:root {
    --primary-color: #005a9c; /* Bleu institutionnel */
    --secondary-color: #e30613; /* Rouge pour accents/danger */
    --text-color: #212529;
    --text-light-color: #6c757d;
    --background-color: #f8f9fa;
    --border-color: #dee2e6;
    --white: #fff;
    --danger-color: #dc3545;
    --danger-light-color: #f8d7da;
    --success-color: #198754;
    --font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

*, *::before, *::after {
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
}

.container {
    max-width: 1024px;
    margin: 2rem auto;
    padding: 0 1rem;
}

header {
    background: var(--white);
    padding: 1rem 2rem;
    margin-bottom: 2rem;
    border-radius: 8px;
    box-shadow: var(--box-shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

header h1 {
    margin: 0;
    font-size: 1.5em;
}

header h1 a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

nav ul {
    padding: 0;
    margin: 0;
    list-style: none;
    display: flex;
    gap: 0.5rem;
}
nav ul li a {
    display: block;
    padding: 0.5rem 1rem;
    text-decoration: none;
    color: var(--text-light-color);
    border-radius: 6px;
    transition: background-color 0.2s, color 0.2s;
    font-weight: 500;
}
nav ul li a:hover, nav ul li a.active {
    background-color: var(--primary-color);
    color: var(--white);
}
nav ul li a.logout {
    background-color: var(--danger-light-color);
    color: var(--danger-color);
}
nav ul li a.logout:hover {
    background-color: var(--danger-color);
    color: var(--white);
}

main {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--box-shadow);
}

footer {
    text-align: center;
    margin-top: 2rem;
    color: #999;
    font-size: 0.9em;
}

/* --- Tables --- */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1.5rem;
}
th, td {
    padding: 12px 15px;
    border-bottom: 1px solid var(--border-color);
    text-align: left;
}
thead tr {
    border-bottom: 2px solid var(--border-color);
}
th { background-color: var(--background-color); font-weight: 600; }
td { vertical-align: middle; }

/* --- Forms --- */
form { margin-top: 1rem; }
fieldset { border: 1px solid var(--border-color); border-radius: 6px; padding: 1.5rem; margin-bottom: 1.5rem; }
legend { font-weight: 600; font-size: 1.1em; padding: 0 0.5rem; color: var(--primary-color); }
.form-group { margin-bottom: 1rem; }
.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}
.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="date"],
.form-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1em;
    font-family: var(--font-family);
    transition: border-color 0.2s, box-shadow 0.2s;
}
.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 90, 156, 0.2);
}
.form-group-checkbox {
    display: flex;
    align-items: center;
    margin-bottom: 0.5rem;
}
.form-group-checkbox input[type="checkbox"] {
    margin-right: 10px;
    width: 1.2em;
    height: 1.2em;
}

/* --- Buttons --- */
.form-actions { margin-top: 1.5rem; display: flex; gap: 1rem; }
a, button {
    text-decoration: none;
    border-radius: 6px;
    padding: 10px 20px;
    display: inline-block;
    border: 1px solid transparent;
    cursor: pointer;
    font-size: 1em;
    font-weight: 500;
    transition: all 0.2s ease-in-out;
}

button, a.button { background-color: var(--primary-color); color: var(--white); }
button:hover, a.button:hover { background-color: #004475; }

.button-edit { background-color: #6c757d; color: var(--white); }
.button-edit:hover { background-color: #5a6268; }

.button-delete { background-color: var(--danger-color); color: var(--white); }
.button-delete:hover { background-color: #c82333; }

.button-purge { background-color: #343a40; color: var(--white); }
.button-purge:hover { background-color: #23272b; }

.form-actions a { color: var(--text-light-color); background: none; border: 1px solid var(--border-color); }
.form-actions a:hover { background-color: var(--background-color); }

/* --- Calendar View --- */
.month-header {
    margin-top: 2.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
    font-weight: 300;
    font-size: 1.8em;
    color: var(--primary-color);
}
.month-header:first-of-type {
    margin-top: 0;
}

.event-item {
    display: flex;
    margin-bottom: 2px;
}
.event-item.event-deleted { opacity: 0.6; }

.event-date {
    flex: 0 0 65px;
    text-align: center;
    padding: 10px 5px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    z-index: 1;
}
.event-item.event-group-start .event-date { background-color: var(--background-color); border-radius: 6px 0 0 0; }
.event-item.event-group-end .event-date { border-radius: 0 0 0 6px; }
.event-item.event-continuation .event-date { color: var(--text-light-color); }

.event-date .day { font-size: 1.5em; font-weight: 600; color: var(--primary-color); }
.event-date .weekday { font-size: 0.8em; text-transform: uppercase; color: var(--text-light-color); }
.event-item.event-continuation .event-date .day { font-size: 1.2em; color: var(--text-light-color); }

.event-details {
    flex-grow: 1;
    padding: 0.8rem 1rem;
    border: 1px solid var(--border-color);
    border-left-width: 5px;
    background-color: var(--white);
    border-radius: 0;
}
.event-item.event-group-start .event-details { border-radius: 0 6px 0 0; }
.event-item.event-group-end .event-details { border-radius: 0 0 6px 0; }
.event-item.event-continuation { margin-top: -1px; /* Overlap borders for seamless look */ }

.event-info { display: flex; align-items: baseline; gap: 1rem; margin-bottom: 0.5rem; }
.event-title { font-weight: 600; font-size: 1.1em; }
.event-item.event-deleted .event-title { text-decoration: line-through; }
.event-period { font-style: italic; color: var(--text-light-color); }

.status-badge { display: inline-block; padding: 2px 8px; font-size: 0.8em; border-radius: 10px; color: var(--white); vertical-align: middle; }
.status-new { background-color: var(--success-color); }
.status-deleted { background-color: var(--text-light-color); }

.event-participants { display: flex; flex-wrap: wrap; gap: 0.5rem; padding-top: 0.5rem; }
.participant-initials {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.85em;
    line-height: 1.5;
}
.flash-message {
    padding: 1rem;
    margin-bottom: 1.5rem;
    border-radius: 6px;
    background-color: #d1e7dd;
    color: #0f5132;
    border: 1px solid #badbcc;
}
.view-switcher {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}
.view-switcher a {
    padding: 0.8rem 1.5rem;
    text-decoration: none;
    color: var(--text-light-color);
    border-radius: 6px 6px 0 0;
    font-weight: 500;
    position: relative;
    bottom: -1px;
    border: 1px solid transparent;
}
.view-switcher a.active {
    color: var(--primary-color);
    background-color: var(--white);
    border-color: var(--border-color);
    border-bottom-color: var(--white);
}

/* --- Calendar Grid --- */
.calendar-grid-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}
.calendar-grid-header h2 {
    margin: 0;
    font-size: 1.5em;
    font-weight: 400;
}
.calendar-grid-header a {
    font-size: 2em;
    text-decoration: none;
    color: var(--primary-color);
    padding: 0 1rem;
}
.calendar-grid {
    width: 100%;
    table-layout: fixed;
    border: 1px solid var(--border-color);
}
.calendar-grid th {
    text-align: center;
    font-weight: 600;
    padding: 0.8rem 0;
}
.calendar-grid td {
    height: 120px;
    vertical-align: top;
    padding: 4px;
    border: 1px solid var(--border-color);
}
.calendar-grid td.other-month {
    background-color: var(--background-color);
    color: #ccc;
}
.day-number {
    font-weight: 500;
    text-align: right;
}
.day-events {
    margin-top: 4px;
}
.calendar-event {
    font-size: 0.8em;
    padding: 2px 5px;
    border-radius: 4px;
    margin-bottom: 3px;
    color: var(--white);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.calendar-event.is-deleted {
    background-color: var(--text-light-color) !important; /* !important pour surcharger le style inline */
    opacity: 0.6;
    text-decoration: line-through;
}