:root {
    --red: #c40909; --red-light: #e53838; --dark: #222; --gray-bg: #f4f4f4;
    --gray-border: #e6e6e6; --gray-line: #d6d6d6; --text: #333;
    --text-light: #777; --text-muted: #999; --white: #fff;
}
* { margin:0; padding:0; box-sizing:border-box; }
body { font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif; color:var(--text); background:var(--gray-bg); min-height:100vh; }

/* Login */
.login-wrapper { display:flex; align-items:center; justify-content:center; min-height:100vh; background:linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%); }
.login-box { background:#fff; padding:50px 40px; border-radius:8px; width:400px; box-shadow:0 20px 60px rgba(0,0,0,0.3); }
.login-box h1 { text-align:center; font-size:24px; color:var(--dark); margin-bottom:8px; }
.login-box .sub { text-align:center; color:var(--text-muted); font-size:13px; margin-bottom:32px; }
.login-box .form-group { margin-bottom:20px; }
.login-box label { display:block; font-size:14px; color:var(--text); margin-bottom:6px; font-weight:bold; }
.login-box input[type="text"], .login-box input[type="password"] { width:100%; height:44px; padding:0 14px; border:1px solid var(--gray-border); border-radius:4px; font-size:14px; transition:border 0.2s; }
.login-box input:focus { border-color:var(--red); outline:none; }
.login-box button { width:100%; height:44px; background:var(--red); color:#fff; border:none; border-radius:4px; font-size:16px; cursor:pointer; transition:background 0.2s; }
.login-box button:hover { background:#a00808; }
.login-box .error { color:var(--red); font-size:13px; text-align:center; margin-top:12px; display:none; }

/* Top Header Bar */
.admin-header { position:sticky; top:0; z-index:1001; background:var(--dark); color:#fff; height:48px; display:flex; align-items:center; justify-content:center; padding:0 20px; gap:0; box-shadow:0 2px 8px rgba(0,0,0,0.15); }
.admin-header a { display:flex; align-items:center; gap:6px; color:#bbb; text-decoration:none; font-size:13px; padding:0 18px; height:100%; border-bottom:2px solid transparent; transition:all 0.2s; }
.admin-header a:hover { color:#fff; border-bottom-color:var(--red); background:rgba(255,255,255,0.05); }

/* Layout */
.admin-layout { display:flex; min-height:100vh; }
.admin-sidebar { width:240px; background:var(--dark); color:#fff; flex-shrink:0; position:fixed; left:0; top:48px; bottom:0; overflow-y:auto; z-index:100; }
.admin-layout { padding-left:240px; }
.admin-sidebar .logo { padding:24px 20px; border-bottom:1px solid rgba(255,255,255,0.08); }
.admin-sidebar .logo img { height:32px; }
.admin-sidebar .logo span { color:#fff; font-size:14px; margin-left:8px; }
.admin-sidebar nav a { display:block; padding:14px 24px; color:#bbb; text-decoration:none; font-size:14px; border-left:3px solid transparent; transition:all 0.2s; }
.admin-sidebar nav a:hover, .admin-sidebar nav a.active { color:#fff; background:rgba(255,255,255,0.05); border-left-color:var(--red); }
.admin-sidebar .logout { padding:14px 24px; color:#888; cursor:pointer; font-size:13px; border-top:1px solid rgba(255,255,255,0.08); margin-top:20px; }
.admin-sidebar .logout:hover { color:var(--red); }

/* Sticky subnav inside pages (footer-manager etc.) */
.admin-subnav { position:sticky; top:48px; align-self:flex-start; max-height:calc(100vh - 48px); overflow-y:auto; }

.admin-main { flex:1; padding:30px; overflow-y:auto; }
.admin-main .page-title { font-size:22px; font-weight:bold; margin-bottom:24px; color:var(--dark); }

/* Cards */
.card { background:#fff; border-radius:6px; padding:24px; margin-bottom:20px; box-shadow:0 1px 4px rgba(0,0,0,0.06); }
.card h3 { font-size:16px; margin-bottom:16px; color:var(--dark); padding-bottom:12px; border-bottom:1px solid var(--gray-border); }

/* Stats */
.stats-grid { display:grid; grid-template-columns:repeat(4, 1fr); gap:16px; margin-bottom:24px; }
.stat-card { background:#fff; padding:24px; border-radius:6px; box-shadow:0 1px 4px rgba(0,0,0,0.06); text-align:center; }
.stat-card .num { font-size:36px; font-weight:700; color:var(--red); }
.stat-card .label { font-size:13px; color:var(--text-muted); margin-top:4px; }

/* Tables */
table { width:100%; border-collapse:collapse; }
th, td { padding:12px 16px; text-align:left; border-bottom:1px solid var(--gray-border); font-size:14px; }
th { background:var(--gray-bg); font-weight:bold; color:var(--text); }
tr:hover td { background:#fdf8f8; }

/* Buttons */
.btn { display:inline-block; padding:8px 20px; border:none; border-radius:4px; font-size:14px; cursor:pointer; text-decoration:none; transition:all 0.2s; }
.btn-red { background:var(--red); color:#fff; }
.btn-red:hover { background:#a00808; }
.btn-outline { background:#fff; color:var(--red); border:1px solid var(--red); }
.btn-outline:hover { background:var(--red); color:#fff; }
.btn-sm { padding:5px 12px; font-size:12px; }
.btn-gray { background:#eee; color:#666; }
.btn-gray:hover { background:#ddd; }
.btn-danger { background:#e74c3c; color:#fff; }
.btn-danger:hover { background:#c0392b; }

/* Forms */
.form-group { margin-bottom:16px; }
.form-group label { display:block; font-size:14px; font-weight:bold; margin-bottom:6px; color:var(--text); }
.form-group input, .form-group select, .form-group textarea { width:100%; padding:10px 14px; border:1px solid var(--gray-border); border-radius:4px; font-size:14px; font-family:inherit; }
.form-group textarea { min-height:200px; resize:vertical; }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color:var(--red); outline:none; }
.form-row { display:flex; gap:16px; }
.form-row .form-group { flex:1; }

/* Modal */
.modal-overlay { display:none; position:fixed; inset:0; background:rgba(0,0,0,0.5); z-index:1000; justify-content:center; align-items:center; }
.modal-overlay.show { display:flex; }
.modal { background:#fff; border-radius:8px; padding:30px; width:500px; max-width:90vw; max-height:80vh; overflow-y:auto; box-shadow:0 20px 60px rgba(0,0,0,0.3); }
.modal h3 { margin-bottom:20px; }

/* Toast */
.toast { position:fixed; top:20px; right:20px; z-index:2000; padding:14px 24px; border-radius:6px; color:#fff; font-size:14px; display:none; animation:fadeIn 0.3s; }
.toast.success { background:#27ae60; }
.toast.error { background:#e74c3c; }
@keyframes fadeIn { from{opacity:0;transform:translateY(-10px)} to{opacity:1;transform:translateY(0)} }

/* Nav tree */
.nav-tree { list-style:none; }
.nav-tree li { margin-bottom:4px; }
.nav-tree .nav-item { display:flex; align-items:center; gap:8px; padding:8px 12px; background:var(--gray-bg); border-radius:4px; margin-bottom:4px; }
.nav-tree .nav-item .name { flex:1; font-size:14px; font-weight:bold; }
.nav-tree .nav-item .url { font-size:12px; color:var(--text-muted); }
.nav-tree .sub-items { margin-left:32px; }
.nav-tree .sub-items .nav-item { background:#fdf8f8; }

/* Content editor toolbar */
.editor-toolbar { display:flex; gap:8px; margin-bottom:8px; flex-wrap:wrap; }
.editor-toolbar button { padding:4px 10px; border:1px solid var(--gray-border); background:#fff; border-radius:3px; cursor:pointer; font-size:12px; }
.editor-toolbar button:hover { background:var(--gray-bg); }

/* Collapsible sidebar */
.admin-sidebar .nav-parent { display:flex; align-items:center; justify-content:space-between; cursor:pointer; user-select:none; }
.admin-sidebar .nav-parent .arrow { font-size:10px; transition:transform 0.2s; }
.admin-sidebar .nav-parent.collapsed .arrow { transform:rotate(-90deg); }
.admin-sidebar .nav-children { overflow:hidden; transition:max-height 0.3s; max-height:700px; }
.admin-sidebar .nav-children.collapsed { max-height:0; }
.admin-sidebar .nav-children a { padding-left:40px; font-size:13px; }

/* Hide chat widget on admin pages */
.chat-widget { display:none !important; }