/* ========================================
   手办 DIY 教程平台 - 样式表
   风格: 指南文档风格 (docs-guide)
   主色调: #009688 (Teal)
   ======================================== */

/* CSS 变量定义 */
:root {
  --accent-color: #009688;
  --accent-light: #4db6ac;
  --accent-dark: #00796b;
  --text-primary: #212121;
  --text-secondary: #757575;
  --text-muted: #9e9e9e;
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --bg-card: #fafafa;
  --border-color: #e0e0e0;
  --success-color: #4caf50;
  --warning-color: #ff9800;
  --error-color: #f44336;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --transition: all 0.3s ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

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

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

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

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

ul, ol {
  list-style: none;
}

/* ========================================
   布局容器
   ======================================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 40px 0;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-title::before {
  content: '';
  width: 4px;
  height: 24px;
  background: var(--accent-color);
  border-radius: 2px;
}

/* ========================================
   页头 Header
   ======================================== */
.header {
  background: var(--bg-primary);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent-color), var(--accent-light));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.25rem;
}

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

.nav a {
  color: var(--text-secondary);
  font-weight: 500;
  padding: 8px 0;
  position: relative;
}

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

.nav a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-color);
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-secondary);
  border-radius: 24px;
  padding: 8px 16px;
  gap: 8px;
}

.search-box input {
  border: none;
  background: none;
  outline: none;
  width: 180px;
  font-size: 0.875rem;
}

.search-box button {
  border: none;
  background: none;
  cursor: pointer;
  color: var(--text-muted);
}

/* ========================================
   Hero 区域
   ======================================== */
.hero {
  background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-dark) 100%);
  color: white;
  padding: 80px 0;
  text-align: center;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.hero-desc {
  font-size: 1.125rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 32px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-top: 40px;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  display: block;
}

.stat-label {
  font-size: 0.875rem;
  opacity: 0.8;
}

/* ========================================
   按钮样式
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.9375rem;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

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

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

.btn-outline {
  background: transparent;
  color: var(--accent-color);
  border: 2px solid var(--accent-color);
}

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

.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
}

/* ========================================
   卡片样式
   ======================================== */
.card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-image {
  width: 100%;
  height: 180px;
  object-fit: cover;
  background: var(--bg-secondary);
}

.card-body {
  padding: 20px;
}

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.card-text {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* ========================================
   分类卡片
   ======================================== */
.category-card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 2px solid transparent;
}

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

.category-icon {
  width: 64px;
  height: 64px;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 1.75rem;
}

.category-card:hover .category-icon {
  background: var(--accent-color);
  color: white;
}

.category-name {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.category-count {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ========================================
   网格布局
   ======================================== */
.grid {
  display: grid;
  gap: 24px;
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

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

/* ========================================
   教程卡片 (带步骤数)
   ======================================== */
.guide-card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border-left: 4px solid var(--accent-color);
}

.guide-card:hover {
  box-shadow: var(--shadow-md);
}

.guide-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 12px;
}

.guide-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
}

.guide-steps {
  background: var(--accent-color);
  color: white;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
}

.guide-desc {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 16px;
}

.guide-meta {
  display: flex;
  gap: 16px;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.difficulty {
  display: flex;
  gap: 2px;
}

.difficulty-star {
  color: var(--accent-color);
}

.difficulty-star.empty {
  color: var(--border-color);
}

/* ========================================
   步骤组件
   ======================================== */
.step-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.step-item {
  display: flex;
  gap: 16px;
  padding: 20px;
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.step-number {
  width: 40px;
  height: 40px;
  background: var(--accent-color);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
}

.step-content {
  flex: 1;
}

.step-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.step-desc {
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

/* 步骤导航 */
.step-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.step-nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
}

.step-nav-item:hover {
  background: var(--bg-card);
}

.step-nav-item.active {
  background: var(--accent-color);
  color: white;
}

.step-nav-item.completed .step-status {
  color: var(--success-color);
}

.step-nav-item.active .step-status {
  color: white;
}

.step-status {
  font-size: 1rem;
}

/* ========================================
   提示框组件
   ======================================== */
.tip-box {
  padding: 16px 20px;
  border-radius: var(--radius-md);
  margin: 20px 0;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.tip-box.info {
  background: #e3f2fd;
  border-left: 4px solid #2196f3;
}

.tip-box.warning {
  background: #fff3e0;
  border-left: 4px solid var(--warning-color);
}

.tip-box.success {
  background: #e8f5e9;
  border-left: 4px solid var(--success-color);
}

.tip-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
}

.tip-content {
  flex: 1;
}

.tip-title {
  font-weight: 600;
  margin-bottom: 4px;
}

.tip-text {
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

/* ========================================
   检查清单
   ======================================== */
.checklist {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.checklist-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.checklist-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
}

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

.checklist-checkbox {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.checklist-item.checked .checklist-checkbox {
  background: var(--success-color);
  border-color: var(--success-color);
  color: white;
}

.checklist-text {
  flex: 1;
}

.checklist-item.checked .checklist-text {
  text-decoration: line-through;
  color: var(--text-muted);
}

/* ========================================
   面包屑导航
   ======================================== */
.breadcrumb {
  background: var(--bg-primary);
  padding: 16px 0;
  border-bottom: 1px solid var(--border-color);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
}

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

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

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

.breadcrumb-separator {
  color: var(--text-muted);
}

/* ========================================
   文章列表
   ======================================== */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.article-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
}

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

.article-bullet {
  width: 6px;
  height: 6px;
  background: var(--accent-color);
  border-radius: 50%;
  flex-shrink: 0;
}

.article-link {
  color: var(--text-primary);
  font-size: 0.9375rem;
}

.article-link:hover {
  color: var(--accent-color);
}

/* ========================================
   分页
   ======================================== */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 32px;
}

.page-btn {
  min-width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 12px;
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: var(--transition);
}

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

.page-btn.active {
  background: var(--accent-color);
  color: white;
}

.page-btn.disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ========================================
   侧边栏
   ======================================== */
.sidebar-section {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 20px;
}

.sidebar-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent-color);
}

/* ========================================
   内容区域
   ======================================== */
.content-wrapper {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 32px;
}

.main-content {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.article-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.article-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.3;
}

.article-meta {
  display: flex;
  gap: 24px;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.article-body {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.article-body h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 32px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 24px 0 12px;
}

.article-body p {
  margin-bottom: 16px;
}

.article-body ul,
.article-body ol {
  margin-bottom: 16px;
  padding-left: 24px;
}

.article-body ul li {
  list-style: disc;
  margin-bottom: 8px;
}

.article-body ol li {
  list-style: decimal;
  margin-bottom: 8px;
}

.article-image {
  width: 100%;
  border-radius: var(--radius-md);
  margin: 24px 0;
}

/* ========================================
   404 页面
   ======================================== */
.error-page {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 20px;
}

.error-code {
  font-size: 8rem;
  font-weight: 700;
  color: var(--accent-color);
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.error-desc {
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* ========================================
   页脚 Footer
   ======================================== */
.footer {
  background: var(--text-primary);
  color: white;
  padding: 48px 0 24px;
  margin-top: 60px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
}

.footer-brand {
  max-width: 300px;
}

.footer-logo {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-desc {
  color: rgba(255,255,255,0.7);
  font-size: 0.875rem;
  line-height: 1.6;
}

.footer-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: rgba(255,255,255,0.7);
  font-size: 0.875rem;
}

.footer-links a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  text-align: center;
  color: rgba(255,255,255,0.5);
  font-size: 0.875rem;
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
  .content-wrapper {
    grid-template-columns: 1fr;
  }

  .sidebar {
    order: 2;
  }

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

@media (max-width: 768px) {
  .header .container {
    flex-wrap: wrap;
    height: auto;
    padding: 12px 20px;
  }

  .nav {
    order: 3;
    width: 100%;
    justify-content: center;
    margin-top: 12px;
    gap: 20px;
  }

  .search-box {
    display: none;
  }

  .hero {
    padding: 48px 0;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .hero-stats {
    gap: 24px;
  }

  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-2 {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 32px 0;
  }

  .section-title {
    font-size: 1.375rem;
  }

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

  .main-content {
    padding: 20px;
  }

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

  .error-code {
    font-size: 5rem;
  }
}

@media (max-width: 480px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    flex-direction: column;
    gap: 16px;
  }

  .step-item {
    flex-direction: column;
    gap: 12px;
  }
}