:root {
  --primary: #4a7c59;
  --primary-dark: #3d6648;
  --primary-light: #5a9469;
  --accent: #d4a574;
  --accent-dark: #b8905e;
  --bg-light: #f8f9f5;
  --bg-white: #ffffff;
  --text-primary: #2c3e2d;
  --text-secondary: #5a6b5d;
  --text-muted: #8a9a8c;
  --border: #e0e5dd;
  --card-shadow: 0 2px 12px rgba(74, 124, 89, 0.08);
  --card-shadow-hover: 0 8px 30px rgba(74, 124, 89, 0.15);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.navbar {
  background: var(--bg-white);
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
  padding: 0.75rem 0;
}

.navbar-brand {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.navbar-brand:hover {
  color: var(--primary-dark);
}

.navbar-nav .nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 1rem;
  transition: color 0.2s;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
  color: var(--primary);
}

.btn-primary-custom {
  background: var(--primary);
  color: white;
  border: none;
  padding: 0.6rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  transition: all 0.2s;
  display: inline-block;
  text-decoration: none;
}

.btn-primary-custom:hover {
  background: var(--primary-dark);
  color: white;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(74, 124, 89, 0.3);
}

.btn-outline-custom {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
  padding: 0.5rem 1.4rem;
  border-radius: 8px;
  font-weight: 600;
  transition: all 0.2s;
  display: inline-block;
  text-decoration: none;
}

.btn-outline-custom:hover {
  background: var(--primary);
  color: white;
}

.hero-gradient {
  background: linear-gradient(135deg, #4a7c59 0%, #5a9469 50%, #7ab885 100%);
  color: white;
  padding: 4rem 0 3rem;
  position: relative;
  overflow: hidden;
}

.hero-gradient::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='60' viewBox='0 0 60 60'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M30 30c0-16.569 13.431-30 30-30v60C43.431 60 30 46.569 30 30z'/%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.3;
}

.hero-badge {
  display: inline-block;
  background: rgba(255,255,255,0.2);
  color: white;
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  margin-right: 0.5rem;
}

.hero-title {
  font-size: 2.8rem;
  font-weight: 700;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.1rem;
  opacity: 0.95;
  margin-bottom: 1.5rem;
  max-width: 520px;
}

.hero-card {
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(10px);
  border-radius: 16px;
  padding: 2rem;
  border: 1px solid rgba(255,255,255,0.25);
}

.hero-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.hero-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.hero-card li {
  padding: 0.5rem 0;
  padding-left: 1.5rem;
  position: relative;
  font-size: 0.95rem;
}

.hero-card li::before {
  content: '🌾';
  position: absolute;
  left: 0;
  top: 0.5rem;
}

.section {
  padding: 4rem 0;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.category-card {
  background: var(--bg-white);
  border-radius: 16px;
  padding: 2rem;
  border: 1px solid var(--border);
  transition: all 0.3s ease;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--primary-light);
}

.category-badge {
  display: inline-block;
  background: var(--bg-light);
  color: var(--primary);
  padding: 0.25rem 0.7rem;
  border-radius: 12px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.category-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.category-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  flex: 1;
}

.category-link {
  color: var(--primary);
  font-weight: 600;
  text-decoration: none;
  font-size: 0.9rem;
  margin-top: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.category-link:hover {
  color: var(--primary-dark);
  gap: 0.5rem;
}

.featured-guide {
  background: var(--bg-light);
  border-radius: 12px;
  padding: 1.5rem;
  border-left: 4px solid var(--primary);
  transition: all 0.2s;
}

.featured-guide:hover {
  background: #f0f3ec;
  transform: translateX(4px);
}

.featured-guide .guide-tag {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.featured-guide h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0.5rem 0;
}

.featured-guide p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.featured-guide a {
  color: var(--primary);
  font-weight: 600;
  text-decoration: none;
  font-size: 0.88rem;
}

.featured-guide a:hover {
  color: var(--primary-dark);
}

.knowledge-map {
  background: var(--bg-light);
  border-radius: 20px;
  padding: 3rem 0;
}

.how-to-use {
  background: var(--bg-white);
}

.how-to-use-item {
  padding: 1.5rem;
  border-radius: 12px;
  background: var(--bg-light);
  transition: all 0.2s;
  height: 100%;
}

.how-to-use-item:hover {
  background: #eef3ea;
}

.how-to-use-item strong {
  display: inline-block;
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
  color: var(--text-primary);
}

.how-to-use-item p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  line-height: 1.65;
}

.content-page .lead {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 1.75rem;
  font-weight: 400;
  line-height: 1.6;
}

.content-page .how-to-use-item p,
.content-page .category-card p,
.content-page .featured-guide p {
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.how-to-use-item .step-num {
  display: inline-block;
  width: 2rem;
  height: 2rem;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  text-align: center;
  line-height: 2rem;
  font-weight: 700;
  margin-right: 0.75rem;
}

.editorial-section {
  background: linear-gradient(180deg, var(--bg-light) 0%, var(--bg-white) 100%);
}

.editorial-feature {
  text-align: center;
  padding: 1.5rem;
}

.editorial-feature h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--primary);
}

.editorial-feature p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.footer {
  background: #2c3e2d;
  color: #b8c5ba;
  padding: 3rem 0 1.5rem;
}

.footer h5 {
  color: white;
  font-weight: 600;
  margin-bottom: 1rem;
}

.footer a {
  color: #b8c5ba;
  text-decoration: none;
  transition: color 0.2s;
}

.footer a:hover {
  color: white;
}

.footer ul {
  list-style: none;
  padding: 0;
}

.footer li {
  margin-bottom: 0.5rem;
}

.footer-bottom {
  border-top: 1px solid #3d4e3f;
  margin-top: 2rem;
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.85rem;
}

.content-page {
  padding: 3rem 0;
}

.content-page > .container {
  max-width: 860px;
}

.content-page h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  line-height: 1.3;
}

.content-page h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-top: 3rem;
  margin-bottom: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  line-height: 1.35;
}

.content-page h2:first-of-type {
  border-top: none;
  padding-top: 0;
  margin-top: 1.5rem;
}

.content-page h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

.content-page p {
  font-size: 1.05rem;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
  word-break: break-word;
}

.content-page ul,
.content-page ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

.content-page li {
  margin-bottom: 0.5rem;
  font-size: 1rem;
  line-height: 1.8;
}

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

.content-page a {
  color: var(--primary);
  text-decoration: underline;
  text-decoration-color: rgba(74, 124, 89, 0.3);
  text-underline-offset: 2px;
  transition: text-decoration-color 0.2s;
}

.content-page a:hover {
  text-decoration-color: var(--primary);
}

.content-page blockquote {
  border-left: 4px solid var(--accent);
  padding: 0.75rem 1.25rem;
  margin: 1.5rem 0;
  background: var(--bg-light);
  border-radius: 0 8px 8px 0;
  color: var(--text-secondary);
  font-style: italic;
}

.content-page blockquote p:last-child {
  margin-bottom: 0;
}

.content-page img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 1.5rem 0;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.content-page table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
  font-size: 0.95rem;
}

.content-page th {
  background: var(--primary);
  color: white;
  padding: 0.7rem 0.9rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.9rem;
  white-space: nowrap;
}

.content-page td {
  padding: 0.65rem 0.9rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.92rem;
  line-height: 1.5;
}

.content-page tr:last-child td {
  border-bottom: none;
}

.content-page tr:hover td {
  background: var(--bg-light);
}

.last-updated {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 2rem;
  font-style: italic;
}

.breadcrumb {
  background: var(--bg-light);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  margin-bottom: 2rem;
}

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

.breadcrumb a:hover {
  text-decoration: underline;
}

.info-box {
  background: #fff9e6;
  border-left: 4px solid var(--accent);
  padding: 1.25rem 1.5rem;
  border-radius: 0 8px 8px 0;
  margin: 1.75rem 0;
}

.info-box strong {
  color: var(--accent-dark);
}

.info-box p,
.tip-box p {
  margin-bottom: 0.5rem;
}

.info-box p:last-child,
.tip-box p:last-child {
  margin-bottom: 0;
}

.info-box ul,
.tip-box ul {
  margin-top: 0.5rem;
  margin-bottom: 0;
  padding-left: 1.3rem;
}

.info-box li,
.tip-box li {
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 0.35rem;
}

.tip-box {
  background: #e8f5e9;
  border-left: 4px solid var(--primary);
  padding: 1.25rem 1.5rem;
  border-radius: 0 8px 8px 0;
  margin: 1.75rem 0;
}

.tip-box strong {
  color: var(--primary-dark);
}

.sticky-sidebar {
  position: sticky;
  top: 90px;
}

.toc-link {
  display: block;
  padding: 0.4rem 0.75rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-left: 2px solid var(--border);
  font-size: 0.9rem;
  transition: all 0.2s;
}

.toc-link:hover,
.toc-link.active {
  color: var(--primary);
  border-left-color: var(--primary);
  background: var(--bg-light);
}

@media (max-width: 991px) {
  .hero-title {
    font-size: 2rem;
  }

  .hero-gradient {
    padding: 3rem 0;
  }

  .section {
    padding: 2.5rem 0;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .content-page h1 {
    font-size: 1.8rem;
  }

  .content-page h2 {
    font-size: 1.5rem;
  }

  .content-page h3 {
    font-size: 1.2rem;
  }

  .navbar-collapse {
    background: var(--bg-white);
    padding: 1rem;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    margin-top: 0.5rem;
  }
}

@media (max-width: 768px) {
  .content-page {
    padding: 2rem 0;
  }

  .content-page > .container {
    padding-left: 1.2rem;
    padding-right: 1.2rem;
  }

  .content-page p {
    font-size: 1rem;
  }

  .content-page table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    white-space: nowrap;
  }

  .content-page thead {
    display: table-header-group;
  }

  .content-page tbody {
    display: table-row-group;
  }

  .content-page tr {
    display: table-row;
  }

  .content-page th,
  .content-page td {
    padding: 0.6rem 0.75rem;
  }

  .how-to-use-item {
    padding: 1.2rem;
  }

  .hero-card {
    padding: 1.5rem;
  }
}

@media (max-width: 576px) {
  .content-page h1 {
    font-size: 1.6rem;
  }

  .content-page h2 {
    font-size: 1.35rem;
    margin-top: 2.25rem;
    padding-top: 1.25rem;
  }

  .content-page h3 {
    font-size: 1.1rem;
  }

  .breadcrumb {
    padding: 0.6rem 0.8rem;
    font-size: 0.9rem;
  }

  .info-box,
  .tip-box {
    padding: 1rem 1.1rem;
    margin: 1.25rem 0;
  }
}

.average-calc-form {
  background: var(--bg-light);
  border-radius: 12px;
  padding: 1.5rem;
  margin: 2rem 0;
}

.average-calc-form label {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  display: block;
}

.average-calc-form input,
.average-calc-form select {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  margin-bottom: 1rem;
}

.average-calc-form input:focus,
.average-calc-form select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(74, 124, 89, 0.15);
}

.result-box {
  background: var(--primary);
  color: white;
  border-radius: 12px;
  padding: 1.5rem;
  text-align: center;
  margin-top: 1.5rem;
}

.result-box .result-label {
  font-size: 0.9rem;
  opacity: 0.9;
  margin-bottom: 0.5rem;
}

.result-box .result-value {
  font-size: 2rem;
  font-weight: 700;
}