/* 清欢素材网 - 通用样式文件 */

/* CSS 变量定义 */
:root {
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --accent: #2563eb;
  --accent-light: #3b82f6;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --radius: 18px;
  --shadow: 0 24px 60px rgba(15, 23, 42, 0.08);
  --shadow-hover: 0 32px 80px rgba(15, 23, 42, 0.12);
}

/* 基础样式重置 */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  background: radial-gradient(circle at 20% 20%, rgba(37, 99, 235, 0.08), transparent 30%),
              radial-gradient(circle at 80% 0%, rgba(14, 165, 233, 0.12), transparent 32%),
              var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* 导航栏样式 */
header {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: 20px;
  color: var(--accent);
  text-decoration: none;
}

nav {
  display: flex;
  gap: 18px;
  color: var(--muted);
  font-weight: 500;
}

nav a {
  color: inherit;
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 10px;
  transition: all 0.2s ease;
}

nav a:hover, nav a.active {
  background: rgba(37, 99, 235, 0.08);
  color: var(--text);
}

.auth-btn {
  background: linear-gradient(120deg, var(--accent), var(--accent-light));
  color: #fff;
  border: none;
  border-radius: 12px;
  padding: 10px 18px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.25);
  text-decoration: none;
  display: inline-block;
}

.auth-btn:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.user-menu {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: transform 0.2s;
  text-decoration: none;
}

.user-avatar:hover {
  transform: scale(1.05);
}

.logout-btn {
  background: rgba(239, 68, 68, 0.1);
  color: var(--error);
  border: 1px solid rgba(239, 68, 68, 0.2);
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.logout-btn:hover {
  background: rgba(239, 68, 68, 0.2);
}

/* 按钮通用样式 */
.btn {
  border: none;
  border-radius: 12px;
  padding: 14px 18px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn-primary {
  background: linear-gradient(120deg, var(--accent), var(--accent-light));
  color: #fff;
  box-shadow: 0 15px 30px rgba(37, 99, 235, 0.25);
}

.btn-ghost {
  background: rgba(15, 23, 42, 0.04);
  color: var(--text);
  border: 1px solid rgba(15, 23, 42, 0.08);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* 卡片样式 */
.panel, .material-card, .category-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(15, 23, 42, 0.04);
  transition: transform 0.2s, box-shadow 0.2s;
}

.material-card, .category-card, .popular-card {
  text-decoration: none;
  color: inherit;
}

.material-card:hover, .category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.panel h3 {
  margin: 0 0 12px;
}

.panel p {
  margin: 0 0 16px;
  color: var(--muted);
}

/* 表单样式 */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--text);
}

.form-input {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 12px;
  font-size: 16px;
  transition: border-color 0.2s, box-shadow 0.2s;
  background: #fff;
}

.form-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-input.error {
  border-color: var(--error);
}

.error-message {
  color: var(--error);
  font-size: 14px;
  margin-top: 4px;
  display: none;
}

.checkbox-group {
  display: flex;
  align-items: center;
  margin-bottom: 24px;
}

.checkbox-input {
  width: 18px;
  height: 18px;
  margin-right: 8px;
  accent-color: var(--accent);
}

.checkbox-label {
  font-size: 14px;
  color: var(--muted);
  cursor: pointer;
}

.link {
  color: var(--accent);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
}

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

/* 页面标题样式 */
.page-hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px 80px;
  text-align: center;
}

.page-title {
  font-size: clamp(36px, 5vw, 52px);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 18px;
}

.page-desc {
  color: var(--muted);
  max-width: 600px;
  margin: 0 auto 40px;
  font-size: 18px;
}

/* 网格布局 */
.materials-grid, .categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.categories-grid {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  margin-top: 0;
  padding: 0 24px 80px;
  max-width: 1200px;
  margin: 0 auto;
}

/* 素材卡片样式 */
.material-icon, .category-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(14, 165, 233, 0.1));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 16px;
}

.category-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  font-size: 32px;
  margin: 0 auto 20px;
}

.material-title, .category-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.category-title {
  font-size: 24px;
  margin-bottom: 12px;
}

.material-desc, .category-desc {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
  margin-bottom: 20px;
}

.category-desc {
  font-size: 16px;
  margin-bottom: 20px;
}

.material-stats, .category-stats {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--muted);
}

.category-stats {
  justify-content: center;
  gap: 16px;
  font-size: 14px;
}


/* 登录页面特有样式 */
.login-container {
  max-width: 400px;
  width: 100%;
  background: var(--card);
  border-radius: var(--radius);
  padding: 40px 32px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(15, 23, 42, 0.04);
}

.login-title {
  font-size: 28px;
  font-weight: 600;
  text-align: center;
  margin-bottom: 8px;
}

.login-subtitle {
  color: var(--muted);
  text-align: center;
  margin-bottom: 32px;
  font-size: 16px;
}

.login-btn {
  width: 100%;
  background: linear-gradient(120deg, var(--accent), var(--accent-light));
  color: #fff;
  border: none;
  border-radius: 12px;
  padding: 16px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.25);
  margin-bottom: 24px;
}

.login-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 24px rgba(37, 99, 235, 0.3);
}

.login-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.links {
  text-align: center;
}

.back-link {
  position: absolute;
  top: 24px;
  left: 24px;
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
}

.back-link:hover {
  color: var(--text);
}

/* 验证码输入框样式 */
.code-input-group {
  display: flex;
  gap: 12px;
  align-items: stretch;
}

.code-btn {
  background: rgba(37, 99, 235, 0.1);
  color: var(--accent);
  border: 1px solid rgba(37, 99, 235, 0.2);
  border-radius: 8px;
  padding: 0 16px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.code-btn:hover:not(:disabled) {
  background: var(--accent);
  color: white;
}

.code-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.code-tip {
  color: var(--success);
  font-size: 14px;
  margin-top: 4px;
  display: none;
}

/* 页脚样式 */
footer {
  max-width: 1200px;
  margin: 0 auto;
  padding: 28px 24px 48px;
  color: var(--muted);
  text-align: center;
}



/* 移动端菜单按钮样式 */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 30px;
  height: 24px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  margin-left: auto;
}

.mobile-menu-btn span {
  width: 100%;
  height: 3px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s ease;
  transform-origin: center;
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

/* 移动端导航菜单 */
.mobile-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(10px);
  z-index: 1000;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 32px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  display: none; /* 在移动端媒体查询中会改为flex */
}

.mobile-nav.active {
  opacity: 1;
  visibility: visible;
  display: flex;
}

.mobile-nav a,
.mobile-nav .logout-btn {
  color: white;
  text-decoration: none;
  font-size: 18px;
  font-weight: 500;
  padding: 12px 24px;
  border-radius: 12px;
  transition: all 0.2s ease;
  display: block;
  text-align: center;
  min-width: 160px;
}

.mobile-nav a:hover,
.mobile-nav a.active,
.mobile-nav .logout-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

/* 移动端菜单打开时的body样式 */
.mobile-menu-open {
  overflow: hidden;
}

/* 响应式设计 */
@media (max-width: 768px) {
  /* 隐藏桌面端导航，显示移动端菜单按钮 */
  .desktop-nav {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  /* 显示移动端导航菜单 */
  .mobile-nav {
    display: flex;
  }

  /* 桌面端用户菜单在移动端隐藏 */
  .desktop-user-menu,
  .desktop-auth-btn {
    display: none;
  }

  /* 调整头部布局 */
  header {
    padding: 20px 16px;
    position: relative;
  }

  .brand {
    font-size: 18px;
  }

  /* 页面标题样式调整 */
  .page-hero {
    padding: 32px 16px 48px;
  }

  .page-title {
    font-size: clamp(32px, 8vw, 48px);
  }

  .page-desc {
    font-size: 16px;
  }

  /* 网格布局调整 */
  .materials-grid {
    grid-template-columns: 1fr;
    padding: 0 16px 60px;
    gap: 16px;
  }

  .categories-grid {
    grid-template-columns: 1fr;
    padding: 0 16px 60px;
    gap: 16px;
  }

  .category-card {
    padding: 20px 16px;
  }

  /* 按钮调整 */
  .btn {
    width: 100%;
    padding: 16px 20px;
    font-size: 16px;
  }

  /* 卡片样式调整 */
  .panel,
  .material-card,
  .category-card {
    padding: 20px 16px;
  }

  /* 表单样式调整 */
  .form-group {
    margin-bottom: 16px;
  }

  .form-input {
    padding: 16px 18px;
    font-size: 16px;
  }

  /* 页脚调整 */
  footer {
    padding: 32px 16px 40px;
    font-size: 14px;
  }
}

@media (max-width: 480px) {
  /* 更小的屏幕优化 */
  header {
    padding: 16px 12px;
  }

  .brand {
    font-size: 16px;
  }

  .page-hero {
    padding: 24px 12px 32px;
  }

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

  .page-desc {
    font-size: 15px;
  }

  /* 网格布局进一步调整 */
  .materials-grid,
  .categories-grid {
    padding: 0 12px 40px;
    gap: 12px;
  }

  .panel,
  .material-card,
  .category-card {
    padding: 16px 12px;
    border-radius: 16px;
  }

  /* 登录页面特殊处理 */
  .login-container {
    padding: 32px 20px;
    margin: 16px;
    border-radius: 20px;
  }

  body {
    padding: 0;
  }

  /* 按钮进一步调整 */
  .btn {
    padding: 14px 18px;
  }

  .auth-btn {
    padding: 12px 20px;
    font-size: 15px;
  }
}