:root {
    /* Helles Design (Standard) */
    --bg-color: #f4f6f9;
    --card-bg: #ffffff;
    --text-color: #212529;
    --muted-color: #6c757d;
    --border-color: #dee2e6;
    --input-bg: #ffffff;
    --input-border: #ced4da;
}

[data-bs-theme="dark"] {
    /* Dunkles Design */
    --bg-color: #212529;
    --card-bg: #2b3035;
    --text-color: #f8f9fa;
    --muted-color: #adb5bd;
    --border-color: #495057;
    --input-bg: #212529;
    --input-border: #495057;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

/* --- CARDS & CONTAINER --- */
.card {
    border: none;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    background-color: var(--card-bg);
    color: var(--text-color);
}

.card-header {
    background-color: rgba(0,0,0,0.03);
    border-bottom: 1px solid var(--border-color);
}

/* --- ACCORDION (Ausklappbare Listen) --- */
.accordion-item {
    background-color: var(--card-bg);
    border-color: var(--border-color);
    color: var(--text-color);
}

.accordion-button {
    background-color: var(--card-bg);
    color: var(--text-color);
    box-shadow: none !important;
}

.accordion-button:not(.collapsed) {
    background-color: rgba(13, 110, 253, 0.1);
    color: #0d6efd; 
}

/* Darkmode spezifische Accordion Fixes */
[data-bs-theme="dark"] .accordion-button {
    background-color: #343a40;
    color: #fff;
}
[data-bs-theme="dark"] .accordion-button:not(.collapsed) {
    background-color: #0d6efd;
    color: #fff;
}
[data-bs-theme="dark"] .accordion-body {
    background-color: #2b3035;
}

/* --- LIST GROUP (User View in Accordion) --- */
.list-group-item {
    background-color: var(--card-bg);
    color: var(--text-color);
    border-color: var(--border-color);
}

/* --- TABELLEN (Admin View) --- */
.table {
    color: var(--text-color);
    margin-bottom: 0;
}
[data-bs-theme="dark"] .table-light {
    background-color: #343a40;
    color: #fff;
}
[data-bs-theme="dark"] .table-hover tbody tr:hover {
    color: #fff;
    background-color: rgba(255,255,255,0.05);
}

/* --- FORMULARE & MODALS --- */
.form-control {
    background-color: var(--input-bg);
    border-color: var(--input-border);
    color: var(--text-color);
}
.form-control:focus {
    background-color: var(--input-bg);
    color: var(--text-color);
}

.modal-content {
    background-color: var(--card-bg);
    color: var(--text-color);
}
.modal-header, .modal-footer {
    border-color: var(--border-color);
}
.btn-close {
    filter: var(--btn-close-filter, none);
}
[data-bs-theme="dark"] .btn-close {
    filter: invert(1) grayscale(100%) brightness(200%);
}

/* --- STATUS FARBEN --- */
.booked {
    background-color: #ffebee;
    color: #c62828;
    border-left: 5px solid #c62828;
}
.free {
    background-color: #e8f5e9;
    color: #2e7d32;
    border-left: 5px solid #2e7d32;
}

[data-bs-theme="dark"] .booked {
    background-color: #581c1c;
    color: #ffcdd2;
    border-left-color: #ff5252;
}
[data-bs-theme="dark"] .free {
    background-color: #1b4d24;
    color: #c8e6c9;
    border-left-color: #66bb6a;
}

/* --- NAVIGATION & LOADER --- */
.navbar-brand {
    font-weight: bold;
    font-size: 1.2rem;
}

/* Lade-Hinweise dauerhaft ausblenden.
   Wir nutzen !important, um das JavaScript (style="display:block") zu überschreiben.
   Betrifft: #loader (Admin) und #loader-container (User)
*/
#loader,
#loader-container {
    display: none !important;
    visibility: hidden !important;
    opacity: 0 !important;
    animation: none !important;
    height: 0;
    width: 0;
    overflow: hidden;
}