:root {
    --bg: #f3f4f6;
    --card: #ffffff;
    --text: #172033;
    --muted: #687085;
    --border: #d9deea;
    --accent: #0d8f7a;
    --danger: #b42318;
    --warn: #b54708;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: "Segoe UI", Tahoma, sans-serif; background: var(--bg); color: var(--text); }
a { color: #1848aa; text-decoration: none; }
a:hover { text-decoration: underline; }
.app-shell { display: grid; grid-template-columns: 250px 1fr; min-height: 100vh; }
.sidebar { background: #18243d; color: #fff; padding: 1rem; display: flex; flex-direction: column; }
.sidebar h1 { margin-top: 0; font-size: 1rem; }
.sidebar nav { display: grid; gap: .5rem; margin: 1rem 0; }
.sidebar nav a { color: #d9e2ff; padding: .3rem 0; }
.content { padding: 1.2rem; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 1rem; margin-bottom: 1rem; }
.grid { display: grid; gap: 1rem; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.kpi { font-size: 1.7rem; font-weight: 700; }
.muted { color: var(--muted); font-size: .9rem; }
table { width: 100%; border-collapse: collapse; background: #fff; }
th, td { border: 1px solid var(--border); padding: .55rem; text-align: left; }
th { background: #eef2fb; font-size: .9rem; }
form.inline { display: inline-block; }
form .row { margin-bottom: .7rem; }
input, select, textarea, button { width: 100%; padding: .55rem; border: 1px solid var(--border); border-radius: 6px; font: inherit; }
button, .btn { display: inline-block; width: auto; background: var(--accent); color: #fff; border: 0; cursor: pointer; padding: .55rem .9rem; border-radius: 6px; }
.btn-secondary { background: #535d75; }
.btn-danger { background: var(--danger); }
.flash { padding: .7rem .9rem; border-radius: 6px; margin-bottom: .75rem; }
.flash-success { background: #e7f8ef; color: #086a2e; border: 1px solid #9fd9b6; }
.flash-error { background: #fbe8e7; color: #8f1e1e; border: 1px solid #ebb0ad; }
.flash-info { background: #e7f0fd; color: #143b7b; border: 1px solid #a8c0f0; }
.badge { display: inline-block; padding: .2rem .5rem; border-radius: 999px; font-size: .75rem; }
.badge-danger { background: #fce7e6; color: #9f1f1f; }
.badge-ok { background: #e3f7ec; color: #0d7a3a; }
.actions { display: flex; gap: .4rem; flex-wrap: wrap; }
.sidebar-logo-wrap { margin-top: auto; padding-top: 1rem; border-top: 1px solid rgba(255,255,255,.15); }
.sidebar-logo { max-width: 100%; max-height: 84px; object-fit: contain; display: block; margin: 0 auto; background: #fff; border-radius: 8px; padding: .4rem; }
@media (max-width: 900px) {
    .app-shell { grid-template-columns: 1fr; }
    .sidebar { position: sticky; top: 0; z-index: 2; }
}