:root {
  --ink: #12233f;
  --ink-2: #1a3155;
  --navy: #12233f;
  --paper: #f4f0e7;
  --paper-2: #ebe4d6;
  --white: #fffdf8;
  --accent: #b93f22;
  --mint: #a9d8c6;
  --line: rgba(18, 35, 63, .17);
  --muted: #526078;
  --text-soft: #45546d;
  --surface-warm: #fff7f2;
  --answer-bg: #e3eee8;
  --display: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --radius: 8px;
  --shadow: 0 24px 70px rgba(18, 35, 63, .18);
}

* { box-sizing: border-box; }
html { color-scheme: light dark; scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: var(--display); line-height: 1.6; }
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; }
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 99; padding: .75rem 1rem; background: var(--accent); color: #fff; }
.skip-link:focus { top: 1rem; }

.site-header { max-width: 1240px; margin: 0 auto; padding: 19px 28px; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--line); position: relative; z-index: 20; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 15px; font-weight: 650; text-decoration: none; letter-spacing: -.65px; white-space: nowrap; }
.brand::before { content: ""; width: 34px; height: 34px; flex: 0 0 34px; background: url("/assets/favicon.svg") center / contain no-repeat; filter: drop-shadow(0 5px 10px rgba(18,35,63,.13)); transition: transform .2s ease; }
.brand:hover::before { transform: rotate(-5deg) scale(1.04); }
.brand strong { margin-left: 3px; color: var(--accent); font-weight: 850; }
.brand-mark { display: none; }
.footer-brand::before, footer .brand::before { width: 29px; height: 29px; flex-basis: 29px; }
.site-header nav { display: flex; gap: 32px; }
.site-header nav a { text-decoration: none; font-size: 13px; font-weight: 700; }
.site-header nav a:hover { color: var(--accent); }
.nav-toggle { display: none; min-height: 42px; padding: 0 14px; color: var(--ink); background: var(--white); border: 1px solid var(--ink); border-radius: 4px; font-size: 12px; font-weight: 800; cursor: pointer; }
.enhanced-nav { align-items: center; }
.enhanced-nav > a, .nav-menu > summary { min-height: 40px; display: inline-flex; align-items: center; }
.enhanced-nav > a[aria-current="page"] { color: var(--accent); }
.nav-menu { position: relative; }
.nav-menu > summary { gap: 7px; cursor: pointer; list-style: none; font-size: 13px; font-weight: 700; }
.nav-menu > summary::-webkit-details-marker { display: none; }
.nav-menu > summary::after { content: "↓"; color: var(--accent); font: 11px var(--mono); transition: transform .2s; }
.nav-menu[open] > summary::after { transform: rotate(180deg); }
.nav-dropdown { width: min(680px, calc(100vw - 36px)); padding: 18px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; position: absolute; top: calc(100% + 10px); right: 0; color: var(--ink); background: var(--white); border: 1px solid var(--ink); border-radius: 6px; box-shadow: var(--shadow); }
.nav-dropdown::before { content: ""; width: 12px; height: 12px; position: absolute; top: -7px; right: 28px; background: var(--white); border-top: 1px solid var(--ink); border-left: 1px solid var(--ink); transform: rotate(45deg); }
.nav-dropdown a { min-width: 0; padding: 14px; display: grid; gap: 3px; background: var(--paper); border: 1px solid transparent; border-radius: 4px; text-decoration: none; }
.nav-dropdown a:hover, .nav-dropdown a[aria-current="page"] { color: var(--ink); border-color: var(--accent); background: var(--surface-warm); }
.nav-dropdown strong { font-size: 13px; }
.nav-dropdown small { color: var(--muted); font-size: 10px; font-weight: 500; }

.hero { max-width: 1240px; min-height: 700px; margin: 0 auto; padding: 72px 28px 88px; display: grid; grid-template-columns: minmax(0, .9fr) minmax(480px, 1fr); gap: 7vw; align-items: center; position: relative; }
.hero::before { content: ""; position: absolute; width: 330px; height: 330px; left: -195px; top: 110px; border: 1px solid var(--line); border-radius: 50%; box-shadow: 0 0 0 50px rgba(18,35,63,.025), 0 0 0 100px rgba(18,35,63,.02); pointer-events: none; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 30px; font-size: clamp(4rem, 7.7vw, 7.5rem); line-height: .87; letter-spacing: -.075em; font-weight: 800; }
h1 em { color: var(--accent); font-style: normal; font-weight: 500; }
.hero-lede { max-width: 510px; margin-bottom: 32px; color: var(--text-soft); font-size: 17px; }
.trust-row { display: flex; flex-wrap: wrap; gap: 8px 22px; margin: 0; padding: 0; list-style: none; font-family: var(--mono); font-size: 10px; text-transform: uppercase; }
.trust-row li::before { content: "✓"; margin-right: 7px; color: var(--accent); font-weight: 700; }

.calculator-shell { padding: 30px; background: var(--navy); color: #fff; border-radius: var(--radius); box-shadow: var(--shadow); position: relative; overflow: hidden; }
.calculator-shell::before { content: ""; position: absolute; width: 180px; height: 180px; right: -100px; top: -100px; border: 32px solid rgba(169,216,198,.1); border-radius: 50%; }
.calculator-topline { display: flex; justify-content: space-between; align-items: center; margin-bottom: 25px; position: relative; }
.calculator-topline p, .calculator-topline h2 { margin: 0; color: #fff; font-family: var(--mono); font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; }
.text-button { padding: 0; color: #aeb9ca; background: none; border: 0; cursor: pointer; font-size: 12px; text-decoration: underline; }
.time-grid { display: grid; grid-template-columns: 1fr auto 1fr; gap: 14px; align-items: end; }
label > span:first-child, .break-field > span:first-child { display: block; margin-bottom: 7px; color: #c5cede; font-size: 12px; }
input { width: 100%; min-height: 54px; padding: 10px 13px; color: #fff; background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.2); border-radius: 5px; font-family: var(--mono); font-size: 19px; color-scheme: dark; outline: none; }
input:focus { border-color: var(--mint); box-shadow: 0 0 0 3px rgba(169,216,198,.15); }
.time-arrow { padding-bottom: 13px; color: var(--mint); }
.break-field { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin: 17px 0; padding: 13px 0; border-top: 1px solid rgba(255,255,255,.1); border-bottom: 1px solid rgba(255,255,255,.1); }
.break-field > span:first-child { margin: 0; }
.number-control { display: flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: 12px; }
.number-control input { width: 80px; min-height: 42px; font-size: 15px; }
.primary-button { width: 100%; min-height: 58px; display: flex; justify-content: space-between; align-items: center; padding: 0 20px; color: #fff; background: var(--accent); border: 0; border-radius: 5px; font-weight: 800; cursor: pointer; transition: transform .2s, background .2s; }
.primary-button:hover { background: #9f3219; transform: translateY(-2px); }
.form-error { margin: 10px 0 0; color: #ffc1b2; font-size: 12px; }
.result { margin-top: 18px; padding: 24px; background: var(--white); color: var(--ink); border-radius: 5px; }
.result-label { margin-bottom: 4px; color: var(--muted); font-size: 11px; text-transform: uppercase; letter-spacing: .08em; }
.result-main { display: flex; align-items: baseline; gap: 6px; padding-bottom: 19px; border-bottom: 1px solid var(--line); }
.result-main strong { font-family: var(--mono); font-size: clamp(2.5rem, 5vw, 4.2rem); font-weight: 500; line-height: 1; letter-spacing: -.07em; }
.result-main span { margin-right: 6px; color: var(--muted); font-size: 12px; }
.result-details { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; padding: 16px 0 4px; }
.result-details p { margin: 0; display: flex; flex-direction: column; }
.result-details span { color: var(--muted); font-size: 10px; text-transform: uppercase; }
.result-details strong { font-family: var(--mono); font-size: 14px; }
.copy-button { margin-top: 12px; padding: 8px 0 2px; color: var(--ink); background: none; border: 0; border-bottom: 1px solid var(--ink); font-size: 11px; font-weight: 800; cursor: pointer; }
.copy-button + .copy-button { margin-left: 18px; }
.privacy-note { margin: 14px 0 -7px; color: #98a8bf; font-size: 10px; text-align: center; }
.privacy-note span { color: var(--mint); font-size: 7px; }

.quick-tools, .explanation, .faq { max-width: 1184px; margin: 0 auto; padding: 105px 28px; }
.quick-tools { border-top: 1px solid var(--line); }
.section-heading { max-width: 660px; }
.section-heading h2 { margin-bottom: 50px; font-size: clamp(2.3rem, 5vw, 4.6rem); line-height: 1; letter-spacing: -.055em; }
.tool-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--ink); }
.tool-grid article { min-height: 260px; padding: 25px 24px; border-right: 1px solid var(--line); position: relative; transition: background .25s, transform .25s; }
.tool-grid article:first-child { border-left: 1px solid var(--line); }
.tool-grid article:hover { background: var(--white); transform: translateY(-5px); }
.tool-grid article > span:first-child { font-family: var(--mono); font-size: 11px; color: var(--accent); }
.tool-grid h3 { margin: 57px 0 10px; font-size: 23px; letter-spacing: -.03em; }
.tool-grid p { max-width: 260px; color: var(--muted); font-size: 13px; }
.soon { position: absolute; left: 24px; bottom: 24px; font-family: var(--mono); font-size: 9px; text-transform: uppercase; }

.explanation { display: grid; grid-template-columns: .85fr 1fr; gap: 9vw; }
.sticky-heading { align-self: start; position: sticky; top: 40px; }
.steps article { display: grid; grid-template-columns: 50px 1fr; gap: 20px; padding: 27px 0; border-top: 1px solid var(--line); }
.step-number { width: 33px; height: 33px; display: grid; place-items: center; color: #fff; background: var(--navy); border-radius: 50%; font-family: var(--mono); font-size: 11px; }
.steps h3 { margin-bottom: 7px; font-size: 17px; }
.steps p { margin-bottom: 0; color: var(--muted); font-size: 14px; }
.formula-card { margin-top: 18px; padding: 25px; color: #fff; background: var(--accent); transform: rotate(-1deg); }
.formula-card p { margin-bottom: 15px; color: #fff; font-size: 11px; text-transform: uppercase; }
.formula-card code { display: block; margin-bottom: 13px; color: #fff; font-family: var(--mono); font-size: 13px; }
.formula-card small { color: #fff; opacity: 1; font-size: 11px; }

.example-section { max-width: 1184px; margin: 40px auto; padding: 70px; display: grid; grid-template-columns: 1.2fr 1fr; gap: 35px 70px; align-items: center; color: #fff; background: var(--navy); border-radius: var(--radius); }
.example-section h2 { margin: 0; font-size: clamp(2rem, 4vw, 3.7rem); line-height: 1.05; letter-spacing: -.05em; }
.example-math { display: flex; gap: 15px; align-items: baseline; font-family: var(--mono); }
.example-math span { font-size: 24px; }
.example-math b { color: var(--mint); }
.example-math strong { color: #ff9a80; font-size: 44px; }
.example-section > p { grid-column: 2; margin: 0; color: #b7c1d0; font-size: 13px; }
.example-section > p strong { color: #fff; }

.faq { display: grid; grid-template-columns: .8fr 1.2fr; gap: 8vw; }
.faq-list { border-top: 1px solid var(--ink); }
details { border-bottom: 1px solid var(--line); }
summary { display: flex; justify-content: space-between; gap: 20px; padding: 23px 0; cursor: pointer; font-weight: 700; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary span { color: var(--accent); font-family: var(--mono); font-size: 22px; transition: transform .2s; }
details[open] summary span { transform: rotate(45deg); }
details p { max-width: 610px; padding: 0 35px 22px 0; color: var(--muted); font-size: 14px; }

footer { max-width: 1240px; margin: 0 auto; padding: 55px 28px 35px; display: grid; grid-template-columns: 1fr 1fr; gap: 23px; border-top: 1px solid var(--line); }
.footer-brand { font-size: 17px; }
footer > p { text-align: right; color: var(--muted); font-size: 12px; }
footer nav { display: flex; gap: 20px; }
footer nav a { font-size: 11px; }
footer small { text-align: right; color: var(--muted); font-size: 10px; }

/* Internal tools and editorial pages */
.page-shell { max-width: 1184px; margin: 0 auto; padding: 72px 28px 110px; }
.page-hero { max-width: 840px; margin-bottom: 42px; }
.breadcrumbs { margin-bottom: 22px; color: var(--muted); font-size: 12px; }
.breadcrumbs a { text-decoration-thickness: 1px; text-underline-offset: 3px; }
.page-hero h1 { font-size: clamp(3rem, 7vw, 6.5rem); }
.page-hero h1 em { display: block; }
.page-hero .hero-lede { max-width: 720px; }
.content-grid { display: grid; grid-template-columns: minmax(0, 1fr) 310px; gap: 54px; align-items: start; }
.article-content { min-width: 0; }
.article-content h2 { margin: 55px 0 17px; font-size: clamp(1.8rem, 4vw, 3rem); line-height: 1.08; letter-spacing: -.045em; }
.article-content h3 { margin: 32px 0 10px; font-size: 1.25rem; }
.article-content p, .article-content li { color: var(--text-soft); }
.article-content a { text-decoration-color: var(--accent); text-underline-offset: 3px; }
.editorial-visual { margin: 32px 0 42px; }
.editorial-visual picture { display: block; }
.editorial-visual img { width: 100%; height: auto; display: block; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 18px 46px rgba(18, 35, 63, .12); }
.editorial-visual figcaption { margin-top: 10px; padding-left: 14px; color: var(--muted); border-left: 2px solid var(--accent); font-size: 11px; line-height: 1.5; }
.visual-break { max-width: 1184px; margin: 0 auto; padding: 0 28px 20px; }
.article-content table { width: 100%; border-collapse: collapse; margin: 24px 0; font-size: 14px; }
.article-content th, .article-content td { padding: 12px; border: 1px solid var(--line); text-align: left; }
.article-content th { background: var(--paper-2); }
.side-card { padding: 24px; background: var(--white); border: 1px solid var(--line); position: sticky; top: 24px; }
.side-card h2 { margin: 0 0 14px; font-size: 18px; }
.side-card nav { display: grid; gap: 11px; }
.side-card a { font-size: 13px; text-underline-offset: 3px; }
.editorial-note { margin: 30px 0; padding: 20px 22px; border-left: 4px solid var(--accent); background: var(--white); }
.editorial-note strong { display: block; margin-bottom: 4px; }
.byline { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-top: 20px; color: var(--muted); font: 11px var(--mono); text-transform: uppercase; }
.tool-panel { margin: 34px 0 50px; padding: 30px; color: #fff; background: var(--navy); border-radius: var(--radius); box-shadow: var(--shadow); }
.tool-panel h2 { margin: 0 0 8px; color: #fff; font-size: 25px; }
.tool-panel > p { color: #c5cede; font-size: 13px; }
.tool-panel label > span:first-child { color: #c5cede; }
.tool-panel input, .tool-panel select { width: 100%; min-height: 50px; padding: 10px 12px; color: #fff; background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.2); border-radius: 5px; font-family: var(--mono); color-scheme: dark; }
.tool-panel input:focus, .tool-panel select:focus { outline: none; border-color: var(--mint); box-shadow: 0 0 0 3px rgba(169,216,198,.15); }
.field-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.field-grid.three { grid-template-columns: repeat(3, 1fr); }
.tool-result { margin-top: 20px; padding: 22px; color: var(--ink); background: var(--white); border-radius: 5px; }
.tool-result .big-result { margin: 0; font: 500 clamp(2rem, 5vw, 3.7rem)/1 var(--mono); letter-spacing: -.06em; }
.tool-result dl { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 20px 0 0; }
.tool-result dt { color: var(--muted); font-size: 10px; text-transform: uppercase; }
.tool-result dd { margin: 2px 0 0; font: 13px var(--mono); }
.tool-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.secondary-button, .link-button { min-height: 44px; padding: 0 15px; border-radius: 4px; cursor: pointer; font-weight: 700; }
.secondary-button { color: #fff; background: transparent; border: 1px solid rgba(255,255,255,.35); }
.link-button { color: var(--ink); background: var(--mint); border: 0; }
.duration-list { display: grid; gap: 10px; margin: 20px 0; }
.duration-row { display: grid; grid-template-columns: 50px 1fr 1fr auto; gap: 10px; align-items: end; }
.duration-row .row-index { align-self: center; font: 12px var(--mono); color: var(--mint); }
.icon-button { width: 44px; height: 50px; color: #fff; background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.2); border-radius: 5px; cursor: pointer; }
.calculation-history { margin-top: 24px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.18); }
.homepage-history { color: #fff; }
.history-heading { display: flex; justify-content: space-between; gap: 16px; align-items: center; }
.history-heading h3 { margin: 0; color: inherit; font-size: 15px; }
.history-clear { padding: 4px 0; color: var(--mint); background: transparent; border: 0; cursor: pointer; font-size: 11px; font-weight: 700; }
.history-clear:disabled { opacity: .45; cursor: default; }
.history-note, .history-empty { margin: 5px 0 0; color: #c5cede; font-size: 10px; }
.history-list { display: grid; gap: 8px; margin: 14px 0 0; padding: 0; list-style: none; }
.history-list li { display: grid; grid-template-columns: minmax(100px, 1fr) auto auto; gap: 8px 12px; align-items: center; padding: 10px 12px; background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.13); border-radius: 5px; }
.history-list strong { font: 12px var(--mono); }
.history-list small { grid-column: 1; color: #c5cede; font-size: 9px; }
.history-list button { color: var(--mint); background: transparent; border: 0; cursor: pointer; font-size: 10px; font-weight: 700; }
.week-wrap { overflow-x: auto; margin: 20px 0; }
.scroll-hint { display: none; }
.week-table { width: 100%; min-width: 780px; border-collapse: collapse; }
.week-table th { color: #c5cede; font-size: 11px; text-align: left; }
.week-table th, .week-table td { padding: 7px 5px; }
.week-table input { min-height: 43px; font-size: 13px; }
.week-table output { display: inline-block; min-width: 60px; font: 12px var(--mono); }
.hub-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.hub-card { min-height: 220px; padding: 25px; background: var(--white); border: 1px solid var(--line); text-decoration: none; transition: transform .2s, border-color .2s; }
.hub-card:hover { transform: translateY(-4px); border-color: var(--accent); }
.hub-card small { color: var(--accent); font: 10px var(--mono); text-transform: uppercase; }
.hub-card h2 { margin: 45px 0 10px; font-size: 23px; }
.hub-card p { color: var(--muted); font-size: 13px; }
.source-list { padding-left: 18px; }
.source-list li { margin-bottom: 11px; }
.full-nav-link { color: var(--accent); }
.tool-switcher { max-width: 1184px; margin: 18px auto 24px; padding: 11px 14px; display: flex; gap: 8px; align-items: center; overflow-x: auto; background: transparent; border: 1px solid var(--line); border-radius: var(--radius); scrollbar-width: thin; }
.tool-switcher strong { flex: 0 0 auto; margin-right: 8px; font: 10px var(--mono); letter-spacing: .06em; text-transform: uppercase; }
.tool-switcher a { flex: 0 0 auto; padding: 7px 10px; background: var(--white); border: 1px solid var(--line); border-radius: 4px; font-size: 11px; font-weight: 700; text-decoration: none; }
.tool-switcher a:hover, .tool-switcher a[aria-current="page"] { color: #fff; background: var(--navy); border-color: var(--navy); }
.toc { margin: 30px 0 38px; padding: 24px; background: var(--white); border: 1px solid var(--line); }
.toc h2 { margin: 0 0 12px; font-size: 18px; letter-spacing: -.02em; }
.toc ol { margin: 0; padding-left: 20px; columns: 2; column-gap: 35px; }
.toc li { break-inside: avoid; margin: 7px 0; font-size: 13px; }
.answer-box { margin: 28px 0; padding: 24px; background: var(--answer-bg); border: 1px solid var(--line); }
.answer-box p:last-child { margin-bottom: 0; }
.answer-label { margin-bottom: 7px; color: var(--accent); font: 700 10px var(--mono); letter-spacing: .07em; text-transform: uppercase; }
.example-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin: 24px 0; }
.example-card { padding: 20px; background: var(--white); border: 1px solid var(--line); }
.example-card h3 { margin-top: 0; font-size: 16px; }
.example-card code { display: block; padding: 10px; background: var(--paper-2); white-space: normal; }
.check-list { padding: 0; list-style: none; }
.check-list li { margin: 10px 0; padding-left: 27px; position: relative; }
.check-list li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 800; }
.related-cluster { margin-top: 55px; padding: 30px; color: #fff; background: var(--navy); }
.related-cluster h2 { margin-top: 0; color: #fff; }
.related-cluster p { color: #c5cede; }
.related-links { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.related-links a { padding: 14px; color: var(--ink); background: var(--white); text-decoration: none; font-weight: 700; }
.content-meta { margin: 25px 0; padding: 14px 0; display: flex; flex-wrap: wrap; gap: 10px 25px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.word-note { color: var(--muted); font-size: 12px; }

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #eef4f4;
    --ink-2: #dce8e5;
    --navy: #06101d;
    --paper: #07111d;
    --paper-2: #101d2b;
    --white: #111c29;
    --accent: #ef6845;
    --mint: #8ed6c5;
    --line: rgba(238, 244, 244, .17);
    --muted: #a9b7c8;
    --text-soft: #bdc8d6;
    --surface-warm: #241a17;
    --answer-bg: #102821;
    --shadow: 0 24px 70px rgba(0, 0, 0, .42);
  }

  body {
    background:
      radial-gradient(circle at 18% 0%, rgba(142, 214, 197, .12), transparent 31rem),
      radial-gradient(circle at 92% 14%, rgba(239, 104, 69, .10), transparent 28rem),
      var(--paper);
  }

  .brand::before,
  .editorial-visual img {
    filter: drop-shadow(0 10px 18px rgba(0, 0, 0, .28));
  }

  .calculator-shell,
  .tool-panel,
  .example-section,
  .related-cluster {
    border: 1px solid rgba(238, 244, 244, .10);
  }

  .result,
  .tool-result,
  .side-card,
  .hub-card,
  .toc,
  .example-card,
  .editorial-note,
  .nav-dropdown,
  .tool-switcher a {
    box-shadow: 0 18px 44px rgba(0, 0, 0, .18);
  }

  .nav-dropdown::before {
    background: var(--white);
  }
}

@media (prefers-reduced-motion: no-preference) {
  .hero-copy, .calculator-shell { animation: rise .35s both ease-out; }
  @keyframes rise { from { opacity: 0; transform: translateY(18px); } }
}

@media (max-width: 850px) {
  .site-header { flex-wrap: wrap; gap: 14px; }
  .nav-toggle { display: inline-flex; align-items: center; gap: 8px; }
  .site-header nav.enhanced-nav { width: 100%; display: grid; gap: 4px; padding: 10px; overflow: visible; background: var(--white); border: 1px solid var(--line); border-radius: 5px; }
  .site-header nav.enhanced-nav:not(.is-open) { display: none; }
  .enhanced-nav > a, .nav-menu > summary { min-height: 44px; padding: 0 12px; background: var(--paper); border: 1px solid transparent; border-radius: 4px; }
  .enhanced-nav > a[aria-current="page"] { border-color: var(--accent); }
  .nav-menu > summary { justify-content: space-between; }
  .nav-dropdown { width: 100%; margin-top: 4px; padding: 7px; grid-template-columns: 1fr; position: static; box-shadow: none; border-color: var(--line); }
  .nav-dropdown::before { display: none; }
  .nav-dropdown a { padding: 11px 12px; }
  .hero { min-height: auto; grid-template-columns: 1fr; gap: 45px; padding-top: 55px; }
  .hero-copy { text-align: center; }
  .trust-row { justify-content: center; }
  .hero-lede { margin-left: auto; margin-right: auto; }
  .calculator-shell { max-width: 590px; width: 100%; margin: 0 auto; }
  .tool-grid { grid-template-columns: 1fr; }
  .tool-grid article, .tool-grid article:first-child { min-height: 220px; border-left: 1px solid var(--line); border-bottom: 1px solid var(--line); }
  .explanation, .faq { grid-template-columns: 1fr; gap: 25px; }
  .sticky-heading { position: static; }
  .example-section { margin-left: 20px; margin-right: 20px; padding: 48px 35px; grid-template-columns: 1fr; }
  .example-section > p { grid-column: auto; }
  .content-grid { grid-template-columns: 1fr; }
  .side-card { position: static; }
  .field-grid.three { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .site-header { padding: 18px 18px; }
  .hero { gap: 32px; padding: 34px 18px 55px; }
  h1 { font-size: clamp(3.45rem, 18vw, 5rem); }
  .hero-lede { font-size: 15px; }
  .trust-row { gap: 6px 14px; font-size: 9px; }
  .calculator-shell { padding: 21px 17px; }
  .time-grid { gap: 8px; }
  input { min-height: 50px; padding: 8px; font-size: 16px; }
  .result { padding: 20px 17px; }
  .result-main strong { font-size: 2.6rem; }
  .quick-tools, .explanation, .faq { padding: 75px 18px; }
  .section-heading h2 { margin-bottom: 35px; font-size: 2.55rem; }
  .example-section { margin: 15px 10px; padding: 42px 24px; }
  .example-math strong { font-size: 35px; }
  footer { padding: 42px 18px 28px; grid-template-columns: 1fr; text-align: left; }
  footer > p, footer small { text-align: left; }
  footer nav { flex-wrap: wrap; }
  .page-shell { padding: 48px 18px 80px; }
  .page-hero h1 { font-size: 3.3rem; }
  .tool-panel { padding: 22px 17px; }
  .field-grid, .hub-grid { grid-template-columns: 1fr; }
  .duration-row { grid-template-columns: 35px 1fr 1fr auto; gap: 6px; }
  .duration-row input { padding: 5px; }
  .tool-result dl { grid-template-columns: 1fr; }
  .toc ol { columns: 1; }
  .example-grid, .related-links { grid-template-columns: 1fr; }
  .tool-switcher { margin: 12px 18px 18px; padding: 10px 34px 10px 10px; background: linear-gradient(90deg, transparent calc(100% - 42px), var(--paper)); }
  .scroll-hint { display: flex; align-items: center; gap: 6px; margin: -10px 0 12px; color: #c5cede; font-size: 11px; }
  .scroll-hint::after { content: "→"; color: var(--mint); font: 700 14px var(--mono); }
  .article-content table { display: block; max-width: 100%; overflow-x: auto; }
  .article-content { overflow-wrap: anywhere; }
  .history-list li { grid-template-columns: 1fr auto; }
  .history-list small { grid-column: 1 / -1; }
  .visual-break { padding: 0 18px 10px; }
  .editorial-visual { margin: 24px 0 34px; }
}

@media print {
  @page { size: A4 landscape; margin: 12mm; }
  body { color: #111; background: #fff; font-size: 10pt; }
  body * { visibility: hidden; }
  #ferramenta, #ferramenta * { visibility: visible; }
  #ferramenta { width: 100%; margin: 0; padding: 0; position: absolute; inset: 0 auto auto 0; color: #111; background: #fff; border: 0; box-shadow: none; }
  #ferramenta h2 { color: #111; font-size: 18pt; }
  #ferramenta > p, #ferramenta .scroll-hint, #ferramenta .tool-actions, #ferramenta .form-error { display: none !important; }
  #ferramenta .week-wrap { overflow: visible; margin: 8mm 0; }
  #ferramenta .week-table { min-width: 0; table-layout: fixed; }
  #ferramenta .week-table th, #ferramenta .week-table td { padding: 2mm 1.5mm; color: #111; border-bottom: 1px solid #bbb; }
  #ferramenta input { min-height: 0; padding: 1.5mm; color: #111; background: #fff; border: 1px solid #aaa; color-scheme: light; font-size: 9pt; }
  #ferramenta output { color: #111; }
  #ferramenta .tool-result { margin-top: 5mm; padding: 5mm; color: #111; background: #f4f4f4; border: 1px solid #bbb; box-shadow: none; }
  #ferramenta .tool-result .big-result { font-size: 24pt; }
  body:has(#hoursForm) #calculadora, body:has(#hoursForm) #calculadora * { visibility: visible; }
  body:has(#hoursForm) #calculadora { width: 100%; min-height: 0; margin: 0; padding: 0; display: block; position: absolute; inset: 0 auto auto 0; color: #111; background: #fff; }
  body:has(#hoursForm) #calculadora .hero-copy, body:has(#hoursForm) #calculadora .calculator-heading, body:has(#hoursForm) #calculadora form, body:has(#hoursForm) #calculadora .privacy-note, body:has(#hoursForm) #calculadora .calculation-history { display: none !important; }
  body:has(#hoursForm) #calculadora .calculator-shell { margin: 0; padding: 0; color: #111; background: #fff; box-shadow: none; }
  body:has(#hoursForm) #calculadora .result { color: #111; background: #fff; border: 1px solid #bbb; }
  body:has(#hoursForm) #calculadora .copy-button { display: none; }
}