:root {
  --bg: #f6f2eb;
  --card: #ffffff;
  --ink: #1f2933;
  --muted: #657384;
  --green: #2f6f5b;
  --green-dark: #255846;
  --border: #ddd7ce;
  --tan: #e9e1d3;
  --shadow: 0 18px 40px rgba(31, 41, 51, 0.08);
}

* { box-sizing: border-box; }

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

.site-header {
  padding: 22px clamp(20px, 5vw, 56px);
  border-bottom: 1px solid var(--border);
  background: rgba(246, 242, 235, 0.92);
}

.site-name {
  color: var(--ink);
  text-decoration: none;
  font-weight: 800;
  font-size: 1.15rem;
}

main { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }

.hero { padding: clamp(48px, 8vw, 90px) 0 clamp(30px, 5vw, 60px); }

.eyebrow {
  margin: 0 0 18px;
  color: var(--green);
  font-size: 0.95rem;
  letter-spacing: 0.15em;
  font-weight: 900;
  text-transform: uppercase;
}

h1 {
  max-width: 850px;
  margin: 0;
  font-size: clamp(3rem, 8vw, 5.8rem);
  line-height: 0.95;
  letter-spacing: -0.07em;
}

.hero-text {
  max-width: 760px;
  margin: 32px 0 0;
  color: var(--muted);
  font-size: clamp(1.25rem, 2.6vw, 2rem);
  line-height: 1.45;
}

.calculator-card, .content-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 32px;
  box-shadow: var(--shadow);
  padding: clamp(24px, 5vw, 52px);
  margin: 0 0 42px;
}

h2 {
  margin: 0 0 24px;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.1;
  letter-spacing: -0.045em;
}

h3 { margin: 0 0 14px; font-size: 1.5rem; line-height: 1.15; }

form { display: grid; gap: 18px; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }

label, legend { font-weight: 850; font-size: 1.05rem; }

input[type="number"], select {
  width: 100%;
  padding: 17px 18px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: #fff;
  color: var(--ink);
  font-size: 1rem;
}

fieldset {
  margin: 10px 0 0;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 24px;
}

legend { padding: 0 10px; }

.checkbox-row {
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: 14px;
  align-items: start;
  margin: 16px 0;
  font-weight: 750;
}

input[type="checkbox"] { width: 20px; height: 20px; margin-top: 4px; accent-color: var(--green); }

button {
  width: 100%;
  margin-top: 16px;
  padding: 20px;
  border: 0;
  border-radius: 22px;
  background: var(--green);
  color: #fff;
  font-size: 1.12rem;
  font-weight: 900;
  cursor: pointer;
}

button:hover, button:focus { background: var(--green-dark); }

.result-card {
  margin-top: 28px;
  padding: 28px;
  border-radius: 24px;
  background: var(--tan);
}

.result-card h3 { font-size: clamp(1.5rem, 3vw, 2.1rem); }
.result-card p { margin: 14px 0; }
.result-card ul { margin-bottom: 0; }
.hidden { display: none; }

.content-card p, .content-card li { color: var(--ink); font-size: clamp(1.05rem, 2vw, 1.25rem); }
.content-card ul { padding-left: 1.4rem; }

.note-box {
  margin-top: 30px;
  padding: 28px;
  border-radius: 26px;
  background: var(--tan);
}

details { border-top: 1px solid var(--border); padding: 20px 0; }
details:last-child { border-bottom: 1px solid var(--border); }
summary { cursor: pointer; font-weight: 900; font-size: clamp(1.15rem, 2vw, 1.45rem); }

footer {
  width: min(1120px, calc(100% - 40px));
  margin: 20px auto 60px;
  color: var(--muted);
  font-size: 0.95rem;
}

footer a { color: var(--green); font-weight: 800; }

@media (max-width: 720px) {
  main, footer { width: min(100% - 32px, 1120px); }
  .site-header { padding: 18px; }
  .calculator-card, .content-card { border-radius: 26px; padding: 26px 22px; }
  .grid-2 { grid-template-columns: 1fr; }
  fieldset { padding: 18px; }
  .checkbox-row { grid-template-columns: 22px 1fr; gap: 12px; }
}