/* Japanese Study App - Custom CSS */

/* CSS Custom Properties for theming */
:root {
    --mdc-theme-primary: #BC002D;
    --mdc-theme-secondary: #dc004e;
    --mdc-theme-background: #ffffff;
    --mdc-theme-surface: #ffffff;
    --mdc-theme-error: #b00020;
    --mdc-theme-on-primary: #ffffff;
    --mdc-theme-on-secondary: #ffffff;
    --mdc-theme-on-surface: #000000;
    --mdc-theme-on-error: #ffffff;
    
    /* Custom colors */
    --success-color: #4caf50;
    --warning-color: #ff9800;
    --info-color: #BC002D;
    --text-primary: rgba(0, 0, 0, 0.87);
    --text-secondary: rgba(0, 0, 0, 0.6);
    --divider-color: rgba(0, 0, 0, 0.12);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    
    /* Border radius */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;
    
    /* Shadows */
    --shadow-1: 0 2px 1px -1px rgba(0,0,0,.2), 0 1px 1px 0 rgba(0,0,0,.14), 0 1px 3px 0 rgba(0,0,0,.12);
    --shadow-2: 0 3px 1px -2px rgba(0,0,0,.2), 0 2px 2px 0 rgba(0,0,0,.14), 0 1px 5px 0 rgba(0,0,0,.12);
    --shadow-3: 0 3px 3px -2px rgba(0,0,0,.2), 0 3px 4px 0 rgba(0,0,0,.14), 0 1px 8px 0 rgba(0,0,0,.12);
    --shadow-4: 0 2px 4px -1px rgba(0,0,0,.2), 0 4px 5px 0 rgba(0,0,0,.14), 0 1px 10px 0 rgba(0,0,0,.12);
    --shadow-5: 0 5px 5px -3px rgba(0,0,0,.2), 0 8px 10px 1px rgba(0,0,0,.14), 0 3px 14px 2px rgba(0,0,0,.12);
}

/* Dark theme */
[data-theme="dark"] {
    --mdc-theme-primary: #d32f2f;
    --mdc-theme-secondary: #f48fb1;
    --mdc-theme-background: #121212;
    --mdc-theme-surface: #1e1e1e;
    --mdc-theme-error: #cf6679;
    --mdc-theme-on-primary: #ffffff;
    --mdc-theme-on-secondary: #000000;
    --mdc-theme-on-surface: #ffffff;
    --mdc-theme-on-error: #000000;
    
    --text-primary: rgba(255, 255, 255, 0.87);
    --text-secondary: rgba(255, 255, 255, 0.6);
    --divider-color: rgba(255, 255, 255, 0.12);
}

/* Global styles */
* {
    box-sizing: border-box;
}


body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
    background-color: var(--mdc-theme-background);
    color: var(--text-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Top app bar */
.mdc-top-app-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: var(--mdc-theme-primary);
    color: var(--mdc-theme-on-primary);
}

.mdc-top-app-bar__title {
    font-weight: 500;
    font-size: 1.25rem;
}

/* Main content */
.main-content {
    margin-top: 64px;
    min-height: calc(100vh - 64px);
    padding: var(--spacing-lg);
    background-color: var(--mdc-theme-background);
}

/* Welcome screen */
.welcome-screen {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xxl) 0;
}

.welcome-card {
    margin: 0 auto;
    max-width: 800px;
    box-shadow: var(--shadow-3);
    border-radius: var(--border-radius-lg);
}

.card-content {
    padding: var(--spacing-xxl);
}

.welcome-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 300;
    margin: 0 0 var(--spacing-md) 0;
    color: var(--text-primary);
}

.welcome-subtitle {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin: 0 0 var(--spacing-xxl) 0;
}

/* Character set grid */
.character-set-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.character-set-card {
    background: var(--mdc-theme-surface);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-1);
    border: 2px solid transparent;
}

.character-set-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-4);
    border-color: var(--mdc-theme-primary);
}

.character-set-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    color: var(--mdc-theme-primary);
    font-weight: 300;
}

.character-set-card h3 {
    margin: 0 0 var(--spacing-sm) 0;
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.character-set-card p {
    margin: 0 0 var(--spacing-lg) 0;
    color: var(--text-secondary);
    font-size: 0.875rem;
}



/* Study session */
.study-session {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-xl) 0;
}

.session-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--mdc-theme-surface);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-1);
}

.session-info h2 {
    margin: 0 0 var(--spacing-sm) 0;
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--text-primary);
}



.session-stats {
    display: flex;
    gap: var(--spacing-lg);
}

.stat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.stat-item .material-icons {
    font-size: 1rem;
}

/* Flashcard */
.flashcard-container {
    margin-bottom: var(--spacing-xl);
}

.flashcard {
    max-width: 500px;
    margin: 0 auto;
    box-shadow: var(--shadow-3);
    border-radius: var(--border-radius-lg);
    transition: opacity 0.3s ease;
}


.card-front, .card-back {
    padding: var(--spacing-xxl);
    text-align: center;
}


.character-display {
    margin-bottom: var(--spacing-xl);
}

.japanese-character {
    font-size: 6rem;
    font-weight: 300;
    color: var(--mdc-theme-on-surface);
    display: block;
    margin-bottom: var(--spacing-md);
}

.instruction p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin: 0 0 var(--spacing-lg) 0;
}

.input-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    align-items: center;
}

/* Result display */
.result-display {
    margin-bottom: var(--spacing-xl);
}

.result-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-lg);
}

.result-icon.correct {
    color: var(--success-color);
}

.result-icon.incorrect {
    color: var(--mdc-theme-error);
}

.character-info {
    margin-bottom: var(--spacing-lg);
}

.romaji {
    display: block;
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.english-meaning {
    display: block;
    font-size: 1.25rem;
    color: var(--text-primary);
    font-weight: 500;
}

.feedback-message {
    font-size: 1.125rem;
    font-weight: 500;
}

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

.feedback-message.incorrect {
    color: var(--mdc-theme-error);
}

.action-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}



/* Statistics modal */
.stats-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: var(--spacing-lg);
    animation: fadeIn 0.2s ease-out;
}

.stats-card {
    max-width: 600px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--shadow-5);
    border-radius: var(--border-radius-lg);
    animation: slideIn 0.3s ease-out;
    cursor: default;
}

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

.stats-header h3 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.stats-header .mdc-icon-button {
    color: var(--text-primary);
    font-size: 1.5rem;
}

.stats-grid {
    display: grid;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: var(--mdc-theme-surface);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-1);
}

.stat-card h4 {
    margin: 0 0 var(--spacing-md) 0;
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--text-primary);
}



.stat-card p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.stats-summary {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--divider-color);
}

.stats-summary h4 {
    margin: 0 0 var(--spacing-md) 0;
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--text-primary);
}



/* Material UI overrides */
.mdc-linear-progress {
    width: 100%;
    height: 4px;
}

.mdc-linear-progress__bar-inner {
    border-color: var(--mdc-theme-primary);
}

.mdc-linear-progress__buffer {
    background-color: var(--divider-color);
}

.mdc-button {
    text-transform: none;
    font-weight: 500;
    border-radius: var(--border-radius-md);
}

/* Dark mode button fixes */
[data-theme="dark"] .mdc-button--raised {
    color: var(--mdc-theme-on-primary) !important;
}

[data-theme="dark"] .mdc-button--raised .mdc-button__label {
    color: var(--mdc-theme-on-primary) !important;
}

.mdc-icon-button {
    color: var(--text-primary);
}

/* Text field overrides */
.mdc-text-field {
    width: 100%;
    max-width: 300px;
}

.mdc-text-field--focused .mdc-floating-label {
    color: var(--mdc-theme-background) !important;
}

.mdc-text-field--focused .mdc-notched-outline__leading,
.mdc-text-field--focused .mdc-notched-outline__notch,
.mdc-text-field--focused .mdc-notched-outline__trailing {
    border-color: var(--mdc-theme-on-surface) !important;
}

.mdc-text-field--focused .mdc-notched-outline__notch {
    border-top-color: var(--mdc-theme-on-surface) !important;
}

.mdc-text-field__input {
    color: var(--text-primary) !important;
}

.mdc-floating-label {
    color: var(--text-secondary) !important;
}

.mdc-notched-outline__leading,
.mdc-notched-outline__notch,
.mdc-notched-outline__trailing {
    border-color: var(--divider-color) !important;
}

/* Dark mode text field fixes */
[data-theme="dark"] .mdc-text-field__input {
    color: var(--text-primary) !important;
}

[data-theme="dark"] .mdc-floating-label {
    color: var(--text-secondary) !important;
}

[data-theme="dark"] .mdc-text-field--focused .mdc-floating-label {
    color: var(--mdc-theme-primary) !important;
}

/* Additional text field fixes */
.mdc-text-field--label-floating .mdc-floating-label {
    transform: translateY(-106%) scale(0.75) !important;
}

.mdc-text-field--focused .mdc-floating-label {
    transform: translateY(-106%) scale(0.75) !important;
}

.mdc-text-field--label-floating .mdc-notched-outline__notch {
    max-width: calc(133.3333333333% - 24px) !important;
}

.mdc-text-field--focused .mdc-notched-outline__notch {
    max-width: calc(133.3333333333% - 24px) !important;
}

/* Responsive design */
@media (max-width: 768px) {
    .main-content {
        padding: var(--spacing-md);
        margin-top: 56px;
    }
    
    .welcome-title {
        font-size: 2rem;
    }
    
    .welcome-subtitle {
        font-size: 1rem;
    }
    
    .character-set-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .character-set-card {
        padding: var(--spacing-lg);
    }
    
    .character-set-icon {
        font-size: 3rem;
    }
    
    .session-header {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
        padding: var(--spacing-md);
    }
    
    .session-info h2 {
        font-size: 1.25rem;
    }
    
    .session-stats {
        justify-content: center;
    }
    
    .japanese-character {
        font-size: 4rem;
    }
    
    .instruction p {
        font-size: 1rem;
    }
    
    .action-buttons {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .stats-modal {
        padding: var(--spacing-sm);
    }
    
    .stats-card {
        max-height: 90vh;
        margin: var(--spacing-sm);
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: var(--spacing-sm);
    }
    
    .card-content {
        padding: var(--spacing-md);
    }
    
    .welcome-title {
        font-size: 1.75rem;
    }
    
    .character-set-card {
        padding: var(--spacing-md);
    }
    
    .character-set-icon {
        font-size: 2.5rem;
    }
    
    .card-front, .card-back {
        padding: var(--spacing-md);
    }
    
    .japanese-character {
        font-size: 3rem;
    }
    
    .romaji {
        font-size: 1.25rem;
    }
    
    .english-meaning {
        font-size: 1.125rem;
    }
    
    .result-icon {
        font-size: 2.5rem;
    }
    
    .feedback-message {
        font-size: 1rem;
    }
    
    .input-container {
        gap: var(--spacing-md);
    }
    
    .mdc-text-field {
        max-width: 100%;
    }
}

/* Touch-friendly improvements */
@media (hover: none) and (pointer: coarse) {
    .character-set-card {
        min-height: 120px;
    }
    
    .mdc-button {
        min-height: 48px;
        padding: 12px 24px;
    }
    
    .mdc-icon-button {
        min-width: 48px;
        min-height: 48px;
    }
    
    .action-buttons {
        gap: var(--spacing-md);
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.welcome-screen,
.study-session {
    animation: fadeIn 0.6s ease-out;
}

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

.character-set-card:hover .character-set-icon {
    animation: pulse 0.6s ease-in-out;
}

/* Focus styles for accessibility */
.mdc-button:focus,
.mdc-icon-button:focus,
.character-set-card:focus {
    outline: 2px solid var(--mdc-theme-primary);
    outline-offset: 2px;
}

/* Loading states */
.loading {
    opacity: 0.7;
    pointer-events: none;
}

/* Print styles */
@media print {
    .mdc-top-app-bar,
    .session-header,
    .hint-container,
    .stats-modal {
        display: none;
    }
    
    .main-content {
        margin-top: 0;
        padding: 0;
    }
    
    .flashcard {
        box-shadow: none;
        border: 1px solid #ccc;
    }
}