/* IT专业顾问 - 术语表风格样式 */

:root {
  --accent-color: #795548;
  --accent-light: #a1887f;
  --accent-dark: #5d4037;
  --text-primary: #333;
  --text-secondary: #666;
  --text-muted: #999;
  --bg-primary: #fff;
  --bg-secondary: #f5f5f5;
  --bg-tertiary: #fafafa;
  --border-color: #e0e0e0;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.12);
  --radius: 8px;
  --radius-lg: 12px;
  --max-width: 1200px;
  --header-height: 64px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
}

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--accent-dark);
}

/* Header */
.header {
  height: var(--header-height);
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}

.logo {
  font-size: 22px;
  font-weight: 700;
  color: var(--accent-color);
}

.nav {
  display: flex;
  gap: 32px;
}

.nav a {
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 500;
}

.nav a:hover,
.nav a.active {
  color: var(--accent-color);
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-secondary);
  border-radius: 20px;
  padding: 8px 16px;
  width: 240px;
}

.search-box input {
  border: none;
  background: none;
  outline: none;
  font-size: 14px;
  width: 100%;
  color: var(--text-primary);
}

.search-box input::placeholder {
  color: var(--text-muted);
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
  padding: 60px 24px;
  text-align: center;
}

.hero-title {
  font-size: 42px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 32px;
}

/* Alphabet Navigation */
.az-nav {
  background: var(--bg-primary);
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
}

.az-nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.az-nav a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  transition: all 0.2s;
}

.az-nav a:hover,
.az-nav a.active {
  background: var(--accent-color);
  color: #fff;
}

/* Main Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 24px;
}

/* Section Title */
.section-title {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent-color);
  display: inline-block;
}

/* Definition Item */
.definitions-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.definition-item {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: box-shadow 0.2s;
}

.definition-item:hover {
  box-shadow: var(--shadow);
}

.definition-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.definition-letter {
  width: 40px;
  height: 40px;
  background: var(--accent-color);
  color: #fff;
  font-size: 18px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
}

.definition-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
}

.definition-title a:hover {
  color: var(--accent-color);
}

.definition-category {
  font-size: 13px;
  color: var(--accent-color);
  background: rgba(121, 85, 72, 0.1);
  padding: 4px 12px;
  border-radius: 12px;
  margin-left: auto;
}

.definition-content {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.definition-meta {
  display: flex;
  gap: 20px;
  font-size: 13px;
  color: var(--text-muted);
}

.definition-meta span {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Related Terms */
.related-terms {
  margin-top: 40px;
}

.related-terms-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.related-term-tag {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 14px;
  transition: all 0.2s;
}

.related-term-tag:hover {
  background: var(--accent-color);
  color: #fff;
}

/* Source Cite */
.source-cite {
  margin-top: 32px;
  padding: 16px 20px;
  background: var(--bg-tertiary);
  border-left: 4px solid var(--accent-color);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.source-cite-label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.source-cite-content {
  font-size: 14px;
  color: var(--text-secondary);
}

/* Three Column Layout */
.three-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.column {
  background: var(--bg-tertiary);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.column-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.column-list {
  list-style: none;
}

.column-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--border-color);
}

.column-list li:last-child {
  border-bottom: none;
}

.column-list a {
  color: var(--text-secondary);
  font-size: 14px;
  display: block;
}

.column-list a:hover {
  color: var(--accent-color);
}

/* Breadcrumb */
.breadcrumb {
  background: var(--bg-secondary);
  padding: 16px 24px;
}

.breadcrumb-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  font-size: 14px;
  color: var(--text-muted);
}

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

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

.breadcrumb-separator {
  margin: 0 8px;
  color: var(--text-muted);
}

.breadcrumb-current {
  color: var(--text-primary);
  font-weight: 500;
}

/* Article Page */
.article-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 24px;
}

.article-header {
  margin-bottom: 32px;
}

.article-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 16px;
}

.article-meta {
  display: flex;
  gap: 20px;
  font-size: 14px;
  color: var(--text-muted);
}

.article-category {
  color: var(--accent-color);
  font-weight: 500;
}

.article-content {
  font-size: 17px;
  line-height: 1.9;
  color: var(--text-primary);
}

.article-content h2 {
  font-size: 24px;
  font-weight: 600;
  margin: 40px 0 20px;
  color: var(--text-primary);
}

.article-content h3 {
  font-size: 20px;
  font-weight: 600;
  margin: 32px 0 16px;
  color: var(--text-primary);
}

.article-content p {
  margin-bottom: 20px;
}

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

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

.article-content strong {
  color: var(--accent-dark);
}

/* Definition Box */
.definition-box {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin: 32px 0;
}

.definition-box-title {
  font-size: 14px;
  color: var(--accent-color);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
  font-weight: 600;
}

.definition-box-content {
  font-size: 18px;
  line-height: 1.8;
  color: var(--text-primary);
}

/* Examples Section */
.examples-section {
  margin: 32px 0;
}

.examples-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.examples-list {
  list-style: none;
}

.examples-list li {
  padding: 12px 0;
  padding-left: 24px;
  position: relative;
  border-bottom: 1px solid var(--border-color);
}

.examples-list li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--accent-color);
  font-weight: bold;
}

/* Footer */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 40px 24px;
  margin-top: 60px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--accent-color);
  margin-bottom: 12px;
}

.footer-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.footer-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  font-size: 14px;
  color: var(--text-secondary);
}

.footer-links a:hover {
  color: var(--accent-color);
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 40px auto 0;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}

/* 404 Page */
.error-page {
  min-height: calc(100vh - var(--header-height) - 300px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px 24px;
}

.error-code {
  font-size: 120px;
  font-weight: 700;
  color: var(--accent-color);
  line-height: 1;
  margin-bottom: 16px;
  opacity: 0.8;
}

.error-title {
  font-size: 28px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.error-message {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.error-actions {
  display: flex;
  gap: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 500;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent-color);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-dark);
  color: #fff;
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--border-color);
  color: var(--text-primary);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .three-columns {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 768px) {
  .header-inner {
    padding: 0 16px;
  }

  .nav {
    display: none;
  }

  .search-box {
    width: 160px;
  }

  .hero {
    padding: 40px 16px;
  }

  .hero-title {
    font-size: 28px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

  .az-nav {
    padding: 16px;
  }

  .az-nav-inner {
    gap: 6px;
  }

  .az-nav a {
    width: 32px;
    height: 32px;
    font-size: 13px;
  }

  .container {
    padding: 24px 16px;
  }

  .definition-item {
    padding: 20px;
  }

  .definition-header {
    flex-wrap: wrap;
  }

  .definition-category {
    margin-left: 0;
    margin-top: 8px;
    width: 100%;
  }

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

  .article-title {
    font-size: 26px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .error-code {
    font-size: 80px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 24px;
  }

  .section-title {
    font-size: 20px;
  }

  .definition-title {
    font-size: 18px;
  }

  .article-container {
    padding: 24px 16px;
  }

  .definition-box {
    padding: 20px;
  }
}