/* Purotech — brand tokens from the Brand Identity Study (Color option 1, Sora) */
:root {
  --blue: #228CDB;
  --blue-600: #1A78C2;
  --blue-50: #EAF4FC;
  --navy: #0A2A41;
  --ink: #030E15;
  --violet: #8844FF;
  --rose: #D55672;
  --white: #FFFFFF;
  --bg-alt: #F4F8FC;
  --text: #0E2233;
  --muted: #4E6274;
  --line: #DCE6EF;

  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 20px 50px -24px rgba(10, 42, 65, .35);
  --container: 1180px;
  --font: "Sora", system-ui, -apple-system, "Segoe UI", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-weight: 300;
  font-size: 17px;
  line-height: 1.65;
  color: var(--text);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: var(--blue-600); }
h1, h2, h3 { line-height: 1.15; margin: 0; letter-spacing: -0.02em; }
h1 { font-weight: 700; font-size: clamp(2.4rem, 6vw, 4.6rem); }
h2 { font-weight: 700; font-size: clamp(1.8rem, 3.6vw, 2.75rem); }
h3 { font-weight: 600; font-size: 1.15rem; }
p { margin: 0; }
strong { font-weight: 600; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
@media (max-width: 600px) { .container { padding: 0 16px; } }

.skip { position: absolute; left: -9999px; top: 0; background: var(--blue); color: #fff; padding: 10px 16px; z-index: 100; }
.skip:focus { left: 16px; top: 16px; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5em;
  font: 600 .95rem/1 var(--font);
  padding: 14px 22px; border-radius: 999px;
  text-decoration: none; border: 1.5px solid transparent; cursor: pointer;
  transition: transform .2s ease, background-color .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.btn:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, button:focus-visible {
  outline: 3px solid rgba(34, 140, 219, .55); outline-offset: 3px;
}
.btn-primary { background: var(--blue); color: #fff; box-shadow: 0 10px 30px -12px rgba(34, 140, 219, .8); }
.btn-primary:hover { background: var(--blue-600); transform: translateY(-2px); }
.btn-ghost { color: #fff; border-color: rgba(255, 255, 255, .35); }
.btn-ghost:hover { border-color: #fff; background: rgba(255, 255, 255, .08); }
.btn-sm { padding: 10px 18px; font-size: .88rem; }
.btn-lg { padding: 17px 28px; font-size: 1rem; }
.btn-block { width: 100%; }

/* Header */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  transition: background-color .3s ease, box-shadow .3s ease;
}
.site-header.scrolled { background: rgba(3, 14, 21, .86); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); box-shadow: 0 1px 0 rgba(255,255,255,.06); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 76px; }
.brand { display: inline-flex; align-items: center; text-decoration: none; }
.brand .logo { height: 34px; width: auto; }
@media (max-width: 600px) { .brand .logo { height: 26px; } }
.menu { display: flex; align-items: center; gap: 30px; }
.menu a:not(.btn) { color: rgba(255,255,255,.82); text-decoration: none; font-size: .93rem; font-weight: 400; transition: color .2s; }
.menu a:not(.btn):hover { color: #fff; }
.nav-toggle { display: none; background: none; border: 0; width: 44px; height: 44px; cursor: pointer; position: relative; }
.nav-toggle span { position: absolute; left: 11px; right: 11px; height: 2px; background: #fff; border-radius: 2px; transition: transform .25s ease, top .25s ease; }
.nav-toggle span:first-child { top: 17px; }
.nav-toggle span:last-child { top: 25px; }
.nav-toggle[aria-expanded="true"] span:first-child { top: 21px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:last-child { top: 21px; transform: rotate(-45deg); }

@media (max-width: 860px) {
  .nav-toggle { display: block; }
  .menu {
    position: fixed; inset: 76px 0 auto 0; flex-direction: column; align-items: stretch; gap: 0;
    background: rgba(3, 14, 21, .97); padding: 8px 16px 24px;
    transform: translateY(-8px); opacity: 0; visibility: hidden; transition: all .25s ease;
  }
  .menu.open { transform: none; opacity: 1; visibility: visible; }
  .menu a:not(.btn) { padding: 16px 4px; border-bottom: 1px solid rgba(255,255,255,.08); font-size: 1.05rem; }
  .menu .btn { margin-top: 18px; padding: 16px; }
  .site-header:has(.menu.open) { background: rgba(3, 14, 21, .97); }
}

/* Hero */
.hero {
  position: relative; min-height: 100vh; min-height: 100svh;
  display: flex; align-items: center;
  background: var(--ink); color: #fff; overflow: hidden;
  padding: 120px 0 90px;
}
.hero-bg video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 70% center; }
.hero::after {
  content: ""; position: absolute; inset: 0;
  background:
    linear-gradient(90deg, rgba(3,14,21,.95) 0%, rgba(3,14,21,.78) 40%, rgba(3,14,21,.15) 75%),
    linear-gradient(0deg, rgba(3,14,21,.85) 0%, rgba(3,14,21,0) 30%);
}
.hero-inner { position: relative; z-index: 1; }
.hero h1 { max-width: 15ch; margin: 0 0 24px; }
.grad { color: #4488FF; }
.lead { font-size: clamp(1.05rem, 1.6vw, 1.25rem); color: rgba(255,255,255,.82); max-width: 560px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 38px; }
.scroll-cue { position: absolute; z-index: 1; bottom: 28px; left: 50%; transform: translateX(-50%); width: 26px; height: 42px; border: 1.5px solid rgba(255,255,255,.4); border-radius: 20px; }
.scroll-cue span { position: absolute; left: 50%; top: 8px; width: 4px; height: 8px; margin-left: -2px; background: #fff; border-radius: 2px; animation: cue 1.8s infinite; }
@keyframes cue { 0% { opacity: 0; transform: translateY(0); } 40% { opacity: 1; } 100% { opacity: 0; transform: translateY(14px); } }
@media (max-width: 1000px) {
  .hero::after { background: linear-gradient(90deg, rgba(3,14,21,.95) 0%, rgba(3,14,21,.85) 55%, rgba(3,14,21,.45) 100%); }
}
@media (max-width: 600px) {
  .hero { align-items: flex-end; padding-bottom: 80px; }
  .hero::after { background: linear-gradient(0deg, rgba(3,14,21,.97) 0%, rgba(3,14,21,.82) 55%, rgba(3,14,21,.35) 100%); }
  .cta-row .btn { width: 100%; }
  .scroll-cue { display: none; }
}

/* Sections */
.section { padding: clamp(80px, 11vw, 140px) 0; }
.section-alt { background: var(--bg-alt); }
.section-dark { background: radial-gradient(1200px 600px at 85% 0%, rgba(34,140,219,.22), transparent 60%), var(--navy); color: #fff; }
.section-head { max-width: 760px; margin-bottom: 56px; }
.section-head h2 { margin: 12px 0 18px; }
.kicker { font-size: .8rem; font-weight: 600; letter-spacing: .16em; text-transform: uppercase; color: var(--blue); }
.kicker-light { color: #6BBEF7; }
.sub { color: var(--muted); font-size: 1.07rem; }
.sub + .sub { margin-top: 14px; }
.section-dark .sub { color: rgba(255,255,255,.75); }
.two-col h2 + .sub, .two-col .kicker + h2 { margin-top: 12px; }
.two-col h2 { margin-bottom: 18px; }

/* Stats */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-bottom: 26px; }
.stat { padding: 28px 24px; border-radius: var(--radius); background: var(--white); border: 1px solid var(--line); position: relative; overflow: hidden; }
.stat::before { content: ""; position: absolute; left: 0; top: 0; height: 3px; width: 100%; background: linear-gradient(90deg, var(--rose), var(--violet)); }
.stat-num { font-size: clamp(2rem, 3.4vw, 2.6rem); font-weight: 700; letter-spacing: -0.03em; color: var(--navy); line-height: 1.1; }
.stat-label { margin-top: 10px; color: var(--muted); font-size: .95rem; line-height: 1.5; }
@media (max-width: 960px) { .stats { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .stats { grid-template-columns: 1fr; } }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 760px) { .split { grid-template-columns: 1fr; } }
.card { border-radius: var(--radius); padding: 32px; }
.card-soft { background: var(--blue-50); }
.card h3 { margin-bottom: 10px; color: var(--navy); }
.card p { color: var(--muted); }
.source { margin-top: 26px; font-size: .78rem; color: #7C8D9C; }

/* Two columns with media */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(36px, 6vw, 80px); align-items: center; }
@media (max-width: 860px) {
  .two-col { grid-template-columns: 1fr; }
  .two-col-rev .media { order: -1; }
}
.media { position: relative; }
.media img { border-radius: 24px; box-shadow: var(--shadow); width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: cover; }
.badge-o3 {
  position: absolute; right: -14px; bottom: -18px;
  width: 104px; height: 104px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: var(--white); color: var(--navy); box-shadow: var(--shadow);
  font-size: 2rem; font-weight: 700;
}
.badge-o3 sub { font-size: .55em; }
@media (max-width: 600px) { .badge-o3 { right: 12px; width: 80px; height: 80px; font-size: 1.6rem; } }

.note { margin-top: 26px; font-size: .95rem; padding: 18px 20px; border-left: 3px solid var(--blue); background: var(--white); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--text); }

/* Project pillars */
.ico { flex: 0 0 48px; width: 48px; height: 48px; border-radius: 14px; background: var(--blue-50); display: grid; place-items: center; }
.ico svg { width: 24px; height: 24px; fill: none; stroke: var(--blue); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.ico-dark { background: rgba(68, 136, 255, .16); }
.ico-dark svg { stroke: #7FB3FF; }
.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.pillar { padding: 32px 28px; border-radius: var(--radius); background: rgba(255,255,255,.05); border: 1px solid rgba(255,255,255,.1); }
.pillar h3 { margin: 22px 0 10px; }
.pillar p { color: rgba(255,255,255,.72); font-size: .97rem; }
@media (max-width: 860px) { .pillars { grid-template-columns: 1fr; } }

/* Collaboration network */
.network { list-style: none; padding: 0; margin: 30px 0 0; display: grid; gap: 12px; }
.network li { display: flex; align-items: center; gap: 16px; padding: 14px 18px 14px 14px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-sm); font-weight: 400; color: var(--navy); }
.network .ico { flex-basis: 42px; width: 42px; height: 42px; border-radius: 12px; }
.network .ico svg { width: 21px; height: 21px; }

/* Team */
.team { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.person { padding: 32px 28px; border-radius: var(--radius); border: 1px solid var(--line); }
.avatar {
  display: grid; place-items: center; width: 72px; height: 72px; border-radius: 50%;
  background: linear-gradient(135deg, var(--blue), var(--navy)); color: #fff; font-weight: 600; font-size: 1.2rem; letter-spacing: .04em;
  margin-bottom: 22px;
}
.person h3 { font-size: 1.25rem; color: var(--navy); }
.role { color: var(--blue); font-size: .9rem; font-weight: 400; margin: 4px 0 14px; }
.person p:last-child { color: var(--muted); font-size: .95rem; }
@media (max-width: 860px) { .team { grid-template-columns: 1fr; } }

/* Mission */
.mission {
  background: radial-gradient(900px 500px at 50% 120%, rgba(136,68,255,.28), transparent 60%), radial-gradient(900px 500px at 50% -20%, rgba(34,140,219,.3), transparent 60%), var(--ink);
  color: #fff; text-align: center; padding: clamp(90px, 12vw, 150px) 0;
}
.mission-inner { display: flex; flex-direction: column; align-items: center; }
.mission-claim { font-size: clamp(3rem, 9vw, 6.5rem); font-weight: 200; letter-spacing: -0.04em; line-height: 1; margin: 28px 0 24px; }
.mission-text { max-width: 620px; color: rgba(255,255,255,.78); font-size: 1.12rem; }

/* Contact */
.contact { display: grid; grid-template-columns: 1fr 1.05fr; gap: clamp(36px, 6vw, 80px); align-items: start; }
.contact h2 { margin: 12px 0 18px; }
.contact-list { list-style: none; padding: 0; margin: 34px 0 0; display: grid; gap: 14px; }
.contact-list li { display: flex; gap: 18px; padding-bottom: 14px; border-bottom: 1px solid var(--line); }
.contact-list span { width: 64px; flex: none; color: var(--muted); font-size: .9rem; }
.contact-list a { font-weight: 400; text-decoration: none; }
.form { background: var(--white); padding: clamp(24px, 4vw, 40px); border-radius: 24px; box-shadow: var(--shadow); display: grid; gap: 18px; }
.field { display: grid; gap: 7px; }
.field label { font-size: .88rem; font-weight: 400; color: var(--text); }
.field input, .field select, .field textarea {
  width: 100%; font: 300 1rem/1.4 var(--font); color: var(--text);
  padding: 14px 16px; border-radius: var(--radius-sm); border: 1.5px solid var(--line); background: var(--bg-alt);
  transition: border-color .2s, background-color .2s;
}
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--blue); background: #fff; }
.field textarea { resize: vertical; min-height: 120px; }
.field .invalid { border-color: var(--rose); }
.consent { display: flex; gap: 12px; align-items: flex-start; font-size: .85rem; color: var(--muted); line-height: 1.5; }
.consent input { margin-top: 3px; width: 18px; height: 18px; accent-color: var(--blue); flex: none; }
.form-msg { font-size: .9rem; min-height: 1.4em; }
.form-msg.err { color: var(--rose); }
.form-msg.ok { color: #1C8A5A; }
@media (max-width: 860px) { .contact { grid-template-columns: 1fr; } }

/* Footer */
.site-footer { background: var(--ink); color: rgba(255,255,255,.7); padding: 64px 0 36px; font-size: .92rem; }
.footer-grid { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,.08); }
.footer-tag { margin-top: 14px; color: rgba(255,255,255,.55); }
.footer-links { display: flex; flex-wrap: wrap; gap: 14px 28px; align-items: flex-start; }
.footer-links a { color: rgba(255,255,255,.75); text-decoration: none; }
.footer-links a:hover { color: #fff; }
.footer-legal { padding-top: 28px; display: grid; gap: 12px; font-size: .8rem; color: rgba(255,255,255,.5); }
.disclaimer { max-width: 860px; }

/* Reveal on scroll */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .8s ease, transform .8s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }
.no-js .reveal { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .scroll-cue span { animation: none; }
}

/* Legal page */
.legal { padding: 140px 0 100px; }
.legal .container { max-width: 800px; }
.legal h1 { font-size: clamp(2rem, 4vw, 3rem); margin-bottom: 24px; color: var(--navy); }
.legal h2 { font-size: 1.3rem; margin: 36px 0 12px; color: var(--navy); }
.legal p, .legal li { color: var(--muted); margin-bottom: 12px; }
.site-header.solid { background: var(--ink); }

/* Comfortable touch targets on phones (min ~44px) */
@media (max-width: 860px) {
  .brand { min-height: 44px; }
  .footer-links { gap: 0 24px; }
  .footer-links a { display: inline-flex; align-items: center; min-height: 44px; }
  .contact-list li { align-items: center; }
  .contact-list a { display: inline-flex; align-items: center; min-height: 44px; }
  .consent { padding: 6px 0; }
  .consent input { width: 22px; height: 22px; margin-top: 0; }
}

/* Language switch (IT / EN) */
.lang-switch { display: inline-flex; align-items: center; gap: 2px; font-size: .82rem; font-weight: 600; letter-spacing: .06em; }
.lang-switch a, .lang-switch span { color: rgba(255,255,255,.55); text-decoration: none; padding: 6px 6px; border-radius: 6px; transition: color .2s, background-color .2s; }
.lang-switch a:hover { color: #fff; background: rgba(255,255,255,.08); }
.lang-switch [aria-current="true"] { color: #fff; }
.lang-switch .sep { padding: 0; color: rgba(255,255,255,.3); }
.menu .lang-switch a { border: 0; }
.nav-actions { display: flex; align-items: center; gap: 14px; }
@media (max-width: 860px) {
  .menu .lang-switch { padding: 14px 0 0; font-size: 1rem; }
  .menu .lang-switch a, .menu .lang-switch span { padding: 10px 12px; min-height: 44px; display: inline-flex; align-items: center; }
  .menu .lang-switch .sep { padding: 0; }
}