/* ==========================================================================
   IM.MA Strutture Speciali — stylesheet
   ========================================================================== */

:root {
  --color-navy: #0d1b24;
  --color-navy-soft: #142a37;
  --color-accent: #4a90b8;
  --color-accent-light: #9bc4d8;
  --color-button: #2e5f7e;
  --color-button-hover: #24506b;
  --color-text: #1a1a1a;
  --color-text-gray: #5a6872;
  --color-text-gray-light: #8a97a0;
  --color-bg-light: #f5f7f8;
  --color-white: #ffffff;
  --color-border: #e2e6e8;

  --font-display: "Anton", "Arial Narrow", sans-serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --container-width: 1240px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

ul { list-style: none; }

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

input, textarea { font-family: inherit; font-size: 1rem; }

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 32px;
}

/* ---------- Shared type styles ---------- */
.eyebrow {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 14px;
}

.eyebrow--light { color: var(--color-white); }

h1, h2, h3 {
  font-family: var(--font-display);
  text-transform: uppercase;
  line-height: 0.98;
  letter-spacing: 0.01em;
}

h2 {
  font-size: clamp(2.1rem, 4.2vw, 3.4rem);
  color: var(--color-text);
  margin-bottom: 20px;
}

.rule {
  display: block;
  width: 70px;
  height: 3px;
  background: var(--color-accent);
  margin: 20px 0 28px;
}

.rule--center { margin-left: auto; margin-right: auto; }

.lead {
  color: var(--color-text-gray);
  font-size: 1.08rem;
  max-width: 680px;
}

.section-head--center {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.section-head--center .lead { margin-top: 4px; }

section { position: relative; }

/* ==========================================================================
   Header
   ========================================================================== */

.site-header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 8px 0;
}

.site-header.is-scrolled {
  position: fixed;
  background: rgba(13, 27, 36, 0.92);
  backdrop-filter: blur(6px);
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.15);
  animation: header-slide-down 0.25s ease;
}

@keyframes header-slide-down {
  from { transform: translateY(-100%); }
  to { transform: translateY(0); }
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 84px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand-icon { width: 38px; height: auto; }

.brand-text { display: flex; flex-direction: column; line-height: 1.15; }

.brand-name {
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: 0.02em;
  color: var(--color-white);
  text-transform: uppercase;
}

.brand-sub {
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.65);
}

.main-nav ul {
  display: flex;
  gap: 40px;
}

.main-nav a {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-white);
  padding: 6px 0;
  position: relative;
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--color-accent-light);
  transition: width 0.25s ease;
}

.main-nav a:hover::after { width: 100%; }

.header-right { display: flex; align-items: center; gap: 28px; }

.lang-switch { display: flex; gap: 14px; }

.lang-switch a {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.45);
}

.lang-switch a.active,
.lang-switch a:hover { color: var(--color-white); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-white);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
  position: relative;
  min-height: 640px;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  background: var(--color-navy);
}

.hero-media {
  position: absolute;
  inset: 0;
}

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

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    100deg,
    rgba(10, 20, 28, 0.82) 0%,
    rgba(10, 20, 28, 0.55) 38%,
    rgba(10, 20, 28, 0.05) 65%
  );
}

.hero-content {
  position: relative;
  z-index: 2;
  padding-top: 220px;
  padding-bottom: 72px;
  color: var(--color-white);
}

.hero-rule {
  display: block;
  width: 60px;
  height: 3px;
  background: var(--color-white);
  margin-bottom: 22px;
}

.hero-content .eyebrow { letter-spacing: 0.24em; }

.hero h1 {
  font-size: clamp(3rem, 8vw, 5.6rem);
  margin: 6px 0 24px;
}

.hero-text {
  font-size: 1.15rem;
  font-weight: 400;
  max-width: 480px;
  color: rgba(255, 255, 255, 0.92);
}

/* ==========================================================================
   Concept
   ========================================================================== */

.concept {
  padding: 120px 0;
}

.steps {
  margin-top: 72px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
}

.step-number {
  display: block;
  font-family: var(--font-display);
  font-size: 2.6rem;
  color: var(--color-accent-light);
  margin-bottom: 18px;
}

.step h3 {
  font-family: var(--font-body);
  text-transform: uppercase;
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding-bottom: 16px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--color-border);
}

.step p {
  color: var(--color-text-gray);
  font-size: 0.96rem;
}

/* ==========================================================================
   Portfolio
   ========================================================================== */

.portfolio {
  background: var(--color-navy);
  padding: 96px 0;
  color: var(--color-white);
}

.portfolio-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 56px;
}

.portfolio h2 { color: var(--color-white); margin-bottom: 0; }

.link-arrow {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent-light);
  white-space: nowrap;
  padding-bottom: 8px;
}

.link-arrow span { display: inline-block; transition: transform 0.2s ease; }

.link-arrow:hover span { transform: translateX(4px); }

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.portfolio-grid figure {
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--color-navy-soft);
}

.portfolio-grid img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.portfolio-grid figure:hover img { transform: scale(1.06); }

/* ==========================================================================
   Chi siamo / About
   ========================================================================== */

.about {
  background: var(--color-bg-light);
  padding: 120px 0;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  align-items: center;
}

.about-text p { color: var(--color-text-gray); margin-bottom: 20px; }
.about-text p:last-child { margin-bottom: 0; }

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

/* ==========================================================================
   Contact
   ========================================================================== */

.contact { padding: 120px 0; }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
}

.lead--left { margin-bottom: 40px; }

.contact-details {
  display: grid;
  gap: 22px;
}

.contact-details dt {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-gray-light);
  margin-bottom: 4px;
}

.contact-details dd { font-size: 1.02rem; font-weight: 500; }

.contact-form { display: flex; flex-direction: column; gap: 20px; }

.field label {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-gray);
  margin-bottom: 8px;
}

.field input,
.field textarea {
  width: 100%;
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 14px 16px;
  color: var(--color-text);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.field input::placeholder,
.field textarea::placeholder { color: var(--color-text-gray-light); }

.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  background: var(--color-white);
}

.field textarea { resize: vertical; min-height: 120px; }

.btn-submit {
  align-self: flex-start;
  background: var(--color-button);
  color: var(--color-white);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 16px 40px;
  border-radius: 4px;
  transition: background 0.2s ease;
}

.btn-submit:hover { background: var(--color-button-hover); }

.form-note {
  font-size: 0.88rem;
  color: var(--color-accent);
  min-height: 1.2em;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  background: var(--color-navy);
  color: rgba(255, 255, 255, 0.72);
  padding: 44px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-brand { display: flex; flex-direction: column; }
.footer-brand .brand-name { color: var(--color-white); font-size: 1.1rem; }
.footer-brand .brand-sub { font-size: 0.6rem; letter-spacing: 0.18em; text-transform: uppercase; color: rgba(255,255,255,0.5); }

.footer-copy { font-size: 0.85rem; color: rgba(255, 255, 255, 0.55); }

.footer-contact { text-align: right; font-size: 0.85rem; }
.footer-contact p { margin: 2px 0; }

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 960px) {
  .steps { grid-template-columns: repeat(2, 1fr); gap: 48px 32px; }
  .about-grid,
  .contact-grid { grid-template-columns: 1fr; gap: 48px; }
  .about-media { order: -1; }
  .portfolio-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 860px) {
  .main-nav {
    position: fixed;
    inset: 84px 0 0 0;
    background: rgba(13, 27, 36, 0.98);
    padding: 40px 32px;
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
  }

  .main-nav.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .main-nav ul { flex-direction: column; gap: 28px; }
  .main-nav a { font-size: 1.1rem; }

  .header-right { gap: 16px; }
  .lang-switch { display: none; }
  .nav-toggle { display: flex; }

  .site-header.is-scrolled .main-nav { background: rgba(13, 27, 36, 0.98); }

  .hero-content { padding-top: 180px; }
  .footer-inner { flex-direction: column; text-align: center; }
  .footer-contact { text-align: center; }
}

@media (max-width: 600px) {
  .container { padding: 0 20px; }
  .concept, .about, .contact { padding: 80px 0; }
  .portfolio { padding: 72px 0; }
  .steps { grid-template-columns: 1fr; gap: 40px; }
  .portfolio-grid { grid-template-columns: repeat(2, 1fr); gap: 6px; }
  .portfolio-head { flex-direction: column; align-items: flex-start; gap: 16px; }
  .hero { min-height: 560px; }
}