:root {
    --color-bg: #f5f6f8;
    --color-surface: #ffffff;
    --color-border: #dde1e6;
    --color-text: #1f2430;
    --color-text-muted: #667085;
    --color-primary: #2f5eff;
    --color-primary-hover: #2447cc;
    --color-danger: #d13438;
    --radius: 8px;
}

* { box-sizing: border-box; }

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

.page-center {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px;
    max-width: 420px;
    text-align: center;
}

.button, button.button, input[type="submit"] {
    display: inline-block;
    background: var(--color-primary);
    color: #fff;
    border: none;
    padding: 10px 18px;
    border-radius: var(--radius);
    text-decoration: none;
    cursor: pointer;
    font-size: 14px;
}
.button:hover { background: var(--color-primary-hover); }
.button.danger { background: var(--color-danger); }

.topnav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 10px 20px;
    flex-wrap: wrap;
    gap: 10px;
}
.topnav-brand { font-weight: 600; }
.topnav-links a { margin-right: 16px; color: var(--color-text); text-decoration: none; }
.topnav-links a:hover { color: var(--color-primary); }
.topnav-user { display: flex; align-items: center; gap: 12px; font-size: 13px; color: var(--color-text-muted); }
.topnav-user a { color: var(--color-primary); text-decoration: none; }

.container { padding: 20px; max-width: 1100px; margin: 0 auto; }

table { width: 100%; border-collapse: collapse; background: var(--color-surface); }
th, td { padding: 8px 10px; border-bottom: 1px solid var(--color-border); text-align: left; font-size: 14px; }
th { background: #fafbfc; }

.form-row { margin-bottom: 12px; }
.form-row label { display: block; margin-bottom: 4px; font-size: 13px; color: var(--color-text-muted); }
.form-row input, .form-row select, .form-row textarea {
    width: 100%; padding: 8px; border: 1px solid var(--color-border); border-radius: 6px; font-size: 14px;
}

.alert { padding: 10px 14px; border-radius: 6px; margin-bottom: 16px; font-size: 14px; }
.alert-error { background: #fdecea; color: var(--color-danger); border: 1px solid #f5c2c0; }
.alert-success { background: #e9f7ef; color: #1e7e34; border: 1px solid #b7e4c7; }

/* Calendrier */
.cal-toolbar { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; flex-wrap: wrap; }
.cal-grid { display: grid; gap: 6px; }
.cal-grid.view-week, .cal-grid.view-day { grid-auto-rows: minmax(28px, auto); }
.cal-day-col { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: 6px; padding: 6px; }
.cal-day-header { font-weight: 600; font-size: 13px; margin-bottom: 6px; }
.cal-slot {
    background: #e8edff; border-left: 3px solid var(--color-primary);
    border-radius: 4px; padding: 4px 6px; margin-bottom: 4px; font-size: 12px; cursor: pointer;
}
.cal-slot.own { background: #e9f7ef; border-left-color: #1e7e34; }
.cal-slot.past { opacity: 0.55; }
.badge { display: inline-block; padding: 1px 6px; border-radius: 10px; font-size: 11px; background: var(--color-border); }