/* JKG BUDOWNICTWO — site plan / elevation drawing direction
   Palette: concrete, pine, steel blue, signal yellow */
:root {
  --paper: #eceeeb;
  --tint: #dfe4e2;
  --ink: #13201d;
  --pine: #1f3d35;
  --steel: #5f7c8a;
  --signal: #e3b23c;
  --line: rgba(19, 32, 29, .2);
  --wrap: 1280px;
  --pad: clamp(1.25rem, 4vw, 3rem);
  --space: clamp(4.5rem, 9vw, 8rem);
  --head: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --body: "IBM Plex Sans", "Segoe UI", Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 5rem; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 400 1.0625rem/1.65 var(--body); -webkit-font-smoothing: antialiased; }
img, svg { max-width: 100%; display: block; }
a { color: inherit; }
:focus-visible { outline: 3px solid var(--steel); outline-offset: 3px; }
h1, h2, h3, h4 { font-family: var(--head); line-height: 1.1; letter-spacing: -.02em; margin: 0 0 1rem; }
h2 { font-size: clamp(2rem, 4vw, 3.25rem); font-weight: 700; }
h3 { font-size: 1.35rem; font-weight: 700; }
p { margin: 0 0 1.1rem; max-width: 68ch; }

.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: var(--pad); }
.section { padding-block: var(--space); }
.section-tint { background: var(--tint); }
.section-dark { background: var(--pine); color: #f1f4f2; }

/* Buttons */
.btn { display: inline-block; background: var(--signal); color: var(--ink); font: 700 1rem var(--head); text-decoration: none; padding: .95rem 1.6rem; border: 0; border-radius: 2px; cursor: pointer; transition: background .2s, transform .2s; }
.btn:hover { background: #efc55c; transform: translateY(-2px); }
.btn-small { padding: .55rem 1.1rem; font-size: .95rem; }
.text-link { font-weight: 500; text-underline-offset: 5px; text-decoration-thickness: 2px; }
.text-link:hover { color: var(--steel); }

/* Header */
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(236, 238, 235, .96); border-bottom: 1px solid var(--line); }
.bar { display: flex; align-items: center; justify-content: space-between; min-height: 4.5rem; }
.brand { display: flex; align-items: center; gap: .7rem; font: 800 1.2rem var(--head); text-decoration: none; letter-spacing: -.01em; }
.mark { width: 1.35rem; height: 1.35rem; background: var(--pine); position: relative; }
.mark::after { content: ""; position: absolute; right: 0; bottom: 0; width: 55%; height: 55%; background: var(--signal); }
.nav { display: flex; align-items: center; gap: 2rem; }
.nav a:not(.btn) { text-decoration: none; font-weight: 500; padding-block: .3rem; background: linear-gradient(var(--ink), var(--ink)) 0 100% / 0 2px no-repeat; transition: background-size .25s; }
.nav a:not(.btn):hover { background-size: 100% 2px; }
.nav-toggle { display: none; width: 2.75rem; height: 2.75rem; background: none; border: 1px solid var(--line); border-radius: 2px; cursor: pointer; position: relative; }
.nav-toggle span { position: absolute; left: .8rem; right: .8rem; height: 2px; background: var(--ink); transition: transform .25s, top .25s; }
.nav-toggle span:first-child { top: 1.05rem; }
.nav-toggle span:last-child { top: 1.55rem; }
.nav-toggle[aria-expanded="true"] span:first-child { top: 1.3rem; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:last-child { top: 1.3rem; transform: rotate(-45deg); }

/* Hero */
.hero { padding-block: clamp(3rem, 7vw, 6rem) clamp(3rem, 6vw, 5rem); background:
  linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 48px 48px,
  linear-gradient(90deg, var(--line) 1px, transparent 1px) 0 0 / 48px 48px; background-color: var(--paper); border-bottom: 1px solid var(--line); }
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: clamp(2rem, 5vw, 5rem); align-items: center; }
.hero h1 { font-size: clamp(2.6rem, 6.2vw, 5.4rem); font-weight: 800; letter-spacing: -.035em; line-height: 1.02; margin-bottom: 1.5rem; }
.lead { font-size: 1.2rem; max-width: 56ch; }
.actions { display: flex; align-items: center; flex-wrap: wrap; gap: 1.5rem 2rem; margin-block: 2rem 2.5rem; }
.facts { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); border-top: 2px solid var(--ink); }
.facts li { padding: 1rem 1rem 0 0; font-size: .95rem; line-height: 1.4; }
.facts li + li { padding-left: 1rem; border-left: 1px solid var(--line); }
.facts strong { display: block; font: 700 1.05rem var(--head); margin-bottom: .2rem; }

.drawing { margin: 0; background: var(--paper); border: 2px solid var(--ink); padding: 1.25rem; }
.drawing .ln { stroke: var(--pine); }
.drawing .ln path { stroke-dasharray: 1; stroke-dashoffset: 1; animation: draw 2.2s cubic-bezier(.6, 0, .2, 1) forwards; }
.drawing .ln path:nth-child(2) { animation-delay: .25s; }
.drawing .ln path:nth-child(3) { animation-delay: .6s; }
.drawing .ln path:nth-child(n+4) { animation-delay: 1s; }
.drawing .door { fill: var(--signal); opacity: 0; animation: fade .6s 2.2s forwards; }
.drawing .dim { stroke: var(--steel); opacity: 0; animation: fade .8s 2.4s forwards; }
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes fade { to { opacity: 1; } }

/* About */
.about-grid { display: grid; grid-template-columns: 1.25fr .75fr; gap: clamp(2rem, 6vw, 6rem); align-items: start; }
.panel { background: var(--pine); color: #f1f4f2; padding: clamp(1.5rem, 3vw, 2.25rem); border-top: 6px solid var(--signal); }
.panel h3 { margin-bottom: 1.25rem; }
.panel dl { margin: 0; }
.panel dl div { padding-block: .85rem; border-top: 1px solid rgba(255, 255, 255, .22); }
.panel dt { font-size: .9rem; color: #b9c9c4; }
.panel dd { margin: .15rem 0 0; font-weight: 500; overflow-wrap: anywhere; }
.panel a { text-underline-offset: 3px; }

.steps-wrap { margin-top: clamp(3.5rem, 7vw, 6rem); }
.steps-title { font-size: 1.6rem; }
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); counter-reset: s; }
.steps li { padding: 1.5rem 1.5rem 0 0; border-top: 2px solid var(--ink); position: relative; }
.steps li + li { padding-left: 1.5rem; }
.steps li::before { content: ""; position: absolute; top: -7px; left: 0; width: 12px; height: 12px; background: var(--signal); border: 2px solid var(--ink); }
.steps li + li::before { left: 1.5rem; }
.steps span { font: 800 2.4rem var(--head); color: var(--steel); line-height: 1; }
.steps h4 { font-size: 1.15rem; margin: .5rem 0; }
.steps p { font-size: .98rem; }

/* Services */
.section-head { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: end; margin-bottom: 3rem; }
.section-head h2, .section-head p { margin: 0; }
.service-list { border-top: 2px solid var(--ink); }
.service { display: grid; grid-template-columns: 1fr 1.3fr; gap: 1rem 3rem; padding: 2rem 0; border-bottom: 1px solid var(--line); transition: padding-left .3s, background .3s; }
.service:hover { padding-left: 1.25rem; background: rgba(255, 255, 255, .45); }
.service h3, .service p { margin: 0; }
.service p { align-self: center; }

/* Why us */
.why-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: clamp(2rem, 6vw, 6rem); align-items: start; }
.why-intro { position: sticky; top: 6.5rem; }
.why-intro p { color: #cfdbd7; margin-bottom: 1.75rem; }
.why-list { list-style: none; margin: 0; padding: 0; }
.why-list li { padding: 1.75rem 0; border-top: 1px solid rgba(255, 255, 255, .25); }
.why-list li:last-child { border-bottom: 1px solid rgba(255, 255, 255, .25); }
.why-list h3 { font-size: clamp(1.4rem, 2.4vw, 1.9rem); margin-bottom: .5rem; }
.why-list p { margin: 0; color: #cfdbd7; }

/* Contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 6vw, 6rem); align-items: start; }
address { font-style: normal; margin-top: 2rem; padding: 1.5rem; border-left: 6px solid var(--signal); background: var(--tint); }
address p { margin-bottom: .7rem; }
address p:last-child { margin: 0; }
.form { background: #f7f8f6; border: 2px solid var(--ink); padding: clamp(1.5rem, 3vw, 2.5rem); }
.field { margin-bottom: 1.25rem; }
label { display: block; font-weight: 500; margin-bottom: .4rem; }
input, textarea { width: 100%; font: inherit; color: inherit; background: #fff; border: 1px solid var(--ink); border-radius: 2px; padding: .8rem .9rem; }
input:focus, textarea:focus { outline: 3px solid var(--steel); outline-offset: 1px; }
.field.invalid input, .field.invalid textarea { border-color: #a32a1f; border-width: 2px; }
.error { display: block; min-height: 1.2rem; margin-top: .3rem; font-size: .9rem; color: #a32a1f; }
.status { margin: 1rem 0 0; font-weight: 500; }

/* Footer */
.site-footer { background: var(--ink); color: #dfe5e2; padding-block: 2.5rem; font-size: .95rem; }
.foot { display: grid; grid-template-columns: 1fr 1fr auto; gap: 1.5rem 3rem; align-items: start; }
.foot p { margin: .25rem 0 0; }
.foot strong { color: #fff; }
.copy { color: #9fb0aa; }

/* Scroll reveal (only active when JS is running) */
.js .reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.js .reveal.in { opacity: 1; transform: none; }

/* Responsive */
@media (max-width: 960px) {
  .hero-grid, .about-grid, .why-grid, .contact-grid, .section-head { grid-template-columns: 1fr; }
  .drawing { max-width: 560px; }
  .steps { grid-template-columns: 1fr 1fr; row-gap: 2rem; }
  .steps li:nth-child(3) { padding-left: 0; }
  .steps li:nth-child(3)::before { left: 0; }
  .why-intro { position: static; }
  .service { grid-template-columns: 1fr; }
  .foot { grid-template-columns: 1fr; }
}
@media (max-width: 800px) {
  .nav-toggle { display: block; }
  .nav { position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0; background: var(--paper); border-bottom: 1px solid var(--line); padding: .5rem var(--pad) 1.25rem; display: none; }
  .nav.open { display: flex; }
  .nav a:not(.btn) { padding: .9rem 0; border-bottom: 1px solid var(--line); }
  .nav .btn { margin-top: 1rem; text-align: center; }
}
@media (max-width: 560px) {
  .facts { grid-template-columns: 1fr; }
  .facts li, .facts li + li { padding: .9rem 0; border-left: 0; border-bottom: 1px solid var(--line); }
  .steps { grid-template-columns: 1fr; }
  .steps li + li { padding-left: 0; }
  .steps li + li::before { left: 0; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .drawing .ln path { stroke-dashoffset: 0; }
  .drawing .door, .drawing .dim { opacity: 1; }
  .js .reveal { opacity: 1; transform: none; }
}