:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-2: #334155;
  --border: #475569;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --accent: #6366f1;
  --accent-2: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; background: var(--bg); color: var(--text); font-family: -apple-system, Segoe UI, Roboto, sans-serif; }

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

/* Login */
.login-wrap { margin: auto; width: 400px; padding: 32px; background: var(--surface); border-radius: 16px; border: 1px solid var(--border); }
.login-wrap h1 { margin: 0 0 24px; text-align: center; }
.login-wrap input { width: 100%; padding: 12px; margin-bottom: 12px; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; color: var(--text); }
.login-wrap button { width: 100%; padding: 12px; background: var(--accent); color: #fff; border: none; border-radius: 8px; font-weight: 600; cursor: pointer; }
.login-wrap button:hover { background: #4f46e5; }
.login-wrap .err { color: var(--danger); margin-bottom: 12px; text-align: center; }

/* Shell */
.sidebar { width: 240px; background: var(--surface); border-right: 1px solid var(--border); display: flex; flex-direction: column; }
.sidebar .brand { padding: 20px; border-bottom: 1px solid var(--border); font-size: 20px; font-weight: 700; }
.sidebar .brand small { display: block; color: var(--muted); font-size: 11px; font-weight: 400; margin-top: 2px; }
.sidebar nav { flex: 1; padding: 12px 0; }
.sidebar nav a { display: flex; gap: 10px; align-items: center; padding: 10px 20px; color: var(--text); text-decoration: none; cursor: pointer; border-left: 3px solid transparent; }
.sidebar nav a:hover { background: rgba(99,102,241,0.1); }
.sidebar nav a.active { background: rgba(99,102,241,0.15); border-left-color: var(--accent); }
.sidebar .user-box { padding: 16px 20px; border-top: 1px solid var(--border); font-size: 13px; }
.sidebar .user-box .logout { color: var(--danger); cursor: pointer; margin-top: 4px; display: inline-block; }

.main { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
.topbar { padding: 14px 24px; border-bottom: 1px solid var(--border); background: var(--surface); display: flex; align-items: center; gap: 16px; }
.topbar h2 { margin: 0; font-size: 18px; }
.topbar .spacer { flex: 1; }
.content { flex: 1; overflow: auto; padding: 24px; }

/* Common UI */
.btn { display: inline-flex; gap: 6px; align-items: center; padding: 8px 14px; border-radius: 8px; border: 1px solid var(--border); background: var(--surface-2); color: var(--text); cursor: pointer; font-size: 13px; }
.btn:hover { background: var(--border); }
.btn.primary { background: var(--accent); border-color: var(--accent); }
.btn.primary:hover { background: #4f46e5; }
.btn.danger { background: var(--danger); border-color: var(--danger); }
.btn.sm { padding: 4px 10px; font-size: 12px; }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 20px; margin-bottom: 16px; }
.card h3 { margin: 0 0 14px; font-size: 15px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.5px; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 20px; }
.stat .label { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.5px; }
.stat .value { font-size: 32px; font-weight: 700; margin-top: 6px; }

table { width: 100%; border-collapse: collapse; }
table th, table td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); font-size: 13px; }
table th { color: var(--muted); font-weight: 600; text-transform: uppercase; font-size: 11px; letter-spacing: 0.5px; }
table tbody tr:hover { background: rgba(99,102,241,0.05); cursor: pointer; }

.badge { display: inline-block; padding: 2px 10px; border-radius: 10px; font-size: 11px; font-weight: 600; }
.badge.reserved { background: rgba(245,158,11,0.2); color: var(--warning); }
.badge.active { background: rgba(34,197,94,0.2); color: var(--accent-2); }
.badge.completed { background: rgba(99,102,241,0.2); color: var(--accent); }
.badge.cancelled { background: rgba(239,68,68,0.2); color: var(--danger); }

/* Modal */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.6); display: flex; align-items: center; justify-content: center; z-index: 100; }
.modal { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 24px; width: 520px; max-width: 92vw; max-height: 90vh; overflow: auto; }
.modal h3 { margin: 0 0 18px; }
.form-row { margin-bottom: 12px; }
.form-row label { display: block; font-size: 12px; color: var(--muted); margin-bottom: 4px; text-transform: uppercase; letter-spacing: 0.5px; }
.form-row input, .form-row select, .form-row textarea { width: 100%; padding: 10px 12px; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: 14px; }
.form-row textarea { min-height: 70px; resize: vertical; }
.form-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 20px; }

.two-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* Tabs */
.tabs { display: flex; gap: 2px; border-bottom: 1px solid var(--border); margin-bottom: 16px; }
.tabs .tab { padding: 10px 16px; cursor: pointer; color: var(--muted); border-bottom: 2px solid transparent; }
.tabs .tab.active { color: var(--text); border-bottom-color: var(--accent); }

.empty { text-align: center; color: var(--muted); padding: 40px; }