:root {
  --bg: #f7f3eb;
  --surface: rgba(255, 255, 255, 0.82);
  --surface-strong: #fffdf9;
  --text: #1b1712;
  --muted: #65584a;
  --line: rgba(69, 53, 37, 0.12);
  --brand: #c35b2a;
  --brand-dark: #93421d;
  --accent: #efe2cf;
  --shadow: 0 20px 60px rgba(92, 62, 36, 0.12);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Manrope", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(248, 191, 131, 0.42), transparent 30%),
    radial-gradient(circle at top right, rgba(198, 91, 42, 0.18), transparent 24%),
    linear-gradient(180deg, #f7f3eb 0%, #f3ede2 100%);
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
}

.page-shell {
  width: min(calc(100% - 32px), var(--max-width));
  margin: 0 auto;
  padding: 24px 0 48px;
}

.hero {
  display: flex;
  justify-content: center;
  padding: 32px 0 20px;
}

.calculator-card,
.results-section,
.content-section,
.faq-section,
.site-footer,
.ad-slot {
  border: 1px solid var(--line);
  background: var(--surface);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
}

.results-section,
.content-section,
.faq-section,
.site-footer {
  border-radius: var(--radius-lg);
}

.eyebrow {
  margin: 0 0 14px;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--brand-dark);
}

h1,
h2,
h3 {
  margin: 0;
  font-family: "Fraunces", serif;
  line-height: 1.02;
}

h1 {
  font-size: clamp(2.7rem, 5vw, 4.8rem);
  max-width: 12ch;
}

h2 {
  font-size: clamp(2rem, 3vw, 2.9rem);
}

h3 {
  font-size: 1.35rem;
  margin-bottom: 10px;
}

.calculator-card {
  border-radius: 34px;
  padding: 26px;
  width: min(100%, 760px);
}

.card-top p,
.section-heading p,
.result-note,
.field-hint,
.site-footer p,
.ad-slot span,
.content-stack p,
.faq-list p,
.content-grid p {
  color: var(--muted);
}

.card-top p {
  margin: 8px 0 0;
}

.unit-toggle {
  display: inline-grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  padding: 6px;
  margin: 22px 0 18px;
  border-radius: 999px;
  background: #efe5d7;
}

.unit-btn {
  border: 0;
  background: transparent;
  border-radius: 999px;
  padding: 10px 18px;
  font-weight: 800;
  cursor: pointer;
  color: var(--muted);
}

.unit-btn.is-active {
  background: white;
  color: var(--text);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.field {
  display: grid;
  gap: 8px;
}

.field-wide {
  grid-column: 1 / -1;
}

.field span {
  font-size: 0.95rem;
  font-weight: 800;
}

.field input,
.field select {
  width: 100%;
  border: 1px solid rgba(69, 53, 37, 0.18);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  font: inherit;
  background: rgba(255, 255, 255, 0.86);
  color: var(--text);
}

.field input::placeholder {
  color: rgba(101, 88, 74, 0.58);
}

.field em {
  font-style: normal;
  color: var(--muted);
  font-weight: 600;
}

.field input:focus,
.field select:focus,
.primary-btn:focus,
.unit-btn:focus {
  outline: 2px solid rgba(195, 91, 42, 0.3);
  outline-offset: 2px;
}

.split-fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.is-hidden {
  display: none;
}

.primary-btn {
  width: 100%;
  margin-top: 18px;
  border: 0;
  border-radius: 16px;
  padding: 16px 20px;
  font: inherit;
  font-weight: 800;
  color: white;
  cursor: pointer;
  background: linear-gradient(135deg, var(--brand) 0%, #da7b37 100%);
  box-shadow: 0 18px 35px rgba(195, 91, 42, 0.28);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.primary-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 20px 40px rgba(195, 91, 42, 0.33);
}

.form-error {
  min-height: 1.4rem;
  margin: 12px 2px 0;
  color: #a02222;
  font-size: 0.92rem;
}

main {
  display: grid;
  gap: 24px;
}

.results-section,
.content-section,
.faq-section,
.site-footer {
  padding: 28px;
}

.results-section {
  scroll-margin-top: 18px;
}

.section-heading {
  display: grid;
  gap: 8px;
  margin-bottom: 22px;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.result-box {
  padding: 20px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--line);
}

.result-box.emphasis {
  background: linear-gradient(180deg, #fff7ee 0%, #fffdf9 100%);
}

.result-label {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--brand-dark);
}

.result-value {
  margin: 14px 0 10px;
  font-family: "Fraunces", serif;
  font-size: clamp(2rem, 3vw, 2.8rem);
}

.result-note {
  margin: 0;
  line-height: 1.5;
}

.ad-slot {
  border-radius: 24px;
  padding: 26px 28px;
  text-align: center;
  border-style: dashed;
}

.ad-slot p {
  margin: 0 0 8px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.content-grid article,
.content-stack,
.faq-list details {
  padding: 22px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--line);
}

.content-grid p,
.content-stack p,
.faq-list p {
  margin: 0;
  line-height: 1.7;
}

.content-stack {
  display: grid;
  gap: 16px;
}

.accent {
  background:
    linear-gradient(180deg, rgba(255, 247, 234, 0.88), rgba(255, 253, 248, 0.92)),
    var(--surface);
}

.faq-list {
  display: grid;
  gap: 14px;
}

.faq-list details summary {
  cursor: pointer;
  font-weight: 800;
  list-style: none;
}

.faq-list details summary::-webkit-details-marker {
  display: none;
}

.faq-list details p {
  margin-top: 12px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: center;
  margin-top: 24px;
}

.site-footer strong {
  display: block;
  margin-bottom: 6px;
}

.footer-links {
  display: flex;
  gap: 18px;
  font-weight: 700;
}

@media (max-width: 980px) {
  .results-grid,
  .content-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: min(calc(100% - 12px), var(--max-width));
    padding-top: 6px;
  }

  .hero {
    padding: 10px 0 16px;
  }

  .calculator-card,
  .results-section,
  .content-section,
  .faq-section,
  .site-footer {
    padding: 16px;
    border-radius: 22px;
  }

  .form-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }

  .unit-toggle {
    margin: 14px 0 12px;
    padding: 4px;
  }

  .unit-btn {
    padding: 8px 12px;
    font-size: 0.9rem;
  }

  .field {
    gap: 5px;
  }

  .field span,
  .field-hint {
    font-size: 0.78rem;
  }

  .field input,
  .field select {
    min-height: 42px;
    padding: 10px 11px;
    border-radius: 10px;
    font-size: 0.92rem;
  }

  .split-fields {
    gap: 6px;
  }

  .primary-btn {
    margin-top: 12px;
    padding: 13px 16px;
    border-radius: 13px;
  }

  .form-error {
    min-height: 1.1rem;
    margin-top: 8px;
    font-size: 0.82rem;
  }

  .site-footer,
  .footer-links {
    flex-direction: column;
    align-items: flex-start;
  }

  h1 {
    font-size: clamp(1.9rem, 9vw, 2.6rem);
  }

  h2 {
    font-size: clamp(1.65rem, 8vw, 2.25rem);
  }
}

@media (max-width: 360px) {
  .calculator-card,
  .results-section,
  .content-section,
  .faq-section,
  .site-footer {
    padding: 14px;
  }

  .form-grid {
    gap: 8px;
  }

  .field input,
  .field select {
    padding: 9px;
    font-size: 0.86rem;
  }
}