:root {
    --bg-dark: #121212;
    --bg-card: #1e1e1e;
    --bg-steel: #2c3e50;
    /* Cooler tone */
    --text-main: #f0f0f0;
    --text-muted: #a0a0a0;
    --accent: #d4af37;
    /* Muted gold/metallic for premium feel, or maybe a safer concrete grey/blue? User said "Graphit/Steel" */
    --accent-steel: #7f8c8d;
    --border-color: #333;

    --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica", "Arial", sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;

    --transition-fast: 0.3s ease;
    --transition-slow: 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* Preloader */
/* Preloader */
.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #0b0b0b;
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background 0.5s ease-out;
    /* Fade out bg only */
}

.preloader.fade-out {
    background: transparent;
    pointer-events: none;
}

.preloader-content {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.preloader-text {
    font-family: monospace;
    font-size: 1.5rem;
    color: var(--text-main);
    letter-spacing: 0.1em;
    position: absolute;
}

.preloader-logo-wrapper {
    position: absolute;
    width: 120px;
    height: 120px;
    opacity: 0;
    transform: scale(0.8);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.preloader-logo-wrapper.visible {
    opacity: 1;
    transform: scale(1);
}

.preloader-logo {
    width: 100%;
    height: 100%;
    overflow: visible;
    /* Allow effects outside */
}

/* Header Logo Initial State */
.main-nav .logo {
    opacity: 0;
    /* Hidden initially */
    transition: opacity 0.3s ease;
}

.main-nav .logo.visible {
    opacity: 1;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

/* Utilities */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

.section-padding {
    padding: var(--spacing-xl) 0;
}

.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    border: 1px solid transparent;
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: 0.9rem;
}

.btn-primary {
    background-color: var(--text-main);
    color: var(--bg-dark);
    border-color: var(--text-main);
}

.btn-primary:hover {
    background-color: transparent;
    color: var(--text-main);
}

.btn-secondary {
    background-color: transparent;
    border-color: var(--text-muted);
    color: var(--text-main);
}

.btn-secondary:hover {
    border-color: var(--text-main);
}

.btn-outline {
    border: 1px solid var(--text-main);
    color: var(--text-main);
    background: transparent;
}

.btn-outline:hover {
    background: var(--text-main);
    color: var(--bg-dark);
}

.full-width {
    width: 100%;
    text-align: center;
}

/* Navigation */
.main-nav {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding: var(--spacing-md) 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
}

.main-nav .logo {
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

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

.main-nav .nav-links a {
    font-size: 0.9rem;
    letter-spacing: 0.05em;
    color: var(--text-main);
    opacity: 0.8;
}

.main-nav .nav-links a:hover {
    opacity: 1;
}

.main-nav .nav-btn {
    border: 1px solid var(--text-main);
    padding: 0.5rem 1.2rem;
    opacity: 1 !important;
}

/* Hero */
.hero-section {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
}

.video-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.video-background video,
.video-background img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.6;
    /* Dimmed */
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    background: linear-gradient(to bottom, rgba(18, 18, 18, 0.3), var(--bg-dark));
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero-content h1 {
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.subline {
    font-size: clamp(1.2rem, 3vw, 1.8rem);
    color: var(--text-muted);
    font-weight: 300;
    margin-bottom: var(--spacing-md);
}

.usps {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    color: var(--text-muted);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-lg);
}

.usps .separator {
    color: var(--accent-steel);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
}

/* Sections Common */
.section-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
    font-weight: 300;
    border-left: 4px solid var(--text-main);
    padding-left: var(--spacing-sm);
}

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

.service-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: var(--spacing-md);
    transition: var(--transition-fast);
}

.service-card:hover {
    border-color: var(--text-main);
    transform: translateY(-5px);
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-main);
}

.service-card ul li {
    margin-bottom: 0.5rem;
    color: var(--text-muted);
    position: relative;
    padding-left: 1.5rem;
}

.service-card ul li::before {
    content: "—";
    /* specific typographic dash */
    position: absolute;
    left: 0;
    color: var(--accent-steel);
}

/* Why Section */
.why-section {
    background-color: #161616;
}

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

.proof-item {
    text-align: left;
}

.proof-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: var(--spacing-sm);
    opacity: 0.8;
}

.proof-item h4 {
    margin-bottom: var(--spacing-xs);
    font-size: 1.2rem;
}

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

/* Tech Section */
.tech-sheet {
    border: 1px solid var(--border-color);
    background: #1a1a1a;
}

.tech-header {
    background: #252525;
    padding: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.tech-header h2 {
    font-size: 1.2rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin: 0;
}

.dataset-id {
    font-family: monospace;
    color: var(--accent-steel);
    font-size: 0.8rem;
}

.tech-body {
    padding: var(--spacing-md);
}

.tech-row {
    display: flex;
    border-bottom: 1px solid #333;
    padding: var(--spacing-sm) 0;
}

.tech-row:last-child {
    border-bottom: none;
}

.tech-row .label {
    width: 40%;
    color: var(--text-muted);
    font-family: monospace;
    text-transform: uppercase;
    font-size: 0.85rem;
}

.tech-row .value {
    width: 60%;
    font-weight: 500;
}

/* Team */
.team-wrapper {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    align-items: center;
}

.team-image {
    flex: 1;
    min-width: 300px;
}

.team-image img {
    width: 100%;
    display: block;
    filter: grayscale(100%);
    transition: var(--transition-fast);
}

.team-image img:hover {
    filter: grayscale(0%);
}

.team-content {
    flex: 1;
    min-width: 300px;
}

.team-content blockquote {
    font-size: 1.5rem;
    font-weight: 300;
    margin-bottom: var(--spacing-md);
    position: relative;
    padding-left: 2rem;
    border-left: 2px solid var(--accent-steel);
}

.team-role {
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.8rem;
}

/* Projects */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1px;
    /* very thin gap */
    background: var(--border-color);
    border: 1px solid var(--border-color);
}

.project-card {
    position: relative;
    aspect-ratio: 4/3;
    overflow: hidden;
    background: var(--bg-dark);
}

.project-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.project-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: var(--spacing-md);
    background: linear-gradient(to top, rgba(0, 0, 0, 0.9), transparent);
    transform: translateY(100%);
    transition: var(--transition-fast);
}

.project-card:hover .project-overlay {
    transform: translateY(0);
}

.project-card:hover img {
    transform: scale(1.05);
}

.project-overlay h3 {
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
    color: #fff;
}

.project-overlay p {
    font-size: 0.85rem;
    color: #ccc;
}

.projects-more {
    margin-top: var(--spacing-lg);
    text-align: center;
}

/* Contact */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.contact-info h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.contact-info p {
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
}

.contact-details {
    margin: var(--spacing-md) 0;
}

.cd-item {
    margin-bottom: var(--spacing-sm);
}

.cd-item strong {
    display: block;
    color: var(--text-main);
    font-size: 0.9rem;
}

.cd-item a {
    color: var(--text-muted);
    font-size: 1.1rem;
}

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

.contact-form label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    text-transform: uppercase;
    color: var(--text-muted);
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 1rem;
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition-fast);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--text-main);
    background: #252525;
}

.error-msg {
    color: #e74c3c;
    font-size: 0.8rem;
    display: none;
    margin-top: 0.3rem;
}

.contact-form.submitted .error-msg {
    display: block;
}

/* But JS handles display manually too */

.form-status {
    margin-top: 1rem;
    font-size: 0.9rem;
    min-height: 1.5em;
}

.form-status.success {
    color: #2ecc71;
}

/* Sticky CTA */
.sticky-cta {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--text-main);
    color: var(--bg-dark);
    padding: 0.8rem 1.2rem;
    border-radius: 50px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    z-index: 999;
    transform: translateY(100px);
    /* Hidden initially */
    opacity: 0;
    transition: var(--transition-fast);
}

.sticky-cta.visible {
    transform: translateY(0);
    opacity: 1;
}

.sticky-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

/* Footer */
.main-footer {
    background: #000;
    padding-top: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.footer-grid {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.footer-col h4 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-muted);
    font-size: 0.9rem;
    text-transform: uppercase;
}

.footer-col ul li a {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-col ul li a:hover {
    color: var(--text-main);
}

.recruiting-tag {
    background: #1a1a1a;
    padding: 1rem;
    border: 1px dashed #333;
    display: inline-block;
}

.recruiting-tag span {
    display: block;
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-bottom: 0.3rem;
}

.link-highlight {
    color: var(--text-main);
    font-weight: 600;
}

.footer-bottom {
    text-align: center;
    color: #444;
    font-size: 0.8rem;
    border-top: 1px solid #1a1a1a;
    padding-top: var(--spacing-md);
}

/* Animations */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 {
    transition-delay: 0.1s;
}

.delay-2 {
    transition-delay: 0.2s;
}

.delay-3 {
    transition-delay: 0.3s;
}

/* Responsive */
@media (max-width: 768px) {
    .main-nav {
        padding: var(--spacing-sm) 5%;
    }

    .main-nav .nav-links {
        display: none;
        /* Mobile menu not requested, simplified */
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .contact-wrapper {
        grid-template-columns: 1fr;
    }

    .tech-row .label {
        font-size: 0.75rem;
    }

    .projects-grid {
        grid-template-columns: repeat(auto-fill, minmax(100%, 1fr));
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
        scroll-behavior: auto !important;
    }

    .fade-up {
        opacity: 1;
        transform: none;
    }

    .sticky-cta {
        transition: opacity 0.3s;
        /* Just fade */
    }
}