:root {
  --paper: #f5f0e8;
  --paper-deep: #e9dfd3;
  --ink: #18322f;
  --ink-soft: #4f625e;
  --forest: #193d37;
  --forest-light: #2f5d55;
  --wine: #7c433f;
  --line: rgba(24, 50, 47, 0.16);
  --white: #fffdf9;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink-soft);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
h1, h2, h3, p, dl { margin-top: 0; }
h1, h2, h3 { color: var(--ink); font-family: Georgia, "Times New Roman", serif; font-weight: 500; line-height: 1.08; letter-spacing: -0.025em; }
button, input, a { -webkit-tap-highlight-color: transparent; }
.page { min-height: 100vh; background: radial-gradient(circle at 88% 6%, rgba(47, 93, 85, 0.09), transparent 29rem), var(--paper); }
.shell { width: min(100% - 68px, 1112px); margin-inline: auto; }

.header {
  position: sticky;
  top: 0;
  z-index: 10;
  min-height: 78px;
  padding: 14px clamp(20px, 5vw, 80px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  border-bottom: 1px solid var(--line);
  background: rgba(245, 240, 232, 0.94);
  backdrop-filter: blur(14px);
}
.brand { display: flex; flex-direction: column; line-height: 1.2; }
.brand span { color: var(--ink); font-family: Georgia, serif; font-size: 1.2rem; }
.brand small { margin-top: 4px; color: var(--ink-soft); font-size: 0.68rem; letter-spacing: 0.12em; text-transform: uppercase; }
.header nav { display: flex; gap: 22px; color: var(--ink); font-size: 0.88rem; }
.header nav a { padding: 8px 0; border-bottom: 1px solid transparent; }
.header nav a:hover, .header nav a[aria-current="page"] { border-color: var(--wine); }

.hero { padding-block: clamp(54px, 8vw, 88px) 46px; }
.kicker { margin-bottom: 16px; color: var(--wine); font-size: 0.74rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; }
.hero h1 { max-width: 900px; margin-bottom: 24px; font-size: clamp(3rem, 6vw, 4.9rem); }
.hero .lead { max-width: 760px; margin-bottom: 0; font-size: 1.1rem; line-height: 1.7; }

.calculator {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  margin-bottom: 90px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--white);
  box-shadow: 0 24px 80px rgba(24, 50, 47, 0.08);
  overflow: hidden;
}
.calculator-form { padding: clamp(30px, 5vw, 58px); }
.calculator-form h2 { margin-bottom: 14px; font-size: clamp(2rem, 3.5vw, 3.2rem); }
.form-intro { margin-bottom: 32px; }
.fields { display: grid; gap: 22px; }
.fields label { display: grid; gap: 9px; color: var(--ink); font-size: 0.9rem; font-weight: 700; }
.input-wrap { position: relative; display: block; }
.input-wrap input {
  width: 100%;
  height: 58px;
  padding: 10px 58px 10px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  outline: none;
  background: var(--paper);
  color: var(--ink);
  font: inherit;
  font-size: 1rem;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}
.input-wrap input:focus { border-color: var(--forest-light); box-shadow: 0 0 0 3px rgba(47, 93, 85, 0.13); }
.input-wrap small { position: absolute; top: 50%; right: 17px; transform: translateY(-50%); color: var(--ink-soft); font-size: 0.8rem; font-weight: 500; }
.error { margin: 18px 0 0; padding: 12px 14px; border-left: 3px solid var(--wine); background: rgba(124, 67, 63, 0.07); color: var(--wine); font-size: 0.88rem; }
.actions { display: flex; align-items: center; gap: 18px; margin-top: 28px; }
.actions button {
  min-height: 52px;
  padding: 12px 24px;
  border: 1px solid var(--forest);
  border-radius: 999px;
  background: var(--forest);
  color: var(--white);
  font: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
}
.actions .reset { padding-inline: 4px; border-color: transparent; background: transparent; color: var(--wine); }

.calculator-result { min-height: 570px; padding: clamp(30px, 5vw, 58px); display: flex; scroll-margin-top: 90px; background: var(--forest); color: rgba(255, 255, 255, 0.76); outline: none; }
.placeholder { margin: auto 0; }
.placeholder > span { display: block; margin-bottom: 25px; color: #d8b9aa; font-size: 0.75rem; font-weight: 700; letter-spacing: 0.17em; }
.placeholder h2 { max-width: 440px; margin-bottom: 18px; color: var(--white); font-size: clamp(2.15rem, 4vw, 3.5rem); }
.placeholder p { max-width: 470px; margin: 0; }
.result-content { width: 100%; display: flex; flex-direction: column; }
.result-label { margin-bottom: 8px; color: #d8b9aa; font-size: 0.72rem; font-weight: 700; letter-spacing: 0.13em; text-transform: uppercase; }
.result-total { margin-bottom: 27px; color: var(--white); font-family: Georgia, serif; font-size: clamp(3.8rem, 7vw, 6.4rem); line-height: 1; letter-spacing: -0.045em; }
.result-total small { font-family: Inter, sans-serif; font-size: 1rem; letter-spacing: 0; }
.bmi-row { display: grid; grid-template-columns: 1fr auto; gap: 4px 20px; padding: 20px 0; border-top: 1px solid rgba(255,255,255,0.18); border-bottom: 1px solid rgba(255,255,255,0.18); }
.bmi-row span { font-size: 0.82rem; }
.bmi-row strong { grid-row: span 2; align-self: center; color: var(--white); font-family: Georgia, serif; font-size: 2.25rem; font-weight: 500; }
.bmi-row p { margin: 0; color: var(--white); font-weight: 700; }
.result-details { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 22px 0 0; }
.result-details dt { margin-bottom: 5px; color: #d8b9aa; font-size: 0.72rem; font-weight: 700; letter-spacing: 0.09em; text-transform: uppercase; }
.result-details dd { margin: 0; color: var(--white); font-size: 0.95rem; }
.result-note { margin: 25px 0 20px; font-size: 0.83rem; line-height: 1.55; }
.contact-link { display: flex; justify-content: space-between; gap: 20px; margin-top: auto; padding-top: 16px; border-top: 1px solid rgba(255,255,255,0.18); color: var(--white); font-size: 0.9rem; font-weight: 700; }

.explanation { margin-bottom: 78px; padding: 58px; display: grid; grid-template-columns: minmax(260px, 0.72fr) minmax(0, 1.28fr); gap: clamp(45px, 8vw, 100px); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.explanation h2, .related h2, .section-heading h2 { margin-bottom: 0; font-size: clamp(2.2rem, 4vw, 3.6rem); }
.explanation-copy > p { margin-bottom: 20px; }
.caution { margin-top: 28px; padding: 20px 22px; border-left: 2px solid var(--wine); background: rgba(124, 67, 63, 0.06); color: var(--ink); font-size: 0.9rem; }
.related { margin-bottom: 70px; padding: 34px; display: grid; grid-template-columns: 1fr auto; align-items: end; gap: 44px; border: 1px solid var(--line); border-radius: 18px; background: rgba(255,253,249,0.7); }
.related h2 { margin-bottom: 14px; }
.related p:last-child { max-width: 720px; margin-bottom: 0; }
.related-link { display: flex; align-items: center; gap: 22px; padding: 14px 18px; border-radius: 999px; background: var(--forest); color: var(--white); font-size: 0.88rem; font-weight: 700; white-space: nowrap; }
.source { margin-bottom: 64px; display: flex; align-items: flex-start; justify-content: space-between; gap: 40px; font-size: 0.82rem; }
.source p { max-width: 760px; margin: 0; }
.source a { flex: 0 0 auto; color: var(--wine); font-weight: 700; }
.footer { padding-block: 34px; display: flex; justify-content: space-between; gap: 35px; border-top: 1px solid var(--line); font-size: 0.78rem; }
.footer p { max-width: 760px; margin: 0; line-height: 1.55; }
.footer a { color: var(--wine); font-weight: 700; }

.tests-hero { padding-bottom: 58px; }
.tests-section { padding-bottom: 90px; }
.section-heading { margin-bottom: 28px; }
.section-heading .kicker { margin-bottom: 12px; }
.test-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.test-card { min-height: 330px; padding: 34px; display: flex; flex-direction: column; border: 1px solid var(--line); border-radius: 18px; background: rgba(255,253,249,0.78); box-shadow: 0 18px 54px rgba(24,50,47,0.055); transition: transform 160ms ease, background 160ms ease; }
.test-card.tinted { background: var(--paper-deep); }
.test-card > span { margin-bottom: 30px; color: var(--wine); font-size: 0.72rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; }
.test-card h3 { margin-bottom: 14px; font-size: clamp(1.8rem, 3vw, 2.2rem); }
.test-card p { margin-bottom: 24px; }
.test-card strong { margin-top: auto; display: flex; justify-content: space-between; padding-top: 18px; border-top: 1px solid var(--line); color: var(--forest); }
.test-card:hover { background: var(--white); transform: translateY(-3px); }

@media (max-width: 760px) {
  body { font-size: 15px; }
  .shell { width: min(100% - 40px, 1112px); }
  .header { min-height: 76px; padding: 14px 20px; align-items: flex-start; flex-direction: column; gap: 7px; }
  .brand span { font-size: 1.05rem; }
  .header nav { gap: 18px; font-size: 0.82rem; }
  .hero { padding-block: 50px 36px; }
  .hero h1 { font-size: clamp(2.65rem, 13vw, 4rem); }
  .hero .lead { font-size: 1rem; }
  .calculator { grid-template-columns: 1fr; margin-bottom: 64px; border-radius: 18px; }
  .calculator-form, .calculator-result { padding: 28px 23px; }
  .calculator-result { min-height: 440px; }
  .actions { align-items: stretch; flex-direction: column; }
  .actions button { width: 100%; }
  .actions .reset { min-height: 36px; }
  .result-total { font-size: clamp(3.5rem, 18vw, 5rem); }
  .result-details { grid-template-columns: 1fr; }
  .explanation { padding: 42px 0; grid-template-columns: 1fr; gap: 30px; }
  .related { padding: 25px 22px; grid-template-columns: 1fr; align-items: stretch; gap: 28px; }
  .related-link { justify-content: space-between; border-radius: 14px; white-space: normal; }
  .source, .footer { flex-direction: column; gap: 16px; }
  .test-grid { grid-template-columns: 1fr; }
  .test-card { min-height: 290px; padding: 27px 23px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}