/* =============================================
   TRANG LIÊN HỆ - CONTACT PAGE
   ============================================= */

/* Hero Section */
.contact-hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 4rem 0;
    color: white;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.contact-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="contactPattern" width="30" height="30" patternUnits="userSpaceOnUse"><circle cx="15" cy="15" r="1.5" fill="white" opacity="0.15"/></pattern></defs><rect width="100" height="100" fill="url(%23contactPattern)"/></svg>');
    pointer-events: none;
}

.contact-hero .container {
    position: relative;
    z-index: 2;
}

/* Contact Sections */
.contact-section {
    padding: 4rem 0;
}

/* Contact Cards */
.contact-card {
    background: white;
    border-radius: 1rem;
    padding: 2.5rem;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    margin-bottom: 2rem;
    height: 100%;
    transition: all 0.3s ease;
    border: 1px solid rgba(0,0,0,0.05);
}

.contact-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.contact-icon {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 1.8rem;
    color: white;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.contact-card:hover .contact-icon {
    transform: scale(1.1);
    box-shadow: 0 10px 25px rgba(0,0,0,0.3);
}

.contact-icon.primary { 
    background: linear-gradient(135deg, #667eea, #764ba2); 
}

.contact-icon.success { 
    background: linear-gradient(135deg, #56ab2f, #a8e6cf); 
}

.contact-icon.info { 
    background: linear-gradient(135deg, #4facfe, #00f2fe); 
}

.contact-icon.warning { 
    background: linear-gradient(135deg, #f093fb, #f5576c); 
}

.contact-card h5 {
    color: #2c3e50;
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.contact-card p {
    color: #6c757d;
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.contact-card strong {
    color: #2c3e50;
}

/* Contact Form */
.contact-form-section .contact-card {
    max-width: 800px;
    margin: 0 auto;
}

.form-control,
.form-select {
    border-radius: 0.5rem;
    border: 2px solid #e9ecef;
    padding: 0.75rem 1rem;
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

.form-control:focus,
.form-select:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
    transform: translateY(-1px);
}

.form-label {
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.form-control::placeholder {
    color: #adb5bd;
    font-style: italic;
}

/* Contact Form Buttons */
.btn-primary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    border: none;
    padding: 0.75rem 2rem;
    font-weight: 600;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #5a67d8, #6b46c1);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
}

/* FAQ Section */
.faq-section {
    background-color: #f8f9fa;
}

.faq-item {
    border: none;
    margin-bottom: 1rem;
    border-radius: 0.75rem;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.faq-item:hover {
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.faq-header {
    background: white;
    border: none;
    padding: 1.5rem 2rem;
    font-weight: 600;
    text-align: left;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
    color: #2c3e50;
    font-size: 1.05rem;
}

.faq-header:hover {
    background-color: #f8f9fa;
    color: #667eea;
}

.faq-header:focus {
    box-shadow: none;
    background-color: #f8f9fa;
}

.faq-header i {
    transition: transform 0.3s ease;
    color: #667eea;
}

.faq-header[aria-expanded="true"] i {
    transform: rotate(180deg);
}

.faq-body {
    background: white;
    border-top: 1px solid #e9ecef;
    padding: 1.5rem 2rem;
    color: #6c757d;
    line-height: 1.6;
}

/* Animation for FAQ */
.collapse {
    transition: height 0.3s ease;
}

/* Loading Animation */
.btn .fa-spinner {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Success/Error States */
.form-control.is-valid {
    border-color: #28a745;
}

.form-control.is-invalid {
    border-color: #dc3545;
}

.valid-feedback {
    color: #28a745;
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.invalid-feedback {
    color: #dc3545;
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

/* Responsive Design */
@media (max-width: 992px) {
    .contact-hero {
        padding: 3rem 0;
    }
    
    .contact-section {
        padding: 3rem 0;
    }
    
    .contact-card {
        padding: 2rem;
    }
    
    .contact-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
}

@media (max-width: 768px) {
    .contact-hero {
        padding: 2rem 0;
    }
    
    .contact-hero h1 {
        font-size: 2rem;
    }
    
    .contact-section {
        padding: 2rem 0;
    }
    
    .contact-card {
        padding: 1.5rem;
        margin-bottom: 1.5rem;
    }
    
    .contact-icon {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
        margin-bottom: 1rem;
    }
    
    .faq-header {
        padding: 1rem 1.5rem;
        font-size: 1rem;
    }
    
    .faq-body {
        padding: 1rem 1.5rem;
    }
    
    .form-control,
    .form-select {
        padding: 0.6rem 0.8rem;
    }
}

@media (max-width: 576px) {
    .contact-hero .lead {
        font-size: 1rem;
    }
    
    .contact-card {
        padding: 1.25rem;
    }
    
    .faq-header {
        padding: 0.875rem 1.25rem;
        font-size: 0.95rem;
    }
    
    .faq-body {
        padding: 0.875rem 1.25rem;
        font-size: 0.9rem;
    }
    
    .btn-primary {
        padding: 0.6rem 1.5rem;
        font-size: 0.95rem;
    }
}

/* Additional Enhancements */
.contact-card .fas,
.contact-card .far {
    margin-right: 0.5rem;
    color: #667eea;
}

.contact-section .section-title {
    margin-bottom: 3rem;
}

.contact-section .section-title h2 {
    color: #2c3e50;
    font-weight: 700;
}

.contact-section .section-title p {
    color: #6c757d;
    font-size: 1.1rem;
}

/* Hover effects for better UX */
.form-group {
    position: relative;
}

.form-floating {
    position: relative;
}

.form-floating .form-control:focus ~ label,
.form-floating .form-control:not(:placeholder-shown) ~ label {
    opacity: 0.65;
    transform: scale(0.85) translateY(-0.5rem) translateX(0.15rem);
}

/* Custom scrollbar for textarea */
.form-control[rows] {
    resize: vertical;
    min-height: 120px;
}

.form-control[rows]::-webkit-scrollbar {
    width: 6px;
}

.form-control[rows]::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 3px;
}

.form-control[rows]::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 3px;
}

.form-control[rows]::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}