/* ==========================================================================
   Leachem (Leading Chemicals s.r.o.) — design systém
   Identita: navy #1B3B5A + bílá + citronově-oranžový akcent.
   Bez frameworků. Barvy v OKLCH, neutrály tónované do modré.
   ========================================================================== */

:root {
  /* --- Barvy (committed strategy: navy nese velké plochy) --- */
  --navy:        oklch(0.355 0.058 249);   /* #1B3B5A — brand */
  --navy-deep:   oklch(0.285 0.050 250);
  --navy-ink:    oklch(0.225 0.040 251);
  --navy-soft:   oklch(0.955 0.014 245);   /* pale modrý podklad */
  --accent:      oklch(0.720 0.150 58);    /* citronově-oranžová (Universal Lemon) */
  --accent-deep: oklch(0.640 0.150 52);
  --paper:       oklch(0.992 0.003 240);
  --paper-2:     oklch(0.966 0.007 242);
  --ink:         oklch(0.245 0.022 250);
  --ink-soft:    oklch(0.470 0.024 250);
  --line:        oklch(0.884 0.012 245);
  --on-navy:     oklch(0.978 0.006 240);
  --on-navy-soft: oklch(0.845 0.028 240);

  /* --- Písma --- */
  --display: 'Space Grotesk', system-ui, sans-serif;
  --body:    'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --sans:    'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;

  /* --- Rozměry --- */
  --maxw: 1240px;
  --gutter: clamp(1.25rem, 4vw, 3.5rem);
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

body {
  margin: 0;
  font-family: var(--body);
  font-size: clamp(1.05rem, 0.4vw + 1rem, 1.2rem);
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 { font-family: var(--display); font-weight: 500; margin: 0; line-height: 1.08; letter-spacing: -0.01em; }
p { margin: 0 0 1em; }
a { color: inherit; }
img, svg { display: block; max-width: 100%; }

.wrap { max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }

/* Odskok kotev pod lepkavou hlavičku */
section[id] { scroll-margin-top: 7.5rem; }

/* Prostrkaný mikro-label (sans) */
.eyebrow {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--accent-deep);
  margin: 0 0 1.4rem;
}
.eyebrow--onNavy { color: var(--accent); }

/* Verzálkový serif nadpis */
.display {
  text-transform: uppercase;
  letter-spacing: 0.015em;
  font-weight: 400;
}

/* Tlačítka */
.btn {
  display: inline-flex; align-items: center; gap: 0.6ch;
  font-family: var(--sans); font-size: 0.78rem; font-weight: 600;
  letter-spacing: 0.16em; text-transform: uppercase; text-decoration: none;
  padding: 0.95rem 1.7rem; border-radius: 999px;
  background: var(--navy); color: var(--on-navy);
  border: 1px solid var(--navy);
  transition: background .5s var(--ease), color .5s var(--ease), transform .5s var(--ease);
}
.btn:hover { background: var(--navy-deep); border-color: var(--navy-deep); transform: translateY(-2px); }
.btn--ghost { background: transparent; color: var(--navy); }
.btn--ghost:hover { background: var(--navy); color: var(--on-navy); }
.btn--onNavy { background: var(--on-navy); color: var(--navy-deep); border-color: var(--on-navy); }
.btn--onNavy:hover { background: transparent; color: var(--on-navy); transform: translateY(-2px); }

/* Textový odkaz "EXPLORE →" */
.link-more {
  font-family: var(--sans); font-size: 0.74rem; font-weight: 600;
  letter-spacing: 0.16em; text-transform: uppercase; text-decoration: none;
  color: var(--accent-deep); display: inline-flex; align-items: center; gap: 0.7ch;
  padding-bottom: 0.4rem; border-bottom: 1px solid currentColor;
}
.link-more .arw { transition: transform .5s var(--ease); }
.link-more:hover .arw { transform: translateX(6px); }

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in oklch, var(--paper) 88%, transparent);
  backdrop-filter: saturate(1.1) blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-top {
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center;
  padding-block: 1.15rem;
}
.header-social { display: flex; gap: 1rem; }
.header-social a { color: var(--ink-soft); transition: color .4s var(--ease); }
.header-social a:hover { color: var(--navy); }
.header-cta { justify-self: end; }

.brand { justify-self: center; display: inline-flex; align-items: baseline; text-decoration: none; }
.brand-name {
  font-family: var(--sans); font-size: 1.6rem;
  letter-spacing: 0.18em; text-transform: uppercase; color: var(--navy); line-height: 1;
  padding-left: 0.18em;
}
.brand-name .lea  { font-weight: 300; }
.brand-name .chem { font-weight: 700; }
.site-footer .brand-name { color: var(--on-navy); }
.site-footer .brand-name .lea { color: var(--on-navy-soft); }

.site-nav ul {
  list-style: none; margin: 0; padding: 0 0 0.9rem;
  display: flex; flex-wrap: wrap; justify-content: center; gap: 0.5rem 2.2rem;
}
.site-nav a {
  font-family: var(--sans); font-size: 0.76rem; font-weight: 500;
  letter-spacing: 0.14em; text-transform: uppercase; text-decoration: none;
  color: var(--ink-soft); transition: color .4s var(--ease);
}
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--navy); }
.lang a {
  color: var(--navy); font-weight: 700;
  border: 1px solid var(--line); border-radius: 999px; padding: 0.15rem 0.7rem;
}

.nav-toggle { display: none; }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero { padding-top: clamp(3rem, 8vw, 6.5rem); text-align: center; }
.hero .wrap { max-width: 1080px; }
.hero h1 {
  font-size: clamp(2.4rem, 5.4vw, 4.4rem);
  text-transform: uppercase; letter-spacing: -0.005em; font-weight: 500;
  margin: 0 auto 1.6rem; max-width: 20ch;
}
.hero .lead {
  font-size: clamp(1.15rem, 1.4vw + 0.9rem, 1.5rem);
  color: var(--ink-soft); max-width: 54ch; margin: 0 auto 2.4rem;
}

/* Hero foto pás (granulát) */
.hero-photo {
  margin-top: clamp(2.5rem, 6vw, 5rem);
  width: 100%; height: clamp(240px, 34vw, 480px);
  object-fit: cover; object-position: center; display: block;
}

/* ==========================================================================
   Sekce / pásy
   ========================================================================== */
.band { padding-block: clamp(4.5rem, 11vw, 9rem); }
.band--tint { background: var(--paper-2); }
.band--navy { background: var(--navy); color: var(--on-navy); }
.band--navy .eyebrow { color: var(--on-navy-soft); }
.band--dark { background: var(--navy-ink); color: var(--on-navy); }

.section-head { max-width: 62ch; }
.section-head h2 { font-size: clamp(2rem, 4.4vw, 3.6rem); text-transform: uppercase; letter-spacing: 0.015em; }
.band--navy .section-head h2 { color: var(--on-navy); }
.section-head p { margin-top: 1.4rem; color: var(--ink-soft); max-width: 58ch; }
.band--navy .section-head p { color: var(--on-navy-soft); }

/* Statement (velký serif odstavec) */
.statement {
  font-size: clamp(1.6rem, 3.6vw, 3rem);
  line-height: 1.22; font-weight: 300; max-width: 22ch;
}
.statement em { font-style: italic; color: var(--navy); }
.band--navy .statement em { color: var(--on-navy); }

/* Mission / Vision — dvousloupec */
.split { display: grid; gap: clamp(2rem, 5vw, 5rem); grid-template-columns: 1fr 1fr; align-items: center; }
.split + .split { margin-top: clamp(3rem, 7vw, 6rem); }
.split--flip .fig { order: 2; }
.fig { aspect-ratio: 4 / 3; border-radius: 4px; overflow: hidden; background: var(--navy-soft); }
.fig img { width: 100%; height: 100%; object-fit: cover; }
.split h3 { font-size: clamp(1.7rem, 3vw, 2.6rem); text-transform: uppercase; letter-spacing: 0.02em; margin-bottom: 1rem; }
.split .kicker {
  font-family: var(--sans); font-size: 0.72rem; font-weight: 600;
  letter-spacing: 0.24em; text-transform: uppercase; color: var(--navy); margin-bottom: 1rem;
}

/* Produkty — editoriální řádky */
.products { margin-top: clamp(2.5rem, 6vw, 4.5rem); border-top: 1px solid color-mix(in oklch, var(--on-navy) 30%, transparent); }
.product-row {
  display: grid; grid-template-columns: auto 1fr auto; gap: clamp(1rem, 4vw, 3rem);
  align-items: baseline; padding-block: clamp(1.4rem, 3vw, 2.4rem);
  border-bottom: 1px solid color-mix(in oklch, var(--on-navy) 30%, transparent);
}
.product-row .num { font-family: var(--sans); font-size: 0.78rem; letter-spacing: 0.1em; color: var(--on-navy-soft); }
.product-row .name { font-family: var(--display); font-size: clamp(1.8rem, 4.5vw, 3.4rem); text-transform: uppercase; letter-spacing: 0.02em; color: var(--on-navy); }
.product-row .desc { font-size: 1.05rem; color: var(--on-navy-soft); max-width: 34ch; justify-self: end; text-align: right; }

/* Why choose — číslované body */
.reasons { margin-top: clamp(2.5rem, 6vw, 4rem); display: grid; gap: clamp(1.5rem, 3vw, 2.5rem); grid-template-columns: repeat(4, 1fr); }
.reason .r-num { font-family: var(--display); font-size: 2.6rem; color: var(--accent); line-height: 1; margin-bottom: 0.8rem; }
.reason h3 { font-size: 1.35rem; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 0.6rem; }
.reason p { color: var(--ink-soft); font-size: 1rem; margin: 0; }
.reason .r-text { color: var(--ink); font-size: 1.05rem; margin: 0; }

/* Checklist (Proč spolupracovat) */
.checklist {
  margin-top: clamp(2rem, 5vw, 3.5rem); list-style: none; padding: 0;
  display: grid; grid-template-columns: 1fr 1fr; gap: 0.3rem 3rem;
}
.checklist li {
  display: flex; gap: 0.9rem; align-items: flex-start;
  font-size: 1.08rem; color: var(--ink); padding: 0.7rem 0;
  border-bottom: 1px solid var(--line);
}
.checklist li svg { flex: none; width: 22px; height: 22px; color: var(--accent); margin-top: 2px; }

/* Centrovaná hlavička sekce (Fortrade styl) */
.section-head--center { margin-inline: auto; text-align: center; }
.section-head--center p { margin-inline: auto; }

/* Sektory — horizontální galerie */
.sectors-head { display: flex; align-items: center; justify-content: space-between; gap: 2rem; flex-wrap: wrap; }
.sectors-aside { display: flex; flex-direction: column; align-items: flex-end; gap: 1.2rem; max-width: 34ch; }
.sectors-aside p { color: var(--ink-soft); margin: 0; text-align: right; }
.sector-nav { display: flex; gap: 0.6rem; }
.sector-nav button {
  width: 46px; height: 46px; border-radius: 999px; border: 1px solid var(--line);
  background: transparent; color: var(--navy); cursor: pointer; display: grid; place-items: center;
  transition: background .4s var(--ease), color .4s var(--ease), border-color .4s var(--ease);
}
.sector-nav button:hover { background: var(--navy); color: var(--on-navy); border-color: var(--navy); }
.sector-nav button svg { width: 18px; height: 18px; }
.sector-track {
  margin-top: clamp(2rem, 5vw, 3.5rem);
  display: grid; grid-auto-flow: column; grid-auto-columns: min(78vw, 360px);
  gap: clamp(1rem, 2.5vw, 1.75rem); overflow-x: auto; scroll-snap-type: x mandatory;
  padding-bottom: 1.5rem; scrollbar-width: thin;
}
.sector { scroll-snap-align: start; }
.sector .art {
  aspect-ratio: 4 / 5; border-radius: 4px; overflow: hidden;
  background: var(--navy-soft); margin-bottom: 1.4rem;
}
.sector .art img { width: 100%; height: 100%; object-fit: cover; transition: transform .9s var(--ease); }
.sector:hover .art img { transform: scale(1.05); }
.sector h3 { font-size: 1.6rem; text-transform: uppercase; letter-spacing: -0.005em; margin-bottom: 0.5rem; }
.sector p { color: var(--ink-soft); font-size: 1rem; margin-bottom: 1.1rem; }

/* Sortiment — PE / PP na navy */
.range-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 5vw, 4.5rem); margin-top: clamp(2.5rem, 6vw, 4rem); }
.range h3 { font-size: clamp(2rem, 4.5vw, 3.2rem); text-transform: uppercase; letter-spacing: 0.03em; color: var(--on-navy); margin-bottom: 0.2rem; }
.range h3 .abbr { color: var(--accent); }
.range .range-lead { color: var(--on-navy-soft); font-size: 1.05rem; margin: 0 0 1.4rem; }
.range .apps { list-style: none; margin: 0 0 1.6rem; padding: 0; columns: 2; column-gap: 1.5rem; }
.range .apps li { font-size: 1rem; color: var(--on-navy-soft); padding: 0.2rem 0; break-inside: avoid; }
.range .apps li::before { content: "—"; color: var(--accent); margin-right: 0.6ch; }
.chips-label { font-family: var(--sans); font-size: 0.68rem; font-weight: 600; letter-spacing: 0.2em; text-transform: uppercase; color: var(--on-navy-soft); margin-bottom: 0.7rem; }
.chips { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.chip {
  font-family: var(--sans); font-size: 0.72rem; letter-spacing: 0.06em;
  color: var(--on-navy); border: 1px solid color-mix(in oklch, var(--on-navy) 32%, transparent);
  border-radius: 999px; padding: 0.35rem 0.85rem;
}

/* Co obchodujeme — materiálové tagy */
.tags { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-top: clamp(2rem, 5vw, 3rem); }
.tag {
  font-family: var(--sans); font-size: 0.82rem; letter-spacing: 0.06em;
  color: var(--navy); background: var(--navy-soft); border-radius: 999px; padding: 0.55rem 1.15rem;
}

/* Global reach — marquee */
.reach { text-align: center; }
.marquee { overflow: hidden; margin-top: 2.5rem; -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent); mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent); }
.marquee-track { display: inline-flex; white-space: nowrap; will-change: transform; animation: marquee 38s linear infinite; }
.marquee:hover .marquee-track { animation-play-state: paused; }
.marquee-track span {
  font-family: var(--display); font-size: clamp(2rem, 5vw, 4rem);
  text-transform: uppercase; letter-spacing: 0.04em; color: var(--ink);
  padding-inline: 1.4rem;
}
.marquee-track .dot { color: var(--navy); }
@keyframes marquee { to { transform: translateX(-50%); } }

/* Celoplošný foto pás (logistika / dosah) */
.mediaband {
  position: relative; min-height: clamp(360px, 48vw, 560px);
  display: grid; place-items: center; text-align: center; overflow: hidden; color: var(--on-navy);
}
.mediaband img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.mediaband::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(to bottom,
    color-mix(in oklch, var(--navy-ink) 52%, transparent),
    color-mix(in oklch, var(--navy-ink) 80%, transparent));
}
.mediaband .wrap { position: relative; z-index: 1; padding-block: clamp(3rem, 7vw, 5rem); }
.mediaband h2 { color: var(--on-navy); font-size: clamp(2rem, 5vw, 3.6rem); text-transform: uppercase; letter-spacing: -0.005em; }
.mediaband p { color: var(--on-navy-soft); max-width: 46ch; margin: 1.2rem auto 0; }
.mediaband .chips { justify-content: center; margin-top: 1.8rem; }

/* Kontakt */
.contact { display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(2rem, 6vw, 5rem); align-items: start; }
.contact h2 { font-size: clamp(2.4rem, 6vw, 4.5rem); text-transform: uppercase; letter-spacing: 0.015em; }
.contact .lead { color: var(--on-navy-soft); max-width: 42ch; margin-top: 1.4rem; }
.contact-details { display: grid; gap: 1.6rem; font-size: 1.1rem; }
.contact-details a { color: var(--on-navy); text-decoration: none; border-bottom: 1px solid color-mix(in oklch, var(--on-navy) 40%, transparent); padding-bottom: 2px; }
.contact-details .cd-label { font-family: var(--sans); font-size: 0.7rem; font-weight: 600; letter-spacing: 0.22em; text-transform: uppercase; color: var(--on-navy-soft); display: block; margin-bottom: 0.35rem; }

/* Footer */
.site-footer { background: var(--navy-ink); color: var(--on-navy-soft); padding-block: clamp(3rem, 6vw, 4.5rem); }
.footer-grid { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 2rem; align-items: center; }
.site-footer .brand-name { color: var(--on-navy); }
.footer-nav { display: flex; gap: 1.8rem; flex-wrap: wrap; }
.site-footer a { color: var(--on-navy-soft); text-decoration: none; font-family: var(--sans); font-size: 0.78rem; letter-spacing: 0.12em; text-transform: uppercase; transition: color .4s var(--ease); }
.site-footer a:hover { color: var(--on-navy); }
.footer-legal { margin-top: 2.5rem; font-family: var(--sans); font-size: 0.74rem; letter-spacing: 0.04em; color: color-mix(in oklch, var(--on-navy-soft) 70%, transparent); }

/* ==========================================================================
   Reveal on scroll
   ========================================================================== */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 1s var(--ease), transform 1s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 900px) {
  .split, .contact, .range-grid, .checklist { grid-template-columns: 1fr; }
  .split--flip .fig { order: 0; }
  .reasons { grid-template-columns: repeat(2, 1fr); }
  .product-row { grid-template-columns: auto 1fr; }
  .product-row .desc { grid-column: 1 / -1; justify-self: start; text-align: left; }
}

@media (max-width: 720px) {
  /* Hamburger do horní řady (vlevo), logo uprostřed, CTA vpravo */
  .site-header .wrap { position: relative; }
  .header-top { grid-template-columns: 1fr auto 1fr; }
  .header-social { visibility: hidden; }
  .nav-toggle {
    display: inline-flex; align-items: center; justify-content: center;
    position: absolute; top: 1.15rem; right: var(--gutter);
    background: none; border: 0; cursor: pointer;
    font-size: 1.5rem; color: var(--ink); padding: 0.35rem; line-height: 1;
  }
  .site-nav { position: static; }
  .site-nav ul {
    display: none; flex-direction: column; align-items: center; gap: 1.25rem;
    padding: 0.25rem 0 1.5rem;
  }
  .site-nav.is-open ul { display: flex; }
  .header-cta { display: none; }
  .brand-name { font-size: 1.5rem; }

  /* Galerie aplikací — vlevo zarovnaný intro + šipky */
  .sectors-aside { align-items: flex-start; max-width: none; }
  .sectors-aside p { text-align: left; }
}

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { transition: none; opacity: 1; transform: none; }
  .marquee-track { animation: none; }
  * { transition-duration: 0.001ms !important; }
}