:root {
  --ink: #1f2937;
  --ink-soft: #4b5563;
  --brand: #b45309;
  --brand-dark: #92400e;
  --bg: #faf9f7;
  --card: #ffffff;
  --line: #e5e1da;
  --accent-bg: #fef3e2;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
}
header {
  background: var(--card);
  border-bottom: 1px solid var(--line);
  padding: 0.9rem 1.25rem;
}
.header-inner {
  max-width: 960px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem;
}
.logo { font-weight: 800; font-size: 1.25rem; color: var(--brand-dark); text-decoration: none; }
.logo span { color: var(--ink); }
nav a { color: var(--ink-soft); text-decoration: none; margin-left: 1.1rem; font-size: 0.95rem; }
nav a:hover { color: var(--brand); }
main { max-width: 960px; margin: 0 auto; padding: 2rem 1.25rem 3rem; }
h1 { font-size: 1.9rem; line-height: 1.25; margin-bottom: 0.5rem; }
.subtitle { color: var(--ink-soft); margin-bottom: 1.75rem; font-size: 1.05rem; }
h2 { font-size: 1.35rem; margin: 2rem 0 0.75rem; }
h3 { font-size: 1.1rem; margin: 1.4rem 0 0.5rem; }
p { margin-bottom: 0.9rem; }
ul, ol { margin: 0 0 0.9rem 1.4rem; }
li { margin-bottom: 0.35rem; }
.calc-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.5rem;
  margin: 1.25rem 0 2rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}
.calc-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1rem; }
.field label { display: block; font-weight: 600; font-size: 0.9rem; margin-bottom: 0.3rem; }
.field input, .field select {
  width: 100%; padding: 0.55rem 0.7rem;
  border: 1px solid var(--line); border-radius: 8px;
  font-size: 1rem; background: #fff; color: var(--ink);
}
.field input:focus, .field select:focus { outline: 2px solid var(--brand); outline-offset: 1px; border-color: var(--brand); }
.calc-btn {
  margin-top: 1.2rem; width: 100%;
  background: var(--brand); color: #fff; border: none;
  padding: 0.75rem; font-size: 1.05rem; font-weight: 700;
  border-radius: 8px; cursor: pointer;
}
.calc-btn:hover { background: var(--brand-dark); }
.result {
  margin-top: 1.2rem; padding: 1.1rem 1.25rem;
  background: var(--accent-bg); border-radius: 8px;
  border: 1px solid #f5d9a8; display: none;
}
.result.show { display: block; }
.result .big { font-size: 1.5rem; font-weight: 800; color: var(--brand-dark); }
.result .note { font-size: 0.9rem; color: var(--ink-soft); margin-top: 0.4rem; }
.tool-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1.1rem; margin-top: 1.5rem; }
.tool-card {
  display: block; background: var(--card); border: 1px solid var(--line);
  border-radius: 12px; padding: 1.25rem; text-decoration: none; color: var(--ink);
  transition: box-shadow 0.15s, transform 0.15s;
}
.tool-card:hover { box-shadow: 0 4px 12px rgba(0,0,0,0.08); transform: translateY(-2px); }
.tool-card .emoji { font-size: 1.8rem; }
.tool-card h3 { margin: 0.5rem 0 0.3rem; color: var(--brand-dark); }
.tool-card p { color: var(--ink-soft); font-size: 0.92rem; margin: 0; }
.faq details {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 8px; padding: 0.85rem 1.1rem; margin-bottom: 0.6rem;
}
.faq summary { font-weight: 600; cursor: pointer; }
.faq details p { margin: 0.6rem 0 0; color: var(--ink-soft); }
.affiliate-note {
  font-size: 0.82rem; color: var(--ink-soft);
  border-top: 1px solid var(--line); margin-top: 2.5rem; padding-top: 0.8rem;
}
footer {
  border-top: 1px solid var(--line); background: var(--card);
  padding: 1.5rem 1.25rem; text-align: center;
  color: var(--ink-soft); font-size: 0.9rem;
}
footer a { color: var(--ink-soft); margin: 0 0.5rem; }
table { border-collapse: collapse; width: 100%; margin: 0 0 1rem; }
th, td { border: 1px solid var(--line); padding: 0.5rem 0.75rem; text-align: left; font-size: 0.95rem; }
th { background: var(--accent-bg); }
@media (max-width: 600px) {
  h1 { font-size: 1.5rem; }
  nav a { margin-left: 0.7rem; font-size: 0.88rem; }
}