:root{
  --sidebar-w: 240px;
  --topbar-h: 60px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --primary: #2e7d32;
  --primary-dark: #1b5e20;
  --bg: #f4f6f5;
  --card-bg: #ffffff;
  --border: #e2e6e4;
  --text: #202722;
  --text-muted: #6b7570;
  --danger: #c62828;
  --success: #2e7d32;
  --warning: #ef6c00;
}
body.theme-blue{ --primary:#1565c0; --primary-dark:#0d47a1; }
body.theme-amber{ --primary:#ef6c00; --primary-dark:#e65100; }
body.theme-brown{ --primary:#6d4c41; --primary-dark:#4e342e; }

*{box-sizing:border-box;}
body{margin:0;font-family:var(--font);background:var(--bg);color:var(--text);}
a{color:var(--primary);text-decoration:none;}
a:hover{text-decoration:underline;}

.app-shell{display:flex;min-height:100vh;}

.sidebar{
  width:var(--sidebar-w);flex-shrink:0;background:var(--primary-dark);color:#fff;
  display:flex;flex-direction:column;
}
.sidebar-brand{display:flex;align-items:center;gap:10px;padding:18px 16px;font-weight:600;font-size:16px;border-bottom:1px solid rgba(255,255,255,.15);}
.sidebar-brand img{max-height:32px;}
.sidebar-nav{flex:1;padding:12px 0;overflow-y:auto;}
.nav-section-label{padding:14px 16px 6px;font-size:11px;text-transform:uppercase;letter-spacing:.06em;color:rgba(255,255,255,.55);}
.sidebar-nav a{display:block;padding:9px 16px;color:rgba(255,255,255,.9);font-size:14px;}
.sidebar-nav a:hover{background:rgba(255,255,255,.08);text-decoration:none;}
.sidebar-nav a.active{background:rgba(255,255,255,.16);font-weight:600;border-left:3px solid #fff;}
.sidebar-note{padding:14px 16px;font-size:11px;color:rgba(255,255,255,.5);border-top:1px solid rgba(255,255,255,.15);}

.main-col{flex:1;display:flex;flex-direction:column;min-width:0;}
.topbar{height:var(--topbar-h);background:var(--card-bg);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 24px;}
.topbar-title{font-size:18px;font-weight:600;}
.topbar-user{display:flex;align-items:center;gap:14px;font-size:14px;color:var(--text-muted);}
.btn-link{color:var(--danger);font-weight:600;}

.content{flex:1;padding:24px;}
.app-footer{padding:14px 24px;font-size:12px;color:var(--text-muted);border-top:1px solid var(--border);}

.card{background:var(--card-bg);border:1px solid var(--border);border-radius:10px;padding:20px;margin-bottom:20px;}
.card h2, .card h3{margin-top:0;}

.alert{padding:10px 14px;border-radius:8px;margin-bottom:14px;font-size:14px;}
.alert-success{background:#e8f5e9;color:var(--success);border:1px solid #c8e6c9;}
.alert-error{background:#ffebee;color:var(--danger);border:1px solid #ffcdd2;}
.alert-info{background:#e3f2fd;color:#1565c0;border:1px solid #bbdefb;}
.alert-warning{background:#fff3e0;color:var(--warning);border:1px solid #ffe0b2;}

table{width:100%;border-collapse:collapse;font-size:14px;}
th,td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--border);}
th{background:#fafbfa;font-weight:600;color:var(--text-muted);font-size:12px;text-transform:uppercase;letter-spacing:.03em;}
tr:hover td{background:#fafbfa;}

.btn{display:inline-block;padding:8px 16px;border-radius:8px;border:none;background:var(--primary);color:#fff;font-size:14px;cursor:pointer;}
.btn:hover{background:var(--primary-dark);text-decoration:none;}
.btn-secondary{background:#e2e6e4;color:var(--text);}
.btn-secondary:hover{background:#d3d8d5;}
.btn-danger{background:var(--danger);}
.btn-danger:hover{background:#8e1f1f;}
.btn-sm{padding:4px 10px;font-size:12px;}

.form-group{margin-bottom:16px;}
.form-group label{display:block;margin-bottom:6px;font-size:13px;font-weight:600;color:var(--text-muted);}
.form-group input[type=text],
.form-group input[type=email],
.form-group input[type=password],
.form-group input[type=number],
.form-group input[type=tel],
.form-group input[type=file],
.form-group select,
.form-group textarea{
  width:100%;padding:9px 12px;border:1px solid var(--border);border-radius:8px;font-size:14px;font-family:var(--font);
}
.form-row{display:flex;gap:16px;flex-wrap:wrap;}
.form-row .form-group{flex:1;min-width:200px;}

.badge{display:inline-block;padding:3px 9px;border-radius:20px;font-size:11px;font-weight:600;}
.badge-active,.badge-paid{background:#e8f5e9;color:var(--success);}
.badge-inactive,.badge-unpaid{background:#ffebee;color:var(--danger);}
.badge-partial{background:#fff3e0;color:var(--warning);}

.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-bottom:20px;}
.stat-card{background:var(--card-bg);border:1px solid var(--border);border-radius:10px;padding:18px;}
.stat-card .stat-label{font-size:12px;color:var(--text-muted);text-transform:uppercase;letter-spacing:.03em;}
.stat-card .stat-value{font-size:26px;font-weight:700;margin-top:6px;}

.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--bg);}
.login-box{width:360px;background:var(--card-bg);border:1px solid var(--border);border-radius:12px;padding:32px;}
.login-box h1{font-size:20px;text-align:center;margin-bottom:24px;}