/* ---------------------------------------------------------------------------
   Warmtestore kastenwand-configurator — huisstijl
   Kleuren en typografie afgeleid van warmtestore.nl:
   Kanit (koppen), Montserrat (tekst), geel #FFC500 op donkergroen-zwart.
--------------------------------------------------------------------------- */
:root {
  --ws-zwart: #001011;
  --ws-donker: #141d1e;
  --ws-grijs: #334041;
  --ws-lijn: rgba(255, 255, 255, 0.10);
  --ws-geel: #ffc500;
  --ws-geel-zacht: rgba(255, 197, 0, 0.15);
  --ws-rood: #c02b0a;
  --ws-tekst: #ffffff;
  --ws-tekst-zacht: rgba(255, 255, 255, 0.7);
  --ws-tekst-dof: rgba(255, 255, 255, 0.45);
  --kop: 'Kanit', 'Montserrat', Arial, sans-serif;
  --tekst: 'Montserrat', Arial, sans-serif;
  --topbar-h: 72px;
  --panel-w: 460px;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  font-family: var(--tekst);
  font-size: 15px;
  line-height: 1.5;
  color: var(--ws-tekst-zacht);
  background: var(--ws-zwart);
  -webkit-font-smoothing: antialiased;
}
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
h1, h2, h3, h4 { font-family: var(--kop); color: var(--ws-tekst); margin: 0; line-height: 1.15; }
strong { color: var(--ws-tekst); }
[hidden] { display: none !important; }

.eyebrow {
  display: block;
  font-family: var(--kop);
  font-weight: 300;
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ws-geel);
}

/* ---- knoppen ------------------------------------------------------------ */
.btn-primary, .btn-secondary {
  font-family: var(--kop);
  font-weight: 600;
  font-size: 16px;
  padding: 13px 22px;
  border: 0;
  border-radius: 0;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
  transition: background .15s, transform .15s;
}
.btn-primary { background: var(--ws-geel); color: #000; }
.btn-primary::after { content: '→'; font-weight: 400; }
.btn-primary:hover { background: #ffd23f; }
.btn-secondary { background: var(--ws-geel-zacht); color: var(--ws-geel); }
.btn-secondary:hover { background: rgba(255, 197, 0, 0.25); }
.btn-tekst { background: none; border: 0; color: var(--ws-tekst-zacht); text-decoration: underline; padding: 6px 0; }
.btn-tekst:hover { color: var(--ws-tekst); }

/* ---- topbar ------------------------------------------------------------- */
.topbar {
  height: var(--topbar-h);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px;
  padding: 0 28px;
  background: var(--ws-zwart);
  border-bottom: 1px solid var(--ws-lijn);
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20;
}
.brand { display: flex; flex-direction: column; text-decoration: none; line-height: 1.1; }
.brand-mark { font-family: var(--kop); font-weight: 800; font-size: 24px; color: var(--ws-tekst); letter-spacing: -0.01em; }
.brand-tagline { font-family: var(--kop); font-weight: 300; font-size: 11px; color: var(--ws-geel); letter-spacing: 0.18em; text-transform: uppercase; }
.demo-badge { display: inline-block; margin-left: 8px; padding: 1px 7px; background: var(--ws-rood); color: #fff; font-weight: 600; letter-spacing: 0.08em; font-size: 10px; vertical-align: middle; }
.topbar-title strong { display: block; font-family: var(--kop); font-weight: 700; font-size: 20px; }
.topbar-price { text-align: right; line-height: 1.1; }
.topbar-price strong { display: block; font-family: var(--kop); font-weight: 800; font-size: 30px; }
.topbar-price small { color: var(--ws-tekst-dof); font-size: 11px; }

/* ---- layout ------------------------------------------------------------- */
.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--panel-w);
  min-height: calc(100vh - var(--topbar-h));
}
.viewer {
  position: sticky;
  top: var(--topbar-h);
  height: calc(100vh - var(--topbar-h));
  display: flex;
  flex-direction: column;
  padding: 18px 22px;
  gap: 12px;
  background: var(--ws-zwart);
}
.viewer-tabs { display: flex; gap: 6px; }
.tab {
  background: transparent; border: 1px solid var(--ws-lijn); color: var(--ws-tekst-zacht);
  padding: 8px 16px; font-family: var(--kop); font-weight: 400; font-size: 14px;
}
.tab.is-active { background: var(--ws-geel); color: #000; border-color: var(--ws-geel); font-weight: 600; }
.viewer-stage {
  position: relative; flex: 1; min-height: 240px;
  background: #e6e2da; overflow: hidden;
}
.stage-3d { position: absolute; inset: 0; }
.stage-3d canvas { display: block; width: 100% !important; height: 100% !important; }
.stage-tekening { position: absolute; inset: 0; padding: 16px; background: #fff; display: flex; align-items: center; justify-content: center; }
.stage-tekening svg { max-width: 100%; max-height: 100%; }
.viewer-tools { position: absolute; left: 14px; top: 14px; display: flex; gap: 6px; }
.chip {
  background: rgba(0, 16, 17, 0.85); color: #fff; border: 0; padding: 7px 12px;
  font-family: var(--kop); font-size: 13px; backdrop-filter: blur(6px);
}
.chip:hover { background: var(--ws-geel); color: #000; }
.viewer-hint { position: absolute; right: 14px; bottom: 12px; font-size: 12px; color: rgba(0, 16, 17, 0.6); }
.viewer-loading { position: absolute; inset: 0; display: grid; place-items: center; color: #334041; font-family: var(--kop); background: #e6e2da; }
.viewer-meta { font-size: 13px; color: var(--ws-tekst-dof); display: flex; flex-wrap: wrap; gap: 6px 18px; }
.viewer-meta b { color: var(--ws-tekst-zacht); font-weight: 600; }
.waarschuwingen { background: rgba(192, 43, 10, 0.18); border-left: 3px solid var(--ws-rood); padding: 10px 14px; font-size: 13px; color: #fff; }
.waarschuwingen p { margin: 0 0 4px; }

/* ---- stappenpaneel ------------------------------------------------------ */
.panel { background: var(--ws-donker); border-left: 1px solid var(--ws-lijn); display: flex; flex-direction: column; }
.stappen { flex: 1; }
.stap { border-bottom: 1px solid var(--ws-lijn); }
.stap-kop {
  width: 100%; background: none; border: 0; text-align: left;
  display: grid; grid-template-columns: 34px 1fr auto 20px; gap: 14px; align-items: center;
  padding: 18px 22px;
}
.stap-kop:hover { background: rgba(255, 255, 255, 0.03); }
.stap-nr {
  width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center;
  font-family: var(--kop); font-weight: 600; font-size: 14px;
  border: 1px solid var(--ws-lijn); color: var(--ws-tekst-zacht);
}
.stap.is-open .stap-nr { background: var(--ws-geel); color: #000; border-color: var(--ws-geel); }
.stap-titel { font-family: var(--kop); font-weight: 600; font-size: 17px; color: var(--ws-tekst); display: block; }
.stap-samenvatting { font-size: 12.5px; color: var(--ws-tekst-dof); display: block; }
.stap-prijs { font-family: var(--kop); font-weight: 600; color: var(--ws-tekst); font-size: 15px; }
.stap-chevron { color: var(--ws-tekst-dof); transition: transform .2s; font-size: 12px; }
.stap.is-open .stap-chevron { transform: rotate(180deg); }
.stap-body { display: none; padding: 4px 22px 24px; }
.stap.is-open .stap-body { display: block; }

.groep { margin-top: 18px; }
.groep-label { font-family: var(--kop); font-weight: 400; font-size: 14px; color: var(--ws-tekst); display: flex; justify-content: space-between; margin-bottom: 8px; }
.groep-label small { color: var(--ws-tekst-dof); font-family: var(--tekst); font-size: 12px; }
.hint { font-size: 12px; color: var(--ws-tekst-dof); margin: 6px 0 0; }

/* Velden */
.veld-rij { display: grid; grid-template-columns: repeat(auto-fit, minmax(110px, 1fr)); gap: 10px; }
.veld { display: block; }
.veld > span { display: block; font-size: 12px; color: var(--ws-tekst-dof); margin-bottom: 4px; }
.veld-mm { position: relative; }
.veld-mm input {
  width: 100%; background: var(--ws-zwart); border: 1px solid var(--ws-lijn); color: #fff;
  padding: 10px 40px 10px 12px; font-family: var(--kop); font-size: 17px; font-weight: 600;
  border-radius: 0; -moz-appearance: textfield;
}
.veld-mm input::-webkit-inner-spin-button, .veld-mm input::-webkit-outer-spin-button { -webkit-appearance: none; }
.veld-mm input:focus { outline: 0; border-color: var(--ws-geel); }
.veld-mm input:disabled { opacity: .45; }
.veld-mm::after { content: 'mm'; position: absolute; right: 12px; top: 50%; transform: translateY(-50%); font-size: 12px; color: var(--ws-tekst-dof); }

/* Presets */
.presets { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.preset { background: transparent; border: 1px solid var(--ws-lijn); color: var(--ws-tekst-zacht); font-size: 12px; padding: 5px 10px; }
.preset:hover { border-color: var(--ws-geel); color: #fff; }

/* Stepper */
.stepper { display: inline-flex; align-items: stretch; border: 1px solid var(--ws-lijn); }
.stepper button { width: 38px; background: var(--ws-zwart); border: 0; color: #fff; font-size: 18px; }
.stepper button:hover { background: var(--ws-geel); color: #000; }
.stepper button:disabled { opacity: .3; pointer-events: none; }
.stepper output { min-width: 44px; display: grid; place-items: center; font-family: var(--kop); font-weight: 600; font-size: 16px; color: #fff; background: var(--ws-donker); }

/* Optietegels */
.tegels { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.tegels.kol-3 { grid-template-columns: repeat(3, 1fr); }
.tegel {
  background: var(--ws-zwart); border: 1px solid var(--ws-lijn); color: var(--ws-tekst-zacht);
  padding: 11px 12px; text-align: left; display: flex; flex-direction: column; gap: 2px; position: relative;
  transition: border-color .15s;
}
.tegel:hover { border-color: rgba(255, 197, 0, 0.5); }
.tegel.is-actief { border-color: var(--ws-geel); box-shadow: inset 0 0 0 1px var(--ws-geel); }
.tegel.is-actief::after { content: '✓'; position: absolute; right: 10px; top: 8px; color: var(--ws-geel); font-size: 13px; font-weight: 700; }
.tegel-naam { font-family: var(--kop); font-weight: 600; font-size: 14px; color: #fff; padding-right: 18px; }
.tegel-sub { font-size: 11.5px; color: var(--ws-tekst-dof); }
.tegel-prijs { font-size: 12px; color: var(--ws-geel); margin-top: 3px; }
.tegel:disabled { opacity: .35; cursor: not-allowed; }

.tegel-haard { padding: 0 0 12px; overflow: hidden; }
.tegel-haard > span { padding: 0 12px; }
.tegel-haard .tegel-naam { margin-top: 10px; }
.tegel-foto { display: block; width: 100%; aspect-ratio: 3 / 2; object-fit: cover; }
.tegel-haard.is-actief::after { background: var(--ws-geel); color: #000; width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; }
.hint a { color: var(--ws-geel); }

/* Kleurstalen */
.stalen { display: flex; flex-wrap: wrap; gap: 8px; }
.staal {
  width: 46px; height: 46px; border-radius: 50%; border: 2px solid transparent; padding: 0;
  background: var(--staal); box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.15); position: relative;
}
.staal.is-actief { border-color: var(--ws-geel); }
.staal.is-actief::after { content: '✓'; position: absolute; inset: 0; display: grid; place-items: center; color: var(--staal-tekst, #fff); font-weight: 700; font-size: 16px; }
.staal-label { font-size: 12.5px; color: var(--ws-tekst-zacht); margin-top: 8px; }
.staal-label b { color: #fff; font-weight: 600; }

/* Kolomkaarten */
.kolommen { display: flex; flex-direction: column; gap: 10px; }
.kolom-kaart { background: var(--ws-zwart); border: 1px solid var(--ws-lijn); padding: 12px 14px; }
.kolom-kaart.is-haard { border-color: rgba(255, 138, 42, 0.5); }
.kolom-kop { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.kolom-kop b { font-family: var(--kop); font-weight: 600; color: #fff; }
.kolom-kop small { color: var(--ws-tekst-dof); font-size: 12px; }
.segment { display: flex; flex-wrap: wrap; gap: 4px; }
.segment button { background: var(--ws-donker); border: 1px solid var(--ws-lijn); color: var(--ws-tekst-zacht); padding: 6px 10px; font-size: 12.5px; }
.segment button.is-actief { background: var(--ws-geel); color: #000; border-color: var(--ws-geel); font-weight: 600; }
.segment button:disabled { opacity: .35; }
.kolom-regel { display: grid; grid-template-columns: 1fr auto; gap: 10px; align-items: center; margin-top: 10px; font-size: 12.5px; }
.kolom-regel .veld-mm { width: 120px; }
.kolom-regel .veld-mm input { padding: 7px 34px 7px 10px; font-size: 14px; }
.schakel { display: inline-flex; align-items: center; gap: 8px; font-size: 12.5px; cursor: pointer; user-select: none; }
.schakel input { accent-color: var(--ws-geel); width: 16px; height: 16px; margin: 0; }
.haard-badge { color: #ff8a2a; font-size: 12px; }

/* Overzicht */
.overzicht { border-top: 1px solid var(--ws-lijn); }
.overzicht-regel { display: flex; justify-content: space-between; gap: 12px; padding: 7px 0; border-bottom: 1px solid var(--ws-lijn); font-size: 13px; }
.overzicht-regel span:last-child { font-family: var(--kop); font-weight: 600; color: #fff; white-space: nowrap; }
.overzicht-totaal { display: flex; justify-content: space-between; padding: 14px 0 0; font-family: var(--kop); font-size: 20px; font-weight: 800; color: #fff; }
.acties { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.acties .btn-secondary { font-size: 14px; padding: 10px 14px; }

/* Footer van het paneel */
.panel-footer {
  position: sticky; bottom: 0; background: var(--ws-zwart); border-top: 1px solid var(--ws-lijn);
  padding: 14px 22px; display: flex; justify-content: space-between; align-items: center; gap: 14px;
}
.footer-prijs strong { display: block; font-family: var(--kop); font-weight: 800; font-size: 26px; line-height: 1; }

/* ---- dialoog ------------------------------------------------------------ */
.dialog { border: 0; padding: 0; background: var(--ws-donker); color: var(--ws-tekst-zacht); width: min(560px, 92vw); }
.dialog::backdrop { background: rgba(0, 16, 17, 0.75); backdrop-filter: blur(4px); }
.dialog form, .dialog-inhoud { padding: 28px; display: flex; flex-direction: column; gap: 12px; }
.dialog-breed { width: min(1100px, 94vw); }
.dialog-kop { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.dialog-kop .btn-secondary { font-size: 14px; padding: 8px 14px; }
#beeldImg { max-width: 100%; max-height: 70vh; object-fit: contain; background: #fff; }
.dialog h2 { font-size: 30px; font-weight: 800; }
.dialog-intro { margin: 0 0 6px; font-size: 14px; }
.dialog label { display: block; font-size: 12px; color: var(--ws-tekst-dof); }
.dialog input, .dialog textarea {
  display: block; width: 100%; margin-top: 4px; background: var(--ws-zwart); border: 1px solid var(--ws-lijn);
  color: #fff; padding: 10px 12px; border-radius: 0; font-size: 14px;
}
.dialog input:focus, .dialog textarea:focus { outline: 0; border-color: var(--ws-geel); }
.dialog-samenvatting { background: var(--ws-zwart); padding: 12px 14px; font-size: 12.5px; max-height: 160px; overflow: auto; white-space: pre-line; }
.dialog-acties { display: flex; justify-content: flex-end; gap: 8px; margin-top: 6px; }

.toast {
  position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%); z-index: 50;
  background: var(--ws-geel); color: #000; font-family: var(--kop); font-weight: 600; padding: 10px 18px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

/* ---- responsief ---------------------------------------------------------- */
@media (max-width: 1100px) { :root { --panel-w: 400px; } }
@media (max-width: 900px) {
  .topbar { grid-template-columns: auto 1fr; gap: 14px; padding: 0 16px; }
  .topbar-title { display: none; }
  .layout { grid-template-columns: 1fr; }
  .viewer { position: sticky; top: var(--topbar-h); height: 46vh; padding: 10px 12px; z-index: 5; }
  .viewer-meta, .waarschuwingen { display: none; }
  .panel { border-left: 0; }
  .tegels.kol-3 { grid-template-columns: repeat(2, 1fr); }
}