:root {
    --bg: #0f172a;
    --surface: #1e293b;
    --surface2: #334155;
    --text: #f8fafc;
    --muted: #94a3b8;
    --accent: #38bdf8;
    --accent2: #0ea5e9;
    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;
    --input-h: 52px;
    --radius: 8px;
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: "Segoe UI", system-ui, sans-serif;
    font-size: 16px;
    background: #0b1220;
    color: var(--text);
}

.app-shell { display: flex; min-height: 100vh; }
.sidebar {
    width: 240px;
    background: var(--bg);
    border-right: 1px solid var(--surface2);
    padding: 1rem;
}
.brand { font-size: 1.4rem; font-weight: 700; margin-bottom: 1.5rem; color: var(--accent); }
.main-content { flex: 1; display: flex; flex-direction: column; }
.topbar {
    display: flex; gap: 1rem; align-items: center; justify-content: flex-end;
    padding: 0.75rem 1.5rem; background: var(--surface); border-bottom: 1px solid var(--surface2);
}
.content { padding: 1.5rem; flex: 1; }

.nav-menu { display: flex; flex-direction: column; gap: 0.35rem; }
.nav-menu a, .btn-link {
    color: var(--muted); text-decoration: none; padding: 0.65rem 0.85rem;
    border-radius: var(--radius); font-size: 1rem;
}
.nav-menu a.active, .nav-menu a:hover { background: var(--surface); color: var(--text); }
.logout-form { margin-top: 1rem; }
.btn-link { background: none; border: none; cursor: pointer; width: 100%; text-align: left; }

h1 { margin: 0 0 1rem; font-size: 1.75rem; }
h2 { margin: 0 0 0.75rem; font-size: 1.25rem; color: var(--muted); }

.card {
    background: var(--surface); border: 1px solid var(--surface2);
    border-radius: var(--radius); padding: 1.25rem; margin-bottom: 1rem;
}

.grid-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-bottom: 1rem; }
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; }

label { display: block; margin-bottom: 0.35rem; color: var(--muted); font-size: 0.9rem; }
input, select, textarea {
    width: 100%; min-height: var(--input-h); padding: 0.65rem 0.85rem;
    font-size: 1.05rem; border-radius: var(--radius); border: 1px solid var(--surface2);
    background: #0b1220; color: var(--text);
}
textarea { min-height: 100px; resize: vertical; }
input:focus, select:focus, textarea:focus {
    outline: 2px solid var(--accent); border-color: var(--accent);
}

.scanner-input {
    font-size: 1.35rem !important; font-weight: 600; letter-spacing: 0.02em;
    border: 2px solid var(--accent2) !important; background: #081018 !important;
}

.btn {
    display: inline-flex; align-items: center; justify-content: center;
    min-height: var(--input-h); padding: 0 1.25rem; border: none; border-radius: var(--radius);
    font-size: 1rem; font-weight: 600; cursor: pointer; text-decoration: none;
}
.btn-primary { background: var(--accent2); color: #041018; }
.btn-secondary { background: var(--surface2); color: var(--text); }
.btn-danger { background: var(--error); color: white; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
th, td { padding: 0.65rem 0.5rem; border-bottom: 1px solid var(--surface2); text-align: left; }
th { color: var(--muted); font-weight: 600; }
tr:hover td { background: rgba(255,255,255,0.02); }

.badge {
    display: inline-block; padding: 0.2rem 0.55rem; border-radius: 999px;
    background: var(--surface2); font-size: 0.8rem;
}
.alert { padding: 0.85rem 1rem; border-radius: var(--radius); margin-bottom: 1rem; }
.alert-error { background: rgba(239,68,68,0.15); border: 1px solid var(--error); }
.alert-success { background: rgba(34,197,94,0.15); border: 1px solid var(--success); }
.alert-warning { background: rgba(245,158,11,0.15); border: 1px solid var(--warning); }

.modal-backdrop {
    position: fixed; inset: 0; background: rgba(0,0,0,0.65);
    display: flex; align-items: center; justify-content: center; z-index: 1000;
}
.modal { background: var(--surface); border-radius: var(--radius); padding: 1.5rem; width: min(640px, 92vw); max-height: 80vh; overflow: auto; }

.preview-line { padding: 0.5rem; border-bottom: 1px solid var(--surface2); }
.preview-line.error { color: var(--error); }
.preview-line.warning { color: var(--warning); }

@media (max-width: 900px) {
    .app-shell { flex-direction: column; }
    .sidebar { width: 100%; }
}