/* ==========================================================================
   Russoingegneria — Design Tokens & Base
   ========================================================================== */

:root {
  /* Colore blu e rosso derivati dal logo aziendale */
  --navy-950: #0a1830;
  --navy-900: #0e2350;
  --navy-800: #123170;
  --navy-700: #16419a;
  --navy-600: #1d51b8;
  --navy-500: #3468d1;
  --navy-100: #e6ecf9;
  --navy-50: #f2f5fc;

  --red-700: #a92a20;
  --red-600: #d5362a;
  --red-500: #e4493c;
  --red-100: #fbe2df;
  --red-50: #fdf1ef;

  --ink-900: #0f1420;
  --ink-700: #333c4c;
  --ink-500: #5c6579;
  --ink-300: #9aa3b5;
  --ink-150: #d3d8e2;
  --ink-100: #e7eaf1;

  --paper: #f7f8fb;
  --white: #ffffff;

  --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body: 'Inter', 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'Consolas', monospace;

  --container-max: 1240px;
  --radius-sm: 4px;
  --radius-md: 10px;
  --radius-lg: 18px;

  --shadow-sm: 0 1px 3px rgba(15, 20, 32, 0.08);
  --shadow-md: 0 8px 24px rgba(15, 20, 32, 0.10);
  --shadow-lg: 0 20px 48px rgba(15, 20, 32, 0.16);

  --dur-fast: 160ms;
  --dur-base: 240ms;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  --header-h: 76px;
}

/* ==========================================================================
   Reset
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

body, h1, h2, h3, h4, p, figure, blockquote, dl, dd {
  margin: 0;
}

body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-700);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

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

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

ul, ol { list-style: none; margin: 0; padding: 0; }

button, input, textarea, select {
  font: inherit;
  color: inherit;
}

button { cursor: pointer; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--ink-900);
  line-height: 1.15;
  font-weight: 600;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.1rem, 5vw + 1rem, 3.6rem); }
h2 { font-size: clamp(1.7rem, 3vw + 1rem, 2.6rem); }
h3 { font-size: clamp(1.25rem, 1.4vw + 1rem, 1.55rem); }
h4 { font-size: 1.1rem; }

p { max-width: 68ch; }

:focus-visible {
  outline: 2px solid var(--red-600);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ==========================================================================
   Layout helpers
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 20px;
}

@media (min-width: 768px) {
  .container { padding-inline: 32px; }
}

@media (min-width: 1024px) {
  .container { padding-inline: 40px; }
}

.section {
  padding-block: clamp(56px, 8vw, 108px);
}

.section--tight { padding-block: clamp(40px, 5vw, 72px); }

.section--navy {
  background: var(--navy-950);
  color: var(--navy-100);
}
.section--navy h2, .section--navy h3 { color: var(--white); }
.section--navy p { color: var(--navy-100); }

.section--paper-alt { background: var(--white); }

.section-head {
  max-width: 720px;
  margin-bottom: clamp(32px, 5vw, 56px);
}

.section-head--center { margin-inline: auto; text-align: center; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--red-600);
  font-weight: 600;
  margin-bottom: 14px;
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--red-600);
  display: inline-block;
}

.section--navy .eyebrow { color: #ff8f7f; }
.section--navy .eyebrow::before { background: #ff8f7f; }

.lede {
  font-size: 1.1rem;
  color: var(--ink-500);
  margin-top: 14px;
}

/* Wider measure for hero/page-hero intro paragraphs, so they feel proportional
   to the full-width heading above them instead of reading as a narrow column. */
.lede--intro { max-width: none; }

.section--navy .lede { color: var(--ink-150); }

/* Blueprint grid texture, used behind hero / dark sections */
.blueprint-bg {
  position: relative;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  background-position: center;
}

/* Diagonal red accent bar echoing the logo's crossing stripes */
.accent-slash {
  position: relative;
  display: inline-block;
}
.accent-slash::after {
  content: "";
  position: absolute;
  left: -4px;
  right: -4px;
  bottom: 4px;
  height: 34%;
  background: linear-gradient(100deg, var(--red-500), var(--red-600));
  opacity: 0.18;
  transform: skewX(-12deg);
  z-index: -1;
  border-radius: 2px;
}

/* Corner brackets, like technical drawing registration marks */
.corner-frame {
  position: relative;
}
.corner-frame::before,
.corner-frame::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border: 2px solid var(--red-600);
  opacity: 0.85;
}
.corner-frame::before { top: -8px; left: -8px; border-right: none; border-bottom: none; }
.corner-frame::after { bottom: -8px; right: -8px; border-left: none; border-top: none; }

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 26px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.98rem;
  border: 2px solid transparent;
  transition: transform var(--dur-fast) var(--ease-out), background var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out), color var(--dur-base) var(--ease-out);
  white-space: nowrap;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--red-600);
  color: var(--white);
}
.btn-primary:hover { background: var(--red-700); }

.btn-outline {
  background: transparent;
  border-color: var(--navy-100);
  color: var(--white);
}
.btn-outline:hover { border-color: var(--white); background: rgba(255,255,255,0.06); }

.btn-ghost {
  background: transparent;
  border-color: var(--ink-150);
  color: var(--ink-900);
}
.btn-ghost:hover { border-color: var(--navy-700); color: var(--navy-700); }

.btn-block { width: 100%; }

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.98);
  border-bottom: 1px solid var(--ink-100);
  height: var(--header-h);
  display: flex;
  align-items: center;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.brand img { height: 42px; width: auto; }
.brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--ink-900);
  line-height: 1.1;
}
.brand__tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: var(--ink-500);
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav__link {
  position: relative;
  padding: 10px 16px;
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--ink-700);
  border-radius: var(--radius-sm);
  transition: color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}
.nav__link:hover { color: var(--navy-700); background: var(--navy-50); }
.nav__link[aria-current="page"] { color: var(--navy-700); font-weight: 700; }
.nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 4px;
  height: 2px;
  background: var(--red-600);
}

.nav-actions { display: flex; align-items: center; gap: 12px; }

.nav-toggle {
  display: none;
  background: transparent;
  border: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
}
.nav-toggle:hover { background: var(--navy-50); }
.nav-toggle svg { width: 26px; height: 26px; }

@media (max-width: 1023px) {
  .nav-toggle { display: inline-flex; }

  .nav {
    position: fixed;
    inset: var(--header-h) 0 0 0;
    background: var(--white);
    flex-direction: column;
    align-items: stretch;
    padding: 20px;
    gap: 4px;
    transform: translateX(100%);
    transition: transform var(--dur-base) var(--ease-out);
    overflow-y: auto;
  }
  .nav.is-open { transform: translateX(0); }
  .nav__link { padding: 16px; font-size: 1.05rem; border-bottom: 1px solid var(--ink-100); }
  .nav__link[aria-current="page"]::after { display: none; }
  .nav-actions--desktop { display: none; }
  .nav .btn { margin-top: 12px; }
}

@media (min-width: 1024px) {
  .nav__cta { display: none; }
}

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

.hero {
  position: relative;
  background: radial-gradient(1100px 520px at 82% -10%, var(--navy-800), var(--navy-950) 60%);
  color: var(--white);
  overflow: hidden;
  padding-block: clamp(64px, 10vw, 128px) clamp(72px, 9vw, 120px);
}

.hero__grid {
  display: grid;
  gap: 48px;
  align-items: center;
}

@media (min-width: 1024px) {
  .hero__grid { grid-template-columns: 1.1fr 0.9fr; gap: 40px; }
}

.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #ff8f7f;
  margin-bottom: 18px;
  display: block;
}

.hero h1 { color: var(--white); }
.hero h1 em {
  font-style: normal;
  color: var(--white);
  position: relative;
}
.hero h1 em::after {
  content: "";
  position: absolute;
  left: -2%;
  right: -2%;
  bottom: 6%;
  height: 30%;
  background: linear-gradient(100deg, var(--red-600), var(--red-500));
  opacity: 0.55;
  transform: skewX(-10deg);
  z-index: -1;
}

.hero p.lede { color: var(--navy-100); }

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

/* ==========================================================================
   Stat strip
   ========================================================================== */

.stat-strip {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-top: 56px;
  max-width: 640px;
}

@media (min-width: 768px) {
  .stat-strip { grid-template-columns: repeat(4, 1fr); }
}

.stat-strip.stat-strip--3 { grid-template-columns: 1fr; }
@media (min-width: 640px) {
  .stat-strip.stat-strip--3 { grid-template-columns: repeat(3, 1fr); }
}

.stat {
  background: rgba(255,255,255,0.03);
  padding: 22px 18px;
  text-align: center;
}
.stat__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.6rem, 2.6vw, 2.1rem);
  color: var(--white);
}
.stat__label {
  font-size: 0.82rem;
  color: var(--navy-100);
  margin-top: 6px;
}

/* ==========================================================================
   Cards
   ========================================================================== */

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

@media (min-width: 640px) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
  .grid--4 { grid-template-columns: repeat(4, 1fr); }
}

.card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  background: var(--white);
  border: 1px solid var(--ink-100);
  border-radius: var(--radius-lg);
  padding: 30px 26px;
  transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

.card__icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--navy-50);
  color: var(--navy-700);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}
.card__icon svg { width: 26px; height: 26px; }

.card h3 { margin-bottom: 10px; }
.card p { color: var(--ink-500); font-size: 0.96rem; }

.card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--navy-700);
}
.card__link svg { width: 16px; height: 16px; transition: transform var(--dur-fast) var(--ease-out); }
.card__link:hover svg { transform: translateX(3px); }

.service-card {
  scroll-margin-top: calc(var(--header-h) + 20px);
}

/* Value / feature list with numbered mono labels */
.value-list {
  display: grid;
  gap: 28px;
  grid-template-columns: 1fr;
}
@media (min-width: 768px) { .value-list { grid-template-columns: repeat(2, 1fr); } }

.value-item { display: flex; gap: 18px; }
.value-item__num {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--red-600);
  font-size: 0.95rem;
  flex-shrink: 0;
  padding-top: 4px;
}
.value-item h4 { margin-bottom: 6px; }
.value-item p { color: var(--ink-500); font-size: 0.95rem; }

/* ==========================================================================
   Timeline (Chi siamo)
   ========================================================================== */

.timeline {
  position: relative;
  padding-left: 28px;
  border-left: 2px solid var(--ink-100);
}
.timeline__item { position: relative; padding-bottom: 40px; }
.timeline__item:last-child { padding-bottom: 0; }
.timeline__item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--red-600);
  box-shadow: 0 0 0 4px var(--red-50);
}
.timeline__year {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--navy-700);
  font-size: 0.9rem;
  margin-bottom: 6px;
  display: block;
}

/* ==========================================================================
   Forms
   ========================================================================== */

.form-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: 1fr;
}
@media (min-width: 640px) { .form-grid--2 { grid-template-columns: 1fr 1fr; } }

.field { display: flex; flex-direction: column; gap: 8px; }
.field--full { grid-column: 1 / -1; }

.field label {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--ink-900);
}
.field label .req { color: var(--red-600); margin-left: 2px; }

.field input,
.field select,
.field textarea {
  min-height: 48px;
  padding: 0 16px;
  border: 1.5px solid var(--ink-150);
  border-radius: var(--radius-sm);
  background: var(--white);
  transition: border-color var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
}
.field textarea { padding: 14px 16px; min-height: 140px; resize: vertical; }
.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--navy-600);
  box-shadow: 0 0 0 4px var(--navy-100);
  outline: none;
}
.field small { color: var(--ink-500); font-size: 0.82rem; }
.field--error input, .field--error textarea { border-color: var(--red-600); }
.field__error {
  color: var(--red-600);
  font-size: 0.82rem;
  display: none;
}
.field--error .field__error { display: block; }

.form-status {
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  font-size: 0.92rem;
  display: none;
  margin-bottom: 20px;
}
.form-status.is-visible { display: block; }
.form-status--success { background: #e9f7ee; color: #1c6b3a; border: 1px solid #bfe6cc; }
.form-status--error { background: var(--red-50); color: var(--red-700); border: 1px solid var(--red-100); }

/* ==========================================================================
   Contact cards / map
   ========================================================================== */

.office-card {
  background: var(--white);
  border: 1px solid var(--ink-100);
  border-radius: var(--radius-lg);
  padding: 28px;
}
.office-card__badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--navy-700);
  background: var(--navy-50);
  border-radius: 999px;
  padding: 5px 12px;
  margin-bottom: 14px;
}
.office-card dl { margin-top: 16px; display: grid; gap: 12px; }

.office-card dt {
  font-size: 0.78rem;
  color: var(--ink-500);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.office-card dd { font-weight: 600; color: var(--ink-900); margin-top: 2px; }

.map-frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--ink-100);
  height: 100%;
  min-height: 320px;
}
.map-frame iframe { width: 100%; height: 100%; min-height: 320px; border: 0; }

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

.site-footer {
  background: var(--navy-950);
  color: var(--navy-100);
  padding-block: 56px 28px;
}
.footer-grid {
  display: grid;
  gap: 40px;
  grid-template-columns: 1fr;
}
@media (min-width: 768px) {
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr 1fr; }
}
.footer-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.footer-brand img { height: 38px; }
.footer-brand strong { font-family: var(--font-display); color: var(--white); font-size: 1.05rem; }
.site-footer p { color: var(--ink-300); font-size: 0.92rem; }
.footer-col h5 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--white);
  margin-bottom: 16px;
}
.footer-col ul { display: grid; gap: 10px; }
.footer-col a {
  color: var(--ink-300);
  font-size: 0.92rem;
  transition: color var(--dur-fast) var(--ease-out);
}
.footer-col a:hover { color: var(--white); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  margin-top: 48px;
  padding-top: 24px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--ink-300);
}

/* Certification badges (ISO 9001 / ANFOS) */
.footer-certs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 28px;
  border-top: 1px solid rgba(255,255,255,0.1);
  margin-top: 40px;
  padding-top: 28px;
}
.footer-cert {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  color: var(--ink-300);
  font-size: 0.84rem;
  max-width: 320px;
  transition: color var(--dur-fast) var(--ease-out);
}
.footer-cert:hover { color: #fff; }
.footer-cert img {
  height: 52px;
  width: auto;
  background: #fff;
  border-radius: 6px;
  padding: 4px;
  flex-shrink: 0;
}

/* Certification detail cards (Certificazioni page) */
.cert-logo-card {
  background: var(--white);
  border: 1px solid var(--ink-100);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.cert-logo-card img {
  max-width: 260px;
  width: 100%;
  height: auto;
}

/* ==========================================================================
   CTA band
   ========================================================================== */

.cta-band {
  background: var(--navy-900);
  color: var(--white);
  border-radius: var(--radius-lg);
  padding: clamp(36px, 6vw, 64px);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}
.cta-band h2 { color: var(--white); margin-bottom: 8px; }
.cta-band p { color: var(--navy-100); margin: 0; }

/* ==========================================================================
   Page hero (interior pages)
   ========================================================================== */

.page-hero {
  background: var(--navy-950);
  color: var(--white);
  padding-block: clamp(48px, 7vw, 84px) clamp(56px, 7vw, 90px);
}
.page-hero h1 { color: var(--white); }
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--navy-100);
  display: flex;
  gap: 8px;
  margin-bottom: 18px;
}
.breadcrumb a:hover { color: var(--white); }

/* ==========================================================================
   Accordion (Formazione FAQ)
   ========================================================================== */

.accordion-item {
  border: 1px solid var(--ink-100);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  background: var(--white);
}
.accordion-trigger {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
  background: transparent;
  border: none;
  text-align: left;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.02rem;
  color: var(--ink-900);
}
.accordion-trigger svg {
  width: 20px; height: 20px;
  flex-shrink: 0;
  transition: transform var(--dur-base) var(--ease-out);
  color: var(--navy-700);
}
.accordion-trigger[aria-expanded="true"] svg { transform: rotate(45deg); }
.accordion-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--dur-base) var(--ease-out);
}
.accordion-panel__inner { padding: 0 22px 20px; color: var(--ink-500); }

/* ==========================================================================
   Reveal on scroll
   ========================================================================== */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 560ms var(--ease-out), transform 560ms var(--ease-out);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
}

/* ==========================================================================
   Utilities
   ========================================================================== */

.mt-0 { margin-top: 0 !important; }
.text-center { text-align: center; }
.flow > * + * { margin-top: 16px; }
.badge-list { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.badge {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  border: 1px solid var(--ink-150);
  border-radius: 999px;
  padding: 7px 14px;
  color: var(--ink-700);
}
.section--navy .badge {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.14);
  color: #fff;
}
.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  background: var(--navy-900);
  color: var(--white);
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  z-index: 200;
  transition: top var(--dur-fast) var(--ease-out);
}
.skip-link:focus { top: 12px; }