/* style.css */
:root {
    /* Color Palette */
    --primary: #0088cc; /* Telegram Blue */
    --primary-dark: #0077b5;
    --primary-light: #3399ff;
    --secondary: #2ea043;
    --accent: #ff6b6b;
    --success: #00c851;
    --warning: #ffbb33;
    --danger: #ff4444;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-card: #ffffff;
    --bg-modal: rgba(0, 0, 0, 0.5);
    
    /* Text Colors */
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-light: #adb5bd;
    
    /* Shadows & Effects */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --glass-bg: rgba(255, 255, 255, 0.9);
    --glass-border: rgba(255, 255, 255, 0.2);
    
    /* Borders */
    --border-radius: 16px;
    --border-radius-sm: 8px;
    --border-radius-lg: 24px;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Dark Theme */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #121212;
        --bg-secondary: #1e1e1e;
        --bg-card: #2d2d2d;
        --text-primary: #ffffff;
        --text-secondary: #b3b3b3;
        --glass-bg: rgba(45, 45, 45, 0.9);
    }
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-tap-highlight-color: transparent;
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease;
}

.loading-content {
    text-align: center;
    color: white;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

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

/* App Container */
.app-container {
    max-width: 500px;
    margin: 0 auto;
    background: var(--bg-primary);
    min-height: 100vh;
    position: relative;
    padding-bottom: 70px;
}

/* Header */
.app-header {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    padding: var(--spacing-md);
    border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo i {
    font-size: 24px;
    color: #ffd700;
}

.logo h1 {
    font-size: 20px;
    font-weight: 700;
}

.user-balance {
    background: rgba(255, 255, 255, 0.2);
    padding: 8px 16px;
    border-radius: 50px;
    backdrop-filter: blur(10px);
    font-weight: 600;
    transition: var(--transition-fast);
}

.user-balance:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-1px);
}

.header-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

.stat-card {
    background: rgba(255, 255, 255, 0.1);
    padding: 12px;
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition-fast);
}

.stat-card:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

.stat-card i {
    font-size: 20px;
    color: #ffd700;
}

.stat-card small {
    font-size: 10px;
    opacity: 0.9;
}

.stat-card p {
    font-size: 14px;
    font-weight: 600;
}

/* Main Content */
.main-content {
    padding: var(--spacing-md);
}

.page {
    display: none;
    animation: fadeIn 0.3s ease;
}

.page.active {
    display: block;
}

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

/* Welcome Card */
.welcome-card {
    background: linear-gradient(135deg, var(--glass-bg), var(--bg-card));
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.welcome-text h2 {
    font-size: 20px;
    margin-bottom: 4px;
}

.welcome-text p {
    color: var(--text-secondary);
    font-size: 14px;
}

.welcome-avatar i {
    font-size: 48px;
    color: var(--primary);
}

/* Quick Actions */
.quick-actions {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.action-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    border: 1px solid transparent;
}

.action-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.action-card:active {
    transform: translateY(-2px);
}

.action-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 8px;
    font-size: 18px;
    color: white;
}

.task-icon { background: linear-gradient(135deg, #667eea, #764ba2); }
.refer-icon { background: linear-gradient(135deg, #f093fb, #f5576c); }
.withdraw-icon { background: linear-gradient(135deg, #4facfe, #00f2fe); }
.profile-icon { background: linear-gradient(135deg, #43e97b, #38f9d7); }

.action-card span {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-primary);
}

/* Tasks Preview */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.section-header h3 {
    font-size: 18px;
    font-weight: 600;
}

.section-header a {
    color: var(--primary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
}

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

.task-item {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-fast);
    box-shadow: var(--shadow-sm);
    border: 1px solid transparent;
}

.task-item:hover {
    border-color: var(--primary-light);
    transform: translateX(2px);
}

.task-info h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 4px;
}

.task-info p {
    font-size: 12px;
    color: var(--text-secondary);
}

.task-reward {
    background: linear-gradient(135deg, #ffd700, #ffb347);
    color: white;
    padding: 6px 12px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Page Header */
.page-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.back-button {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 20px;
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

.back-button:hover {
    background: var(--bg-secondary);
}

.page-header h2 {
    font-size: 22px;
    font-weight: 700;
}

/* Tasks Container */
.tasks-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* Referral Content */
.referral-card {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
}

.referral-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.referral-header i {
    font-size: 32px;
    color: #ffd700;
}

.referral-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.referral-stat {
    text-align: center;
    background: rgba(255, 255, 255, 0.1);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
}

.stat-value {
    display: block;
    font-size: 28px;
    font-weight: 700;
    color: #ffd700;
}

.stat-label {
    font-size: 12px;
    opacity: 0.9;
}

.referral-link-container {
    display: flex;
    gap: var(--spacing-sm);
    margin: var(--spacing-lg) 0;
}

#referralLink {
    flex: 1;
    padding: 12px 16px;
    border: none;
    border-radius: var(--border-radius);
    background: rgba(255, 255, 255, 0.9);
    font-family: monospace;
    font-size: 14px;
}

.copy-btn {
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    width: 50px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.copy-btn:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

.share-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.share-btn {
    padding: 12px;
    border: none;
    border-radius: var(--border-radius);
    color: white;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition-fast);
}

.share-btn.telegram {
    background: #0088cc;
}

.share-btn.copy {
    background: var(--secondary);
}

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

/* Withdraw Content */
.balance-card {
    background: linear-gradient(135deg, #43e97b, #38f9d7);
    color: white;
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
}

.balance-amount {
    font-size: 36px;
    font-weight: 700;
    margin: 8px 0;
}

.min-withdraw {
    opacity: 0.9;
    font-size: 14px;
}

.withdraw-form {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--bg-secondary);
    border-radius: var(--border-radius);
    font-size: 16px;
    transition: var(--transition-fast);
    background: var(--bg-primary);
    color: var(--text-primary);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 136, 204, 0.1);
}

.method-selector {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

.method-option {
    position: relative;
}

.method-option input {
    display: none;
}

.method-option label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition-fast);
    border: 2px solid transparent;
}

.method-option input:checked + label {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.method-option label i {
    font-size: 20px;
}

.submit-btn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition-fast);
}

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

.submit-btn:active {
    transform: translateY(0);
}

/* Profile Content */
.profile-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.profile-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.profile-avatar i {
    font-size: 64px;
    color: var(--primary);
}

.profile-info h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 4px;
}

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

.profile-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.profile-stat {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
}

.profile-stat i {
    font-size: 24px;
    color: var(--primary);
    margin-bottom: 8px;
}

.profile-stat small {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.profile-stat p {
    font-size: 16px;
    font-weight: 600;
}

.profile-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.profile-action {
    background: var(--bg-card);
    border: none;
    padding: 16px;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    transition: var(--transition-fast);
    color: var(--text-primary);
    text-align: left;
    box-shadow: var(--shadow-sm);
}

.profile-action:hover {
    background: var(--bg-secondary);
    transform: translateX(4px);
}

.profile-action i:first-child {
    margin-right: 12px;
    color: var(--primary);
}

.logout-btn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #ff6b6b, #ff8e8e);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition-fast);
}

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

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-card);
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    padding: 12px;
    border-top: 1px solid var(--bg-secondary);
    backdrop-filter: blur(10px);
    z-index: 1000;
    max-width: 500px;
    margin: 0 auto;
}

.nav-item {
    background: none;
    border: none;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--border-radius-sm);
    transition: var(--transition-fast);
}

.nav-item.active {
    color: var(--primary);
    background: rgba(0, 136, 204, 0.1);
}

.nav-item i {
    font-size: 20px;
}

.nav-item span {
    font-size: 10px;
    font-weight: 500;
}

/* Toast Notification */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 16px 24px;
    background: var(--bg-card);
    color: var(--text-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    z-index: 9999;
    transform: translateX(150%);
    transition: transform 0.3s ease;
    max-width: 300px;
    border-left: 4px solid var(--primary);
}

.toast.show {
    transform: translateX(0);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-modal);
    z-index: 9998;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    width: 100%;
    max-width: 400px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from { transform: translateY(50px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--bg-secondary);
}

.modal-header h3 {
    font-size: 20px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 28px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

.modal-close:hover {
    color: var(--danger);
}

.modal-body {
    padding: var(--spacing-lg);
}

.task-reward {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: linear-gradient(135deg, #ffd700, #ffb347);
    color: white;
    border-radius: 50px;
    font-weight: 600;
    margin: var(--spacing-md) 0;
}

.task-instructions {
    margin: var(--spacing-lg) 0;
}

.task-instructions h4 {
    margin-bottom: 8px;
    font-weight: 600;
}

.task-instructions ol {
    padding-left: 20px;
}

.task-instructions li {
    margin-bottom: 8px;
    font-size: 14px;
    color: var(--text-secondary);
}

.task-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.task-action-btn {
    padding: 16px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition-fast);
}

.start-btn {
    background: linear-gradient(135deg, var(--success), #00d25a);
    color: white;
}

.check-btn {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
}

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

/* Skeleton Loading */
.skeleton {
    background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--bg-card) 50%, var(--bg-secondary) 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
    border-radius: var(--border-radius);
}

@keyframes loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Responsive Design */
@media (max-width: 480px) {
    .app-container {
        padding-bottom: 80px;
    }
    
    .header-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-xs);
    }
    
    .stat-card {
        padding: 8px;
    }
    
    .stat-card p {
        font-size: 12px;
    }
    
    .quick-actions {
        grid-template-columns: repeat(4, 1fr);
        gap: var(--spacing-xs);
    }
    
    .action-card {
        padding: var(--spacing-sm);
    }
    
    .action-icon {
        width: 32px;
        height: 32px;
        font-size: 14px;
    }
    
    .action-card span {
        font-size: 10px;
    }
    
    .referral-stats {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .share-buttons {
        grid-template-columns: 1fr;
    }
}

/* Animation for task completion */
@keyframes confetti {
    0% { transform: translateY(0) rotate(0deg); opacity: 1; }
    100% { transform: translateY(-100vh) rotate(360deg); opacity: 0; }
}

/* Smooth scroll */
::-webkit-scrollbar {
    width: 6px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 3px;
}

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