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

:root {
    --primary: #FF006E;
    --secondary: #FB5607;
    --accent: #FFBE0B;
    --purple: #8338EC;
    --blue: #3A86FF;
    --dark: #1a1a2e;
    --darker: #16213e;
    --light: #ffffff;
    --gray: #6c757d;
    --success: #28a745;
    --danger: #dc3545;
    --warning: #ffc107;
    --gradient: linear-gradient(135deg, var(--primary), var(--purple), var(--blue));
    --holographic: linear-gradient(45deg, 
        var(--primary) 0%, 
        var(--secondary) 20%, 
        var(--accent) 40%, 
        var(--purple) 60%, 
        var(--blue) 80%, 
        var(--primary) 100%);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--dark);
    color: var(--light);
    min-height: 100vh;
    overflow-x: hidden;
    padding-bottom: 80px;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--holographic);
    opacity: 0.1;
    z-index: -1;
    animation: holographic-bg 10s ease-in-out infinite alternate;
}

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

/* Header */
.app-header {
    background: rgba(26, 26, 46, 0.95);
    backdrop-filter: blur(10px);
    padding: 1rem;
    text-align: center;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 2px solid var(--primary);
}

.app-header h1 {
    font-size: 1.5rem;
    background: var(--holographic);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.language-selector {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
}

.lang-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--primary);
    color: var(--light);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.8rem;
}

.lang-btn.active {
    background: var(--primary);
    box-shadow: 0 0 20px rgba(255, 0, 110, 0.5);
}

/* Main Content */
.app-main {
    padding: 1rem;
    max-width: 100%;
}

.app-section {
    display: none;
    animation: fadeIn 0.5s ease-in-out;
}

.app-section.active {
    display: block;
}

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

/* Game Container */
.game-container {
    text-align: center;
    padding: 2rem 1rem;
}

.game-status h2 {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    color: var(--accent);
}

.reaction-display {
    display: flex;
    justify-content: center;
    margin: 2rem 0;
}

.reaction-circle {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 3px solid transparent;
    background: linear-gradient(var(--dark), var(--dark)) padding-box,
                var(--holographic) border-box;
    position: relative;
    overflow: hidden;
}

.reaction-circle::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: var(--holographic);
    opacity: 0;
    transition: opacity 0.3s ease;
    animation: rotate 2s linear infinite;
}

.reaction-circle:hover::before {
    opacity: 0.1;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.reaction-circle.waiting {
    background: radial-gradient(circle, var(--danger), var(--dark));
}

.reaction-circle.ready {
    background: radial-gradient(circle, var(--success), var(--dark));
    box-shadow: 0 0 50px rgba(40, 167, 69, 0.7);
}

.reaction-circle.clicked {
    background: radial-gradient(circle, var(--blue), var(--dark));
    transform: scale(0.95);
}

#reaction-text {
    font-size: 1.1rem;
    font-weight: bold;
    z-index: 2;
    position: relative;
    text-align: center;
    padding: 1rem;
}

/* Game Controls */
.game-controls {
    margin-top: 2rem;
}

.mode-selector {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.mode-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid var(--purple);
    color: var(--light);
    padding: 1rem 1.5rem;
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    min-width: 120px;
}

.mode-btn.active {
    background: var(--purple);
    box-shadow: 0 0 30px rgba(131, 56, 236, 0.5);
    transform: translateY(-2px);
}

.mode-btn i {
    font-size: 1.5rem;
}

.start-btn {
    background: var(--gradient);
    border: none;
    color: var(--light);
    padding: 1rem 2rem;
    border-radius: 50px;
    cursor: pointer;
    font-size: 1.2rem;
    font-weight: bold;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 auto;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

.start-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.current-attempt {
    margin-top: 2rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    border: 1px solid var(--primary);
}

.attempt-result {
    font-size: 1.2rem;
}

#last-time {
    color: var(--accent);
    font-size: 1.5rem;
}

/* Statistics */
.stats-container {
    padding: 1rem;
}

.stats-container h2 {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 1.8rem;
    background: var(--holographic);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid transparent;
    background-clip: padding-box;
    border-radius: 15px;
    padding: 1.5rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    inset: 0;
    padding: 2px;
    background: var(--holographic);
    border-radius: 15px;
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask-composite: exclude;
    -webkit-mask-composite: xor;
}

.stat-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.stat-label {
    display: block;
    font-size: 0.9rem;
    color: var(--gray);
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent);
}

/* History */
.history-section {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    padding: 1.5rem;
    border: 1px solid var(--blue);
}

.history-section h3 {
    margin-bottom: 1rem;
    color: var(--blue);
}

.history-list {
    max-height: 200px;
    overflow-y: auto;
    margin-bottom: 1rem;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem;
    margin-bottom: 0.5rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    border-left: 3px solid var(--primary);
}

.history-time {
    font-weight: bold;
    color: var(--accent);
}

.history-mode {
    font-size: 0.8rem;
    color: var(--gray);
}

.clear-btn {
    background: var(--danger);
    border: none;
    color: var(--light);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 auto;
}

.clear-btn:hover {
    background: #c82333;
    transform: translateY(-1px);
}

/* Ranking */
.ranking-container {
    padding: 1rem;
}

.ranking-container h2 {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 1.8rem;
    background: var(--holographic);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.player-form {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    border: 1px solid var(--secondary);
}

.player-form h3 {
    margin-bottom: 1rem;
    color: var(--secondary);
}

.form-group {
    display: flex;
    gap: 1rem;
    align-items: center;
}

#player-name {
    flex: 1;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid var(--primary);
    color: var(--light);
    padding: 0.8rem;
    border-radius: 10px;
    font-size: 1rem;
}

#player-name:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 10px rgba(255, 190, 11, 0.3);
}

.save-btn {
    background: var(--success);
    border: none;
    color: var(--light);
    padding: 0.8rem 1.2rem;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.save-btn:hover {
    background: #218838;
    transform: translateY(-1px);
}

.ranking-list {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    overflow: hidden;
    border: 1px solid var(--purple);
}

.ranking-header {
    display: grid;
    grid-template-columns: 1fr 2fr 1.5fr;
    gap: 1rem;
    padding: 1rem;
    background: var(--purple);
    font-weight: bold;
    text-align: center;
}

.ranking-item {
    display: grid;
    grid-template-columns: 1fr 2fr 1.5fr;
    gap: 1rem;
    padding: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    align-items: center;
    text-align: center;
}

.ranking-item:nth-child(2) {
    background: linear-gradient(90deg, rgba(255, 215, 0, 0.2), transparent);
}

.ranking-item:nth-child(3) {
    background: linear-gradient(90deg, rgba(192, 192, 192, 0.2), transparent);
}

.ranking-item:nth-child(4) {
    background: linear-gradient(90deg, rgba(205, 127, 50, 0.2), transparent);
}

.ranking-position {
    font-weight: bold;
    color: var(--accent);
}

.ranking-player {
    color: var(--light);
}

.ranking-time {
    font-weight: bold;
    color: var(--success);
}

/* Settings */
.settings-container {
    padding: 1rem;
}

.settings-container h2 {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 1.8rem;
    background: var(--holographic);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.settings-group {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    border: 1px solid var(--blue);
}

.settings-group h3 {
    margin-bottom: 1.5rem;
    color: var(--blue);
}

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

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

.setting-item label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
}

.toggle-switch {
    position: relative;
    width: 50px;
    height: 25px;
}

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

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--gray);
    transition: 0.4s;
    border-radius: 25px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 19px;
    width: 19px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: 0.4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--primary);
}

input:checked + .slider:before {
    transform: translateX(25px);
}

#difficulty-level {
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid var(--primary);
    color: var(--light);
    padding: 0.5rem;
    border-radius: 8px;
    font-size: 1rem;
    min-width: 120px;
}

.action-btn, .danger-btn {
    background: var(--blue);
    border: none;
    color: var(--light);
    padding: 1rem 1.5rem;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0.5rem;
    font-size: 1rem;
}

.danger-btn {
    background: var(--danger);
}

.action-btn:hover {
    background: #2980b9;
    transform: translateY(-1px);
}

.danger-btn:hover {
    background: #c82333;
    transform: translateY(-1px);
}

/* FAQ */
.faq-container {
    padding: 1rem;
}

.faq-container h2 {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 1.8rem;
    background: var(--holographic);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.faq-item {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    margin-bottom: 1rem;
    overflow: hidden;
    border: 1px solid var(--secondary);
}

.faq-question {
    width: 100%;
    background: none;
    border: none;
    color: var(--light);
    padding: 1.5rem;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.faq-question:hover {
    background: rgba(255, 255, 255, 0.1);
}

.faq-question[aria-expanded="true"] {
    background: rgba(251, 86, 7, 0.2);
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-icon {
    font-size: 1.5rem;
    color: var(--secondary);
    transition: transform 0.3s ease;
}

.faq-answer {
    padding: 0 1.5rem 1.5rem;
    color: var(--gray);
    line-height: 1.6;
    animation: slideDown 0.3s ease-out;
}

.faq-answer[hidden] {
    display: none;
}

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

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(26, 26, 46, 0.95);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: space-around;
    padding: 0.5rem 0;
    border-top: 2px solid var(--primary);
    z-index: 1000;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--gray);
    transition: all 0.3s ease;
    padding: 0.5rem;
    border-radius: 10px;
    min-width: 60px;
}

.nav-item.active {
    color: var(--primary);
    background: rgba(255, 0, 110, 0.1);
}

.nav-item i {
    font-size: 1.2rem;
    margin-bottom: 0.2rem;
}

.nav-item span {
    font-size: 0.7rem;
    font-weight: 500;
}

.nav-item:hover {
    color: var(--primary);
    transform: translateY(-2px);
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--gray);
    font-size: 0.8rem;
    background: rgba(255, 255, 255, 0.05);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: 2rem;
}

/* Utility Classes */
.no-data {
    text-align: center;
    color: var(--gray);
    padding: 2rem;
    font-style: italic;
}

.hidden {
    display: none !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    .game-container {
        padding: 1rem 0.5rem;
    }
    
    .reaction-circle {
        width: 200px;
        height: 200px;
    }
    
    .mode-selector {
        flex-direction: column;
        align-items: center;
    }
    
    .mode-btn {
        width: 100%;
        max-width: 200px;
    }
    
    .form-group {
        flex-direction: column;
        align-items: stretch;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .ranking-header,
    .ranking-item {
        grid-template-columns: 0.5fr 1.5fr 1fr;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .app-header h1 {
        font-size: 1.2rem;
    }
    
    .reaction-circle {
        width: 180px;
        height: 180px;
    }
    
    #reaction-text {
        font-size: 1rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-item span {
        font-size: 0.6rem;
    }
    
    .nav-item i {
        font-size: 1rem;
    }
}

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

.pulse {
    animation: pulse 0.6s ease-in-out;
}

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

.shake {
    animation: shake 0.5s ease-in-out;
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 30px;
    height: 30px;
    border: 3px solid var(--primary);
    border-top: 3px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary);
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --primary: #ff0080;
        --secondary: #ff6600;
        --accent: #ffcc00;
        --purple: #9900ff;
        --blue: #0066ff;
    }
}

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