@font-face { font-family: "Space Grotesk"; src: url("/assets/fonts/space-grotesk-500-normal.woff2") format("woff2"); font-weight: 500; font-display: swap; }
@font-face { font-family: "Space Grotesk"; src: url("/assets/fonts/space-grotesk-700-normal.woff2") format("woff2"); font-weight: 700; font-display: swap; }
@font-face { font-family: "IBM Plex Mono"; src: url("/assets/fonts/ibm-plex-mono-400-normal.woff2") format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "IBM Plex Mono"; src: url("/assets/fonts/ibm-plex-mono-500-normal.woff2") format("woff2"); font-weight: 500; font-display: swap; }

:root {
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "IBM Plex Mono", ui-monospace, monospace;
  --text-sm: 0.8125rem;
  --text-base: clamp(0.95rem, 0.92rem + 0.15vw, 1.05rem);
  --text-lead: clamp(1.1rem, 1rem + 0.5vw, 1.35rem);
  --text-h2: clamp(1.9rem, 1.3rem + 3vw, 3.75rem);
  --text-title: clamp(2.4rem, 1.5rem + 4.4vw, 5.25rem);
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: clamp(5rem, 9vw, 8rem);
  --gutter: clamp(1rem, 3vw, 2.5rem);
  --content-max: 100rem;
  --prose-max: 60ch;
  --radius-card: 0;
  --color-text: #1b262c;
  --color-surface: #e9ece6;
  --color-paper: #f4f5f0;
  --color-line: #9aa59f;
  --color-grid: rgb(27 38 44 / 0.07);
  --color-accent: #b93508;
  --color-error: #a11212;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  color: var(--color-text);
  background-color: var(--color-surface);
  background-image: linear-gradient(var(--color-grid) 1px, transparent 1px), linear-gradient(90deg, var(--color-grid) 1px, transparent 1px);
  background-size: 24px 24px;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
}
h1, h2, h3 { font-family: var(--font-display); font-weight: 700; line-height: 1.04; letter-spacing: -0.025em; hyphens: auto; margin: 0; }
p { margin: 0 0 var(--space-sm); }
img { display: block; width: 100%; height: auto; filter: contrast(1.02); }
a { color: inherit; }
:focus-visible { outline: 3px solid var(--color-accent); outline-offset: 2px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }

.skip-link { position: absolute; left: var(--gutter); top: -6rem; z-index: 20; padding: 0.75rem 1rem; background: var(--color-text); color: var(--color-paper); }
.skip-link:focus { top: 0.5rem; }
.demo-notice { margin: 0; padding-inline: var(--gutter); background: var(--color-text); color: var(--color-paper); font-size: var(--text-sm); }
.demo-notice a { display: inline-block; padding-block: 0.7rem; min-height: 44px; }
.sheet-label { font-size: var(--text-sm); font-weight: 500; letter-spacing: 0.04em; text-transform: uppercase; color: var(--color-accent); margin-bottom: var(--space-xs); }

/* The header is the title block of a technical drawing. */
.site-header { display: grid; grid-template-columns: 1fr; margin: var(--gutter); border: 2px solid var(--color-text); background: var(--color-paper); }
.site-header__brand { display: block; padding: 0.6rem 0.75rem; border-bottom: 2px solid var(--color-text); text-decoration: none; }
.site-header__wordmark { display: block; font-family: var(--font-display); font-size: 1.3rem; font-weight: 700; letter-spacing: -0.02em; }
.site-header__sub { display: block; font-size: var(--text-sm); }
.site-header__nav { display: grid; grid-template-columns: repeat(2, 1fr); }
.site-header__nav a { display: block; min-height: 52px; padding: 0.4rem 0.75rem; border-right: 1px solid var(--color-text); border-bottom: 1px solid var(--color-text); text-decoration: none; font-weight: 500; transition: background-color 150ms; }
.site-header__nav a:nth-child(even) { border-right: 0; }
.site-header__nav a:nth-last-child(-n + 2) { border-bottom: 0; }
.site-header__nav a span { display: block; font-size: 0.6875rem; font-weight: 400; }
.site-header__nav a:hover { background: var(--color-surface); }
.site-header__nav a[aria-current="page"] { background: var(--color-text); color: var(--color-paper); }

.hero { padding: var(--space-md) var(--gutter) var(--space-xl); display: grid; gap: var(--space-md); }
.hero__title { font-size: var(--text-title); max-width: 16ch; margin-bottom: var(--space-sm); }
.hero__tagline { font-size: var(--text-lead); max-width: 44ch; }

.planner { display: grid; gap: var(--space-md); background: var(--color-paper); border: 2px solid var(--color-text); padding: var(--space-sm); min-width: 0; }
.planner__drawing { margin: 0; min-width: 0; }
.planner__drawing svg { display: block; width: 100%; height: auto; }
.planner__drawing figcaption { font-size: var(--text-sm); }
.plan__leg { fill: var(--color-text); }
.plan__floor { stroke: var(--color-line); stroke-width: 1; }
.plan__fill { fill: #c79a62; transition: fill 250ms; }
.plan__grain line { stroke: rgb(40 25 10 / 0.28); stroke-width: 0.8; }
.plan__top { fill: none; stroke: var(--color-text); stroke-width: 2; }
.plan__dim line { stroke: var(--color-accent); stroke-width: 1; }
.plan__dim text { fill: var(--color-accent); font: 500 12px var(--font-body); }
.planner__controls { display: grid; gap: var(--space-sm); align-content: start; }
.form__field { display: grid; gap: 0.25rem; }
.form__field label { display: flex; justify-content: space-between; gap: var(--space-sm); font-weight: 500; }
.form__field input:not([type="range"]), .form__field textarea { min-height: 48px; padding: 0.6rem; border: 2px solid var(--color-text); border-radius: 0; background: var(--color-paper); color: inherit; font: inherit; }
input[type="range"] { width: 100%; height: 44px; margin: 0; accent-color: var(--color-accent); cursor: ew-resize; }
.woods { border: 0; padding: 0; margin: 0; display: grid; gap: 0.25rem; min-width: 0; }
.woods legend { padding: 0; font-weight: 500; margin-bottom: 0.25rem; }
.wood { display: flex; align-items: center; gap: 0.6rem; min-height: 48px; padding: 0.25rem 0.5rem; border: 1px solid var(--color-line); cursor: pointer; }
.wood:has(input:checked) { border-color: var(--color-text); box-shadow: inset 0 0 0 1px var(--color-text); }
.wood small { display: block; font-size: 0.75rem; }
.wood input { accent-color: var(--color-accent); width: 1.1rem; height: 1.1rem; margin: 0; }
.wood__swatch { width: 2rem; height: 2rem; flex: none; border: 1px solid var(--color-text); }
.wood__swatch--esche { background: #e0c9a0; }
.wood__swatch--eiche { background: #c79a62; }
.wood__swatch--nussbaum { background: #6b4630; }
.planner__price { display: flex; align-items: baseline; justify-content: space-between; gap: var(--space-sm); margin: 0; border-top: 2px solid var(--color-text); padding-top: var(--space-xs); }
.planner__price strong { font-family: var(--font-display); font-size: clamp(2rem, 1.6rem + 1.6vw, 3rem); line-height: 1; white-space: nowrap; }

.button { display: inline-flex; align-items: center; justify-content: center; min-height: 52px; padding: 0.8rem 1.25rem; border: 2px solid var(--color-accent); background: var(--color-accent); color: #fff; font: 500 1rem/1.2 var(--font-body); text-decoration: none; cursor: pointer; transition: background-color 150ms, color 150ms; }
.button:hover { background: transparent; color: var(--color-accent); }
.button:disabled { opacity: 0.55; cursor: not-allowed; }
.text-link { display: inline-flex; align-items: center; min-height: 44px; font-weight: 500; color: var(--color-accent); text-underline-offset: 0.25em; }

.steps { padding: var(--space-xl) var(--gutter); background: var(--color-text); color: var(--color-paper); }
.steps h2 { font-size: var(--text-h2); margin-bottom: var(--space-lg); }
.steps__list { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-md); }
.steps__list h3 { font-size: 1.6rem; margin-bottom: var(--space-xs); }
.steps__rule { display: block; height: 2px; margin-bottom: var(--space-sm); background: #ff8a5c; transform-origin: left; transition: transform 600ms ease; }
.js [data-animate]:not(.is-revealed) .steps__rule { transform: scaleX(0); }

.feature { display: grid; }
.feature__body { padding: var(--space-lg) var(--gutter); background: var(--color-paper); border-block: 2px solid var(--color-text); }
.feature__title { font-size: var(--text-h2); margin-bottom: var(--space-sm); hyphens: manual; }
.feature__text { max-width: var(--prose-max); }

.page { max-width: var(--content-max); margin-inline: auto; padding: var(--space-md) var(--gutter) var(--space-xl); }
.page h1 { font-size: var(--text-title); max-width: 16ch; margin-bottom: var(--space-sm); }
.page__lead { font-size: var(--text-lead); max-width: var(--prose-max); margin-bottom: var(--space-lg); }
.page__wide { margin-top: var(--space-lg); max-width: 70rem; border: 2px solid var(--color-text); }
.parts { list-style: none; margin: 0; padding: 0; display: grid; border-top: 2px solid var(--color-text); }
.parts li { padding-block: var(--space-sm); border-bottom: 1px solid var(--color-text); }
.parts h2 { font-size: var(--text-h2); margin-bottom: var(--space-xs); }
.parts p { max-width: var(--prose-max); margin: 0; }
.project { display: grid; gap: var(--space-sm); margin-bottom: var(--space-lg); background: var(--color-paper); border: 2px solid var(--color-text); padding: var(--space-sm); }
.project h2 { font-size: var(--text-h2); margin-bottom: var(--space-sm); }
.project dl { margin: 0 0 var(--space-sm); }
.project dl div { display: flex; justify-content: space-between; gap: var(--space-sm); padding-block: 0.3rem; border-bottom: 1px solid var(--color-line); }
.project dd { margin: 0; font-weight: 500; text-align: right; }

.form { max-width: 38rem; display: grid; gap: var(--space-sm); }
.form__hint { font-size: var(--text-sm); margin: 0; }
.form__status { font-weight: 500; color: var(--color-accent); margin: 0; }

.site-footer { padding: var(--space-lg) var(--gutter); border-top: 2px solid var(--color-text); background: var(--color-paper); }
.site-footer__sheet { margin: 0 0 var(--space-md); display: grid; gap: var(--space-sm); }
.site-footer__sheet dt { font-size: var(--text-sm); color: var(--color-accent); }
.site-footer__sheet dd { margin: 0; }
.site-footer a { display: inline-block; padding-block: 0.65rem; }
.site-footer__nav { display: flex; gap: var(--space-sm); }

@media (min-width: 48rem) {
  .site-header__nav { grid-template-columns: repeat(4, 1fr); }
  .site-header__nav a, .site-header__nav a:nth-child(even) { border-right: 1px solid var(--color-text); border-bottom: 0; }
  .site-header__nav a:last-child { border-right: 0; }
  .steps__list { grid-template-columns: repeat(4, 1fr); }
  .site-footer__sheet { grid-template-columns: repeat(4, 1fr); }
  .planner { grid-template-columns: 1.5fr 1fr; align-items: center; }
}

@media (min-width: 60rem) {
  .feature { grid-template-columns: 7fr 5fr; align-items: stretch; }
  .feature__media img { height: 100%; object-fit: cover; }
  .feature__body { border-block: 0; border-left: 2px solid var(--color-text); display: flex; flex-direction: column; justify-content: center; }
  .project { grid-template-columns: 1.3fr 1fr; gap: var(--space-md); align-items: end; }
  .project--flip { grid-template-columns: 1fr 1.3fr; }
}

/* Wide screens: the title block moves to the sheet's lower right corner, as on a real drawing. */
@media (min-width: 75rem) {
  .site-header { position: fixed; right: var(--gutter); bottom: var(--gutter); z-index: 10; width: 21rem; margin: 0; }
  .site-header__nav { grid-template-columns: repeat(2, 1fr); }
  .site-header__nav a, .site-header__nav a:nth-child(even) { border-bottom: 1px solid var(--color-text); }
  .site-header__nav a:nth-child(even) { border-right: 0; }
  .site-header__nav a:nth-last-child(-n + 2) { border-bottom: 0; }
  body { padding-right: calc(var(--gutter) + 22rem); }
  .hero__title { max-width: 20ch; }
  .demo-notice { margin-right: calc((var(--gutter) + 22rem) * -1); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}