/* ========================
   Memory Card Flip - Styles
   ======================== */

* {
    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: #e67e22;
    --primary-dark: #d35400;
    --secondary-color: #3498db;
    --accent-color: #f39c12;
    --success-color: #2ecc71;
    --danger-color: #e74c3c;
    --dark-bg: #0f0f23;
    --dark-surface: #1a1a2e;
    --dark-surface-light: #16213e;
    --dark-border: #2a2a3e;
    --light-text: #ffffff;
    --muted-text: #a0a0b0;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --card-flip-duration: 0.6s;
}

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, var(--dark-bg) 0%, #1f1f35 100%);
    color: var(--light-text);
    min-height: 100vh;
    overflow-x: hidden;
}

/* === App Loader === */
.app-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--dark-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

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

.loader-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.loader-emoji {
    font-size: 60px;
    animation: loader-bounce 1s ease-in-out infinite;
    will-change: transform;
}

.loader-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(230, 126, 34, 0.1);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: loader-spin 0.8s linear infinite;
    will-change: transform;
}

.loader-text {
    font-size: 14px;
    color: var(--muted-text);
    letter-spacing: 1px;
    font-weight: 500;
}

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

@keyframes loader-bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

/* === Container === */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 12px;
    position: relative;
}

/* === Header === */
.header {
    margin-bottom: 20px;
    border-radius: 16px;
    overflow: hidden;
    background: rgba(26, 26, 46, 0.7);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(230, 126, 34, 0.2);
    padding: 16px;
    animation: slideDown 0.6s ease;
}

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

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    gap: 12px;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.header-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.header-btn {
    width: 44px;
    height: 44px;
    border: none;
    background: rgba(230, 126, 34, 0.15);
    border-radius: 12px;
    color: var(--light-text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: all 0.3s ease;
    border: 1px solid rgba(230, 126, 34, 0.2);
}

.header-btn:hover {
    background: rgba(230, 126, 34, 0.25);
    border-color: rgba(230, 126, 34, 0.4);
}

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

/* Sound Toggle */
.sound-toggle {
    width: 44px;
    height: 44px;
    border: 1px solid rgba(230, 126, 34, 0.2);
    background: rgba(230, 126, 34, 0.15);
    border-radius: 12px;
    color: var(--light-text);
    cursor: pointer;
    font-size: 20px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sound-toggle:hover {
    background: rgba(230, 126, 34, 0.25);
    border-color: rgba(230, 126, 34, 0.4);
}

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

/* Language Selector */
.language-selector {
    position: relative;
}

.lang-toggle {
    width: 44px;
    height: 44px;
    border: 1px solid rgba(230, 126, 34, 0.2);
    background: rgba(230, 126, 34, 0.15);
    border-radius: 12px;
    color: var(--light-text);
    cursor: pointer;
    font-size: 18px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lang-toggle:hover {
    background: rgba(230, 126, 34, 0.25);
    border-color: rgba(230, 126, 34, 0.4);
}

.lang-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background: var(--dark-surface);
    border: 1px solid var(--dark-border);
    border-radius: 12px;
    overflow: hidden;
    min-width: 140px;
    box-shadow: var(--shadow);
    z-index: 100;
    animation: slideDown 0.3s ease;
}

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

.lang-option {
    width: 100%;
    padding: 12px 16px;
    border: none;
    background: transparent;
    color: var(--light-text);
    cursor: pointer;
    text-align: left;
    font-size: 13px;
    transition: background-color 0.2s ease;
    border-bottom: 1px solid var(--dark-border);
}

.lang-option:last-child {
    border-bottom: none;
}

.lang-option:hover {
    background: rgba(230, 126, 34, 0.2);
}

.lang-option.active {
    background: rgba(230, 126, 34, 0.3);
    color: var(--primary-color);
}

/* Stats Bar */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 12px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 12px;
    background: rgba(230, 126, 34, 0.1);
    border-radius: 12px;
    border: 1px solid rgba(230, 126, 34, 0.15);
}

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

.stat-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
}

.combo-value {
    color: var(--accent-color);
}

/* Game Info Bar */
.game-info-bar {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.timer-display,
.attempts-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 8px 12px;
    background: rgba(230, 126, 34, 0.05);
    border-radius: 8px;
    border: 1px solid rgba(230, 126, 34, 0.1);
}

.timer-label,
.attempts-label {
    font-size: 11px;
    color: var(--muted-text);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.timer-value,
.attempts-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--light-text);
    font-family: 'Courier New', monospace;
}

/* === Ad Container === */
.ad-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 90px;
    margin: 20px 0;
    background: rgba(26, 26, 46, 0.5);
    border-radius: 12px;
    border: 1px solid var(--dark-border);
    padding: 8px;
}

.ad-container.ad-top {
    animation: slideDown 0.8s ease 0.2s backwards;
}

.ad-container.ad-bottom {
    animation: slideUp 0.8s ease backwards;
}

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

/* === Game Container === */
.game-container {
    min-height: 500px;
    position: relative;
    margin: 20px 0;
}

.game-screen {
    display: none;
    animation: fadeIn 0.4s ease;
}

.game-screen.active {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Start Screen */
.start-content {
    width: 100%;
    max-width: 500px;
    text-align: center;
    animation: slideUp 0.6s ease;
}

.start-title {
    font-size: 28px;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

.start-description {
    font-size: 14px;
    color: var(--muted-text);
    margin-bottom: 24px;
    line-height: 1.6;
}

.theme-selector,
.difficulty-selector {
    margin-bottom: 24px;
    padding: 20px;
    background: rgba(230, 126, 34, 0.08);
    border-radius: 12px;
    border: 1px solid rgba(230, 126, 34, 0.15);
}

.selector-label {
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--primary-color);
    margin-bottom: 12px;
    display: block;
}

.theme-buttons,
.difficulty-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 8px;
}

.theme-btn,
.difficulty-btn {
    padding: 12px 8px;
    border: 2px solid var(--dark-border);
    background: rgba(26, 26, 46, 0.5);
    border-radius: 10px;
    color: var(--light-text);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 500;
}

.theme-btn:hover,
.difficulty-btn:hover {
    border-color: rgba(230, 126, 34, 0.3);
    background: rgba(230, 126, 34, 0.1);
}

.theme-btn.active,
.difficulty-btn.active {
    border-color: var(--primary-color);
    background: rgba(230, 126, 34, 0.2);
    color: var(--primary-color);
    box-shadow: 0 0 12px rgba(230, 126, 34, 0.3);
}

.theme-icon,
.difficulty-icon {
    font-size: 20px;
}

.theme-name,
.difficulty-name {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

/* Game Playing Screen */
.card-grid {
    display: grid;
    grid-auto-flow: row;
    gap: 10px;
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
    perspective: 1000px;
}

/* Difficulty-specific grid layouts */
.card-grid.grid-4x3 {
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(3, 1fr);
}

.card-grid.grid-4x4 {
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(4, 1fr);
}

.card-grid.grid-5x4 {
    grid-template-columns: repeat(5, 1fr);
    grid-template-rows: repeat(4, 1fr);
}

.card-grid.grid-6x5 {
    grid-template-columns: repeat(6, 1fr);
    grid-template-rows: repeat(5, 1fr);
    max-width: 500px;
}

/* Memory Card */
.memory-card {
    aspect-ratio: 1 / 1;
    perspective: 1000px;
    cursor: pointer;
    position: relative;
    touch-action: manipulation;
    min-height: 60px;
}

.memory-card.disabled {
    cursor: not-allowed;
}

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform var(--card-flip-duration) cubic-bezier(0.68, -0.55, 0.265, 1.55);
    transform-style: preserve-3d;
}

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

.card-face {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    border: 2px solid rgba(230, 126, 34, 0.3);
    font-weight: 700;
    font-size: 28px;
}

.card-back {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    box-shadow: 0 4px 12px rgba(230, 126, 34, 0.2);
    overflow: hidden;
}

.card-back::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.1) 50%, transparent 70%);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.card-back-icon {
    font-size: 28px;
    position: relative;
    z-index: 1;
    animation: pulse 2s ease-in-out infinite;
}

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

.card-front {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1), 0 4px 12px rgba(0, 0, 0, 0.15);
    color: var(--dark-bg);
    transform: rotateY(180deg);
}

.card-content {
    font-size: 32px;
    position: relative;
    z-index: 1;
}

.memory-card.matched .card-back {
    animation: matchPulse 0.4s ease-out;
}

@keyframes matchPulse {
    0% { transform: scale(1) rotateZ(0deg); }
    50% { transform: scale(1.05) rotateZ(5deg); }
    100% { transform: scale(1) rotateZ(0deg); }
}

.memory-card.matched .card-inner {
    pointer-events: none;
}

.memory-card.error .card-inner {
    animation: shake 0.5s ease;
}

@keyframes shake {
    0%, 100% { transform: rotateY(180deg) rotateZ(0deg); }
    25% { transform: rotateY(180deg) rotateZ(-2deg); }
    75% { transform: rotateY(180deg) rotateZ(2deg); }
}

/* Pause Screen */
.pause-content {
    text-align: center;
    animation: slideUp 0.4s ease;
}

.pause-content h2 {
    font-size: 32px;
    margin-bottom: 24px;
    color: var(--primary-color);
}

.pause-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 24px;
    max-width: 400px;
}

.pause-stat {
    padding: 16px;
    background: rgba(230, 126, 34, 0.1);
    border-radius: 10px;
    border: 1px solid rgba(230, 126, 34, 0.2);
}

.pause-stat .label {
    display: block;
    font-size: 12px;
    color: var(--muted-text);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
    font-weight: 600;
}

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

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

/* Stage Clear Screen */
.stage-clear-content {
    text-align: center;
    max-width: 450px;
    animation: slideUp 0.4s ease;
}

.clear-title {
    font-size: 36px;
    margin-bottom: 24px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

.clear-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-bottom: 24px;
}

.clear-stat {
    padding: 16px;
    background: rgba(230, 126, 34, 0.1);
    border-radius: 10px;
    border: 1px solid rgba(230, 126, 34, 0.2);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.clear-stat.highlight {
    grid-column: 1 / -1;
    background: rgba(230, 126, 34, 0.2);
    border-color: rgba(230, 126, 34, 0.4);
}

.clear-stat .label {
    font-size: 12px;
    color: var(--muted-text);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
    font-weight: 600;
}

.clear-stat .value,
.bonus-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
}

.bonus-value {
    color: var(--success-color);
}

/* Game Over Screen */
.game-over-content {
    text-align: center;
    max-width: 450px;
    animation: slideUp 0.4s ease;
}

.game-over-content h2 {
    font-size: 32px;
    margin-bottom: 24px;
    color: var(--danger-color);
}

.final-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 24px;
}

.final-stat {
    padding: 16px;
    background: rgba(230, 126, 34, 0.1);
    border-radius: 10px;
    border: 1px solid rgba(230, 126, 34, 0.2);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.final-stat .label {
    font-size: 11px;
    color: var(--muted-text);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
    font-weight: 600;
}

.final-stat .value {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary-color);
}

.score-value {
    color: var(--accent-color) !important;
}

.record-check {
    padding: 16px;
    background: linear-gradient(135deg, rgba(46, 204, 113, 0.2), rgba(230, 126, 34, 0.2));
    border-radius: 10px;
    border: 2px solid var(--success-color);
    margin-bottom: 24px;
    animation: pulse 1.5s ease-in-out infinite;
}

.record-text {
    font-size: 16px;
    font-weight: 700;
    color: var(--success-color);
    margin: 0;
}

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

/* === Buttons === */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: all 0.3s ease;
    touch-action: manipulation;
    user-select: none;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 12px rgba(230, 126, 34, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(230, 126, 34, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: var(--light-text);
    border: 2px solid rgba(230, 126, 34, 0.3);
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    background: rgba(230, 126, 34, 0.1);
}

.btn-large {
    padding: 16px 32px;
    font-size: 16px;
    min-height: 50px;
}

/* CTA pulse animation for start button */
@keyframes ctaPulse {
    0%, 100% { box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3); }
    50% { box-shadow: 0 4px 30px rgba(52, 152, 219, 0.6), 0 0 60px rgba(52, 152, 219, 0.2); }
}
#start-btn {
    animation: ctaPulse 2s ease-in-out infinite;
}
@media (prefers-reduced-motion: reduce) {
    #start-btn { animation: none !important; }
}

/* === Recommendations Section === */
.rec-section {
    margin: 40px 0;
    padding: 24px;
    background: rgba(230, 126, 34, 0.05);
    border-radius: 12px;
    border: 1px solid rgba(230, 126, 34, 0.1);
    animation: slideUp 0.8s ease 0.4s backwards;
}

.rec-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
    text-align: center;
}

.rec-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: 12px;
}

.rec-card {
    padding: 12px;
    background: rgba(26, 26, 46, 0.8);
    border: 1px solid var(--dark-border);
    border-radius: 10px;
    text-decoration: none;
    color: var(--light-text);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    transition: all 0.3s ease;
    text-align: center;
}

.rec-card:hover {
    background: rgba(230, 126, 34, 0.15);
    border-color: rgba(230, 126, 34, 0.3);
    transform: translateY(-4px);
}

.rec-icon {
    font-size: 28px;
    display: block;
}

.rec-name {
    font-size: 11px;
    font-weight: 600;
    line-height: 1.2;
}

/* === Particle Container === */
.particle-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1000;
}

.particle {
    position: absolute;
    pointer-events: none;
    will-change: transform;
}

/* === Footer === */
.game-footer {
    padding: 24px;
    text-align: center;
    border-top: 1px solid var(--dark-border);
    margin-top: 40px;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-color);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.back-link:hover {
    gap: 12px;
    color: var(--accent-color);
}

/* === Responsive Design === */
@media (max-width: 600px) {
    .container {
        padding: 8px;
    }

    .header {
        padding: 12px;
        margin-bottom: 12px;
    }

    .header-top {
        gap: 8px;
    }

    .logo {
        font-size: 18px;
    }

    .stats-bar {
        gap: 8px;
    }

    .stat-item {
        padding: 8px;
    }

    .stat-label {
        font-size: 10px;
    }

    .stat-value {
        font-size: 20px;
    }

    .game-info-bar {
        gap: 8px;
    }

    .timer-display,
    .attempts-display {
        padding: 6px 10px;
        font-size: 12px;
    }

    .timer-value,
    .attempts-value {
        font-size: 16px;
    }

    .start-title {
        font-size: 22px;
    }

    .start-description {
        font-size: 13px;
        margin-bottom: 16px;
    }

    .theme-selector,
    .difficulty-selector {
        margin-bottom: 16px;
        padding: 16px;
    }

    .theme-buttons,
    .difficulty-buttons {
        grid-template-columns: repeat(2, 1fr);
        gap: 6px;
    }

    .theme-btn,
    .difficulty-btn {
        padding: 10px 6px;
        gap: 4px;
        font-size: 10px;
    }

    .theme-icon,
    .difficulty-icon {
        font-size: 16px;
    }

    .card-grid {
        gap: 8px;
        max-width: 100%;
    }

    .card-face {
        border-radius: 8px;
        font-size: 24px;
    }

    .pause-stats,
    .clear-stats,
    .final-stats {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .clear-stat.highlight {
        grid-column: auto;
    }

    .btn {
        padding: 10px 16px;
        font-size: 12px;
        min-height: 40px;
    }

    .btn-large {
        padding: 12px 24px;
        font-size: 14px;
        min-height: 44px;
    }

    .pause-actions,
    .game-over-actions {
        flex-direction: column;
        gap: 8px;
    }

    .btn {
        width: 100%;
    }

    .rec-section {
        margin: 30px 0;
        padding: 16px;
    }

    .rec-grid {
        grid-template-columns: repeat(auto-fit, minmax(70px, 1fr));
        gap: 10px;
    }

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

    .rec-name {
        font-size: 10px;
    }

    .pause-content h2,
    .clear-title,
    .game-over-content h2 {
        font-size: 24px;
    }
}

@media (max-width: 360px) {
    .stats-bar {
        grid-template-columns: 1fr;
        gap: 6px;
    }

    .stat-item {
        flex-direction: row;
        justify-content: space-between;
        gap: 8px;
    }

    .stat-label {
        margin-bottom: 0;
    }

    .card-grid {
        gap: 6px;
    }

    .card-face {
        border-width: 1px;
        font-size: 20px;
    }
}

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

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

/* === 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;
}

/* Light Mode */
[data-theme="light"] {
    --dark-bg: #f5f5fa;
    --dark-surface: #ffffff;
    --dark-surface-light: #f8f8fc;
    --dark-border: #e0e0e8;
    --light-text: #1a1a2e;
    --muted-text: #5a5a70;
}

[data-theme="light"] body {
    background: linear-gradient(135deg, #f5f5fa 0%, #e8e8f0 100%);
}

[data-theme="light"] .app-loader {
    background: var(--dark-bg);
}

[data-theme="light"] .lang-menu {
    background: var(--dark-surface);
    border-color: var(--dark-border);
}

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

[data-theme="light"] .lang-option:hover {
    background: var(--dark-border);
}

[data-theme="light"] .stats-bar {
    background: rgba(230, 126, 34, 0.05);
    border-color: rgba(230, 126, 34, 0.15);
}

[data-theme="light"] .game-info-bar {
    background: rgba(230, 126, 34, 0.05);
    border-color: rgba(230, 126, 34, 0.15);
}

[data-theme="light"] .start-content,
[data-theme="light"] .pause-content,
[data-theme="light"] .stage-clear-content,
[data-theme="light"] .game-over-content {
    background: var(--dark-surface);
    border-color: var(--dark-border);
}

[data-theme="light"] .btn-secondary {
    background: var(--dark-surface);
    border-color: var(--dark-border);
    color: var(--light-text);
}

[data-theme="light"] .btn-secondary:hover {
    background: var(--dark-border);
}

[data-theme="light"] .card {
    background: var(--dark-surface);
    border-color: var(--dark-border);
}

[data-theme="light"] .card.flipped {
    background: var(--dark-surface-light);
}

[data-theme="light"] .rec-card {
    background: rgba(230, 126, 34, 0.05);
    border-color: rgba(230, 126, 34, 0.15);
}

[data-theme="light"] .rec-card:hover {
    background: rgba(230, 126, 34, 0.1);
}

[data-theme="light"] .game-footer {
    background: var(--dark-bg);
    border-top-color: var(--dark-border);
}

/* Theme Toggle */
.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;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.15);
}

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

[data-theme="light"] .theme-toggle {
    background: rgba(230, 126, 34, 0.1);
    border-color: rgba(230, 126, 34, 0.2);
    color: var(--light-text);
}

[data-theme="light"] .theme-toggle:hover {
    background: rgba(230, 126, 34, 0.15);
}

/* Selection Color */
::selection {
    background: #e67e22;
    color: white;
}

::-moz-selection {
    background: #e67e22;
    color: white;
}