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

/* Light Mode (Default) */
:root {
    --primary-color: #000000;
    --primary-dark: #1A1A1A;
    --secondary-color: #333333;
    --text-primary: #000000;
    --text-secondary: #4A4A4A;
    --text-light: #6B6B6B;
    --background: #FFFFFF;
    --background-light: #F5F5F5;
    --background-gray: #E8E8E8;
    --border-color: #D1D1D1;
    --success: #000000;
    --accent: #FFFFFF;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
    :root {
        --primary-color: #FFFFFF;
        --primary-dark: #E8E8E8;
        --secondary-color: #CCCCCC;
        --text-primary: #FFFFFF;
        --text-secondary: #B8B8B8;
        --text-light: #999999;
        --background: #000000;
        --background-light: #1A1A1A;
        --background-gray: #2A2A2A;
        --border-color: #333333;
        --success: #FFFFFF;
        --accent: #000000;
    }
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--background);
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-primary);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

/* Buttons */
.btn-primary,
.btn-secondary {
    display: inline-block;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 500;
    border-radius: 4px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition);
    text-align: center;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--background);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

@media (prefers-color-scheme: dark) {
    .btn-primary:hover {
        box-shadow: 0 4px 12px rgba(255, 255, 255, 0.3);
    }
}

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

.btn-secondary:hover {
    background: var(--primary-color);
    color: var(--background);
}

.btn-large {
    padding: 1.125rem 2.5rem;
    font-size: 1.125rem;
}

/* Navigation */
.navbar {
    background: var(--background);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

@media (prefers-color-scheme: light) {
    .navbar {
        background: rgba(255, 255, 255, 0.95);
    }
}

@media (prefers-color-scheme: dark) {
    .navbar {
        background: rgba(0, 0, 0, 0.95);
    }
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem var(--spacing-md);
}

.nav-brand h2 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

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

.nav-menu a {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 0;
    position: relative;
}

.nav-menu a:not(.btn-primary):hover {
    color: var(--primary-color);
}

.nav-menu a:not(.btn-primary)::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.nav-menu a:not(.btn-primary):hover::after {
    width: 100%;
}

.nav-menu .btn-primary {
    padding: 0.625rem 1.5rem;
}

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

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    background: var(--background-light);
    padding: var(--spacing-xl) 0;
    min-height: 80vh;
    display: flex;
    align-items: center;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.hero-title {
    margin-bottom: var(--spacing-md);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.5rem);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* Stats Section */
.stats {
    padding: var(--spacing-lg) 0;
    background: var(--background);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    text-align: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Section Styles */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section-title {
    margin-bottom: var(--spacing-sm);
    font-weight: 700;
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

/* Services Section */
.services {
    padding: var(--spacing-xl) 0;
    background: var(--background-light);
}

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

.service-card {
    background: var(--background);
    padding: var(--spacing-lg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color);
}

@media (prefers-color-scheme: dark) {
    .service-card:hover {
        box-shadow: 0 12px 24px rgba(255, 255, 255, 0.1);
    }
}

.service-icon {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.service-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.service-description {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Expertise Section */
.expertise {
    padding: var(--spacing-xl) 0;
    background: var(--background);
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.expertise-item {
    padding: var(--spacing-md);
    border-left: 4px solid var(--primary-color);
    background: var(--background-light);
    transition: var(--transition);
}

.expertise-item:hover {
    background: var(--background-gray);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transform: translateX(8px);
}

@media (prefers-color-scheme: dark) {
    .expertise-item:hover {
        box-shadow: 0 4px 12px rgba(255, 255, 255, 0.08);
    }
}

.expertise-item h4 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.expertise-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Case Studies Section */
.case-studies {
    padding: var(--spacing-xl) 0;
    background: var(--background-light);
}

.case-studies-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: var(--spacing-md);
}

.case-study-card {
    background: var(--background);
    padding: var(--spacing-lg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.case-study-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
}

@media (prefers-color-scheme: dark) {
    .case-study-card:hover {
        box-shadow: 0 12px 32px rgba(255, 255, 255, 0.12);
    }
}

.case-study-tag {
    display: inline-block;
    background: var(--background-light);
    color: var(--primary-color);
    padding: 0.375rem 0.875rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    width: fit-content;
    border: 1px solid var(--border-color);
}

.case-study-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.case-study-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
    flex-grow: 1;
}

.case-study-metrics {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.metric {
    display: flex;
    flex-direction: column;
}

.metric-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
}

.metric-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.case-study-link {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1rem;
}

.case-study-link:hover {
    color: var(--primary-dark);
}

/* Insights Section */
.insights {
    padding: var(--spacing-xl) 0;
    background: var(--background);
}

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

.insight-card {
    background: var(--background-light);
    padding: var(--spacing-lg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.insight-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.08);
    background: var(--background-gray);
}

@media (prefers-color-scheme: dark) {
    .insight-card:hover {
        box-shadow: 0 8px 16px rgba(255, 255, 255, 0.08);
    }
}

.insight-meta {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
    font-size: 0.875rem;
}

.insight-category {
    color: var(--primary-color);
    font-weight: 600;
}

.insight-date {
    color: var(--text-light);
}

.insight-title {
    font-size: 1.375rem;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.insight-excerpt {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.insight-link {
    color: var(--primary-color);
    font-weight: 600;
}

.insight-link:hover {
    color: var(--primary-dark);
}

/* CTA Section */
.cta-section {
    padding: var(--spacing-xl) 0;
    background: var(--primary-color);
    color: var(--background);
    text-align: center;
}

.cta-title {
    color: var(--background);
    margin-bottom: var(--spacing-sm);
}

.cta-subtitle {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
    color: var(--background);
}

.cta-section .btn-primary {
    background: var(--background);
    color: var(--primary-color);
    border-color: var(--background);
}

.cta-section .btn-primary:hover {
    background: var(--background-light);
    transform: translateY(-4px);
}

@media (prefers-color-scheme: light) {
    .cta-section .btn-primary:hover {
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    }
}

@media (prefers-color-scheme: dark) {
    .cta-section .btn-primary:hover {
        box-shadow: 0 8px 24px rgba(255, 255, 255, 0.2);
    }
}

/* Contact Section */
.contact {
    padding: var(--spacing-xl) 0;
    background: var(--background-light);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

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

.contact-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    font-size: 1.125rem;
    line-height: 1.7;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-detail-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.contact-detail-item svg {
    color: var(--primary-color);
    flex-shrink: 0;
    margin-top: 4px;
}

.contact-detail-item h4 {
    font-size: 1.125rem;
    margin-bottom: 0.25rem;
}

.contact-detail-item p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Contact Form */
.contact-form {
    background: var(--background);
    padding: var(--spacing-lg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

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

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.875rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
    background: var(--background);
    color: var(--text-primary);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

@media (prefers-color-scheme: light) {
    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
        box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.1);
    }
}

@media (prefers-color-scheme: dark) {
    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
        box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.1);
    }
}

.form-group textarea {
    resize: vertical;
}

.contact-form .btn-primary {
    width: 100%;
}

/* Footer */
.footer {
    background: var(--primary-color);
    color: var(--background);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

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

.footer-section h3 {
    color: var(--background);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.footer-section h4 {
    color: var(--background);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.footer-section p {
    color: var(--background);
    opacity: 0.8;
    line-height: 1.7;
}

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

.footer-section ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-section ul li a {
    color: var(--background);
    opacity: 0.8;
    transition: var(--transition);
}

.footer-section ul li a:hover {
    opacity: 1;
    padding-left: 4px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    color: var(--background);
    opacity: 0.7;
}

.footer-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-links a {
    color: var(--background);
    opacity: 0.7;
    transition: var(--transition);
}

.footer-links a:hover {
    opacity: 1;
}

/* Responsive Design */
@media (max-width: 968px) {
    .contact-wrapper {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--background);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        padding: var(--spacing-md) 0;
        border-bottom: 1px solid var(--border-color);
    }

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

    @media (prefers-color-scheme: light) {
        .nav-menu {
            box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        }
    }

    @media (prefers-color-scheme: dark) {
        .nav-menu {
            box-shadow: 0 10px 27px rgba(255, 255, 255, 0.05);
        }
    }

    .hamburger {
        display: flex;
    }

    .hero {
        padding: var(--spacing-lg) 0;
    }

    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-cta a {
        width: 100%;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .services-grid,
    .case-studies-grid,
    .insights-grid {
        grid-template-columns: 1fr;
    }

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

    .footer-content {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

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

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

.hero-content,
.service-card,
.case-study-card,
.insight-card {
    animation: fadeInUp 0.6s ease-out;
}

/* Loading Animation */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}