:root {
  --ink: #102a43;
  --text: #243b53;
  --muted: #627d98;
  --line: #d9e2ec;
  --paper: #ffffff;
  --accent: #0f766e;
  --accent-dark: #0b5c56;
  --shadow: 0 18px 45px rgb(16 42 67 / 10%);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: #f8fbff;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; line-height: 1.6; }
a { color: #0b5c56; text-underline-offset: 0.16em; }
a:hover { color: #063f3b; }
.site-header, main, footer { width: min(1160px, calc(100% - 2rem)); margin-inline: auto; }
.site-header { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.brand { align-items: center; color: var(--ink); display: inline-flex; font-size: 1.05rem; font-weight: 650; gap: .55rem; line-height: 1.1; text-decoration: none; }
.brand b { color: var(--accent); font-weight: 750; }
.brand-mark { align-items: center; background: var(--ink); border-radius: 12px; color: white; display: inline-flex; font-size: 1.3rem; height: 34px; justify-content: center; width: 34px; }
nav { display: flex; flex-wrap: wrap; gap: .3rem 1.1rem; justify-content: flex-end; }
nav a { color: var(--text); font-size: .92rem; font-weight: 630; text-decoration: none; }
nav a:hover { color: var(--accent); }
.hero { display: grid; gap: 2.5rem; grid-template-columns: minmax(0, .9fr) minmax(460px, 1.1fr); padding: 4.6rem 0 3.5rem; }
.hero > div:first-child { align-self: center; padding-right: 1rem; }
.eyebrow { color: var(--accent); display: block; font-size: .78rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
h1, h2, h3 { color: var(--ink); letter-spacing: -.025em; line-height: 1.15; }
h1 { font-size: clamp(2.5rem, 5vw, 4.4rem); margin: .4rem 0 1rem; max-width: 14ch; }
h2 { font-size: clamp(1.5rem, 3vw, 2.15rem); margin: 0 0 1rem; }
h3 { font-size: 1.1rem; }
.lede { font-size: 1.18rem; margin: 0; max-width: 56ch; }
.hero-kicker { color: var(--muted); font-size: .95rem; font-weight: 600; margin-top: 1.2rem; }
.calculator { background: var(--paper); border: 1px solid var(--line); border-radius: 24px; box-shadow: var(--shadow); display: grid; grid-template-columns: minmax(220px, .85fr) minmax(260px, 1.15fr); overflow: hidden; }
.calculator form { background: #f5f9fc; display: grid; gap: .9rem; padding: 1.7rem; }
.form-heading h2 { font-size: 1.32rem; margin: .15rem 0 .2rem; }
.form-heading p { color: var(--muted); font-size: .88rem; margin: 0; }
label { color: var(--ink); display: grid; font-size: .88rem; font-weight: 750; gap: .35rem; }
input, select { appearance: none; background: white; border: 1px solid #bcccdc; border-radius: 9px; color: var(--ink); font: inherit; min-height: 44px; padding: .65rem .75rem; width: 100%; }
input:focus, select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgb(15 118 110 / 15%); outline: none; }
.advanced { display: grid; gap: .8rem; grid-template-columns: 1fr 1fr; }
.field-help { color: var(--muted); font-size: .76rem; margin: -.45rem 0 0; }
button { background: var(--accent); border: 0; border-radius: 9px; color: white; cursor: pointer; font: inherit; font-weight: 760; min-height: 46px; padding: .65rem 1rem; }
button:hover { background: var(--accent-dark); }
.result { display: flex; flex-direction: column; justify-content: center; padding: 1.8rem; }
.result-label { color: var(--muted); font-size: .84rem; font-weight: 750; margin: 0 0 .1rem; text-transform: uppercase; letter-spacing: .06em; }
.result-hero { align-items: baseline; display: flex; gap: .55rem; }
.result-hero strong { color: var(--ink); font-size: clamp(2.3rem, 5vw, 3.45rem); letter-spacing: -.06em; line-height: 1; }
.result-hero span { color: var(--muted); font-size: .92rem; }
.result-grid { display: grid; gap: .65rem; grid-template-columns: repeat(3, 1fr); margin: 1.35rem 0; }
.result-grid div { border-top: 1px solid var(--line); padding-top: .55rem; }
.result-grid span { color: var(--muted); display: block; font-size: .73rem; font-weight: 700; }
.result-grid b { color: var(--ink); font-size: .95rem; }
.breakdown { border-top: 1px solid var(--line); padding-top: .8rem; }
.breakdown summary { color: var(--accent); cursor: pointer; font-size: .9rem; font-weight: 750; }
dl { margin: .55rem 0 0; }
dl div { display: flex; font-size: .84rem; justify-content: space-between; padding: .18rem 0; }
dd { color: var(--ink); font-weight: 750; margin: 0; }
.result-note { color: var(--muted); font-size: .82rem; margin: 0; }
.content-grid { display: grid; gap: 1rem; grid-template-columns: repeat(3, 1fr); margin: 1.5rem 0 4rem; }
.feature-card { background: white; border: 1px solid var(--line); border-radius: 18px; padding: 1.4rem; }
.feature-card h2 { font-size: 1.2rem; }
.feature-card p { color: var(--muted); font-size: .94rem; margin-bottom: 0; }
.reading-section, .source-strip { margin: 0 auto; max-width: 800px; padding: 1.5rem 0; }
.reading-section p, .reading-section li { max-width: 74ch; }
.reading-section ul { padding-left: 1.2rem; }
.tool-links { display: grid; gap: .8rem; grid-template-columns: repeat(2, 1fr); }
.tool-links a { background: white; border: 1px solid var(--line); border-radius: 12px; display: grid; padding: 1rem; text-decoration: none; }
.tool-links strong { color: var(--ink); }
.tool-links span { color: var(--muted); font-size: .86rem; margin-top: .2rem; }
.faq details { border-bottom: 1px solid var(--line); padding: .8rem 0; }
.faq summary { color: var(--ink); cursor: pointer; font-weight: 720; }
.faq p { color: var(--text); margin-bottom: 0; }
.source-strip { background: #e8f6f3; border-radius: 16px; margin: 3rem auto 5rem; padding: 1.4rem; }
.source-strip h2 { font-size: 1.15rem; }
.source-strip p { font-size: .9rem; margin-bottom: 0; }
.article { margin: 4rem auto 5rem; max-width: 780px; }
.article h1 { max-width: 16ch; }
.article h2 { margin-top: 2.4rem; }
.article li { margin: .5rem 0; }
.source-list li { margin: 1rem 0; }
footer { border-top: 1px solid var(--line); display: grid; gap: 2rem; grid-template-columns: 1.4fr 1fr 1fr; padding: 2.2rem 0 3rem; }
footer h2 { font-size: .9rem; letter-spacing: 0; margin: 0 0 .6rem; }
footer p, footer a { color: var(--muted); display: block; font-size: .84rem; margin: .25rem 0; }
footer .brand { color: var(--ink); }
@media (max-width: 850px) { .site-header { align-items: flex-start; flex-direction: column; padding: 1rem 0; } nav { justify-content: flex-start; } .hero { grid-template-columns: 1fr; padding-top: 2.8rem; } .hero > div:first-child { padding-right: 0; } h1 { max-width: 18ch; } .calculator { grid-template-columns: 1fr; } .content-grid { grid-template-columns: 1fr; } footer { grid-template-columns: 1fr; } }
@media (max-width: 520px) { .site-header, main, footer { width: min(100% - 1.25rem, 1160px); } nav { gap: .5rem .8rem; } nav a { font-size: .82rem; } .hero { gap: 1.5rem; } .calculator form, .result { padding: 1.15rem; } .advanced, .tool-links { grid-template-columns: 1fr; } .result-grid { gap: .45rem; } .result-grid b { font-size: .82rem; } }