:root {
    --bg: #f5f4f1;
    --surface: #ffffff;
    --border: #e2e0da;
    --text: #1d1d1d;
    --text-secondary: #6b6a66;
    --accent: #185fa5;
    --warning-bg: #faeeda; --warning-text: #854f0b;
    --accent-bg: #e6f1fb; --accent-text: #0c447c;
    --success-bg: #eaf3de; --success-text: #27500a;
    --radius: 10px;
}

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

header.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky; top: 0; z-index: 10;
}
header.topbar h1 {
    font-size: 16px; font-weight: 600; margin: 0;
    display: flex; align-items: baseline; gap: 6px; flex-wrap: wrap;
}
header.topbar h1 .subtitle { font-size: 12px; font-weight: 400; color: var(--text-secondary); }

nav.tabs {
    display: flex;
    gap: 6px;
    padding: 8px 12px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    overflow-x: auto;
}
nav.tabs button {
    flex: 0 0 auto;
    padding: 8px 14px;
    border: 1px solid var(--border);
    background: var(--bg);
    border-radius: 8px;
    font-size: 13px;
    cursor: pointer;
}
nav.tabs button.active { background: var(--text); color: #fff; border-color: var(--text); }

main { padding: 12px; max-width: 900px; margin: 0 auto; }
.view { display: none; }
.view.active { display: block; }

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 14px;
    margin-bottom: 10px;
}
.card-row { display: flex; justify-content: space-between; align-items: baseline; }
.muted { color: var(--text-secondary); font-size: 12px; }
.badge { font-size: 11px; padding: 3px 8px; border-radius: 8px; display: inline-block; margin-right: 6px; }
.badge.a_facturer { background: var(--warning-bg); color: var(--warning-text); }
.badge.facture { background: var(--accent-bg); color: var(--accent-text); }
.badge.paye { background: var(--success-bg); color: var(--success-text); }

label { font-size: 12px; color: var(--text-secondary); display: block; margin: 8px 0 4px; }
input, select, textarea {
    width: 100%; padding: 8px 10px; border: 1px solid var(--border);
    border-radius: 8px; font-size: 14px; background: #fff; color: var(--text);
}
button.primary {
    width: 100%; padding: 10px; margin-top: 12px; border: none;
    background: var(--text); color: #fff; border-radius: 8px; font-size: 14px; cursor: pointer;
}
button.secondary {
    padding: 8px 12px; border: 1px solid var(--border); background: #fff;
    border-radius: 8px; font-size: 13px; cursor: pointer;
}
.row-gap { display: flex; gap: 8px; }
.row-gap > * { flex: 1; }

.subtabs { display: flex; gap: 6px; margin: 10px 0; }
.subtabs button { font-size: 12px; padding: 5px 10px; border-radius: 8px; border: 1px solid var(--border); background: #fff; cursor: pointer; }
.subtabs button.active { background: var(--bg); font-weight: 600; }

/* Bureau: liste + détail côte à côte */
@media (min-width: 860px) {
    main.desktop-layout { display: grid; grid-template-columns: 300px 1fr; gap: 16px; max-width: 1100px; }
    .desktop-layout .sidebar-list { max-height: calc(100vh - 120px); overflow-y: auto; }
}