/* ============================================================
   FLASHLEARN - Responsive CSS Stylesheet
   Mobile-First Design mit vollständigem Dark-Mode-Support
   ============================================================ */

/* ROOT VARIABLES - Light Mode (Default) */
:root {
    --primary-color: #007bff;
    --primary-color-hover: #0056b3;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;

    /* Text Farben */
    --text-primary: #343a40;
    --text-secondary: #5f6368;
    --text-muted: #8a8d93;
    --text-on-primary: #ffffff;

    /* Hintergrund Farben */
    --bg-body: #f8f9fa;
    --bg-surface: #ffffff;
    --bg-surface-alt: #f8f9fa;
    --bg-hover: rgba(0, 0, 0, 0.03);

    /* Rahmen & Trennlinien */
    --border-color: #e9ecef;
    --input-border: #dddddd;
    --input-bg: #ffffff;

    --border-radius: 8px;
    --transition: all 0.3s ease;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
}

/* DARK MODE - Überschreibt alle relevanten Variablen */
body.dark-mode {
    --primary-color: #4d9fff;
    --primary-color-hover: #6cb0ff;
    --success-color: #34c759;
    --danger-color: #ff5c5c;
    --warning-color: #ffcc33;
    --info-color: #3ec9e0;

    --text-primary: #eceef0;
    --text-secondary: #b8bcc2;
    --text-muted: #8a8f96;
    --text-on-primary: #ffffff;

    --bg-body: #16181c;
    --bg-surface: #22262b;
    --bg-surface-alt: #2a2f35;
    --bg-hover: rgba(255, 255, 255, 0.05);

    --border-color: #383d44;
    --input-border: #454b52;
    --input-bg: #2a2f35;

    --shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
}

/* RESET & BASE STYLES */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-body);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* TYPOGRAPHY */
h1 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

small {
    display: block;
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

/* NAVIGATION BAR */
.navbar {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-color-hover) 100%);
    color: var(--text-on-primary);
    padding: 1rem 0;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    white-space: nowrap;
    color: var(--text-on-primary);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.nav-link {
    color: var(--text-on-primary);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    font-size: 0.95rem;
    cursor: pointer;
    white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
    background: rgba(255, 255, 255, 0.2);
}

/* MAIN CONTENT */
.main-content {
    min-height: calc(100vh - 70px);
    padding: 2rem 1rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.view {
    display: none;
    animation: fadeIn 0.3s ease;
}

.view.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* GRID SYSTEMS */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg-surface);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: var(--transition);
}

.stat-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.stat-icon {
    font-size: 2rem;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.decks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.deck-card {
    background: var(--bg-surface);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: var(--transition);
    border-left: 4px solid var(--primary-color);
}

.deck-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.deck-card-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 1rem;
}

.deck-card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.deck-card-badge {
    background: var(--info-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.deck-card-stats {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.deck-card-stat {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.deck-card-progress {
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    overflow: hidden;
}

.deck-card-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--success-color), var(--info-color));
    transition: var(--transition);
}

/* BUTTONS */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
    display: inline-block;
    text-decoration: none;
    text-align: center;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-color-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 123, 255, 0.3);
}

.btn-success {
    background: var(--success-color);
    color: white;
}

.btn-success:hover {
    filter: brightness(0.9);
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    filter: brightness(0.9);
}

.btn-warning {
    background: var(--warning-color);
    color: #333;
}

.btn-warning:hover {
    filter: brightness(0.95);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-block {
    width: 100%;
}

/* FORMS */
.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="file"],
textarea,
select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--input-border);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
    background-color: var(--input-bg);
    color: var(--text-primary);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.15);
}

input::placeholder,
textarea::placeholder {
    color: var(--text-muted);
}

textarea {
    resize: vertical;
    min-height: 100px;
}

select {
    color-scheme: light;
}

body.dark-mode select {
    color-scheme: dark;
}

.checkbox-group {
    margin-bottom: 1rem;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    margin-right: 0.5rem;
    cursor: pointer;
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.form-actions .btn {
    flex: 1;
    min-width: 150px;
}

.divider {
    text-align: center;
    margin: 2rem 0 1rem;
    color: var(--text-muted);
    font-weight: 600;
    position: relative;
}

.divider::before,
.divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 45%;
    height: 1px;
    background: var(--border-color);
}

.divider::before {
    left: 0;
}

.divider::after {
    right: 0;
}

/* LEARNING CARD */
.learn-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.learn-header h1 {
    margin-bottom: 0;
}

.learn-stats {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
}

.progress-container {
    width: 100%;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    margin-bottom: 2rem;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--success-color));
    width: 0%;
    transition: width 0.3s ease;
}

.card-container {
    perspective: 1000px;
    margin-bottom: 2rem;
}

.flashcard {
    background: var(--bg-surface);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.card-content {
    width: 100%;
    padding: 3rem 2rem;
    text-align: center;
    transition: var(--transition);
}

.card-side {
    min-height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.card-side p {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin: 0;
}

.card-side small {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 1rem;
}

.card-side.back p {
    color: var(--primary-color);
}

.card-side.hidden {
    display: none;
}

.card-image-container {
    text-align: center;
    margin-bottom: 1rem;
}

.card-image-container img {
    max-width: 100%;
    max-height: 300px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.card-image-container.hidden {
    display: none;
}

/* ANSWER BUTTONS */
.answer-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    justify-content: center;
}

.answer-buttons .btn {
    flex: 1;
    min-width: 120px;
    padding: 1rem;
    font-size: 1rem;
}

.keyboard-hint {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: 1rem;
    padding: 1rem;
    background: var(--bg-surface-alt);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.session-stats {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 2rem;
    padding: 1rem;
    background: var(--bg-surface);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.stat-mini {
    text-align: center;
}

.stat-mini .label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.stat-mini .value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* TABS */
.tabs {
    display: flex;
    gap: 0;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 2rem;
}

.tab-btn {
    background: none;
    border: none;
    padding: 1rem 1.5rem;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 3px solid transparent;
    transition: var(--transition);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* PREVIEW BOX */
.preview-box {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.preview-box.hidden {
    display: none;
}

.preview-box h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.preview-card {
    background: var(--bg-surface-alt);
    color: var(--text-primary);
    padding: 1rem;
    margin-bottom: 1rem;
    border-left: 3px solid var(--info-color);
    border-radius: 4px;
}

.preview-card strong {
    color: var(--text-primary);
}

/* CARD FORM */
#cards-container {
    margin-bottom: 2rem;
}

.card-form-group {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
    position: relative;
}

.card-form-group.error {
    border-color: var(--danger-color);
    background: rgba(220, 53, 69, 0.05);
}

.card-form-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.card-form-number {
    font-weight: 700;
    color: var(--primary-color);
}

.card-remove-btn {
    background: var(--danger-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.875rem;
}

.card-remove-btn:hover {
    filter: brightness(0.9);
}

.card-image-upload {
    border: 2px dashed var(--input-border);
    border-radius: var(--border-radius);
    padding: 1rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
}

.card-image-upload:hover {
    border-color: var(--primary-color);
    background: var(--bg-hover);
}

.card-image-preview {
    max-width: 150px;
    max-height: 150px;
    margin-top: 1rem;
    border-radius: 4px;
}

/* MODAL */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s ease;
}

.modal.show {
    display: block;
}

.modal-content {
    background-color: var(--bg-surface);
    color: var(--text-primary);
    margin: 10% auto;
    padding: 2rem;
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
    border: 1px solid var(--border-color);
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.close {
    color: var(--text-muted);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    line-height: 20px;
}

.close:hover {
    color: var(--text-primary);
}

#modal-deck-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

#modal-deck-actions .btn {
    flex: 1;
    min-width: 100px;
}

/* TOAST NOTIFICATIONS */
.toast-container {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 2000;
}

.toast {
    background: var(--bg-surface);
    color: var(--text-primary);
    padding: 1rem 1.5rem;
    margin-bottom: 1rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    min-width: 300px;
    animation: slideInRight 0.3s ease;
    border-left: 4px solid var(--info-color);
    border-top: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

@keyframes slideInRight {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast.success {
    border-left-color: var(--success-color);
}

.toast.error {
    border-left-color: var(--danger-color);
}

.toast.warning {
    border-left-color: var(--warning-color);
}

/* SECTION */
.section {
    margin-bottom: 3rem;
}

.section h2 {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.activity-list {
    background: var(--bg-surface);
    border-radius: var(--border-radius);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.activity-item {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.activity-item:last-child {
    border-bottom: none;
}

.activity-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.activity-time {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* SHARING */
.share-section {
    background: var(--bg-surface);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.share-section h2 {
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 1rem;
}

.share-deck-item {
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.share-deck-info {
    flex: 1;
    color: var(--text-primary);
}

.share-deck-actions {
    display: flex;
    gap: 0.5rem;
}

/* PROFILE */
.profile-section {
    background: var(--bg-surface);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.profile-section h2 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

#user-stats-detailed {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.stat-detail {
    text-align: center;
    padding: 1rem;
    background: var(--bg-surface-alt);
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.stat-detail-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-detail-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

/* RESPONSIVE DESIGN */
@media (max-width: 768px) {
    h1 {
        font-size: 1.5rem;
    }

    h2 {
        font-size: 1.25rem;
    }

    .navbar {
        padding: 0.75rem 0;
    }

    .nav-container {
        flex-direction: column;
        gap: 0.5rem;
    }

    .nav-menu {
        gap: 0.25rem;
    }

    .nav-link {
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .decks-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }

    .flashcard {
        min-height: 250px;
    }

    .card-content {
        padding: 2rem 1rem;
    }

    .card-side p {
        font-size: 1.25rem;
    }

    .answer-buttons {
        flex-direction: column;
    }

    .answer-buttons .btn {
        width: 100%;
    }

    .session-stats {
        flex-direction: column;
        gap: 1rem;
    }

    .modal-content {
        margin: 20% auto;
        width: 95%;
    }

    .toast-container {
        right: 10px;
        left: 10px;
    }

    .toast {
        min-width: auto;
    }

    .tabs {
        flex-wrap: wrap;
    }

    .tab-btn {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
    }

    .form-actions {
        flex-direction: column;
    }

    .form-actions .btn {
        width: 100%;
    }

    .learn-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .session-stats {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .stat-mini {
        flex: 1;
        min-width: 100px;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: 1rem 0.75rem;
    }

    h1 {
        font-size: 1.25rem;
        margin-bottom: 1rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .decks-grid {
        grid-template-columns: 1fr;
    }

    .stat-card {
        flex-direction: column;
        text-align: center;
    }

    .navbar {
        padding: 0.5rem 0;
    }

    .nav-menu {
        gap: 0.1rem;
    }

    .nav-link {
        padding: 0.4rem 0.5rem;
        font-size: 0.75rem;
    }

    .card-content {
        padding: 1.5rem 1rem;
    }

    .card-side p {
        font-size: 1rem;
    }

    .flashcard {
        min-height: 200px;
    }

    .answer-buttons {
        gap: 0.5rem;
    }

    .answer-buttons .btn {
        padding: 0.75rem;
        font-size: 0.9rem;
    }

    .tabs {
        overflow-x: auto;
    }

    .tab-btn {
        padding: 0.75rem;
        font-size: 0.85rem;
        white-space: nowrap;
    }

    .form-group {
        margin-bottom: 1rem;
    }

    label {
        font-size: 0.95rem;
    }

    input,
    textarea,
    select {
        font-size: 16px; /* Prevents zoom on iOS */
    }

    #modal-deck-actions {
        flex-direction: column;
    }

    #modal-deck-actions .btn {
        width: 100%;
    }

    .share-deck-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .share-deck-actions {
        width: 100%;
        margin-top: 1rem;
    }
}

/* PRINT STYLES */
@media print {
    .navbar,
    .answer-buttons,
    .keyboard-hint,
    .session-stats,
    .btn {
        display: none;
    }

    .main-content {
        padding: 0;
    }

    .flashcard {
        page-break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ddd;
    }
}

/* ACCESSIBILITY */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* UTILITY CLASSES */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.text-muted {
    color: var(--text-muted);
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }

/* ============================================================
   Backend-first Ergänzungen: Uploadstatus, Sharing, Modal Actions
   ============================================================ */
.deck-description {
    margin-bottom: 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.deck-card-source {
    margin-top: -0.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-muted);
}

.share-decks-grid {
    margin-bottom: 0;
}

.card-image-upload .upload-state {
    margin-top: 0.35rem;
    font-size: 0.8rem;
}

#modal-deck-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.25rem;
}

#modal-deck-actions .btn {
    margin: 0;
}

.btn:disabled {
    opacity: 0.65;
    cursor: not-allowed;
    transform: none !important;
}

.toast.error {
    background: var(--danger-color);
    color: #fff;
}

.toast.warning {
    background: var(--warning-color);
    color: #222;
}

.toast.success {
    background: var(--success-color);
    color: #fff;
}

.toast.info {
    background: var(--info-color);
    color: #fff;
}