:root {
  --cream: #f7f5ef;
  --page-bg: #c98a7d;
  --text-page: #faf6f3;
  --text-page-soft: #f2ded6;
  --border-page: #b17567;
  --card: #ffffff;
  --terracotta: #6b8e6e;
  --terracotta-dark: #4f6f52;
  --sage: #c9a66b;
  --ink: #33362f;
  --ink-soft: #6f6a5e;
  --border: #e2ded2;
  --yarn: #f3d977;
  --yarn-dark: #c9a53f;
  --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(--terracotta-dark); }
a:hover { color: var(--terracotta); }

.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(--text-page);
  text-decoration: underline;
  text-decoration-style: wavy;
  text-decoration-color: var(--yarn-dark);
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

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

.yarn-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(--text-page); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--text-page);
  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; }

.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;
}

.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 {
  width: 100%;
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  background: var(--cream);
  color: var(--ink);
  font-family: inherit;
}

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

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

.result {
  margin-top: 1.5rem;
  padding: 1.25rem;
  border-radius: 10px;
  background: #eef0e5;
  border: 1px solid var(--border);
  display: none;
}

.result.visible { display: block; }

.result .big {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--terracotta-dark);
}

.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;
}

.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;
}

.tool-card:hover {
  border-color: var(--terracotta);
  transform: translateY(-2px);
}

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

.tool-card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  color: var(--terracotta-dark);
}

.tool-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.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(--text-page); }

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; }
}