:root {
  --color-primary: #e75480;
  --color-primary-dark: #c83e68;
  --color-secondary: #f8d7e5;
  --color-bg: #ffffff;
  --color-surface: #f8f9fa;
  --color-text: #222222;
  --color-muted: #5e6470;
  --color-border: #ecd5df;
  --color-success: #147a59;
  --shadow-soft: 0 20px 50px rgba(231, 84, 128, 0.08);
  --shadow-card: 0 10px 30px rgba(34, 34, 34, 0.06);
  --radius-sm: 14px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --max-width: 1200px;
  --header-height: 82px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--color-primary-dark);
  text-decoration: none;
}

a:hover,
a:focus-visible {
  text-decoration: underline;
}

img,
svg {
  max-width: 100%;
}

button,
input,
select {
  font: inherit;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  padding: 0.9rem 1.1rem;
  background: var(--color-primary);
  color: #fff;
  border-radius: 999px;
  z-index: 200;
}

.skip-link:focus {
  top: 16px;
}

.container {
  width: min(calc(100% - 2rem), var(--max-width));
  margin-inline: auto;
}

.section {
  padding: clamp(3.5rem, 6vw, 6rem) 0;
}

.section-alt {
  background: var(--color-surface);
}

.section-head {
  max-width: 760px;
  margin-bottom: 2rem;
}

.section-head.narrow {
  max-width: 680px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 0.8rem;
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-primary-dark);
}

.eyebrow::before {
  content: "";
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), #ff8eb0);
}

h1,
h2,
h3 {
  line-height: 1.15;
  margin: 0 0 1rem;
  letter-spacing: -0.03em;
}

h1 {
  font-size: clamp(2.4rem, 7vw, 4.4rem);
}

h2 {
  font-size: clamp(1.8rem, 4vw, 3rem);
}

h3 {
  font-size: clamp(1.2rem, 3vw, 1.45rem);
}

p {
  margin: 0 0 1rem;
  color: var(--color-text);
}

small,
.form-note,
.chart-note,
.fine-print {
  color: var(--color-muted);
}

.card,
.mini-card,
.result-card,
.info-card,
.tool-card,
.measure-card,
.article-side,
.article-intro {
  border: 1px solid var(--color-border);
  background: #fff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

.card {
  padding: 1.35rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.9rem 1.2rem;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  font-weight: 700;
  transition: transform 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
  text-decoration: none;
}

.button-primary {
  background: linear-gradient(135deg, var(--color-primary), #ff7fa6);
  color: #fff;
  box-shadow: var(--shadow-soft);
}

.button-secondary {
  background: #fff;
  color: var(--color-primary-dark);
  border-color: var(--color-border);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(236, 213, 223, 0.8);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--header-height);
}

.brand {
  display: inline-flex;
  align-items: center;
}

.menu-toggle {
  display: inline-flex;
  flex-direction: column;
  gap: 0.35rem;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  border: 1px solid var(--color-border);
  background: #fff;
  align-items: center;
  justify-content: center;
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 999px;
}

.site-nav {
  position: absolute;
  left: 1rem;
  right: 1rem;
  top: calc(100% - 0.25rem);
  display: none;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1rem;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  box-shadow: var(--shadow-soft);
}

.site-nav.is-open {
  display: flex;
}

.site-nav a {
  font-weight: 600;
}

.nav-cta {
  margin-top: 0.25rem;
}

.section-hero {
  padding-top: clamp(2rem, 5vw, 3.5rem);
  background:
    radial-gradient(circle at top right, rgba(231, 84, 128, 0.12), transparent 32%),
    radial-gradient(circle at left center, rgba(248, 215, 229, 0.5), transparent 35%),
    #fff;
}

.hero-grid {
  display: grid;
  gap: 1.5rem;
  align-items: start;
}

.hero-lead {
  font-size: 1.07rem;
  color: #3c4553;
  max-width: 65ch;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.4rem 0 1.6rem;
}

.hero-badges span {
  padding: 0.65rem 0.9rem;
  background: rgba(248, 215, 229, 0.55);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.92rem;
}

.card-grid,
.tool-grid,
.measure-grid,
.footer-grid,
.result-grid,
.form-grid,
.conversion-grid {
  display: grid;
  gap: 1rem;
}

.two-up,
.three-up {
  grid-template-columns: 1fr;
}

.mini-card {
  display: block;
  padding: 1rem 1.1rem;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.mini-card:hover,
.mini-card:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(231, 84, 128, 0.4);
  text-decoration: none;
}

.mini-card strong,
.mini-card span {
  display: block;
}

.mini-card span {
  margin-top: 0.35rem;
  color: var(--color-muted);
}

.calculator-panel {
  padding: 1.4rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
}

.calculator-head p:last-child {
  color: var(--color-muted);
}

.calculator-form {
  margin-top: 1.2rem;
}

.unit-toggle {
  margin: 0 0 1rem;
  padding: 0;
  border: 0;
}

.unit-toggle legend {
  font-weight: 700;
  margin-bottom: 0.65rem;
}

.unit-toggle {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.unit-toggle label {
  position: relative;
  display: inline-flex;
}

.unit-toggle input {
  position: absolute;
  opacity: 0;
}

.unit-toggle span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 92px;
  min-height: 46px;
  padding: 0.7rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: #fff;
  font-weight: 700;
}

.unit-toggle input:checked + span {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

label > span {
  display: block;
  font-weight: 700;
  margin-bottom: 0.45rem;
}

input[type="number"],
input[type="search"],
select {
  width: 100%;
  min-height: 52px;
  border-radius: 16px;
  border: 1px solid var(--color-border);
  background: #fff;
  padding: 0.85rem 1rem;
  color: var(--color-text);
}

input:focus-visible,
select:focus-visible,
button:focus-visible,
details summary:focus-visible,
a:focus-visible {
  outline: 3px solid rgba(231, 84, 128, 0.24);
  outline-offset: 2px;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

.result-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 1.25rem;
}

.result-card {
  padding: 1rem;
  min-height: 110px;
}

.result-card.highlight {
  background: linear-gradient(180deg, rgba(231, 84, 128, 0.08), rgba(248, 215, 229, 0.28));
}

.result-card.full-width {
  grid-column: 1 / -1;
}

.result-card .label {
  display: block;
  color: var(--color-muted);
  margin-bottom: 0.65rem;
  font-size: 0.92rem;
}

.result-card strong {
  font-size: 1.35rem;
  line-height: 1.2;
}

.tool-card,
.measure-card,
.info-card {
  height: 100%;
}

.compact-form {
  display: grid;
  gap: 0.85rem;
  margin-top: 1rem;
}

.tool-output {
  margin-top: 1rem;
  padding: 1rem;
  background: rgba(248, 215, 229, 0.28);
  border-radius: 16px;
}

.conversion-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 1rem;
}

.conversion-grid div {
  padding: 0.95rem;
  border-radius: 16px;
  background: rgba(248, 215, 229, 0.3);
  border: 1px solid var(--color-border);
  text-align: center;
}

.conversion-grid span {
  display: block;
  color: var(--color-muted);
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
}

.conversion-grid strong {
  font-size: 1.2rem;
}

.measure-grid .measure-card {
  padding: 1rem;
}

.measure-illustration {
  width: 100%;
  height: auto;
  margin-bottom: 1rem;
}

.chart-shell,
.conversion-table-card {
  padding: 1rem;
}

.chart-toolbar {
  display: grid;
  gap: 0.75rem;
  align-items: end;
  margin-bottom: 1rem;
}

.chart-search span {
  display: block;
  margin-bottom: 0.45rem;
}

.table-wrap {
  overflow-x: auto;
  border-radius: 18px;
  border: 1px solid var(--color-border);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 760px;
  background: #fff;
}

.data-table.compact {
  min-width: 420px;
}

.data-table th,
.data-table td {
  padding: 0.9rem 0.85rem;
  border-bottom: 1px solid rgba(236, 213, 223, 0.65);
  text-align: left;
  vertical-align: top;
}

.data-table thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: #fff5f8;
  font-size: 0.95rem;
}

.data-table tbody tr:hover {
  background: rgba(248, 215, 229, 0.18);
}

.article-shell {
  display: grid;
  gap: 1.25rem;
}

.article-side {
  align-self: start;
}

.article-side nav {
  display: grid;
  gap: 0.75rem;
}

.article-side a {
  font-weight: 600;
}

.article-content {
  display: grid;
  gap: 1rem;
}

.content-block,
.faq-block {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: clamp(1.25rem, 3vw, 2rem);
  box-shadow: var(--shadow-card);
}

.content-block p:last-child,
.article-intro p:last-child,
.info-card p:last-child,
.tool-card p:last-child,
.measure-card p:last-child {
  margin-bottom: 0;
}

.faq-list {
  display: grid;
  gap: 0.75rem;
}

.faq-list details {
  border: 1px solid var(--color-border);
  border-radius: 18px;
  background: #fff9fb;
  padding: 0.25rem 1rem 1rem;
}

.faq-list summary {
  cursor: pointer;
  list-style: none;
  padding: 1rem 0;
  font-weight: 700;
}

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

.faq-list summary::after {
  content: "+";
  float: right;
  color: var(--color-primary-dark);
  font-size: 1.25rem;
  line-height: 1;
}

.faq-list details[open] summary::after {
  content: "−";
}

.site-footer {
  padding: 3rem 0;
  background: #1f1f24;
  color: rgba(255, 255, 255, 0.92);
}

.site-footer p,
.site-footer a {
  color: rgba(255, 255, 255, 0.9);
}

.site-footer nav {
  display: grid;
  gap: 0.7rem;
}

@media (min-width: 760px) {
  .hero-grid,
  .tool-grid,
  .measure-grid,
  .footer-grid,
  .chart-toolbar,
  .article-shell {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tool-grid,
  .measure-grid,
  .footer-grid {
    gap: 1.2rem;
  }

  .two-up {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .three-up {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .article-shell {
    grid-template-columns: minmax(250px, 290px) minmax(0, 1fr);
  }

  .article-side {
    position: sticky;
    top: calc(var(--header-height) + 1rem);
  }
}

@media (min-width: 1040px) {
  .menu-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    display: flex !important;
    flex-direction: row;
    align-items: center;
    gap: 1.15rem;
    border: 0;
    padding: 0;
    background: transparent;
    box-shadow: none;
  }

  .nav-cta {
    margin-top: 0;
    margin-left: 0.35rem;
  }

  .hero-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(360px, 440px);
    gap: 2rem;
  }

  .tool-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .chart-toolbar {
    grid-template-columns: minmax(260px, 380px) 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}