:root {
    --bg: #f5f7fa;
    --panel: #ffffff;
    --panel-2: #f8fafc;
    --border: #e6e9ef;
    --text: #1f2937;
    --muted: #6b7280;
    --accent: #2563eb;
    --accent-2: #3b82f6;
    --green: #16a34a;
    --green-bg: #ecfdf3;
    --red: #dc2626;
    --red-bg: #fef2f2;
    --orange: #d97706;
    --orange-bg: #fffbeb;
    --blue-bg: #eff6ff;
    --shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 1px 2px rgba(16, 24, 40, .04);
    --shadow-lg: 0 10px 30px rgba(16, 24, 40, .12);
    --radius: 12px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif; background: var(--bg); color: var(--text); font-size: 14px; line-height: 1.5; }

/* 登录页 */
.login-body { display: flex; align-items: center; justify-content: center; min-height: 100vh; padding: 20px; background: linear-gradient(160deg, #eef2ff 0%, var(--bg) 60%); }
.login-card { background: var(--panel); border: 1px solid var(--border); border-radius: 18px; padding: 40px 44px; width: 400px; max-width: 100%; box-shadow: var(--shadow-lg); }
.login-card .logo { width: 52px; height: 52px; border-radius: 14px; background: var(--accent); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 26px; margin-bottom: 18px; }
.login-card h1 { font-size: 22px; font-weight: 700; margin-bottom: 4px; }
.login-card .sub { color: var(--muted); margin-bottom: 26px; font-size: 13px; }
.login-card label { display: block; color: var(--muted); margin: 14px 0 6px; font-size: 13px; font-weight: 500; }
.login-card .btn-primary { width: 100%; margin-top: 22px; }

/* 布局 */
.layout { display: flex; min-height: 100vh; }
.sidebar { width: 230px; background: var(--panel); border-right: 1px solid var(--border); display: flex; flex-direction: column; padding: 20px 14px; position: sticky; top: 0; height: 100vh; }
.brand { display: flex; align-items: center; gap: 10px; padding: 4px 10px 20px; font-size: 16px; font-weight: 700; }
.brand-icon { width: 34px; height: 34px; border-radius: 10px; background: var(--accent); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 17px; }
.nav { display: flex; flex-direction: column; gap: 4px; }
.nav-item { display: flex; align-items: center; gap: 10px; width: 100%; text-align: left; padding: 11px 14px; border: none; background: transparent; color: var(--muted); font-size: 14px; font-weight: 500; border-radius: 10px; cursor: pointer; transition: all .15s; }
.nav-item:hover { background: var(--panel-2); color: var(--text); }
.nav-item.active { background: var(--blue-bg); color: var(--accent); }
.nav-ico { font-size: 16px; }
.sidebar-foot { margin-top: auto; padding: 14px 10px 4px; border-top: 1px solid var(--border); }
.foot-user { font-size: 13px; font-weight: 600; margin-bottom: 6px; }
.foot-logout { display: inline-block; font-size: 13px; color: var(--accent); text-decoration: none; }
.foot-logout:hover { text-decoration: underline; }

.content { flex: 1; padding: 28px 32px; overflow-x: auto; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.toolbar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; flex-wrap: wrap; gap: 12px; }
.toolbar h2 { font-size: 20px; font-weight: 700; }
.actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }

/* 表单 */
input, select { background: var(--panel); border: 1px solid var(--border); color: var(--text); padding: 9px 12px; border-radius: 10px; font-size: 14px; outline: none; transition: border-color .15s, box-shadow .15s; }
input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(37, 99, 235, .12); }
label { display: block; color: var(--muted); margin: 12px 0 6px; font-size: 13px; }

/* 按钮 */
.btn { background: var(--panel); border: 1px solid var(--border); color: var(--text); padding: 9px 16px; border-radius: 10px; cursor: pointer; font-size: 14px; font-weight: 500; transition: all .15s; }
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn-primary { background: var(--accent); border: none; color: #fff; padding: 9px 18px; border-radius: 10px; cursor: pointer; font-size: 14px; font-weight: 600; transition: all .15s; }
.btn-primary:hover { background: var(--accent-2); }
.btn-sm { padding: 5px 11px; font-size: 12px; border-radius: 8px; }
.btn-danger { background: var(--red-bg); border: 1px solid #fecaca; color: var(--red); }
.btn-danger:hover { background: var(--red); border-color: var(--red); color: #fff; }
.btn:disabled { opacity: .45; cursor: not-allowed; }

/* 统计卡片 */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 14px; margin-bottom: 22px; }
.stat-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow); }
.stat-card .num { font-size: 28px; font-weight: 700; letter-spacing: -.5px; }
.stat-card .lbl { color: var(--muted); font-size: 12px; margin-top: 4px; }

/* 表格 */
.table-wrap { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--border); white-space: nowrap; }
.table th { color: var(--muted); font-weight: 600; font-size: 12px; background: var(--panel-2); text-transform: uppercase; letter-spacing: .3px; }
.table tr:last-child td { border-bottom: none; }
.table tbody tr:hover td { background: var(--panel-2); }
.code { font-family: Consolas, "SF Mono", monospace; font-size: 12px; color: var(--accent); }
.tag { display: inline-block; padding: 3px 10px; border-radius: 20px; font-size: 12px; font-weight: 500; }
.tag.active { background: var(--green-bg); color: var(--green); }
.tag.disabled { background: var(--red-bg); color: var(--red); }
.tag.file { background: var(--blue-bg); color: var(--accent); }
.tag.folder { background: var(--orange-bg); color: var(--orange); }

/* 分页 */
.pager { margin-top: 16px; display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.pager button { background: var(--panel); border: 1px solid var(--border); color: var(--text); padding: 6px 12px; border-radius: 8px; cursor: pointer; font-size: 13px; transition: all .15s; }
.pager button:hover:not(:disabled):not(.active) { border-color: var(--accent); color: var(--accent); }
.pager button.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.pager button:disabled { opacity: .4; cursor: not-allowed; }
.pager .pager-total { color: var(--muted); margin-left: 8px; font-size: 13px; }

/* 弹窗 */
.modal { position: fixed; inset: 0; background: rgba(17, 24, 39, .45); backdrop-filter: blur(2px); display: flex; align-items: center; justify-content: center; z-index: 50; padding: 20px; }
.modal-box { background: var(--panel); border-radius: 16px; padding: 26px 28px; width: 420px; max-width: 100%; box-shadow: var(--shadow-lg); }
.modal-box h3 { font-size: 18px; font-weight: 700; margin-bottom: 6px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 22px; }

/* 提示 */
.alert-error { background: var(--red-bg); border: 1px solid #fecaca; color: var(--red); padding: 10px 14px; border-radius: 10px; margin-bottom: 16px; font-size: 13px; }
.toast { position: fixed; top: 20px; left: 50%; transform: translateX(-50%); background: #111827; color: #fff; padding: 10px 22px; border-radius: 10px; z-index: 100; font-size: 14px; box-shadow: var(--shadow-lg); animation: fadeIn .2s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translate(-50%, -8px); } to { opacity: 1; transform: translate(-50%, 0); } }

/* 响应式 */
@media (max-width: 768px) {
    .layout { flex-direction: column; }
    .sidebar { width: 100%; height: auto; position: static; flex-direction: row; align-items: center; padding: 12px 16px; }
    .brand { padding: 0 10px 0 0; }
    .nav { flex-direction: row; }
    .nav-item { padding: 9px 12px; }
    .sidebar-foot { margin-top: 0; margin-left: auto; border-top: none; padding: 0; }
    .content { padding: 18px 16px; }
    .cards { grid-template-columns: repeat(2, 1fr); }
}