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

:root {
    --black: #0a0a0a;
    --white: #ffffff;
    --gray-100: #f5f5f5;
    --gray-200: #e5e5e5;
    --gray-400: #a3a3a3;
    --gray-600: #525252;
    --gray-800: #262626;
    --gray-900: #171717;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: var(--white);
    color: var(--black);
    line-height: 1.6;
    overflow-x: hidden;
}

/* NAV */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 48px;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--gray-200);
}

.nav-logo img {
    height: 28px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav-links a {
    text-decoration: none;
    color: var(--black);
    font-size: 13px;
    font-weight: 400;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    transition: opacity 0.3s;
}

.nav-links a:hover {
    opacity: 0.5;
}

.nav-cta {
    padding: 10px 24px;
    border: 1px solid var(--black);
    transition: background 0.3s, color 0.3s;
}

.nav-cta:hover {
    background: var(--black) !important;
    color: var(--white) !important;
    opacity: 1 !important;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 24px;
    height: 1.5px;
    background: var(--black);
    transition: transform 0.3s;
}

/* HERO */
.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 100vh;
    padding-top: 80px;
}

.hero-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 80px 48px 80px 48px;
}

.hero h1 {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: clamp(36px, 4.5vw, 64px);
    font-weight: 400;
    line-height: 1.15;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.hero-sub {
    font-size: 16px;
    color: var(--gray-600);
    max-width: 440px;
    margin-bottom: 40px;
    line-height: 1.7;
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    background: var(--black);
    color: var(--white);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    transition: opacity 0.3s;
    align-self: flex-start;
}

.btn:hover {
    opacity: 0.8;
}

.hero-image {
    overflow: hidden;
}

.hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* SECTIONS */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-header h2 {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: clamp(32px, 3.5vw, 48px);
    font-weight: 400;
    margin-bottom: 12px;
}

.section-header p {
    color: var(--gray-600);
    font-size: 15px;
}

/* SERVICES */
.services {
    padding: 120px 48px;
    background: var(--gray-100);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
}

.service-card {
    padding: 40px 32px;
    background: var(--white);
    transition: transform 0.3s;
}

.service-card:hover {
    transform: translateY(-4px);
}

.service-number {
    font-size: 12px;
    color: var(--gray-400);
    letter-spacing: 0.1em;
    margin-bottom: 20px;
}

.service-card h3 {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 22px;
    font-weight: 400;
    margin-bottom: 12px;
}

.service-card p {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.7;
}

/* PORTFOLIO */
.portfolio {
    padding: 120px 48px;
}

.portfolio-filter {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 48px;
}

.filter-btn {
    padding: 8px 20px;
    background: none;
    border: 1px solid var(--gray-200);
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 13px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    cursor: pointer;
    transition: all 0.3s;
    color: var(--gray-600);
}

.filter-btn.active,
.filter-btn:hover {
    background: var(--black);
    color: var(--white);
    border-color: var(--black);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 4px;
    max-width: 1400px;
    margin: 0 auto;
}

.portfolio-item {
    position: relative;
    aspect-ratio: 3/4;
    overflow: hidden;
    cursor: pointer;
}

.portfolio-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.portfolio-item:hover img {
    transform: scale(1.05);
}

.portfolio-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 24px 16px;
    background: linear-gradient(transparent, rgba(0,0,0,0.7));
    opacity: 0;
    transition: opacity 0.3s;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.portfolio-item:hover .portfolio-overlay {
    opacity: 1;
}

.portfolio-category {
    color: var(--white);
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.03em;
}

.portfolio-label {
    color: rgba(255,255,255,0.6);
    font-size: 11px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.portfolio-item.hidden {
    display: none;
}

/* PROCESS */
.process {
    padding: 120px 48px;
    background: var(--black);
    color: var(--white);
}

.process .section-header h2 {
    color: var(--white);
}

.process .section-header p {
    color: var(--gray-400);
}

.process-steps {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 0;
    max-width: 1000px;
    margin: 0 auto;
}

.process-step {
    flex: 1;
    text-align: center;
    padding: 0 32px;
}

.step-number {
    font-size: 48px;
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-weight: 400;
    color: var(--gray-600);
    margin-bottom: 20px;
}

.process-step h3 {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 20px;
    font-weight: 400;
    margin-bottom: 12px;
}

.process-step p {
    font-size: 14px;
    color: var(--gray-400);
    line-height: 1.7;
}

.process-line {
    width: 1px;
    height: 120px;
    background: var(--gray-800);
    flex-shrink: 0;
    margin-top: 24px;
}

/* WHY */
.why {
    padding: 120px 48px;
}

.why-content {
    max-width: 1000px;
    margin: 0 auto;
}

.why h2 {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: clamp(32px, 3.5vw, 48px);
    font-weight: 400;
    margin-bottom: 48px;
    text-align: center;
}

.why-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 48px 64px;
}

.why-item h3 {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 28px;
    font-weight: 400;
    margin-bottom: 8px;
}

.why-item p {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.7;
}

/* CONTACT */
.contact {
    padding: 120px 48px;
    background: var(--gray-100);
    text-align: center;
}

.contact h2 {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: clamp(32px, 3.5vw, 48px);
    font-weight: 400;
    margin-bottom: 12px;
}

.contact p {
    color: var(--gray-600);
    font-size: 15px;
    margin-bottom: 32px;
}

.contact .btn {
    font-size: 14px;
}

/* FOOTER */
.footer {
    padding: 40px 48px;
    border-top: 1px solid var(--gray-200);
}

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

.footer-logo {
    height: 20px;
}

.footer p {
    font-size: 12px;
    color: var(--gray-400);
}

/* LIGHTBOX */
.lightbox {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 200;
    background: rgba(0,0,0,0.95);
    align-items: center;
    justify-content: center;
}

.lightbox.active {
    display: flex;
}

.lightbox-img {
    max-width: 90vw;
    max-height: 90vh;
    object-fit: contain;
}

.lightbox-close,
.lightbox-prev,
.lightbox-next {
    position: absolute;
    background: none;
    border: none;
    color: var(--white);
    font-size: 32px;
    cursor: pointer;
    padding: 16px;
    transition: opacity 0.3s;
    z-index: 201;
}

.lightbox-close:hover,
.lightbox-prev:hover,
.lightbox-next:hover {
    opacity: 0.6;
}

.lightbox-close {
    top: 20px;
    right: 20px;
    font-size: 40px;
}

.lightbox-prev {
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 48px;
}

.lightbox-next {
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 48px;
}

/* MOBILE */
@media (max-width: 900px) {
    .nav {
        padding: 16px 24px;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--white);
        padding: 24px;
        gap: 20px;
        border-bottom: 1px solid var(--gray-200);
    }

    .nav-links.open {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .hero {
        grid-template-columns: 1fr;
        min-height: auto;
    }

    .hero-content {
        padding: 120px 24px 48px;
    }

    .hero-image {
        height: 60vh;
    }

    .services {
        padding: 80px 24px;
    }

    .services-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .portfolio {
        padding: 80px 16px;
    }

    .portfolio-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 3px;
    }

    .portfolio-filter {
        flex-wrap: wrap;
    }

    .process {
        padding: 80px 24px;
    }

    .process-steps {
        flex-direction: column;
        gap: 40px;
    }

    .process-line {
        width: 60px;
        height: 1px;
        align-self: center;
    }

    .why {
        padding: 80px 24px;
    }

    .why-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .contact {
        padding: 80px 24px;
    }

    .footer {
        padding: 24px;
    }

    .footer-content {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
}

@media (max-width: 600px) {
    .portfolio-grid {
        grid-template-columns: 1fr;
    }
}

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

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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