:root {
    --bg-dark: #0a0a0a;
    --bg-card: #141414;
    --bg-light: #f4f4f2;
    
    --text-main: #ffffff;
    --text-muted: #888888;
    --text-dark: #1a1a1a;
    
    --accent: #d4af37;
    --accent-dim: #a68a2e;
    
    --font-head: 'Syne', sans-serif;
    --font-body: 'Inter', sans-serif;
    
    --easing: cubic-bezier(0.16, 1, 0.3, 1);
    --radius: 4px;
}

@media (min-width: 901px) {
    html { scroll-behavior: smooth; }
}
* { margin: 0; padding: 0; box-sizing: border-box; }

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: #333; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

body {
    font-family: var(--font-body);
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; transition: color 0.2s ease, opacity 0.2s ease, background-color 0.2s ease; }
ul { list-style: none; }
img { width: 100%; height: 100%; object-fit: cover; display: block; }
img[loading="lazy"] { content-visibility: auto; }

h1, h2, h3, h4, .brand-font { 
    font-family: var(--font-head); 
    font-weight: 700; 
    text-transform: uppercase; 
    letter-spacing: -0.02em; 
    color: #fff;
}

header.menu-open {
    mix-blend-mode: normal !important;
    background: rgba(10, 10, 10, 1) !important;
    padding: 1.2rem 3rem !important;
}

.subtitle { 
    font-size: 0.7rem; 
    text-transform: uppercase; 
    letter-spacing: 0.2em; 
    color: var(--accent); 
    margin-bottom: 1.2rem; 
    display: inline-flex;
    align-items: center;
    font-weight: 600; 
}
.subtitle::before {
    content: ''; width: 30px; height: 1px; background: var(--accent); margin-right: 15px;
}

.container { max-width: 1400px; margin: 0 auto; padding: 0 2rem; position: relative; }

/* --- PRELOADER --- */
.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: #000;
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    transition: transform 0.45s ease;
}

.loader-content {
    overflow: hidden;
    position: relative;
}

.loader-logo {
    font-family: var(--font-head);
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: 5px;
    color: #fff;
    display: block;
    transform: translateY(100%);
    animation: revealText 0.55s ease forwards;
}

.loader-line {
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent);
    animation: growLine 0.65s ease-in-out forwards;
}

.preloader.hidden {
    transform: translateY(-100%);
}

@keyframes revealText {
    0% { transform: translateY(100%); }
    100% { transform: translateY(0); }
}

@keyframes growLine {
    0% { width: 0; }
    100% { width: 100%; }
}

.btn {
    display: inline-block;
    padding: 1rem 3rem;
    border: 1px solid rgba(255,255,255,0.2);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    font-weight: 600;
    background: rgba(255,255,255,0.03);
    position: relative;
    overflow: hidden;
    color: #fff;
    cursor: pointer;
    transition: 0.3s;
}
.btn:hover { background: #fff; color: #000; border-color: #fff; }

.btn-accent { border-color: var(--accent); color: var(--accent); }
.btn-accent:hover { background: var(--accent); color: #000; }

header {
    position: fixed; top: 0; left: 0; width: 100%;
    padding: 2rem 3rem;
    display: flex; justify-content: space-between; align-items: center;
    z-index: 1000;
    transition: background-color 0.2s ease, padding 0.2s ease;
    mix-blend-mode: difference;
}
header.scrolled {
    padding: 1.2rem 3rem;
    mix-blend-mode: normal;
    background: rgba(10, 10, 10, 0.85);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.logo { font-family: var(--font-head); font-size: 1.5rem; font-weight: 800; letter-spacing: 1px; color: #fff; }

nav ul { display: flex; gap: 3rem; }
nav ul li a { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.15em; opacity: 0.7; font-weight: 500; position: relative; }
nav ul li a::after {
    content: ''; position: absolute; bottom: -5px; left: 0; width: 0; height: 1px; background: var(--accent); transition: 0.3s;
}
nav ul li a:hover { opacity: 1; color: var(--accent); }
nav ul li a:hover::after { width: 100%; }

.menu-toggle { display: none; cursor: pointer; color: #fff; font-size: 1.5rem; }

.hero {
    height: 100vh;
    display: flex; align-items: center;
    position: relative;
    overflow: hidden;
}
.hero-bg {
    position: absolute; inset: 0;
    background: radial-gradient(circle at center, rgba(0,0,0,0.3) 0%, #0a0a0a 100%),
                url('https://images.unsplash.com/photo-1631679706909-1844bbd07221?q=75&w=1400&auto=format&fit=crop&ixlib=rb-4.0.3') center/cover no-repeat;
    opacity: 0.6;
    transform: scale(1.05);
    animation: breathe 45s infinite alternate;
}
@keyframes breathe { to { transform: scale(1.15); } }

.hero-content { position: relative; z-index: 2; width: 100%; padding: 0 10vw; margin-top: 5vh; }
.hero h1 { 
    font-size: clamp(3rem, 7vw, 7rem); 
    line-height: 0.95; 
    margin-bottom: 2rem; 
    background: linear-gradient(to right, #fff, #999);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.hero p { max-width: 500px; color: #ccc; font-weight: 300; margin-bottom: 3rem; font-size: 1.1rem; border-left: 1px solid var(--accent); padding-left: 1.5rem; }

.radio-wrapper { margin-bottom: 2rem; }
.radio-title { display: block; font-size: 0.9rem; color: #666; margin-bottom: 10px; }
.radio-group { display: flex; gap: 2rem; }
.radio-label { 
    display: flex; align-items: center; gap: 8px; 
    color: #fff; font-size: 0.9rem; cursor: pointer;
}
.radio-label input[type="radio"] {
    appearance: none; -webkit-appearance: none;
    width: 18px; height: 18px;
    border: 1px solid #666; border-radius: 50%;
    display: grid; place-content: center;
    transition: 0.3s; margin: 0;
}
.radio-label input[type="radio"]::before {
    content: ""; width: 10px; height: 10px;
    background: var(--accent); border-radius: 50%;
    transform: scale(0); transition: 0.3s;
}
.radio-label input[type="radio"]:checked { border-color: var(--accent); }
.radio-label input[type="radio"]:checked::before { transform: scale(1); }

.trust-bar {
    background: #111;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    padding: 3rem 0;
}
.trust-grid {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 2rem;
    text-align: center;
}
.trust-item h4 { font-size: 2.5rem; color: var(--accent); margin-bottom: 0.5rem; font-weight: 400; }
.trust-item p { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 1px; color: #666; }

.about { padding: 8rem 0; background: var(--bg-light); color: var(--text-dark); }
.about h2 { color: var(--text-dark); font-size: clamp(2rem, 4vw, 3.5rem); margin-bottom: 2rem; }
.about p { color: #555; margin-bottom: 1.5rem; }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 6rem; align-items: center; }

.about-img { position: relative; }
.about-img img { border-radius: var(--radius); }
.badge-cert {
    position: absolute; bottom: -20px; right: -20px;
    background: #fff; padding: 2rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    max-width: 200px;
}
.badge-cert h5 { font-family: var(--font-head); font-weight: 800; font-size: 2.5rem; line-height: 1; margin-bottom: 5px; }
.badge-cert span { font-size: 0.7rem; text-transform: uppercase; font-weight: 600; letter-spacing: 1px; }

/* =============================================
   SERVICES — nuova sezione con foto
============================================= */
.services {
    padding: 8rem 0;
    background: #0f0f0f;
    border-top: 1px solid rgba(255,255,255,0.05);
}

.services-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    border: 1px solid rgba(255,255,255,0.08);
}

.service-card {
    position: relative;
    overflow: hidden;
    aspect-ratio: 3/4;
    cursor: default;
}

/* foto di sfondo */
.service-card-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    transition: transform 0.9s cubic-bezier(0.16, 1, 0.3, 1), filter 0.9s ease;
    filter: brightness(0.55) saturate(0.6);
}

.service-card:hover .service-card-bg {
    transform: scale(1.04);
    filter: brightness(0.75) saturate(0.85);
}

/* overlay gradiente fisso in basso */
.service-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to top,
        rgba(0,0,0,0.88) 0%,
        rgba(0,0,0,0.25) 50%,
        rgba(0,0,0,0.05) 100%);
    z-index: 1;
    pointer-events: none;
}

/* linea verticale dorata tra le card */
.service-card:not(:last-child) {
    border-right: 1px solid rgba(255,255,255,0.08);
}

/* linea dorata che appare sull'hover dal basso */
.service-card-accent-line {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    z-index: 3;
    transition: width 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}
.service-card:hover .service-card-accent-line { width: 100%; }

.service-card-content {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 2.5rem 2.5rem 3rem;
    z-index: 2;
}

.service-card-num {
    font-family: var(--font-head);
    font-size: 0.75rem;
    color: var(--accent);
    letter-spacing: 0.25em;
    font-weight: 600;
    margin-bottom: 1rem;
    opacity: 0.8;
    display: block;
}

.service-card h3 {
    font-size: clamp(1.3rem, 2vw, 1.8rem);
    line-height: 1.1;
    margin-bottom: 1.2rem;
    color: #fff;
    transition: color 0.3s;
}
.service-card:hover h3 { color: var(--accent); }

.service-card p {
    color: rgba(255,255,255,0.70);
    font-size: 0.88rem;
    line-height: 1.7;
    max-width: 280px;
    transform: translateY(6px);
    opacity: 0.75;
    transition: opacity 0.5s ease, transform 0.5s ease;
}
.service-card:hover p {
    opacity: 1;
    transform: translateY(0);
    color: rgba(255,255,255,0.9);
}

/* tag etichetta in alto a sinistra */
.service-card-tag {
    position: absolute;
    top: 2rem;
    left: 2.5rem;
    z-index: 2;
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: rgba(255,255,255,0.3);
    font-weight: 500;
    transition: color 0.3s;
}
.service-card:hover .service-card-tag { color: var(--accent); }

/* =============================================
   PORTFOLIO — editorial masonry layout
============================================= */
.portfolio { padding: 8rem 0; background: var(--bg-dark); }
.portfolio-header { margin-bottom: 4rem; display: flex; justify-content: space-between; align-items: flex-end; }

/* Grid editoriale asimmetrica */
.portfolio-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1fr;
    grid-template-rows: auto auto;
    gap: 10px;
}

/* Prima foto: grande, occupa tutta la prima colonna, 2 righe */
.project-card:nth-child(1) {
    grid-column: 1;
    grid-row: 1 / 3;
    aspect-ratio: 3/4;
}
/* Seconda foto: colonna 2, riga 1 */
.project-card:nth-child(2) {
    grid-column: 2;
    grid-row: 1;
    aspect-ratio: 4/3;
}
/* Terza foto: colonna 3, riga 1 */
.project-card:nth-child(3) {
    grid-column: 3;
    grid-row: 1;
    aspect-ratio: 4/3;
}
/* Quarta foto: colonne 2+3, riga 2 — panoramica */
.project-card:nth-child(4) {
    grid-column: 2 / 4;
    grid-row: 2;
    aspect-ratio: 16/7;
}

.project-card {
    position: relative;
    overflow: hidden;
    border-radius: 2px;
    cursor: pointer;
}
.project-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1), filter 0.6s ease;
    filter: brightness(0.88) saturate(0.9);
    display: block;
}
.project-card:hover img {
    transform: scale(1.04);
    filter: brightness(1) saturate(1.05);
}

/* Overlay visibile sempre in basso, non solo hover */
.project-info {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 2rem 2rem 1.8rem;
    background: linear-gradient(to top, rgba(0,0,0,0.82) 0%, rgba(0,0,0,0.35) 60%, transparent 100%);
    transform: translateY(0);
    opacity: 1;
    transition: background 0.4s;
}
.project-card:hover .project-info {
    background: linear-gradient(to top, rgba(0,0,0,0.92) 0%, rgba(0,0,0,0.4) 60%, transparent 100%);
}
.project-info h4 {
    margin-bottom: 4px;
    font-size: 1rem;
    color: #fff;
    font-family: var(--font-head);
    letter-spacing: 0.02em;
}
.project-info span {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent);
}

/* Linea dorata che appare sull'hover */
.project-card::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0;
    width: 0; height: 2px;
    background: var(--accent);
    transition: width 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 2;
}
.project-card:hover::after { width: 100%; }

/* Performance: evita rendering anticipato delle sezioni fuori schermo */
.about, .services, .partners, .portfolio, .contact, footer {
    content-visibility: auto;
    contain-intrinsic-size: 900px;
}

.hero-bg, .service-card-bg, .project-card img, .track, .reveal {
    will-change: transform, opacity;
}

.partners { padding: 6rem 0 5rem; background: #fff; border-top: 1px solid #e5e5e5; border-bottom: 1px solid #e5e5e5; overflow: hidden; }
.partners-header { text-align: center; margin-bottom: 4rem; }
.marquee { display: flex; white-space: nowrap; overflow: hidden; padding: 2rem 0; }
.track { display: flex; animation: scroll 50s linear infinite; align-items: center; will-change: transform; }
.logo-item { 
    margin: 0 4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 180px;
    height: 60px;
    filter: grayscale(100%) opacity(0.4);
    transition: all 0.4s ease;
}
.logo-item:hover {
    filter: grayscale(0%) opacity(1);
}
.logo-item img {
    max-width: 160px;
    max-height: 55px;
    width: auto;
    height: auto;
    object-fit: contain;
}
@keyframes scroll { from { transform: translateX(0); } to { transform: translateX(-50%); } }

/* Mantiene il movimento dei loghi anche su dispositivi low-end, usando solo transform */
.marquee .track {
    animation: scroll 60s linear infinite;
    transform: translate3d(0, 0, 0);
    backface-visibility: hidden;
}

.contact { padding: 6rem 0; background: #0c0c0c; position: relative; }
.contact-layout { display: grid; grid-template-columns: 1fr 1.5fr; gap: 5rem; max-width: 1200px; margin: 0 auto; }
.contact-box { background: #111; padding: 3rem; border: 1px solid #222; border-radius: var(--radius); }

.form-group { margin-bottom: 2rem; position: relative; }
.form-input, .form-textarea {
    width: 100%; background: transparent; border: none; border-bottom: 1px solid #333;
    padding: 1rem 0; color: #fff; font-family: var(--font-body); font-size: 1rem;
    transition: 0.3s;
}
.form-input:focus, .form-textarea:focus { border-bottom-color: var(--accent); outline: none; }
.form-label {
    position: absolute; top: 1rem; left: 0; color: #666; font-size: 0.9rem; pointer-events: none; transition: 0.3s;
}
.form-input:focus ~ .form-label, .form-input:valid ~ .form-label,
.form-textarea:focus ~ .form-label, .form-textarea:valid ~ .form-label {
    top: -10px; font-size: 0.7rem; color: var(--accent);
}

.checkbox-group { display: flex; gap: 10px; align-items: flex-start; font-size: 0.75rem; color: #666; margin-bottom: 2rem; }
.checkbox-group input { margin-top: 3px; accent-color: var(--accent); }

#form-status {
    padding: 1rem;
    margin-top: 1rem;
    font-size: 0.85rem;
    border-radius: var(--radius);
    display: none;
    text-align: center;
}

footer { background: #050505; border-top: 1px solid #1a1a1a; padding: 5rem 0 2rem; color: #777; font-size: 0.85rem; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 3rem; margin-bottom: 4rem; }
.footer-col h5 { color: #fff; margin-bottom: 1.5rem; font-size: 0.9rem; }
.footer-col ul li { margin-bottom: 0.8rem; }
.footer-col ul li a:hover { color: var(--accent); }
.legal-row { border-top: 1px solid #1a1a1a; padding-top: 2rem; display: flex; justify-content: space-between; opacity: 0.5; }

.reveal { opacity: 0; transform: translateY(30px); transition: 1s var(--easing); }
.reveal.active { opacity: 1; transform: translateY(0); }

/* =============================================
   MEDIA QUERIES
============================================= */
@media (prefers-reduced-motion: reduce), (max-width: 700px) {
    html { scroll-behavior: auto !important; }
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    .preloader { display: none !important; }
    .hero-bg { transform: none !important; opacity: 0.5; }
    .service-card-bg, .project-card img { filter: brightness(0.78) saturate(0.9); }
    .service-card:hover .service-card-bg, .project-card:hover img { transform: none; }
    .reveal { opacity: 1; transform: none; }
    .about-img img { filter: grayscale(0%); }
}

@media (max-width: 700px) {
    .marquee .track {
        animation: scroll 70s linear infinite !important;
    }
}

@media (prefers-reduced-motion: reduce) {
    .marquee .track {
        animation: scroll 90s linear infinite !important;
    }
}

@media(max-width: 900px) {
    .hero h1 { font-size: 3.5rem; }
    .about-grid, .contact-layout, .footer-grid, .trust-grid { grid-template-columns: 1fr; gap: 3rem; }
    .services-cards { grid-template-columns: 1fr; }
    .service-card { aspect-ratio: 4/3; border-right: none !important; border-bottom: 1px solid rgba(255,255,255,0.08); }
    .service-card p { opacity: 1; transform: translateY(0); }
    .menu-toggle { display: block; position: relative; z-index: 1001; }
    nav { position: fixed; top: 0; right: -100%; width: 100%; height: 100vh; background: #0a0a0a; display: flex; align-items: center; justify-content: center; transition: 0.5s; z-index: 1000; }
    nav.active { right: 0; }
    nav ul { flex-direction: column; text-align: center; }
    .hero-content { padding: 0 2rem; }
    .badge-cert { display: none; }
    header.menu-open .menu-toggle { color: var(--accent); }
    .logo-item { min-width: 140px; margin: 0 2rem; }
    header { mix-blend-mode: normal; }

    .portfolio-grid {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto;
    }
    .project-card:nth-child(1) {
        grid-column: 1 / 3;
        grid-row: auto;
        aspect-ratio: 16/9;
    }
    .project-card:nth-child(2),
    .project-card:nth-child(3) {
        grid-column: auto;
        grid-row: auto;
        aspect-ratio: 4/3;
    }
    .project-card:nth-child(4) {
        grid-column: 1 / 3;
        grid-row: auto;
        aspect-ratio: 16/7;
    }
}

@media(max-width: 600px) {
    .portfolio-grid {
        grid-template-columns: 1fr;
    }
    .project-card:nth-child(1),
    .project-card:nth-child(4) {
        grid-column: 1;
        aspect-ratio: 4/3;
    }
}