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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: all 0.3s ease;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo h2 {
    color: #2563eb;
    font-weight: 700;
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: #2563eb;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #2563eb;
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.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 1000 1000"><polygon fill="rgba(255,255,255,0.1)" points="0,1000 1000,0 1000,1000"/></svg>');
    background-size: cover;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 1rem;
    color: #e2e8f0;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: #cbd5e0;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 30px;
    border: none;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s ease;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: #2563eb;
    color: white;
}

.btn-primary:hover {
    background: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: white;
    color: #2563eb;
    transform: translateY(-2px);
}

.hero-graphic {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 400px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.hero-graphic i {
    font-size: 8rem;
    color: white;
    opacity: 0.8;
}

/* Services Section */
.services {
    padding: 100px 0;
    background: #f8fafc;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 1rem;
}

.section-header p {
    font-size: 1.2rem;
    color: #64748b;
    max-width: 600px;
    margin: 0 auto;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.service-card {
    background: white;
    padding: 2.5rem;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid #e2e8f0;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.service-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.service-icon i {
    font-size: 2rem;
    color: white;
}

.service-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 1rem;
}

.service-card p {
    color: #64748b;
    line-height: 1.6;
}

/* About Section */
.about {
    padding: 100px 0;
    background: white;
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 1.5rem;
}

.about-text p {
    font-size: 1.1rem;
    color: #64748b;
    margin-bottom: 2rem;
    line-height: 1.7;
}

.about-features {
    display: grid;
    gap: 1rem;
}

.feature {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.feature i {
    color: #10b981;
    font-size: 1.2rem;
}

.feature span {
    color: #374151;
    font-weight: 500;
}

.about-stats {
    display: grid;
    gap: 2rem;
}

.stat {
    text-align: center;
    padding: 2rem;
    background: #f8fafc;
    border-radius: 15px;
    border: 1px solid #e2e8f0;
}

.stat h3 {
    font-size: 3rem;
    font-weight: 700;
    color: #2563eb;
    margin-bottom: 0.5rem;
}

.stat p {
    color: #64748b;
    font-weight: 500;
}

/* Contact Section */
.contact {
    padding: 100px 0;
    background: #f8fafc;
}

.contact-content {
    display: flex;
    justify-content: center;
    margin-top: 3rem;
}

.contact-form {
    width: 100%;
    max-width: 600px;
    background: white;
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #2563eb;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* Footer */
.footer {
    background: #1e293b;
    color: white;
    padding: 50px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
    color: white;
}

.footer-section p {
    color: #94a3b8;
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: #94a3b8;
    text-decoration: none;
    transition: all 0.3s ease;
}

.footer-section ul li a:hover {
    color: #2563eb;
    transform: translateX(5px);
}

.service-link {
    cursor: pointer;
    position: relative;
}

.service-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    transition: width 0.3s ease;
}

.service-link:hover::after {
    width: 100%;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: #374151;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: #2563eb;
    transform: translateY(-2px);
}

.social-links a[href*="youtube"]:hover {
    background: #ff0000;
}

.social-links a[href*="facebook"]:hover {
    background: #1877f2;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #374151;
    color: #94a3b8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        margin: 1rem 0;
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-buttons {
        justify-content: center;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .contact-content {
        margin-top: 2rem;
    }
    
    .contact-form {
        max-width: 100%;
        padding: 2rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }

    .social-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .service-card,
    .contact-form {
        padding: 1.5rem;
    }

    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Loading animation */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Hover effects */
.service-card:hover .service-icon {
    transform: scale(1.1);
}

.contact-item:hover {
    transform: translateX(5px);
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #2563eb;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #1d4ed8;
}

/* AOS Custom Animations */
[data-aos] {
    pointer-events: none;
}

[data-aos].aos-animate {
    pointer-events: auto;
}

/* Enhanced AOS animations */
[data-aos="fade-up"] {
    transform: translateY(50px);
    opacity: 0;
}

[data-aos="fade-right"] {
    transform: translateX(-50px);
    opacity: 0;
}

[data-aos="fade-left"] {
    transform: translateX(50px);
    opacity: 0;
}

[data-aos="zoom-in"] {
    transform: scale(0.8);
    opacity: 0;
}

/* Smooth transitions for all AOS elements */
[data-aos] {
    transition-property: transform, opacity;
    transition-timing-function: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* Staggered animation delays for service cards */
.service-card:nth-child(1) { animation-delay: 0.1s; }
.service-card:nth-child(2) { animation-delay: 0.2s; }
.service-card:nth-child(3) { animation-delay: 0.3s; }
.service-card:nth-child(4) { animation-delay: 0.4s; }
.service-card:nth-child(5) { animation-delay: 0.5s; }
.service-card:nth-child(6) { animation-delay: 0.6s; }

/* Form loading state */
.btn-loading {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none !important;
}

.btn:disabled:hover {
    transform: none !important;
    box-shadow: none !important;
}

/* Form validation styles */
.form-group input:invalid,
.form-group textarea:invalid {
    border-color: #ef4444;
}

.form-group input:valid,
.form-group textarea:valid {
    border-color: #10b981;
}

/* Loading spinner animation */
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.fa-spinner {
    animation: spin 1s linear infinite;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 10000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    backdrop-filter: blur(10px);
    animation: fadeIn 0.4s ease;
}

.modal-content {
    background: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);
    margin: 3% auto;
    padding: 0;
    border-radius: 24px;
    width: 92%;
    max-width: 900px;
    max-height: 94vh;
    overflow-y: auto;
    box-shadow: 
        0 25px 80px rgba(0, 0, 0, 0.15),
        0 0 0 1px rgba(255, 255, 255, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    animation: slideInUp 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.modal-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 25px 35px;
    border-radius: 24px 24px 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.modal-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(255, 255, 255, 0.1) 0%, transparent 50%, rgba(255, 255, 255, 0.1) 100%);
    animation: shimmer 2s infinite;
}

.modal-header h2 {
    margin: 0;
    font-size: 1.6rem;
    font-weight: 700;
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.close {
    color: white;
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.2);
    position: relative;
    z-index: 1;
    backdrop-filter: blur(10px);
}

.close:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.modal-body {
    padding: 40px;
    background: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);
}

.service-detail {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 35px;
    align-items: start;
}

.service-icon-large {
    width: 140px;
    height: 140px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 
        0 15px 40px rgba(102, 126, 234, 0.25),
        0 0 0 1px rgba(255, 255, 255, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
}

.service-icon-large::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(255, 255, 255, 0.1) 0%, transparent 50%, rgba(255, 255, 255, 0.1) 100%);
    animation: shimmer 3s infinite;
}

.service-icon-large i {
    font-size: 3.5rem;
    color: white;
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.service-info h3 {
    color: #1e293b;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #1e293b 0%, #475569 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.service-description {
    color: #64748b;
    font-size: 1.15rem;
    line-height: 1.7;
    margin-bottom: 30px;
    background: linear-gradient(145deg, #f8fafc 0%, #ffffff 100%);
    padding: 20px;
    border-radius: 16px;
    border: 1px solid rgba(226, 232, 240, 0.5);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.service-features,
.service-benefits,
.service-pricing {
    margin-bottom: 30px;
    background: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);
    padding: 25px;
    border-radius: 16px;
    border: 1px solid rgba(226, 232, 240, 0.5);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.service-features h4,
.service-benefits h4,
.service-pricing h4 {
    color: #1e293b;
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.service-features h4::before,
.service-benefits h4::before {
    content: "✨";
    font-size: 1.2rem;
}

.service-pricing h4::before {
    content: "💰";
    font-size: 1.2rem;
}

.service-features ul,
.service-benefits ul {
    list-style: none;
    padding: 0;
}

.service-features li,
.service-benefits li {
    color: #64748b;
    padding: 12px 0;
    padding-left: 30px;
    position: relative;
    line-height: 1.6;
    font-size: 1.05rem;
    transition: all 0.3s ease;
}

.service-features li:hover,
.service-benefits li:hover {
    color: #1e293b;
    transform: translateX(5px);
}

.service-features li::before,
.service-benefits li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #10b981;
    font-weight: bold;
    font-size: 1.2rem;
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 2px 4px rgba(16, 185, 129, 0.2);
}

.service-pricing p {
    color: #2563eb;
    font-weight: 700;
    font-size: 1.2rem;
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    padding: 20px;
    border-radius: 12px;
    border-left: 4px solid #2563eb;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.1);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.service-pricing p::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: shimmer 2s infinite;
}

.modal-footer {
    padding: 25px 35px;
    border-top: 1px solid rgba(226, 232, 240, 0.5);
    display: flex;
    gap: 15px;
    justify-content: flex-end;
    background: linear-gradient(145deg, #f8fafc 0%, #ffffff 100%);
    border-radius: 0 0 24px 24px;
}

/* Modal Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideInUp {
    from {
        transform: translateY(60px) scale(0.95);
        opacity: 0;
    }
    to {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

/* Service Cards Hover Effect */
.service-card {
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.service-card:hover::before {
    left: 100%;
}

.service-card:hover {
    transform: translateY(-12px) scale(1.03);
    box-shadow: 
        0 25px 50px rgba(0, 0, 0, 0.15),
        0 0 0 1px rgba(102, 126, 234, 0.1);
}

.service-card:hover .service-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 15px 35px rgba(102, 126, 234, 0.4);
}

/* Responsive Modal */
@media (max-width: 768px) {
    .modal-content {
        margin: 5% auto;
        width: 95%;
        max-height: 90vh;
        border-radius: 20px;
    }
    
    .modal-header {
        padding: 20px 25px;
        border-radius: 20px 20px 0 0;
    }
    
    .modal-header h2 {
        font-size: 1.4rem;
    }
    
    .modal-body {
        padding: 25px;
    }
    
    .service-detail {
        grid-template-columns: 1fr;
        gap: 25px;
        text-align: center;
    }
    
    .service-icon-large {
        width: 120px;
        height: 120px;
        margin: 0 auto;
    }
    
    .service-icon-large i {
        font-size: 3rem;
    }
    
    .service-info h3 {
        font-size: 1.6rem;
    }
    
    .service-description {
        font-size: 1.1rem;
        padding: 15px;
    }
    
    .service-features,
    .service-benefits,
    .service-pricing {
        padding: 20px;
    }
    
    .modal-footer {
        flex-direction: column;
        padding: 20px 25px;
        gap: 12px;
    }
    
    .modal-footer .btn {
        width: 100%;
        margin: 0;
        padding: 12px 20px;
    }
}

@media (max-width: 480px) {
    .modal-content {
        margin: 3% auto;
        width: 98%;
        max-height: 94vh;
    }
    
    .modal-header {
        padding: 15px 20px;
    }
    
    .modal-body {
        padding: 20px;
    }
    
    .service-icon-large {
        width: 100px;
        height: 100px;
    }
    
    .service-icon-large i {
        font-size: 2.5rem;
    }
    
    .service-info h3 {
        font-size: 1.4rem;
    }
    
    .service-description {
        font-size: 1rem;
        padding: 15px;
    }
    
    .service-features,
    .service-benefits,
    .service-pricing {
        padding: 15px;
    }
    
    .modal-footer {
        padding: 15px 20px;
    }
}