/* ==========================================================================
   【风格 01 · 胡萝卜农场】主题通用样式表 - 悠兔 YouTu
   暖奶油底 #FFF6E9 | 主色胡萝卜橘 #FF8A3D | 文字暖棕 #5C4028 | 绿叶青 #6BB343
   ========================================================================== */
:root {
  --farm-bg: #FFF6E9;
  --farm-bg-card: #FFFFFF;
  --farm-bg-card-soft: #FFFBF5;
  --farm-primary: #FF8A3D;
  --farm-primary-hover: #FF751F;
  --farm-primary-dark: #D96A20;
  --farm-leaf: #6BB343;
  --farm-leaf-dark: #53962F;
  --farm-text: #5C4028;
  --farm-text-light: #8C6F56;
  --farm-text-muted: #7A5B40; /* 对比度优化至 > 5.5:1 (符合 WCAG AA 4.5:1) */
  --farm-border: #EEDCC8;
  --farm-border-bold: #E0C8AF;
  --farm-shadow-3d: 0 8px 0 #E8D2BB;
  --farm-shadow-hover: 0 12px 0 #DDC4AB;
  --farm-shadow-float: 0 16px 36px rgba(92, 64, 40, 0.08);
  --farm-radius-sm: 14px;
  --farm-radius-md: 22px;
  --farm-radius-lg: 32px;
  --farm-radius-pill: 999px;
  --font-farm: "ZCOOL QingKe HuangYou", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", sans-serif;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--farm-bg);
  color: var(--farm-text);
  font-family: var(--font-farm);
  -webkit-font-smoothing: antialiased;
}

body {
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
  background-color: var(--farm-bg);
  background-image: 
    radial-gradient(#F5E4CE 1.5px, transparent 1.5px),
    radial-gradient(#F8ECDE 1.5px, transparent 1.5px);
  background-size: 32px 32px;
  background-position: 0 0, 16px 16px;
  position: relative;
}

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

/* ================= 键盘可访问性与跳过主要内容 (Skip Link) ================= */
.skip-link {
  position: absolute;
  top: -80px;
  left: 20px;
  background: var(--farm-primary);
  color: #FFFFFF !important;
  padding: 12px 22px;
  border-radius: var(--farm-radius-pill);
  font-weight: 800;
  font-size: 0.95rem;
  z-index: 99999;
  border: 2px solid #FFFFFF;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
  transition: top 0.2s ease;
  text-decoration: none;
}

.skip-link:focus, .skip-link:focus-visible {
  top: 15px;
  outline: 3px solid var(--farm-text);
  outline-offset: 2px;
}

:focus-visible {
  outline: 3px solid var(--farm-primary);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ================= 锚点与平滑滚动偏移 (避免被 78px 页眉遮挡) ================= */
section[id], article[id], .content-block[id] {
  scroll-margin-top: 88px;
}

.container {
  width: 100%;
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

/* ================= 导航栏 Header ================= */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(255, 246, 233, 0.92);
  border-bottom: 2px solid var(--farm-border);
  box-shadow: 0 4px 18px rgba(92, 64, 40, 0.04);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 78px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--farm-text);
  letter-spacing: -0.5px;
}

.brand-logo-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}

.brand-logo span {
  color: var(--farm-primary);
  font-weight: 900;
  position: relative;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
  background: rgba(255, 255, 255, 0.8);
  padding: 6px 18px;
  border-radius: var(--farm-radius-pill);
  border: 1.5px solid var(--farm-border);
  box-shadow: 0 3px 0 var(--farm-border);
}

.nav-link {
  font-size: 0.94rem;
  color: var(--farm-text);
  font-weight: 700;
  transition: all 0.2s ease;
  padding: 6px 10px;
  border-radius: var(--farm-radius-pill);
}

.nav-link:hover {
  color: var(--farm-primary);
  background: #FFF0DE;
}

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

/* ================= 通用按钮 (3D 农场触感) ================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.96rem;
  font-weight: 800;
  border-radius: var(--farm-radius-pill);
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: center;
  border: 2px solid transparent;
  line-height: 1.2;
}

.btn-primary {
  background: var(--farm-primary);
  color: #FFFFFF;
  border-color: #E86B19;
  box-shadow: 0 5px 0 var(--farm-primary-dark), 0 8px 18px rgba(255, 138, 61, 0.35);
}

.btn-primary:hover {
  background: var(--farm-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 7px 0 var(--farm-primary-dark), 0 10px 22px rgba(255, 138, 61, 0.42);
}

.btn-primary:active {
  transform: translateY(3px);
  box-shadow: 0 2px 0 var(--farm-primary-dark);
}

.btn-secondary {
  background: #FFFFFF;
  color: var(--farm-text);
  border-color: var(--farm-border-bold);
  box-shadow: 0 5px 0 var(--farm-border-bold);
}

.btn-secondary:hover {
  background: #FFFBF5;
  color: var(--farm-primary);
  border-color: var(--farm-primary);
  transform: translateY(-2px);
  box-shadow: 0 7px 0 var(--farm-border-bold);
}

.btn-secondary:active {
  transform: translateY(3px);
  box-shadow: 0 2px 0 var(--farm-border-bold);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.1rem;
  border-radius: var(--farm-radius-pill);
}

.btn-block {
  width: 100%;
}

/* ================= 页面面包屑导航 (SEO & 结构化无障碍) ================= */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--farm-text-light);
  margin-bottom: 24px;
}

.breadcrumbs a {
  color: var(--farm-text);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.breadcrumbs a:hover {
  color: var(--farm-primary);
}

.breadcrumbs span.separator {
  color: var(--farm-border-bold);
}

/* ================= 独立子页面样式 (关于我们/条款/隐私/地图/文章) ================= */
.subpage-hero {
  padding: 55px 0 40px;
  text-align: center;
  background: rgba(255, 255, 255, 0.4);
  border-bottom: 2px solid var(--farm-border);
}

.subpage-body {
  max-width: 900px;
  margin: 50px auto 80px;
  padding: 0 24px;
}

.content-block {
  background: #FFFFFF;
  border: 2px solid var(--farm-border-bold);
  border-radius: var(--farm-radius-lg);
  padding: 38px 32px;
  margin-bottom: 30px;
  box-shadow: var(--farm-shadow-3d);
}

.content-block h2 {
  font-size: 1.45rem;
  color: var(--farm-text);
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
}

.content-block h2::before {
  content: '🥕';
  font-size: 1.2rem;
}

.content-block p {
  color: var(--farm-text-light);
  font-size: 0.98rem;
  line-height: 1.8;
  margin-bottom: 14px;
}

.content-block ul, .content-block ol {
  padding-left: 24px;
  color: var(--farm-text-light);
  font-size: 0.96rem;
  line-height: 1.8;
  margin-bottom: 16px;
}

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

.highlight-box {
  background: #FFF7EC;
  border-left: 4px solid var(--farm-primary);
  padding: 18px 22px;
  border-radius: 0 var(--farm-radius-sm) var(--farm-radius-sm) 0;
  margin: 20px 0;
  color: var(--farm-text);
  font-size: 0.96rem;
  line-height: 1.7;
}

.nodes-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 16px;
}

.nodes-table th, .nodes-table td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--farm-border);
  font-size: 0.94rem;
}

.nodes-table th {
  color: var(--farm-primary);
  font-weight: 800;
  background: #FFF8F0;
}

.nodes-table td {
  color: var(--farm-text);
}

/* ================= 知识科普与 SEO 文章样式 ================= */
.article-toc {
  background: #FFFFFF;
  border: 2px solid var(--farm-border-bold);
  border-radius: var(--farm-radius-lg);
  padding: 28px 30px;
  margin-bottom: 40px;
  box-shadow: var(--farm-shadow-3d);
}

.article-toc h3 {
  font-size: 1.2rem;
  color: var(--farm-text);
  margin-bottom: 18px;
  font-weight: 900;
}

.toc-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px 20px;
  list-style: none;
}

.toc-link {
  font-size: 0.94rem;
  color: var(--farm-text-light);
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s ease;
  font-weight: 600;
}

.toc-link:hover {
  color: var(--farm-primary);
  transform: translateX(4px);
}

.toc-badge {
  font-size: 0.78rem;
  padding: 2px 8px;
  background: #FFF0DE;
  color: var(--farm-primary);
  border-radius: 6px;
  font-weight: 900;
  border: 1px solid #FCD4AF;
}

.article-card {
  background: #FFFFFF;
  border: 2px solid var(--farm-border-bold);
  border-radius: var(--farm-radius-lg);
  padding: 40px 34px;
  margin-bottom: 34px;
  box-shadow: var(--farm-shadow-3d);
  transition: all 0.2s ease;
}

.article-card:hover {
  border-color: var(--farm-primary);
  box-shadow: var(--farm-shadow-hover);
}

.article-header {
  margin-bottom: 22px;
  padding-bottom: 18px;
  border-bottom: 2px dashed var(--farm-border);
}

.article-title {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--farm-text);
  line-height: 1.4;
  margin-bottom: 12px;
}

.article-meta-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  font-size: 0.84rem;
}

.article-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #FFF8F0;
  padding: 4px 12px;
  border-radius: var(--farm-radius-pill);
  color: var(--farm-text-light);
  font-weight: 600;
  border: 1px solid var(--farm-border);
}

.article-content {
  color: var(--farm-text);
  font-size: 1rem;
  line-height: 1.85;
}

.article-content h3 {
  font-size: 1.18rem;
  color: var(--farm-text);
  margin: 24px 0 12px;
  font-weight: 800;
}

.article-content p {
  margin-bottom: 14px;
}

.seo-link {
  color: var(--farm-primary);
  font-weight: 800;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.seo-link:hover {
  color: var(--farm-primary-dark);
}

.article-footer-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 24px;
  padding-top: 18px;
  border-top: 2px dashed var(--farm-border);
  font-size: 0.9rem;
  color: var(--farm-text-light);
}

/* ================= 原生 details/summary 语义 FAQ 样式 (默认展开) ================= */
details.faq-item {
  background: #FFFFFF;
  border: 2px solid var(--farm-border-bold);
  border-radius: var(--farm-radius-md);
  padding: 24px 28px;
  box-shadow: 0 5px 0 var(--farm-border);
  transition: all 0.2s ease;
  margin-bottom: 20px;
}

details.faq-item[open] {
  border-color: var(--farm-primary);
  box-shadow: 0 7px 0 var(--farm-border-bold);
}

summary.faq-q {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1.08rem;
  font-weight: 800;
  color: var(--farm-text);
  user-select: none;
}

summary.faq-q::-webkit-details-marker {
  display: none;
}

summary.faq-q .faq-q-left {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

summary.faq-q .faq-toggle-icon {
  font-size: 0.85rem;
  color: var(--farm-primary);
  transition: transform 0.2s ease;
}

details[open] summary.faq-q .faq-toggle-icon {
  transform: rotate(180deg);
}

.faq-a {
  font-size: 0.94rem;
  color: var(--farm-text-light);
  line-height: 1.75;
  padding-left: 38px;
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--farm-border);
}

/* 文章内专属 FAQ (details/summary) */
.article-faq-wrap {
  margin-top: 24px;
  padding: 22px 24px;
  background: #FFFBF5;
  border: 2px solid var(--farm-border-bold);
  border-radius: var(--farm-radius-md);
  box-shadow: 0 4px 0 var(--farm-border);
}

.article-faq-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.1rem;
  font-weight: 900;
  color: var(--farm-text);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px dashed var(--farm-border);
}

details.article-faq-item {
  margin-bottom: 14px;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--farm-border);
}

details.article-faq-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

summary.article-faq-q {
  list-style: none;
  cursor: pointer;
  font-size: 0.98rem;
  font-weight: 800;
  color: var(--farm-text);
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

summary.article-faq-q::-webkit-details-marker {
  display: none;
}

.article-faq-a {
  font-size: 0.93rem;
  color: var(--farm-text-light);
  line-height: 1.7;
  padding-left: 30px;
  margin-top: 8px;
}

/* ================= 页脚 Footer ================= */
.footer {
  background: #4D331C;
  border-top: 3px solid #3E2714;
  padding: 48px 0 36px;
  color: #EBD6C1;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 36px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 1.02rem;
  font-weight: 700;
  color: #F8E5D2;
  transition: all 0.2s ease;
  padding: 6px 12px;
  border-radius: var(--farm-radius-pill);
}

.footer-link:hover {
  color: #FFB834;
  background: rgba(255, 255, 255, 0.08);
}

.footer-copy {
  text-align: center;
  font-size: 0.88rem;
  color: #CBB096;
}

/* ================= 动效偏好媒体查询 (prefers-reduced-motion) ================= */
@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;
  }
  .bg-cloud, .bg-floater, .bouncing-carrot, .sparkle-leaf-star,
  .bunny-body-floating, .bunny-cheek-left, .bunny-cheek-right,
  .bunny-eye, .bunny-ear-left, .bunny-ear-right, .bunny-paw-left,
  .bunny-paw-right, .surrounding-float, .cross-star-twinkle {
    animation: none !important;
  }
}

/* ================= 响应式媒体查询 @media ================= */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .toc-list {
    grid-template-columns: 1fr;
  }
  .article-card {
    padding: 26px 20px;
  }
  .article-title {
    font-size: 1.25rem;
  }
  .footer-nav {
    flex-direction: column;
    gap: 14px;
  }
}