:root {
  --bg: #fff7fb;
  --paper: #fffdf8;
  --paper-soft: #f5edff;
  --cream: #fff0b8;
  --ink: #243a36;
  --muted: #667a75;
  --line: #243a36;
  --green: #2f7d67;
  --green-soft: #d9f2df;
  --violet: #8f73ff;
  --violet-soft: #eadfff;
  --mint: #4edfa6;
  --sun: #ffd45f;
  --peach: #ff9f82;
  --sky: #79dfff;
  --shadow: 5px 6px 0 rgba(36, 58, 54, .12);
  --shadow-soft: 0 18px 45px rgba(64, 81, 75, .12);
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: var(--sans);
  overflow-x: hidden;
}
body:before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  opacity: .28;
  background: radial-gradient(var(--violet) .7px, transparent .9px);
  background-size: 24px 24px;
  mask-image: linear-gradient(to bottom, #000, transparent 80%);
}
a { color: inherit; }
.wrap { width: min(1180px, calc(100% - 32px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(36, 58, 54, .12);
  background: rgba(255, 253, 248, .9);
  backdrop-filter: blur(18px);
}
.header-inner { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 850; text-decoration: none; white-space: nowrap; }
.brand .mark { width: 42px; height: 42px; display: block; filter: drop-shadow(3px 3px 0 rgba(36, 58, 54, .16)); }
.brand small { display: block; margin-top: 3px; color: var(--muted); font-size: 10px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; }
.primary-nav { display: flex; align-items: center; justify-content: flex-end; gap: 4px; min-width: 0; flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; }
.primary-nav::-webkit-scrollbar { display: none; }
.primary-nav a { padding: 8px 9px; border-radius: 9px; color: var(--muted); font-size: 12px; font-weight: 750; text-decoration: none; }
.primary-nav a:hover, .primary-nav a:focus-visible { color: var(--ink); background: var(--green-soft); outline: none; }

.calculator-page { padding-bottom: 60px; }
.calculator-hero { padding: 64px 0 28px; }
.hero-copy { max-width: 760px; }
.eyebrow, .section-label { display: inline-flex; align-items: center; gap: 8px; color: var(--green); font-family: var(--mono); font-size: 11px; font-weight: 800; letter-spacing: .07em; text-transform: uppercase; }
.eyebrow:before, .section-label:before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--sun); border: 1px solid var(--line); }
.calculator-hero h1 { max-width: 820px; margin: 12px 0 14px; font-size: clamp(38px, 6vw, 72px); line-height: .98; letter-spacing: -.04em; }
.calculator-hero p { max-width: 720px; margin: 0; color: var(--muted); font-size: 18px; line-height: 1.65; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.hero-meta span { padding: 7px 10px; border: 1px solid rgba(36, 58, 54, .16); border-radius: 999px; background: var(--paper); color: var(--muted); font-size: 11px; font-weight: 750; }

.calculator-shell { scroll-margin-top: 95px; }
.calculator-panel { border: 2px solid var(--line); border-radius: 24px; background: var(--paper); box-shadow: var(--shadow-soft); overflow: hidden; }
.panel-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 24px; padding: 26px 30px; border-bottom: 1px solid rgba(36, 58, 54, .13); background: linear-gradient(100deg, var(--green-soft), var(--paper)); }
.panel-heading h2, .result-panel h2 { margin: 8px 0 8px; font-size: clamp(23px, 3vw, 34px); line-height: 1.05; letter-spacing: -.025em; }
.panel-heading p { max-width: 620px; margin: 0; color: var(--muted); line-height: 1.55; }
.privacy-chip { max-width: 250px; padding: 9px 11px; border: 1px solid rgba(47, 125, 103, .28); border-radius: 10px; background: rgba(255, 255, 255, .68); color: var(--green); font-size: 11px; line-height: 1.4; font-weight: 700; }
.calculator-grid { display: grid; grid-template-columns: minmax(0, 1.12fr) minmax(330px, .88fr); gap: 0; }
.calculator-form { padding: 28px 30px 30px; border-right: 1px solid rgba(36, 58, 54, .13); }
.form-row { display: grid; gap: 16px; margin-bottom: 18px; }
.two-col { grid-template-columns: repeat(2, minmax(0, 1fr)); align-items: start; }
.field { display: grid; gap: 7px; min-width: 0; color: var(--ink); font-size: 13px; font-weight: 750; }
.field > span, .field-set legend { font-weight: 800; }
.field small { color: var(--muted); font-size: 11px; font-weight: 500; line-height: 1.4; }
.field input, .field select { width: 100%; min-height: 44px; border: 1.5px solid rgba(36, 58, 54, .24); border-radius: 9px; padding: 0 12px; color: var(--ink); background: #fff; font: inherit; font-size: 15px; font-weight: 650; outline: none; }
.field input:focus, .field select:focus { border-color: var(--green); box-shadow: 0 0 0 3px rgba(47, 125, 103, .14); }
.input-with-prefix, .input-with-suffix { display: flex; align-items: center; min-height: 44px; border: 1.5px solid rgba(36, 58, 54, .24); border-radius: 9px; background: #fff; overflow: hidden; }
.input-with-prefix:focus-within, .input-with-suffix:focus-within { border-color: var(--green); box-shadow: 0 0 0 3px rgba(47, 125, 103, .14); }
.input-with-prefix b, .input-with-suffix b { padding: 0 12px; color: var(--green); font-size: 15px; }
.input-with-prefix input, .input-with-suffix input { min-height: 42px; border: 0; border-radius: 0; box-shadow: none; }
.input-with-suffix b { order: 2; color: var(--muted); }
.field-set { margin: 2px 0 20px; padding: 0; border: 0; }
.field-set legend { margin-bottom: 8px; color: var(--ink); font-size: 13px; }
.choice-grid { display: grid; gap: 8px; }
.choice-grid-three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.choice-grid label { min-width: 0; }
.choice-grid input { position: absolute; opacity: 0; pointer-events: none; }
.choice-grid span { display: grid; place-items: center; min-height: 42px; padding: 8px; border: 1.5px solid rgba(36, 58, 54, .18); border-radius: 9px; color: var(--muted); background: #fff; font-size: 12px; font-weight: 750; text-align: center; cursor: pointer; }
.choice-grid input:checked + span { border-color: var(--line); background: var(--cream); color: var(--ink); box-shadow: 2px 2px 0 rgba(36, 58, 54, .12); }
.choice-grid input:focus-visible + span { outline: 3px solid rgba(47, 125, 103, .24); }
.form-message { min-height: 18px; margin: -4px 0 11px; color: #a43b2e; font-size: 12px; font-weight: 700; }
.form-message:not(.is-visible) { visibility: hidden; }
.form-actions { display: flex; gap: 10px; align-items: center; }
.button { min-height: 44px; border: 1.5px solid var(--line); border-radius: 9px; padding: 0 15px; font: inherit; font-size: 13px; font-weight: 800; cursor: pointer; }
.button-primary { flex: 1; background: var(--green); color: #fff; box-shadow: 3px 3px 0 rgba(36, 58, 54, .14); }
.button-primary:hover { background: #256956; transform: translateY(-1px); }
.button-secondary { background: var(--paper); color: var(--ink); }
.button-secondary:hover { background: var(--violet-soft); }
.button:active { transform: translate(1px, 1px); box-shadow: none; }

.result-panel { min-width: 0; padding: 28px 26px; background: var(--paper-soft); }
.result-panel-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 14px; }
.result-status { padding: 5px 8px; border-radius: 999px; background: var(--mint); color: #164a39; font-size: 10px; font-weight: 850; text-transform: uppercase; white-space: nowrap; }
.result-empty { margin: 22px 0 8px; color: var(--muted); font-size: 14px; line-height: 1.65; }
.result-values[hidden], .result-empty[hidden] { display: none; }
.result-highlight { margin: 20px 0 14px; padding: 18px; border: 1.5px solid var(--line); border-radius: 14px; background: #fff; box-shadow: 3px 4px 0 rgba(36, 58, 54, .1); }
.result-highlight span, .result-list span { display: block; color: var(--muted); font-size: 11px; font-weight: 700; }
.result-highlight strong { display: block; margin-top: 4px; color: var(--green); font-size: clamp(26px, 4vw, 38px); letter-spacing: -.03em; }
.result-list { display: grid; gap: 0; border-top: 1px solid rgba(36, 58, 54, .15); }
.result-list div { display: flex; align-items: baseline; justify-content: space-between; gap: 15px; padding: 11px 0; border-bottom: 1px solid rgba(36, 58, 54, .12); }
.result-list strong { color: var(--ink); font-size: 14px; text-align: right; }
.result-note { margin: 17px 0 0; color: var(--muted); font-size: 11px; line-height: 1.5; }
.notice-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-top: 14px; }
.notice-row div { display: flex; gap: 9px; align-items: flex-start; padding: 12px 14px; border-left: 3px solid var(--sun); background: rgba(255, 253, 248, .72); color: var(--muted); font-size: 12px; line-height: 1.5; }
.notice-row strong { flex: 0 0 auto; color: var(--ink); }

.content-sections { display: grid; gap: 18px; margin-top: 34px; }
.content-panel { border: 1.5px solid rgba(36, 58, 54, .16); border-radius: 16px; padding: 26px; background: rgba(255, 253, 248, .86); box-shadow: 3px 4px 0 rgba(36, 58, 54, .06); }
.content-panel h2 { max-width: 760px; margin: 9px 0 15px; font-size: clamp(25px, 3.3vw, 38px); line-height: 1.08; letter-spacing: -.03em; }
.content-panel h3 { margin: 9px 0 6px; font-size: 16px; line-height: 1.2; }
.content-panel p, .content-panel li { color: var(--muted); font-size: 15px; line-height: 1.72; }
.content-panel p { margin: 0 0 12px; }
.content-panel ul { margin: 0; padding-left: 20px; }
.intro-panel, .formula-panel, .example-panel, .notes-panel { display: grid; grid-template-columns: minmax(190px, .55fr) minmax(0, 1fr); gap: 28px; align-items: start; }
.steps-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 10px; }
.step-item { min-width: 0; padding: 15px; border: 1px solid rgba(36, 58, 54, .14); border-radius: 12px; background: #fff; }
.step-item b { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 8px; background: var(--violet-soft); color: var(--ink); font-size: 12px; }
.step-item p { margin: 0; font-size: 12px; line-height: 1.55; }
.formula-content code { display: block; margin: 4px 0 15px; padding: 15px; border: 1px solid rgba(36, 58, 54, .18); border-radius: 10px; background: #243a36; color: var(--cream); font-family: var(--mono); font-size: 15px; font-weight: 700; overflow-x: auto; }
.example-box { display: grid; gap: 8px; margin-bottom: 10px; padding: 16px; border-left: 4px solid var(--green); background: var(--green-soft); color: var(--ink); font-size: 14px; line-height: 1.55; }
.related-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 10px; }
.related-card { display: flex; min-width: 0; flex-direction: column; gap: 7px; padding: 15px; border: 1px solid rgba(36, 58, 54, .16); border-radius: 12px; background: #fff; text-decoration: none; }
.related-card:hover { border-color: var(--green); transform: translateY(-2px); box-shadow: 3px 4px 0 rgba(36, 58, 54, .1); }
.related-card-label { color: var(--green); font-family: var(--mono); font-size: 10px; font-weight: 800; text-transform: uppercase; }
.related-card strong { font-size: 14px; line-height: 1.25; }
.related-card > span:last-child { color: var(--muted); font-size: 12px; line-height: 1.45; }
.faq-panel { scroll-margin-top: 95px; }
.faq-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.faq-grid details { border: 1px solid rgba(36, 58, 54, .16); border-radius: 10px; background: #fff; }
.faq-grid summary { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 15px 16px; color: var(--ink); font-size: 14px; font-weight: 800; cursor: pointer; list-style: none; }
.faq-grid summary::-webkit-details-marker { display: none; }
.faq-grid summary:after { content: "+"; color: var(--green); font-family: var(--mono); font-size: 18px; }
.faq-grid details[open] summary:after { content: "-"; }
.faq-grid details p { margin: 0; padding: 0 16px 16px; font-size: 13px; line-height: 1.6; }

.legal-page { padding: 58px 0 80px; }
.legal-hero { max-width: 760px; margin: 0 auto 25px; text-align: center; }
.legal-hero h1 { margin: 12px 0; font-size: clamp(35px, 6vw, 62px); line-height: 1; letter-spacing: -.04em; }
.legal-hero p { margin: 0; color: var(--muted); font-size: 17px; line-height: 1.65; }
.legal-panel { max-width: 900px; margin: 0 auto; }
.error-panel { text-align: center; }
.error-panel .button { display: inline-flex; width: auto; align-items: center; gap: 8px; text-decoration: none; }
.legal-panel h2 { margin-top: 28px; font-size: 25px; }
.legal-panel h2:first-of-type { margin-top: 0; }
.legal-date { display: inline-block; padding: 7px 10px; border-radius: 999px; background: var(--cream); color: var(--ink) !important; font-family: var(--mono); font-size: 11px !important; font-weight: 800; }
.legal-panel a { color: var(--green); font-weight: 750; }

.site-footer { margin-top: 24px; border-top: 1px solid rgba(36, 58, 54, .16); background: var(--paper); }
.footer-inner { display: flex; justify-content: space-between; gap: 35px; padding: 36px 0 28px; }
.footer-brand-block { max-width: 360px; }
.footer-logo { display: inline-flex; align-items: center; gap: 9px; color: var(--ink); font-size: 18px; font-weight: 850; text-decoration: none; }
.footer-logo img { filter: drop-shadow(2px 2px 0 rgba(36, 58, 54, .14)); }
.footer-brand-block p { margin: 12px 0 10px; color: var(--muted); font-size: 13px; line-height: 1.6; }
.footer-email { color: var(--green); font-family: var(--mono); font-size: 11px; font-weight: 700; text-decoration: none; }
.footer-links { display: grid; grid-template-columns: repeat(3, minmax(120px, 1fr)); gap: 25px; }
.footer-links div { display: flex; flex-direction: column; gap: 8px; }
.footer-links strong { color: var(--ink); font-size: 11px; text-transform: uppercase; }
.footer-links a { color: var(--muted); font-size: 12px; text-decoration: none; }
.footer-links a:hover { color: var(--green); }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; padding: 14px 0 24px; border-top: 1px solid rgba(36, 58, 54, .1); }
.footer-bottom p { margin: 0; color: var(--muted); font-size: 11px; line-height: 1.5; }

.language-menu { position: relative; margin-left: auto; font-size: 12px; }
.language-menu summary { cursor: pointer; list-style: none; color: var(--ink); font-weight: 800; }
.language-menu summary::-webkit-details-marker { display: none; }
.language-options { position: absolute; right: 0; z-index: 5; display: grid; min-width: 140px; margin-top: 8px; padding: 6px; border: 1px solid rgba(36, 58, 54, .18); border-radius: 9px; background: #fff; box-shadow: 3px 4px 0 rgba(36, 58, 54, .1); }
.language-options a { padding: 7px 8px; color: var(--ink); text-decoration: none; }
.language-options a:hover, .language-options a[aria-current="page"] { background: var(--cream); }

@media (max-width: 980px) {
  .header-inner { flex-wrap: wrap; }
  .primary-nav { flex: 1 1 400px; justify-content: flex-start; }
  .calculator-grid { grid-template-columns: 1fr; }
  .calculator-form { border-right: 0; border-bottom: 1px solid rgba(36, 58, 54, .13); }
  .steps-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .related-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 680px) {
  .wrap { width: min(100% - 20px, 560px); }
  .header-inner { min-height: 64px; display: block; padding-top: 10px; }
  .brand small { display: none; }
  .primary-nav { width: 100%; margin-top: 6px; padding-bottom: 8px; justify-content: flex-start; }
  .language-menu { margin: 8px 0 0; }
  .language-options { left: 0; right: auto; }
  .calculator-hero { padding: 38px 0 20px; }
  .calculator-hero h1 { font-size: 42px; }
  .calculator-hero p { font-size: 16px; }
  .panel-heading, .calculator-form, .result-panel, .content-panel { padding: 20px; }
  .panel-heading { display: block; }
  .privacy-chip { max-width: none; margin-top: 15px; }
  .two-col, .notice-row, .intro-panel, .formula-panel, .example-panel, .notes-panel { grid-template-columns: 1fr; }
  .choice-grid-three { grid-template-columns: 1fr; }
  .choice-grid span { min-height: 38px; }
  .steps-grid, .related-grid, .faq-grid { grid-template-columns: 1fr; }
  .form-actions { align-items: stretch; flex-direction: column; }
  .button { width: 100%; }
  .footer-inner, .footer-bottom { display: block; }
  .footer-links { margin-top: 25px; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
  .footer-bottom p + p { margin-top: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *:before, *:after { scroll-behavior: auto !important; transition: none !important; }
}