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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #111827;
    background-color: #FFFFFF;
}

/* CSS Variables for Design System */
:root {
    --primary-500: #fe6100;
    --primary-700: #7a00c9;
    --primary-50: #f8f1fc;
    --neutral-900: #111827;
    --neutral-600: #4B5563;
    --neutral-200: #f0e3f9;
    --neutral-100: #f9f1fe;
    --neutral-0: #FFFFFF;
    --success-500: #10B981;
    --error-500: #EF4444;
    --shadow-color: rgba(0, 87, 183, 0.1);
    
    /* Spacing (8px grid) */
    --xs: 8px;
    --sm: 16px;
    --md: 24px;
    --lg: 32px;
    --xl: 48px;
    --xxl: 64px;
    --xxxl: 96px;
    
    /* Typography */
    --font-xs: 14px;
    --font-sm: 16px;
    --font-base: 18px;
    --font-lg: 20px;
    --font-xl: 24px;
    --font-2xl: 40px;
    --font-3xl: 56px;
    
    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    
    /* Transitions */
    --transition: all 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 300ms ease-in-out;
}

/* Container */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--md);
}

/* Typography */
h1 {
    font-size: var(--font-3xl);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--neutral-900);
}

h2 {
    font-size: var(--font-2xl);
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: -0.02em;
    color: var(--neutral-900);
}

h3 {
    font-size: var(--font-xl);
    font-weight: 600;
    line-height: 1.4;
    letter-spacing: -0.01em;
    color: var(--neutral-900);
}

h4 {
    font-size: 20px;
    font-weight: 600;
    line-height: 1.4;
    color: var(--neutral-900);
}

p {
    font-size: var(--font-base);
    font-weight: 400;
    line-height: 1.7;
    color: var(--neutral-600);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px var(--md);
    font-size: var(--font-sm);
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    min-height: 48px;
}

.btn-primary {
    background-color: var(--primary-500);
    color: var(--neutral-0);
}

.btn-primary:hover {
    background-color: var(--primary-700);
    transform: translateY(-2px);
}

.btn-primary:active {
    transform: translateY(0) scale(0.98);
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-500);
    border: 2px solid var(--primary-500);
}

.btn-secondary:hover {
    background-color: var(--primary-500);
    color: var(--neutral-0);
    transform: translateY(-2px);
}

.btn-large {
    padding: 16px var(--lg);
    font-size: 18px;
    min-height: 56px;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--neutral-0);
    box-shadow: 0 2px 12px var(--shadow-color);
    z-index: 1000;
    transition: var(--transition);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--md);
    height: 80px;
}

.nav-brand .logo {
    display: flex;
    align-items: center;
    gap: var(--sm);
    text-decoration: none;
}

.logo-icon {
    font-size: 32px;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-500);
}

.nav-menu {
    display: flex;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: var(--lg);
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--neutral-600);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: var(--primary-500);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-500);
    transition: var(--transition);
}

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

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

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--neutral-900);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    padding: 140px 0 var(--xxxl);
    background: linear-gradient(135deg, var(--neutral-0) 0%, var(--primary-50) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--md);
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    margin-bottom: var(--md);
    color: var(--neutral-900);
}

.hero-subtitle {
    font-size: var(--font-lg);
    color: var(--neutral-600);
    margin-bottom: var(--xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    gap: var(--sm);
    justify-content: center;
    margin-bottom: var(--xxl);
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: var(--xxl);
    justify-content: center;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-500);
    margin-bottom: var(--xs);
}

.stat-label {
    font-size: var(--font-sm);
    color: var(--neutral-600);
    font-weight: 500;
}

/* Section Styles */
section {
    padding: var(--xxxl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--xxxl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.section-title {
    margin-bottom: var(--sm);
}

.section-subtitle {
    font-size: var(--font-lg);
    color: var(--neutral-600);
}

/* About Section */
.about {
    background-color: var(--neutral-100);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--lg);
}

.about-card {
    background-color: var(--neutral-0);
    padding: var(--lg);
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: 0 4px 12px var(--shadow-color);
    transition: var(--transition);
}

.about-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--shadow-color);
}

.about-icon {
    font-size: 48px;
    margin-bottom: var(--sm);
}

.about-title {
    margin-bottom: var(--sm);
}

.about-description {
    font-size: var(--font-base);
}

/* Services Section */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--lg);
}

.service-category {
    margin-bottom: var(--xxxl);
}

.service-category-title {
    text-align: center;
    margin-bottom: var(--xl);
    color: var(--primary-500);
    font-size: 28px;
}

.service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--sm);
}

.service-item {
    display: flex;
    align-items: center;
    padding: var(--sm) var(--md);
    background-color: var(--neutral-0);
    border-radius: var(--radius-sm);
    box-shadow: 0 2px 8px var(--shadow-color);
    transition: var(--transition);
    cursor: pointer;
}

.service-item:hover {
    background-color: var(--primary-50);
    transform: translateY(-2px);
}

.service-item:hover .service-text {
    color: var(--primary-700);
    text-decoration: underline;
}

.service-icon {
    font-size: 24px;
    margin-right: var(--sm);
    flex-shrink: 0;
}

.service-text {
    font-weight: 500;
    color: var(--neutral-900);
    transition: var(--transition);
}

/* Testimonials Section */
.testimonials {
    background-color: var(--neutral-100);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--lg);
}

.testimonial-card {
    background-color: var(--neutral-0);
    padding: var(--lg);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 12px var(--shadow-color);
    transition: var(--transition);
}

.testimonial-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--shadow-color);
}

.testimonial-content {
    margin-bottom: var(--lg);
}

.testimonial-text {
    font-style: italic;
    font-size: var(--font-base);
    line-height: 1.6;
}

.testimonial-author {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.author-name {
    font-weight: 600;
    margin-bottom: 4px;
}

.author-title {
    font-size: var(--font-sm);
    color: var(--neutral-600);
    margin: 0;
}

.testimonial-rating {
    display: flex;
    gap: 2px;
}

.star {
    color: #FCD34D;
    font-size: 18px;
}

/* FAQ Section */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--neutral-200);
}

.faq-question {
    width: 100%;
    padding: var(--md) 0;
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--font-lg);
    font-weight: 600;
    color: var(--neutral-900);
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--primary-500);
}

.faq-question[aria-expanded="true"] {
    color: var(--primary-500);
}

.faq-icon {
    font-size: 24px;
    font-weight: 400;
    transition: var(--transition);
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 0 var(--md) 0;
    max-height: 0;
    overflow: hidden;
    transition: var(--transition-slow);
}

.faq-answer.active {
    max-height: 200px;
    padding: 0 0 var(--md) 0;
}

/* Contact Section */
.contact {
    background-color: var(--neutral-100);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--xxxl);
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--lg);
}

.contact-item h3 {
    margin-bottom: var(--sm);
    color: var(--primary-500);
}

.contact-item p {
    margin-bottom: var(--xs);
}

.contact-form {
    background-color: var(--neutral-0);
    padding: var(--lg);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 12px var(--shadow-color);
}

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

.form-group label {
    display: block;
    margin-bottom: var(--xs);
    font-weight: 500;
    color: var(--neutral-900);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px var(--sm);
    border: 1px solid var(--neutral-200);
    border-radius: var(--radius-sm);
    font-size: var(--font-base);
    font-family: inherit;
    transition: var(--transition);
    background-color: var(--neutral-0);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border: 2px solid var(--primary-500);
    box-shadow: 0 0 0 3px rgba(0, 87, 183, 0.15);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.error-message {
    display: block;
    color: var(--error-500);
    font-size: var(--font-xs);
    margin-top: var(--xs);
    opacity: 0;
    transition: var(--transition);
}

.error-message.show {
    opacity: 1;
}

.form-group.error input,
.form-group.error select,
.form-group.error textarea {
    border-color: var(--error-500);
}

/* Footer */
.footer {
    background-color: var(--neutral-900);
    color: var(--neutral-0);
    padding: var(--xxxl) 0 var(--lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--xxl);
    margin-bottom: var(--xxl);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--sm);
    margin-bottom: var(--md);
}

.footer-logo .logo-text {
    color: var(--neutral-0);
    font-size: 24px;
}

.footer-description {
    color: #9CA3AF;
    margin-bottom: var(--md);
    line-height: 1.6;
}

.footer-social {
    display: flex;
    gap: var(--sm);
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--primary-500);
    border-radius: 50%;
    text-decoration: none;
    transition: var(--transition);
    font-size: 18px;
}

.footer-social a:hover {
    background-color: var(--primary-700);
    transform: translateY(-2px);
}

.footer-title {
    color: var(--neutral-0);
    margin-bottom: var(--md);
    font-size: 18px;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--sm);
}

.footer-links a {
    color: #9CA3AF;
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-500);
}

.footer-bottom {
    border-top: 1px solid #374151;
    padding-top: var(--lg);
    text-align: center;
    color: #9CA3AF;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--neutral-0);
    padding: var(--xxl);
    border-radius: var(--radius-md);
    text-align: center;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.modal-icon {
    font-size: 64px;
    margin-bottom: var(--md);
}

.modal-title {
    margin-bottom: var(--sm);
    color: var(--success-500);
}

.modal-message {
    margin-bottom: var(--lg);
    color: var(--neutral-600);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--xl);
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: var(--lg);
    }
}

@media (max-width: 768px) {
    :root {
        --font-3xl: 40px;
        --font-2xl: 32px;
        --font-xl: 20px;
        --xxxl: 64px;
        --xxl: 48px;
    }
    
    .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        background-color: var(--neutral-0);
        box-shadow: 0 4px 12px var(--shadow-color);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-list {
        flex-direction: column;
        padding: var(--md);
        gap: var(--md);
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-stats {
        gap: var(--lg);
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .service-grid {
        grid-template-columns: 1fr;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--sm);
    }
    
    .nav-container {
        padding: 0 var(--sm);
    }
    
    .hero {
        padding: 120px 0 var(--xl);
    }
    
    .service-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-form {
        padding: var(--md);
    }
    
    .modal-content {
        padding: var(--lg);
        margin: var(--sm);
    }
}

/* Animations and Loading States */
@media (prefers-reduced-motion: no-preference) {
    .about-card,
    .testimonial-card,
    .service-item {
        animation: fadeInUp 0.6s ease-out;
    }
    
    .service-item:nth-child(1) { animation-delay: 0.1s; }
    .service-item:nth-child(2) { animation-delay: 0.2s; }
    .service-item:nth-child(3) { animation-delay: 0.3s; }
    .service-item:nth-child(4) { animation-delay: 0.4s; }
    .service-item:nth-child(5) { animation-delay: 0.5s; }
    .service-item:nth-child(6) { animation-delay: 0.6s; }
    .service-item:nth-child(7) { animation-delay: 0.7s; }
    .service-item:nth-child(8) { animation-delay: 0.8s; }
}

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

/* Utility Classes */
.text-center { text-align: center; }
.text-primary { color: var(--primary-500); }
.text-success { color: var(--success-500); }
.text-error { color: var(--error-500); }
.mb-sm { margin-bottom: var(--sm); }
.mb-md { margin-bottom: var(--md); }
.mb-lg { margin-bottom: var(--lg); }
.mt-sm { margin-top: var(--sm); }
.mt-md { margin-top: var(--md); }
.mt-lg { margin-top: var(--lg); }