/* ===== Root Variables ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
}

/* 터치 최적화 */
button, a, input, [role="button"], [role="link"] {
    touch-action: manipulation;
    -webkit-user-select: none;
    user-select: none;
}

input[type="text"], textarea {
    -webkit-user-select: text;
    user-select: text;
}

:root {
    --primary-color: #e056fd;
    --primary-dark: #d441e8;
    --primary-light: #f78dff;
    --success-color: #10b981;
    --success-dark: #059669;
    --danger-color: #ef4444;
    --danger-dark: #dc2626;
    --warning-color: #f59e0b;
    --bg-dark: #0f0f23;
    --bg-darker: #0a0a16;
    --surface: #1a1a2e;
    --surface-light: #252541;
    --text-primary: #ffffff;
    --text-secondary: #b0b8d4;
    --border-radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-darker) 100%);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* ===== Container ===== */
.container {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    padding: 0;
    position: relative;
}

/* ===== App Loader ===== */
.app-loader {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-darker) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.app-loader.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

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

.loader-emoji {
    font-size: 56px;
    margin-bottom: 16px;
    animation: bounce 1.4s infinite;
}

.loader-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(224, 86, 253, 0.2);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    margin: 16px auto;
    animation: spin 1s linear infinite;
}

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

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===== Ad Banners ===== */
.ad-banner {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: 12px;
    text-align: center;
    min-height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ad-top {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.ad-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
}

.ad-placeholder {
    display: inline-block;
    font-size: 12px;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.05);
    padding: 8px 16px;
    border-radius: 8px;
}

/* ===== Language Selector ===== */
.language-selector {
    position: fixed;
    top: 80px;
    right: 16px;
    z-index: 100;
}

.lang-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-primary);
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 18px;
    transition: var(--transition);
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lang-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: scale(1.05);
}

.lang-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--surface);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    margin-top: 8px;
    min-width: 160px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    z-index: 101;
}

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

.lang-option {
    display: block;
    width: 100%;
    padding: 12px 16px;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    text-align: left;
    font-size: 13px;
    transition: var(--transition);
}

.lang-option:hover {
    background: rgba(224, 86, 253, 0.1);
    color: var(--primary-color);
}

.lang-option:first-child {
    border-radius: 12px 12px 0 0;
}

.lang-option:last-child {
    border-radius: 0 0 12px 12px;
}

/* ===== App Header ===== */
.app-header {
    padding: 24px 16px 16px;
    text-align: center;
    background: rgba(224, 86, 253, 0.05);
    border-bottom: 1px solid rgba(224, 86, 253, 0.1);
}

.app-header h1 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 8px;
    background: linear-gradient(135deg, #e056fd, #f78dff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    margin: 0;
}

/* ===== Game Container ===== */
.game-container {
    padding-bottom: 60px;
}

/* ===== Screens ===== */
.screen {
    display: none;
    animation: fadeIn 0.3s ease-in;
}

.screen.active {
    display: block;
}

.screen.hidden {
    display: none !important;
}

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

/* ===== Intro Screen ===== */
.intro-content {
    padding: 24px 16px;
    max-width: 500px;
    margin: 0 auto;
}

.intro-icon {
    font-size: 56px;
    margin-bottom: 16px;
    display: block;
}

.intro-content h2 {
    font-size: 28px;
    margin-bottom: 8px;
}

.intro-desc {
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-size: 16px;
}

.difficulty-select {
    background: rgba(224, 86, 253, 0.08);
    border: 1px solid rgba(224, 86, 253, 0.2);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 24px;
}

.difficulty-select h3 {
    margin-bottom: 16px;
    font-size: 16px;
    font-weight: 600;
}

.difficulty-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.difficulty-btn {
    padding: 12px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 12px;
    font-weight: 600;
    transition: var(--transition);
    min-height: 44px;
}

.difficulty-btn:hover {
    background: rgba(224, 86, 253, 0.2);
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.how-to-play {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 24px;
}

.how-to-play h3 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 12px;
}

.steps {
    list-style: none;
    padding: 0;
    margin: 0;
}

.steps li {
    padding: 8px 0 8px 24px;
    position: relative;
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.steps li:before {
    content: counter(list-number);
    counter-increment: list-number;
    position: absolute;
    left: 0;
    top: 0;
    background: var(--primary-color);
    color: white;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: bold;
}

.steps {
    counter-reset: list-number;
}

.hint-guide {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 24px;
}

.hint-guide h3 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 12px;
}

.hint-items {
    display: flex;
    gap: 16px;
}

.hint-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
}

.hint-icon {
    font-size: 18px;
}

/* ===== Buttons ===== */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: var(--transition);
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 12px rgba(224, 86, 253, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(224, 86, 253, 0.4);
}

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

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

.btn-large {
    width: 100%;
    padding: 16px 24px;
    font-size: 16px;
    margin-top: 24px;
}

/* ===== Game Screen ===== */
.game-info-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    background: rgba(224, 86, 253, 0.05);
    border-bottom: 1px solid rgba(224, 86, 253, 0.1);
}

.game-stats {
    display: flex;
    gap: 24px;
}

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

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

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

.life-display {
    font-size: 24px;
    line-height: 1;
}

.word-info {
    padding: 20px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.category-badge {
    background: rgba(224, 86, 253, 0.2);
    color: var(--primary-light);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.timer-circle {
    width: 80px;
    height: 80px;
    position: relative;
}

.timer-circle svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.timer-bg {
    fill: none;
    stroke: rgba(224, 86, 253, 0.2);
    stroke-width: 4;
}

.timer-fill {
    fill: none;
    stroke: url(#timerGradient);
    stroke-width: 4;
    stroke-linecap: round;
    transition: stroke-dashoffset 0.1s linear;
    stroke-dasharray: 283;
    stroke-dashoffset: 0;
}

.timer-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
}

.word-area {
    padding: 20px 16px;
}

.scrambled-word {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-bottom: 20px;
    min-height: 60px;
    padding: 12px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
}

.letter-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 700;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    min-width: 44px;
}

.letter-btn:hover:not(:disabled) {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(224, 86, 253, 0.4);
}

.letter-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.hint-buttons {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-bottom: 20px;
}

.hint-btn {
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 18px;
    transition: var(--transition);
    min-height: 44px;
    min-width: 44px;
}

.hint-btn:hover:not(:disabled) {
    background: rgba(224, 86, 253, 0.2);
    border-color: var(--primary-color);
}

.hint-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.answer-area {
    padding: 16px;
    background: rgba(224, 86, 253, 0.08);
    border: 2px dashed rgba(224, 86, 253, 0.3);
    border-radius: 12px;
    min-height: 60px;
    margin-bottom: 20px;
}

.answer-display {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    align-items: center;
}

.answer-letter {
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: white;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition);
    min-height: 44px;
    min-width: 44px;
}

.answer-letter:hover {
    transform: scale(1.1);
    filter: brightness(1.2);
}

.action-buttons {
    display: flex;
    gap: 12px;
    padding: 0 16px;
}

.action-buttons .btn {
    flex: 1;
}

/* ===== Result Screen ===== */
.result-content,
.gameover-content {
    padding: 24px 16px;
    max-width: 500px;
    margin: 0 auto;
}

.result-icon,
.gameover-icon {
    font-size: 56px;
    text-align: center;
    margin-bottom: 16px;
    display: block;
    animation: bounce 1s ease-in-out;
}

.result-content h2,
.gameover-content h2 {
    font-size: 28px;
    text-align: center;
    margin-bottom: 24px;
}

.result-card,
.gameover-stats {
    background: rgba(224, 86, 253, 0.08);
    border: 1px solid rgba(224, 86, 253, 0.2);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 24px;
}

.result-stat {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.result-stat:last-child {
    border-bottom: none;
}

.result-stat .label {
    color: var(--text-secondary);
    font-size: 14px;
}

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

.stat-box {
    text-align: center;
    padding: 16px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    margin-bottom: 12px;
}

.stat-box:last-child {
    margin-bottom: 0;
}

.stat-title {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.stat-large {
    display: block;
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-color);
}

.gameover-stats {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 12px;
    padding: 16px;
}

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

.premium-btn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, rgba(224, 86, 253, 0.3), rgba(212, 65, 232, 0.2));
    border: 1px solid var(--primary-color);
    border-radius: 12px;
    color: var(--primary-light);
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 44px;
}

.premium-btn:hover {
    background: linear-gradient(135deg, rgba(224, 86, 253, 0.4), rgba(212, 65, 232, 0.3));
    transform: translateY(-2px);
}

.premium-badge {
    background: var(--primary-color);
    color: white;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 10px;
    font-weight: 700;
}

.ad-result-area,
.ad-gameover-area {
    padding: 16px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    margin-bottom: 24px;
    text-align: center;
    min-height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.result-content .btn,
.gameover-content .btn {
    width: 100%;
    margin-bottom: 12px;
}

.result-content .btn:last-child,
.gameover-content .btn:last-child {
    margin-bottom: 0;
}

/* ===== Modal ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    backdrop-filter: blur(4px);
}

.modal.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.modal-content {
    background: var(--surface);
    border-radius: 16px;
    padding: 24px;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.modal-header h3 {
    margin: 0;
    font-size: 18px;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 24px;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--primary-color);
    transform: rotate(90deg);
}

.modal-body {
    margin-bottom: 16px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.modal-body h4 {
    color: var(--text-primary);
    margin-top: 12px;
    margin-bottom: 8px;
    font-size: 14px;
}

.modal-body p {
    margin-bottom: 8px;
    font-size: 13px;
}

.premium-modal-content {
    max-width: 450px;
}

/* ===== Recommendations Section ===== */
.recommendations-section {
    padding: 24px 16px;
    background: rgba(224, 86, 253, 0.05);
    border-top: 1px solid rgba(224, 86, 253, 0.1);
    border-bottom: 1px solid rgba(224, 86, 253, 0.1);
    margin-top: 24px;
}

.rec-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    text-align: center;
}

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

.rec-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

.rec-card:hover {
    background: rgba(224, 86, 253, 0.15);
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.rec-icon {
    font-size: 24px;
    flex-shrink: 0;
}

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

.rec-name {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 4px;
}

.rec-desc {
    display: block;
    font-size: 11px;
    color: var(--text-secondary);
}

/* ===== Footer ===== */
.game-footer {
    padding: 24px 16px;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.back-link:hover {
    color: var(--primary-color);
    transform: translateX(-4px);
}

/* ===== Responsive Design ===== */
@media (max-width: 480px) {
    .language-selector {
        top: 60px;
        right: 8px;
    }

    .app-header h1 {
        font-size: 24px;
    }

    .intro-content {
        padding: 16px;
    }

    .difficulty-buttons {
        grid-template-columns: 1fr;
    }

    .game-stats {
        gap: 16px;
        font-size: 12px;
    }

    .result-content,
    .gameover-content {
        padding: 16px;
    }

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

    .modal-content {
        width: 95%;
        padding: 16px;
    }

    .stat-value {
        font-size: 18px;
    }

    .stat-large {
        font-size: 28px;
    }

    .timer-circle {
        width: 60px;
        height: 60px;
    }

    .timer-text {
        font-size: 18px;
    }
}

@media (max-width: 360px) {
    body {
        font-size: 13px;
    }

    .app-header h1 {
        font-size: 20px;
    }

    .subtitle {
        font-size: 12px;
    }

    .game-stats {
        gap: 12px;
    }

    .stat-value {
        font-size: 16px;
    }

    .result-content h2,
    .gameover-content h2 {
        font-size: 22px;
    }

    .result-icon,
    .gameover-icon {
        font-size: 48px;
    }

    .letter-btn {
        width: 36px;
        height: 36px;
        font-size: 14px;
    }

    .answer-letter {
        width: 36px;
        height: 36px;
        font-size: 14px;
    }
}

/* ===== Dark Mode (already default) ===== */
@media (prefers-color-scheme: dark) {
    /* Already dark mode by default */
}

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

@media (max-width: 600px) {
    body {
        padding-bottom: 60px;
    }

    .ad-bottom {
        height: auto;
    }
}

/* ===== Print Styles ===== */
@media print {
    .ad-banner,
    .language-selector,
    .game-footer,
    .recommendations-section {
        display: none;
    }
}

/* === Keyboard Focus Accessibility === */
button:focus-visible,
a:focus-visible,
input:focus-visible,
[role="button"]:focus-visible,
[role="link"]:focus-visible {
    outline: 3px solid currentColor;
    outline-offset: 2px;
}

/* Remove default outline only if custom one provided */
button:focus-visible,
a:focus-visible,
input:focus-visible {
    outline: 3px solid #9b59b6;
    outline-offset: 2px;
}

/* Tab key only focus style */
button:focus:not(:focus-visible),
a:focus:not(:focus-visible),
input:focus:not(:focus-visible) {
    outline: none;
}

/* High contrast mode support */
@media (prefers-contrast: more) {
    button, input, a[href], [role="button"] {
        border: 2px solid currentColor;
    }
}

/* Enhanced button accessibility */
button:focus-visible,
input[type="button"]:focus-visible,
input[type="submit"]:focus-visible,
[role="button"]:focus-visible {
    outline: 3px solid currentColor;
    outline-offset: 2px;
}

button:active,
input[type="button"]:active,
input[type="submit"]:active,
[role="button"]:active {
    transform: scale(0.98);
}

/* High contrast mode */
@media (prefers-contrast: more) {
    button,
    input[type="button"],
    input[type="submit"],
    [role="button"] {
        border: 2px solid currentColor;
        font-weight: bold;
    }
}

/* Enhanced form accessibility */
label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
textarea,
select {
    font-size: 16px;
    min-height: 44px;
    padding: 10px 12px;
}

input[type="text"]:focus-visible,
input[type="email"]:focus-visible,
input[type="password"]:focus-visible,
input[type="number"]:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 2px solid currentColor;
    outline-offset: 1px;
}

/* Error handling accessibility */
.error-message,
[aria-invalid="true"] {
    color: #dc2626;
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

[aria-invalid="true"] {
    border-color: #dc2626;
}

/* Non-color focus indicators */
:focus-visible {
    outline-width: 3px;
}

/* Icon patterns for colorblind users */
.error::before {
    content: "x ";
}

.success::before {
    content: "✓ ";
}

.warning::before {
    content: "! ";
}

.info::before {
    content: "i ";
}

/* High contrast scrollbar */
::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark, #f1f5f9);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color, #3b82f6);
    border-radius: 6px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark, #1e40af);
}

/* Firefox scrollbar */
* {
    scrollbar-color: var(--primary-color, #3b82f6) var(--bg-dark, #f1f5f9);
    scrollbar-width: thin;
}

/* Selection Color */
::selection {
    background: #e056fd;
    color: white;
}

::-moz-selection {
    background: #e056fd;
    color: white;
}

/* ============================================
   Light Mode Theme
   ============================================ */
[data-theme="light"] {
    --bg-dark: #f5f5fa;
    --bg-darker: #ffffff;
    --surface: #ffffff;
    --surface-light: #f5f5f5;
    --text-primary: #1a1a2e;
    --text-secondary: #5a5a70;
}

[data-theme="light"] body {
    background: linear-gradient(135deg, #f5f5fa 0%, #ffffff 100%);
}

[data-theme="light"] .app-loader {
    background: linear-gradient(135deg, #f5f5fa 0%, #ffffff 100%);
}

[data-theme="light"] .ad-banner {
    background: rgba(255, 255, 255, 0.9);
    border-bottom-color: rgba(0, 0, 0, 0.1);
    border-top-color: rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .lang-menu {
    background: var(--surface);
    border-color: rgba(0, 0, 0, 0.1);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .lang-option {
    color: var(--text-primary);
}

[data-theme="light"] .lang-option:hover {
    background: rgba(224, 86, 253, 0.1);
    color: var(--primary-color);
}

[data-theme="light"] .app-header {
    background: rgba(255, 255, 255, 0.95);
    border-bottom-color: rgba(224, 86, 253, 0.1);
}

[data-theme="light"] .difficulty-select {
    background: rgba(224, 86, 253, 0.05);
    border-color: rgba(224, 86, 253, 0.15);
}

[data-theme="light"] .difficulty-btn {
    background: rgba(255, 255, 255, 0.8);
    border-color: rgba(0, 0, 0, 0.1);
    color: var(--text-primary);
}

[data-theme="light"] .difficulty-btn:hover {
    background: rgba(224, 86, 253, 0.15);
    border-color: var(--primary-color);
}

[data-theme="light"] .how-to-play,
[data-theme="light"] .hint-guide {
    background: rgba(255, 255, 255, 0.8);
}

[data-theme="light"] .game-info-bar {
    background: rgba(224, 86, 253, 0.05);
    border-bottom-color: rgba(224, 86, 253, 0.1);
}

[data-theme="light"] .category-badge {
    background: rgba(224, 86, 253, 0.15);
    color: var(--primary-dark);
}

[data-theme="light"] .scrambled-word {
    background: rgba(255, 255, 255, 0.8);
}

[data-theme="light"] .hint-btn {
    background: rgba(255, 255, 255, 0.8);
    border-color: rgba(0, 0, 0, 0.1);
    color: var(--text-primary);
}

[data-theme="light"] .hint-btn:hover:not(:disabled) {
    background: rgba(224, 86, 253, 0.15);
    border-color: var(--primary-color);
}

[data-theme="light"] .answer-area {
    background: rgba(224, 86, 253, 0.05);
    border-color: rgba(224, 86, 253, 0.2);
}

[data-theme="light"] .btn-secondary {
    background: rgba(255, 255, 255, 0.8);
    border-color: rgba(0, 0, 0, 0.1);
    color: var(--text-primary);
}

[data-theme="light"] .btn-secondary:hover {
    background: rgba(0, 0, 0, 0.05);
    border-color: rgba(0, 0, 0, 0.2);
}

[data-theme="light"] .result-card,
[data-theme="light"] .gameover-stats {
    background: rgba(224, 86, 253, 0.05);
    border-color: rgba(224, 86, 253, 0.15);
}

[data-theme="light"] .result-stat {
    border-bottom-color: rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .stat-box {
    background: rgba(255, 255, 255, 0.8);
}

[data-theme="light"] .premium-section {
    background: linear-gradient(135deg, rgba(224, 86, 253, 0.1) 0%, rgba(247, 141, 255, 0.05) 100%);
    border-color: rgba(224, 86, 253, 0.2);
}

[data-theme="light"] .ad-result-area,
[data-theme="light"] .ad-gameover-area {
    background: rgba(255, 255, 255, 0.8);
}

[data-theme="light"] .modal-content {
    background: var(--surface);
    border-color: rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .recommendations-section {
    background: rgba(224, 86, 253, 0.05);
    border-top-color: rgba(224, 86, 253, 0.1);
    border-bottom-color: rgba(224, 86, 253, 0.1);
}

[data-theme="light"] .rec-card {
    background: rgba(255, 255, 255, 0.8);
    border-color: rgba(0, 0, 0, 0.1);
    color: var(--text-primary);
}

[data-theme="light"] .rec-card:hover {
    background: rgba(224, 86, 253, 0.1);
    border-color: var(--primary-color);
}

[data-theme="light"] .game-footer {
    border-top-color: rgba(0, 0, 0, 0.1);
}

/* Theme Toggle Button */
.theme-toggle {
    position: fixed;
    top: 12px;
    right: 56px;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 18px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

[data-theme="light"] .theme-toggle {
    background: rgba(26, 26, 46, 0.1);
    border-color: rgba(26, 26, 46, 0.15);
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.05);
}

[data-theme="light"] .theme-toggle:hover {
    background: rgba(26, 26, 46, 0.15);
}

.theme-toggle:active {
    transform: scale(0.95);
}

/* Keyboard shortcut hints */
.keyboard-hints {
    display: none;
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px 14px;
    padding: 8px 16px;
    margin-top: 8px;
    font-size: 11px;
    color: var(--text-secondary);
}
@media (min-width: 768px) {
    .keyboard-hints { display: flex; }
}
.kbd-hint { white-space: nowrap; }
.kbd-hint kbd {
    display: inline-block;
    padding: 1px 5px;
    border: 1px solid rgba(224, 86, 253, 0.25);
    border-radius: 3px;
    background: rgba(224, 86, 253, 0.08);
    font-family: inherit;
    font-size: 10px;
    line-height: 1.4;
    color: var(--text-secondary);
}