/* =========================================================
   METALKOV s.r.o. – one-page website
   Theme: Black / Gold (default)  +  Light mode
   ========================================================= */

/* ---------- Theme variables ---------- */
:root,
[data-theme="dark"] {
  --bg: #0b0b0c;
  --bg-alt: #121214;
  --surface: #18181b;
  --surface-2: #202024;
  --border: #2c2c31;
  --text: #ececec;
  --text-muted: #a3a3a8;
  --gold: #f2b705;
  --gold-2: #d99a00;
  --gold-soft: rgba(242, 183, 5, 0.12);
  --on-gold: #0b0b0c;
  --header-bg: rgba(11, 11, 12, 0.82);
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
  --hero-overlay: linear-gradient(180deg, rgba(11,11,12,.55) 0%, rgba(11,11,12,.85) 70%, #0b0b0c 100%);
  --steel-a: #1d1d21;
  --steel-b: #26262b;
}

[data-theme="light"] {
  --bg: #f7f6f2;
  --bg-alt: #edebe4;
  --surface: #ffffff;
  --surface-2: #f3f1ea;
  --border: #dedad0;
  --text: #17171a;
  --text-muted: #5c5c63;
  --gold: #c99400;
  --gold-2: #a87b00;
  --gold-soft: rgba(201, 148, 0, 0.12);
  --on-gold: #111;
  --header-bg: rgba(247, 246, 242, 0.88);
  --shadow: 0 18px 40px rgba(40, 32, 10, 0.12);
  --hero-overlay: linear-gradient(180deg, rgba(247,246,242,.35) 0%, rgba(247,246,242,.8) 70%, #f7f6f2 100%);
  --steel-a: #d9d7d0;
  --steel-b: #e8e6df;
}

/* ---------- Base ---------- */
*,
*::before,
*::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  font-family: "Barlow", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  transition: background-color .35s ease, color .35s ease;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: "Barlow Condensed", "Arial Narrow", sans-serif;
  line-height: 1.1;
  letter-spacing: .01em;
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }

.container { width: min(1180px, 100% - 40px); margin-inline: auto; }
.gold { color: var(--gold); }

.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: "Barlow Condensed", sans-serif;
  font-weight: 600; font-size: .95rem;
  text-transform: uppercase; letter-spacing: .22em;
  color: var(--gold);
  margin-bottom: 14px;
}
.eyebrow::before { content: ""; width: 28px; height: 2px; background: var(--gold); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 15px 30px;
  font-family: "Barlow Condensed", sans-serif;
  font-weight: 700; font-size: 1.05rem;
  text-transform: uppercase; letter-spacing: .08em;
  border: 2px solid transparent; border-radius: 2px;
  cursor: pointer;
  transition: transform .2s ease, background .2s ease, color .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn--gold { background: var(--gold); color: var(--on-gold); box-shadow: 0 8px 24px var(--gold-soft); }
.btn--gold:hover { background: var(--gold-2); }
.btn--ghost { border-color: var(--text); color: var(--text); }
.btn--ghost:hover { border-color: var(--gold); color: var(--gold); }
.btn--dark { background: #0b0b0c; color: #f2b705; }
.btn--dark:hover { background: #1c1c1f; }
.btn--full { width: 100%; }

/* ---------- Header ---------- */
.header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  transition: background .3s ease, box-shadow .3s ease, padding .3s ease;
  padding: 18px 0;
}
.header.scrolled {
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--border);
  padding: 10px 0;
}
.header__inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; }

.logo { display: inline-flex; align-items: center; gap: 10px; }
.logo__mark { width: 34px; height: 34px; fill: var(--gold); }
.logo__text {
  font-family: "Barlow Condensed", sans-serif;
  font-weight: 800; font-size: 1.7rem; letter-spacing: .06em;
  color: var(--text);
}
.logo__text span { color: var(--gold); }

.nav__list { display: flex; gap: 6px; list-style: none; }
.nav__link {
  position: relative; display: block;
  padding: 8px 14px;
  font-family: "Barlow Condensed", sans-serif;
  font-weight: 600; font-size: 1.05rem;
  text-transform: uppercase; letter-spacing: .1em;
  color: var(--text-muted);
  transition: color .2s ease;
}
.nav__link::after {
  content: ""; position: absolute; left: 14px; right: 14px; bottom: 2px;
  height: 2px; background: var(--gold);
  transform: scaleX(0); transform-origin: left;
  transition: transform .25s ease;
}
.nav__link:hover, .nav__link.active { color: var(--text); }
.nav__link:hover::after, .nav__link.active::after { transform: scaleX(1); }

.header__tools { display: flex; align-items: center; gap: 8px; }
.tool-btn {
  width: 42px; height: 42px;
  display: grid; place-items: center;
  background: var(--surface); color: var(--text);
  border: 1px solid var(--border); border-radius: 50%;
  cursor: pointer;
  font-family: "Barlow Condensed", sans-serif; font-weight: 700; font-size: .95rem; letter-spacing: .05em;
  transition: border-color .2s ease, color .2s ease, transform .2s ease;
}
.tool-btn:hover { border-color: var(--gold); color: var(--gold); }
.theme-btn svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; }
.theme-btn .icon-moon { fill: currentColor; stroke: none; }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }

.burger {
  display: none;
  width: 42px; height: 42px;
  background: none; border: 0; cursor: pointer;
  flex-direction: column; justify-content: center; align-items: center; gap: 5px;
}
.burger span { width: 24px; height: 2px; background: var(--text); transition: transform .3s ease, opacity .3s ease; }
.burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.open span:nth-child(2) { opacity: 0; }
.burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh; min-height: 100svh;
  display: flex; align-items: center;
  padding: 140px 0 100px;
  overflow: hidden;
}
.hero__bg {
  position: absolute; inset: 0; z-index: -1;
  background:
    var(--hero-overlay),
    radial-gradient(ellipse 60% 50% at 85% 20%, var(--gold-soft), transparent 70%),
    repeating-linear-gradient(115deg, var(--steel-a) 0 2px, var(--steel-b) 2px 5px, var(--steel-a) 5px 9px),
    var(--steel-a);
}
.hero__bg::after {
  /* Large outlined I-beam silhouette */
  content: "";
  position: absolute; right: -6%; top: 50%;
  width: min(620px, 60vw); aspect-ratio: 1;
  transform: translateY(-50%) rotate(-12deg);
  background: var(--gold);
  opacity: .07;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3Cpath d='M4 5h32v7H24v16h12v7H4v-7h12V12H4z'/%3E%3C/svg%3E") center / contain no-repeat;
          mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3Cpath d='M4 5h32v7H24v16h12v7H4v-7h12V12H4z'/%3E%3C/svg%3E") center / contain no-repeat;
}
.hero__content { max-width: 760px; margin-left: max(20px, calc((100% - 1180px) / 2)); }
.hero__title {
  font-size: clamp(3rem, 8vw, 6.2rem);
  font-weight: 800; text-transform: uppercase;
  margin-bottom: 24px;
}
.hero__lead { font-size: 1.2rem; color: var(--text-muted); max-width: 600px; margin-bottom: 38px; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; }

.hero__scroll {
  position: absolute; bottom: 34px; left: 50%; transform: translateX(-50%);
  width: 26px; height: 42px;
  border: 2px solid var(--text-muted); border-radius: 14px;
}
.hero__scroll span {
  position: absolute; left: 50%; top: 8px; width: 4px; height: 8px;
  margin-left: -2px; border-radius: 2px; background: var(--gold);
  animation: scroll 1.8s infinite;
}
@keyframes scroll { 0% { opacity: 1; transform: translateY(0); } 80% { opacity: 0; transform: translateY(14px); } 100% { opacity: 0; } }

/* ---------- Strip ---------- */
.strip { background: var(--gold); color: var(--on-gold); }
.strip__inner { display: grid; grid-template-columns: repeat(4, 1fr); }
.strip__item {
  padding: 28px 20px; text-align: center;
  border-right: 1px solid rgba(0,0,0,.15);
}
.strip__item:last-child { border-right: 0; }
.strip__item strong {
  display: block;
  font-family: "Barlow Condensed", sans-serif; font-weight: 800;
  font-size: 1.9rem; text-transform: uppercase; line-height: 1.1;
}
.strip__item span { font-size: .95rem; font-weight: 500; opacity: .8; }

/* ---------- Sections ---------- */
.section { padding: 110px 0; }
.section--alt { background: var(--bg-alt); }
.section__head { max-width: 680px; margin-bottom: 56px; }
.section__title { font-size: clamp(2.3rem, 5vw, 3.4rem); font-weight: 800; text-transform: uppercase; margin-bottom: 14px; }
.section__lead { color: var(--text-muted); font-size: 1.1rem; }

/* ---------- About ---------- */
.about { display: grid; grid-template-columns: 1.1fr 1fr; gap: 70px; align-items: center; }
.about__text p { color: var(--text-muted); margin-bottom: 18px; }
.checklist { list-style: none; margin-top: 26px; display: grid; gap: 12px; }
.checklist li { position: relative; padding-left: 34px; font-weight: 500; }
.checklist li::before {
  content: ""; position: absolute; left: 0; top: 4px;
  width: 20px; height: 20px; border-radius: 2px;
  background: var(--gold) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M9 16.2l-3.5-3.5L4 14.2l5 5 11-11-1.5-1.5z' fill='%23111'/%3E%3C/svg%3E") center / 16px no-repeat;
}

.about__visual {
  position: relative; aspect-ratio: 1 / 1;
  background: var(--surface); border: 1px solid var(--border);
  display: grid; place-items: center; overflow: hidden;
}
.about__visual::before {
  content: ""; position: absolute; inset: 0;
  background: repeating-linear-gradient(45deg, transparent 0 22px, var(--gold-soft) 22px 24px);
}
.beam-stack { position: relative; width: 70%; display: grid; gap: 18px; transform: rotate(-8deg); }
.beam {
  height: 54px; border-radius: 2px;
  background: linear-gradient(180deg, #5a5a60 0%, #c9c9cf 18%, #8a8a90 40%, #4b4b50 60%, #9b9ba1 85%, #3d3d42 100%);
  box-shadow: var(--shadow);
}
.beam--1 { width: 100%; }
.beam--2 { width: 82%; margin-left: 12%; background: linear-gradient(180deg, #8a6200 0%, #ffd34d 20%, #f2b705 45%, #a67700 70%, #e0a800 100%); }
.beam--3 { width: 92%; }
.about__badge {
  position: absolute; left: 24px; bottom: 24px;
  background: var(--gold); color: var(--on-gold);
  padding: 16px 22px; border-radius: 2px;
}
.about__badge strong { display: block; font-family: "Barlow Condensed", sans-serif; font-size: 2.6rem; font-weight: 800; line-height: 1; }
.about__badge span { font-weight: 600; font-size: .9rem; text-transform: uppercase; letter-spacing: .08em; }

/* ---------- Product cards ---------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.card {
  position: relative;
  background: var(--surface); border: 1px solid var(--border);
  padding: 36px 32px; border-radius: 2px;
  transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
  overflow: hidden;
}
.card::after {
  content: ""; position: absolute; left: 0; top: 0; width: 100%; height: 3px;
  background: var(--gold); transform: scaleX(0); transform-origin: left;
  transition: transform .35s ease;
}
.card:hover { transform: translateY(-6px); border-color: var(--gold); box-shadow: var(--shadow); }
.card:hover::after { transform: scaleX(1); }
.card__icon {
  width: 64px; height: 64px; margin-bottom: 22px;
  display: grid; place-items: center;
  background: var(--gold-soft); border-radius: 2px;
}
.card__icon svg { width: 36px; height: 36px; fill: var(--gold); }
.card h3 { font-size: 1.6rem; text-transform: uppercase; margin-bottom: 10px; }
.card p { color: var(--text-muted); font-size: 1rem; }

/* ---------- Services ---------- */
.services { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-top: 1px solid var(--border); }
.service { padding: 40px 28px 10px 0; border-right: 1px solid var(--border); padding-left: 28px; }
.service:first-child { padding-left: 0; }
.service:last-child { border-right: 0; }
.service__num {
  display: block;
  font-family: "Barlow Condensed", sans-serif; font-weight: 800; font-size: 3.2rem;
  color: transparent; -webkit-text-stroke: 1.5px var(--gold);
  line-height: 1; margin-bottom: 16px;
}
.service h3 { font-size: 1.5rem; text-transform: uppercase; margin-bottom: 10px; }
.service p { color: var(--text-muted); font-size: 1rem; }

/* ---------- CTA ---------- */
.cta {
  background:
    repeating-linear-gradient(115deg, rgba(0,0,0,.05) 0 2px, transparent 2px 6px),
    linear-gradient(120deg, #f2b705, #d99a00);
  color: #0b0b0c; text-align: center;
  padding: 80px 0;
}
.cta h2 { font-size: clamp(2rem, 4.5vw, 3rem); font-weight: 800; text-transform: uppercase; margin-bottom: 12px; }
.cta p { font-size: 1.15rem; margin-bottom: 30px; opacity: .85; }

/* ---------- Contact ---------- */
.contact { display: grid; grid-template-columns: 1fr 1.25fr; gap: 50px; align-items: start; }
.contact__info { display: grid; gap: 26px; }
.info-row { display: flex; gap: 18px; align-items: flex-start; }
.info-row__icon {
  flex: none; width: 50px; height: 50px; display: grid; place-items: center;
  background: var(--gold); border-radius: 2px;
}
.info-row__icon svg { width: 24px; height: 24px; fill: var(--on-gold); }
.info-row h4 { font-size: 1.15rem; text-transform: uppercase; letter-spacing: .06em; margin-bottom: 2px; }
.info-row p { color: var(--text-muted); }
.info-row a:hover { color: var(--gold); }
.company-data {
  display: flex; flex-wrap: wrap; gap: 6px 18px;
  padding-top: 20px; border-top: 1px solid var(--border);
  color: var(--text-muted); font-size: .92rem;
}

.form {
  background: var(--surface); border: 1px solid var(--border);
  padding: 38px; border-radius: 2px;
  display: grid; gap: 18px;
}
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form label { display: grid; gap: 6px; }
.form label span {
  font-family: "Barlow Condensed", sans-serif; font-weight: 600;
  text-transform: uppercase; letter-spacing: .08em; font-size: .9rem;
  color: var(--text-muted);
}
.form input, .form textarea {
  width: 100%; padding: 13px 14px;
  font: inherit; font-size: 1rem; color: var(--text);
  background: var(--bg); border: 1px solid var(--border); border-radius: 2px;
  transition: border-color .2s ease, box-shadow .2s ease;
  resize: vertical;
}
.form input:focus, .form textarea:focus { outline: none; border-color: var(--gold); box-shadow: 0 0 0 3px var(--gold-soft); }
.form .invalid { border-color: #e5484d; }
.form__note { min-height: 1.4em; font-size: .95rem; color: var(--gold); text-align: center; }

.map { margin-top: 50px; border: 1px solid var(--border); border-radius: 2px; overflow: hidden; height: 380px; }
.map iframe { width: 100%; height: 100%; border: 0; display: block; }
[data-theme="dark"] .map iframe { filter: grayscale(.9) invert(.92) contrast(.9) hue-rotate(180deg); }

/* ---------- Footer ---------- */
.footer { background: #070708; color: #a3a3a8; padding: 50px 0 40px; border-top: 3px solid #f2b705; }
.footer__inner { display: grid; justify-items: center; gap: 12px; text-align: center; }
.logo--footer .logo__text { color: #ececec; }
.logo--footer .logo__mark { fill: #f2b705; }
.footer__copy { font-size: .9rem; opacity: .7; }

/* ---------- Back to top ---------- */
.to-top {
  position: fixed; right: 22px; bottom: 22px; z-index: 90;
  width: 48px; height: 48px; display: grid; place-items: center;
  background: var(--gold); border-radius: 2px;
  box-shadow: var(--shadow);
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: opacity .3s ease, transform .3s ease, visibility .3s;
}
.to-top svg { width: 26px; height: 26px; fill: var(--on-gold); }
.to-top.show { opacity: 1; visibility: visible; transform: none; }

/* ---------- Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }
.no-js .reveal { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .services { grid-template-columns: repeat(2, 1fr); }
  .service { padding: 34px 24px 24px 0 !important; border-right: 0; border-bottom: 1px solid var(--border); }
  .about { gap: 48px; }
}

@media (max-width: 860px) {
  .burger { display: flex; }
  .nav {
    position: fixed; inset: 0 0 0 auto; width: min(320px, 82vw);
    background: var(--surface); border-left: 1px solid var(--border);
    padding: 100px 28px 28px;
    transform: translateX(100%); transition: transform .35s ease;
    box-shadow: var(--shadow);
  }
  .nav.open { transform: none; }
  .nav__list { flex-direction: column; gap: 4px; }
  .nav__link { font-size: 1.4rem; padding: 12px 0; }
  .nav__link::after { left: 0; right: auto; width: 40px; }
  .header__tools { position: relative; z-index: 2; }

  .about, .contact { grid-template-columns: 1fr; }
  .about__visual { max-width: 480px; }
  .strip__inner { grid-template-columns: repeat(2, 1fr); }
  .strip__item:nth-child(2) { border-right: 0; }
  .strip__item:nth-child(-n+2) { border-bottom: 1px solid rgba(0,0,0,.15); }
}

@media (max-width: 600px) {
  body { font-size: 16px; }
  .section { padding: 80px 0; }
  .cards, .services, .form__row { grid-template-columns: 1fr; }
  .form { padding: 26px 20px; }
  .hero__actions .btn { width: 100%; }
  .logo__text { font-size: 1.45rem; }
  .map { height: 300px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- Company logo (image) ---------- */
.logo__img { height: 52px; width: auto; transition: height .3s ease; }
.header.scrolled .logo__img { height: 44px; }
[data-theme="dark"] .logo__img--light,
[data-theme="light"] .logo__img--dark { display: none; }
.logo--footer .logo__img { height: 60px; }
@media (max-width: 600px) { .logo__img, .header.scrolled .logo__img { height: 40px; } }

/* ---------- Form extras ---------- */
.hp { position: absolute !important; left: -9999px !important; width: 1px; height: 1px; opacity: 0; }
.form { position: relative; }
.form__note.error { color: #e5484d; }
.btn:disabled { opacity: .6; cursor: wait; transform: none; }