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

:root {
    --color-text: #1a1a1a;
    --color-text-light: #4a4a4a;
    --color-background: #ffffff;
    --color-background-alt: #f8f8f8;
    --color-border: #e0e0e0;
    --color-accent: #2c2c2c;
    --color-link: #1a1a1a;
    --color-link-hover: #4a4a4a;

    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    --spacing-2xl: 4.5rem;

    --max-width: 1200px;
    --max-width-narrow: 800px;

    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: var(--spacing-md);
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    margin-bottom: var(--spacing-sm);
}

h4 {
    font-size: clamp(1.1rem, 2.5vw, 1.25rem);
    font-weight: 600;
}

p {
    margin-bottom: var(--spacing-sm);
}

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

a:hover {
    color: var(--color-link-hover);
}

strong {
    font-weight: 600;
}

em {
    font-style: italic;
}

ul {
    list-style: none;
}

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

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: #2A282A;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 1000;
    transition: var(--transition);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.logo {
    height: 40px;
    width: auto;
    display: block;
}

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

.nav a {
    font-size: 0.95rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    transition: var(--transition);
    color: #ffffff;
}

.nav a:hover {
    opacity: 0.7;
    color: #ffffff;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 2px;
    background-color: #ffffff;
    transition: var(--transition);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background-color: #2A282A;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-md);
    flex-direction: column;
    gap: var(--spacing-sm);
    z-index: 999;
}

.mobile-menu.active {
    display: flex;
}

.mobile-menu a {
    font-size: 1.1rem;
    font-weight: 500;
    padding: var(--spacing-sm) 0;
    color: #ffffff;
}

.mobile-menu a:hover {
    opacity: 0.7;
    color: #ffffff;
}

/* Hero Section */
.hero {
    padding: calc(80px + var(--spacing-2xl)) var(--spacing-md) var(--spacing-2xl);
    text-align: center;
}

.hero h1 {
    margin-bottom: var(--spacing-md);
}

.hero-intro {
    font-size: clamp(1.1rem, 2.5vw, 1.35rem);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.hero-description {
    font-size: clamp(1rem, 2vw, 1.125rem);
    color: var(--color-text-light);
    max-width: var(--max-width-narrow);
    margin: 0 auto var(--spacing-md);
}

/* How We Work */
.how-we-work {
    padding: var(--spacing-2xl) var(--spacing-md);
    background-color: var(--color-background-alt);
}

.how-we-work h2 {
    text-align: center;
}

.work-principles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.principle h4 {
    margin-bottom: var(--spacing-xs);
}

.principle p {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

/* Engagement Models */
.engagement-models {
    padding: var(--spacing-2xl) var(--spacing-md);
}

.engagement-models h2 {
    text-align: center;
}

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

.model {
    padding: var(--spacing-lg);
    background-color: var(--color-background-alt);
    border-radius: 8px;
    transition: var(--transition);
}

.model:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.model h3 {
    margin-bottom: var(--spacing-sm);
}

.model p {
    color: var(--color-text-light);
    margin-bottom: 0;
}

/* Services */
.services {
    padding: var(--spacing-2xl) var(--spacing-md);
    background-color: var(--color-background-alt);
}

.services h2 {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.service {
    max-width: var(--max-width-narrow);
    margin: 0 auto var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--color-border);
}

.service:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.service h3 {
    margin-bottom: var(--spacing-sm);
}

.service-intro {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    font-size: 1.05rem;
}

.service-label {
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-text);
}

.service ul {
    list-style: none;
    padding-left: 0;
}

.service ul li {
    padding-left: 1.5rem;
    position: relative;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-light);
}

.service ul li:before {
    content: "•";
    position: absolute;
    left: 0.5rem;
    font-weight: bold;
    color: var(--color-accent);
}

/* FAQs */
.faqs {
    padding: var(--spacing-2xl) var(--spacing-md);
}

.faqs h2 {
    text-align: center;
}

.faq-list {
    max-width: var(--max-width-narrow);
    margin: var(--spacing-lg) auto 0;
    list-style: none;
}

.faq-item {
    padding-bottom: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.faq-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.faq-item dt {
    font-weight: 600;
    font-size: 1.05rem;
    margin-bottom: var(--spacing-xs);
}

.faq-item dd {
    margin: 0;
    color: var(--color-text-light);
    line-height: 1.6;
}

/* About */
.about {
    padding: var(--spacing-2xl) var(--spacing-md);
    background-color: var(--color-background-alt);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    max-width: var(--max-width);
    margin: 0 auto;
}

.about-text h2 {
    margin-bottom: var(--spacing-md);
}

.about-text p {
    color: var(--color-text-light);
    font-size: 1.05rem;
}

.about-image {
    text-align: center;
}

.about-image img {
    max-width: 300px;
    width: 100%;
    height: auto;
    border-radius: 8px;
}

/* Contact */
.contact {
    padding: var(--spacing-2xl) var(--spacing-md);
    text-align: center;
}

.contact h2 {
    margin-bottom: var(--spacing-sm);
}

.contact > p {
    color: var(--color-text-light);
    font-size: 1.05rem;
    max-width: var(--max-width-narrow);
    margin: 0 auto var(--spacing-lg);
}

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

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

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

.btn-primary:hover {
    background-color: var(--color-text);
    border-color: var(--color-text);
    color: var(--color-background);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

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

.btn-secondary:hover {
    background-color: var(--color-accent);
    color: var(--color-background);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Footer */
.footer {
    padding: var(--spacing-xl) var(--spacing-md) var(--spacing-lg);
    background-color: #2A282A;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-logo {
    height: 32px;
    width: auto;
    display: block;
    object-fit: contain;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
    margin: 0;
}

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

.footer-links a {
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition);
}

.footer-links a:hover {
    color: #ffffff;
    opacity: 0.7;
}

/* Responsive Design */
@media (min-width: 768px) {
    .about-content {
        grid-template-columns: 2fr 1fr;
    }

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

@media (max-width: 767px) {
    :root {
        --spacing-md: 1.5rem;
        --spacing-lg: 2rem;
        --spacing-xl: 3rem;
        --spacing-2xl: 3rem;
    }

    .nav {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .hero {
        padding-top: calc(80px + var(--spacing-xl));
        padding-bottom: var(--spacing-xl);
    }

    .work-principles {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

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

    .contact-actions {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .contact-actions .btn {
        width: 100%;
        max-width: 300px;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

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

    .about-image {
        order: -1;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .header-content {
        padding: var(--spacing-xs) 0;
    }

    .logo {
        height: 32px;
    }
}

/* Smooth scrolling and animations */
@media (prefers-reduced-motion: no-preference) {
    .project,
    .model {
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .btn {
        transition: all 0.3s ease;
    }
}

/* Print styles */
@media print {
    .header,
    .mobile-menu,
    .contact,
    .footer {
        display: none;
    }

    .hero {
        padding-top: var(--spacing-md);
    }
}