* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Default Theme (Purple) */
    --bg-gradient-start: #667eea;
    --bg-gradient-end: #764ba2;
    --primary-color: #667eea;
    --primary-hover: #764ba2;
    --container-bg: #ffffff;
    --text-color: #333333;
    --text-secondary: #555555;
    --text-tertiary: #666666;
    --border-color: #e2e8f0;
    --surface-bg: #f7fafc;
    --know-color: #22c55e;
    --know-hover: #16a34a;
    --learning-color: #f59e0b;
    --learning-hover: #d97706;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
}

body.theme-light {
    --bg-gradient-start: #97B22D;
    --bg-gradient-end: #89751B;
    --primary-color: #97B22D;
    --primary-hover: #89751B;
    --container-bg: #FEFCAD;
    --text-color: #2d3748;
    --text-secondary: #4a5568;
    --text-tertiary: #718096;
    --border-color: #E3DE81;
    --surface-bg: #f1ff72;
}

body.theme-dark {
    --bg-gradient-start: #2d3d0f;
    --bg-gradient-end: #1a2208;
    --primary-color: #97B22D;
    --primary-hover: #E3DE81;
    --container-bg: #1f2d0a;
    --text-color: #E3DAB2;
    --text-secondary: #E3DE81;
    --text-tertiary: #97B22D;
    --border-color: #3d4d1f;
    --surface-bg: #2a3a12;
}

body.theme-warm-light {
    --bg-gradient-start: #C6BE28;
    --bg-gradient-end: #97B22D;
    --primary-color: #E49A32;
    --primary-hover: #C6BE28;
    --container-bg: #FEFCAD;
    --text-color: #3d3d1f;
    --text-secondary: #5d5d3f;
    --text-tertiary: #7d7d5f;
    --border-color: #E3DAB2;
    --surface-bg: #faedb6;
}

body.theme-warm-dark {
    --bg-gradient-start: #2a2510;
    --bg-gradient-end: #1a1808;
    --primary-color: #E49A32;
    --primary-hover: #C6BE28;
    --container-bg: #2d2815;
    --text-color: #FEFCAD;
    --text-secondary: #E3DAB2;
    --text-tertiary: #C6BE28;
    --border-color: #4a3f1a;
    --surface-bg: #3a3220;
}

body.theme-red {
    --bg-gradient-start: #dc2626;
    --bg-gradient-end: #991b1b;
    --primary-color: #ef4444;
    --primary-hover: #dc2626;
    --container-bg: #ffffff;
    --text-color: #1f2937;
    --text-secondary: #374151;
    --text-tertiary: #4b5563;
    --border-color: #fecaca;
    --surface-bg: #fef2f2;
}

body.theme-pink {
    --bg-gradient-start: #ec4899;
    --bg-gradient-end: #be185d;
    --primary-color: #f472b6;
    --primary-hover: #ec4899;
    --container-bg: #ffffff;
    --text-color: #1f2937;
    --text-secondary: #374151;
    --text-tertiary: #4b5563;
    --border-color: #fbcfe8;
    --surface-bg: #fdf2f8;
}

body.theme-red-dark {
    --bg-gradient-start: #7f1d1d;
    --bg-gradient-end: #450a0a;
    --primary-color: #ef4444;
    --primary-hover: #f87171;
    --container-bg: #1a0505;
    --text-color: #fecaca;
    --text-secondary: #fca5a5;
    --text-tertiary: #f87171;
    --border-color: #7f1d1d;
    --surface-bg: #450a0a;
}

body.theme-pink-dark {
    --bg-gradient-start: #831843;
    --bg-gradient-end: #500724;
    --primary-color: #f472b6;
    --primary-hover: #f9a8d4;
    --container-bg: #1a050f;
    --text-color: #fce7f3;
    --text-secondary: #fbcfe8;
    --text-tertiary: #f9a8d4;
    --border-color: #831843;
    --surface-bg: #500724;
}

body.theme-black {
    --bg-gradient-start: #1f2937;
    --bg-gradient-end: #111827;
    --primary-color: #6b7280;
    --primary-hover: #9ca3af;
    --container-bg: #0f172a;
    --text-color: #f3f4f6;
    --text-secondary: #d1d5db;
    --text-tertiary: #9ca3af;
    --border-color: #374151;
    --surface-bg: #1e293b;
}

body.theme-blue {
    --bg-gradient-start: #3b82f6;
    --bg-gradient-end: #1e40af;
    --primary-color: #60a5fa;
    --primary-hover: #3b82f6;
    --container-bg: #ffffff;
    --text-color: #1f2937;
    --text-secondary: #374151;
    --text-tertiary: #4b5563;
    --border-color: #bfdbfe;
    --surface-bg: #eff6ff;
}

body.theme-blue-dark {
    --bg-gradient-start: #0c4a6e;
    --bg-gradient-end: #082f49;
    --primary-color: #38bdf8;
    --primary-hover: #0ea5e9;
    --container-bg: #0a1929;
    --text-color: #e0f2fe;
    --text-secondary: #7dd3fc;
    --text-tertiary: #38bdf8;
    --border-color: #0e7490;
    --surface-bg: #164e63;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 10px;
    transition: background 0.3s ease;
}

.container {
    background: var(--container-bg);
    border-radius: 20px;
    padding: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 1080px;
    width: 100%;
    position: relative;
    transition: background 0.3s ease;
    margin: 10px 0;
}

/* Header Row */
.header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    margin-bottom: 15px;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.header-right {
    display: flex;
    align-items: center;
}

.app-icon {
    font-size: 1.8em;
}

h1 {
    color: var(--text-color);
    font-size: 1.8em;
    margin: 0;
    transition: color 0.3s ease;
}

/* Menu Button */
.menu-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    transition: all 0.3s;
    display: flex;
    align-items: center;
}

.menu-btn:hover .hamburger-icon span {
    background: var(--primary-hover);
}

.hamburger-icon {
    display: flex;
    flex-direction: column;
    gap: 3px;
    width: 24px;
}

.hamburger-icon span {
    display: block;
    width: 100%;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
    transition: background 0.3s;
}

/* Menu Dropdown */
.menu-dropdown {
    position: absolute;
    top: 60px;
    right: 10px;
    background: var(--container-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 8px;
    min-width: 200px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    z-index: 1000;
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    text-decoration: none;
    color: var(--text-color);
    border-radius: 8px;
    transition: all 0.2s ease;
    cursor: pointer;
    background: none;
    border: none;
    width: 100%;
    text-align: left;
}

.menu-item:hover {
    background: var(--surface-bg);
}

.menu-item-button {
    font-family: inherit;
    font-size: inherit;
}

.menu-icon {
    font-size: 1.3em;
    width: 24px;
    text-align: center;
}

.menu-label {
    flex: 1;
    font-size: 1em;
    font-weight: 500;
}

/* Theme Submenu */
.theme-submenu {
    padding: 8px;
    margin-top: 4px;
    margin-bottom: 4px;
    display: grid;
    grid-template-columns: repeat(4, 32px);
    gap: 8px;
    justify-content: center;
}

.theme-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
}

.theme-btn:hover {
    transform: scale(1.1);
    border-color: var(--primary-color);
}

.theme-btn.theme-default { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.theme-btn.theme-light { background: linear-gradient(135deg, #97B22D 0%, #E3DE81 100%); }
.theme-btn.theme-dark { background: linear-gradient(135deg, #2d3d0f 0%, #97B22D 100%); }
.theme-btn.theme-warm-light { background: linear-gradient(135deg, #E49A32 0%, #FEFCAD 100%); }
.theme-btn.theme-warm-dark { background: linear-gradient(135deg, #2a2510 0%, #E49A32 100%); }
.theme-btn.theme-red { background: linear-gradient(135deg, #dc2626 0%, #991b1b 100%); }
.theme-btn.theme-pink { background: linear-gradient(135deg, #ec4899 0%, #be185d 100%); }
.theme-btn.theme-red-dark { background: linear-gradient(135deg, #7f1d1d 0%, #ef4444 100%); }
.theme-btn.theme-pink-dark { background: linear-gradient(135deg, #831843 0%, #f472b6 100%); }
.theme-btn.theme-black { background: linear-gradient(135deg, #1f2937 0%, #111827 100%); }
.theme-btn.theme-blue { background: linear-gradient(135deg, #3b82f6 0%, #1e40af 100%); }
.theme-btn.theme-blue-dark { background: linear-gradient(135deg, #0c4a6e 0%, #38bdf8 100%); }

/* Screens */
.screen {
    display: none;
}

.screen.active {
    display: block;
}

/* ===== DECK LIST SCREEN ===== */
.screen-title {
    color: var(--text-color);
    font-size: 1.2em;
    font-weight: 600;
    margin-bottom: 15px;
    transition: color 0.3s ease;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 18px;
    border: none;
    border-radius: 10px;
    font-size: 0.95em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
}

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

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

.btn-know {
    background: var(--know-color);
    color: #fff;
    flex: 1;
    padding: 14px;
    font-size: 1em;
}

.btn-know:hover {
    background: var(--know-hover);
}

.btn-learning {
    background: var(--learning-color);
    color: #fff;
    flex: 1;
    padding: 14px;
    font-size: 1em;
}

.btn-learning:hover {
    background: var(--learning-hover);
}

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

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

.btn-secondary {
    background: var(--surface-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--border-color);
}

.btn-icon {
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    font-size: 1.1em;
    transition: background 0.2s;
    color: var(--text-secondary);
}

.btn-icon:hover {
    background: var(--surface-bg);
}

.deck-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 10px;
}

.deck-item {
    display: flex;
    align-items: center;
    background: var(--surface-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 14px 16px;
    gap: 10px;
    transition: border-color 0.2s;
    margin-bottom: 10px;
}

.deck-item:hover {
    border-color: var(--primary-color);
}

.deck-info {
    flex: 1;
    min-width: 0;
}

.deck-title {
    font-weight: 600;
    color: var(--text-color);
    font-size: 1em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.deck-meta {
    font-size: 0.82em;
    color: var(--text-tertiary);
    margin-top: 2px;
}

.deck-actions {
    display: flex;
    gap: 4px;
    flex-shrink: 0;
}

.deck-menu-wrap {
    position: relative;
}

.deck-menu-btn {
    font-size: 1.3em;
    line-height: 1;
    padding: 4px 8px;
}

.deck-menu-dropdown {
    position: absolute;
    top: calc(100% + 4px);
    right: 0;
    background: var(--container-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 6px;
    min-width: 160px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
    z-index: 100;
}

.deck-menu-item {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 8px 10px;
    background: none;
    border: none;
    border-radius: 7px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.95em;
    color: var(--text-color);
    text-align: left;
    transition: background 0.15s;
}

.deck-menu-item:hover {
    background: var(--surface-bg);
}

.deck-menu-item--danger {
    color: #e05050;
}

.deck-menu-icon {
    width: 20px;
    text-align: center;
    flex-shrink: 0;
}

.empty-state {
    text-align: center;
    padding: 30px 20px;
    color: var(--text-tertiary);
}

.empty-state .empty-icon {
    font-size: 3em;
    margin-bottom: 10px;
}

.empty-state p {
    font-size: 0.95em;
}

/* ===== DECK EDITOR SCREEN ===== */
.editor-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.editor-header h2 {
    flex: 1;
    color: var(--text-color);
    font-size: 1.15em;
    font-weight: 600;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 0.85em;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-input {
    width: 100%;
    padding: 10px 14px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 0.95em;
    background: var(--container-bg);
    color: var(--text-color);
    font-family: inherit;
    transition: border-color 0.2s;
    outline: none;
}

.form-input:focus {
    border-color: var(--primary-color);
}

.cards-section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.cards-section-label {
    font-size: 0.85em;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card-editor-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding-right: 2px;
}

.card-editor-item {
    background: var(--surface-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 12px;
    position: relative;
}

.card-editor-item .card-num {
    font-size: 0.75em;
    color: var(--text-tertiary);
    font-weight: 600;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card-fields {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.card-fields .form-input {
    font-size: 0.88em;
    padding: 8px 10px;
    width: 100%;
    resize: vertical;
    min-height: 60px;
    line-height: 1.45;
}

.card-fields .form-input::placeholder {
    color: var(--text-tertiary);
}

.card-editor-remove {
    position: absolute;
    top: 8px;
    right: 8px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-tertiary);
    font-size: 1em;
    padding: 2px 4px;
    border-radius: 4px;
    transition: color 0.2s, background 0.2s;
    line-height: 1;
}

.card-editor-remove:hover {
    color: var(--danger-color);
    background: var(--surface-bg);
}

.editor-actions {
    display: flex;
    gap: 10px;
    margin-top: 16px;
}

/* ===== STUDY SCREEN ===== */
.study-progress {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.progress-text {
    font-size: 0.88em;
    color: var(--text-secondary);
    font-weight: 500;
}

.progress-bar-wrap {
    height: 5px;
    background: var(--border-color);
    border-radius: 3px;
    margin-bottom: 16px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: var(--primary-color);
    border-radius: 3px;
    transition: width 0.4s ease;
}

.flashcard-wrap {
    perspective: 1200px;
    margin-bottom: 18px;
}

.flashcard {
    width: 100%;
    min-height: 200px;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.5s ease;
    cursor: pointer;
}

.flashcard.no-transition {
    transition: none;
}

.flashcard.flipped {
    transform: rotateY(180deg);
}

.card-face {
    position: absolute;
    width: 100%;
    min-height: 200px;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 24px;
    border: 2px solid var(--border-color);
    background: var(--surface-bg);
}

.card-face-back {
    transform: rotateY(180deg);
    background: var(--container-bg);
    border-color: var(--primary-color);
}

.card-side-label {
    font-size: 0.75em;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-tertiary);
    margin-bottom: 12px;
}

.card-text {
    font-size: 1.35em;
    font-weight: 600;
    color: var(--text-color);
    text-align: center;
    line-height: 1.4;
    word-break: break-word;
    white-space: pre-wrap;
}

.card-tap-hint {
    margin-top: 14px;
    font-size: 0.8em;
    color: var(--text-tertiary);
}

.study-rating-row {
    display: flex;
    gap: 12px;
    margin-bottom: 14px;
    visibility: hidden;
}

.study-nav-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
}

.study-nav-row .btn {
    font-size: 0.85em;
    padding: 8px 14px;
}

.study-nav-row .btn:disabled {
    opacity: 0.35;
    cursor: default;
    pointer-events: none;
}

/* ===== RESULTS SCREEN ===== */
.results-content {
    text-align: center;
    padding: 10px 0;
}

.results-trophy {
    font-size: 3.5em;
    margin-bottom: 12px;
}

.results-title {
    font-size: 1.4em;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 6px;
}

.results-subtitle {
    font-size: 0.95em;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.results-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 24px;
}

.stat-box {
    background: var(--surface-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 14px 8px;
}

.stat-value {
    font-size: 1.8em;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.78em;
    color: var(--text-tertiary);
    margin-top: 4px;
    font-weight: 500;
}

.results-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* Shuffle toggle */
.shuffle-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.88em;
    color: var(--text-secondary);
    cursor: pointer;
    user-select: none;
    white-space: nowrap;
}

.shuffle-toggle input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

/* ===== CARD IMAGES ===== */

/* Image shown on flashcard face during study */
.card-image {
    max-width: 100%;
    max-height: 220px;
    object-fit: contain;
    border-radius: 8px;
    margin-bottom: 10px;
}

/* Wrapper for textarea + image upload row in the editor */
.card-field-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

/* Row below each textarea holding thumb, upload button, remove button */
.card-image-row {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    padding: 4px 0;
}

/* Thumbnail preview in the editor */
.card-thumb {
    max-height: 60px;
    max-width: 100px;
    object-fit: contain;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

/* "📷 Photo" upload label */
.btn-img-upload {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    border-radius: 8px;
    background: var(--surface-bg);
    border: 1px dashed var(--border-color);
    cursor: pointer;
    font-size: 0.82em;
    color: var(--text-secondary);
    transition: background 0.2s;
    user-select: none;
}

.btn-img-upload:hover {
    background: var(--border-color);
}

/* Remove image button in the editor */
.btn-img-remove {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--danger-color);
    font-size: 0.9em;
    padding: 2px 6px;
    border-radius: 4px;
    transition: background 0.2s;
    font-family: inherit;
}

.btn-img-remove:hover {
    background: var(--surface-bg);
}

/* Hidden file input inside the upload label */
.card-img-file-input {
    display: none;
}

/* Responsive */
@media (max-width: 480px) {
    body {
        padding: 6px;
        align-items: flex-start;
    }

    .container {
        border-radius: 16px;
        padding: 16px;
        margin: 0;
    }

    h1 {
        font-size: 1.5em;
    }

    .results-stats {
        grid-template-columns: repeat(3, 1fr);
    }

    /* On narrow screens, stack the deck title above the action buttons */
    .deck-item {
        flex-wrap: wrap;
    }

    .deck-info {
        flex-basis: 100%;
        min-width: 0;
    }

    .deck-title {
        white-space: normal;
        word-break: break-word;
    }
}

/* Desktop: flashcard centered at 80% width */
@media (min-width: 600px) {
    .flashcard-wrap {
        width: 80%;
        margin: 50px auto;
    }
}

/* ===== IMPORT MODAL ===== */

.share-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: 20px;
}

.share-modal {
    background: var(--container-bg);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    max-width: 340px;
    width: 100%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.share-modal-title {
    font-size: 1.1em;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 10px;
}

.share-modal-body {
    font-size: 0.95em;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.4;
}

.share-modal-actions {
    display: flex;
    gap: 10px;
}

/* ===== EDIT CARD MODAL ===== */

.edit-card-modal {
    max-width: 420px;
}

/* ===== IMPORT OPTIONS MODAL ===== */

.import-options-body {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 16px;
}

.import-option-btn {
    width: 100%;
    justify-content: flex-start;
    padding: 12px 16px;
    font-size: 1em;
}

/* ===== PASTE JSON MODAL ===== */

.import-paste-modal {
    max-width: 420px;
}

.import-paste-textarea {
    resize: vertical;
    min-height: 130px;
    width: 100%;
    font-family: monospace;
    font-size: 0.85em;
    line-height: 1.4;
    margin-bottom: 4px;
}

.edit-card-modal-body {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.edit-card-label {
    display: block;
    font-size: 0.82em;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

.edit-card-textarea {
    resize: vertical;
    min-height: 70px;
    font-size: 0.92em;
    line-height: 1.45;
}

/* ===== TOAST ===== */

.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(12px);
    background: var(--text-color);
    color: var(--container-bg);
    padding: 10px 20px;
    border-radius: 20px;
    font-size: 0.9em;
    font-weight: 500;
    opacity: 0;
    transition: opacity 0.25s ease, transform 0.25s ease;
    pointer-events: none;
    z-index: 3000;
    white-space: nowrap;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ===== STUDY LOG SCREEN ===== */

.study-log-item {
    background: var(--surface-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 14px 16px;
    margin-bottom: 10px;
    transition: border-color 0.2s;
}

.study-log-item:hover {
    border-color: var(--primary-color);
}

.study-log-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 4px;
}

.study-log-date {
    font-size: 0.78em;
    color: var(--text-tertiary);
    font-weight: 500;
}

.study-log-elapsed {
    font-size: 0.78em;
    color: var(--text-tertiary);
}

.study-log-deck {
    font-size: 0.97em;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 8px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.study-log-score {
    display: flex;
    align-items: baseline;
    gap: 10px;
}

.study-log-pct {
    font-size: 1.35em;
    font-weight: 700;
    line-height: 1;
}

.log-pct-perfect { color: var(--know-color); }
.log-pct-great   { color: var(--primary-color); }
.log-pct-ok      { color: var(--learning-color); }
.log-pct-low     { color: var(--danger-color); }

.study-log-fraction {
    font-size: 0.85em;
    color: var(--text-tertiary);
}

/* ===== AI DECK CREATOR SCREEN ===== */

.ai-optional {
    font-weight: 400;
    text-transform: none;
    color: var(--text-tertiary);
    letter-spacing: 0;
    font-size: 0.95em;
}

.ai-notes-textarea {
    resize: vertical;
    min-height: 110px;
    font-size: 0.92em;
    line-height: 1.45;
}

.ai-options-row {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
}

.ai-options-row .form-group {
    flex: 1;
    margin-bottom: 0;
}

.ai-model-note {
    background: var(--surface-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 10px 14px;
    font-size: 0.82em;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 16px;
}

.ai-status-area {
    padding: 16px 0;
}

.ai-status-text {
    font-size: 0.88em;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 8px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.ai-progress-wrap {
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 4px;
}

.ai-progress-fill {
    height: 100%;
    background: var(--primary-color);
    border-radius: 4px;
    transition: width 0.4s ease;
    width: 0%;
}

.ai-notes-only-label {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
    font-size: 0.88em;
    color: var(--text-secondary);
    cursor: pointer;
    user-select: none;
}

.ai-notes-only-label input[type="checkbox"] {
    width: 15px;
    height: 15px;
    flex-shrink: 0;
    accent-color: var(--primary-color);
    cursor: pointer;
}

.ai-accuracy-note {
    background: var(--surface-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 10px 14px;
    font-size: 0.82em;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-top: 16px;
    margin-bottom: 4px;
}

/* ===== TRIAL SCREEN ===== */

.trial-loading-area {
    text-align: center;
    padding: 30px 20px;
}

.trial-loading-icon {
    font-size: 3.5em;
    margin-bottom: 16px;
    display: inline-block;
    animation: trialPulse 1.6s ease-in-out infinite;
}

@keyframes trialPulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.18); opacity: 0.8; }
}

.trial-loading-text {
    font-size: 1em;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 4px;
    line-height: 1.5;
}

.trial-question-text {
    font-size: 1.15em;
    font-weight: 600;
    color: var(--text-color);
    line-height: 1.45;
    word-break: break-word;
    margin-bottom: 16px;
    padding: 16px 18px;
    background: var(--surface-bg);
    border: 1px solid var(--border-color);
    border-radius: 14px;
}

.trial-answers {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 16px;
}

.trial-answer-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 12px 16px;
    background: var(--surface-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    text-align: left;
    transition: border-color 0.2s, background 0.2s, opacity 0.2s;
    font-family: inherit;
    font-size: 0.95em;
    color: var(--text-color);
}

.trial-answer-btn:hover:not(:disabled) {
    border-color: var(--primary-color);
    background: var(--container-bg);
}

.trial-answer-btn:disabled {
    cursor: default;
}

.trial-answer-label {
    font-weight: 700;
    font-size: 0.88em;
    color: var(--primary-color);
    min-width: 20px;
    flex-shrink: 0;
    transition: color 0.2s;
}

.trial-answer-text {
    flex: 1;
    line-height: 1.4;
    word-break: break-word;
}

.trial-answer-btn.trial-answer-correct {
    background: var(--know-color);
    border-color: var(--know-color);
    color: #fff;
}

.trial-answer-btn.trial-answer-correct .trial-answer-label {
    color: #fff;
}

.trial-answer-btn.trial-answer-wrong {
    background: var(--danger-color);
    border-color: var(--danger-color);
    color: #fff;
}

.trial-answer-btn.trial-answer-wrong .trial-answer-label {
    color: #fff;
}

.trial-answer-btn.trial-answer-dim {
    opacity: 0.4;
}

.trial-feedback {
    padding: 10px 14px;
    border-radius: 10px;
    font-size: 0.92em;
    font-weight: 600;
    margin-bottom: 14px;
    line-height: 1.4;
    word-break: break-word;
}

.trial-feedback-correct {
    background: rgba(34, 197, 94, 0.15);
    border: 1px solid var(--know-color);
    color: var(--know-color);
}

.trial-feedback-wrong {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid var(--danger-color);
    color: var(--danger-color);
}

.trial-actions {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

/* ===== VIEW SOURCE SPELL MODAL ===== */

.view-spell-modal {
    max-width: 420px;
}

.view-spell-flashcard-wrap {
    perspective: 1200px;
    margin-bottom: 16px;
    min-height: 200px;
}

.view-spell-flashcard {
    width: 100%;
    min-height: 200px;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.5s ease;
    cursor: pointer;
}

.view-spell-flashcard.flipped {
    transform: rotateY(180deg);
}

/* ===== EDIT TRIAL QUESTION MODAL ===== */

.edit-trial-question-modal {
    max-width: 480px;
    max-height: 90vh;
    overflow-y: auto;
}

.edit-trial-question-body {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.edit-trial-answers-hint {
    font-size: 0.82em;
    color: var(--text-tertiary);
    margin-bottom: 4px;
}

.edit-trial-answer-row {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 6px;
}

.edit-trial-correct-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    cursor: pointer;
    padding-top: 8px;
    flex-shrink: 0;
}

.edit-trial-correct-radio {
    width: 18px;
    height: 18px;
    accent-color: var(--know-color);
    cursor: pointer;
    margin: 0;
}

.edit-trial-answer-input {
    flex: 1;
    min-height: 50px;
}