/* Theme Variables */
:root {
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --background-color: #f8fafc;
    --card-background: #ffffff;
    --text-primary: #8487f4;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
}


/* Dark Theme Variables */
[data-theme="dark"] {
    --background-color: #0f172a;
    --card-background: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;
}

/* Theme Toggle Button */
.theme-toggle-btn {
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.1rem;
    position: relative;
    z-index: 10;
}

.theme-toggle-btn:hover {
    background-color: var(--primary-color);
    color: white;
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.theme-toggle-btn:active {
    transform: scale(0.95);
}

/* Body transition for smooth theme switching */
body {
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Light theme specific overrides */
[data-theme="light"] .pricing-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

[data-theme="light"] .product-features {
    background-color: #f8fafc;
    border: 1px solid #e2e8f0;
}

[data-theme="light"] .modal-container {
    background-color: white;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

[data-theme="light"] .modal-footer {
    background-color: #f3f4f6;
}

[data-theme="light"] .balance-info {
    background-color: #f3f4f6;
}

[data-theme="light"] .btn-cancel {
    background-color: #f3f4f6;
}

[data-theme="light"] .btn-cancel:hover {
    background-color: #e5e7eb;
}

[data-theme="light"] .form-control {
    background-color: white;
}

[data-theme="light"] .quantity-input input {
    background-color: white;
}

[data-theme="light"] .quantity-btn {
    background-color: white;
}

[data-theme="light"] .duration-select select {
    background-color: white;
}

/* Common dark theme styles */
.pricing-section {
    background: linear-gradient(135deg, #1e293b 0%, #334155 50%, #475569 100%);
    border: 1px solid var(--border-color);
}

.product-features {
    background-color: #334155;
    border: 1px solid var(--border-color);
}

.modal-container {
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
}

.modal-footer {
    background-color: #334155;
}

.balance-info {
    background-color: #334155;
    border: 1px solid var(--border-color);
}

.btn-cancel {
    background-color: #475569;
    border: 1px solid var(--border-color);
}

.btn-cancel:hover {
    background-color: #64748b;
}

.form-control {
    background-color: var(--card-background);
    color: var(--text-primary);
}

.quantity-input input {
    background-color: var(--card-background);
}

.quantity-btn {
    background-color: var(--card-background);
}

.duration-select select {
    background-color: var(--card-background);
}

/* Contact Buttons */
.contact-buttons {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    z-index: 1000;
}

.contact-btn {
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: 1.25rem;
    color: white;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    border: none;
    cursor: pointer;
}

.contact-btn:hover {
    transform: translateY(-2px) scale(1.1);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}

.contact-btn.facebook {
    background: linear-gradient(135deg, #1877f2, #42a5f5);
}

.contact-btn.zalo {
    background: linear-gradient(135deg, #0068ff, #00a8ff);
}

.contact-btn.telegram {
    background: linear-gradient(135deg, #0088cc, #229ed9);
}

.contact-btn:hover.facebook {
    background: linear-gradient(135deg, #166fe5, #3a9ae8);
}

.contact-btn:hover.zalo {
    background: linear-gradient(135deg, #0056cc, #0096e6);
}

.contact-btn:hover.telegram {
    background: linear-gradient(135deg, #0077b3, #1e8bc7);
}

/* Tooltip */
.contact-btn::after {
    content: attr(data-tooltip);
    position: absolute;
    right: 4.5rem;
    top: 50%;
    transform: translateY(-50%);
    background-color: var(--text-primary);
    color: var(--card-background);
    padding: 0.5rem 0.75rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    pointer-events: none;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.contact-btn::before {
    content: '';
    position: absolute;
    right: 3.75rem;
    top: 50%;
    transform: translateY(-50%);
    border: 6px solid transparent;
    border-left-color: var(--text-primary);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.contact-btn:hover::after,
.contact-btn:hover::before {
    opacity: 1;
    visibility: visible;
}

/* Mobile responsive */
@media (max-width: 768px) {
    .contact-buttons {
        bottom: 1rem;
        right: 1rem;
        gap: 0.5rem;
    }
    
    .contact-btn {
        width: 3rem;
        height: 3rem;
        font-size: 1rem;
    }
    
    .contact-btn::after {
        right: 3.5rem;
        font-size: 0.75rem;
        padding: 0.375rem 0.5rem;
    }
    
    .contact-btn::before {
        right: 2.75rem;
        border-width: 4px;
    }
}