:root {
  --admin-main: #2563eb;
  --admin-main-light: #60a5fa;
  --sidebar-bg: #0f172a;
  --sidebar-text: #94a3b8;
  --sidebar-active: #fff;
  --page-bg: #f1f5f9;
  --card-bg: #ffffff;
  --text-dark: #1e293b;
  --text-gray: #64748b;
  --border: #e2e8f0;
  --shadow-card: 0 2px 16px rgba(0,0,0,0.05);
  --radius: 12px;
  --transition: 0.24s ease;
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Microsoft YaHei", system-ui, sans-serif;
}
body.admin-body {
  background: var(--page-bg);
  display: flex;
  min-height: 100vh;
}

/* 侧边栏 */
.admin-nav-wrap {
  width: 260px;
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  flex-shrink: 0;
  padding: 36px 0;
  display: flex;
  flex-direction: column;
}
.admin-nav-user {
  padding: 0 28px 28px;
  border-bottom: 1px solid #334155;
  margin-bottom: 24px;
}
.admin-nav-user span {
  font-size: 15px;
  opacity: 0.9;
}
.admin-nav-list a {
  display: block;
  color: var(--sidebar-text);
  padding: 14px 28px;
  font-size: 15px;
  transition: var(--transition);
  position: relative;
}
.admin-nav-list a:hover {
  background: #1e293b;
  color: var(--sidebar-active);
}
.admin-nav-list a:hover::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: 100%;
  background: var(--admin-main);
}
.admin-nav-list a:last-child {
  color: #fb7185;
  margin-top: 20px;
}

/* 主内容区域 */
.admin-main-wrap {
  flex: 1;
  padding: 36px;
}
.admin-main {
  background: var(--card-bg);
  padding: 36px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}
.admin-main h2 {
  font-size: 24px;
  color: var(--text-dark);
  margin-bottom: 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* 仪表盘统计卡片渐变 */
.stat-box {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px,1fr));
  gap: 22px;
  margin-bottom: 32px;
}
.stat-item {
  padding: 28px;
  border-radius: var(--radius);
  color: white;
  font-size: 18px;
  background: linear-gradient(135deg, #2563eb, #3b82f6);
  box-shadow: 0 6px 20px rgba(37,99,235,0.2);
}

/* 表单美化 */
.form-item {
  margin-bottom: 24px;
}
.form-item label {
  display: block;
  margin-bottom: 9px;
  font-weight: 500;
  color: var(--text-dark);
  font-size: 15px;
}
.form-item input,
.form-item select,
.form-item textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 15px;
  transition: var(--transition);
  background: #f8fafc;
}
.form-item input:focus,
.form-item select:focus,
.form-item textarea:focus {
  outline: none;
  border-color: var(--admin-main);
  background: #fff;
}
.form-item p {
  margin-top: 8px;
  font-size: 13px;
  color: var(--text-gray);
}

/* 按钮统一风格 */
.btn {
  padding: 12px 26px;
  background: var(--admin-main);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 15px;
  cursor: pointer;
  transition: var(--transition);
}
.btn:hover {
  background: #1d4ed8;
  box-shadow: 0 4px 12px rgba(37,99,235,0.18);
}
.quick-link {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 24px;
}

/* 数据表格 */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 24px;
}
.data-table th,
.data-table td {
  padding: 15px 18px;
  border: 1px solid var(--border);
  font-size: 14px;
}
.data-table th {
  background: #f8fafc;
  color: var(--text-dark);
  font-weight: 500;
}
.data-table tr:hover td {
  background: #f8fafc;
}
.data-table a {
  color: var(--admin-main);
  margin: 0 8px;
}
.data-table a:last-of-type {
  color: #ef4444;
}

/* 新增分类表单 */
.add-form {
  display: flex;
  gap: 14px;
  margin-bottom: 26px;
}
.add-form input {
  flex: 1;
  padding: 13px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #f8fafc;
}

/* 登录页面 */
.login-body {
  background: var(--page-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
}
.login-box {
  width: 440px;
  background: white;
  padding: 46px;
  border-radius: 16px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.07);
}
.login-box h2 {
  text-align: center;
  margin-bottom: 36px;
  font-size: 26px;
  color: var(--text-dark);
}
.login-box input {
  width: 100%;
  margin-bottom: 18px;
  padding: 15px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #f8fafc;
  font-size: 15px;
}
.login-box .btn {
  width: 100%;
  padding: 15px;
  font-size: 16px;
}
.error {
  color: #ef4444;
  text-align: center;
  margin-bottom: 16px;
  padding: 10px;
  background: #fef2f2;
  border-radius: var(--radius);
}

/* 修改密码页面提示框 */
.tip-ok {
  color: #059669;
  background: #ecfdf5;
  padding: 12px 16px;
  border-radius: var(--radius);
  margin-bottom: 22px;
}
.tip-err {
  color: #ef4444;
  background: #fef2f2;
  padding: 12px 16px;
  border-radius: var(--radius);
  margin-bottom: 22px;
}