/* ========== Vue Admin Better 风格后台 ==========
   深色可折叠侧边栏 + 白色顶栏 + 浅灰内容区 + 白色卡片
   基于 element-ui 设计语言，保留全部功能
*/

:root {
  --ab-sidebar-bg: #304156;
  --ab-sidebar-bg-2: #263445;
  --ab-sidebar-text: #bfcbd9;
  --ab-sidebar-text-active: #ffffff;
  --ab-sidebar-sub: #1f2d3d;
  --ab-header-bg: #ffffff;
  --ab-content-bg: #f0f2f5;
  --ab-card-bg: #ffffff;
  --ab-primary: #409eff;
  --ab-primary-light: #ecf5ff;
  --ab-text: #303133;
  --ab-text-regular: #606266;
  --ab-text-secondary: #909399;
  --ab-border: #dcdfe6;
  --ab-border-light: #e4e7ed;
  --ab-border-lighter: #ebeef5;
  --ab-shadow: 0 2px 4px 0 rgba(0, 21, 41, 0.08);
}

* { box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 14px;
  color: var(--ab-text);
  background: var(--ab-content-bg);
  -webkit-font-smoothing: antialiased;
}

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

/* ============ 登录页 ============ */
.admin-login {
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #1f2d3d 0%, #304156 50%, #263445 100%);
  padding: 20px;
}
.admin-login-box {
  width: 380px; max-width: 100%;
  background: #fff; border-radius: 8px; padding: 36px 36px 28px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
}
.admin-login-box .login-title {
  font-size: 22px; font-weight: 600; text-align: center; margin-bottom: 8px;
  color: var(--ab-text);
}
.admin-login-box .login-sub {
  font-size: 13px; color: var(--ab-text-secondary); text-align: center;
  margin-bottom: 28px;
}
.admin-login-box input {
  width: 100%; height: 40px; padding: 0 14px; margin-bottom: 16px;
  border: 1px solid var(--ab-border); border-radius: 4px;
  font-size: 14px; color: var(--ab-text); background: #fff;
  outline: none; transition: border-color 0.2s;
}
.admin-login-box input:focus { border-color: var(--ab-primary); }
.admin-login-box button {
  width: 100%; height: 40px; border: none; border-radius: 4px;
  background: var(--ab-primary); color: #fff; font-size: 15px;
  cursor: pointer; transition: opacity 0.2s;
}
.admin-login-box button:hover { opacity: 0.85; }
.admin-error { color: #f56c6c; font-size: 13px; margin-bottom: 12px; text-align: center; min-height: 18px; }

/* ============ 主体布局 ============ */
.admin-layout { display: flex; min-height: 100vh; }

/* ============ 深色侧边栏 ============ */
.admin-sidebar {
  width: 210px; background: var(--ab-sidebar-bg);
  flex-shrink: 0; display: flex; flex-direction: column;
  transition: width 0.28s; overflow: hidden;
  position: fixed; top: 0; left: 0; bottom: 0; z-index: 100;
}
.admin-sidebar.collapsed { width: 64px; }

.sidebar-header {
  height: 60px; display: flex; align-items: center; gap: 10px;
  padding: 0 16px; background: var(--ab-sidebar-sub);
  flex-shrink: 0; overflow: hidden;
}
.sidebar-header .logo-mark {
  width: 32px; height: 32px; border-radius: 6px;
  background: var(--ab-primary); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 16px; flex-shrink: 0;
}
.sidebar-header .logo-text {
  color: #fff; font-size: 16px; font-weight: 600; white-space: nowrap;
}
.admin-sidebar.collapsed .logo-text { display: none; }

.admin-nav { flex: 1; overflow-y: auto; overflow-x: hidden; padding: 12px 0; }
.admin-nav::-webkit-scrollbar { width: 6px; }
.admin-nav::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 3px; }
.admin-nav a {
  display: flex; align-items: center; gap: 10px;
  padding: 0 20px; height: 48px; color: var(--ab-sidebar-text);
  font-size: 14px; white-space: nowrap; cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.admin-nav a:hover { color: var(--ab-sidebar-text-active); background: rgba(255,255,255,0.06); }
.admin-nav a.active {
  color: var(--ab-sidebar-text-active); background: var(--ab-primary);
}
.admin-nav a .nav-icon { width: 20px; text-align: center; font-size: 16px; flex-shrink: 0; }
.admin-nav a .nav-label { overflow: hidden; text-overflow: ellipsis; }
.admin-sidebar.collapsed .nav-label { display: none; }
.admin-sidebar.collapsed .admin-nav a { justify-content: center; padding: 0; }

/* ============ 主内容区 ============ */
.admin-main-wrap {
  flex: 1; margin-left: 210px; display: flex; flex-direction: column;
  min-width: 0; transition: margin-left 0.28s;
}
.admin-sidebar.collapsed ~ .admin-main-wrap { margin-left: 64px; }

/* ============ 顶栏 ============ */
.admin-header {
  height: 60px; background: var(--ab-header-bg);
  box-shadow: 0 1px 4px rgba(0, 21, 41, 0.08);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 20px; position: sticky; top: 0; z-index: 50;
  flex-shrink: 0;
}
.header-left { display: flex; align-items: center; gap: 12px; }
.header-collapse {
  width: 36px; height: 36px; border: none; background: none; cursor: pointer;
  font-size: 20px; color: var(--ab-text-regular); border-radius: 4px;
  display: flex; align-items: center; justify-content: center;
}
.header-collapse:hover { background: var(--ab-border-lighter); color: var(--ab-text); }
.header-breadcrumb { font-size: 15px; font-weight: 600; color: var(--ab-text); }

.header-right { display: flex; align-items: center; gap: 16px; }
.header-user { display: flex; align-items: center; gap: 8px; cursor: pointer; }
.header-user .avatar {
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--ab-primary); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 600;
}
.header-user .user-name { font-size: 14px; color: var(--ab-text-regular); }
.header-user .user-role {
  font-size: 12px; color: var(--ab-primary);
  background: var(--ab-primary-light); padding: 1px 8px; border-radius: 10px;
}
.header-link {
  font-size: 14px; color: var(--ab-text-regular); cursor: pointer;
  padding: 6px 10px; border-radius: 4px; transition: all 0.2s;
}
.header-link:hover { color: var(--ab-primary); background: var(--ab-border-lighter); }

/* ============ 内容区 ============ */
.admin-content {
  flex: 1; padding: 20px; overflow-y: auto;
}
.admin-content::-webkit-scrollbar { width: 8px; }
.admin-content::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.15); border-radius: 4px; }

/* ============ 卡片 ============ */
.ab-card {
  background: var(--ab-card-bg); border-radius: 4px;
  box-shadow: var(--ab-shadow); padding: 20px; margin-bottom: 20px;
}
.ab-card-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 16px;
}
.ab-card-header h2 { font-size: 18px; font-weight: 600; color: var(--ab-text); margin: 0; }

/* ============ 按钮 ============ */
.admin-btn {
  height: 36px; padding: 0 16px; border: 1px solid var(--ab-border);
  border-radius: 4px; background: #fff; color: var(--ab-text);
  font-size: 14px; cursor: pointer; transition: all 0.2s;
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
}
.admin-btn:hover { color: var(--ab-primary); border-color: #c6e2ff; background: var(--ab-primary-light); }
.admin-btn.primary {
  background: var(--ab-primary); border-color: var(--ab-primary); color: #fff;
}
.admin-btn.primary:hover { background: #66b1ff; border-color: #66b1ff; }
.admin-btn.danger { background: #f56c6c; border-color: #f56c6c; color: #fff; }
.admin-btn.danger:hover { background: #f78989; border-color: #f78989; }
.admin-btn.secondary { background: #fff; }
.admin-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ============ 表单 ============ */
.article-form { background: transparent; box-shadow: none; padding: 0; max-width: none; }
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block; font-size: 14px; font-weight: 500;
  color: var(--ab-text-regular); margin-bottom: 8px;
}
.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="number"],
.form-group select,
.form-group textarea {
  width: 100%; height: 36px; padding: 0 12px;
  border: 1px solid var(--ab-border); border-radius: 4px;
  font-size: 14px; color: var(--ab-text); background: #fff;
  outline: none; transition: border-color 0.2s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color: var(--ab-primary);
}
.form-group textarea { height: auto; min-height: 200px; padding: 10px 12px; line-height: 1.7; resize: vertical; }
.form-actions { display: flex; gap: 12px; justify-content: flex-end; margin-top: 24px; }

/* ============ 表格 ============ */
.admin-table-wrapper { background: #fff; border-radius: 4px; box-shadow: var(--ab-shadow); overflow: hidden; }
.admin-table { width: 100%; border-collapse: collapse; }
.admin-table th, .admin-table td {
  padding: 12px 16px; text-align: left; font-size: 14px;
  border-bottom: 1px solid var(--ab-border-lighter); color: var(--ab-text);
}
.admin-table th {
  background: #fafafa; color: var(--ab-text-regular); font-weight: 600;
}
.admin-table tr:last-child td { border-bottom: none; }
.admin-table tbody tr:hover { background: var(--ab-primary-light); }
.admin-table .actions { display: flex; gap: 8px; }
.admin-table .actions button {
  height: 28px; padding: 0 10px; border-radius: 4px; border: none;
  font-size: 12px; cursor: pointer; display: inline-flex; align-items: center; justify-content: center;
}

/* ============ 上传区 ============ */
.upload-area {
  border: 1px dashed var(--ab-border); border-radius: 4px;
  padding: 20px; text-align: center; cursor: pointer;
  transition: border-color 0.2s; margin-top: 4px;
}
.upload-area:hover { border-color: var(--ab-primary); background: var(--ab-primary-light); }
.upload-area .upload-icon { font-size: 32px; margin-bottom: 8px; }
.upload-area .upload-hint { font-size: 13px; color: var(--ab-text-secondary); }
.upload-preview { margin-top: 12px; }
.upload-preview img { max-width: 100%; max-height: 160px; border-radius: 4px; border: 1px solid var(--ab-border-lighter); }

/* ============ 图标选择器 ============ */
.icon-picker {
  display: flex; flex-wrap: wrap; gap: 12px; margin-top: 8px;
  padding: 12px; background: var(--ab-border-lighter); border-radius: 4px;
}
.icon-item {
  position: relative; width: 64px; text-align: center; cursor: pointer;
  padding: 8px 4px 6px; border-radius: 4px;
  border: 2px solid transparent; transition: all 0.15s;
}
.icon-item:hover { background: #fff; }
.icon-item.selected { border-color: var(--ab-primary); background: #fff; }
.icon-item img { width: 40px; height: 40px; border-radius: 4px; display: block; margin: 0 auto 4px; object-fit: contain; }
.icon-item span { font-size: 11px; color: var(--ab-text-secondary); }
.icon-item .icon-del {
  position: absolute; top: 2px; right: 2px; width: 18px; height: 18px;
  border-radius: 50%; border: none; background: #f56c6c; color: #fff;
  font-size: 12px; line-height: 18px; cursor: pointer; display: none; padding: 0;
}
.icon-item:hover .icon-del { display: block; }

/* ============ 导航编辑器 ============ */
.nav-editor-list { display: flex; flex-direction: column; gap: 8px; margin-top: 8px; }
.nav-edit-row {
  display: flex; gap: 8px; align-items: center;
  padding: 8px; background: var(--ab-border-lighter); border-radius: 4px;
}
.nav-edit-row input[type="text"] {
  padding: 6px 10px; border: 1px solid var(--ab-border); border-radius: 4px;
  font-size: 13px; background: #fff;
}
.nav-edit-tab { display: flex; gap: 4px; align-items: center; font-size: 12px; color: var(--ab-text-regular); white-space: nowrap; }
.nav-edit-tab input { width: auto; }
.nav-edit-btns { display: flex; gap: 4px; }
.nav-edit-btns button {
  width: 26px; height: 26px; border: 1px solid var(--ab-border); border-radius: 4px;
  background: #fff; color: var(--ab-text-regular); cursor: pointer; font-size: 14px; padding: 0;
}
.nav-edit-btns button:hover:not(:disabled) { color: var(--ab-primary); border-color: #c6e2ff; }
.nav-edit-btns button:disabled { opacity: 0.4; cursor: not-allowed; }
.nav-edit-btns button.del:hover { color: #f56c6c; border-color: #fbc4c4; }

/* ============ 空状态 ============ */
.loading, .loading-block { text-align: center; color: var(--ab-text-secondary); padding: 40px; }

/* ============ 手机端 ============ */
@media (max-width: 768px) {
  .admin-sidebar { width: 240px; }
  .admin-sidebar.collapsed { width: 64px; }
  .admin-main-wrap { margin-left: 0; }
  .admin-sidebar.collapsed ~ .admin-main-wrap { margin-left: 0; }
  .admin-sidebar { transform: translateX(-100%); }
  .admin-sidebar.open { transform: translateX(0); }
  .admin-sidebar:not(.open) ~ .admin-main-wrap { margin-left: 0; }
  .sidebar-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.45); z-index: 99; }
  .sidebar-overlay.active { display: block; }
  .admin-content { padding: 12px; }
  .header-breadcrumb { font-size: 14px; }
  .header-user .user-name { display: none; }
}