/* ======================================================
   Board Feet Calculator – Global Stylesheet
   Brand: Warm hardwood / forestry workshop aesthetic
   ====================================================== */

:root {
  --color-bg:        #faf6f0;
  --color-bg-alt:    #f1e9dc;
  --color-surface:   #ffffff;
  --color-ink:       #2b1d12;
  --color-ink-soft:  #5a4632;
  --color-muted:     #8a7660;
  --color-rule:      #d9c9b0;
  --color-wood:      #8b4513;
  --color-wood-dark: #5e2d0c;
  --color-wood-soft: #c08552;
  --color-forest:    #3d5a3a;
  --color-forest-dk: #243a22;
  --color-accent:    #c8762a;
  --color-warn:      #b54a1f;
  --color-shadow:    rgba(43,29,18,.08);

  --font-display: "Fraunces", "Playfair Display", Georgia, serif;
  --font-body:    "Inter", "Helvetica Neue", Arial, sans-serif;
  --font-mono:    "JetBrains Mono", "Fira Code", Menlo, monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 18px;

  --shadow-sm: 0 1px 2px var(--color-shadow);
  --shadow-md: 0 4px 16px var(--color-shadow);
  --shadow-lg: 0 16px 40px rgba(43,29,18,.12);

  --container: 1180px;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-ink);
  background: var(--color-bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  background-image:
    radial-gradient(circle at 12% 8%, rgba(192,133,82,.10), transparent 40%),
    radial-gradient(circle at 88% 92%, rgba(61,90,58,.08), transparent 45%);
  background-attachment: fixed;
}

img { max-width: 100%; display: block; }

a {
  color: var(--color-wood-dark);
  text-decoration: none;
  border-bottom: 1px solid rgba(139,69,19,.25);
  transition: color .2s ease, border-color .2s ease;
}
a:hover { color: var(--color-accent); border-color: var(--color-accent); }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--color-ink);
  line-height: 1.2;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 .6em;
}
h1 { font-size: clamp(2rem, 4.2vw, 3.2rem); font-weight: 700; }
h2 { font-size: clamp(1.55rem, 2.6vw, 2.05rem); margin-top: 2.4rem; }
h3 { font-size: clamp(1.2rem, 1.8vw, 1.4rem); margin-top: 1.8rem; }
h4 { font-size: 1.05rem; margin-top: 1.2rem; color: var(--color-ink-soft); }

p { margin: 0 0 1.1em; }

/* ======================================================
   LAYOUT
   ====================================================== */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 22px;
}

.section {
  padding: 64px 0;
  border-top: 1px solid var(--color-rule);
}
.section:first-of-type { border-top: 0; }

.section--tint { background: var(--color-bg-alt); }

/* ======================================================
   HEADER + NAV
   ====================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250,246,240,.92);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--color-rule);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px 0;
}
.logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-ink);
  letter-spacing: -0.01em;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border: 0;
}
.logo-mark {
  width: 32px; height: 32px;
  background: linear-gradient(135deg, var(--color-wood) 0%, var(--color-wood-dark) 100%);
  border-radius: 8px;
  display: inline-grid;
  place-items: center;
  color: #fff7e6;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  box-shadow: inset 0 -2px 4px rgba(0,0,0,.25), 0 2px 4px rgba(0,0,0,.08);
}

.nav-links {
  display: flex;
  gap: 22px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: .95rem;
}
.nav-links a {
  color: var(--color-ink-soft);
  border: 0;
  font-weight: 500;
}
.nav-links a:hover { color: var(--color-wood-dark); }

.lang-switch {
  position: relative;
  display: inline-block;
}
.lang-switch summary {
  list-style: none;
  cursor: pointer;
  padding: 6px 14px;
  border: 1px solid var(--color-rule);
  border-radius: 999px;
  font-size: .85rem;
  background: var(--color-surface);
  color: var(--color-ink-soft);
  font-weight: 500;
}
.lang-switch summary::-webkit-details-marker { display: none; }
.lang-switch[open] summary { border-color: var(--color-wood); color: var(--color-wood-dark); }
.lang-menu {
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  background: var(--color-surface);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  min-width: 180px;
  padding: 6px;
  z-index: 60;
}
.lang-menu a {
  display: block;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: var(--color-ink);
  border: 0;
  font-size: .9rem;
}
.lang-menu a:hover { background: var(--color-bg-alt); color: var(--color-wood-dark); }
.lang-menu .flag { display: inline-block; width: 22px; margin-right: 6px; font-size: 1rem; }

.menu-toggle {
  display: none;
  border: 1px solid var(--color-rule);
  background: var(--color-surface);
  color: var(--color-ink);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  cursor: pointer;
}

/* ======================================================
   HERO
   ====================================================== */
.hero {
  padding: 70px 0 30px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(
      90deg,
      transparent 0 39px,
      rgba(139,69,19,.06) 39px 40px
    );
  mask-image: linear-gradient(to bottom, black 0%, transparent 85%);
  pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; max-width: 880px; }
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--color-wood);
  padding: 6px 12px;
  background: rgba(192,133,82,.12);
  border-radius: 999px;
  margin-bottom: 18px;
}
.hero h1 { margin-bottom: .35em; }
.hero .lead {
  font-size: 1.18rem;
  color: var(--color-ink-soft);
  max-width: 680px;
  margin-bottom: 22px;
}

/* ======================================================
   CALCULATOR WIDGET
   ====================================================== */
.calc {
  background: var(--color-surface);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  margin: 20px 0 40px;
}
.calc-tabs {
  display: flex;
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-rule);
}
.calc-tab {
  flex: 1;
  padding: 16px 18px;
  background: transparent;
  border: 0;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-ink-soft);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: all .2s ease;
}
.calc-tab.is-active {
  color: var(--color-wood-dark);
  background: var(--color-surface);
  border-bottom-color: var(--color-wood);
}
.calc-tab:hover:not(.is-active) { color: var(--color-wood-dark); }

.calc-body { padding: 28px; }
.calc-explainer {
  font-size: .92rem;
  color: var(--color-ink-soft);
  margin-bottom: 20px;
  padding-left: 14px;
  border-left: 3px solid var(--color-wood-soft);
}

.calc-form {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin-bottom: 22px;
}
.calc-field { display: flex; flex-direction: column; }
.calc-field label {
  font-size: .82rem;
  font-weight: 600;
  color: var(--color-ink-soft);
  margin-bottom: 6px;
  letter-spacing: .02em;
}
.calc-field input,
.calc-field select {
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 10px 12px;
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-ink);
  transition: border-color .15s ease, box-shadow .15s ease;
}
.calc-field input:focus,
.calc-field select:focus {
  outline: none;
  border-color: var(--color-wood);
  box-shadow: 0 0 0 3px rgba(192,133,82,.18);
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 12px 22px;
  font-family: var(--font-body);
  font-size: .98rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 0;
  cursor: pointer;
  transition: transform .1s ease, background .2s ease, box-shadow .2s ease;
  text-decoration: none;
}
.btn-primary {
  background: var(--color-wood-dark);
  color: #fff7e6;
  box-shadow: 0 2px 0 var(--color-wood-dark), 0 4px 12px rgba(94,45,12,.25);
}
.btn-primary:hover { background: var(--color-wood); transform: translateY(-1px); }
.btn-primary:active { transform: translateY(1px); box-shadow: none; }
.btn-ghost {
  background: transparent;
  color: var(--color-ink-soft);
  border: 1px solid var(--color-rule);
  margin-left: 8px;
}
.btn-ghost:hover { background: var(--color-bg-alt); color: var(--color-ink); }

.calc-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: space-between;
}

.calc-result {
  margin-top: 26px;
  padding: 22px;
  background: linear-gradient(135deg, #fffaf2, #f7ecd9);
  border: 1px solid var(--color-wood-soft);
  border-radius: var(--radius-md);
}
.calc-result-headline {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--color-wood-dark);
  margin: 0;
  letter-spacing: -.01em;
}
.calc-result-unit {
  font-family: var(--font-mono);
  font-size: .9rem;
  color: var(--color-ink-soft);
  text-transform: uppercase;
  letter-spacing: .14em;
  margin-top: 4px;
}
.calc-result-detail {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin-top: 16px;
  font-size: .92rem;
}
.calc-result-detail div {
  background: rgba(255,255,255,.5);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
}
.calc-result-detail strong { display: block; color: var(--color-ink-soft); font-size: .78rem; font-weight: 600; text-transform: uppercase; letter-spacing: .08em; margin-bottom: 3px; }

/* Multi-board batch list */
.batch-list { list-style: none; padding: 0; margin: 14px 0 0; }
.batch-list li {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr auto;
  gap: 8px;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px dashed var(--color-rule);
  font-size: .92rem;
}
.batch-remove {
  background: transparent;
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-sm);
  width: 26px; height: 26px;
  cursor: pointer;
  color: var(--color-warn);
  font-size: 1rem;
  line-height: 1;
}
.batch-remove:hover { background: var(--color-warn); color: #fff; border-color: var(--color-warn); }

/* ======================================================
   CONTENT BLOCKS
   ====================================================== */
.prose { max-width: 880px; }
.prose ul, .prose ol { padding-left: 1.3em; margin: 0 0 1.1em; }
.prose li { margin: .35em 0; }

.callout {
  border-left: 4px solid var(--color-forest);
  background: #f0efe5;
  padding: 14px 18px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 22px 0;
  font-size: .95rem;
  color: var(--color-forest-dk);
}
.callout strong { color: var(--color-forest-dk); }

.formula {
  font-family: var(--font-mono);
  background: #2b1d12;
  color: #fff7e6;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  display: block;
  margin: 14px 0;
  font-size: 1rem;
  overflow-x: auto;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-rule);
  padding: 24px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform .2s ease, box-shadow .2s ease;
}
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.card h3 { margin-top: 0; }

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 4px;
  background: var(--color-bg-alt);
  color: var(--color-ink-soft);
  margin-bottom: 8px;
}
.tag--wood { background: rgba(192,133,82,.18); color: var(--color-wood-dark); }
.tag--forest { background: rgba(61,90,58,.16); color: var(--color-forest-dk); }

/* Comparison table */
.table-wrap { overflow-x: auto; margin: 18px 0; }
.t {
  width: 100%;
  border-collapse: collapse;
  font-size: .94rem;
}
.t th, .t td {
  padding: 11px 14px;
  text-align: left;
  border-bottom: 1px solid var(--color-rule);
}
.t th {
  background: var(--color-bg-alt);
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--color-ink);
  font-size: .9rem;
}
.t tr:hover td { background: rgba(192,133,82,.06); }
.t caption { caption-side: bottom; font-size: .82rem; color: var(--color-muted); padding-top: 8px; text-align: left; }

/* FAQ accordion */
.faq details {
  border-bottom: 1px solid var(--color-rule);
  padding: 16px 0;
}
.faq details:last-of-type { border-bottom: 0; }
.faq summary {
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.08rem;
  color: var(--color-ink);
  padding-right: 30px;
  position: relative;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  position: absolute;
  right: 0; top: 0;
  font-size: 1.4rem;
  color: var(--color-wood);
  font-weight: 400;
  transition: transform .25s ease;
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details > *:not(summary) { margin-top: 10px; color: var(--color-ink-soft); }

/* ======================================================
   FOOTER
   ====================================================== */
.site-footer {
  background: #1f1610;
  color: #d2c4ad;
  padding: 56px 0 28px;
  margin-top: 80px;
}
.site-footer a { color: #f0d8a8; border-color: rgba(240,216,168,.25); }
.site-footer a:hover { color: #ffd28a; border-color: #ffd28a; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 36px;
  margin-bottom: 36px;
}
.footer-brand .logo { color: #f0d8a8; }
.footer-brand .logo-mark { background: linear-gradient(135deg, var(--color-wood-soft), var(--color-wood)); }
.footer-brand p { color: #a89478; font-size: .92rem; margin-top: 12px; }

.footer-col h4 {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: #f0d8a8;
  margin: 0 0 14px;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; font-size: .92rem; }
.footer-col li { margin: 8px 0; }

.footer-bottom {
  border-top: 1px solid rgba(240,216,168,.15);
  padding-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  font-size: .84rem;
  color: #a89478;
}

/* ======================================================
   PAGE TYPES
   ====================================================== */
.page-head {
  padding: 60px 0 30px;
  border-bottom: 1px solid var(--color-rule);
}
.page-head h1 { margin-bottom: .25em; }
.page-head .lead { font-size: 1.1rem; color: var(--color-ink-soft); max-width: 680px; }

/* 404 page */
.err-page {
  min-height: 60vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 60px 22px;
}
.err-code {
  font-family: var(--font-display);
  font-size: clamp(6rem, 18vw, 12rem);
  line-height: 1;
  color: var(--color-wood);
  margin: 0;
  letter-spacing: -0.04em;
}
.err-page h2 { margin-top: 10px; }
.err-page p { color: var(--color-ink-soft); max-width: 520px; margin-left: auto; margin-right: auto; }

/* Contact form */
.form-stack { display: grid; gap: 14px; max-width: 560px; }
.form-stack label { display: flex; flex-direction: column; font-size: .88rem; color: var(--color-ink-soft); font-weight: 600; }
.form-stack input, .form-stack textarea {
  margin-top: 6px;
  font-family: inherit; font-size: 1rem;
  padding: 10px 12px;
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-ink);
}
.form-stack input:focus, .form-stack textarea:focus {
  outline: none;
  border-color: var(--color-wood);
  box-shadow: 0 0 0 3px rgba(192,133,82,.18);
}
.form-stack textarea { resize: vertical; min-height: 120px; }

/* Sitemap visual */
.sitemap-tree ul { list-style: none; padding-left: 18px; border-left: 2px solid var(--color-rule); }
.sitemap-tree li { padding: 4px 0; }
.sitemap-tree > ul { padding-left: 0; border-left: 0; }

/* ======================================================
   RESPONSIVE
   ====================================================== */
@media (max-width: 880px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .menu-toggle { display: inline-block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-rule);
    padding: 14px 22px;
    gap: 14px;
  }
  .nav-links.is-open { display: flex; }
  .nav { position: relative; flex-wrap: wrap; }

  .hero { padding: 40px 0 20px; }
  .section { padding: 44px 0; }

  .batch-list li {
    grid-template-columns: 1fr 1fr;
    gap: 6px;
    padding: 12px 0;
  }
  .batch-list li > * { font-size: .88rem; }

  .footer-grid { grid-template-columns: 1fr; gap: 26px; }
  .footer-bottom { flex-direction: column; gap: 8px; }
}
@media (max-width: 480px) {
  .calc-body { padding: 18px; }
  .calc-tab { font-size: .92rem; padding: 12px 10px; }
  .calc-result-headline { font-size: 1.6rem; }
}

/* Print */
@media print {
  .site-header, .site-footer, .calc-actions, .menu-toggle { display: none; }
  body { background: white; }
  .calc { box-shadow: none; border: 1px solid #ccc; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}