/* ===== 后台管理样式 ===== */
*{margin:0;padding:0;box-sizing:border-box}
:root{
  --primary:#3b6fd6;--primary-dark:#2856a8;--primary-light:#e8f0fc;
  --bg:#f0f2f5;--surface:#fff;--border:#e5e8ec;--border-light:#eef0f3;
  --text:#1a2233;--text-2:#5a6478;--text-3:#9098a8;
  --radius:12px;--radius-sm:8px;
  --shadow:0 1px 3px rgba(20,30,60,.06);--shadow-md:0 4px 16px rgba(20,30,60,.08);
  --green:#1e6e46;--orange:#d9730d;--red:#d03050;
}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;background:var(--bg);color:var(--text);line-height:1.6}

/* ===== 登录界面 ===== */
.login-view{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#1a2744 0%,#2d4373 60%,#3b5a99 100%)}
.login-card{background:var(--surface);border-radius:20px;padding:48px 40px;width:400px;max-width:90vw;text-align:center;box-shadow:0 20px 60px rgba(0,0,0,.3)}
.login-icon{color:var(--primary);margin-bottom:16px;display:flex;justify-content:center}
.login-card h1{font-size:22px;font-weight:700;margin-bottom:4px}
.login-sub{font-size:13px;color:var(--text-3);margin-bottom:28px}
.login-input{width:100%;padding:12px 16px;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:15px;outline:none;transition:border-color .2s,box-shadow .2s;margin-bottom:16px}
.login-input:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}
.login-btn{width:100%;padding:12px;border:none;border-radius:var(--radius-sm);background:var(--primary);color:#fff;font-size:15px;font-weight:600;cursor:pointer;transition:background .15s}
.login-btn:hover{background:var(--primary-dark)}
.login-hint{font-size:13px;color:var(--red);margin-top:12px;min-height:20px}
.back-home{display:inline-block;margin-top:20px;font-size:13px;color:var(--text-3);text-decoration:none}
.back-home:hover{color:var(--primary)}
.login-diagnostic{margin-top:16px;padding:12px;background:var(--bg);border-radius:var(--radius-sm);text-align:left}
.login-diagnostic .diag-line{font-size:11px;color:var(--text-3);font-family:monospace;line-height:1.8;word-break:break-all}
.login-diagnostic .diag-warn{font-size:12px;color:var(--orange);margin-top:8px;padding-top:8px;border-top:1px dashed var(--border)}
.login-diagnostic .diag-warn a{color:var(--primary);text-decoration:underline}

/* ===== 顶部导航 ===== */
.admin-header{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;box-shadow:var(--shadow)}
.admin-header-inner{max-width:1280px;margin:0 auto;padding:0 32px;height:56px;display:flex;align-items:center;justify-content:space-between}
.admin-logo{display:flex;align-items:center;gap:10px;color:var(--primary);font-size:15px;font-weight:600}
.admin-header-actions{display:flex;align-items:center;gap:12px}
.header-link{font-size:13px;color:var(--text-2);text-decoration:none;padding:6px 12px;border-radius:6px;cursor:pointer;border:none;background:none;transition:background .15s}
.header-link:hover{background:var(--bg)}
.logout-btn{color:var(--red)}

/* ===== Tab 导航 ===== */
.tab-nav{max-width:1280px;margin:0 auto;padding:16px 32px 0;display:flex;gap:4px;border-bottom:1px solid var(--border)}
.tab-btn{padding:10px 20px;border:none;background:none;font-size:14px;font-weight:500;color:var(--text-2);cursor:pointer;border-bottom:2px solid transparent;transition:all .15s}
.tab-btn:hover{color:var(--primary)}
.tab-btn.active{color:var(--primary);border-bottom-color:var(--primary)}

/* ===== 面板 ===== */
.tab-panel{max-width:1280px;margin:0 auto;padding:24px 32px;display:none}
.tab-panel.active{display:block}

/* ===== 统计卡片 ===== */
.stats-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px;margin-bottom:24px}
.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;transition:box-shadow .2s}
.stat-card:hover{box-shadow:var(--shadow-md)}
.stat-card .stat-icon{width:40px;height:40px;border-radius:10px;display:flex;align-items:center;justify-content:center;margin-bottom:12px;font-size:20px}
.stat-card .stat-value{font-size:28px;font-weight:700;line-height:1.2}
.stat-card .stat-label{font-size:13px;color:var(--text-3);margin-top:4px}
.stat-card .stat-trend{font-size:12px;margin-top:8px}
.stat-card .stat-trend.up{color:var(--green)}
.stat-card .stat-trend.down{color:var(--red)}

/* 图标背景色 */
.stat-icon.blue{background:#e8f0fc;color:#3b6fd6}
.stat-icon.green{background:#e1f5ee;color:#1e6e46}
.stat-icon.orange{background:#fdf0e6;color:#d9730d}
.stat-icon.purple{background:#eeedfe;color:#7f77dd}
.stat-icon.cyan{background:#e0f4f5;color:#378a9a}
.stat-icon.pink{background:#fce8ef;color:#d03050}

/* ===== 图表区域 ===== */
.chart-section{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin-bottom:16px}
.chart-title{font-size:16px;font-weight:600;margin-bottom:16px}
.chart-container{display:flex;align-items:flex-end;gap:12px;height:200px;padding:0 8px}
.bar-group{flex:1;display:flex;flex-direction:column;align-items:center;gap:6px;height:100%;justify-content:flex-end}
.bar-stack{width:100%;max-width:48px;display:flex;flex-direction:column-reverse;gap:2px;border-radius:4px 4px 0 0;overflow:hidden}
.bar-segment{width:100%;transition:height .3s;border-radius:2px}
.bar-segment.page{background:#3b6fd6}
.bar-segment.resource{background:#1e6e46}
.bar-segment.chapter{background:#d9730d}
.bar-segment.search{background:#7f77dd}
.bar-label{font-size:11px;color:var(--text-3)}
.bar-total{font-size:11px;font-weight:600;color:var(--text)}

/* 双面板 */
.dual-panel{display:grid;grid-template-columns:1fr 1fr;gap:16px}

/* ===== 今日数据 ===== */
.today-stats{display:flex;flex-direction:column;gap:12px}
.today-row{display:flex;justify-content:space-between;align-items:center;padding:8px 0;border-bottom:1px solid var(--border-light)}
.today-row:last-child{border-bottom:none}
.today-row .label{font-size:13px;color:var(--text-2)}
.today-row .value{font-size:18px;font-weight:700}

/* ===== 章节分布 ===== */
.chapter-bar-item{margin-bottom:12px}
.chapter-bar-item:last-child{margin-bottom:0}
.chapter-bar-head{display:flex;justify-content:space-between;font-size:13px;margin-bottom:4px}
.chapter-bar-head .name{color:var(--text-2)}
.chapter-bar-head .count{font-weight:600}
.chapter-bar-track{height:8px;background:var(--bg);border-radius:4px;overflow:hidden}
.chapter-bar-fill{height:100%;background:var(--primary);border-radius:4px;transition:width .4s}

/* ===== 表格 ===== */
.table-wrap{overflow-x:auto}
.data-table{width:100%;border-collapse:collapse;font-size:13px}
.data-table th{text-align:left;padding:10px 12px;background:var(--bg);color:var(--text-2);font-weight:600;white-space:nowrap;border-bottom:1px solid var(--border)}
.data-table td{padding:10px 12px;border-bottom:1px solid var(--border-light);color:var(--text)}
.data-table tr:hover{background:var(--bg)}
.rank-badge{display:inline-flex;align-items:center;justify-content:center;width:24px;height:24px;border-radius:50%;font-size:12px;font-weight:700}
.rank-badge.gold{background:#fef3c7;color:#92400e}
.rank-badge.silver{background:#e5e7eb;color:#4b5563}
.rank-badge.bronze{background:#fed7aa;color:#9a3412}
.rank-badge.normal{background:var(--bg);color:var(--text-3)}
.type-tag{display:inline-block;padding:2px 8px;border-radius:4px;font-size:11px;font-weight:600}
.type-tag.embed{background:#fce8ef;color:#d03050}
.type-tag.video{background:#e8f0fc;color:#2856a8}
.type-tag.image{background:#e1f5ee;color:#1e6e46}

/* ===== 资源管理 ===== */
.section-head-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}
.section-head-row .chart-title{margin-bottom:0}
.action-btn{padding:8px 16px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);font-size:13px;cursor:pointer;color:var(--text-2);transition:all .15s}
.action-btn:hover{border-color:var(--primary);color:var(--primary)}
.action-btn.primary{background:var(--primary);color:#fff;border-color:var(--primary)}
.action-btn.primary:hover{background:var(--primary-dark)}
.action-btn.danger{color:var(--red);border-color:var(--red)}
.action-btn.danger:hover{background:#fce8ef}
.action-btn:disabled{opacity:.5;cursor:not-allowed}

/* ===== 新增内容表单 ===== */
.type-selector{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.type-card{border:2px solid var(--border);border-radius:var(--radius);padding:20px 16px;text-align:center;cursor:pointer;transition:all .2s;background:var(--surface)}
.type-card:hover{border-color:var(--primary);box-shadow:var(--shadow-md)}
.type-card.active{border-color:var(--primary);background:var(--primary-light)}
.type-card-icon{font-size:32px;margin-bottom:8px}
.type-card-icon.bilibili{color:#fb7299}
.type-card-icon.video{color:var(--primary)}
.type-card-icon.image{color:var(--green)}
.type-card-name{font-size:14px;font-weight:600;margin-bottom:4px}
.type-card-desc{font-size:12px;color:var(--text-3);line-height:1.4}

.add-form{display:flex;flex-direction:column;gap:16px}
.form-section{display:flex;flex-direction:column;gap:16px}
.form-group{display:flex;flex-direction:column;gap:6px}
.form-label{font-size:13px;font-weight:600;color:var(--text-2)}
.form-label .required{color:var(--red)}
.form-input,.form-select,.form-textarea{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:14px;outline:none;transition:border-color .2s,box-shadow .2s;font-family:inherit;background:var(--surface);color:var(--text)}
.form-input:focus,.form-select:focus,.form-textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}
.form-textarea{min-height:80px;resize:vertical}
.form-select{cursor:pointer}
.form-hint{font-size:12px;color:var(--text-3)}
.form-hint.success{color:var(--green)}
.form-hint.warn{color:var(--orange)}
.form-row-2{display:grid;grid-template-columns:1fr 1fr;gap:16px}

.bili-url-row{display:flex;gap:8px}
.bili-url-row .form-input{flex:1}

.file-drop-zone{border:2px dashed var(--border);border-radius:var(--radius);padding:32px 16px;text-align:center;cursor:pointer;transition:border-color .2s,background .2s}
.file-drop-zone:hover{border-color:var(--primary);background:var(--bg)}
.file-drop-zone.drag-over{border-color:var(--primary);background:var(--primary-light)}
.file-drop-icon{font-size:36px;margin-bottom:8px}
.file-drop-placeholder>div:last-child{font-size:14px;color:var(--text-2)}
.file-drop-sub{font-size:12px;color:var(--text-3);margin-top:4px}
.file-drop-selected{display:flex;align-items:center;justify-content:center}
.file-info-row{display:flex;align-items:center;gap:12px;padding:8px 16px;background:var(--primary-light);border-radius:var(--radius-sm)}
.file-info-row .file-name{font-size:14px;font-weight:600;color:var(--text)}
.file-info-row .file-size{font-size:12px;color:var(--text-3)}
.file-remove-btn{width:24px;height:24px;border:none;border-radius:50%;background:var(--red);color:#fff;cursor:pointer;font-size:12px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.file-remove-btn:hover{opacity:.8}

.form-actions{display:flex;gap:8px;padding-top:8px}
.form-actions .action-btn{padding:10px 24px;font-size:14px}
.resource-summary{font-size:13px;color:var(--text-3);margin-bottom:12px}
.delete-btn{padding:4px 10px;font-size:12px;border:1px solid var(--border);border-radius:4px;background:none;color:var(--red);cursor:pointer;transition:background .15s}
.delete-btn:hover{background:#fce8ef}

/* ===== 导入 ===== */
.import-desc{font-size:13px;color:var(--text-2);margin-bottom:12px;line-height:1.6}
.import-textarea{width:100%;min-height:200px;padding:12px;border:1px solid var(--border);border-radius:var(--radius-sm);font-family:'Consolas','Monaco',monospace;font-size:13px;outline:none;resize:vertical;transition:border-color .2s}
.import-textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}
.import-actions{display:flex;gap:8px;margin-top:12px}
.import-result{margin-top:16px;font-size:13px}
.import-result.success{color:var(--green)}
.import-result.error{color:var(--red)}
.import-result.info{color:var(--primary)}
.export-preview{margin-top:16px;padding:16px;background:#1a2233;color:#a0d0a0;border-radius:var(--radius-sm);font-family:'Consolas','Monaco',monospace;font-size:12px;overflow-x:auto;max-height:400px;overflow-y:auto}

/* ===== 刷新按钮 ===== */
.refresh-btn{font-size:12px;color:var(--primary);cursor:pointer;margin-left:8px;font-weight:400}

/* ===== Toast ===== */
.toast-container{position:fixed;bottom:24px;right:24px;z-index:2000;display:flex;flex-direction:column;gap:8px}
.toast{padding:12px 20px;border-radius:var(--radius-sm);color:#fff;font-size:14px;box-shadow:var(--shadow-md);animation:slideIn .3s}
.toast.success{background:var(--green)}
.toast.error{background:var(--red)}
.toast.info{background:var(--primary)}
@keyframes slideIn{from{transform:translateX(120%)}to{transform:translateX(0)}}

/* ===== 响应式 ===== */
@media(max-width:768px){
  .dual-panel{grid-template-columns:1fr}
  .tab-nav{padding:8px 16px 0;overflow-x:auto}
  .tab-btn{white-space:nowrap;padding:8px 14px;font-size:13px}
  .tab-panel{padding:16px}
  .stats-cards{grid-template-columns:repeat(2,1fr)}
  .admin-header-inner{padding:0 16px}
}

/* ===== 后台页脚 ===== */
.admin-footer{border-top:1px solid var(--border);background:var(--surface);margin-top:auto;padding:24px 32px;text-align:center}
.admin-footer-inner{max-width:1280px;margin:0 auto}
.admin-footer p{font-size:12px;color:var(--text-3)}
.admin-footer-links{margin:6px 0}
.admin-footer-links a{color:var(--text-2);transition:color .2s}
.admin-footer-links a:hover{color:var(--primary)}
.admin-footer-copy{font-size:11px;color:var(--text-3);margin-top:4px}
.admin-footer-icp{font-size:11px;color:var(--text-3);margin-top:4px}
.admin-footer-icp a{color:var(--text-3);transition:color .2s}
.admin-footer-icp a:hover{color:var(--primary)}
.beian-icon{width:14px;height:14px;vertical-align:middle;margin-right:4px;border-radius:2px}