:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --coin-color: #FFB800;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --border-radius: 12px;
    --border-radius-sm: 8px;
}

[data-theme="dark"] {
    --bg-primary: #1f2937;
    --bg-secondary: #111827;
    --bg-tertiary: #374151;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-tertiary: #9ca3af;
    --border-color: #374151;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

.page {
    display: none;
}

.page.active {
    display: block;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

.auth-card {
    background: var(--bg-primary);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 420px;
    animation: slideUp 0.4s ease;
}

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

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.logo h1 {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.auth-card h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    text-align: center;
}

.subtitle {
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 2rem;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.form-group input,
.form-group select {
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.input-with-prefix {
    position: relative;
    display: flex;
    align-items: center;
}

.input-with-prefix .prefix {
    position: absolute;
    left: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.input-with-prefix input {
    padding-left: 2.5rem;
    width: 100%;
}

.help-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--border-color);
}

.btn-block {
    width: 100%;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.auth-footer {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-secondary);
}

.auth-footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.auth-footer a:hover {
    text-decoration: underline;
}

.app-header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.app-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.header-left,
.header-center,
.header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-small {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.125rem;
}

.balance-display {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.balance-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 1.125rem;
}

.icon-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    transition: background-color var(--transition-fast);
}

.icon-btn:hover {
    background: var(--bg-tertiary);
}

.theme-icon {
    display: none;
}

[data-theme="light"] .sun-icon,
[data-theme="dark"] .moon-icon {
    display: block;
}

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-around;
    padding: 0.75rem 0;
    z-index: 100;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.75rem;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
    min-width: 70px;
}

.nav-item.active {
    color: var(--primary-color);
    background: var(--bg-secondary);
}

.nav-item svg {
    width: 24px;
    height: 24px;
}

.app-content {
    padding-bottom: 5rem;
    padding-top: 2rem;
    min-height: calc(100vh - 5rem);
}

.content-page {
    display: none;
}

.content-page.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.page-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg-primary);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.coin-icon {
    background: rgba(255, 184, 0, 0.1);
}

.usd-icon {
    background: rgba(16, 185, 129, 0.1);
}

.earning-icon {
    background: rgba(139, 92, 246, 0.1);
}

.stat-content {
    flex: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
}

.quick-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.action-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 1rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.section {
    margin-bottom: 2rem;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.transaction-list {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.transaction-item {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    transition: background-color var(--transition-fast);
}

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

.transaction-item:hover {
    background: var(--bg-secondary);
}

.transaction-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.transaction-icon.earn {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.transaction-icon.convert {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
}

.transaction-icon.withdraw {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
}

.transaction-details {
    flex: 1;
}

.transaction-title {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.transaction-date {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.transaction-amount {
    font-weight: 700;
    font-size: 1.125rem;
}

.transaction-amount.positive {
    color: var(--success-color);
}

.transaction-amount.negative {
    color: var(--text-primary);
}

.empty-state {
    padding: 3rem 1.5rem;
    text-align: center;
    color: var(--text-secondary);
}

.watch-container {
    max-width: 600px;
    margin: 0 auto;
}

.ad-player {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.ad-placeholder,
.ad-video {
    padding: 3rem 2rem;
    text-align: center;
}

.ad-placeholder svg {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.ad-placeholder p {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.ad-reward {
    color: var(--coin-color);
    font-weight: 600;
    font-size: 1.125rem;
}

.video-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.video-loader {
    width: 80px;
    height: 80px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

#ad-message {
    font-size: 1.125rem;
    font-weight: 600;
}

.ad-timer {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.watch-info {
    background: var(--bg-primary);
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
}

.info-label {
    color: var(--text-secondary);
}

.info-value {
    font-weight: 600;
}

.convert-container,
.withdraw-container {
    max-width: 600px;
    margin: 0 auto;
}

.conversion-card,
.withdraw-card {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    margin-bottom: 2rem;
}

.conversion-rate,
.balance-info {
    text-align: center;
    padding: 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--border-radius-sm);
    color: white;
    margin-bottom: 1.5rem;
}

.conversion-rate h2,
.balance-info h2 {
    font-size: 1.75rem;
    margin-top: 0.5rem;
}

.conversion-preview {
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: var(--border-radius-sm);
    margin: 1.5rem 0;
}

.preview-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
}

.preview-value {
    font-weight: 700;
    color: var(--primary-color);
}

.conversion-history,
.withdrawal-history {
    margin-top: 2rem;
}

.conversion-history h3,
.withdrawal-history h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.withdraw-notice {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--border-radius-sm);
    margin-top: 1rem;
    color: var(--primary-color);
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
}

.badge-pending {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
}

.settings-container {
    max-width: 700px;
    margin: 0 auto;
}

.settings-section {
    background: var(--bg-primary);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
}

.settings-section h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.settings-item {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

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

.settings-item label {
    display: block;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
    font-size: 0.875rem;
}

.settings-item p {
    font-weight: 600;
}

.settings-toggle {
    padding: 0.75rem 0;
}

.settings-toggle label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
}

.settings-toggle input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.kyc-status {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.kyc-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
}

.toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    opacity: 0;
    transition: all var(--transition-normal);
    max-width: 90%;
    text-align: center;
    font-weight: 500;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast.success {
    background: var(--success-color);
    color: white;
}

.toast.error {
    background: var(--danger-color);
    color: white;
}

.toast.warning {
    background: var(--warning-color);
    color: white;
}

@media (min-width: 768px) {
    .bottom-nav {
        position: static;
        justify-content: center;
        gap: 2rem;
        padding: 1rem 0;
    }
    
    .nav-item {
        flex-direction: row;
        font-size: 1rem;
        padding: 0.75rem 1.5rem;
    }
    
    .app-content {
        padding-bottom: 2rem;
    }
    
    .balance-display {
        gap: 2rem;
    }
}

@media (max-width: 640px) {
    .header-center {
        display: none;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .quick-actions {
        grid-template-columns: 1fr;
    }
}