/* ============================================
   TechShare 主题样式 - 手绘明亮风格
   ============================================ */

/* CSS Variables */
:root {
  --primary: #6ECEDA;
  --secondary: #C77DFF;
  --accent: #FFAFCC;
  --success: #A0E7A0;
  --warning: #FFD93D;
  --background: #FFF9F5;
  --card-bg: #FFFFFF;
  --text: #4A4A4A;
  --text-light: #8A8A8A;
  --border: #F0E6E0;
  
  --shadow-sm: 0 2px 8px rgba(110, 206, 218, 0.15);
  --shadow-md: 0 4px 16px rgba(110, 206, 218, 0.2);
  --shadow-lg: 0 8px 32px rgba(199, 125, 255, 0.15);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  
  --font-display: 'Quicksand', 'Comic Neue', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', sans-serif;
  
  --sidebar-width: 260px;
  --topnav-height: 70px;
}

/* Reset & Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--background);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
}

/* 顶部导航栏 */
.top-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--topnav-height);
  background: rgba(255, 249, 245, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 2px dashed var(--primary);
  z-index: 1000;
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  transition: transform 0.3s ease;
}

.logo:hover {
  transform: scale(1.05);
}

.logo-icon {
  width: 40px;
  height: 40px;
  color: var(--primary);
}

.logo-text {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.main-nav {
  display: flex;
  gap: 8px;
}

.nav-item {
  padding: 8px 16px;
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all 0.3s ease;
  position: relative;
}

.nav-item::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 2px;
  transition: transform 0.3s ease;
}

.nav-item:hover::after,
.nav-item.active::after {
  transform: translateX(-50%) scaleX(1);
}

.nav-item:hover,
.nav-item.active {
  color: var(--primary);
  background: rgba(110, 206, 218, 0.1);
}

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

.search-btn {
  width: 40px;
  height: 40px;
  border: 2px dashed var(--border);
  background: var(--card-bg);
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.search-btn svg {
  width: 20px;
  height: 20px;
  color: var(--text-light);
}

.search-btn:hover {
  border-color: var(--primary);
  background: rgba(110, 206, 218, 0.1);
}

.search-btn:hover svg {
  color: var(--primary);
}

/* 主容器布局 */
.main-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: calc(var(--topnav-height) + 30px) 24px 60px;
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr 300px;
  gap: 30px;
}

/* 左侧边栏 */
.left-sidebar {
  position: sticky;
  top: calc(var(--topnav-height) + 30px);
  height: fit-content;
}

.sidebar-section {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 24px;
  border: 2px dashed var(--border);
  transition: all 0.3s ease;
}

.sidebar-section:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.sidebar-title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.sidebar-title svg {
  width: 20px;
  height: 20px;
  color: var(--primary);
}

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

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  text-decoration: none;
  color: var(--text);
  border-radius: var(--radius-md);
  transition: all 0.3s ease;
}

.nav-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
  transition: all 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
  background: linear-gradient(135deg, rgba(110, 206, 218, 0.15), rgba(199, 125, 255, 0.1));
}

.nav-link:hover .nav-dot,
.nav-link.active .nav-dot {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  transform: scale(1.3);
}

.nav-link.active {
  color: var(--primary);
  font-weight: 600;
}

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

.stat-item {
  background: linear-gradient(135deg, rgba(110, 206, 218, 0.1), rgba(199, 125, 255, 0.05));
  border-radius: var(--radius-md);
  padding: 14px;
  text-align: center;
  border: 2px dashed var(--border);
  transition: all 0.3s ease;
}

.stat-item:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
}

.stat-number {
  display: block;
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 12px;
  color: var(--text-light);
}

/* 主内容区 */
.main-content {
  min-height: 600px;
}

.hero-banner {
  background: linear-gradient(135deg, #E8F6F8 0%, #F5E6F7 50%, #FDE8ED 100%);
  border-radius: var(--radius-xl);
  padding: 50px 40px;
  text-align: center;
  margin-bottom: 30px;
  border: 3px dashed var(--primary);
  position: relative;
  overflow: hidden;
}

.hero-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(110, 206, 218, 0.1) 0%, transparent 60%);
  animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.1); opacity: 0.8; }
}

.hero-title {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
  position: relative;
}

.hero-subtitle {
  font-size: 16px;
  color: var(--text-light);
  max-width: 500px;
  margin: 0 auto;
  position: relative;
}

.category-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 30px;
}

.category-tab {
  padding: 8px 18px;
  background: var(--card-bg);
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--text);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.3s ease;
}

.category-tab:hover,
.category-tab.active {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.post-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.post-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 2px dashed var(--border);
  transition: all 0.3s ease;
  display: grid;
  grid-template-columns: 200px 1fr;
}

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

.post-cover {
  height: 180px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.post-cover::before {
  content: '';
  position: absolute;
  width: 120px;
  height: 120px;
  border: 3px dashed rgba(255,255,255,0.3);
  border-radius: 50%;
}

.post-cover-icon {
  width: 60px;
  height: 60px;
  color: white;
  opacity: 0.8;
}

.post-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 10px;
  font-size: 13px;
  color: var(--text-light);
}

.post-date {
  display: flex;
  align-items: center;
  gap: 4px;
}

.post-tags {
  display: flex;
  gap: 6px;
}

.post-tag {
  padding: 2px 8px;
  background: linear-gradient(135deg, rgba(110, 206, 218, 0.15), rgba(199, 125, 255, 0.1));
  border-radius: var(--radius-sm);
  color: var(--primary);
  font-size: 12px;
}

.post-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 10px;
  text-decoration: none;
  transition: color 0.3s ease;
}

.post-title:hover {
  color: var(--primary);
}

.post-excerpt {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.6;
  margin-bottom: 12px;
  flex-grow: 1;
}

.post-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.post-stats {
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: var(--text-light);
}

.post-stat {
  display: flex;
  align-items: center;
  gap: 4px;
}

.post-stat svg {
  width: 16px;
  height: 16px;
}

.read-more {
  padding: 8px 18px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  text-decoration: none;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.3s ease;
}

.read-more:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-sm);
}

/* 专题页面 */
.topics-header {
  text-align: center;
  margin-bottom: 40px;
}

.topics-title {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.topics-subtitle {
  color: var(--text-light);
  font-size: 16px;
}

.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.topic-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 2px dashed var(--border);
  transition: all 0.3s ease;
}

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

.topic-icon {
  width: 56px;
  height: 56px;
  margin-bottom: 16px;
  color: var(--secondary);
}

.topic-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}

.topic-desc {
  font-size: 14px;
  color: var(--text-light);
  margin-bottom: 16px;
  line-height: 1.6;
}

.topic-meta {
  display: flex;
  gap: 16px;
  margin-bottom: 16px;
  font-size: 13px;
  color: var(--text-light);
}

.topic-badge {
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 500;
}

.topic-badge.level-beginner {
  background: rgba(160, 231, 160, 0.3);
  color: #2d8a2d;
}

.topic-badge.level-intermediate {
  background: rgba(110, 206, 218, 0.3);
  color: #2a8a94;
}

.topic-badge.level-advanced {
  background: rgba(199, 125, 255, 0.3);
  color: #8a3ac7;
}

.topic-start {
  width: 100%;
  padding: 10px;
  background: linear-gradient(135deg, var(--secondary), var(--accent));
  color: white;
  text-align: center;
  text-decoration: none;
  border-radius: var(--radius-md);
  font-weight: 500;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
}

.topic-start:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-sm);
}

/* 右侧边栏 */
.right-sidebar {
  position: sticky;
  top: calc(var(--topnav-height) + 30px);
  height: fit-content;
}

.contribution-card {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  padding: 16px;
  border: 2px dashed var(--border);
}

.contribution-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.contribution-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #ccc;
}

.contribution-dot.online {
  background: var(--success);
  box-shadow: 0 0 8px var(--success);
}

.contribution-name {
  font-size: 14px;
  font-weight: 500;
}

.contribution-graph {
  display: flex;
  gap: 3px;
  overflow-x: auto;
  padding-bottom: 8px;
}

.contribution-week {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.contribution-day {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  background: #ebedf0;
}

.contribution-day.level-0 { background: #ebedf0; }
.contribution-day.level-1 { background: #9be9a8; }
.contribution-day.level-2 { background: #40c463; }
.contribution-day.level-3 { background: #30a14e; }

.contribution-footer {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-light);
  margin-top: 8px;
}

.author-card {
  text-align: center;
}

.author-avatar {
  width: 80px;
  height: 80px;
  margin: 0 auto 12px;
  color: var(--secondary);
}

.author-name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.author-bio {
  font-size: 13px;
  color: var(--text-light);
  margin-bottom: 12px;
  line-height: 1.5;
}

.author-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  margin-bottom: 16px;
}

.tag {
  padding: 4px 10px;
  background: linear-gradient(135deg, rgba(110, 206, 218, 0.2), rgba(199, 125, 255, 0.15));
  border-radius: var(--radius-lg);
  font-size: 12px;
  color: var(--text);
}

.author-social {
  display: flex;
  justify-content: center;
  gap: 12px;
}

.social-link {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--background);
  border-radius: var(--radius-md);
  color: var(--text);
  transition: all 0.3s ease;
}

.social-link svg {
  width: 20px;
  height: 20px;
}

.social-link:hover {
  background: var(--primary);
  color: white;
}

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

.recommend-item {
  display: flex;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--border);
}

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

.recommend-num {
  width: 24px;
  height: 24px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
  flex-shrink: 0;
}

.recommend-content {
  flex: 1;
  min-width: 0;
}

.recommend-title {
  display: block;
  font-size: 13px;
  color: var(--text);
  text-decoration: none;
  margin-bottom: 4px;
  transition: color 0.3s ease;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.recommend-title:hover {
  color: var(--primary);
}

.recommend-views {
  font-size: 11px;
  color: var(--text-light);
}

/* 页脚 */
.site-footer {
  text-align: center;
  padding: 30px;
  color: var(--text-light);
  font-size: 14px;
  border-top: 2px dashed var(--border);
  margin-top: 40px;
}

/* 响应式设计 */
@media (max-width: 1200px) {
  .main-container {
    grid-template-columns: 240px 1fr 260px;
  }
}

@media (max-width: 992px) {
  .main-container {
    grid-template-columns: 1fr;
  }
  
  .left-sidebar,
  .right-sidebar {
    position: static;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
  }
  
  .sidebar-section {
    margin-bottom: 0;
  }
  
  .main-nav {
    display: none;
  }
}

@media (max-width: 768px) {
  .nav-container {
    padding: 0 16px;
  }
  
  .main-container {
    padding: calc(var(--topnav-height) + 20px) 16px 40px;
  }
  
  .hero-banner {
    padding: 30px 20px;
  }
  
  .hero-title {
    font-size: 26px;
  }
  
  .hero-subtitle {
    font-size: 14px;
  }
  
  .post-card {
    grid-template-columns: 1fr;
  }
  
  .post-cover {
    height: 140px;
  }
  
  .category-tabs {
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 10px;
  }
  
  .category-tab {
    flex-shrink: 0;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.post-card,
.topic-card,
.sidebar-section {
  animation: fadeInUp 0.6s ease-out;
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--background);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(var(--primary), var(--secondary));
  border-radius: 4px;
}