/* ===========================================================
   MÄTVERKET — Delad stilfil
   Varm, mörk verkstadskänsla. Signaturelement: måttbands-tickar.
   =========================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600;9..144,700&family=Inter:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root {
  /* Color */
  --bg: #1B1713;
  --bg-elevated: #221C16;
  --bg-card: #2A231C;
  --bg-card-hover: #302820;
  --accent: #BC7A3F;
  --accent-light: #DDAB6E;
  --accent-deep: #8A5A2E;
  --ink: #F1E7D8;
  --ink-muted: #B7A996;
  --ink-faint: #766A5A;
  --line: #3C3226;
  --line-bright: #55452F;
  --success: #7E9270;
  --success-bg: #212a1e;
  --error: #C1604A;
  --error-bg: #2c1c17;

  /* Type */
  --font-display: 'Fraunces', serif;
  --font-body: 'Inter', -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  /* Layout */
  --max-width: 1120px;
  --radius: 3px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

body::before {
  /* faint grain / paper-of-the-shop texture */
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    radial-gradient(circle at 20% 20%, rgba(188,122,63,0.04), transparent 45%),
    radial-gradient(circle at 82% 68%, rgba(188,122,63,0.03), transparent 40%);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.4rem, 5vw, 4rem); font-weight: 500; line-height: 1.05; }
h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); line-height: 1.15; }
h3 { font-size: 1.25rem; }

p { margin: 0 0 1em; color: var(--ink-muted); }

a { color: var(--accent-light); text-decoration: none; }
a:hover { color: var(--accent); }

.mono { font-family: var(--font-mono); }

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

@media (max-width: 640px) {
  .wrap { padding: 0 20px; }
}

/* ---------- Focus ---------- */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 2px solid var(--accent-light);
  outline-offset: 2px;
}

/* ---------- Nav ---------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(27, 23, 19, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.site-nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--ink);
}

.brand .brand-mark {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  border: 1px solid var(--accent-deep);
  padding: 3px 7px;
  border-radius: 2px;
  letter-spacing: 0.04em;
}

.brand:hover { color: var(--ink); }

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--ink-muted);
  font-size: 0.95rem;
  font-weight: 500;
}

.nav-links a.active,
.nav-links a:hover {
  color: var(--accent-light);
}

.nav-links li { position: relative; }

@media (max-width: 720px) {
  .nav-links { gap: 18px; }
  .nav-links span.label { display: none; }
}

/* ---------- Ruler divider (signature element) ---------- */
.ruler {
  height: 26px;
  width: 100%;
  position: relative;
  background-image:
    repeating-linear-gradient(
      to right,
      var(--line-bright) 0, var(--line-bright) 1px,
      transparent 1px, transparent 20px
    ),
    repeating-linear-gradient(
      to right,
      var(--accent-deep) 0, var(--accent-deep) 1px,
      transparent 1px, transparent 100px
    );
  background-size: 20px 10px, 100px 18px;
  background-position: left top, left bottom;
  background-repeat: repeat-x;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  opacity: 0.8;
}

.ruler.tight { height: 14px; background-size: 10px 6px, 50px 10px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 13px 26px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.btn-primary {
  background: var(--accent);
  color: #211609;
}
.btn-primary:hover { background: var(--accent-light); transform: translateY(-1px); }

.btn-ghost {
  background: transparent;
  border-color: var(--line-bright);
  color: var(--ink);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent-light); }

/* ---------- Cards ---------- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px;
  position: relative;
}

/* corner brackets — blueprint marks */
.card-marked {
  position: relative;
}
.card-marked::before,
.card-marked::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border: 1.5px solid var(--accent-deep);
  opacity: 0.7;
}
.card-marked::before {
  top: -1px; left: -1px;
  border-right: none; border-bottom: none;
}
.card-marked::after {
  bottom: -1px; right: -1px;
  border-left: none; border-top: none;
}

/* ---------- Tool/calculator cards on landing ---------- */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

@media (max-width: 860px) {
  .tool-grid { grid-template-columns: 1fr; }
}

.tool-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--line);
  padding: 28px;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.tool-card:hover {
  border-color: var(--accent-deep);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.tool-card .tool-num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 18px;
  letter-spacing: 0.05em;
}

.tool-card h3 { margin-bottom: 10px; }
.tool-card p { flex: 1; font-size: 0.95rem; }

.tool-card .tool-link {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.tool-card:hover .tool-link { color: var(--accent-light); }

/* ---------- Forms (calculator inputs) ---------- */
.calc-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: start;
}

@media (max-width: 900px) {
  .calc-layout { grid-template-columns: 1fr; }
}

.field-group {
  margin-bottom: 22px;
}

.field-group legend,
.field-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.field {
  position: relative;
}

.field input[type="number"],
.field input[type="text"],
.field select {
  width: 100%;
  background: var(--bg-elevated);
  border: 1px solid var(--line-bright);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 1rem;
  padding: 12px 14px;
  border-radius: var(--radius);
  appearance: none;
}

.field input:focus,
.field select:focus {
  border-color: var(--accent);
}

.field .unit {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-faint);
  pointer-events: none;
}

.field select {
  padding-right: 34px;
  background-image: linear-gradient(45deg, transparent 50%, var(--ink-faint) 50%),
                     linear-gradient(135deg, var(--ink-faint) 50%, transparent 50%);
  background-position: calc(100% - 18px) center, calc(100% - 13px) center;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
}

.field-help {
  font-size: 0.82rem;
  color: var(--ink-faint);
  margin-top: 6px;
}

fieldset {
  border: none;
  padding: 0;
  margin: 0 0 26px;
}

/* ---------- Results panel ---------- */
.results {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  padding: 28px;
  position: sticky;
  top: 96px;
}

.results h3 {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  margin-bottom: 20px;
}

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  gap: 12px;
}

.result-row:last-of-type { border-bottom: none; }

.result-row .label {
  font-size: 0.92rem;
  color: var(--ink-muted);
}

.result-row .value {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--ink);
  font-weight: 600;
  white-space: nowrap;
}

.result-row.hero-result {
  background: var(--success-bg);
  margin: 4px -28px 4px;
  padding: 18px 28px;
  border-bottom: none;
  border-top: 1px solid var(--line);
  border-left: 3px solid var(--success);
}

.result-row.hero-result .label { color: var(--ink); font-weight: 600; }
.result-row.hero-result .value { color: var(--success); font-size: 1.3rem; }

.results-note {
  margin-top: 18px;
  font-size: 0.82rem;
  color: var(--ink-faint);
  border-top: 1px dashed var(--line-bright);
  padding-top: 14px;
}

.warn-banner {
  display: none;
  background: var(--error-bg);
  border-left: 3px solid var(--error);
  color: var(--ink);
  font-size: 0.88rem;
  padding: 12px 16px;
  margin-bottom: 18px;
}
.warn-banner.show { display: block; }

/* ---------- Page hero (calculator pages) ---------- */
.calc-hero {
  padding: 56px 0 40px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 14px;
  display: block;
}

/* ---------- Footer ---------- */
footer {
  border-top: 1px solid var(--line);
  margin-top: 96px;
  padding: 40px 0 56px;
  color: var(--ink-faint);
  font-size: 0.88rem;
}

footer .wrap {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

/* ---------- Utility ---------- */
.section { padding: 88px 0; }
.section-tight { padding: 56px 0; }
.center { text-align: center; }
.stack-sm > * + * { margin-top: 12px; }