/* GKV Concrete Blocks — mobile-first stylesheet */

:root {
  --ink: #1e2125;
  --ink-soft: #4a5057;
  --paper: #ffffff;
  --concrete: #f1efea;
  --line: #d9d5cc;
  --accent: #ffc400;
  --accent-dark: #e0aa00;
  --whatsapp: #128c4a;
  --radius: 6px;
  --header-h: 104px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", Arial, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  padding-bottom: 76px; /* room for floating WhatsApp button */
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

h1,
h2,
h3 {
  margin: 0 0 0.6em;
  line-height: 1.15;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

h1 {
  font-size: clamp(2rem, 8vw, 3.5rem);
  font-weight: 800;
}

h2 {
  font-size: clamp(1.5rem, 5.5vw, 2.25rem);
  font-weight: 800;
}

h3 {
  font-size: 1.15rem;
  font-weight: 700;
}

p {
  margin: 0 0 1em;
}

a {
  color: inherit;
}

a:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

.narrow {
  max-width: 800px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 100;
  padding: 10px 16px;
  background: var(--accent);
  color: var(--ink);
  font-weight: 700;
}

.skip-link:focus {
  left: 0;
}

.icon {
  flex: none;
  fill: currentColor;
}

.eyebrow {
  margin-bottom: 0.6em;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 52px;
  padding: 12px 24px;
  border: 2px solid transparent;
  border-radius: var(--radius);
  font-size: 1.05rem;
  font-weight: 800;
  text-decoration: none;
  transition: background-color 0.15s ease, transform 0.15s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn-small {
  min-height: 44px;
  padding: 8px 16px;
  font-size: 0.95rem;
}

.btn-call {
  background: var(--accent);
  color: var(--ink);
}

.btn-call:hover {
  background: var(--accent-dark);
}

.btn-dark {
  background: var(--ink);
  color: #fff;
}

.btn-dark:hover {
  background: #000;
}

.btn-ghost {
  border-color: #fff;
  color: #fff;
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.15);
}

.btn-whatsapp {
  background: var(--whatsapp);
  color: #fff;
}

.btn-whatsapp:hover {
  background: #0d6f3a;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- Header and navigation ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--ink);
  color: #fff;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.25);
}

.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 8px;
  padding-bottom: 8px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 800;
}

.brand-mark {
  padding: 4px 9px;
  border-radius: 4px;
  background: var(--accent);
  color: var(--ink);
  font-size: 1.1rem;
  letter-spacing: 0.04em;
}

.brand-name {
  font-size: 1rem;
}

.site-nav {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.site-nav ul {
  display: flex;
  gap: 4px;
  margin: 0 auto;
  padding-top: 0;
  padding-bottom: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.site-nav ul::-webkit-scrollbar {
  display: none;
}

.site-nav a {
  display: block;
  padding: 11px 12px;
  font-size: 0.95rem;
  font-weight: 600;
  white-space: nowrap;
  text-decoration: none;
  color: #e6e6e6;
  border-bottom: 3px solid transparent;
}

.site-nav li:first-child a {
  padding-left: 0;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: #fff;
  border-bottom-color: var(--accent);
}

/* ---------- Hero ---------- */

.hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: 78vh;
  color: #fff;
  background: var(--ink);
  isolation: isolate;
}

.hero-img {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(180deg, rgba(20, 22, 25, 0.35) 0%, rgba(20, 22, 25, 0.88) 70%);
}

.hero-content {
  padding-top: 56px;
  padding-bottom: 40px;
}

.hero .eyebrow {
  color: var(--accent);
}

.hero-lead {
  max-width: 36em;
  font-size: 1.15rem;
}

.size-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.size-strip li {
  padding: 6px 14px;
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: 999px;
  font-size: 0.95rem;
  background: rgba(0, 0, 0, 0.3);
}

.size-strip strong {
  color: var(--accent);
}

/* ---------- Sections ---------- */

.section {
  padding: 56px 0;
}

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

.section-dark {
  background: var(--ink);
  color: #fff;
}

.section-dark .eyebrow {
  color: var(--accent);
}

.section-lead {
  max-width: 42em;
  font-size: 1.1rem;
  color: var(--ink-soft);
}

.section-dark .section-lead {
  color: #d5d7da;
}

.split {
  display: grid;
  gap: 32px;
}

.split-media {
  margin: 0;
}

.split-media img,
.gallery img {
  width: 100%;
  border-radius: var(--radius);
}

.split-media img {
  max-height: 520px;
  object-fit: cover;
}

figcaption {
  margin-top: 8px;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.check-list {
  margin: 0 0 1.5em;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  margin-bottom: 0.7em;
  padding-left: 30px;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.35em;
  width: 16px;
  height: 16px;
  border-radius: 3px;
  background: var(--accent);
}

/* ---------- Block size cards ---------- */

.cards {
  display: grid;
  gap: 16px;
  margin: 28px 0 12px;
}

.card {
  padding: 24px;
  border: 1px solid var(--line);
  border-top: 6px solid var(--ink);
  border-radius: var(--radius);
  background: var(--paper);
}

.card-size {
  margin: 0 0 4px;
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
  color: var(--ink);
}

.card h3 {
  margin-bottom: 0.3em;
}

.card-dims {
  font-weight: 700;
  color: var(--ink-soft);
}

.card p:last-child {
  margin-bottom: 0;
}

.note {
  margin-bottom: 40px;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.table-wrap {
  margin-bottom: 1.5em;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--paper);
  font-variant-numeric: tabular-nums;
}

th,
td {
  padding: 12px 14px;
  border: 1px solid var(--line);
  text-align: left;
}

thead th {
  background: var(--ink);
  color: #fff;
  font-size: 0.9rem;
}

/* ---------- CTA band ---------- */

.cta-band {
  padding: 40px 0;
  background: var(--accent);
  color: var(--ink);
}

.cta-inner {
  display: grid;
  gap: 20px;
}

.cta-band h2 {
  margin-bottom: 0.3em;
}

.cta-band p {
  margin: 0;
  font-size: 1.05rem;
}

/* ---------- Gallery ---------- */

.gallery {
  display: grid;
  gap: 20px;
  margin-top: 28px;
}

.gallery figure {
  margin: 0;
}

.gallery img {
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* ---------- FAQ ---------- */

.faq-list {
  margin-top: 24px;
  border-top: 1px solid var(--line);
}

.faq-list details {
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  position: relative;
  padding: 18px 40px 18px 0;
  cursor: pointer;
  list-style: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1;
}

.faq-list details[open] summary::after {
  content: "–";
}

.faq-list summary h3 {
  display: inline;
  margin: 0;
  font-size: 1.05rem;
}

.faq-list details p {
  margin: 0;
  padding: 0 0 20px;
  color: var(--ink-soft);
}

/* ---------- Contact ---------- */

.contact-grid {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

.contact-card {
  padding: 24px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.05);
}

.contact-card h3 {
  color: var(--accent);
}

.contact-card p {
  margin-bottom: 0.6em;
  color: #d5d7da;
}

.contact-card .btn {
  margin-top: 10px;
}

.contact-link {
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
  text-decoration: none;
}

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

address {
  margin-bottom: 1em;
  font-style: normal;
  font-size: 1.05rem;
  line-height: 1.7;
}

/* ---------- Footer ---------- */

.site-footer {
  padding: 28px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  background: #15171a;
  color: #c9ccd0;
  font-size: 0.9rem;
}

.footer-inner p {
  margin-bottom: 0.8em;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  margin: 0 0 1em;
  padding: 0;
  list-style: none;
}

.footer-nav a {
  display: inline-block;
  padding: 6px 0;
}

.copyright {
  margin: 0;
  color: #9a9fa5;
}

/* ---------- Floating WhatsApp button ---------- */

.whatsapp-float {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 60;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 52px;
  padding: 12px 18px;
  border-radius: 999px;
  background: var(--whatsapp);
  color: #fff;
  font-weight: 800;
  text-decoration: none;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.3);
}

.whatsapp-float:hover {
  background: #0d6f3a;
}

/* ---------- Larger screens ---------- */

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

  .cta-inner {
    grid-template-columns: 1fr auto;
    align-items: center;
  }
}

@media (min-width: 900px) {
  :root {
    --header-h: 72px;
  }

  body {
    padding-bottom: 0;
  }

  .site-header {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .header-bar {
    order: 2;
    width: auto;
    margin: 0;
    padding: 12px 20px;
  }

  /* brand sits left, nav centre, call button right */
  .site-header {
    display: grid;
    grid-template-columns: 1fr minmax(0, 1120px) 1fr;
  }

  .header-bar {
    grid-column: 2;
    grid-row: 1;
    width: 100%;
    max-width: none;
  }

  .site-nav {
    grid-column: 2;
    grid-row: 1;
    justify-self: center;
    border-top: 0;
  }

  .site-nav ul {
    width: auto;
    gap: 12px;
  }

  .site-nav li:first-child a {
    padding-left: 12px;
  }

  .section {
    padding: 88px 0;
  }

  .split {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 56px;
    align-items: center;
  }

  .split-reverse {
    grid-template-columns: 0.9fr 1.1fr;
  }

  .hero-content {
    padding-bottom: 72px;
  }

  .cta-band {
    padding: 56px 0;
  }
}

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

  .btn {
    transition: none;
  }
}