-size: 0.82rem;
  color: var(--text-forest-muted);
  text-align: center;
}

/* ==========================================================================
   使用教程 (Tutorials)
   ========================================================================== */
.tutorials-section {
  padding: 80px 0;
  background-color: var(--bg-sand-warm);
  border-top: 1px solid var(--bg-sand-border);
  border-bottom: 1px solid var(--bg-sand-border);
}

.tutorial-steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.step-card {
  padding: 24px;
  background: var(--bg-white);
  border: 1px solid var(--bg-sand-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-tile-sm);
}

.step-num {
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--color-coral);
  margin-bottom: 10px;
  line-height: 1;
}

.step-title {
  font-size: 1.1rem;
  color: var(--text-forest-dark);
  margin-bottom: 8px;
}

.step-desc {
  font-size: 0.88rem;
  color: var(--text-forest-muted);
  line-height: 1.6;
}

/* ==========================================================================
   Editorial Article Grid (9 篇 SEO 文章 3x3 Grid)
   ========================================================================== */
.articles-section {
  padding: 80px 0;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.article-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.article-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 8px;
  background-color: var(--color-coral-subtle);
  border: 1px solid var(--color-coral-border);
  color: var(--color-coral);
  border-radius: var(--radius-xs);
}

.article-readtime {
  font-size: 0.75rem;
  color: var(--text-forest-muted);
}

.article-title {
  font-size: 1.18rem;
  line-height: 1.35;
  color: var(--text-forest-dark);
  margin-bottom: 10px;
  transition: var(--transition);
}

.article-title:hover {
  color: var(--color-coral);
}

.article-excerpt {
  font-size: 0.88rem;
  color: var(--text-forest-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}

.article-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px dashed var(--bg-sand-border);
  padding-top: 12px;
  font-size: 0.8rem;
}

.article-date {
  color: var(--text-forest-muted);
}

.article-link {
  font-weight: 700;
  color: var(--color-coral);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.article-link:hover {
  text-decoration: underline;
}

/* ==========================================================================
   用户评价 (Testimonials - 占位场景标记)
   ========================================================================== */
.testimonials-section {
  padding: 80px 0;
  background-color: var(--bg-sand-warm);
  border-top: 1px solid var(--bg-sand-border);
  border-bottom: 1px solid var(--bg-sand-border);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testi-card {
  padding: 24px;
  background: var(--bg-white);
  border: 1px solid var(--bg-sand-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-tile-sm);
}

.testi-quote {
  font-size: 0.92rem;
  color: var(--text-forest-body);
  line-height: 1.65;
  margin-bottom: 18px;
  font-style: italic;
}

.testi-author {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px dashed var(--bg-sand-border);
  padding-top: 12px;
}

.testi-name {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-forest-dark);
}

.testi-role {
  font-size: 0.78rem;
  color: var(--text-forest-muted);
}

.testi-disclaimer {
  margin-top: 24px;
  font-size: 0.78rem;
  color: var(--text-forest-muted);
  text-align: center;
}

/* ==========================================================================
   FAQ 常见问题
   ========================================================================== */
.faq-section {
  padding: 80px 0;
}

.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-white);
  border: 1px solid var(--bg-sand-border);
  border-radius: var(--radius-xs);
  box-shadow: 2px 2px 0 var(--bg-sand-border);
  overflow: hidden;
  transition: var(--transition);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-forest-dark);
  text-align: left;
  cursor: pointer;
  background: none;
  border: none;
}

.faq-icon {
  width: 18px;
  height: 18px;
  transition: transform 0.25s ease;
  color: var(--color-coral);
  flex-shrink: 0;
}

.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);
  padding: 0 20px;
  font-size: 0.95rem;
  color: var(--text-forest-muted);
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding-bottom: 20px;
}

/* ==========================================================================
   Footer 页脚
   ========================================================================== */
.site-footer {
  background-color: var(--bg-sand-warm);
  border-top: 2px solid var(--text-forest-dark);
  padding: 60px 0 30px;
  position: relative;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand-col p {
  font-size: 0.88rem;
  color: var(--text-forest-muted);
  max-width: 320px;
  margin-top: 12px;
  line-height: 1.6;
}

.footer-col-title {
  font-size: 0.92rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--text-forest-dark);
  margin-bottom: 16px;
  text-transform: uppercase;
}

.footer-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-forest-body);
}

.footer-nav-list a:hover {
  color: var(--color-coral);
  text-decoration: underline;
}

/* PBN 相关站点外链 (按照指令严格 dofollow 且显色处理) */
.footer-pbn-bar {
  border-top: 1px dashed var(--bg-sand-border);
  padding-top: 20px;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 0.85rem;
}

.pbn-label {
  color: var(--text-forest-muted);
  font-weight: 600;
}

.pbn-link {
  color: var(--color-coral);
  font-weight: 700;
  padding: 3px 8px;
  background-color: #FFFFFF;
  border: 1px solid var(--color-coral-border);
  border-radius: var(--radius-xs);
  transition: var(--transition);
}

.pbn-link:hover {
  background-color: var(--color-coral);
  color: #FFFFFF;
}

.footer-bottom {
  border-top: 1px solid var(--bg-sand-border);
  padding-top: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-forest-muted);
  flex-wrap: wrap;
  gap: 12px;
}

/* ==========================================================================
   文章内页通用样式
   ========================================================================== */
.article-header {
  padding: 40px 0 24px;
  border-bottom: 1px solid var(--bg-sand-border);
  margin-bottom: 36px;
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-forest-muted);
  margin-bottom: 16px;
}

.breadcrumb-nav a {
  color: var(--text-forest-dark);
  font-weight: 600;
}

.breadcrumb-nav a:hover {
  color: var(--color-coral);
}

.article-content {
  max-width: 820px;
  margin: 0 auto;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-forest-body);
}

.article-content h1 {
  font-size: clamp(2rem, 3.5vw, 2.6rem);
  line-height: 1.2;
  color: var(--text-forest-dark);
  margin-bottom: 16px;
}

.article-content h2 {
  font-size: 1.6rem;
  color: var(--text-forest-dark);
  margin-top: 36px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--bg-sand-border);
}

.article-content h3 {
  font-size: 1.25rem;
  color: var(--text-forest-dark);
  margin-top: 24px;
  margin-bottom: 12px;
}

.article-content p {
  margin-bottom: 18px;
}

.article-content ul, .article-content ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

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

.article-table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 24px 0;
  border: 1px solid var(--bg-sand-border);
  border-radius: var(--radius-sm);
  background: #FFFFFF;
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.article-table th {
  background-color: var(--bg-sand-warm);
  color: var(--text-forest-dark);
  padding: 12px 16px;
  font-weight: 700;
  border-bottom: 1px solid var(--bg-sand-border);
}

.article-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--bg-sand-border);
  color: var(--text-forest-body);
}

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

.callout-box {
  background-color: var(--color-coral-subtle);
  border-left: 4px solid var(--color-coral);
  padding: 16px 20px;
  border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
  margin: 24px 0;
  font-size: 0.95rem;
}

.related-articles-box {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 2px solid var(--bg-sand-border);
}

/* ==========================================================================
   响应式断点控制
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .advantages-grid {
    grid-template-columns: 1fr;
  }

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

  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .tutorial-steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

@media (max-width: 768px) {
  .nav-links, .nav-cta-group .btn-secondary {
    display: none;
  }

  .mobile-toggle {
    display: flex;
  }

  .hero-specs-bar {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .spec-item {
    border-right: none;
    border-bottom: 1px dashed var(--bg-sand-border);
    padding-bottom: 8px;
  }

  .spec-item:last-child {
    border-bottom: none;
  }

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

  .tutorial-steps-grid {
    grid-template-columns: 1fr;
  }

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

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

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 430px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
  }

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

/* ==========================================================================
   prefers-reduced-motion 无障碍偏好支持
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}