:root{
    --bg:#f5f7fa; --card:#fff; --border:#e2e8f0;
    --text:#1a202c; --muted:#718096;
    --primary:#3182ce; --primary-hover:#2c5282;
    --danger:#e53e3e; --success:#38a169;
}
*{box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
     background:var(--bg);color:var(--text);margin:0;line-height:1.5;font-size:15px}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}

.topbar{background:#fff;border-bottom:1px solid var(--border)}
.topbar-inner{max-width:1100px;margin:0 auto;display:flex;align-items:center;
              justify-content:space-between;padding:14px 20px}
.brand{font-weight:700;font-size:18px;color:var(--text)}
.nav{display:flex;align-items:center;gap:18px;font-size:14px}
.nav-user{color:var(--muted)}
.btn-link{color:var(--danger)}

.container{max-width:1100px;margin:30px auto;padding:0 20px}
.footer{text-align:center;color:var(--muted);font-size:13px;padding:30px 0}

h1{font-size:24px;margin:0 0 8px}
h2{font-size:20px;margin:0 0 12px}
.subtitle{color:var(--muted);margin:0 0 24px}

.card{background:var(--card);border:1px solid var(--border);border-radius:8px;
      padding:24px;margin-bottom:20px}
.card-row{display:flex;justify-content:space-between;align-items:center;
          margin-bottom:16px;flex-wrap:wrap;gap:10px}

.btn{display:inline-block;padding:8px 16px;border-radius:6px;border:1px solid transparent;
     cursor:pointer;font-size:14px;font-weight:500;text-decoration:none;
     background:var(--primary);color:#fff;transition:.15s}
.btn:hover{background:var(--primary-hover);text-decoration:none}
.btn-secondary{background:#edf2f7;color:var(--text)}
.btn-secondary:hover{background:#e2e8f0}
.btn-danger{background:var(--danger)}
.btn-danger:hover{background:#c53030}
.btn-sm{padding:5px 12px;font-size:13px}

table{width:100%;border-collapse:collapse}
th,td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--border)}
th{font-size:13px;text-transform:uppercase;color:var(--muted);font-weight:600}
tr:last-child td{border-bottom:none}

.form-group{margin-bottom:16px}
.form-group label{display:block;margin-bottom:6px;font-weight:500;font-size:14px}
.form-group input,.form-group select,.form-group textarea{
    width:100%;padding:9px 12px;border:1px solid var(--border);
    border-radius:6px;font-size:14px;font-family:inherit
}
.form-group input:focus,.form-group textarea:focus{
    outline:none;border-color:var(--primary)
}
.form-group .hint{font-size:12px;color:var(--muted);margin-top:4px}
.form-actions{display:flex;gap:10px;margin-top:20px}

.alert{padding:12px 16px;border-radius:6px;margin-bottom:16px;font-size:14px}
.alert-error{background:#fed7d7;color:#742a2a}
.alert-success{background:#c6f6d5;color:#22543d}

.badge{display:inline-block;padding:2px 8px;border-radius:10px;font-size:12px}
.badge-on{background:#c6f6d5;color:#22543d}
.badge-off{background:#fed7d7;color:#742a2a}

.login-wrap{max-width:380px;margin:80px auto;padding:0 20px}
.login-wrap .card{padding:32px}
.login-wrap h1{text-align:center;font-size:22px;margin-bottom:24px}

.dropdown { position: relative; display: inline-block; }
.dropdown-content {
    display: none; position: absolute; right: 0; top: 100%;
    background: #fff; min-width: 170px; box-shadow: 0 4px 12px rgba(0,0,0,.12);
    border-radius: 6px; z-index: 10; padding: 6px 0; border: 1px solid var(--border);
}
.dropdown:hover .dropdown-content { display: block; }
.dropdown-content a { display: block; padding: 8px 14px; color: var(--text); font-size: 14px; }
.dropdown-content a:hover { background: var(--bg); text-decoration: none; }