:root {
  --page-bg: #faf3ea;
  --text-page: #4a3728;
  --text-page-soft: #8a7360;
  --border-page: #ede2d3;
  --card: #ffffff;
  --primary: #c17f4e;
  --primary-dark: #a3663a;
  --accent: #e0a458;
  --ink: #3d2f24;
  --ink-soft: #6b5847;
  --border: #ede2d3;
  --radius: 14px;
  --max-width: 880px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--page-bg);
  color: var(--text-page);
  line-height: 1.6;
}

a { color: var(--primary-dark); }
a:hover { color: var(--primary); }

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

header.site-header {
  border-bottom: 1px solid var(--border-page);
  background: var(--page-bg);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.9rem;
  padding-bottom: 0.9rem;
}

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--ink);
  text-decoration: underline;
  text-decoration-style: solid;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.logo span { color: var(--primary); }

.wheat-icon { flex-shrink: 0; }

nav.main-nav {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

nav.main-nav a {
  text-decoration: none;
  color: var(--text-page-soft);
  font-size: 0.95rem;
  font-weight: 500;
}

nav.main-nav a:hover { color: var(--ink); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--ink);
  cursor: pointer;
  padding: 0.25rem 0.5rem;
}

@media (max-width: 768px) {
  .nav-toggle { display: block; }

  nav.main-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 0;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--page-bg);
    border-top: 1px solid var(--border-page);
    border-bottom: 1px solid var(--border-page);
  }

  nav.main-nav.open { display: flex; }

  nav.main-nav a {
    padding: 0.85rem 1.25rem;
    border-bottom: 1px solid var(--border-page);
  }

  nav.main-nav a:last-child { border-bottom: none; }
}

main { padding: 2.5rem 0 4rem; }

h1 { font-size: 1.9rem; margin: 0 0 0.5rem; line-height: 1.25; }
h2 { font-size: 1.3rem; margin: 2rem 0 0.75rem; color: var(--ink); }

.tool-subsection {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-page-soft);
  margin: 1.75rem 0 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.tool-grid:first-of-type,
.tool-subsection:first-of-type { margin-top: 1rem; }

.subtitle {
  color: var(--text-page-soft);
  font-size: 1.05rem;
  margin: 0 0 2rem;
  max-width: 60ch;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  margin-bottom: 1.5rem;
  color: var(--ink);
  box-shadow: 0 1px 3px rgba(74, 55, 40, 0.04);
}

.card h2 { color: var(--ink); margin-top: 0; }

.field-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem 1.25rem;
  margin-bottom: 1.25rem;
}

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--ink);
}

.hint { font-size: 0.8rem; color: var(--ink-soft); margin-top: 0.25rem; }

input[type="number"], input[type="text"], select, textarea {
  width: 100%;
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  background: #fffdf9;
  color: var(--ink);
  font-family: inherit;
}

input::placeholder, textarea::placeholder { color: #b3a08c; }

input:focus, select:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

button.calc-btn {
  background: var(--primary);
  color: white;
  border: none;
  padding: 0.7rem 1.4rem;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

button.calc-btn:hover { background: var(--primary-dark); }

.result {
  margin-top: 1.5rem;
  padding: 1.25rem;
  border-radius: 10px;
  background: #fbf1e4;
  border: 1px solid var(--border);
  color: var(--ink);
  display: none;
}

.result.visible { display: block; }
.result .big { font-size: 1.6rem; font-weight: 700; color: var(--primary-dark); }
.result .hint { color: var(--ink-soft); }

.result table { width: 100%; border-collapse: collapse; margin-top: 0.75rem; }
.result th, .result td { text-align: left; padding: 0.35rem 0.5rem; border-bottom: 1px solid var(--border); font-size: 0.92rem; }

.card table { width: 100%; border-collapse: collapse; margin-top: 1rem; }
.card table th, .card table td { text-align: left; padding: 0.6rem 0.8rem; border-bottom: 1px solid var(--border); font-size: 0.92rem; }
.card table th {
  background: #fbf1e4;
  color: var(--primary-dark);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  border-bottom: 2px solid var(--border);
}
.card table tr:nth-child(even) td { background: rgba(193, 127, 78, 0.05); }

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.tool-card {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-decoration: none;
  color: var(--ink);
  transition: border-color 0.15s ease, transform 0.15s ease;
  box-shadow: 0 1px 3px rgba(74, 55, 40, 0.04);
}

.tool-card:hover { border-color: var(--primary); transform: translateY(-2px); }
.tool-card h3 { margin: 0 0 0.4rem; font-size: 1.05rem; color: var(--primary-dark); }
.tool-card p { margin: 0; font-size: 0.9rem; color: var(--ink-soft); }

.ad-slot {
  max-width: var(--max-width);
  margin: 1.5rem auto;
  padding: 0 1.25rem;
  min-height: 1px;
  text-align: center;
}

.explainer {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-page);
  color: var(--text-page-soft);
  font-size: 0.95rem;
}

.explainer h2 { color: var(--ink); }

footer.site-footer {
  border-top: 1px solid var(--border-page);
  padding: 2rem 0;
  color: var(--text-page-soft);
  font-size: 0.85rem;
  text-align: center;
}

footer.site-footer a { color: var(--text-page-soft); text-decoration: underline; }

@media (max-width: 600px) {
  h1 { font-size: 1.5rem; }
  .card { padding: 1.25rem; }
  .card table th, .card table td { padding: 0.5rem 0.4rem; font-size: 0.82rem; }
}