/* Elgersma Installaties — concept "De werktekening" */
:root {
  --paper: #F3F0E8;
  --paper-2: #E9E3D6;
  --sheet: #F8F6F0;
  --ink: #17212B;
  --ink-2: #3B4753;
  --muted: #66707B;
  --rule: #CDC5B5;
  --accent: #C9461A;
  --accent-dark: #A9390F;

  --f-head: "Bahnschrift", "DIN Alternate", "DIN Next", "Barlow Semi Condensed", "Roboto Condensed", "Arial Narrow", system-ui, sans-serif;
  --f-body: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --f-mono: ui-monospace, "Cascadia Mono", "SF Mono", Menlo, Consolas, monospace;
  --wrap: 1180px;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
[id] { scroll-margin-top: 84px; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1.0625rem/1.6 var(--f-body);
}
a { color: inherit; }
svg { max-width: 100%; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }

/* ---------- typografie ---------- */
h1, h2, h3 { font-family: var(--f-head); font-weight: 700; letter-spacing: -0.01em; line-height: 1.04; margin: 0; }
h1 { font-size: clamp(2.7rem, 7.2vw, 5.4rem); }
h2 { font-size: clamp(2.1rem, 4.6vw, 3.4rem); margin-bottom: 1.4rem; }
h3 { font-size: 1.3rem; line-height: 1.15; }
p { margin: 0 0 1rem; }
.lead { font-size: clamp(1.08rem, 1.5vw, 1.25rem); color: var(--ink-2); max-width: 36rem; }

.kicker {
  display: flex; align-items: center; gap: 0.65rem;
  margin: 0 0 1.1rem;
  font: 500 0.76rem/1.3 var(--f-mono);
  letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted);
}
.kicker::before { content: ""; width: 28px; height: 2px; background: var(--accent); flex: none; }

/* ---------- knoppen ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 0.55rem;
  min-height: 48px; padding: 0.75rem 1.3rem;
  border: 2px solid var(--ink); border-radius: 4px;
  background: transparent; color: var(--ink);
  font: 600 1rem/1 var(--f-body); text-decoration: none; cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.btn:hover { background: var(--ink); color: var(--paper); }
.btn-accent { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-accent:hover { background: var(--accent-dark); border-color: var(--accent-dark); color: #fff; }
.btn svg { width: 20px; height: 20px; flex: none; }
.btn-sm { min-height: 40px; padding: 0.5rem 1rem; font-size: 0.92rem; }
.btns { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.6rem; }

/* ---------- header ---------- */
.top {
  position: sticky; top: 0; z-index: 20;
  background: rgba(243, 240, 232, 0.93);
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}
.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1rem; height: 64px; }
.brand { display: flex; align-items: center; gap: 0.55rem; text-decoration: none; font: 700 1.25rem/1 var(--f-head); }
.brand span { font-weight: 400; color: var(--ink-2); }
.brand svg { width: 30px; height: 30px; flex: none; }
.menu { display: flex; align-items: center; gap: 1.6rem; }
.menu .m-link { text-decoration: none; font-size: 0.95rem; color: var(--ink-2); }
.menu .m-link:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 5px; }
@media (max-width: 780px) { .menu .m-link { display: none; } }
@media (max-width: 400px) { .brand span { display: none; } }

/* ---------- hero ---------- */
.hero { padding: clamp(3rem, 8vw, 6rem) 0 clamp(2rem, 4vw, 3rem); }
.hero h1 { max-width: 11ch; }
.hero-side .lead { margin-bottom: 0; }
.hero-grid { display: grid; gap: 1.6rem; }
@media (min-width: 960px) {
  .hero-grid { grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 4rem; align-items: end; }
}

/* ---------- 01: het tekenblad ---------- */
.plan { padding-bottom: clamp(3.5rem, 8vw, 6rem); }
.sheet { border: 1.5px solid var(--ink); background: var(--sheet); }
.sheet-head {
  display: flex; justify-content: space-between; gap: 0.5rem 1rem; flex-wrap: wrap;
  padding: 0.7rem 1rem; border-bottom: 1.5px solid var(--ink); background: var(--paper);
  font: 500 0.74rem/1.4 var(--f-mono); letter-spacing: 0.1em; text-transform: uppercase;
}
.sheet-head .hint { color: var(--muted); }
.sheet-body { display: grid; grid-template-columns: 1fr; }
@media (min-width: 960px) {
  .sheet-body { grid-template-columns: minmax(0, 1.65fr) minmax(0, 1fr); }
  .legend { border-left: 1.5px solid var(--ink); }
}
.drawing {
  padding: 1rem;
  background-image:
    linear-gradient(rgba(23, 33, 43, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 33, 43, 0.05) 1px, transparent 1px);
  background-size: 24px 24px;
  display: flex; align-items: flex-start;
}
.drawing svg { display: block; width: 100%; height: auto; position: sticky; top: 90px; }
@media (max-width: 959px) { .drawing { padding: 0.5rem; } }

/* tekening: lijnwerk */
.d { fill: none; stroke: var(--ink); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.d-wall { stroke-width: 5; stroke-linecap: square; stroke-linejoin: miter; }
.d-mid { stroke-width: 3; }
.d-thin { stroke-width: 1.3; }
.d-paper { fill: var(--sheet); }
.d-pv { fill: rgba(23, 33, 43, 0.12); }
.d-solid { fill: var(--ink); }
.d-label { font: 600 8px var(--f-mono); letter-spacing: 0.1em; fill: var(--muted); }

.wire { fill: none; stroke: var(--accent); stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; stroke-dasharray: 6 5; }
.fan { transform-box: view-box; transform-origin: 520px 416px; }
@media (prefers-reduced-motion: no-preference) {
  .wire { animation: flow 1.6s linear infinite; }
  .fan { animation: spin 5s linear infinite; }
}
@keyframes flow { to { stroke-dashoffset: -22; } }
@keyframes spin { to { transform: rotate(360deg); } }

/* tekening: nummers */
.spot { cursor: pointer; }
.spot:focus { outline: none; }
.spot circle { fill: #fff; stroke: var(--accent); stroke-width: 2.4; transition: fill 0.15s; }
.spot text { font: 700 12px var(--f-mono); fill: var(--ink); text-anchor: middle; transition: fill 0.15s; }
.spot.is-active circle, .spot:focus-visible circle { fill: var(--accent); }
.spot.is-active text, .spot:focus-visible text { fill: #fff; }

/* legenda */
.legend { list-style: none; margin: 0; padding: 0; background: var(--paper); }
@media (max-width: 959px) { .legend { border-top: 1.5px solid var(--ink); } }
.legend li {
  display: grid; grid-template-columns: 2.25rem 1fr; gap: 0.9rem;
  padding: 0.78rem 1rem; border-top: 1px solid var(--rule);
  transition: background 0.15s;
}
.legend li:first-child { border-top: 0; }
.legend .num {
  width: 2.25rem; height: 2.25rem; border-radius: 50%;
  display: grid; place-items: center;
  border: 2px solid var(--accent); background: #fff;
  font: 700 0.9rem/1 var(--f-mono);
  transition: background 0.15s, color 0.15s;
}
.legend h3 { font-size: 1.1rem; margin: 0.3rem 0 0.2rem; }
.legend p { margin: 0; font-size: 0.92rem; line-height: 1.45; color: var(--ink-2); }
.legend li.is-active, .legend li:target { background: var(--paper-2); }
.legend li.is-active .num, .legend li:target .num { background: var(--accent); color: #fff; }

/* ---------- 02: contact ---------- */
.contact { background: var(--ink); color: var(--paper); padding: clamp(4rem, 9vw, 7rem) 0; }
.contact .kicker { color: #A9B2BC; }
.contact h2 { font-size: clamp(2.7rem, 7.5vw, 5.4rem); margin-bottom: 1.2rem; }
.contact .lead { color: #C9D0D7; }
.contact .btn { border-color: var(--paper); color: var(--paper); overflow-wrap: anywhere; }
.contact .btn:hover { background: var(--paper); color: var(--ink); }
.contact .btn-accent { border-color: var(--accent); color: #fff; }
.contact .btn-accent:hover { background: var(--accent-dark); border-color: var(--accent-dark); color: #fff; }
.area {
  margin: 3rem 0 0; padding-top: 1.5rem; border-top: 1px solid rgba(243, 240, 232, 0.2);
  font: 500 0.82rem/1.7 var(--f-mono); letter-spacing: 0.04em; color: #A9B2BC; max-width: 52rem;
}
.area b { color: var(--paper); font-weight: 600; }

/* ---------- footer ---------- */
footer { padding: 1.4rem 0; font: 500 0.78rem/1.5 var(--f-mono); color: var(--muted); }
footer .wrap { display: flex; flex-wrap: wrap; gap: 0.4rem 1.5rem; justify-content: space-between; }