/* ============================================================
 * 企业建站 CMS 后台样式 (admin/assets/admin.css)
 * 现代 SaaS 卡片式 · 浅色背景 + 深色侧边栏 · 响应式
 * ============================================================ */

:root{
  --p:#6366f1; --p2:#8b5cf6; --p-soft:rgba(99,102,241,.1);
  --bg:#f4f6fb; --panel:#fff; --border:#e9edf4;
  --text:#1e293b; --text-muted:#64748b; --text-light:#94a3b8;
  --sidebar-bg:#1e1b3a; --sidebar-hover:rgba(255,255,255,.08);
  --radius:14px; --radius-sm:10px;
  --shadow:0 4px 20px rgba(15,23,42,.06);
  --shadow-lg:0 12px 32px rgba(15,23,42,.1);
  --success:#10b981; --warning:#f59e0b; --danger:#ef4444; --info:#3b82f6;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font-family:"Segoe UI",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;font-size:14px;line-height:1.6}
a{text-decoration:none;color:inherit}
code{background:#f1f5f9;padding:2px 6px;border-radius:4px;font-size:12px;color:#475569}

/* 布局 */
.app-layout{display:flex;min-height:100vh}
.app-sidebar{position:fixed;top:0;left:0;width:240px;height:100vh;background:linear-gradient(180deg,#1e1b3a 0%,#22194d 100%);color:#c7d2fe;display:flex;flex-direction:column;z-index:1040;transition:transform .3s}
.app-main{flex:1;margin-left:240px;min-width:0;display:flex;flex-direction:column;min-height:100vh}
@media(max-width:991px){.app-sidebar{transform:translateX(-100%)}.app-main{margin-left:0}.app-sidebar.show{transform:translateX(0)}}

/* 侧边栏品牌 */
.sidebar-brand{display:flex;align-items:center;gap:12px;padding:20px 18px;border-bottom:1px solid rgba(255,255,255,.08)}
.brand-logo{width:42px;height:42px;border-radius:12px;background:linear-gradient(135deg,var(--p),var(--p2));display:flex;align-items:center;justify-content:center;color:#fff;font-size:20px;box-shadow:0 6px 18px rgba(99,102,241,.5)}
.brand-name{color:#fff;font-weight:700;font-size:15px;line-height:1.2;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:150px}
.brand-sub{color:#94a3b8;font-size:11px}

/* 侧边栏导航 */
.sidebar-nav{flex:1;overflow-y:auto;padding:12px 10px}
.sidebar-nav .nav-link{display:flex;align-items:center;gap:12px;padding:11px 14px;color:#c7d2fe;border-radius:var(--radius-sm);font-weight:500;transition:all .18s;margin-bottom:2px}
.sidebar-nav .nav-link i{font-size:17px;width:22px;text-align:center}
.sidebar-nav .nav-link:hover{background:var(--sidebar-hover);color:#fff}
.sidebar-nav .nav-link.active{background:linear-gradient(135deg,var(--p),var(--p2));color:#fff;box-shadow:0 4px 14px rgba(99,102,241,.45)}

/* 侧边栏分组折叠 */
.nav-group{margin-top:6px}
.nav-group-header{display:flex;align-items:center;gap:10px;padding:8px 14px;color:#818cf8;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.03em;cursor:pointer;user-select:none;border-radius:var(--radius-sm);transition:color .15s}
.nav-group-header:hover{color:#a5b4fc}
.nav-group-header i:first-child{font-size:15px;width:20px;text-align:center}
.nav-group-arrow{margin-left:auto;font-size:12px;transition:transform .25s ease}
.nav-group-header.collapsed .nav-group-arrow{transform:rotate(-90deg)}
.nav-group-items{overflow:hidden;max-height:600px;transition:max-height .28s ease}
.nav-group-items.collapsed{max-height:0}
.nav-group-items .nav-link{padding-left:20px;font-size:13px}
.nav-wip-badge{margin-left:auto;background:#f97316;color:#fff;font-size:9px;padding:2px 7px;border-radius:8px;font-weight:600;white-space:nowrap;line-height:1.4;text-transform:none;letter-spacing:0}
.sidebar-footer{padding:14px;border-top:1px solid rgba(255,255,255,.08);display:flex;flex-direction:column;gap:8px}
.developer-credit{text-align:center;padding-top:6px}
.developer-credit .dev-link{font-size:12px;color:#6b7280;opacity:.7;transition:opacity .2s}
.developer-credit .dev-link:hover{opacity:1;color:#a5b4fc}

/* 顶栏 */
.app-topbar{background:var(--panel);height:64px;display:flex;align-items:center;justify-content:space-between;padding:0 24px;box-shadow:var(--shadow);position:sticky;top:0;z-index:1030}
.topbar-left{display:flex;align-items:center;gap:12px}
.topbar-title{font-size:17px;font-weight:700;color:var(--text)}
.topbar-right .avatar{width:36px;height:36px;border-radius:10px;background:linear-gradient(135deg,var(--p),var(--p2));color:#fff;display:inline-flex;align-items:center;justify-content:center;font-weight:700;margin-right:8px}
.user-name{color:var(--text);font-weight:600}

/* 主内容 */
.app-content{padding:24px;flex:1}

/* 页面工具条 */
.page-toolbar h4{font-size:18px}

/* 卡片面板 */
.card-panel{background:var(--panel);border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--border);margin-bottom:16px;overflow:hidden}
.panel-head{padding:16px 20px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;background:#fafbfd}
.panel-title{margin:0;font-size:14px;font-weight:700;display:flex;align-items:center;color:var(--text)}
.panel-body{padding:20px}

/* 统计卡片 */
.stat-card{background:var(--panel);border-radius:var(--radius);padding:20px;display:flex;align-items:center;gap:16px;box-shadow:var(--shadow);border:1px solid var(--border);position:relative;overflow:hidden;transition:transform .2s}
.stat-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.stat-icon{width:54px;height:54px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:24px;color:#fff;flex-shrink:0}
.stat-primary .stat-icon{background:linear-gradient(135deg,#6366f1,#818cf8)}
.stat-success .stat-icon{background:linear-gradient(135deg,#10b981,#34d399)}
.stat-warning .stat-icon{background:linear-gradient(135deg,#f59e0b,#fbbf24)}
.stat-info .stat-icon{background:linear-gradient(135deg,#3b82f6,#60a5fa)}
.stat-value{font-size:26px;font-weight:800;line-height:1.1}
.stat-label{color:var(--text-muted);font-size:13px}

/* 表格 */
.table{margin:0}
.table thead th{font-size:12px;text-transform:uppercase;letter-spacing:.4px;color:var(--text-light);font-weight:700;border-bottom:2px solid var(--border);background:transparent}
.table td{border-bottom:1px solid #f1f5f9;vertical-align:middle}
.thumb{width:54px;height:54px;border-radius:8px;object-fit:cover;border:1px solid var(--border)}
.thumb-sm{width:40px;height:40px}
.thumb-empty{display:flex;align-items:center;justify-content:center;background:#f8fafc;color:var(--text-light);font-size:18px}

/* 按钮软样式 */
.btn-ghost{background:transparent;border:1px solid transparent;color:var(--text-muted);padding:.25rem .5rem;border-radius:8px}
.btn-ghost:hover{background:var(--p-soft);color:var(--p)}
.btn-light{background:#f1f5f9;border:1px solid var(--border)}
.bg-success-soft{background:rgba(16,185,129,.13);color:#059669}
.bg-secondary-soft{background:rgba(100,116,139,.13);color:#475569}
.bg-primary-soft{background:var(--p-soft);color:var(--p)}
.bg-info-soft{background:rgba(59,130,246,.13);color:#2563eb}
.btn-primary{background:linear-gradient(135deg,var(--p),var(--p2));border:none}
.btn-primary:hover{filter:brightness(1.08)}
.form-control,.form-select,.form-control-lg{border-radius:var(--radius-sm)}
.form-control:focus,.form-select:focus{border-color:var(--p);box-shadow:0 0 0 .2rem rgba(99,102,241,.12)}

/* 排序箭头 */
.sort-arrows{display:inline-flex;flex-direction:column;line-height:1}
.sort-arrows .sort-btn{font-size:11px;padding:0 2px}

/* 上传/图集 */
.upload-box{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;border:2px dashed var(--border);border-radius:var(--radius-sm);padding:22px;color:var(--text-muted);cursor:pointer;transition:all .2s;background:#fafbfd}
.upload-box:hover{border-color:var(--p);color:var(--p);background:var(--p-soft)}
.upload-box i{font-size:24px}
.upload-sm{padding:12px}
.image-gallery{display:flex;flex-wrap:wrap;gap:10px}
.gallery-item{position:relative;width:90px;height:90px;border-radius:8px;overflow:hidden;border:1px solid var(--border)}
.gallery-item img{width:100%;height:100%;object-fit:cover}
.gallery-item .rm{position:absolute;top:2px;right:2px;width:20px;height:20px;border-radius:50%;background:rgba(0,0,0,.6);color:#fff;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:12px;border:none}
.gallery-item .rm:hover{background:var(--danger)}
.cover-preview{width:100%;height:160px;border-radius:var(--radius-sm);background:#f8fafc;border:1px solid var(--border);display:flex;align-items:center;justify-content:center;overflow:hidden}
.cover-preview img{width:100%;height:100%;object-fit:cover}
.cover-preview:empty::before{content:"无封面";color:var(--text-light)}

/* 主题卡片 */
.theme-card{border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:#fff;transition:all .2s}
.theme-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px)}
.theme-active{border:2px solid var(--p);box-shadow:0 0 0 4px var(--p-soft)}
.theme-thumb{position:relative;height:180px;background:#f1f5f9;overflow:hidden}
.theme-thumb img{width:100%;height:100%;object-fit:cover}
.theme-thumb-empty{height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--text-light);gap:6px}
.theme-badge{position:absolute;top:10px;right:10px;background:var(--p);color:#fff;padding:4px 12px;border-radius:20px;font-size:12px;font-weight:600}
.theme-body{padding:18px}

/* 版本/更新 */
.version-box{background:#f8fafc;border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px}
.version-num{font-size:24px;font-weight:800;color:var(--text)}
.changelog{background:#f8fafc;border-radius:var(--radius-sm);padding:14px;max-height:220px;overflow-y:auto;font-size:13px;color:var(--text-muted)}
.safe-list p{font-size:13px}

/* 登录页 */
.login-page{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}
.login-wrapper{width:100%;max-width:420px}
.login-card{background:#fff;border-radius:18px;padding:36px;box-shadow:0 25px 60px rgba(0,0,0,.25)}
.login-brand{text-align:center;margin-bottom:24px}
.login-brand .brand-logo{width:60px;height:60px;font-size:28px;margin:0 auto}
.login-footer a{color:var(--text-muted)}
.login-card .form-control,.login-card .input-group-text{border-radius:10px}
.login-card .input-group-text{background:#f8fafc;border-right:none}
.login-card .form-control:focus{box-shadow:none;border-color:var(--p)}

/* Toast */
.toast{min-width:280px;border-radius:var(--radius-sm);border:none;box-shadow:var(--shadow-lg)}
.toast-body{display:flex;align-items:center;gap:10px;padding:14px 18px}
.toast-success .toast-body{background:#fff;color:#059669}
.toast-danger .toast-body{background:#fff;color:#dc2626}
.toast-warning .toast-body{background:#fff;color:#d97706}
.toast-info .toast-body{background:#fff;color:#2563eb}

/* 工具类 */
.text-muted{color:var(--text-muted)!important}
.small{font-size:13px}
.cursor-pointer{cursor:pointer}
.mt-1{margin-top:6px}.mb-3{margin-bottom:1rem!important}
.fade{opacity:0}
.fade.show{opacity:1}

/* 滚动条 */
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:4px}
::-webkit-scrollbar-thumb:hover{background:#94a3b8}