:root {
  --primary-color: #ff6b6b;
  --secondary-color: #4ecdc4;
  --accent-color: #ffd166;
  --background-color: #f9f9f9;
  --text-color: #333;
  --light-text: #666;
  --border-color: #e0e0e0;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}


main {
  padding: 40px 0;
}

section {
  margin-bottom: 50px;
  background-color: white;
  border-radius: 10px;
  padding: 30px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

h1 {
  color: var(--primary-color);
  font-size: 2.2rem;
  margin-bottom: 20px;
  text-align: center;
}

h2 {
  color: var(--secondary-color);
  margin: 25px 0 15px;
  font-size: 1.8rem;
}

h3 {
  color: var(--accent-color);
  margin: 20px 0 12px;
  font-size: 1.4rem;
}

p {
  margin-bottom: 15px;
  color: var(--text-color);
}

a {
  text-decoration: none;
}

.highlight {
  background-color: var(--accent-color);
  padding: 2px 6px;
  border-radius: 3px;
  font-weight: 500;
}

.breadcrumb {
  margin: 20px 0;
  font-size: 1.0rem;
  color: var(--light-text);
}

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

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

.btn {
  display: inline-block;
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 5px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.3s ease;
  text-decoration: none;
  text-align: center;
  margin-right: 10px;
  margin-bottom: 10px;
}

.btn:hover {
  background-color: #ff4d4d;
}

.btn-secondary {
  background-color: var(--secondary-color);
}

.btn-secondary:hover {
  background-color: #37b0a8;
}

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

.btn-accent:hover {
  background-color: #ffc14d;
}

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

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

/* 导航栏基础样式 */
header {
  background-color: var(--background-color);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  position: sticky;
  height: 160px;
  top: 0;
  transition: all 0.3s ease;
  z-index: 1000;
}

/* Logo样式 */
.logo {
  width: 130px;
  height: 130px;
  border-radius: 50%;
  transition: all 0.3s ease;
}

/* 缩小后的header样式 */
.small-header {
  height: 80px !important;
}

.small-header #logo-img {
  width:70px !important;
  height:70px !important;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
  min-height: 80px;
}


.nav-logo {
  display: flex;
  align-items: center;
}

.nav-logo img {
  /* width: 40px;
  height: 40px; */
  margin-right: 10px;
}

.nav-logo span {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--primary-color);
}

/* 桌面端导航菜单样式 */
.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
}

.nav-menu li {
  margin-left: 30px;
}

.nav-menu a {
  text-decoration: none;
  color: var(--text-color);
  font-size: 1.15rem;
  font-weight: bold;
  transition: color 0.3s ease;
  position: relative;
}

.nav-menu a.active {
  color: var(--secondary-color);
}

.nav-menu a:hover {
  color: var(--primary-color);
}

.nav-menu a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -5px;
  left: 0;
  background-color: var(--primary-color);
  transition: width 0.3s ease;
}

.nav-menu a:hover::after {
  width: 100%;
}

/* 下拉内容初始隐藏 */
.dropdown-menu-btn {
  display: none;
  position: absolute;
  background-color: var(--background-color);
  min-width: 200px;
  margin-top: 25px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1000;
}

/* 下拉菜单项样式 */
.dropdown-menu-btn a {
  color: var(--text-color);
  padding: 12px 16px;
  text-decoration: none;
  display: block;
}

.dropdown-menu-btn a.selected {
  color: var(--primary-color);
}

/* 鼠标悬停时显示下拉菜单 */
.dropdown-menu:hover .dropdown-menu-btn {
  display: block;
}


/* 搜索图标样式 */
.search-icon {
  margin-left: 20px;
  color: var(--text-color);
  font-size: 1.2rem;
  cursor: pointer;
  transition: color 0.3s ease;
}

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

/* 移动端菜单按钮样式 */
.menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.8rem;
  color: var(--text-color);
  cursor: pointer;
}

/* 移动端下拉菜单样式 */
.mobile-menu {
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  background-color: white;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  padding: 15px 20px;
  display: none;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.mobile-menu ul {
  list-style: none;
}

.mobile-menu li {
  margin: 15px 0;
}

.mobile-menu a {
  text-decoration: none;
  color: var(--text-color);
  font-weight: 600;
  display: block;
  padding: 8px 0;
  border-bottom: 1px solid #f0f0f0;
}

.mobile-menu a:hover {
  color: var(--primary-color);
}

.mobile-menu a.active {
  color: var(--secondary-color);
}

.coloring-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 25px;
}

.coloring-card {
  background-color: white;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.coloring-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 15px rgba(0, 0, 0, 0.15);
}

.coloring-image {
  aspect-ratio: 1/1;
  background-color: #fff;
  overflow: hidden;
  position: relative;
}

.coloring-image img {
  width: 100%;
  height: auto; 
  object-fit: contain;
  aspect-ratio: 1;
  display: block;
  transition: transform 0.5s ease;
}

.coloring-card:hover .coloring-image img {
  transform: scale(1.05);
}

.coloring-content {
  padding: 15px;
}

.coloring-title {
  font-weight: 600;
  margin-bottom: 5px;
  color: var(--text-color);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.coloring-category {
  font-size: 0.9rem;
  color: var(--light-text);
}

.coloring-content {
  padding: 15px;
}

.coloring-title {
  font-weight: 600;
  margin-bottom: 5px;
  color: var(--text-color);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.coloring-author {
  font-size: 0.85rem;
  color: var(--light-text);
  margin-bottom: 3px;
}

.coloring-author a {
  color: var(--primary-color);
}

.coloring-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--light-text);
  margin-bottom: 8px;
}

.coloring-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.tag {
  background-color: var(--background-color);
  color: var(--secondary-color);
  padding: 3px 8px;
  border-radius: 15px;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.tag:hover {
  background-color: var(--secondary-color);
  color: white;
}

/* 进度角标样式 */
.progress-badge {
  position: absolute;
  top: 0px;
  right: 0px;
  background: #FF5252;
  color: white;
  padding: 4px 8px;
  border-radius: 0px 8px 0px 8px;
  font-size: 12px;
  font-family: Arial, sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  z-index: 1000;
}


@media (max-width: 768px) {
  h1 {
    font-size: 1.8rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.3rem;
  }

  .container {
    padding: 10px;
  }

  section {
    margin-bottom: 20px;
    padding: 20px;
  }

  .menu-btn {
    display: block;
  }

  .nav-menu {
    display: none;
  }

  .mobile-menu {
    display: none;
    position: static;
    box-shadow: none;
    border-top: 1px solid #f0f0f0;
  }

  .coloring-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
  }

}


footer {
    background-color: var(--text-color);
    color: white;
    padding: 60px 0;
    margin-top: 60px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

@media (min-width: 768px) {
    .footer-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.footer-logo {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}

.footer-logo img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    margin-right: 10px;
}

.footer-logo span {
    font-size: 1.2rem;
    font-weight: bold;
}

.footer-text {
    color: #999;
    font-size: 0.9rem;
}

.footer-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 10px 0 20px 0;
    color: white;
}

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

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

.footer-links a {
    color: #999;
}

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

.footer-bottom {
    border-top: 1px solid #444;
    margin-top: 40px;
    padding-top: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

@media (min-width: 768px) {
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}

.copyright {
    color: #777;
    font-size: 0.8rem;
    margin-bottom: 15px;
}

@media (min-width: 768px) {
    .copyright {
        margin-bottom: 0;
    }
}

.footer-social {
    display: flex;
    gap: 15px;
}

.footer-social a {
    color: #999;
}

.footer-social a:hover {
    color: var(--primary-color);
}

.footer-social img {
    width: 20px;
}