/* Chinese Character Learning - Mobile-First Styles */

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

:root {
    --primary-color: #e74c3c;
    --primary-dark: #c0392b;
    --secondary-color: #3498db;
    --background: #1a1a2e;
    --surface: #16213e;
    --surface-light: #0f3460;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --accent-gold: #f1c40f;
    --success: #2ecc71;
    --error: #e74c3c;
}

html, body {
    height: 100%;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

/* Game Container - Full viewport */
.game-container {
    display: flex;
    flex-direction: column;
    height: 100dvh;
    height: 100vh;
    max-width: 600px;
    margin: 0 auto;
    position: relative;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--surface);
    border-bottom: 1px solid var(--surface-light);
    flex-shrink: 0;
}

.home-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: var(--surface-light);
    border-radius: 12px;
    text-decoration: none;
    font-size: 1.4rem;
}

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

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

.hsk-dropdown {
    padding: 10px 16px;
    font-size: 1rem;
    font-weight: 600;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
}

.icon-btn {
    width: 44px;
    height: 44px;
    font-size: 1.3rem;
    background: var(--surface-light);
    border: none;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:active {
    transform: scale(0.95);
    background: var(--surface);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: 16px;
    gap: 16px;
}

/* Character Area */
.character-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    flex-shrink: 0;
}

.character-canvas {
    width: 250px;
    height: 250px;
    background: var(--surface);
    border-radius: 20px;
    border: 3px solid var(--surface-light);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

/* Stroke Number Overlay */
.stroke-number-overlay {
    position: absolute;
    top: 10px;
    left: 10px;
    background: rgba(0, 0, 0, 0.7);
    padding: 8px 14px;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 2px;
    opacity: 0;
    transform: scale(0.8);
    transition: opacity 0.2s, transform 0.2s;
    z-index: 10;
}

.stroke-number-overlay.visible {
    opacity: 1;
    transform: scale(1);
}

.stroke-current {
    color: var(--accent-gold);
    font-size: 1.3rem;
}

.stroke-separator {
    color: var(--text-secondary);
    margin: 0 2px;
}

.stroke-total {
    color: var(--text-secondary);
}

/* Start Point Indicator */
.stroke-start-indicator {
    position: absolute;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--accent-gold);
    opacity: 0.8;
    transform: translate(-50%, -50%);
    animation: pulseStart 1.2s ease-in-out infinite;
    z-index: 5;
    pointer-events: none;
}

.stroke-start-indicator::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 8px;
    height: 8px;
    background: white;
    border-radius: 50%;
    transform: translate(-50%, -50%);
}

@keyframes pulseStart {
    0%, 100% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 0.8;
    }
    50% {
        transform: translate(-50%, -50%) scale(1.3);
        opacity: 0.5;
    }
}

/* Direction Arrow */
.stroke-direction-arrow {
    position: absolute;
    font-size: 1.5rem;
    color: var(--accent-gold);
    transform: translate(-50%, -50%);
    z-index: 6;
    pointer-events: none;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    animation: bounceArrow 0.8s ease-in-out infinite;
}

@keyframes bounceArrow {
    0%, 100% {
        transform: translate(-50%, -50%) translateY(0);
    }
    50% {
        transform: translate(-50%, -50%) translateY(-5px);
    }
}

/* Info Panel */
.info-panel {
    text-align: center;
    width: 100%;
    max-width: 350px;
}

.info-row {
    margin-bottom: 8px;
}

.info-row.primary {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    font-size: 1.4rem;
    font-weight: 600;
}

.pinyin, .jyutping {
    cursor: pointer;
    padding: 6px 12px;
    border-radius: 8px;
    transition: background 0.2s, transform 0.1s;
}

.pinyin {
    color: var(--primary-color);
}

.pinyin:hover, .pinyin:active {
    background: rgba(231, 76, 60, 0.2);
}

.pinyin.active-dialect {
    background: rgba(231, 76, 60, 0.3);
    box-shadow: 0 0 0 2px var(--primary-color);
}

.jyutping {
    color: var(--secondary-color);
}

.jyutping:hover, .jyutping:active {
    background: rgba(52, 152, 219, 0.2);
}

.jyutping.active-dialect {
    background: rgba(52, 152, 219, 0.3);
    box-shadow: 0 0 0 2px var(--secondary-color);
}

.pinyin:active, .jyutping:active {
    transform: scale(0.95);
}

.separator {
    color: var(--text-secondary);
    opacity: 0.5;
}

.info-row.secondary {
    font-size: 1.1rem;
    color: var(--text-primary);
    padding: 8px 0;
}

.info-row.tertiary {
    display: flex;
    justify-content: center;
    gap: 16px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    justify-content: center;
    gap: 8px;
    flex-shrink: 0;
    flex-wrap: wrap;
}

.action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 12px 16px;
    font-size: 0.9rem;
    font-weight: 600;
    background: var(--surface-light);
    color: var(--text-primary);
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: transform 0.1s, background 0.2s;
}

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

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

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

.action-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-icon {
    font-size: 1.2rem;
}

/* Character Grid */
.character-grid-container {
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 8px;
    padding-bottom: max(24px, calc(env(safe-area-inset-bottom) + 16px));
    background: var(--surface);
    border-radius: 16px;
    margin-top: 8px;
}

.character-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(50px, 1fr));
    gap: 8px;
    padding: 4px;
    margin-bottom: 16px;
}

.char-cell {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    background: var(--surface);
    border: 2px solid var(--surface-light);
    border-radius: 10px;
    cursor: pointer;
    transition: transform 0.1s, border-color 0.2s;
}

.char-cell:active {
    transform: scale(0.95);
}

.char-cell.selected {
    border-color: var(--primary-color);
    background: var(--surface-light);
}

.char-cell.completed {
    border-color: var(--success);
    position: relative;
}

.char-cell.completed::after {
    content: '✓';
    position: absolute;
    top: 2px;
    right: 4px;
    font-size: 0.7rem;
    color: var(--success);
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--surface);
    border-radius: 20px;
    width: 100%;
    max-width: 400px;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid var(--surface-light);
}

.modal-header h2 {
    font-size: 1.3rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.chinese-title {
    font-size: 1rem;
    color: var(--text-secondary);
}

.close-btn {
    width: 36px;
    height: 36px;
    font-size: 1.5rem;
    background: var(--surface-light);
    border: none;
    border-radius: 50%;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-body {
    padding: 20px;
}

/* Stroke Grid in Help Modal */
.stroke-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}

.stroke-card {
    aspect-ratio: 1;
    background: var(--surface-light);
    border: 2px solid transparent;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: border-color 0.2s, transform 0.1s;
    padding: 8px;
}

.stroke-card:active {
    transform: scale(0.95);
}

.stroke-card.selected {
    border-color: var(--primary-color);
}

.stroke-symbol {
    font-size: 1.8rem;
    margin-bottom: 4px;
}

.stroke-chinese {
    font-size: 1rem;
    font-weight: 600;
}

.stroke-pinyin {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.stroke-detail {
    background: var(--surface-light);
    border-radius: 12px;
    padding: 16px;
    min-height: 100px;
}

.stroke-detail .hint {
    color: var(--text-secondary);
    text-align: center;
    font-style: italic;
}

.stroke-detail .detail-content {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.stroke-detail .detail-name {
    font-size: 1.2rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.stroke-detail .detail-desc {
    color: var(--text-secondary);
    line-height: 1.5;
}

.stroke-detail .detail-example {
    margin-top: 8px;
    font-size: 0.9rem;
}

.stroke-detail .example-char {
    font-size: 2rem;
    margin-left: 10px;
}

/* Settings */
.setting-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid var(--surface-light);
}

.setting-row:last-child {
    border-bottom: none;
}

.setting-row label {
    font-size: 1rem;
}

.setting-row input[type="range"] {
    width: 100px;
    accent-color: var(--primary-color);
}

.setting-row input[type="checkbox"] {
    width: 24px;
    height: 24px;
    accent-color: var(--primary-color);
}

.setting-row span {
    min-width: 30px;
    text-align: center;
    font-weight: 600;
}

/* Slider with labels */
.slider-with-labels {
    display: flex;
    align-items: center;
    gap: 8px;
}

.slider-label-left,
.slider-label-right {
    font-size: 0.75rem;
    color: var(--text-secondary);
    min-width: auto !important;
}

.slider-with-labels input[type="range"] {
    width: 80px;
}

/* Celebration */
.celebration {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    animation: fadeIn 0.3s ease-out;
}

.celebration.hidden {
    display: none;
}

.celebration-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    animation: bounceIn 0.5s ease-out;
}

.celebration-emoji {
    font-size: 5rem;
}

.celebration-text {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-gold);
}

.celebration-buttons {
    display: flex;
    gap: 16px;
    margin-top: 20px;
}

.celebration-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.option-char {
    font-size: 2.2rem;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.celebration-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px 20px;
    font-size: 1rem;
    font-weight: 600;
    color: white;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: transform 0.1s, background 0.2s;
    min-width: 90px;
}

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

.celebration-btn.prev {
    background: var(--surface-light);
}

.celebration-btn.prev:hover {
    background: var(--surface);
}

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

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

.celebration-btn.next {
    background: var(--success);
}

.celebration-btn.next:hover {
    background: #27ae60;
}

.celebration-hint {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.6);
    margin-top: 12px;
}

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

@keyframes bounceIn {
    0% { transform: scale(0.3); opacity: 0; }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); opacity: 1; }
}

/* Quiz Mode Feedback */
.quiz-feedback {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    animation: slideUp 0.3s ease-out;
}

.quiz-feedback.correct {
    background: var(--success);
    color: white;
}

.quiz-feedback.incorrect {
    background: var(--error);
    color: white;
}

@keyframes slideUp {
    from {
        transform: translateX(-50%) translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateX(-50%) translateY(0);
        opacity: 1;
    }
}

/* Responsive adjustments */
@media (min-width: 400px) {
    .character-canvas {
        width: 280px;
        height: 280px;
    }

    .character-grid {
        grid-template-columns: repeat(auto-fill, minmax(55px, 1fr));
    }
}

@media (min-width: 500px) {
    .character-canvas {
        width: 300px;
        height: 300px;
    }

    .character-grid {
        grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
    }
}

/* Safe area for iOS */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
    .game-container {
        padding-bottom: env(safe-area-inset-bottom);
    }
}

/* Main Menu */
.main-menu {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--background);
    z-index: 3000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.main-menu.hidden {
    display: none;
}

.menu-title {
    text-align: center;
    margin-bottom: 40px;
}

.menu-title h1 {
    font-size: 2.5rem;
    margin-bottom: 8px;
}

.menu-title .subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
}

.menu-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    max-width: 320px;
    width: 100%;
}

.menu-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 24px 16px;
    background: var(--surface);
    border: 2px solid var(--surface-light);
    border-radius: 16px;
    cursor: pointer;
    transition: transform 0.1s, border-color 0.2s, background 0.2s;
    text-decoration: none;
    color: var(--text-primary);
}

.menu-item:active {
    transform: scale(0.95);
}

.menu-item:hover {
    border-color: var(--primary-color);
    background: var(--surface-light);
}

.menu-icon {
    font-size: 2.5rem;
}

.menu-label {
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
}

.menu-streak {
    margin-top: 30px;
    font-size: 1rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.menu-streak .streak-fire {
    color: #f39c12;
}

/* Groups View */
.groups-view {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--background);
    z-index: 2500;
    display: flex;
    flex-direction: column;
    padding: 20px;
}

.groups-view.hidden {
    display: none;
}

.groups-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.groups-back-btn {
    width: 44px;
    height: 44px;
    font-size: 1.3rem;
    background: var(--surface-light);
    border: none;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
}

.groups-title {
    font-size: 1.5rem;
    font-weight: 600;
}

.groups-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    overflow-y: auto;
    flex: 1;
}

.group-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 24px 16px;
    background: var(--surface);
    border: 2px solid var(--surface-light);
    border-radius: 16px;
    cursor: pointer;
    transition: transform 0.1s, border-color 0.2s;
}

.group-card:active {
    transform: scale(0.95);
}

.group-card:hover {
    border-color: var(--secondary-color);
}

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

.group-name {
    font-size: 1rem;
    font-weight: 600;
}

.group-name-zh {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.group-count {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Daily Mode Progress */
.daily-progress {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: var(--surface);
    border-radius: 12px;
    margin-bottom: 16px;
}

.daily-progress.hidden {
    display: none;
}

.daily-progress-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.daily-progress-bar {
    width: 100%;
    max-width: 300px;
    height: 8px;
    background: var(--surface-light);
    border-radius: 4px;
    overflow: hidden;
}

.daily-progress-fill {
    height: 100%;
    background: var(--success);
    border-radius: 4px;
    transition: width 0.3s ease;
}

.daily-streak {
    font-size: 0.85rem;
    color: var(--accent-gold);
}