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

:root {
    --primary-color: #2563EB;
    --primary-dark: #1D4ED8;
    --primary-light: #3B82F6;
    --primary-hover: #1D4ED8;
    --secondary-color: #64748B;
    --success-color: #10B981;
    --warning-color: #F59E0B;
    --danger-color: #EF4444;
    --background-color: #F8FAFC;
    --card-background: #FFFFFF;
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --text-muted: #94A3B8;
    --border-color: #E2E8F0;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-glow: 0 0 20px rgba(37, 99, 235, 0.15);
    --shadow-success: 0 0 20px rgba(16, 185, 129, 0.2);
    --shadow-danger: 0 0 20px rgba(239, 68, 68, 0.2);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --gradient-primary: linear-gradient(135deg, #2563EB 0%, #3B82F6 100%);
    --gradient-success: linear-gradient(135deg, #10B981 0%, #34D399 100%);
    --gradient-danger: linear-gradient(135deg, #EF4444 0%, #F87171 100%);
    --gradient-card: linear-gradient(145deg, #FFFFFF 0%, #F8FAFC 100%);
    --backdrop-blur: blur(12px);
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

[data-theme="dark"] {
    --primary-color: #3B82F6;
    --primary-dark: #2563EB;
    --primary-light: #60A5FA;
    --primary-hover: #2563EB;
    --secondary-color: #94A3B8;
    --success-color: #34D399;
    --warning-color: #FBBF24;
    --danger-color: #F87171;
    --background-color: #0F172A;
    --card-background: #1E293B;
    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    --border-color: #334155;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
    --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.2);
    --shadow-success: 0 0 20px rgba(52, 211, 153, 0.2);
    --shadow-danger: 0 0 20px rgba(248, 113, 113, 0.2);
    --gradient-primary: linear-gradient(135deg, #2563EB 0%, #3B82F6 100%);
    --gradient-success: linear-gradient(135deg, #10B981 0%, #34D399 100%);
    --gradient-danger: linear-gradient(135deg, #EF4444 0%, #F87171 100%);
    --gradient-card: linear-gradient(145deg, #1E293B 0%, #0F172A 100%);
}

[data-theme="dark"] .card-front {
    background: linear-gradient(145deg, #1E293B, #0F172A);
}

[data-theme="dark"] .card-front .word-display .word {
    color: #1E293B;
}

[data-theme="dark"] .card-front.has-image .card-content {
    color: #FFFFFF;
}

[data-theme="dark"] .card-front:not(.has-image) .card-content {
    color: #1E293B;
}

[data-theme="dark"] .phonetic {
    color: #64748B;
}

.article-der {
    color: #3B82F6 !important;
}

.article-die {
    color: #EC4899 !important;
}

.article-das {
    color: #10B981 !important;
}

.article-plural {
    color: #8B5CF6 !important;
}

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--background-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    overflow-y: auto;
}

#app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    height: 100dvh;
    max-width: 480px;
    margin: 0 auto;
    background: var(--card-background);
    position: relative;
    overflow: hidden;
}

.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: var(--card-background);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: all 0.3s ease;
}

.app-header.header-hidden {
    display: none;
}

.page-header {
    display: none;
    align-items: center;
    justify-content: space-between;
    padding: 10px 0;
    background: var(--card-background);
    border-top: 1px solid var(--border-color);
    margin-top: 16px;
}

#learnPage.active .page-header,
#statsPage.active .page-header {
    display: flex;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-img {
    width: 28px;
    height: 28px;
    object-fit: contain;
}

.logo-text {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
}

.icon-btn {
    width: 36px;
    height: 36px;
    border: none;
    background: transparent;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.app-main {
    flex: 1;
    overflow-y: auto;
    padding-bottom: 80px;
}

.page {
    display: none;
    padding: 12px 16px;
    animation: fadeIn 0.3s ease;
}

.page.active {
    display: block;
}

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

.today-card {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: var(--radius-lg);
    padding: 20px;
    color: white;
    margin-bottom: 24px;
}

.today-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
}

.today-date {
    font-size: 14px;
    font-weight: 600;
    background: rgba(255, 255, 255, 0.2);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
}

.today-title {
    font-size: 18px;
    font-weight: 600;
}

.status-light {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 6px;
}

.status-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: #9CA3AF;
    box-shadow: 0 0 6px rgba(156, 163, 175, 0.5);
    transition: all 0.3s ease;
}

.status-light.status-red .status-dot {
    background-color: #EF4444 !important;
    box-shadow: 0 0 8px rgba(239, 68, 68, 0.6) !important;
}

.status-light.status-yellow .status-dot {
    background-color: #F59E0B !important;
    box-shadow: 0 0 8px rgba(245, 158, 11, 0.6) !important;
    animation: pulse-yellow 1.5s ease-in-out infinite;
}

.status-light.status-green .status-dot {
    background-color: #10B981 !important;
    box-shadow: 0 0 8px rgba(16, 185, 129, 0.6) !important;
}

.status-light.status-gray .status-dot {
    background-color: #9CA3AF !important;
    box-shadow: 0 0 6px rgba(156, 163, 175, 0.5) !important;
}

@keyframes pulse-yellow {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.7;
        transform: scale(1.1);
    }
}

.today-stats {
    display: flex;
    justify-content: space-around;
    margin-bottom: 16px;
}

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

.stat-value {
    display: block;
    font-size: 28px;
    font-weight: 700;
}

.stat-label {
    font-size: 12px;
    opacity: 0.9;
}

.progress-bar {
    height: 8px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 16px;
}

.progress-fill {
    height: 100%;
    background: white;
    border-radius: 4px;
    transition: width 0.3s ease;
}

.btn-primary {
    width: 100%;
    padding: 14px 24px;
    background: white;
    color: var(--primary-color);
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    padding: 12px 24px;
    background: var(--background-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.btn-danger {
    padding: 8px 16px;
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-danger:hover {
    background: #DC2626;
    transform: translateY(-1px);
}

.btn-danger:active {
    transform: translateY(0);
}

[data-theme="dark"] .btn-danger {
    background: #EF4444;
}

[data-theme="dark"] .btn-danger:hover {
    background: #F87171;
}

.section-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.package-section {
    margin-bottom: 24px;
}

.package-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.package-card {
    display: flex;
    align-items: center;
    padding: 16px;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.package-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.package-card.active {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.05);
}

.package-card.selected {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.08);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

.package-card.selected .package-info h3 {
    color: var(--primary-color);
}

.package-icon {
    font-size: 32px;
    margin-right: 12px;
}

.package-info {
    flex: 1;
}

.package-info h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.package-info p {
    font-size: 13px;
    color: var(--text-secondary);
}

.package-arrow {
    color: var(--primary-color);
    transition: transform 0.3s ease, color 0.2s ease;
}

.package-card:hover .package-arrow {
    color: var(--primary-dark);
    transform: translateY(2px);
}

.package-section {
    margin-bottom: 20px;
}

.package-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.package-header:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.package-selector {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-color);
    font-weight: 500;
}

.dropdown-icon {
    transition: transform 0.3s ease;
}

.package-header.open .dropdown-icon {
    transform: rotate(180deg);
}

.package-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: all 0.3s ease;
}

.package-overlay.show {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.package-panel {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--card-background);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    z-index: 1001;
    transform: translateY(100%);
    transition: transform 0.3s ease;
    max-height: 70vh;
    display: flex;
    flex-direction: column;
}

.package-panel.show {
    transform: translateY(0);
}

.package-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
}

.package-panel-header h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.panel-close-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--background-color);
    border: none;
    border-radius: 50%;
    font-size: 20px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.panel-close-btn:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.package-panel-list {
    flex: 1;
    overflow-y: auto;
    padding: 12px 16px 100px;
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
}

.package-panel-list::-webkit-scrollbar {
    width: 4px;
}

.package-panel-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 2px;
}

.package-item {
    display: flex;
    align-items: center;
    padding: 16px;
    background: var(--background-color);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.package-item:hover {
    border-color: var(--primary-color);
    background: var(--card-background);
}

.package-item.selected {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.08);
}

.package-item.disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.package-item-icon {
    font-size: 28px;
    margin-right: 12px;
}

.package-item-info {
    flex: 1;
}

.package-item-info h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.package-item-info p {
    font-size: 13px;
    color: var(--text-secondary);
}

.package-item-badge {
    padding: 4px 8px;
    background: var(--primary-color);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 11px;
    font-weight: 500;
}

.package-item.coming-soon .package-item-badge {
    background: var(--text-muted);
}

.confirm-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease;
}

.confirm-modal {
    background: var(--card-background);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 320px;
    overflow: hidden;
    animation: slideUp 0.3s ease;
}

.confirm-modal-content {
    padding: 24px 20px;
    text-align: center;
}

.confirm-modal-content h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.confirm-modal-content p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.confirm-modal-actions {
    display: flex;
    border-top: 1px solid var(--border-color);
}

.confirm-btn {
    flex: 1;
    padding: 14px;
    border: none;
    background: transparent;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s ease;
}

.confirm-btn.cancel {
    color: var(--text-secondary);
    border-right: 1px solid var(--border-color);
}

.confirm-btn.cancel:hover {
    background: var(--background-color);
}

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

.confirm-btn.confirm:hover {
    background: rgba(37, 99, 235, 0.1);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { 
        opacity: 0;
        transform: translateY(20px);
    }
    to { 
        opacity: 1;
        transform: translateY(0);
    }
}

.quick-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.action-card {
    display: flex;
    align-items: center;
    padding: 16px;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.action-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.action-icon {
    font-size: 28px;
    margin-right: 12px;
}

.action-info h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.action-info p {
    font-size: 12px;
    color: var(--text-secondary);
}

.learn-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.back-btn {
    width: 36px;
    height: 36px;
    border: none;
    background: transparent;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.learn-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
}

.learn-progress {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

.learn-progress-bar {
    margin-bottom: 8px;
}

.learn-progress-bar .progress-fill {
    background: var(--primary-color);
}

.card-container {
    perspective: 1000px;
    margin-bottom: 12px;
}

.word-card {
    width: 100%;
    height: 320px;
    cursor: pointer;
    position: relative;
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.1));
    transition: filter var(--transition-normal);
}

.word-card:hover {
    filter: drop-shadow(0 8px 12px rgba(0, 0, 0, 0.15));
}

.word-card.no-image {
    height: 280px;
}

.card-inner {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.word-card.flipped .card-inner {
    transform: rotateY(180deg);
}

.card-front, .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: var(--radius-lg);
    padding: 20px;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    transition: box-shadow var(--transition-normal);
}

.card-front {
    background: var(--gradient-card);
    border: 2px solid var(--border-color);
    align-items: center;
    justify-content: center;
}

.card-front.has-image {
    background-size: 110%;
    background-position: center;
    background-repeat: no-repeat;
}

.card-front .card-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.15);
    border-radius: var(--radius-lg);
    z-index: 1;
    display: none;
}

.card-front.has-image .card-overlay {
    display: block;
}

.card-front .card-content {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
}

.word-text-container {
    background: rgba(255, 255, 255, 0.85);
    padding: 16px 24px;
    border-radius: var(--radius-md);
    backdrop-filter: blur(4px);
    text-align: center;
    max-width: 90%;
}

.card-back {
    background: var(--card-background);
    border: 2px solid var(--primary-color);
    transform: rotateY(180deg);
    overflow: visible;
    justify-content: flex-start;
    padding: 12px 16px;
    gap: 8px;
    z-index: 2;
}

.card-back .meaning-section,
.card-back .plural-section,
.card-back .example-section {
    padding: 8px 10px;
    background: rgba(37, 99, 235, 0.05);
    border-radius: var(--radius-sm);
}

.card-back .meaning-label,
.card-back .plural-label,
.card-back .example-label {
    font-size: 11px;
    color: var(--text-secondary);
    margin-bottom: 4px;
    font-weight: 600;
}

.card-back .meaning-text {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.3;
}

.card-back .plural-text {
    font-size: 15px;
    color: var(--text-primary);
    font-weight: 500;
}

.card-back .example-de {
    font-size: 15px;
    color: var(--text-primary);
    margin-bottom: 2px;
    line-height: 1.3;
}

.card-back .example-zh {
    font-size: 13px;
    color: var(--text-secondary);
}

.speak-btn {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 44px;
    height: 44px;
    border: none;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-md);
    z-index: 10;
}

.speak-btn:hover {
    transform: scale(1.1);
    background: var(--primary-dark);
}

.speak-btn.speaking {
    animation: pulse 1s infinite;
}

.example-header {
    display: flex;
    align-items: center;
    margin-bottom: 4px;
    position: relative;
}

.speak-example-btn {
    position: absolute;
    right: 0;
    top: -8px;
    width: 36px;
    height: 36px;
    border: none;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
    z-index: 10;
    pointer-events: auto;
}

.speak-example-btn::before {
    content: '';
    position: absolute;
    width: 150%;
    height: 150%;
    top: -25%;
    left: -25%;
    border-radius: 50%;
    pointer-events: auto;
}

.speak-example-btn:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
    background: var(--primary-hover);
}

.speak-example-btn:active {
    transform: scale(0.95);
}

.speak-example-btn.speaking {
    animation: pulse 0.8s infinite;
}

.speak-example-btn.clicked {
    animation: btnClickFeedback 0.3s ease;
}

@keyframes btnClickFeedback {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(0.9);
        background: var(--primary-dark);
    }
    100% {
        transform: scale(1);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(37, 99, 235, 0.4);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 0 0 10px rgba(37, 99, 235, 0);
    }
}

.word-display {
    display: flex;
    align-items: baseline;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    max-width: 100%;
    text-align: center;
    margin-bottom: 8px;
}

.article {
    display: block;
    font-size: 18px;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.word {
    display: block;
    font-size: 36px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.5px;
    max-width: 100%;
    word-break: break-word;
    hyphens: auto;
}

.word-text-container {
    max-width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.word-text-container .word {
    font-size: clamp(20px, 5vw, 36px);
}

.phonetic {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.card-image {
    width: 100%;
    height: 120px;
    margin-bottom: 12px;
    border-radius: var(--radius-md);
    overflow: hidden;
    display: none;
    flex-shrink: 0;
}

.card-image.show {
    display: block;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.card-hint {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: auto;
}

.meaning-section, .plural-section, .verb-conjugation-section {
    margin-bottom: 16px;
}

.verb-conjugation-section {
    display: none;
}

.verb-conjugation-section.show {
    display: block;
}

.conjugation-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.conjugation-content {
    display: flex;
    gap: 16px;
}

.conjugation-item {
    flex: 1;
    background: rgba(37, 99, 235, 0.05);
    border-radius: var(--radius-sm);
    padding: 8px 12px;
}

.conjugation-type {
    display: block;
    font-size: 11px;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.conjugation-form {
    display: block;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.conjugation-form.irregular {
    color: var(--danger-color);
}

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

.example-section {
    margin-bottom: 16px;
    position: relative;
}

.meaning-label, .plural-label, .example-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.meaning-text {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.plural-text {
    font-size: 16px;
    color: var(--text-primary);
}

.example-de {
    font-size: 15px;
    color: var(--text-primary);
    margin-bottom: 4px;
    font-style: italic;
}

.example-zh {
    font-size: 14px;
    color: var(--text-secondary);
}

.feedback-buttons {
    display: flex;
    flex-direction: row;
    gap: 8px;
    margin-bottom: 16px;
    justify-content: center;
    flex-wrap: nowrap;
}

.feedback-btn {
    flex: 1;
    padding: 10px 4px;
    border: 2px solid var(--border-color);
    background: var(--card-background);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    min-width: 0;
    min-height: 60px;
    box-shadow: var(--shadow-sm), var(--shadow-inner);
    position: relative;
    overflow: hidden;
}

.feedback-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 50%;
    background: linear-gradient(180deg, rgba(255,255,255,0.1) 0%, transparent 100%);
    pointer-events: none;
}

.feedback-btn .btn-icon {
    font-size: 18px;
}

.feedback-btn .btn-text {
    font-size: 11px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
}

.feedback-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.feedback-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.feedback-btn.forgot {
    border-color: var(--danger-color);
}

.feedback-btn.forgot:hover {
    background: rgba(239, 68, 68, 0.1);
    box-shadow: var(--shadow-danger);
}

.feedback-btn.vague {
    border-color: var(--warning-color);
}

.feedback-btn.vague:hover {
    background: rgba(245, 158, 11, 0.1);
}

.feedback-btn.known {
    border-color: var(--success-color);
}

.feedback-btn.known:hover {
    background: rgba(16, 185, 129, 0.1);
    box-shadow: var(--shadow-success);
}

.feedback-btn.remembered {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.feedback-btn.remembered .btn-text {
    color: white;
}

.feedback-btn.remembered:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.feedback-btn.disabled {
    opacity: 0.6;
    cursor: not-allowed;
    background: var(--border-color);
    border-color: var(--border-color);
}

.feedback-btn.disabled:hover {
    transform: none;
    box-shadow: none;
}

.btn-icon {
    font-size: 24px;
}

.btn-text {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
}

.card-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
}

.action-btn {
    width: 48px;
    height: 48px;
    border: 2px solid var(--border-color);
    background: var(--card-background);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.action-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

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

.action-btn.active svg {
    fill: white;
}

.result-container {
    text-align: center;
    padding: 20px 16px;
}

.result-icon {
    font-size: 48px;
    margin-bottom: 12px;
}

.result-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.result-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-bottom: 16px;
}

.result-stat {
    padding: 16px 8px;
    background: var(--background-color);
    border-radius: var(--radius-md);
}

.result-value {
    display: block;
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
}

.result-label {
    font-size: 12px;
    color: var(--text-secondary);
}

.result-message {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.6;
}

.result-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.toast {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-primary);
    color: var(--card-background);
    padding: 12px 24px;
    border-radius: var(--radius-lg);
    font-size: 14px;
    font-weight: 500;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
    white-space: nowrap;
}

.toast.show {
    opacity: 1;
    visibility: visible;
}

.app-nav {
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 480px;
    display: flex;
    background: var(--card-background);
    border-top: 1px solid var(--border-color);
    padding: 0 0;
    padding-bottom: calc(0px + env(safe-area-inset-bottom));
    z-index: 100;
    box-sizing: border-box;
}

.nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 12px 8px;
    min-height: 56px;
    height: 100%;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    box-sizing: border-box;
    outline: none;
}

.nav-item:hover {
    color: var(--text-secondary);
    background: rgba(0, 0, 0, 0.02);
}

.nav-item:active {
    background: rgba(0, 0, 0, 0.05);
}

.nav-item.active {
    color: var(--primary-color);
}

.nav-label {
    font-size: 11px;
    font-weight: 500;
    pointer-events: none;
    display: block;
}

.nav-item svg {
    pointer-events: none;
    flex-shrink: 0;
}

.stats-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 10px;
}

.stats-header h2 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
}

.report-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.report-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.stats-overview {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    margin-bottom: 16px;
}

.overview-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 12px 8px;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.overview-icon {
    font-size: 24px;
    margin-bottom: 4px;
}

.overview-info {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.overview-value {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
}

.overview-label {
    font-size: 11px;
    color: var(--text-secondary);
}

.stats-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 16px;
}

.stats-section {
    margin-bottom: 24px;
}

.stats-section:last-child {
    margin-bottom: 100px;
    margin-top: 20px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.section-header .section-title {
    margin-bottom: 0;
}

.achievement-progress {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 400;
}

.expand-btn {
    width: 28px;
    height: 28px;
    border: 1px solid var(--border-color);
    background: var(--card-background);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-secondary);
}

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

.expand-btn.expanded svg {
    transform: rotate(180deg);
}

.trend-chart {
    display: flex;
    align-items: flex-end;
    gap: 4px;
    height: 80px;
    padding: 12px;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.trend-bar {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.trend-bar-fill {
    width: 100%;
    max-width: 24px;
    background: linear-gradient(to top, var(--primary-color), var(--primary-light));
    border-radius: 3px 3px 0 0;
    transition: height 0.3s ease;
}

.trend-bar-label {
    font-size: 9px;
    color: var(--text-muted);
}

.achievement-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    transition: max-height 0.3s ease;
    overflow: hidden;
}

.achievement-grid.collapsed {
    max-height: 140px;
}

.achievement-grid.expanded {
    max-height: 500px;
}

.achievement-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 10px 6px;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

.achievement-item.locked {
    opacity: 0.5;
    filter: grayscale(1);
}

.achievement-item.unlocked {
    border-color: var(--warning-color);
    background: rgba(245, 158, 11, 0.08);
}

.achievement-icon {
    font-size: 24px;
    margin-bottom: 4px;
}

.achievement-name {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
    line-height: 1.2;
}

.record-list {
    max-height: 200px;
    overflow-y: auto;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.record-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 12px;
    border-bottom: 1px solid var(--border-color);
}

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

.record-date {
    font-size: 13px;
    color: var(--text-secondary);
}

.record-count {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.record-accuracy {
    font-size: 12px;
    color: var(--success-color);
    margin-left: 8px;
}

@media (max-width: 360px) {
    .result-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .achievement-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .feedback-buttons {
        gap: 6px;
    }
    
    .feedback-btn {
        padding: 8px 2px;
        min-height: 54px;
    }
    
    .feedback-btn .btn-icon {
        font-size: 16px;
    }
    
    .feedback-btn .btn-text {
        font-size: 10px;
    }
    
    .word-card {
        height: 260px;
    }
    
    .card-container {
        padding: 8px;
    }
    
    .today-card {
        padding: 16px;
    }
    
    .today-stats {
        gap: 12px;
    }
    
    .package-card {
        padding: 12px;
    }
}

@media (max-width: 320px) {
    .feedback-buttons {
        gap: 4px;
    }
    
    .feedback-btn {
        padding: 6px 2px;
        min-height: 50px;
    }
    
    .feedback-btn .btn-icon {
        font-size: 14px;
    }
    
    .feedback-btn .btn-text {
        font-size: 9px;
    }
    
    .word-card {
        height: 240px;
    }
    
    .app-header {
        padding: 10px 12px;
    }
    
    .logo-text {
        font-size: 16px;
    }
    
    .page {
        padding: 12px;
    }
}

@media (max-height: 700px) {
    .word-card {
        height: 280px;
    }
    
    .card-back {
        padding: 10px 14px;
        gap: 6px;
    }
    
    .card-back .meaning-section,
    .card-back .plural-section,
    .card-back .example-section {
        padding: 6px 10px;
    }
    
    .card-back .meaning-label,
    .card-back .plural-label,
    .card-back .example-label {
        font-size: 10px;
        margin-bottom: 3px;
    }
    
    .card-back .meaning-text {
        font-size: 16px;
    }
    
    .card-back .plural-text {
        font-size: 14px;
    }
    
    .card-back .example-de {
        font-size: 14px;
    }
    
    .card-back .example-zh {
        font-size: 12px;
    }
    
    .card-container {
        padding: 8px;
    }
    
    .feedback-buttons {
        margin-bottom: 10px;
    }
    
    .card-actions {
        margin-top: 6px;
    }
    
    .result-container {
        padding: 16px 12px;
    }
    
    .result-icon {
        font-size: 40px;
        margin-bottom: 8px;
    }
}

@media (max-height: 600px) {
    .word-card {
        height: 240px;
    }
    
    .card-back {
        padding: 10px 12px;
        gap: 6px;
    }
    
    .card-back .meaning-section,
    .card-back .plural-section,
    .card-back .example-section {
        padding: 6px 8px;
    }
    
    .card-back .meaning-label,
    .card-back .plural-label,
    .card-back .example-label {
        font-size: 10px;
        margin-bottom: 2px;
    }
    
    .card-back .meaning-text {
        font-size: 15px;
    }
    
    .card-back .plural-text {
        font-size: 13px;
    }
    
    .card-back .example-de {
        font-size: 13px;
    }
    
    .card-back .example-zh {
        font-size: 11px;
    }
    
    .app-header {
        padding: 6px 12px;
    }
    
    .logo-img {
        width: 24px;
        height: 24px;
    }
    
    .logo-text {
        font-size: 14px;
    }
    
    .learn-header {
        margin-bottom: 6px;
    }
    
    .learn-progress-bar {
        margin-bottom: 6px;
    }
    
    .feedback-btn {
        padding: 6px 2px;
        min-height: 48px;
    }
    
    .feedback-btn .btn-icon {
        font-size: 16px;
    }
    
    .feedback-btn .btn-text {
        font-size: 10px;
    }
    
    .result-container {
        padding: 12px 8px;
    }
    
    .result-icon {
        font-size: 36px;
        margin-bottom: 6px;
    }
    
    .result-title {
        font-size: 18px;
        margin-bottom: 12px;
    }
}

@media (min-width: 481px) {
    #app {
        box-shadow: var(--shadow-lg);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.settings-page {
    padding: 16px;
}

.settings-header {
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 16px;
}

.settings-header h2 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
}

.settings-section {
    margin-bottom: 16px;
}

.settings-section .section-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 12px;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 10px;
}

.setting-info {
    flex: 1;
}

.setting-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.setting-desc {
    font-size: 12px;
    color: var(--text-secondary);
}

.setting-control {
    flex-shrink: 0;
    margin-left: 16px;
}

.setting-control:not(:has(.custom-select-wrapper)) {
    min-width: 120px;
    text-align: right;
}

.slider-with-value {
    display: flex;
    align-items: center;
    gap: 12px;
}

.setting-select {
    width: 120px;
    min-width: 120px;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--card-background);
    font-size: 14px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 30px;
}

.setting-select:focus {
    border-color: var(--primary-color);
    outline: none;
}

.custom-select-wrapper {
    position: relative;
    width: 120px;
}

.custom-select-trigger {
    width: 100%;
    padding: 10px 30px 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--card-background);
    font-size: 14px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.custom-select-trigger::after {
    content: '';
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid var(--text-secondary);
    transition: transform 0.2s ease;
}

.custom-select-wrapper.open .custom-select-trigger::after {
    transform: rotate(180deg);
}

.custom-select-options {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-top: 4px;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 100;
    display: none;
    max-height: 360px;
}

.custom-select-wrapper.open .custom-select-options {
    display: block;
}

.custom-select-option {
    padding: 10px 12px;
    cursor: pointer;
    transition: background 0.15s ease;
}

.custom-select-option:hover {
    background: var(--bg-secondary);
}

.custom-select-option.selected {
    background: var(--primary-color);
    color: white;
}

.setting-slider {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    background: var(--primary-color);
    border-radius: 3px;
    cursor: pointer;
}

.setting-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: white;
    border-radius: 50%;
    cursor: pointer;
}

.slider-value {
    font-size: 12px;
    color: var(--text-secondary);
    min-width: 40px;
    text-align: center;
}

.theme-switch {
    position: relative;
    display: inline-block;
    width: 56px;
    height: 28px;
    cursor: pointer;
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.theme-slider {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, #F8FAFC 0%, #E2E8F0 50%, #1E293B 50%, #0F172A 100%);
    border-radius: 14px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
    border: 2px solid var(--border-color);
}

.theme-knob {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background: linear-gradient(135deg, #2563EB 0%, #1D4ED8 100%);
    border-radius: 50%;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 6px rgba(37, 99, 235, 0.4);
    z-index: 2;
}

.theme-switch input:checked + .theme-slider .theme-knob {
    transform: translateX(28px);
    background: linear-gradient(135deg, #3B82F6 0%, #60A5FA 100%);
    box-shadow: 0 2px 6px rgba(59, 130, 246, 0.5);
}

.btn-secondary.btn-sm {
    padding: 8px 16px;
    font-size: 13px;
}

.settings-footer {
    text-align: center;
    padding: 16px;
    color: var(--text-muted);
    font-size: 12px;
}

.version-info {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.copyright {
    font-size: 11px;
    color: var(--text-muted);
}

.word-card {
    animation: slideIn 0.3s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.shake {
    animation: shake 0.3s ease;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background: #ffffff;
    border-radius: 16px;
    padding: 24px;
    max-width: 320px;
    width: 90%;
    text-align: center;
    box-shadow: var(--shadow-lg);
    animation: modalIn 0.3s ease;
}

[data-theme="dark"] .modal-content {
    background: #1f2937;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.modal-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.modal-message {
    font-size: 14px;
    color: #374151;
    line-height: 1.5;
    margin-bottom: 24px;
}

[data-theme="dark"] .modal-message {
    color: #d1d5db;
}

.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.modal-actions .btn-secondary,
.modal-actions .btn-primary {
    min-width: 100px;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.modal-actions .btn-secondary:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.modal-actions .btn-primary {
    background: var(--primary-color);
    border: none;
    color: white;
}

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

.test-section {
    margin-top: 20px;
}

.test-cards {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.test-card {
    display: flex;
    align-items: center;
    padding: 16px;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.test-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.test-icon {
    font-size: 28px;
    margin-right: 12px;
}

.test-info {
    flex: 1;
}

.test-info h3 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.test-info p {
    font-size: 12px;
    color: var(--text-secondary);
}

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

.test-header {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    background: var(--card-background);
    border-bottom: 1px solid var(--border-color);
}

.test-header .back-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius-sm);
}

.test-header .back-btn:hover {
    background: var(--background-color);
}

.test-title {
    flex: 1;
    text-align: center;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.test-progress {
    font-size: 14px;
    color: var(--text-secondary);
    min-width: 50px;
    text-align: right;
}

.test-progress-bar {
    margin: 0;
    border-radius: 0;
}

.listening-content,
.spelling-content {
    padding: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 280px;
}

.replay-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 16px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 12px;
    width: 64px;
    height: 64px;
}

.replay-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.3);
}

.replay-btn span {
    position: absolute;
    margin-top: 56px;
    font-size: 11px;
    white-space: nowrap;
    color: var(--text-primary);
}

.listening-hint {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    text-align: center;
}

.listening-options {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.listening-option-btn {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 14px 16px;
    background: var(--card-background);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
}

.listening-option-btn:hover:not(:disabled) {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.05);
}

.listening-option-btn:disabled {
    cursor: default;
}

.listening-option-btn.correct {
    border-color: var(--success-color);
    background: rgba(16, 185, 129, 0.1);
}

.next-watermark {
    display: block;
    width: 100%;
    text-align: center;
    font-size: 12px;
    font-weight: 400;
    color: var(--text-muted);
    margin-top: 2px;
    z-index: -1;
    position: relative;
    pointer-events: none;
    line-height: 1;
}

.listening-option-btn.wrong {
    border-color: var(--danger-color);
    background: rgba(239, 68, 68, 0.1);
}

.option-label {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--background-color);
    border-radius: 50%;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-right: 12px;
}

.listening-option-btn.correct .option-label {
    background: var(--success-color);
    color: white;
}

.listening-option-btn.wrong .option-label {
    background: var(--danger-color);
    color: white;
}

.option-text {
    font-size: 14px;
    color: var(--text-primary);
    flex: 1;
}

.option-feedback {
    display: block;
    font-size: 16px;
    font-weight: 700;
    margin-top: 8px;
    padding: 4px 0;
}

.option-feedback.correct {
    color: var(--success-color);
}

.option-feedback.wrong {
    color: var(--danger-color);
}

.next-btn-inline {
    display: block;
    width: 100%;
    padding: 4px 12px;
    background: transparent;
    color: var(--text-muted);
    border: none;
    font-size: 12px;
    font-weight: 400;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: right;
    z-index: 1;
}

.next-btn-inline:hover {
    color: var(--text-secondary);
}

.listening-option-btn.flash {
    animation: flash-animation 0.8s ease-in-out infinite;
}

@keyframes flash-animation {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4);
    }
    50% {
        box-shadow: 0 0 0 8px rgba(16, 185, 129, 0);
    }
}

.listening-option-btn.correct {
    cursor: pointer !important;
}

.listening-option-btn {
    position: relative;
    overflow: visible;
}

.option-content {
    display: flex;
    align-items: center;
    position: relative;
    z-index: 1;
}

.option-feedback-layer {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: none;
    justify-content: flex-end;
    align-items: center;
    padding: 14px 16px;
    background: transparent;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    z-index: 10;
    white-space: nowrap;
    pointer-events: none;
}

.option-feedback-layer.show {
    display: flex;
}

.option-feedback-layer.correct {
    color: var(--success-color);
}

.option-feedback-layer.correct-answer {
    color: var(--success-color);
}

.option-feedback-layer.wrong {
    color: var(--danger-color);
}

.option-feedback-layer .feedback-icon {
    margin-right: 6px;
}

.category-test-content {
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: calc(100vh - 120px);
}

.category-mode-toggle {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
    padding: 8px 16px;
    background: var(--background-color);
    border-radius: var(--radius-md);
}

#categoryModeText {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

.mode-toggle-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--primary-color);
}

.mode-toggle-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.category-question {
    text-align: center;
    margin-bottom: 24px;
    width: 100%;
}

.category-question-word {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.category-question-hint {
    font-size: 14px;
    color: var(--text-secondary);
}

.category-hint {
    margin-top: 12px;
    padding: 8px 16px;
    background: rgba(37, 99, 235, 0.1);
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: var(--primary-color);
}

.category-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    width: 100%;
    max-width: 400px;
}

.category-option-btn {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 16px;
    background: var(--card-background);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    overflow: hidden;
}

.category-option-btn:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.category-option-btn:disabled {
    cursor: default;
}

.category-option-btn.selected {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.1);
}

.category-option-btn.correct {
    border-color: var(--success-color);
    background: rgba(16, 185, 129, 0.1);
}

.category-option-btn.wrong {
    border-color: var(--danger-color);
    background: rgba(239, 68, 68, 0.1);
}

.category-option-btn .option-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    position: relative;
    z-index: 1;
}

.category-option-btn .option-label {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--background-color);
    border-radius: 50%;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
}

.category-option-btn .option-text {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.category-option-btn .option-category {
    font-size: 11px;
    color: var(--text-muted);
    padding: 2px 8px;
    background: var(--background-color);
    border-radius: var(--radius-sm);
}

.category-option-btn .option-feedback-layer {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: none;
    justify-content: center;
    align-items: center;
    background: var(--card-background);
    z-index: 10;
    font-size: 16px;
    font-weight: 600;
}

.category-option-btn .option-feedback-layer.show {
    display: flex;
}

.category-option-btn .option-feedback-layer.correct {
    background: rgba(16, 185, 129, 0.9);
    color: white;
}

.category-option-btn .option-feedback-layer.wrong {
    background: rgba(239, 68, 68, 0.9);
    color: white;
}

.category-submit-btn {
    margin-top: 24px;
    padding: 12px 32px;
    font-size: 16px;
}

.category-next-btn {
    margin-top: 16px;
    padding: 12px 32px;
    font-size: 16px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.category-next-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.option-feedback-layer .feedback-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 16px;
    font-weight: 600;
}

.option-feedback-layer .feedback-meaning {
    font-size: 12px;
    opacity: 0.9;
    margin-top: 4px;
}

.question-category {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.question-word-main {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
}

.question-word-meaning {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.option-feedback-layer .feedback-text {
    margin-right: 6px;
}

.option-feedback-layer .feedback-word {
    font-weight: 600;
}

.option-next-hint {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: none;
    justify-content: center;
    align-items: center;
    background: transparent;
    color: var(--primary-color);
    font-size: 13px;
    font-weight: 600;
    z-index: 11;
    white-space: nowrap;
    pointer-events: none;
    border: none;
    box-shadow: none;
    padding: 0;
}

.option-next-hint.show {
    display: flex;
    animation: text-pulse 1s ease-in-out infinite;
}

.listening-option-btn.pulse {
    animation: pulse-glow 1s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4);
    }
    50% {
        box-shadow: 0 0 0 6px rgba(16, 185, 129, 0);
    }
}

@keyframes text-pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.next-question-btn {
    display: block;
    width: 100%;
    margin-top: 16px;
    padding: 12px 24px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.listening-feedback {
    margin-top: 16px;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    text-align: center;
    display: none;
}

.listening-feedback.correct {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.listening-feedback.wrong {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

.feedback-icon {
    margin-right: 8px;
}

.spelling-question {
    text-align: center;
    margin-bottom: 20px;
}

.spelling-hint {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.spelling-translation {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.spelling-article-hint {
    font-size: 16px;
    color: var(--text-secondary);
}

.spelling-input-container {
    width: 100%;
    margin-bottom: 16px;
}

.spelling-input {
    width: 100%;
    padding: 14px 16px;
    font-size: 18px;
    text-align: center;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--card-background);
    color: var(--text-primary);
    transition: all 0.2s ease;
}

.spelling-input:focus {
    border-color: var(--primary-color);
    outline: none;
}

.spelling-input:disabled {
    background: var(--background-color);
}

.german-chars-bar {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.german-char-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 16px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.german-char-btn:hover {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.05);
}

.spelling-feedback {
    margin-bottom: 16px;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    text-align: center;
    display: none;
}

.spelling-feedback.correct {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.spelling-feedback.wrong {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

.spelling-feedback.partial {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
}

.spelling-feedback.skip {
    background: rgba(100, 116, 139, 0.1);
    color: var(--text-secondary);
}

.spelling-feedback.unknown {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

.spelling-correct-answer {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 20px;
    text-align: center;
    display: none;
}

.spelling-translation-wrapper {
    position: relative;
    display: inline-block;
}

.spelling-correct-overlay {
    position: absolute;
    left: 100%;
    top: 50%;
    transform: translateY(-50%);
    margin-left: 12px;
    white-space: nowrap;
    display: none;
}

.spelling-correct-overlay.show {
    display: block;
    color: var(--success-color);
    font-size: 16px;
    font-weight: 600;
}

.spelling-animation-overlay {
    position: absolute;
    top: 80px;
    left: 16px;
    right: 16px;
    background: var(--card-background);
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-md);
    padding: 16px;
    z-index: 100;
    display: none;
    box-shadow: var(--shadow-lg);
}

.spelling-animation-overlay.show {
    display: block;
}

.spelling-animation-overlay-title {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 12px;
    text-align: center;
}

.spelling-animation-overlay-content {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2px;
    flex-wrap: wrap;
}

.spelling-animation-overlay-actions {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 16px;
}

.spelling-letter {
    font-size: 28px;
    font-weight: 600;
    font-family: 'Segoe UI', 'Roboto', 'Noto Sans', 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-primary);
    opacity: 0;
    transform: scale(0.5);
    animation: spelling-letter-appear 0.3s ease-out forwards;
}

.spelling-letter.spelling-space {
    width: 16px;
}

@keyframes spelling-letter-appear {
    from {
        opacity: 0;
        transform: scale(0.5) translateY(-5px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.correct-answer-label {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.correct-answer-word {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.play-correct-btn {
    padding: 8px 16px;
    background: var(--primary-color);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.spelling-actions {
    display: flex;
    gap: 10px;
    width: 100%;
    justify-content: center;
}

.spelling-actions .btn-secondary,
.spelling-actions .btn-primary {
    padding: 10px 16px;
    min-width: 80px;
    font-size: 13px;
    white-space: nowrap;
    border: 1px solid var(--border-color);
}

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

[data-theme="dark"] .spelling-actions .btn-primary {
    background: var(--primary-color);
    color: white;
}

.spelling-actions .btn-secondary {
    background: var(--card-background);
}

.word-parameters {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 8px;
    font-size: 12px;
    color: var(--text-secondary);
}

.param-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.spelling-animation {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-bottom: 20px;
    text-align: center;
    display: none;
}

.spelling-animation-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.spelling-animation-word {
    font-size: 28px;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 16px;
    min-height: 36px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2px;
}

.char-animate {
    display: inline-block;
    animation: charAppear 0.3s ease-out forwards;
    opacity: 0;
    transform: translateY(-10px);
}

@keyframes charAppear {
    0% {
        opacity: 0;
        transform: translateY(-10px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.spelling-animation-syllables {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.syllable {
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.syllable-0 {
    background: rgba(59, 130, 246, 0.15);
    color: #3B82F6;
}

.syllable-1 {
    background: rgba(16, 185, 129, 0.15);
    color: #10B981;
}

.syllable-2 {
    background: rgba(245, 158, 11, 0.15);
    color: #F59E0B;
}

.syllable-3 {
    background: rgba(236, 72, 153, 0.15);
    color: #EC4899;
}

.syllable-4 {
    background: rgba(139, 92, 246, 0.15);
    color: #8B5CF6;
}

.syllable.active {
    transform: scale(1.2);
    box-shadow: 0 0 10px rgba(37, 99, 235, 0.3);
}

.play-syllable-btn {
    padding: 10px 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.play-syllable-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.play-syllable-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.listening-feedback .feedback-word {
    display: block;
    margin-top: 8px;
    font-size: 18px;
    font-weight: 600;
}

.listening-feedback .feedback-answer {
    font-weight: 600;
    font-size: 16px;
}

.listening-feedback .feedback-text {
    margin: 0 8px;
}

.replay-btn.playing {
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

.overview-card.clickable {
    cursor: pointer;
    transition: all 0.2s ease;
}

.overview-card.clickable:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.overview-card.clickable:active {
    transform: translateY(0);
}

.daily-record-header {
    display: flex;
    align-items: center;
    padding: 16px;
    background: var(--card-background);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 10;
}

.daily-record-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-left: 12px;
}

.daily-record-summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    padding: 16px;
    margin: 16px;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.summary-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 8px;
}

.summary-label {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.summary-value {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
}

.daily-record-list {
    padding: 0 16px 100px;
}

.no-record-hint {
    text-align: center;
    color: var(--text-muted);
    padding: 40px;
    font-size: 14px;
}

.daily-word-item {
    display: flex;
    align-items: center;
    padding: 10px 16px;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    margin-bottom: 6px;
    gap: 12px;
}

.daily-word-index {
    min-width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-size: 12px;
    font-weight: 600;
    flex-shrink: 0;
}

.daily-word-text {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
    text-align: left;
}

.daily-word-meaning {
    font-size: 14px;
    color: var(--text-secondary);
    text-align: right;
    flex-shrink: 0;
}

.daily-word-item.has-mistake {
    background: rgba(239, 68, 68, 0.05);
    border-color: rgba(239, 68, 68, 0.3);
}

.daily-word-item.has-mistake .daily-word-index {
    background: var(--danger-color);
}

.daily-word-item.has-mistake .daily-word-text {
    color: var(--danger-color);
}

.daily-word-item.has-mistake .daily-word-meaning {
    color: var(--danger-color);
}

.daily-word-actions {
    display: flex;
    gap: 8px;
    margin-top: 12px;
}

.daily-word-actions button {
    padding: 6px 12px;
    font-size: 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
}

.daily-play-btn {
    background: var(--primary-color);
    color: white;
    border: none;
}

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

.calendar-header {
    display: flex;
    align-items: center;
    padding: 16px;
    background: var(--card-background);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 10;
}

.calendar-nav {
    display: flex;
    align-items: center;
    margin-left: auto;
    gap: 12px;
}

.calendar-nav-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-secondary);
}

.calendar-nav-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.calendar-month {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    min-width: 100px;
    text-align: center;
}

.calendar-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    padding: 12px 16px;
    background: var(--card-background);
    border-bottom: 1px solid var(--border-color);
}

.calendar-weekdays span {
    text-align: center;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
    padding: 16px;
    padding-bottom: 100px;
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.calendar-day.empty {
    cursor: default;
}

.calendar-day.other-month {
    color: var(--text-muted);
}

.calendar-day.today {
    border: 2px solid var(--primary-color);
    font-weight: 600;
}

.calendar-day.checked {
    color: white;
    font-weight: 500;
}

.calendar-day.level-1 {
    background: rgba(37, 99, 235, 0.2);
    color: var(--text-primary);
}

.calendar-day.level-2 {
    background: rgba(37, 99, 235, 0.4);
    color: var(--text-primary);
}

.calendar-day.level-3 {
    background: rgba(37, 99, 235, 0.6);
    color: white;
}

.calendar-day.level-4 {
    background: rgba(37, 99, 235, 0.8);
    color: white;
}

.calendar-day.level-5 {
    background: var(--primary-color);
    color: white;
}

.calendar-day:hover:not(.empty) {
    transform: scale(1.1);
    z-index: 1;
}

.calendar-legend {
    display: flex;
    justify-content: center;
    gap: 16px;
    padding: 16px;
    background: var(--card-background);
    border-top: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.legend-color {
    width: 16px;
    height: 16px;
    border-radius: 4px;
}

.legend-color.level-1 {
    background: rgba(37, 99, 235, 0.2);
}

.legend-color.level-2 {
    background: rgba(37, 99, 235, 0.4);
}

.legend-color.level-3 {
    background: rgba(37, 99, 235, 0.6);
}

.legend-color.level-4 {
    background: rgba(37, 99, 235, 0.8);
}

.legend-color.level-5 {
    background: var(--primary-color);
}

.legend-label {
    font-size: 11px;
    color: var(--text-secondary);
}

.record-item {
    cursor: pointer;
    transition: all 0.2s ease;
}

.record-item:hover {
    background: var(--background-color);
}

[data-theme="dark"] .calendar-day.level-1 {
    background: rgba(59, 130, 246, 0.2);
    color: var(--text-primary);
}

[data-theme="dark"] .calendar-day.level-2 {
    background: rgba(59, 130, 246, 0.4);
    color: var(--text-primary);
}

[data-theme="dark"] .calendar-day.level-3 {
    background: rgba(59, 130, 246, 0.6);
    color: white;
}

[data-theme="dark"] .calendar-day.level-4 {
    background: rgba(59, 130, 246, 0.8);
    color: white;
}

[data-theme="dark"] .calendar-day.level-5 {
    background: var(--primary-color);
    color: white;
}

[data-theme="dark"] .legend-color.level-1 {
    background: rgba(59, 130, 246, 0.2);
}

[data-theme="dark"] .legend-color.level-2 {
    background: rgba(59, 130, 246, 0.4);
}

[data-theme="dark"] .legend-color.level-3 {
    background: rgba(59, 130, 246, 0.6);
}

[data-theme="dark"] .legend-color.level-4 {
    background: rgba(59, 130, 246, 0.8);
}

[data-theme="dark"] .legend-color.level-5 {
    background: var(--primary-color);
}

.report-header {
    display: flex;
    align-items: center;
    padding: 16px;
    background: var(--card-background);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 10;
}

.report-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-left: 12px;
}

.report-content {
    padding: 16px;
    padding-bottom: 80px;
}

.report-section {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 16px;
}

.report-section .section-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.report-stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.report-stat-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: var(--background-color);
    border-radius: var(--radius-sm);
}

.report-stat-card .stat-icon {
    font-size: 24px;
}

.report-stat-card .stat-info {
    display: flex;
    flex-direction: column;
}

.report-stat-card .stat-value {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
}

.report-stat-card .stat-label {
    font-size: 12px;
    color: var(--text-secondary);
}

.report-mistakes-summary {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-bottom: 16px;
    padding: 16px;
    background: var(--background-color);
    border-radius: var(--radius-sm);
}

.mistake-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.mistake-count {
    font-size: 24px;
    font-weight: 700;
    color: var(--danger-color);
}

.mistake-stat:last-child .mistake-count {
    color: var(--success-color);
}

.mistake-label {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.report-category-analysis {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.category-mistake-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.category-mistake-name {
    width: 80px;
    font-size: 13px;
    color: var(--text-secondary);
}

.category-mistake-bar {
    flex: 1;
    height: 8px;
    background: var(--background-color);
    border-radius: 4px;
    overflow: hidden;
}

.category-mistake-fill {
    height: 100%;
    background: var(--danger-color);
    border-radius: 4px;
    transition: width 0.3s ease;
}

.category-mistake-count {
    width: 40px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    text-align: right;
}

.report-achievements {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.achievement-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 12px;
    background: var(--background-color);
    border-radius: var(--radius-sm);
    text-align: center;
}

.achievement-item.locked {
    opacity: 0.5;
}

.achievement-icon {
    font-size: 28px;
    margin-bottom: 8px;
}

.achievement-name {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.achievement-desc {
    font-size: 10px;
    color: var(--text-secondary);
}