:root {
  --navy: #0d1b2a;
  --text: #1b2733;
  --soft: #66737f;
  --paper: #fbfaf7;
  --white: #ffffff;
  --rule: #e4e1d9;
  --amber: #f0a202;
  --amber-dark: #c98500;
  --good: #1a7f4b;
  --thin: #b7791f;
  --bad: #c0392b;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
body {
  margin: 0;
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, sans-serif;
  color: var(--text);
  background: var(--paper);
}
a { color: var(--navy); text-decoration-color: var(--amber); text-underline-offset: 3px; }

.container { width: min(1120px, 100% - 32px); margin-inline: auto; }

.topbar { background: var(--navy); color: var(--white); }
.topbar .container { display: flex; justify-content: space-between; align-items: center; padding: 14px 0; }
.brand { color: var(--white); text-decoration: none; font-weight: 800; font-size: 19px; }
.brand b { color: var(--amber); }
.topbar nav a { color: #c9d3dc; text-decoration: none; margin-left: 18px; font-size: 15px; }
.topbar nav a:hover { color: var(--white); }

.intro { background: var(--navy); color: var(--white); padding: 28px 0 90px; }
.intro h1 { font-size: clamp(30px, 4.6vw, 46px); line-height: 1.12; margin: 0 0 10px; }
.intro p { color: #c9d3dc; font-size: 18px; max-width: 640px; margin: 0; }

.tool { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 0; margin-top: -64px;
  background: var(--white); border: 1px solid var(--rule); box-shadow: 0 10px 30px rgba(13, 27, 42, 0.08); }
.inputs { padding: 24px; border-right: 1px solid var(--rule); }
.outputs { padding: 24px; background: #fffdf6; }

fieldset { border: 0; padding: 0; margin: 0 0 18px; }
legend { font-weight: 800; font-size: 13px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--soft); margin-bottom: 10px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.f { display: flex; flex-direction: column; gap: 4px; margin-bottom: 12px; }
.f > span { font-size: 14px; font-weight: 600; }
.f small { color: var(--soft); font-size: 12.5px; line-height: 1.4; }
.f input, .f select {
  font: inherit; font-size: 17px; padding: 10px 12px; border: 1px solid #cfd6dc; border-radius: 6px; background: var(--white); color: var(--text); width: 100%;
}
.f input:focus, .f select:focus { outline: 2px solid var(--amber); outline-offset: 0; border-color: var(--amber); }
.money { position: relative; }
.money::before { content: "$"; position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: var(--soft); }
.money input { padding-left: 24px; }
.choice { display: flex; gap: 8px; margin-bottom: 12px; flex-wrap: wrap; }
.choice label { flex: 1 1 160px; border: 1px solid #cfd6dc; border-radius: 6px; padding: 10px 12px; cursor: pointer; font-size: 15px; display: flex; gap: 8px; align-items: center; }
.choice input { accent-color: var(--navy); }
.check { display: flex; gap: 8px; align-items: center; font-size: 15px; margin-bottom: 10px; cursor: pointer; }
.check input { accent-color: var(--navy); width: 18px; height: 18px; }
details.adv > summary { cursor: pointer; font-weight: 700; color: var(--navy); margin-bottom: 12px; }

.result { border-left: 6px solid var(--amber); background: var(--white); padding: 14px 16px; margin-bottom: 16px; }
.result[data-signal="good"] { border-color: var(--good); }
.result[data-signal="thin"] { border-color: var(--thin); }
.result[data-signal="pass"] { border-color: var(--bad); }
.result .lbl { font-size: 14px; color: var(--soft); }
.result .num { font-size: 40px; font-weight: 800; line-height: 1.1; color: var(--navy); }
.result .note { font-size: 14px; font-weight: 600; }

.breakdown { list-style: none; margin: 0 0 14px; padding: 0; font-size: 15px; }
.breakdown li { display: flex; justify-content: space-between; gap: 10px; padding: 7px 0; border-bottom: 1px dashed var(--rule); }
.breakdown em { color: var(--soft); font-style: normal; font-size: 13px; }
.breakdown li.sum { border-bottom: 2px solid var(--navy); font-weight: 700; }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.pair div { background: var(--white); border: 1px solid var(--rule); padding: 10px 12px; }
.pair span { display: block; font-size: 13px; color: var(--soft); }
.pair strong { font-size: 20px; color: var(--navy); }
.feesline { font-size: 14px; color: var(--soft); margin: 0 0 12px; }
.feesline strong { color: var(--text); }
.source { font-size: 12.5px; color: var(--soft); margin-top: 14px; }

.band { padding: 48px 0 0; }
.band h2 { font-size: clamp(23px, 3vw, 30px); margin: 0 0 16px; color: var(--navy); }
.tri { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.tri article { border-top: 4px solid var(--amber); background: var(--white); padding: 18px; }
.tri h3 { margin: 0 0 6px; font-size: 18px; }
.tri p { margin: 0; color: var(--soft); }
.tri .eg { margin-top: 10px; color: var(--text); font-size: 14px; }

.howto { counter-reset: n; list-style: none; padding: 0; margin: 0; }
.howto li { counter-increment: n; padding: 12px 0 12px 52px; position: relative; border-bottom: 1px solid var(--rule); }
.howto li::before { content: counter(n); position: absolute; left: 0; top: 10px; width: 36px; height: 36px; background: var(--navy); color: var(--amber); font-weight: 800; display: grid; place-items: center; }

.plus { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.plus div { background: var(--white); border: 1px solid var(--rule); padding: 14px; }
.plus b { display: block; color: var(--navy); }
.plus span { color: var(--soft); font-size: 14px; }

.qa details { border-bottom: 1px solid var(--rule); padding: 6px 0; }
.qa summary { cursor: pointer; font-weight: 700; padding: 8px 0; }
.qa p { margin: 0 0 12px; color: var(--soft); }

.ext { margin-top: 48px; background: var(--navy); color: var(--white); padding: 26px; display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; }
.ext h2 { margin: 0 0 4px; font-size: 22px; }
.ext p { margin: 0; color: #c9d3dc; }
.button { display: inline-block; background: var(--amber); color: var(--navy); font-weight: 800; text-decoration: none; padding: 12px 22px; border-radius: 6px; }
.button:hover { background: var(--amber-dark); }
.tag { display: inline-block; font-size: 12px; background: rgba(240,162,2,.18); color: var(--amber); padding: 2px 8px; border-radius: 99px; margin-left: 6px; vertical-align: middle; }

.doc { width: min(760px, 100% - 32px); margin: 32px auto 0; background: var(--white); border: 1px solid var(--rule); padding: 28px; }
.doc h1 { margin: 0 0 4px; color: var(--navy); }
.doc .date { color: var(--soft); font-size: 14px; margin: 0 0 18px; }
.doc h2 { font-size: 19px; margin: 24px 0 6px; color: var(--navy); }

.bottom { margin-top: 56px; border-top: 1px solid var(--rule); padding: 24px 0 32px; font-size: 14px; color: var(--soft); }
.bottom nav a { color: var(--soft); margin-right: 16px; }
.bottom p { margin: 10px 0 0; max-width: 800px; }

@media (max-width: 900px) {
  .tool { grid-template-columns: 1fr; }
  .inputs { border-right: 0; border-bottom: 1px solid var(--rule); }
  .tri, .plus { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .grid2, .pair, .tri, .plus { grid-template-columns: 1fr; }
  .grid3 { grid-template-columns: repeat(3, 1fr); }
  .topbar nav { display: none; }
  .result .num { font-size: 34px; }
}