:root {
    --primary-color: #003366; /* Dunkelblau it@m */
    --secondary-color: #004d99; /* Helleres Blau */
    --accent-color: #ffffff; /* Verlauf Start */
    --accent-color-dark: #0b1de0; /* Verlauf Ende */
    --text-color: #333;
    --light-text-color: #666;
    --bg-light: #f5f7fa;
    --bg-dark: #e8ecf0;
    --border-color: #e0e4e8;
    --bg-surface: #ffffff; /* Haupt-Hintergrund (Container, Karten etc.) */
    
    --shadow-light: rgba(0,0,0,0.08);
    --shadow-medium: rgba(0,0,0,0.12);
    --shadow-dark: rgba(0,0,0,0.2);
    
    --success-bg: #d4edda;
    --success-text: #155724;
    --error-bg: #f8d7da;
    --error-text: #721c24;
    --delete-color: #dc3545;
    
    --status-neu: #007bff;
    --status-bearbeitung: #ffc107;
    --status-erledigt: #28a745;
    --status-abgelehnt: #6c757d;

    --prio-hoch: #dc3545;
    --prio-normal: #007bff;
    --prio-niedrig: #6c757d;
}

body.dark-mode {
    --text-color: #f1f1f1;
    --light-text-color: #aaa;
    --bg-light: #2c3038; /* Dunkler Hintergrund */
    --bg-dark: #373c46;  /* Dunklerer Hintergrund */
    --border-color: #4a505c;
    --bg-surface: #24272e; /* Dunkler Oberflächen-Hintergrund */

    --shadow-light: rgba(0,0,0,0.2);
    --shadow-medium: rgba(0,0,0,0.3);
    --shadow-dark: rgba(0,0,0,0.4);

    --success-bg: #2a4a34;
    --success-text: #a8dbb8;
    --error-bg: #5a2c32;
    --error-text: #f5c6cb;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body {
    font-family: sans-serif;
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-color-dark) 100%);
    min-height: 100vh;
    padding: 2rem 1rem;
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: background 0.3s ease, color 0.3s ease;
}
.container {
    max-width: 960px;
    width: 100%;
    margin: 0 auto;
    background: var(--bg-surface);
    border-radius: 16px;
    box-shadow: 0 15px 50px var(--shadow-dark);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    min-height: 80vh;
    transition: background 0.3s ease;
}
header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 2.5rem;
    text-align: center;
    position: relative;
    overflow: hidden; /* Für das Bild */
}
header h1 {
    font-size: 2.2rem;
    margin-bottom: 0.75rem;
    font-weight: 700;
}
header p {
    font-size: 1rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}
.header-image {
    position: absolute;
    bottom: -20px;
    right: -50px;
    opacity: 0.2;
    width: 300px; /* Größe anpassen */
    height: auto;
    pointer-events: none;
    user-select: none;
    filter: grayscale(100%) brightness(150%);
    z-index: 0;
}

.mode-selector {
    display: flex;
    background: var(--bg-light);
    border-bottom: 2px solid var(--border-color);
    position: relative;
    z-index: 1;
}
.mode-btn {
    flex: 1;
    padding: 1.2rem;
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--light-text-color);
    transition: all 0.3s ease;
    position: relative;
}
.mode-btn.active {
    color: var(--primary-color);
    background: var(--bg-surface);
}
.mode-btn:hover:not(.active) {
    background: var(--bg-dark);
}
.mode-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 4px;
    background-color: var(--primary-color);
    border-radius: 2px 2px 0 0;
    animation: border-fade-in 0.3s forwards;
}
@keyframes border-fade-in {
    from { transform: scaleX(0); }
    to { transform: scaleX(1); }
}

main {
    padding: 2.5rem;
    flex-grow: 1;
}
.view {
    display: none;
    animation: fadeIn 0.5s ease-out;
}
.view.active {
    display: block;
}

/* Dashboard & Charts */
.dashboard {
    background: var(--bg-light);
    border-radius: 12px;
    margin-bottom: 2rem;
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 15px var(--shadow-light);
}
.dashboard-header {
    background: var(--primary-color);
    color: white;
    padding: 1.2rem 1.8rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
    font-weight: 600;
    transition: background 0.3s ease;
}
.dashboard-header:hover {
    background: var(--secondary-color);
}
.dashboard-toggle {
    font-size: 1.3rem;
    transition: transform 0.3s ease;
}
.dashboard-toggle.collapsed {
    transform: rotate(-90deg);
}

/* Neuer Wrapper für Dashboard-Body (KPIs + Charts) */
.dashboard-body {
    transition: max-height 0.5s ease-out, opacity 0.5s ease-out;
    max-height: 2000px; /* Ausreichend Höhe */
    overflow: hidden;
}
.dashboard-body.hidden {
    max-height: 0;
    opacity: 0;
}

.dashboard-content {
    padding: 1.8rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.5rem;
}
.stat-card {
    background: var(--bg-surface);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 4px 12px var(--shadow-light);
    text-align: center;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 16px var(--shadow-medium);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}
/* Status-spezifische Farben für Dashboard */
#statGesamt { color: var(--primary-color); }
#statNeu { color: var(--status-neu); }
#statInBearbeitung { color: var(--status-bearbeitung); }
#statErledigt { color: var(--status-erledigt); }
#statAbgelehnt { color: var(--status-abgelehnt); }

.stat-label {
    color: var(--light-text-color);
    font-size: 0.95rem;
    font-weight: 500;
}

.chart-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    padding: 0 1.8rem 1.8rem 1.8rem;
}
.chart-wrapper {
    background: var(--bg-surface);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}
.chart-wrapper h3 {
    text-align: center;
    margin-bottom: 1rem;
    font-size: 1.1rem;
    color: var(--text-color);
}

/* Filter Section */
.filter-section {
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 10px var(--shadow-light);
}
.filter-section h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.4rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}
.filter-controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    align-items: flex-end;
}
.filter-group {
    min-width: 0; /* Überschreibt alten Wert */
}
.filter-group label {
    display: block;
    margin-bottom: 0.6rem;
    font-weight: 600;
    color: var(--text-color);
    font-size: 0.95rem;
}
.filter-group select,
.filter-group input[type="date"] {
    width: 100%;
    padding: 0.75rem;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    background: var(--bg-surface);
    font-size: 0.95rem;
    color: var(--text-color);
    transition: border-color 0.3s ease;
}
.filter-group select:focus,
.filter-group input[type="date"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 51, 102, 0.2);
}
.filter-buttons {
    display: flex;
    gap: 0.8rem;
    margin-top: 1rem;
    flex-wrap: wrap;
    grid-column: 1 / -1; /* Nimmt volle Breite ein */
}
.btn-filter {
    padding: 0.8rem 1.5rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.2s ease;
    flex-shrink: 0;
}
.btn-filter:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-light);
}
.btn-reset {
    background: #6c757d;
}
.btn-reset:hover {
    background: #5a6268;
}
.btn-today {
    background: #17a2b8;
}
.btn-today:hover {
    background: #138496;
}

/* Form elements */
.form-row {
    display: flex;
    gap: 1.5rem;
}
.form-group {
    flex: 1;
}
label {
    display: block;
    margin-top: 1.5rem;
    margin-bottom: 0.6rem;
    font-weight: 600;
    color: var(--text-color);
    font-size: 0.95rem;
}
input[type="text"], 
input[type="email"], 
input[type="password"], 
textarea, 
select {
    width: 100%;
    padding: 0.9rem;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    color: var(--text-color);
    background: var(--bg-surface);
}
input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 51, 102, 0.2);
}
textarea {
    resize: vertical;
    min-height: 150px;
}
.char-counter {
    text-align: right;
    font-size: 0.85rem;
    color: var(--light-text-color);
    margin-top: 0.3rem;
}

/* Strukturierte Select-Optionen */
select optgroup {
    font-weight: 600;
    font-style: normal;
    color: var(--primary-color);
    background: var(--bg-light);
    padding: 0.5rem 0.75rem;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}
select option {
    padding: 0.75rem;
    font-weight: normal;
    background: var(--bg-surface);
    color: var(--text-color);
}

.checkbox-container {
    display: flex;
    align-items: center;
    margin-top: 1.5rem;
    gap: 0.8rem;
}
input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    accent-color: var(--primary-color);
}
.checkbox-container label {
    margin: 0;
    cursor: pointer;
    font-weight: 500;
    color: var(--light-text-color);
}
button[type="submit"], .btn-action {
    margin-top: 2rem;
    padding: 1rem 2rem;
    border: none;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    cursor: pointer;
    border-radius: 8px;
    font-size: 1.05rem;
    font-weight: 600;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 5px 20px rgba(0,51,102,0.2);
}
button[type="submit"]:hover, .btn-action:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0,51,102,0.3);
}
button[type="submit"]:active, .btn-action:active {
    transform: translateY(0);
    box-shadow: 0 5px 20px rgba(0,51,102,0.2);
}
.btn-secondary {
    background: linear-gradient(135deg, #6c757d 0%, #5a6268 100%);
    margin-left: 0.8rem;
    box-shadow: 0 5px 20px rgba(108,117,125,0.2);
}
.btn-secondary:hover {
    box-shadow: 0 8px 25px rgba(108,117,125,0.3);
}

/* Feedback List */
.date-group {
    margin-bottom: 1rem; /* Verringert, da Items einklappbar sind */
}
.date-header {
    background: var(--primary-color);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 10px;
    margin-bottom: 1.5rem;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 5px 15px var(--shadow-light);
    cursor: pointer;
    user-select: none;
    position: relative;
}
.date-group-toggle {
    font-size: 1.3rem;
    transition: transform 0.3s ease;
    position: absolute;
    right: 1.5rem;
}
.date-group-toggle.collapsed {
    transform: rotate(-90deg);
}
.feedback-count {
    background: rgba(255,255,255,0.25);
    padding: 0.4rem 1rem;
    border-radius: 16px;
    font-size: 0.9rem;
    font-weight: 500;
    margin-left: auto;
    margin-right: 3rem; /* Platz für den Toggle-Pfeil */
}
.date-group-content {
    transition: max-height 0.4s ease-out;
    max-height: 5000px; /* Ausreichend Höhe */
    overflow: hidden;
}
.date-group-content.hidden {
    max-height: 0;
    margin-bottom: 0;
}

.feedback-item {
    background: var(--bg-surface);
    padding: 1.5rem;
    margin-bottom: 1.2rem;
    border-radius: 12px;
    border-left: 5px solid var(--primary-color);
    box-shadow: 0 3px 10px var(--shadow-light);
    transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.3s ease;
    position: relative;
}
.feedback-item:hover {
    transform: translateX(6px);
    box-shadow: 0 6px 20px var(--shadow-medium);
}
/* Status-spezifische Stile */
.feedback-item[data-status="Neu"] { border-left-color: var(--status-neu); }
.feedback-item[data-status="In Bearbeitung"] { border-left-color: var(--status-bearbeitung); }
.feedback-item[data-status="Erledigt"] { border-left-color: var(--status-erledigt); opacity: 0.7; }
.feedback-item[data-status="Abgelehnt"] { border-left-color: var(--status-abgelehnt); opacity: 0.6; }

.feedback-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.8rem;
}
.feedback-item h3 {
    color: var(--primary-color);
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
}
.feedback-day-index {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--light-text-color);
}

.feedback-header-details {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin-bottom: 1rem;
}
.feedback-item .category-badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    background: var(--bg-dark);
    border-radius: 16px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0;
}

.feedback-item p {
    margin-bottom: 0.8rem;
    line-height: 1.7;
    color: var(--text-color);
}

/* Admin-Tools im Feedback-Item */
.admin-notes {
    width: 100%;
    min-height: 80px;
    background: var(--bg-light);
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 0.8rem;
    margin-top: 1rem;
}
.admin-notes:focus {
    background: var(--bg-surface);
}
.feedback-meta {
    font-size: 0.85rem;
    color: var(--light-text-color);
    margin-top: 1.2rem;
    padding-top: 1.2rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    flex-wrap: wrap;
    gap: 1rem;
}
.feedback-info {
    flex: 1;
    min-width: 200px;
}
.feedback-actions {
    display: flex;
    gap: 0.8rem;
    align-items: center;
    flex-wrap: wrap;
}
.feedback-status-select, .feedback-priority-select {
    padding: 0.6rem;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    background: var(--bg-surface);
    color: var(--text-color);
    font-weight: 600;
}
/* Prio-spezifische Farben für Select */
.feedback-priority-select[data-priority="Hoch"] { border-color: var(--prio-hoch); color: var(--prio-hoch); }
.feedback-priority-select[data-priority="Normal"] { border-color: var(--prio-normal); color: var(--prio-normal); }
.feedback-priority-select[data-priority="Niedrig"] { border-color: var(--prio-niedrig); color: var(--prio-niedrig); }

.btn-copy {
    background: #17a2b8;
    color: white;
    padding: 0.6rem 1.2rem;
    margin: 0;
    font-size: 0.9rem;
    border-radius: 8px;
    transition: background 0.2s ease, transform 0.2s ease;
}
.btn-copy:hover {
    background: #138496;
    transform: translateY(-2px);
}
.btn-delete {
    background: var(--delete-color);
    color: white;
    padding: 0.6rem 1.2rem;
    margin: 0;
    font-size: 0.9rem;
    border-radius: 8px;
    transition: background 0.2s ease, transform 0.2s ease;
    box-shadow: 0 3px 10px rgba(220,53,69,0.2);
}
.btn-delete:hover {
    background: #c82333;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(220,53,69,0.3);
}

footer {
    text-align: center;
    padding: 1.8rem;
    background: var(--bg-light);
    color: var(--light-text-color);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}
.dark-mode-toggle {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    cursor: pointer;
}
.dark-mode-toggle label {
    margin: 0;
    font-weight: 500;
    color: var(--light-text-color);
    cursor: pointer;
}
/* Fancy Toggle Switch CSS */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 28px;
}
.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}
.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 28px;
}
.slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}
input:checked + .slider {
    background-color: var(--primary-color);
}
input:checked + .slider:before {
    transform: translateX(22px);
}

.success-message, .error-message {
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    display: none; /* WICHTIG: Standardmäßig ausgeblendet */
    font-weight: 500;
    animation: fadeIn 0.5s ease;
    align-items: center;
    gap: 0.8rem;
}

.empty-state {
    text-align: center;
    padding: 4rem 1rem;
    color: var(--light-text-color);
    background: var(--bg-light);
    border-radius: 12px;
    border: 1px dashed var(--border-color);
}
.empty-state svg {
    width: 90px;
    height: 90px;
    margin-bottom: 1.5rem;
    opacity: 0.3;
    color: var(--primary-color);
}
.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: 0.8rem;
    color: var(--text-color);
}
.empty-state p {
    font-size: 1rem;
    max-width: 400px;
    margin: 0 auto;
}

/* Password Section */
.password-form {
    max-width: 450px;
    margin: 3rem auto;
    text-align: center;
    padding: 2.5rem;
    background: var(--bg-light);
    border-radius: 12px;
    box-shadow: 0 8px 30px var(--shadow-light);
    border: 1px solid var(--border-color);
}
.password-form h2 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}
.password-form p {
    margin-bottom: 2rem;
    color: var(--light-text-color);
    font-size: 1rem;
}
.password-form label {
    text-align: left;
    margin-top: 0;
    margin-bottom: 0.8rem;
}
.password-form input {
    margin-bottom: 1.5rem;
}
.password-form button {
    width: 100%;
    margin-top: 0;
    padding: 1rem;
    font-size: 1.1rem;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.6);
    animation: fadeIn 0.3s forwards;
}
.modal.active {
    display: flex;
    justify-content: center;
    align-items: center;
}
.modal-content {
    background: var(--bg-surface);
    padding: 2.5rem;
    border-radius: 12px;
    max-width: 450px;
    width: 90%;
    box-shadow: 0 15px 50px var(--shadow-dark);
    animation: slideIn 0.3s forwards;
}
.modal-header {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--delete-color);
    margin-bottom: 1.2rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}
.modal-body {
    color: var(--text-color);
    margin-bottom: 2rem;
    line-height: 1.7;
    font-size: 1rem;
}
.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}
.btn-modal {
    padding: 0.8rem 1.8rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    margin: 0;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}
.btn-cancel {
    background: #6c757d;
    color: white;
}
.btn-cancel:hover {
    background: #5a6268;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}
.btn-confirm {
    background: var(--delete-color);
    color: white;
}
.btn-confirm:hover {
    background: #c82333;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(220,53,69,0.2);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
@keyframes slideIn {
    from { transform: translateY(-40px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.8rem;
    }
    header p {
        font-size: 0.9rem;
    }
    main {
        padding: 1.5rem;
    }
    .dashboard-content, .filter-controls, .chart-container, .form-row {
        grid-template-columns: 1fr;
        flex-direction: column;
    }
    .filter-group {
        min-width: unset;
    }
    .filter-buttons {
        flex-direction: column;
        gap: 0.8rem;
    }
    .btn-filter, .btn-secondary {
        width: 100%;
        margin-left: 0 !important;
    }
    .feedback-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.8rem;
    }
    .feedback-actions {
        width: 100%;
        flex-direction: column;
        align-items: stretch;
    }
    .feedback-status-select, .feedback-priority-select, .btn-copy, .btn-delete {
        width: 100%;
    }
    .header-image {
        width: 200px;
        bottom: -10px;
        right: -20px;
    }
    footer {
        flex-direction: column;
        justify-content: center;
        gap: 1.5rem;
    }
}