:root {
    --bleu: #1e4f9c;
    --bleu-fonce: #163b78;
    --bleu-clair: #eaf1fb;
    --gris: #6b7280;
    --gris-clair: #f4f5f7;
    --bordure: #e2e5ea;
    --rouge: #c0392b;
    --vert: #1e8449;
    --orange: #d68910;
    --blanc: #ffffff;
    --radius: 6px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: "Segoe UI", Arial, sans-serif;
    background: var(--gris-clair);
    color: #222;
    font-size: 14px;
}

a { color: var(--bleu); text-decoration: none; }
a:hover { text-decoration: underline; }

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

/* Sidebar */
.sidebar {
    width: 230px;
    background: var(--bleu-fonce);
    color: #fff;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
}
.sidebar-brand {
    padding: 18px 16px;
    font-weight: 700;
    font-size: 16px;
    border-bottom: 1px solid rgba(255,255,255,.15);
    display: flex;
    align-items: center;
    gap: 8px;
}
.brand-logo { width: 28px; height: 28px; object-fit: contain; border-radius: 4px; background: #fff; }
.sidebar-nav { display: flex; flex-direction: column; padding: 10px 0; }
.sidebar-nav a {
    color: #dce6f7;
    padding: 10px 18px;
    border-left: 3px solid transparent;
}
.sidebar-nav a:hover { background: rgba(255,255,255,.08); text-decoration: none; }
.sidebar-nav a.active { background: rgba(255,255,255,.12); border-left-color: #fff; color: #fff; font-weight: 600; }
.nav-sep { height: 1px; background: rgba(255,255,255,.15); margin: 10px 18px; }

/* Main */
.main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar {
    background: #fff;
    border-bottom: 1px solid var(--bordure);
    padding: 14px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.topbar h1 { font-size: 19px; margin: 0; }
.topbar-user { display: flex; align-items: center; gap: 14px; color: var(--gris); }
.content { padding: 24px; }

/* Alerts */
.alert { padding: 12px 16px; border-radius: var(--radius); margin-bottom: 18px; }
.alert-success { background: #e6f4ea; color: var(--vert); border: 1px solid #b9e2c6; }
.alert-error { background: #fdecea; color: var(--rouge); border: 1px solid #f3c1bb; }
.alert-warning { background: #fef6e0; color: var(--orange); border: 1px solid #f6dfa0; }

/* Cards / panels */
.panel { background: #fff; border: 1px solid var(--bordure); border-radius: var(--radius); padding: 20px; margin-bottom: 20px; }
.panel-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.panel-header h2 { margin: 0; font-size: 16px; }

/* Toolbar */
.toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; gap: 12px; flex-wrap: wrap; }
.toolbar .filters { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

/* Buttons */
.btn {
    display: inline-block;
    padding: 8px 16px;
    border-radius: var(--radius);
    border: 1px solid var(--bleu);
    background: var(--bleu);
    color: #fff;
    cursor: pointer;
    font-size: 14px;
    text-align: center;
}
.btn:hover { background: var(--bleu-fonce); text-decoration: none; }
.btn-secondary { background: #fff; color: var(--bleu); }
.btn-secondary:hover { background: var(--bleu-clair); }
.btn-danger { background: #fff; color: var(--rouge); border-color: var(--rouge); }
.btn-danger:hover { background: #fdecea; }
.btn-sm { padding: 4px 10px; font-size: 12.5px; }
.btn-link { color: var(--bleu); background: none; border: none; cursor: pointer; padding: 0; }
.actions { display: flex; gap: 8px; }

/* Forms */
.form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.form-grid.cols-1 { grid-template-columns: 1fr; }
.form-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.form-grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-weight: 600; font-size: 13px; color: #444; }
.field input, .field select, .field textarea {
    padding: 8px 10px;
    border: 1px solid var(--bordure);
    border-radius: var(--radius);
    font-size: 14px;
    font-family: inherit;
}
.field textarea { resize: vertical; }
.field-error { color: var(--rouge); font-size: 12.5px; }
.form-actions { display: flex; gap: 10px; margin-top: 20px; }
.checkbox-row { display: flex; align-items: center; gap: 8px; }
.checkbox-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }

/* Table */
table.data-table { width: 100%; border-collapse: collapse; background: #fff; }
table.data-table th, table.data-table td { padding: 10px 12px; border-bottom: 1px solid var(--bordure); text-align: left; font-size: 13.5px; }
table.data-table th { background: var(--gris-clair); font-weight: 600; color: #444; }
table.data-table tbody tr:hover { background: #fafbfd; }
.text-right { text-align: right; }
.text-center { text-align: center; }
.empty-state { padding: 30px; text-align: center; color: var(--gris); }

/* Badges */
.badge { display: inline-block; padding: 3px 10px; border-radius: 12px; font-size: 12px; font-weight: 600; }
.badge-success { background: #e6f4ea; color: var(--vert); }
.badge-warning { background: #fef6e0; color: var(--orange); }
.badge-danger { background: #fdecea; color: var(--rouge); }
.badge-neutral { background: #eef0f3; color: var(--gris); }

/* Stats */
.stats-row { display: flex; gap: 16px; margin-bottom: 20px; flex-wrap: wrap; }
.stat-card { flex: 1; min-width: 160px; background: #fff; border: 1px solid var(--bordure); border-radius: var(--radius); padding: 16px; }
.stat-card .stat-label { font-size: 12.5px; color: var(--gris); margin-bottom: 6px; }
.stat-card .stat-value { font-size: 22px; font-weight: 700; color: var(--bleu-fonce); }

/* Login page */
.login-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, var(--bleu-fonce), var(--bleu)); }
.login-box { background: #fff; border-radius: 10px; padding: 36px; width: 360px; box-shadow: 0 10px 40px rgba(0,0,0,.25); }
.login-box h1 { margin: 0 0 4px; font-size: 20px; text-align: center; color: var(--bleu-fonce); }
.login-box .subtitle { text-align: center; color: var(--gris); margin-bottom: 24px; font-size: 13px; }
.login-box .btn { width: 100%; margin-top: 6px; padding: 10px; }

/* Schedule grid */
.schedule-table { width: 100%; border-collapse: collapse; }
.schedule-table th, .schedule-table td { border: 1px solid var(--bordure); padding: 8px; font-size: 12.5px; vertical-align: top; }
.schedule-table th { background: var(--gris-clair); }
.cours-block { background: var(--bleu-clair); border-left: 3px solid var(--bleu); border-radius: 4px; padding: 6px; margin-bottom: 4px; }
.cours-block .cours-heure { font-weight: 600; font-size: 11.5px; }

@media (max-width: 900px) {
    .form-grid, .form-grid.cols-3, .form-grid.cols-4 { grid-template-columns: 1fr; }
    .app { flex-direction: column; }
    .sidebar { width: 100%; }
}