/* ═══════════════════════════════════════════════════
   COIN FLIP SIMULATOR V3 - MAIN STYLES (INTERFACE)
   Dark Theme - Mobile First
   ═══════════════════════════════════════════════════ */

/* === RESET & BASE === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors - Dark Theme */
    --bg-primary: #0f0f1e;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #252538;
    --bg-card: #1e1e30;
    
    --text-primary: #ffffff;
    --text-secondary: #b8b8d1;
    --text-muted: #6e6e8f;
    
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-success: #10b981;
    --accent-warning: #f59e0b;
    --accent-danger: #ef4444;
    
    --gold: #ffd700;
    --silver: #c0c0c0;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.6);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

/* === HEADER === */
.main-header {
    background: var(--bg-secondary);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    min-height: 70px;
}

.nav-brand .logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    text-decoration: none;
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 700;
    transition: var(--transition-base);
}

.logo-icon {
    font-size: 2rem;
    animation: rotate-slow 20s linear infinite;
}

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

.logo-text {
    display: none;
}

.mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: var(--radius-full);
    transition: var(--transition-base);
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

.nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background: var(--bg-secondary);
    list-style: none;
    padding: var(--spacing-md);
    transition: var(--transition-base);
    box-shadow: var(--shadow-lg);
}

.nav-menu.active {
    left: 0;
}

.nav-item {
    margin-bottom: var(--spacing-sm);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: var(--transition-base);
    font-weight: 500;
}

.nav-link:hover,
.nav-link.active {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.nav-icon {
    font-size: 1.5rem;
}

/* === MAIN CONTENT === */
.main-content {
    min-height: calc(100vh - 70px - 200px);
}

/* === HERO SECTION === */
.hero-section {
    padding: var(--spacing-lg) 0;
    min-height: calc(100vh - 70px);
    display: flex;
    align-items: center;
    justify-content: center;
}

.flip-simulator {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl) var(--spacing-md);
    box-shadow: var(--shadow-xl);
    text-align: center;
    position: relative;
    max-width: 600px;
    margin: 0 auto;
}

.settings-btn {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: var(--bg-tertiary);
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-base);
}

.settings-btn:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
    transform: rotate(90deg);
}

.simulator-title {
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.simulator-subtitle {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    font-size: 1.1rem;
}

/* === COIN === */
.coin-container {
    margin: var(--spacing-xl) 0;
    perspective: 1000px;
    min-height: 280px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.coin {
    width: 220px;
    height: 220px;
    position: relative;
    transform-style: preserve-3d;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.coin:hover {
    transform: scale(1.05);
}

.coin:active {
    transform: scale(0.98);
}

.coin-side {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    backface-visibility: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 2px;
    box-shadow: var(--shadow-lg);
    border: 6px solid rgba(255, 255, 255, 0.2);
}

.coin-heads {
    background: radial-gradient(circle at 35% 35%, #fff9c4 0%, #ffd700 30%, #daa520 70%, #b8860b 100%);
    color: #8b6914;
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.5);
    transform: rotateX(0deg);
}

.coin-tails {
    background: radial-gradient(circle at 35% 35%, #ffffff 0%, #e8e8e8 30%, #c0c0c0 70%, #a0a0a0 100%);
    color: #505050;
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.8);
    transform: rotateX(180deg);
}

.coin-text {
    position: relative;
    z-index: 2;
}

/* === FLIP CONTROLS === */
.flip-controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.flip-btn {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: var(--text-primary);
    border: none;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-full);
    font-size: 1.25rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
    transition: var(--transition-base);
    min-width: 200px;
    justify-content: center;
}

.flip-btn:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 12px 30px rgba(99, 102, 241, 0.6);
}

.flip-btn:active:not(:disabled) {
    transform: translateY(-1px);
}

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

.btn-icon {
    font-size: 1.5rem;
}

/* === SOUND TOGGLE === */
.sound-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.sound-toggle input {
    display: none;
}

.toggle-slider {
    width: 50px;
    height: 26px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    position: relative;
    transition: var(--transition-base);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--text-secondary);
    top: 3px;
    left: 3px;
    transition: var(--transition-base);
}

.sound-toggle input:checked + .toggle-slider {
    background: var(--accent-success);
}

.sound-toggle input:checked + .toggle-slider::before {
    transform: translateX(24px);
    background: white;
}

.toggle-label {
    font-weight: 600;
    color: var(--text-secondary);
}

/* === HOW TO SECTION === */
.how-to-section {
    padding: var(--spacing-xxl) 0;
    background: var(--bg-secondary);
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.how-to-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.how-to-card {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition-base);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.how-to-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-primary);
}

.card-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.3));
}

.how-to-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.how-to-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* === CONTENT SECTION === */
.content-section {
    background: var(--bg-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.content-section h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.content-section h3 {
    font-size: 1.5rem;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    color: var(--accent-primary);
}

.content-section h4 {
    font-size: 1.25rem;
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.content-section p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.content-section ul {
    list-style: none;
    padding-left: 0;
    margin-bottom: var(--spacing-md);
}

.content-section ul li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--text-secondary);
    line-height: 1.8;
}

.content-section ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-success);
    font-weight: bold;
}

.content-section strong {
    color: var(--accent-primary);
    font-weight: 600;
}

/* === MODALS === */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-modal);
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.modal.show {
    display: flex;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    animation: fadeIn 0.3s ease;
}

.modal-content {
    position: relative;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.1);
    animation: slideUp 0.4s ease;
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    background: var(--bg-tertiary);
    border: 2px solid rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-base);
    z-index: 10;
}

.modal-close:hover {
    background: var(--accent-danger);
    color: white;
    border-color: var(--accent-danger);
    transform: rotate(90deg);
}

.modal-title {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-md);
    text-align: center;
    color: var(--text-primary);
}

/* === RESULT MODAL === */
.result-modal-content {
    text-align: center;
}

.result-icon {
    font-size: 6rem;
    margin-bottom: var(--spacing-md);
    animation: bounceIn 0.6s ease;
}

.result-title {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    font-weight: 900;
}

.result-title.heads {
    background: linear-gradient(135deg, #ffd700, #ffed4e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.result-title.tails {
    background: linear-gradient(135deg, #e8e8e8, #c0c0c0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.result-message {
    color: var(--text-secondary);
    font-size: 1.2rem;
    margin-bottom: var(--spacing-xl);
}

.result-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    justify-content: center;
}

.result-btn {
    flex: 1;
    min-width: 140px;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-full);
    text-decoration: none;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    transition: var(--transition-base);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 2px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
    background: var(--bg-secondary);
    border-color: var(--accent-primary);
}

/* === SETTINGS MODAL === */
.settings-modal-content {
    max-width: 600px;
}

.settings-section {
    margin-bottom: var(--spacing-xl);
}

.settings-section h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.radio-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.radio-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-base);
    border: 2px solid transparent;
}

.radio-label:hover {
    background: var(--bg-secondary);
    border-color: var(--accent-primary);
}

.radio-label input {
    display: none;
}

.radio-custom {
    width: 24px;
    height: 24px;
    border: 2px solid var(--text-secondary);
    border-radius: 50%;
    position: relative;
    transition: var(--transition-base);
}

.radio-label input:checked + .radio-custom {
    border-color: var(--accent-primary);
}

.radio-label input:checked + .radio-custom::after {
    content: '';
    position: absolute;
    width: 12px;
    height: 12px;
    background: var(--accent-primary);
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.radio-text {
    color: var(--text-primary);
    font-weight: 600;
}

/* === COLOR PRESETS === */
.color-presets {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
}

.color-preset {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-base);
    color: var(--text-primary);
    font-weight: 600;
}

.color-preset:hover {
    background: var(--bg-secondary);
    border-color: var(--accent-primary);
}

.color-preset.active {
    border-color: var(--accent-primary);
    background: var(--bg-secondary);
}

.preset-circle {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 3px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-sm);
}

/* === COIN SETS === */
.coin-sets {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

.coin-set {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-base);
}

.coin-set:hover {
    border-color: var(--accent-primary);
}

.coin-set input {
    display: none;
}

.coin-set input:checked + .coin-set-preview {
    border-color: var(--accent-primary);
}

.coin-set-preview {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    transition: var(--transition-base);
}

.coin-set-preview img {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: 50%;
    box-shadow: var(--shadow-md);
}

.coin-set span {
    color: var(--text-primary);
    font-weight: 600;
}

.apply-btn {
    width: 100%;
    padding: var(--spacing-md);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    border: none;
    border-radius: var(--radius-full);
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition-base);
    margin-top: var(--spacing-md);
}

.apply-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.5);
}

/* === FOOTER === */
.main-footer {
    background: var(--bg-secondary);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-xl) 0 var(--spacing-md);
    margin-top: var(--spacing-xxl);
}

.footer-content {
    margin-bottom: var(--spacing-lg);
}

.footer-nav {
    margin-bottom: var(--spacing-lg);
}

.footer-menu {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) 0;
}

.footer-menu li a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: var(--transition-base);
    font-weight: 500;
}

.footer-menu li a:hover {
    color: var(--accent-primary);
    background: var(--bg-tertiary);
}

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

.social-link {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-base);
}

.social-link:hover {
    background: var(--accent-primary);
    color: white;
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.copyright {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
}

.footer-note {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* === UTILITY CLASSES === */
.hidden {
    display: none !important;
}

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

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }

/* === ANIMATIONS === */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3);
    }
    50% {
        opacity: 1;
        transform: scale(1.1);
    }
    70% {
        transform: scale(0.9);
    }
    100% {
        transform: scale(1);
    }
}

/* === RESPONSIVE === */

/* Tablet (768px and up) */
@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
    
    .logo-text {
        display: block;
    }
    
    .mobile-menu-toggle {
        display: none;
    }
    
    .nav-menu {
        position: static;
        width: auto;
        height: auto;
        background: transparent;
        padding: 0;
        display: flex;
        flex-direction: row;
        box-shadow: none;
    }
    
    .nav-item {
        margin-bottom: 0;
    }
    
    .nav-link {
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .nav-icon {
        font-size: 1.2rem;
    }
    
    .simulator-title {
        font-size: 2.5rem;
    }
    
    .coin {
        width: 280px;
        height: 280px;
    }
    
    .how-to-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .color-presets {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .coin-sets {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .result-actions {
        flex-wrap: nowrap;
    }
}
/* ========================================
   MOBILE TOUCH IMPROVEMENTS
   ======================================== */

/* Improve touch targets */
.flip-btn,
.coin,
.settings-btn,
.modal-close,
.nav-link {
    -webkit-tap-highlight-color: rgba(99, 102, 241, 0.3);
    touch-action: manipulation;
}

/* Ensure buttons are easily tappable (minimum 44x44px) */
.settings-btn {
    min-width: 48px;
    min-height: 48px;
}

.flip-btn {
    min-height: 54px;
}

/* Prevent text selection on coin */
.coin,
.coin * {
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

/* Improve modal visibility on small screens */
@media (max-width: 480px) {
    .modal-content {
        max-height: 85vh;
        padding: var(--spacing-lg);
    }
    
    .settings-modal-content {
        padding: var(--spacing-md);
    }
    
    .modal-close {
        width: 48px;
        height: 48px;
        top: 10px;
        right: 10px;
    }
}

/* Fix mobile menu z-index */
.nav-menu.active {
    z-index: 999;
}

/* Ensure modals are above everything */
.modal {
    z-index: 10000;
}

.modal.show {
    z-index: 10000;
}

/* Better visual feedback for touch */
.coin:active {
    transform: scale(0.95) !important;
}

.flip-btn:active:not(:disabled) {
    transform: translateY(0) scale(0.98) !important;
}

.settings-btn:active {
    transform: scale(0.9);
}

/* Prevent double-tap zoom on buttons */
button,
.coin,
.nav-link {
    touch-action: manipulation;
}
/* Desktop (1024px and up) */
@media (min-width: 1024px) {
    html {
        font-size: 18px;
    }
    
    .simulator-title {
        font-size: 3rem;
    }
    
    .coin {
        width: 320px;
        height: 320px;
    }
    
    .coin-side {
        font-size: 2.2rem;
    }
    
    .how-to-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .section-title {
        font-size: 3rem;
    }
}

/* Large Desktop (1440px and up) */
@media (min-width: 1440px) {
    .container {
        max-width: 1400px;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
}

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