/* ==========================================================================
   ASARH Studio - Design System & Component Styles
   ========================================================================== */

/* ---------- CSS Variables ---------- */
:root {
    /* Colors */
    --color-primary: #000000;
    --color-secondary: #FFFFFF;
    --color-accent: #1A1A1A;
    --color-muted: #888888;
    --color-light-bg: #F5F5F5;
    --color-overlay: rgba(0, 0, 0, 0.6);
    --color-overlay-light: rgba(0, 0, 0, 0.3);

    /* Typography */
    --font-heading: 'Playfair Display', Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-accent: 'Montserrat', sans-serif;

    /* Spacing (8px grid) */
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 32px;
    --space-xl: 48px;
    --space-2xl: 64px;
    --space-3xl: 96px;
    --space-4xl: 128px;
    --space-section: 120px;

    /* Layout */
    --max-width: 1200px;
    --max-width-wide: 1400px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.4s ease;
    --transition-slow: 0.6s ease;
    --transition-slower: 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-accent);
    background-color: var(--color-secondary);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

ul, ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-primary);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2vw, 1.5rem); }

p {
    margin-bottom: 1em;
}

.label-text {
    font-family: var(--font-accent);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--color-muted);
}

/* ---------- Layout ---------- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.container--wide {
    max-width: var(--max-width-wide);
}

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

.section--dark {
    background-color: var(--color-primary);
    color: var(--color-secondary);
}

.section--dark h2,
.section--dark h3,
.section--dark h4 {
    color: var(--color-secondary);
}

.section--light {
    background-color: var(--color-light-bg);
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-block;
    font-family: var(--font-accent);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    padding: 16px 40px;
    border: 2px solid var(--color-primary);
    position: relative;
    overflow: hidden;
    transition: color var(--transition-base), background-color var(--transition-base);
    z-index: 1;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background-color: var(--color-primary);
    transition: left var(--transition-base);
    z-index: -1;
}

.btn:hover::before {
    left: 0;
}

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

.btn--light {
    border-color: var(--color-secondary);
    color: var(--color-secondary);
}

.btn--light::before {
    background-color: var(--color-secondary);
}

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

/* ---------- Preloader ---------- */
.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.6s ease, visibility 0.6s ease;
}

.preloader.loaded {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.preloader__logo {
    width: 120px;
    opacity: 0;
    animation: preloaderFade 1.5s ease forwards;
}

@keyframes preloaderFade {
    0% { opacity: 0; transform: scale(0.8); }
    50% { opacity: 1; transform: scale(1); }
    100% { opacity: 1; transform: scale(1); }
}

/* ---------- Header / Navigation ---------- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: var(--space-md) 0;
    transition: background-color var(--transition-base), padding var(--transition-fast);
}

.site-header.scrolled {
    background-color: rgba(0, 0, 0, 0.95);
    padding: var(--space-sm) 0;
    backdrop-filter: blur(10px);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-logo img {
    height: 40px;
    width: auto;
}

.nav-menu {
    display: flex;
    gap: var(--space-lg);
}

.nav-menu a {
    font-family: var(--font-accent);
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--color-secondary);
    position: relative;
    padding-bottom: 4px;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-secondary);
    transition: width var(--transition-base);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

/* Hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 8px;
    z-index: 1001;
}

.hamburger span {
    display: block;
    width: 28px;
    height: 2px;
    background-color: var(--color-secondary);
    transition: transform var(--transition-base), opacity var(--transition-fast);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 6px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -6px);
}

/* Mobile menu overlay */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
    z-index: 999;
}

.mobile-menu.active {
    opacity: 1;
    visibility: visible;
}

.mobile-menu__nav {
    text-align: center;
}

.mobile-menu__nav a {
    display: block;
    font-family: var(--font-heading);
    font-size: 2.5rem;
    color: var(--color-secondary);
    padding: var(--space-sm) 0;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-base), transform var(--transition-base);
}

.mobile-menu.active .mobile-menu__nav a {
    opacity: 1;
    transform: translateY(0);
}

.mobile-menu.active .mobile-menu__nav a:nth-child(1) { transition-delay: 0.1s; }
.mobile-menu.active .mobile-menu__nav a:nth-child(2) { transition-delay: 0.2s; }
.mobile-menu.active .mobile-menu__nav a:nth-child(3) { transition-delay: 0.3s; }
.mobile-menu.active .mobile-menu__nav a:nth-child(4) { transition-delay: 0.4s; }
.mobile-menu.active .mobile-menu__nav a:nth-child(5) { transition-delay: 0.5s; }

/* ---------- Hero Slideshow ---------- */
.hero {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: hidden;
    background-color: var(--color-primary);
}

.hero__slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1.2s ease;
}

.hero__slide.active {
    opacity: 1;
}

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

.hero__overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        to bottom,
        rgba(0, 0, 0, 0.3) 0%,
        rgba(0, 0, 0, 0.5) 50%,
        rgba(0, 0, 0, 0.7) 100%
    );
}

.hero__content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    z-index: 2;
}

.hero__logo {
    width: 200px;
    margin: 0 auto var(--space-md);
}

.hero__subtitle {
    font-family: var(--font-accent);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 8px;
    text-transform: uppercase;
    color: var(--color-secondary);
    opacity: 0;
    animation: subtitleReveal 1.2s ease 0.5s forwards;
}

@keyframes subtitleReveal {
    from {
        opacity: 0;
        letter-spacing: 20px;
    }
    to {
        opacity: 1;
        letter-spacing: 8px;
    }
}

.hero__scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--color-secondary);
}

.hero__scroll span {
    font-family: var(--font-accent);
    font-size: 0.65rem;
    letter-spacing: 3px;
    text-transform: uppercase;
}

.hero__scroll-line {
    width: 1px;
    height: 40px;
    background-color: var(--color-secondary);
    animation: scrollLine 2s ease infinite;
}

@keyframes scrollLine {
    0% { transform: scaleY(0); transform-origin: top; }
    50% { transform: scaleY(1); transform-origin: top; }
    51% { transform: scaleY(1); transform-origin: bottom; }
    100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ---------- Intro Section ---------- */
.intro {
    position: relative;
}

.intro::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 80px;
    background-color: var(--color-primary);
    clip-path: polygon(0 0, 100% 0, 100% 0%, 0 100%);
}

.intro__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
}

.intro__heading {
    font-size: clamp(2rem, 4vw, 3.2rem);
    line-height: 1.15;
}

.intro__text {
    color: var(--color-muted);
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: var(--space-lg);
}

.intro__link {
    font-family: var(--font-accent);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    display: inline-flex;
    align-items: center;
    gap: 12px;
    transition: gap var(--transition-base);
}

.intro__link:hover {
    gap: 20px;
}

.intro__link svg {
    width: 20px;
    transition: transform var(--transition-base);
}

/* ---------- Featured Projects ---------- */
.featured-projects__grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    grid-template-rows: 1fr 1fr;
    gap: var(--space-md);
    min-height: 600px;
}

.featured-projects__grid .project-card:first-child {
    grid-row: 1 / -1;
}

/* ---------- Project Card ---------- */
.project-card {
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

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

.project-card:hover .project-card__image {
    transform: scale(1.03);
}

.project-card__overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-overlay-light);
    transition: background var(--transition-base);
}

.project-card:hover .project-card__overlay {
    background: var(--color-overlay);
}

/* Diagonal reveal on hover */
.project-card__diagonal {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-primary);
    clip-path: polygon(0 0, 0% 0, 0% 100%, 0 100%);
    transition: clip-path var(--transition-slower);
    display: flex;
    align-items: flex-end;
    padding: var(--space-lg);
}

.project-card:hover .project-card__diagonal {
    clip-path: polygon(0 0, 75% 0, 50% 100%, 0 100%);
}

.project-card__info {
    position: absolute;
    bottom: var(--space-lg);
    left: var(--space-lg);
    z-index: 2;
}

.project-card__category {
    font-family: var(--font-accent);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--color-muted);
    margin-bottom: var(--space-xs);
}

.project-card__title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--color-secondary);
    transform: translateY(10px);
    opacity: 0;
    transition: transform var(--transition-base), opacity var(--transition-base);
}

.project-card:hover .project-card__title {
    transform: translateY(0);
    opacity: 1;
}

/* ---------- Stats Section ---------- */
.stats {
    background-color: var(--color-primary);
}

.stats__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-lg);
    text-align: center;
}

.stats__item {
    padding: var(--space-xl) 0;
    border-right: 1px solid rgba(255, 255, 255, 0.1);
}

.stats__item:last-child {
    border-right: none;
}

.stats__number {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 4vw, 3.5rem);
    font-weight: 700;
    color: var(--color-secondary);
    line-height: 1;
    margin-bottom: var(--space-sm);
}

.stats__label {
    font-family: var(--font-accent);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--color-muted);
}

/* ---------- Services Section ---------- */
.services__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.service-card {
    padding: var(--space-xl) 0;
    border-bottom: 2px solid transparent;
    transition: border-color var(--transition-base);
}

.service-card:hover {
    border-bottom-color: var(--color-primary);
}

.service-card__icon {
    width: 48px;
    height: 48px;
    margin-bottom: var(--space-md);
    stroke: var(--color-primary);
    fill: none;
    stroke-width: 1.5;
}

.service-card__title {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    margin-bottom: var(--space-sm);
}

.service-card__text {
    color: var(--color-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ---------- CTA Section ---------- */
.cta {
    position: relative;
    min-height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.cta__overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-overlay);
}

.cta__content {
    position: relative;
    z-index: 2;
}

.cta__heading {
    font-size: clamp(2rem, 4vw, 3.5rem);
    color: var(--color-secondary);
    margin-bottom: var(--space-xl);
}

/* ---------- Footer ---------- */
.site-footer {
    background-color: var(--color-primary);
    color: rgba(255, 255, 255, 0.7);
    padding: var(--space-3xl) 0 var(--space-xl);
}

.footer__grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: var(--space-3xl);
    margin-bottom: var(--space-3xl);
}

.footer__logo {
    width: 150px;
    margin-bottom: var(--space-md);
}

.footer__description {
    font-size: 0.95rem;
    line-height: 1.7;
    max-width: 320px;
}

.footer__heading {
    font-family: var(--font-accent);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--color-secondary);
    margin-bottom: var(--space-md);
}

.footer__links a {
    display: block;
    padding: 6px 0;
    transition: color var(--transition-fast);
}

.footer__links a:hover {
    color: var(--color-secondary);
}

.footer__contact p {
    margin-bottom: var(--space-xs);
    font-size: 0.95rem;
}

.footer__social {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

.footer__social a {
    width: 40px;
    height: 40px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.footer__social a:hover {
    border-color: var(--color-secondary);
    background-color: var(--color-secondary);
}

.footer__social a:hover svg {
    stroke: var(--color-primary);
}

.footer__social svg {
    width: 18px;
    height: 18px;
    stroke: var(--color-secondary);
    fill: none;
    stroke-width: 2;
}

.footer__bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
}

/* ---------- Single Project ---------- */
.project-hero {
    position: relative;
    height: 70vh;
    overflow: hidden;
}

.project-hero__image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.project-hero__overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 60%);
}

.project-hero__content {
    position: absolute;
    bottom: var(--space-3xl);
    left: 0;
    width: 100%;
}

.project-hero__category {
    font-family: var(--font-accent);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--color-muted);
    margin-bottom: var(--space-sm);
}

.project-hero__title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    color: var(--color-secondary);
}

/* Project info bar */
.project-info-bar {
    background-color: var(--color-primary);
    padding: var(--space-lg) 0;
}

.project-info-bar__grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--space-lg);
    text-align: center;
}

.project-info-bar__item {
    border-right: 1px solid rgba(255, 255, 255, 0.1);
}

.project-info-bar__item:last-child {
    border-right: none;
}

.project-info-bar__label {
    font-family: var(--font-accent);
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--color-muted);
    margin-bottom: 4px;
}

.project-info-bar__value {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    color: var(--color-secondary);
}

/* Project gallery */
.project-gallery {
    padding: var(--space-section) 0;
}

.project-gallery__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-sm);
}

.project-gallery__item {
    overflow: hidden;
    cursor: pointer;
}

.project-gallery__item img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

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

/* Make every 4th image span 2 columns for visual variety */
.project-gallery__item:nth-child(4n+1) {
    grid-column: span 2;
}

.project-gallery__item:nth-child(4n+1) img {
    height: 400px;
}

/* Project navigation */
.project-nav {
    border-top: 1px solid var(--color-light-bg);
    padding: var(--space-xl) 0;
}

.project-nav .container {
    display: flex;
    justify-content: space-between;
}

.project-nav__link {
    font-family: var(--font-accent);
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 2px;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: gap var(--transition-base);
}

.project-nav__link:hover {
    gap: 20px;
}

/* Related projects */
.related-projects {
    background-color: var(--color-light-bg);
    padding: var(--space-section) 0;
}

.related-projects__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-xl);
}

.related-projects .project-card {
    height: 350px;
}

/* ---------- Archive / Portfolio Grid ---------- */
.portfolio-header {
    padding: 160px 0 var(--space-3xl);
    background-color: var(--color-primary);
    text-align: center;
}

.portfolio-header h1 {
    color: var(--color-secondary);
}

.portfolio-filters {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    padding: var(--space-xl) 0;
    flex-wrap: wrap;
}

.portfolio-filters button {
    font-family: var(--font-accent);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--color-muted);
    padding: var(--space-xs) var(--space-sm);
    border-bottom: 2px solid transparent;
    transition: color var(--transition-base), border-color var(--transition-base);
}

.portfolio-filters button:hover,
.portfolio-filters button.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
    padding-bottom: var(--space-section);
}

.portfolio-grid .project-card {
    height: 400px;
}

.load-more {
    text-align: center;
    padding-bottom: var(--space-section);
}

/* ---------- Page Template ---------- */
.page-header {
    padding: 160px 0 var(--space-3xl);
    background-color: var(--color-primary);
    text-align: center;
}

.page-header h1 {
    color: var(--color-secondary);
}

.page-content {
    padding: var(--space-section) 0;
}

.page-content p {
    font-size: 1.05rem;
    line-height: 1.8;
    max-width: 780px;
}

/* ---------- 404 ---------- */
.page-404 {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background-color: var(--color-primary);
}

.page-404__number {
    font-family: var(--font-heading);
    font-size: clamp(8rem, 15vw, 15rem);
    font-weight: 700;
    color: var(--color-accent);
    line-height: 1;
}

.page-404__text {
    font-size: 1.2rem;
    color: var(--color-muted);
    margin: var(--space-md) 0 var(--space-xl);
}

/* ---------- Lightbox ---------- */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.lightbox.active {
    opacity: 1;
    visibility: visible;
}

.lightbox__image {
    max-width: 90%;
    max-height: 90vh;
    object-fit: contain;
}

.lightbox__close {
    position: absolute;
    top: 30px;
    right: 30px;
    color: var(--color-secondary);
    font-size: 2rem;
    cursor: pointer;
    padding: 10px;
}

.lightbox__nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-secondary);
    font-size: 2rem;
    cursor: pointer;
    padding: 20px;
}

.lightbox__nav--prev { left: 20px; }
.lightbox__nav--next { right: 20px; }

/* ---------- Scroll Animations ---------- */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

.animate-on-scroll.stagger:nth-child(1) { transition-delay: 0s; }
.animate-on-scroll.stagger:nth-child(2) { transition-delay: 0.1s; }
.animate-on-scroll.stagger:nth-child(3) { transition-delay: 0.2s; }
.animate-on-scroll.stagger:nth-child(4) { transition-delay: 0.3s; }
.animate-on-scroll.stagger:nth-child(5) { transition-delay: 0.4s; }
.animate-on-scroll.stagger:nth-child(6) { transition-delay: 0.5s; }

/* ---------- Contact Form ---------- */
.contact-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: var(--space-sm);
    border: none;
    border-bottom: 1px solid var(--color-muted);
    font-family: var(--font-body);
    font-size: 1rem;
    margin-bottom: var(--space-lg);
    background: transparent;
    transition: border-color var(--transition-fast);
}

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

.contact-form textarea {
    min-height: 150px;
    resize: vertical;
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
    :root {
        --space-section: 80px;
    }

    .intro__grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }

    .featured-projects__grid {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto;
        min-height: auto;
    }

    .featured-projects__grid .project-card:first-child {
        grid-row: auto;
        grid-column: span 2;
        height: 400px;
    }

    .featured-projects__grid .project-card {
        height: 300px;
    }

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

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

    .project-info-bar__grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --space-section: 64px;
    }

    .nav-menu {
        display: none;
    }

    .hamburger {
        display: flex;
    }

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

    .stats__item {
        border-right: none;
    }

    .stats__item:nth-child(odd) {
        border-right: 1px solid rgba(255, 255, 255, 0.1);
    }

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

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

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

    .project-gallery__item:nth-child(4n+1) {
        grid-column: span 1;
    }

    .project-gallery__item:nth-child(4n+1) img {
        height: 300px;
    }

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

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

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

    .related-projects__grid {
        grid-template-columns: 1fr 1fr;
    }

    .cta {
        background-attachment: scroll;
    }

    .hero__logo {
        width: 150px;
    }
}

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

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

    .stats__item {
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .project-gallery__grid {
        grid-template-columns: 1fr;
    }

    .related-projects__grid {
        grid-template-columns: 1fr;
    }

    .featured-projects__grid {
        grid-template-columns: 1fr;
    }

    .featured-projects__grid .project-card:first-child {
        grid-column: span 1;
    }
}

/* ---------- Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }

    .animate-on-scroll {
        opacity: 1;
        transform: none;
    }

    html {
        scroll-behavior: auto;
    }
}