/**
 * Optimized Design System for TAP Mini App
 * Focus on conversion-driven UX with clear action hierarchy
 */

/* ============ OPTIMIZED NAVIGATION SYSTEM ============ */

.bottom-nav-optimized {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(180deg, transparent 0%, #0F0F23 20%);
    /* Improved browser compatibility */
    background: -webkit-linear-gradient(180deg, transparent 0%, #0F0F23 20%);
    background: -moz-linear-gradient(180deg, transparent 0%, #0F0F23 20%);
    
    /* Enhanced backdrop filter with fallbacks */
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    /* Fallback for unsupported browsers */
    background-color: rgba(15, 15, 35, 0.9);
    
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 8px 16px;
    /* Safe area handling with fallbacks */
    padding-bottom: calc(8px + env(safe-area-inset-bottom, 8px));
    padding-bottom: calc(8px + constant(safe-area-inset-bottom));
    
    display: flex;
    justify-content: space-around;
    align-items: flex-end;
    z-index: 1000;
    
    /* Browser-specific fixes */
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
    will-change: transform;
}

.nav-item-opt {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 8px 12px;
    border: none;
    background: transparent;
    color: #65676B;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    min-width: 60px;
    
    /* Browser compatibility */
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    
    /* Touch optimizations */
    -webkit-touch-callout: none;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.nav-item-opt.primary {
    background: linear-gradient(135deg, #E94560 0%, #F39C12 100%);
    background: -webkit-linear-gradient(135deg, #E94560 0%, #F39C12 100%);
    background: -moz-linear-gradient(135deg, #E94560 0%, #F39C12 100%);
    border-radius: 20px;
    color: white;
    padding: 12px 20px;
    transform: translateY(-8px);
    -webkit-transform: translateY(-8px);
    box-shadow: 0 4px 20px rgba(233, 69, 96, 0.4);
    -webkit-box-shadow: 0 4px 20px rgba(233, 69, 96, 0.4);
}

.nav-item-opt.primary:hover {
    transform: translateY(-12px);
    box-shadow: var(--glow-primary), var(--shadow-strong);
}

.nav-item-opt.active {
    color: var(--accent-gold);
}

.nav-item-opt.active .nav-indicator {
    opacity: 1;
    transform: scale(1);
}

.nav-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-xs);
    transition: all var(--transition-medium);
}

.nav-icon.primary-icon {
    width: 28px;
    height: 28px;
    font-size: 1.2rem;
}

.nav-label {
    font-size: 0.7rem;
    font-weight: 500;
    text-align: center;
    line-height: 1;
}

.nav-badge {
    position: absolute;
    top: -4px;
    right: 8px;
    background: var(--accent-gold);
    color: var(--bg-primary);
    font-size: 0.6rem;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 10px;
    white-space: nowrap;
}

.nav-indicator {
    position: absolute;
    bottom: -2px;
    width: 4px;
    height: 4px;
    background: var(--accent-gold);
    border-radius: 50%;
    opacity: 0;
    transform: scale(0);
    transition: all var(--transition-medium);
}

/* ============ INTEGRATED TASKS/INVITE DESIGN ============ */

.primary-actions {
    display: grid;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.action-card {
    background: var(--bg-card);
    border-radius: 20px;
    padding: var(--space-xl);
    border: 2px solid transparent;
    transition: all var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.action-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-gold), var(--primary-light));
    opacity: 0;
    transition: opacity var(--transition-medium);
}

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

.action-card:hover::before {
    opacity: 1;
}

.invite-card-integrated {
    background: linear-gradient(135deg, var(--bg-card) 0%, rgba(246, 211, 101, 0.05) 100%);
    border-color: rgba(246, 211, 101, 0.3);
}

.invite-card-integrated::before {
    background: var(--accent-gold-gradient);
    opacity: 1;
}

.channel-card {
    background: linear-gradient(135deg, var(--bg-card) 0%, rgba(102, 126, 234, 0.05) 100%);
    border-color: rgba(102, 126, 234, 0.3);
}

.action-card {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: var(--space-lg);
    align-items: center;
}

.action-icon {
    font-size: 2.5rem;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-glass);
    border-radius: 50%;
    backdrop-filter: blur(10px);
}

.action-content h3 {
    margin: 0 0 var(--space-xs) 0;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
}

.action-content p {
    margin: 0 0 var(--space-sm) 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.reward-text {
    color: var(--accent-gold) !important;
    font-weight: 600;
}

.action-stats {
    display: flex;
    gap: var(--space-md);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.action-stats strong {
    color: var(--text-primary);
}

.reward-display {
    background: var(--accent-green);
    color: white;
    padding: var(--space-xs) var(--space-sm);
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 600;
    display: inline-block;
}

.action-btn {
    background: var(--primary-gradient);
    color: white;
    border: none;
    padding: var(--space-md) var(--space-lg);
    border-radius: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-medium);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    white-space: nowrap;
}

.action-btn.primary {
    background: var(--accent-gold-gradient);
    color: var(--bg-primary);
    box-shadow: var(--glow-accent);
}

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

.action-btn.primary:hover {
    box-shadow: var(--glow-accent), var(--shadow-medium);
}

/* ============ COMPLETED TASKS SECTION ============ */

.completed-section {
    margin-top: var(--space-xxl);
}

.completed-section h3 {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    font-size: 1rem;
}

.completed-tasks {
    display: grid;
    gap: var(--space-md);
}

.task-item {
    background: var(--bg-secondary);
    border-radius: 15px;
    padding: var(--space-lg);
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: var(--space-md);
    align-items: center;
    opacity: 0.7;
}

.task-item.completed {
    border: 1px solid rgba(66, 230, 149, 0.3);
}

.task-icon {
    font-size: 1.5rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.task-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.task-name {
    font-weight: 500;
    color: var(--text-primary);
}

.task-reward {
    font-size: 0.8rem;
    color: var(--accent-green);
    font-weight: 600;
}

.task-status {
    color: var(--accent-green);
    font-size: 1.2rem;
    font-weight: 600;
}

/* ============ MODAL SYSTEM ============ */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 1;
    transition: all var(--transition-medium);
    padding: var(--space-lg);
}

.modal-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    background: var(--bg-card);
    border-radius: 25px;
    width: 100%;
    max-width: 400px;
    max-height: 80vh;
    overflow-y: auto;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-strong);
    transform: scale(1);
    transition: transform var(--transition-medium);
}

.modal-overlay.hidden .modal-content {
    transform: scale(0.95);
}

.modal-header {
    padding: var(--space-xl) var(--space-xl) var(--space-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.2rem;
    cursor: pointer;
    padding: var(--space-sm);
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--interactive-hover);
    color: var(--text-primary);
}

/* ============ INVITE MODAL SPECIFIC ============ */

.invite-modal {
    max-width: 450px;
}

.invite-reward-showcase {
    padding: var(--space-xl);
    text-align: center;
    background: linear-gradient(135deg, rgba(246, 211, 101, 0.1), rgba(246, 211, 101, 0.05));
}

.reward-visual {
    margin-bottom: var(--space-lg);
}

.reward-amount {
    font-size: 3rem;
    font-weight: 800;
    color: var(--accent-gold);
    text-shadow: var(--glow-accent);
    line-height: 1;
}

.reward-label {
    font-size: 1.1rem;
    color: var(--text-primary);
    font-weight: 600;
}

.reward-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.invite-link-section {
    padding: var(--space-xl);
}

.invite-link-display {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.invite-link-display input {
    flex: 1;
    background: var(--bg-secondary);
    border: 2px solid transparent;
    border-radius: 12px;
    padding: var(--space-md);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-family: 'JetBrains Mono', monospace;
}

.invite-link-display input:focus {
    border-color: var(--primary-light);
    outline: none;
}

.copy-btn {
    background: var(--accent-gold);
    border: none;
    border-radius: 12px;
    padding: var(--space-md);
    color: var(--bg-primary);
    cursor: pointer;
    transition: all var(--transition-medium);
    min-width: 50px;
}

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

.invite-actions {
    display: grid;
    gap: var(--space-md);
}

.share-btn {
    background: var(--bg-secondary);
    border: 2px solid transparent;
    border-radius: 15px;
    padding: var(--space-lg);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-medium);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    font-weight: 600;
}

.share-btn.telegram {
    background: linear-gradient(135deg, #229ED9, #0088cc);
    color: white;
    border-color: #229ED9;
}

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

.leaderboard-preview {
    padding: var(--space-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.leaderboard-preview h4 {
    margin: 0 0 var(--space-lg) 0;
    color: var(--text-primary);
    text-align: center;
}

/* ============ MORE MODAL ============ */

.more-modal {
    max-width: 350px;
}

.more-options-grid {
    padding: var(--space-xl);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
}

.more-option {
    background: var(--bg-secondary);
    border: 2px solid transparent;
    border-radius: 20px;
    padding: var(--space-xl) var(--space-lg);
    cursor: pointer;
    transition: all var(--transition-medium);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    color: var(--text-primary);
    text-decoration: none;
}

.more-option:hover {
    border-color: var(--primary-light);
    transform: translateY(-4px);
    box-shadow: var(--shadow-soft);
}

.more-option i {
    font-size: 1.5rem;
    color: var(--accent-gold);
}

.more-option span {
    font-weight: 500;
    font-size: 0.9rem;
}

/* ============ MORE SCREEN ============ */

.more-features-grid {
    display: grid;
    gap: var(--space-lg);
    padding: var(--space-lg);
}

.feature-card {
    background: var(--bg-card);
    border-radius: 20px;
    padding: var(--space-xl);
    text-align: center;
    border: 2px solid transparent;
    transition: all var(--transition-medium);
    cursor: pointer;
}

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

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--space-lg);
}

.feature-card h3 {
    margin: 0 0 var(--space-md) 0;
    color: var(--text-primary);
}

.feature-card p {
    margin: 0 0 var(--space-lg) 0;
    color: var(--text-secondary);
}

.feature-btn {
    background: var(--primary-gradient);
    border: none;
    border-radius: 15px;
    padding: var(--space-md) var(--space-xl);
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-medium);
}

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

/* ============ RESPONSIVE OPTIMIZATIONS ============ */

@media (max-width: 768px) {
    .bottom-nav-optimized {
        padding: var(--space-xs) var(--space-sm) calc(var(--space-sm) + env(safe-area-inset-bottom));
    }
    
    .nav-item-opt {
        min-width: 50px;
        padding: var(--space-xs) var(--space-sm);
    }
    
    .nav-item-opt.primary {
        padding: var(--space-sm) var(--space-md);
    }
    
    .nav-label {
        font-size: 0.65rem;
    }
    
    .nav-badge {
        font-size: 0.55rem;
        padding: 1px 4px;
    }
    
    .action-card {
        grid-template-columns: auto 1fr;
        grid-template-rows: auto auto;
        gap: var(--space-md);
    }
    
    .action-btn {
        grid-column: 1 / -1;
        justify-self: center;
    }
    
    .more-options-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
}

/* ============ ANIMATION ENHANCEMENTS ============ */

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

.action-card {
    animation: slideInUp var(--transition-medium) ease-out;
}

.action-card:nth-child(2) {
    animation-delay: 0.1s;
}

.action-card:nth-child(3) {
    animation-delay: 0.2s;
}

/* ============ ACCESSIBILITY IMPROVEMENTS ============ */

.nav-item-opt:focus,
.action-btn:focus,
.modal-close:focus {
    outline: 2px solid var(--accent-gold);
    outline-offset: 2px;
}

.modal-overlay {
    scroll-behavior: smooth;
}

/* ============ LOADING STATES ============ */

.action-btn.loading {
    pointer-events: none;
    opacity: 0.7;
}

.action-btn.loading::after {
    content: '';
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: var(--space-sm);
}