:root {
  --bg: #0f1420; --panel: #161d2e; --panel-2: #1c2540; --border: #2a3350;
  --text: #e7ebf5; --muted: #8b95b3; --accent: #4c8dff; --ok: #34c77b; --warn: #e0a63c; --err: #e05a5a;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, Segoe UI, Roboto, sans-serif; background: var(--bg); color: var(--text); }
.screen { min-height: 100vh; }
.screen[hidden] { display: none; }

#login-screen { display: flex; align-items: center; justify-content: center; }
.login-card { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 32px; width: 320px; display: flex; flex-direction: column; gap: 12px; }
.login-card h1 { font-size: 20px; margin: 0; }
.login-card label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
.login-card input, .login-card button { padding: 9px 10px; border-radius: 8px; border: 1px solid var(--border); background: var(--panel-2); color: var(--text); font-size: 14px; }
.login-card button[type=submit] { background: var(--accent); border: none; cursor: pointer; font-weight: 600; }

#app-shell { display: flex; }
.sidebar { width: 220px; background: var(--panel); border-right: 1px solid var(--border); display: flex; flex-direction: column; height: 100vh; position: sticky; top: 0; }
.brand { padding: 20px; font-weight: 700; letter-spacing: 0.06em; border-bottom: 1px solid var(--border); }
#main-nav { display: flex; flex-direction: column; padding: 12px; gap: 4px; flex: 1; }
.nav-btn { text-align: left; background: none; border: none; color: var(--muted); padding: 10px 12px; border-radius: 8px; cursor: pointer; font-size: 14px; }
.nav-btn:hover { background: var(--panel-2); color: var(--text); }
.nav-btn.active { background: var(--accent); color: #fff; }
.sidebar-footer { padding: 14px; border-top: 1px solid var(--border); display: flex; flex-direction: column; gap: 8px; font-size: 12px; color: var(--muted); }
.sidebar-footer button.ghost { background: none; border: 1px solid var(--border); color: var(--muted); padding: 6px; border-radius: 6px; cursor: pointer; }

#view-container { flex: 1; padding: 28px 32px; overflow-y: auto; }
.view { display: none; }
.view.active { display: block; }
.view h2 { margin: 0 0 4px; }
.muted { color: var(--muted); font-size: 13px; }
.muted.small { font-size: 12px; }
.error { color: var(--err); font-size: 13px; }

.card { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 20px; margin: 16px 0; }
.card h3 { margin: 0 0 12px; font-size: 15px; }

.form-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; align-items: end; }
.form-grid label { display: flex; flex-direction: column; gap: 4px; font-size: 12px; color: var(--muted); }
.form-grid label.full { grid-column: 1 / -1; }
.form-grid input, .form-grid select { padding: 8px 9px; border-radius: 7px; border: 1px solid var(--border); background: var(--panel-2); color: var(--text); font-size: 13px; }
.form-grid button { padding: 9px 16px; border-radius: 7px; border: none; background: var(--accent); color: #fff; font-weight: 600; cursor: pointer; grid-column: 1 / 2; }

table.grid { width: 100%; border-collapse: collapse; font-size: 13px; }
table.grid th { text-align: left; color: var(--muted); font-weight: 500; padding: 8px 10px; border-bottom: 1px solid var(--border); }
table.grid td { padding: 8px 10px; border-bottom: 1px solid var(--border); }

.chip { display: inline-block; padding: 2px 8px; border-radius: 999px; background: var(--panel-2); font-size: 11px; }
.chip.ok { background: rgba(52,199,123,0.15); color: var(--ok); }
.chip.warn { background: rgba(224,166,60,0.15); color: var(--warn); }

.kpi-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.kpi { background: var(--panel-2); border-radius: 10px; padding: 16px; }
.kpi-value { font-size: 22px; font-weight: 700; }
.kpi-label { font-size: 12px; color: var(--muted); margin-top: 4px; }

@media (max-width: 900px) {
  .form-grid { grid-template-columns: repeat(2, 1fr); }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
}