/*
 * Foundation layout styles. Colors come only from theme tokens so a
 * later hexagonal theme transition can swap the document theme without
 * rewriting components.
 */

html {
  background-color: var(--color-background);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-background);
  color: var(--color-text);
  font-family: "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  line-height: 1.5;
  overflow-x: hidden;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.site-container {
  width: min(72rem, calc(100% - 2rem));
  margin-inline: auto;
}

.site-header,
.site-footer {
  background-color: var(--color-surface);
  border-color: var(--color-border);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid var(--color-border);
}

/* Keep sticky-header nav anchors from landing under the header. */
#kategorie,
#domy,
#komercni,
#ocelove-haly,
#technologie,
#reference,
#proces,
#proc-rokoio,
#kontakt,
#projekty-domu {
  scroll-margin-top: 5.5rem;
}

.site-header__inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.75rem 1.25rem;
  padding-block: 0.85rem;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  color: inherit;
  text-decoration: none;
  min-width: 0;
  flex-shrink: 0;
}

.site-logo:hover .brand-lockup__letter--accent {
  filter: brightness(1.08);
}

.site-header__tools {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  justify-self: end;
}

.nav-toggle {
  display: none;
  appearance: none;
  margin: 0;
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--color-border);
  background-color: var(--color-surface-elevated);
  color: var(--color-text);
  font: inherit;
  font-size: 0.875rem;
  cursor: pointer;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.15rem;
}

.lang-switch__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.25rem;
  min-height: 2.25rem;
  padding: 0.25rem 0.45rem;
  color: var(--color-text-muted);
  font-size: 0.8125rem;
  font-weight: 650;
  letter-spacing: 0.04em;
  text-decoration: none;
}

.lang-switch__link:hover,
.lang-switch__link--active {
  color: var(--color-accent);
}

.lang-switch__link--active {
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -100px;
  z-index: 100;
  padding: 0.65rem 1rem;
  background: var(--color-surface-elevated);
  color: var(--color-text);
  text-decoration: none;
}

.skip-link:focus {
  top: 1rem;
}

.site-flash {
  padding-block: 1rem 0;
}

.site-flash__notice,
.site-flash__alert {
  margin: 0 0 0.75rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
}

.site-flash__alert {
  border-color: var(--color-accent);
}

.site-nav {
  min-width: 0;
}

.site-nav__list {
  display: flex;
  flex-wrap: nowrap;
  gap: 0.15rem 0.85rem;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.site-nav__link {
  display: inline-block;
  padding-block: 0.35rem;
  color: var(--color-text-muted);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
}

.site-nav__link:hover {
  color: var(--color-accent);
}

.theme-toggle {
  appearance: none;
  margin: 0;
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background-color: var(--color-surface-elevated);
  color: var(--color-text);
  font: inherit;
  font-size: 0.875rem;
  cursor: pointer;
  white-space: nowrap;
}

.theme-toggle:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.site-main {
  flex: 1 0 auto;
  padding-block: 0 0;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.site-footer__inner {
  display: grid;
  gap: 1.75rem;
  padding-block: 2.25rem;
}

.site-footer__ico,
.site-footer__phones,
.site-footer__legal-name {
  margin: 0.55rem 0 0;
}

.site-footer__label {
  margin: 0 0 0.4rem;
  color: var(--color-text);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-footer address {
  font-style: normal;
}

.site-footer address span {
  display: block;
}

.site-footer__nav ul {
  display: grid;
  gap: 0.35rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-footer a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--color-accent);
}

.phone-link {
  display: block;
  color: inherit;
  text-decoration: none;
  word-break: keep-all;
}

.phone-link + .phone-link {
  margin-top: 0.25rem;
}

.phone-link:hover {
  color: var(--color-accent);
}

/* Shared section / UI primitives */

.section-heading {
  margin: 0;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 650;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.section-lead {
  margin: 0.85rem 0 0;
  max-width: 38rem;
  color: var(--color-text-muted);
  font-size: 1.0625rem;
}

.section-intro {
  margin-bottom: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.65rem 1.25rem;
  border: 1px solid transparent;
  font: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  text-decoration: none;
  cursor: pointer;
}

.button--primary {
  background-color: var(--color-accent);
  color: var(--color-accent-contrast);
}

.button--primary:hover {
  filter: brightness(1.05);
}

.button--secondary {
  border-color: var(--color-border);
  background-color: transparent;
  color: var(--color-text);
}

.button--secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.text-link {
  color: var(--color-accent);
  font-weight: 600;
  text-decoration: none;
}

.text-link:hover {
  text-decoration: underline;
}

/* Hero */

.hero {
  padding-block: 2.5rem 3rem;
}

.hero__grid {
  display: grid;
  gap: 2rem;
  align-items: end;
}

.hero__eyebrow {
  margin: 0 0 0.75rem;
  color: var(--color-accent);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero__title {
  margin: 0;
  font-size: clamp(2.4rem, 8vw, 4.75rem);
  font-weight: 650;
  letter-spacing: 0.02em;
  line-height: 0.95;
}

.hero__proposition {
  margin: 1.25rem 0 0;
  max-width: 28rem;
  font-size: clamp(1.25rem, 2.8vw, 1.65rem);
  font-weight: 550;
  line-height: 1.25;
}

.hero__support {
  margin: 0.85rem 0 0;
  max-width: 32rem;
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.hero__media {
  margin: 0;
  overflow: hidden;
  background-color: var(--color-surface);
}

.hero__image {
  display: block;
  width: 100%;
  height: clamp(18rem, 58vw, 34rem);
  object-fit: cover;
  object-position: center 40%;
}

/* Metrics */

.metrics {
  border-block: 1px solid var(--color-border);
  background-color: var(--color-surface);
  padding-block: 1.75rem;
}

.metrics__list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.metrics__item {
  display: grid;
  gap: 0.25rem;
}

.metrics__value {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 650;
  letter-spacing: -0.02em;
  line-height: 1;
}

.metrics__label {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* Categories */

.categories {
  padding-block: 4rem 2rem;
}

.categories__stack {
  display: grid;
  gap: 3rem;
}

.category {
  display: grid;
  gap: 1.25rem;
}

.category__media {
  margin: 0;
  overflow: hidden;
  background-color: var(--color-surface);
}

.category__image {
  display: block;
  width: 100%;
  height: clamp(16rem, 48vw, 28rem);
  object-fit: cover;
}

.category--residential .category__image {
  object-position: center 45%;
}

.category--commercial .category__image {
  object-position: center 35%;
}

.category--steel .category__image {
  object-position: center center;
}

.category__meta {
  margin: 0 0 0.4rem;
  color: var(--color-accent);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.category__title {
  margin: 0;
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.2;
}

.category__description {
  margin: 0.65rem 0 0;
  max-width: 34rem;
  color: var(--color-text-muted);
}

.category__cta {
  margin: 1rem 0 0;
}

/* Technology */

.technology {
  padding-block: 4rem;
}

.tech-list {
  display: grid;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--color-border);
}

.tech-list__item {
  display: grid;
  gap: 0.35rem;
  padding-block: 1.35rem;
  border-bottom: 1px solid var(--color-border);
}

.tech-list__title {
  margin: 0;
  font-size: 1.25rem;
}

.tech-list__description {
  margin: 0;
  color: var(--color-text-muted);
}

.technology__cta,
.references__cta,
.process__cta,
.why__cta {
  margin: 1.75rem 0 0;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Why ROKOIO */

.why {
  padding-block: 4rem;
  background-color: var(--color-surface);
}

.why__grid {
  display: grid;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.why__item {
  padding-block: 0.25rem;
}

.why__title {
  margin: 0;
  font-size: 1.2rem;
}

.why__description {
  margin: 0.4rem 0 0;
  color: var(--color-text-muted);
}

.why__chain {
  margin-top: 2.5rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--color-border);
}

.why__chain-label {
  margin: 0 0 1rem;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.why__chain-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.35rem;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.why__chain-list li {
  position: relative;
  padding-right: 1.35rem;
  color: var(--color-text);
  font-weight: 550;
}

.why__chain-list li:not(:last-child)::after {
  content: "→";
  position: absolute;
  right: 0.25rem;
  color: var(--color-accent);
}

/* References */

.references {
  padding-block: 4rem;
}

.references__columns {
  display: grid;
  gap: 2rem;
}

.references__subheading {
  margin: 0 0 0.85rem;
  font-size: 1rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.references__countries,
.references__examples {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.references__countries li,
.references__examples li {
  padding-block: 0.45rem;
  border-bottom: 1px solid var(--color-border);
}

/* Process */

.process {
  padding-block: 4rem;
  background-color: var(--color-surface);
}

.process__list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.process__item {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: 1rem;
  padding-block: 1.35rem;
  border-top: 1px solid var(--color-border);
}

.process__item:last-child {
  border-bottom: 1px solid var(--color-border);
}

.process__number {
  color: var(--color-accent);
  font-size: 1.125rem;
  font-weight: 650;
  letter-spacing: 0.04em;
}

.process__title {
  margin: 0;
  font-size: 1.2rem;
}

.process__description {
  margin: 0.35rem 0 0;
  color: var(--color-text-muted);
}

/* Final CTA */

.final-cta {
  padding-block: 4rem;
}

.final-cta__inner {
  display: grid;
  gap: 2rem;
}

.final-cta__action {
  margin: 1.5rem 0 0;
}

.final-cta__phones {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 550;
}

/* Responsive */

@media (max-width: 1023px) {
  .site-header__inner {
    grid-template-columns: 1fr auto auto;
    grid-template-areas:
      "logo tools toggle"
      "nav nav nav";
  }

  .site-logo {
    grid-area: logo;
  }

  .site-header__tools {
    grid-area: tools;
  }

  .nav-toggle {
    display: inline-flex;
    grid-area: toggle;
  }

  .site-nav {
    grid-area: nav;
    display: none;
    padding-bottom: 0.5rem;
  }

  .site-header.is-nav-open .site-nav {
    display: block;
  }

  .site-nav__list {
    flex-direction: column;
    flex-wrap: wrap;
    gap: 0.15rem;
    overflow: visible;
  }

  .site-nav__link {
    display: block;
    padding: 0.55rem 0;
    font-size: 0.9375rem;
  }

  body.nav-open {
    overflow: hidden;
  }

  #kategorie,
  #domy,
  #komercni,
  #ocelove-haly,
  #technologie,
  #reference,
  #proces,
  #proc-rokoio,
  #kontakt,
  #projekty-domu {
    scroll-margin-top: 8.5rem;
  }

  .metrics__list {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .hero__image {
    height: clamp(16rem, 72vw, 24rem);
  }

  .theme-toggle {
    padding: 0.4rem 0.7rem;
    font-size: 0.8125rem;
  }
}

@media (max-width: 767px) {
  .site-header__inner {
    gap: 0.55rem 0.75rem;
  }
}

@media (min-width: 1024px) {
  .nav-toggle {
    display: none !important;
  }

  .site-nav {
    display: block !important;
  }
}

@media (min-width: 768px) {
  .hero {
    padding-block: 3.5rem 4rem;
  }

  .hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 2.5rem;
    align-items: center;
  }

  .hero__image {
    height: clamp(22rem, 38vw, 34rem);
  }

  .category {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: 2rem;
    align-items: end;
  }

  .category--commercial {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  }

  .category--commercial .category__media {
    order: 2;
  }

  .category--commercial .category__body {
    order: 1;
  }

  .tech-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    border-top: 0;
  }

  .tech-list__item {
    padding: 0 1.5rem 0 0;
    border-bottom: 0;
    border-right: 1px solid var(--color-border);
  }

  .tech-list__item:last-child {
    border-right: 0;
    padding-right: 0;
  }

  .why__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.75rem 2rem;
  }

  .references__columns {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 3rem;
  }

  .final-cta__inner {
    grid-template-columns: 1.4fr 1fr;
    align-items: end;
  }

  .site-footer__inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .site-footer__inner {
    grid-template-columns: 1.2fr 1fr 1fr 1fr;
  }

  .category__image {
    height: clamp(22rem, 34vw, 30rem);
  }
}

@media (min-width: 1280px) {
  .site-container {
    width: min(76rem, calc(100% - 3rem));
  }

  .hero__grid {
    gap: 3.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}