.crypto-empire .sidebar {
    position: relative;
    left: 0;
    width: 280px;
    overflow: visible; /* avoid internal scrollbar; let page scroll */
}

.crypto-empire .main-content {
    margin-left: 0;
}

.crypto-empire .sidebar.collapsed { width: 72px; }

/* Offset the logo header so it doesn't sit under the fixed sidebar */
.crypto-empire.games-page header { padding-left: 0; }

@media (max-width: 768px) {
    .crypto-empire .sidebar { width: 100%; }
    .crypto-empire .main-content { margin-left: 0; }
    .crypto-empire.games-page header { padding-left: 0; }
}

/* Custom Scrollbar Styling */
.crypto-app,
.crypto-app .sidebar,
.crypto-app .main-content,
.crypto-app .crypto-container,
.crypto-empire .modal {
    scrollbar-width: thin;
    scrollbar-color: rgba(52, 84, 209, 0.6) rgba(15, 23, 42, 0.3);
}

/* Webkit browsers (Chrome, Safari, Edge) */
.crypto-app::-webkit-scrollbar,
.crypto-app .sidebar::-webkit-scrollbar,
.crypto-app .main-content::-webkit-scrollbar,
.crypto-app .crypto-container::-webkit-scrollbar,
.crypto-empire .modal::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

.crypto-app::-webkit-scrollbar-track,
.crypto-app .sidebar::-webkit-scrollbar-track,
.crypto-app .main-content::-webkit-scrollbar-track,
.crypto-app .crypto-container::-webkit-scrollbar-track,
.crypto-empire .modal::-webkit-scrollbar-track {
    background: rgba(15, 23, 42, 0.4);
    border-radius: 10px;
}

.crypto-app::-webkit-scrollbar-thumb,
.crypto-app .sidebar::-webkit-scrollbar-thumb,
.crypto-app .main-content::-webkit-scrollbar-thumb,
.crypto-app .crypto-container::-webkit-scrollbar-thumb,
.crypto-empire .modal::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #3454d1 0%, #5b75e8 100%);
    border-radius: 10px;
    border: 2px solid rgba(15, 23, 42, 0.4);
    transition: all 0.3s ease;
}

.crypto-app::-webkit-scrollbar-thumb:hover,
.crypto-app .sidebar::-webkit-scrollbar-thumb:hover,
.crypto-app .main-content::-webkit-scrollbar-thumb:hover,
.crypto-app .crypto-container::-webkit-scrollbar-thumb:hover,
.crypto-empire .modal::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, #4767e8 0%, #7b95ff 100%);
    box-shadow: 0 0 10px rgba(52, 84, 209, 0.5);
}
/* Crypto Empire site skin (scoped to crypto-empire pages) */
:root {
    --primary: #3454d1;
    --primary-dark: #233ba3;
    --primary-rgb: 52, 84, 209;
    --success: #2ccf7c;
    --warning: #ffb547;
    --danger: #ff4d4f;
    --bg-primary: #0f172a;
    --bg-secondary: #16213b;
    --bg-tertiary: #1d2b47;
    --text-primary: #e6ebe0;
    --text-secondary: #b8c2cc;
    --border-color: #304369;
    --card-bg: #131c33;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    --spacing-2xl: 24px;
    --spacing-3xl: 28px;
    --spacing-4xl: 32px;
    --spacing-5xl: 40px;
}

html.crypto-empire,
body.crypto-empire {
    height: 100%;
    overflow: hidden;
    margin: 0;
    padding: 0;
}

body.crypto-empire {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-text, "Montserrat", "Inter", "Segoe UI", sans-serif);
}

body.crypto-empire.theme-light {
    --primary: #3454d1;
    --primary-dark: #233ba3;
    --primary-rgb: 52, 84, 209;
    --success: #0fb46c;
    --warning: #ffb547;
    --danger: #ff4d4f;
    --bg-primary: #f6f8fb;
    --bg-secondary: #ffffff;
    --bg-tertiary: #eef2f8;
    --text-primary: #0f172a;
    --text-secondary: #4b5563;
    --border-color: #dde3ee;
    --card-bg: #ffffff;
}

html.crypto-empire {
    margin: 0;
    padding: 0;
}

body.crypto-empire {
    min-height: 100vh;
    overflow: hidden;
    margin: 0;
    padding: 0;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-text, "Montserrat", "Inter", "Segoe UI", sans-serif);
}

body.crypto-empire * { box-sizing: border-box; }
body.crypto-empire img { max-width: 100%; height: auto; }

/* Make the game use full available width on games page */
.crypto-empire.games-page .container {
    max-width: none;
    width: 100%;
    height: 100vh;
    padding: 0;
    margin: 0;
    text-align: initial;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.crypto-empire .panel.crypto-shell {
    background: transparent;
    border: none;
    border-radius: 0;
    box-shadow: none;
    padding: 0;
    margin: 0;
    flex: 1;
    overflow: hidden;
    display: flex;
}

.crypto-app {
    display: flex;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    overflow: hidden;
}

.crypto-app .sidebar {
    width: 280px;
    background: var(--bg-secondary);
    padding: var(--spacing-2xl) var(--spacing-lg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    overflow-y: auto;
    overflow-x: hidden;
    scrollbar-width: none; /* hide sidebar scrollbar while keeping scroll behavior */
    flex-shrink: 0;
    transition: width 0.3s ease;
}

.crypto-app .sidebar::-webkit-scrollbar { display: none; }

.crypto-empire.games-page header {
    padding: 1.5rem;
    margin: 0;
    flex-shrink: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    z-index: 10;
    display: block;
    text-align: left;
}

.crypto-empire.games-page .logo-link {
    display: block;
    line-height: 0;
    margin: 0;
    padding: 0;
}

.crypto-empire.games-page .logo-link:hover {
    transform: none !important;
}

.crypto-empire.games-page .logo-img {
    width: 250px;
    max-width: 250px;
    height: auto;
    display: block;
    margin: 0;
    padding: 0;
    vertical-align: top;
    filter: drop-shadow(0 5px 15px rgba(0,0,0,0.5));
}

/* Collapsed sidebar styles to support toggle */
.crypto-app .sidebar.collapsed {
    width: 80px;
    padding: var(--spacing-2xl) var(--spacing-sm);
}
.crypto-app .sidebar.collapsed .version-row h1,
.crypto-app .sidebar.collapsed .nav-label,
.crypto-app .sidebar.collapsed .quick-actions,
.crypto-app .sidebar.collapsed .quick-title,
.crypto-app .sidebar.collapsed .btn-text { display: none; }
.crypto-app .sidebar.collapsed .logo-section { justify-content: center; gap: 0; margin-bottom: var(--spacing-lg); }
.crypto-app .sidebar.collapsed .sidebar-top { justify-content: center; align-items: center; }
.crypto-app .sidebar.collapsed .nav-menu { gap: var(--spacing-sm); }
.crypto-app .sidebar.collapsed .nav-button { justify-content: center; padding: var(--spacing-md); }
.crypto-app .sidebar.collapsed .nav-icon { margin: 0; font-size: 1.5em; }
.crypto-app .sidebar.collapsed .balance-widget { 
    margin: var(--spacing-md) 0; 
    padding: var(--spacing-xs) var(--spacing-sm);
    overflow: hidden;
}
.crypto-app .sidebar.collapsed .balance-label { 
    font-size: 0.65em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.crypto-app .sidebar.collapsed .balance-amount { 
    font-size: 0.95em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.crypto-app .sidebar-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-sm);
}

.crypto-app .logo-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.crypto-app .logo {
    font-size: 2rem;
    line-height: 1;
}

.crypto-app .logo-section h1 {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.3px;
    color: var(--text-primary);
}

.crypto-app .theme-toggle {
    position: relative;
    width: 72px;
    height: 32px;
    border-radius: 16px;
    border: 1px solid rgba(var(--primary-rgb), 0.35);
    background: linear-gradient(135deg, var(--bg-tertiary), rgba(var(--primary-rgb), 0.08));
    display: inline-flex;
    align-items: center;
    padding: 4px 6px;
    cursor: pointer;
    gap: 8px;
}

.crypto-app .theme-toggle .toggle-knob {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    box-shadow: 0 6px 16px rgba(var(--primary-rgb), 0.28);
    transition: transform 0.25s ease;
}

.crypto-app .theme-toggle[data-theme="light"] .toggle-knob { transform: translateX(34px); }
.crypto-app .theme-toggle .theme-icon { font-size: 14px; color: var(--text-secondary); }
.crypto-app .theme-toggle[data-theme="light"] .theme-icon.sun { color: #ffb547; }

.crypto-app .sidebar-toggle {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid rgba(var(--primary-rgb), 0.3);
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
    color: var(--primary);
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.crypto-app .sidebar-toggle:hover {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border-color: var(--primary);
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.3);
}

.crypto-app .sidebar-toggle:active {
    transform: scale(0.95);
}

.crypto-app .balance-widget {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    padding: var(--spacing-lg) var(--spacing-xl);
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 10px 24px rgba(var(--primary-rgb), 0.25);
}

.crypto-app .balance-label {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.85);
    letter-spacing: 0.4px;
}

.crypto-app .balance-amount {
    font-size: 1.8rem;
    font-weight: 700;
    color: #fff;
}

.crypto-app .nav-menu {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.crypto-app .nav-button {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 14px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-secondary);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.crypto-app .nav-button:hover { border-color: rgba(var(--primary-rgb), 0.5); color: var(--primary); }
.crypto-app .nav-button.active {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    border-color: transparent;
    box-shadow: 0 10px 24px rgba(var(--primary-rgb), 0.25);
}

.crypto-app .nav-icon { font-size: 1.1rem; }
.crypto-app .nav-label { flex: 1; }

.crypto-app .quick-actions {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.crypto-app .action-btn {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 10px;
    border: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
}

.crypto-app .action-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.2);
}

.crypto-app .action-btn.danger { border-color: rgba(255,77,79,0.35); color: #ff4d4f; }

.crypto-app .legal-faq-btn {
    background: linear-gradient(135deg, rgba(255, 184, 71, 0.2) 0%, rgba(255, 184, 71, 0.1) 100%) !important;
    border: 2px solid rgba(255, 184, 71, 0.5) !important;
    color: #ffb847 !important;
    font-weight: 800;
    font-size: 1.05em;
}

.crypto-app .legal-faq-btn:hover:not(:disabled) {
    background: linear-gradient(135deg, rgba(255, 184, 71, 0.3) 0%, rgba(255, 184, 71, 0.2) 100%) !important;
    border-color: #ffb847 !important;
    box-shadow: 0 0 12px rgba(255, 184, 71, 0.3);
    transform: translateY(-2px);
}

.crypto-app .stats-widget {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: var(--spacing-lg);
}

.crypto-app .stat-line { display: flex; justify-content: space-between; color: var(--text-secondary); }

.crypto-app .main-content {
    flex: 1;
    background: var(--bg-primary);
    overflow-y: auto;
    overflow-x: hidden;
}

.crypto-app .crypto-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-5xl);
}

.crypto-app .tab-content { display: none; }
.crypto-app .tab-content.active { display: block; }

.crypto-app .dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-4xl);
}

.crypto-app .stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: var(--spacing-3xl);
    box-shadow: 0 10px 24px rgba(0,0,0,0.25);
}

.crypto-app .stat-card h3 {
    font-size: 0.95rem;
    color: var(--text-secondary);
    letter-spacing: 0.4px;
    margin-bottom: var(--spacing-md);
}

.crypto-app .stat-value {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--primary);
}

.crypto-app .section {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: var(--spacing-4xl);
    margin-bottom: var(--spacing-4xl);
    box-shadow: 0 10px 30px rgba(0,0,0,0.25);
}

.crypto-app .section h2 {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-2xl);
    color: var(--text-primary);
}

.crypto-app .section p { color: var(--text-secondary); line-height: 1.7; }

.crypto-app .shop-grid,
.crypto-app .mining-grid,
.crypto-app .crypto-grid,
.crypto-app .holdings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: var(--spacing-2xl);
}

.crypto-app .shop-item,
.crypto-app .miner-card,
.crypto-app .crypto-card,
.crypto-app .holding-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: var(--spacing-2xl);
    box-shadow: 0 10px 22px rgba(0,0,0,0.28);
}

.crypto-app .hashrate-badge,
.crypto-app .efficiency-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 10px;
    font-weight: 700;
    font-size: 0.85rem;
}

.crypto-app .hashrate-badge { background: rgba(var(--primary-rgb),0.15); color: var(--primary); border: 1px solid rgba(var(--primary-rgb),0.35); }
.crypto-app .efficiency-badge { background: rgba(44,207,124,0.15); color: var(--success); border: 1px solid rgba(44,207,124,0.35); }

.crypto-app .description { color: var(--text-secondary); }
.crypto-app .owned-count { color: var(--warning); font-weight: 700; }
.crypto-app .price { color: var(--success); font-weight: 800; font-size: 1.2rem; }

.crypto-app button {
    border: none;
    border-radius: 10px;
    padding: var(--spacing-md) var(--spacing-lg);
    font-weight: 700;
    cursor: pointer;
    background: var(--primary);
    color: #fff;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

/* Trading buttons: green for buy, red for sell */
.crypto-app .buy-btn { background: var(--success); }
.crypto-app .sell-btn { background: var(--danger); }
.crypto-app .sell-all-btn { background: var(--danger); }
.crypto-app .buy-btn:hover:not(:disabled),
.crypto-app .sell-btn:hover:not(:disabled),
.crypto-app .sell-all-btn:hover:not(:disabled) { transform: translateY(-1px); }
.crypto-app .sell-btn:disabled,
.crypto-app .sell-all-btn:disabled { opacity: 0.6; cursor: not-allowed; }

.crypto-app button:disabled { opacity: 0.6; cursor: not-allowed; }
.crypto-app button:hover:not(:disabled) { transform: translateY(-1px); }

.crypto-app select,
.crypto-app input[type="number"] {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.crypto-app .trading-controls { display: flex; gap: var(--spacing-sm); flex-wrap: wrap; margin-top: var(--spacing-md); }
.crypto-app .trading-controls button { flex: 1 1 48%; min-width: 120px; }

.crypto-app .crypto-card h3 { font-size: 1.4rem; color: var(--primary); margin: 0; }
.crypto-app .crypto-name { color: var(--text-secondary); }
.crypto-app .crypto-price { font-size: 1.6rem; font-weight: 800; color: var(--success); }
.crypto-app .crypto-value { color: var(--warning); font-weight: 700; }

.crypto-app .holding-card {
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, rgba(0,0,0,0.2) 100%);
    border: 1.5px solid rgba(var(--primary-rgb), 0.2);
    padding: var(--spacing-lg) var(--spacing-2xl);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 12px;
}

.crypto-app .holding-card:hover {
    border-color: rgba(var(--primary-rgb), 0.4);
    box-shadow: 0 0 20px rgba(var(--primary-rgb), 0.15);
    transform: translateY(-2px);
}

.crypto-app .holding-icon-top {
    display: flex;
    justify-content: center;
    width: 100%;
    margin-bottom: 4px;
}

.crypto-app .holding-symbol { font-weight: 900; font-size: 1.3em; color: var(--text-primary); margin: 0; }
.crypto-app .holding-amount { font-size: 0.85em; color: var(--text-secondary); margin: 0; font-family: 'Courier New', monospace; }

.crypto-app .holding-value { font-size: 1.5rem; font-weight: 900; color: var(--success); margin: 0; }
.crypto-app .holding-price { color: var(--text-secondary); font-size: 0.85rem; margin: 0; display: flex; justify-content: center; align-items: center; gap: 6px; flex-wrap: wrap; }

.crypto-app .holding-left { display: none; }
.crypto-app .holding-right { display: none; }

.crypto-app .change-badge { padding: 2px 8px; border-radius: 999px; font-size: 0.85rem; }
.crypto-app .change-up { background: rgba(44,207,124,0.18); color: var(--success); border: 1px solid rgba(44,207,124,0.35); }
.crypto-app .change-down { background: rgba(255,77,79,0.18); color: var(--danger); border: 1px solid rgba(255,77,79,0.35); }

.crypto-app .mining-stats {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.crypto-app .notification {
    position: fixed;
    top: var(--spacing-2xl);
    right: var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    padding: var(--spacing-lg) var(--spacing-2xl);
    border-radius: 12px;
    box-shadow: 0 10px 24px rgba(0,0,0,0.35);
    z-index: 1000;
}

.crypto-app .notification.success { background: linear-gradient(135deg, var(--success), #16995c); }
.crypto-app .notification.error { background: linear-gradient(135deg, var(--danger), #d62c21); }
.crypto-app .notification.warning { background: linear-gradient(135deg, var(--warning), #d88c24); }

/* Modals: scope to crypto-empire body so placement doesn't matter */
.crypto-empire .modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.85);
    backdrop-filter: blur(4px);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.crypto-empire .modal.active { display: flex; }
.crypto-empire .modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    max-width: 720px;
    width: 92%;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0,0,0,0.6);
}

.crypto-empire .modal-header,
.crypto-empire .modal-body { padding: 24px 26px; }
.crypto-empire .modal-header { display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--border-color); position: sticky; top: 0; background: var(--bg-secondary); }
.crypto-empire .modal-close { 
  background: transparent; 
  color: var(--text-secondary); 
  font-size: 1.6rem; 
  border: none;
  padding: 8px 12px;
  cursor: pointer;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}
.crypto-empire .modal-close:hover {
  background: rgba(52, 84, 209, 0.15);
  color: var(--primary);
  transform: scale(1.1);
}
.crypto-empire .modal-close:active {
  transform: scale(0.95);
}

.crypto-empire .help-section { margin-bottom: 18px; padding-bottom: 16px; border-bottom: 1px solid var(--border-color); }
.crypto-empire .help-section h3 { color: var(--primary); margin-bottom: 8px; }

.crypto-app .quick-title { font-weight: 700; color: var(--text-secondary); }
.crypto-app .crypto-icon { width: 40px; height: 40px; border-radius: 10px; background: rgba(255,255,255,0.12); border: 1px solid rgba(255,255,255,0.2); display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0; }
.crypto-app .crypto-icon img { width: 28px; height: 28px; }
.crypto-app .crypto-icon.small { width: 32px; height: 32px; }
.crypto-app .crypto-icon.small img { width: 22px; height: 22px; }

@media (max-width: 1024px) {
    .crypto-app .sidebar { width: 240px; padding: var(--spacing-3xl) var(--spacing-lg); }
    .crypto-app { flex-direction: column; }
    .crypto-app .main-content { width: 100%; }
    .crypto-app .crypto-container { padding: var(--spacing-3xl); }
}

/* Tablet: 768px-1024px */
@media (min-width: 769px) and (max-width: 1024px) {
    .crypto-app {
        flex-direction: column;
        height: auto;
        overflow-y: auto;
    }
    
    .crypto-app .sidebar {
        width: 100%;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding: var(--spacing-lg);
        overflow: visible;
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
    
    .crypto-app .sidebar.collapsed {
        width: 100%;
        grid-template-columns: repeat(2, 1fr);
    }
    
    .crypto-app .nav-menu {
        grid-column: 1 / -1;
        display: flex;
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }
    
    .crypto-app .nav-button {
        flex: 1 1 calc(25% - var(--spacing-sm));
        justify-content: center;
        min-width: 90px;
        padding: var(--spacing-md) var(--spacing-sm);
        font-size: 0.85em;
    }
    
    .crypto-app .nav-label { display: inline; font-size: 0.8em; }
    .crypto-app .quick-actions { display: none; }
    .crypto-app .main-content { width: 100%; }
    .crypto-app .crypto-container {
        padding: var(--spacing-lg);
        overflow-y: auto;
        height: auto;
    }
    
    .crypto-app .shop-grid,
    .crypto-app .mining-grid,
    .crypto-app .crypto-grid,
    .crypto-app .dashboard-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .crypto-app .dashboard-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .crypto-app .miner-card,
    .crypto-app .shop-item,
    .crypto-app .crypto-card {
        padding: var(--spacing-md);
    }
    
    .crypto-app .holdings-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .crypto-empire.games-page header {
        padding: var(--spacing-lg);
        font-size: 1.2em;
    }
}

@media (max-width: 768px) {
    .crypto-app { flex-direction: column; height: auto; overflow: visible; }
    .crypto-app .sidebar { width: 100%; height: auto; border-right: none; border-bottom: 1px solid var(--border-color); overflow: visible; }
    .crypto-app .sidebar.collapsed { width: 100%; }
    .crypto-app .nav-menu { flex-direction: row; flex-wrap: wrap; gap: var(--spacing-sm); }
    .crypto-app .nav-button { flex: 1 1 calc(50% - var(--spacing-sm)); justify-content: center; min-width: 100px; }
    .crypto-app .nav-label { display: none; }
    .crypto-app .quick-actions { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--spacing-sm); }
    .crypto-app .crypto-container { padding: var(--spacing-lg); }
    .crypto-app .shop-grid,
    .crypto-app .mining-grid,
    .crypto-app .crypto-grid,
    .crypto-app .dashboard-grid { grid-template-columns: 1fr; }
}