:root {
  color-scheme: dark;
  --bg: #050a0d;
  --panel: #0a1216;
  --panel-2: #0d181d;
  --line: #23343c;
  --line-bright: #376471;
  --text: #f3f8f8;
  --muted: #9dafb4;
  --accent: #47e6c1;
  --accent-2: #66a9ff;
  --error: #ff8278;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; background: radial-gradient(circle at 82% 5%, rgba(71, 230, 193, .10), transparent 30rem), radial-gradient(circle at 8% 28%, rgba(102, 169, 255, .07), transparent 25rem), var(--bg); }
button, input { font: inherit; }
a { color: inherit; }

.site-header, main, footer { width: min(1220px, calc(100% - 40px)); margin-inline: auto; }
.site-header { min-height: 86px; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-mark { width: 42px; height: 42px; display: grid; place-items: center; border: 1px solid var(--accent); border-radius: 11px; color: var(--accent); font-weight: 900; box-shadow: inset 0 0 22px rgba(71,230,193,.08); }
.brand > span:last-child { display: grid; }
.brand strong { letter-spacing: .08em; }
.brand small { margin-top: 2px; color: var(--muted); font-size: .66rem; letter-spacing: .13em; }
nav { display: flex; align-items: center; gap: 26px; color: var(--muted); font-size: .9rem; }
nav a { text-decoration: none; }
nav a:hover, nav a:focus-visible { color: var(--text); }
.back-link { padding: 10px 14px; border: 1px solid var(--line); border-radius: 9px; }

.workspace { padding: clamp(54px, 7vw, 92px) 0 56px; }
.workspace-intro { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(260px, .65fr); gap: 48px; align-items: end; }
.eyebrow, .section-kicker { margin: 0; color: var(--accent); font-size: .75rem; font-weight: 800; letter-spacing: .15em; }
.pulse { display: inline-block; width: 7px; height: 7px; margin-right: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 5px rgba(71,230,193,.10); }
h1 { max-width: 770px; margin: 15px 0 0; font-size: clamp(2.45rem, 5.5vw, 5.1rem); line-height: .98; letter-spacing: -.052em; }
.intro-copy { margin: 0 0 7px; color: var(--muted); line-height: 1.7; font-size: 1rem; }

.query-panel { display: grid; grid-template-columns: minmax(280px, 1.5fr) minmax(250px, .8fr) auto; gap: 18px; align-items: end; margin-top: 46px; padding: 22px; border: 1px solid var(--line-bright); border-radius: 16px; background: linear-gradient(135deg, rgba(13,24,29,.97), rgba(7,15,18,.96)); box-shadow: 0 22px 70px rgba(0,0,0,.24); }
.input-group { min-width: 0; }
.input-group label { display: block; margin-bottom: 9px; color: #c7d3d6; font-size: .82rem; font-weight: 750; }
.input-group input { width: 100%; min-height: 52px; padding: 0 15px; border: 1px solid #314751; border-radius: 10px; outline: none; background: #061015; color: var(--text); font-size: 1rem; }
.input-group input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(71,230,193,.12); }
.field-help, .field-error { margin: 8px 0 0; min-height: 18px; color: #84989e; font-size: .76rem; }
.field-error { color: var(--error); }
.prefix-input { display: grid; grid-template-columns: 38px 1fr; align-items: center; min-height: 52px; border: 1px solid #314751; border-radius: 10px; background: #061015; }
.prefix-input:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(71,230,193,.12); }
.prefix-input span { text-align: right; color: var(--accent); font-size: 1.2rem; font-weight: 800; }
.prefix-input input { border: 0; box-shadow: none; }
.prefix-input input:focus { box-shadow: none; }
.presets { display: flex; gap: 5px; margin-top: 8px; }
.presets button { flex: 1; padding: 5px 4px; border: 1px solid var(--line); border-radius: 6px; background: transparent; color: var(--muted); cursor: pointer; font-size: .72rem; }
.presets button:hover, .presets button:focus-visible { color: var(--accent); border-color: var(--accent); outline: none; }
.calculate-button { min-height: 52px; padding: 0 22px; display: flex; align-items: center; justify-content: center; gap: 24px; border: 0; border-radius: 10px; background: var(--accent); color: #03100d; font-weight: 850; cursor: pointer; }
.calculate-button:hover { background: #69f1d1; }

.results { margin-top: 22px; padding: clamp(22px, 3vw, 36px); border: 1px solid var(--line); border-radius: 18px; background: rgba(8,17,21,.86); }
.results-heading { display: flex; justify-content: space-between; gap: 20px; align-items: start; }
.results h2 { margin: 8px 0 0; font-size: clamp(1.8rem, 3vw, 2.65rem); letter-spacing: -.03em; }
.scope-badge { padding: 8px 11px; border: 1px solid rgba(71,230,193,.38); border-radius: 999px; background: rgba(71,230,193,.08); color: var(--accent); font-size: .76rem; font-weight: 800; white-space: nowrap; }
.metric-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 27px; }
.metric-grid article { padding: 18px; border: 1px solid var(--line); border-radius: 11px; background: var(--panel-2); }
.metric-grid span { display: block; color: var(--muted); font-size: .78rem; }
.metric-grid strong { display: block; margin-top: 7px; font-size: 1.45rem; }
.bit-panel { margin: 24px 0; padding: 17px; border: 1px solid var(--line); border-radius: 11px; }
.bit-labels { display: flex; justify-content: space-between; margin-bottom: 10px; color: var(--muted); font-size: .76rem; }
.bit-bar { display: grid; grid-template-columns: repeat(32, 1fr); gap: 3px; }
.bit { height: 24px; border-radius: 3px; background: rgba(102,169,255,.20); }
.bit.network { background: linear-gradient(180deg, var(--accent), #218e7b); }
.result-table { border-top: 1px solid var(--line); }
.result-row { min-height: 59px; display: grid; grid-template-columns: minmax(150px, .8fr) minmax(190px, 1fr) auto; align-items: center; gap: 16px; border-bottom: 1px solid var(--line); }
.result-row > span { color: var(--muted); }
.result-row code { color: var(--text); font-family: "Cascadia Code", "SFMono-Regular", Consolas, monospace; font-size: .98rem; }
.result-row button { padding: 6px 9px; border: 1px solid var(--line); border-radius: 6px; background: transparent; color: #9db0b5; cursor: pointer; font-size: .72rem; }
.result-row button:hover, .result-row button:focus-visible { color: var(--accent); border-color: var(--accent); outline: none; }
.special-note { margin: 18px 0 0; padding: 13px 15px; border-left: 3px solid var(--accent-2); background: rgba(102,169,255,.07); color: #b9c9ce; line-height: 1.55; }

.guide-section { padding: 70px 0; border-top: 1px solid var(--line); }
.guide-section h2 { max-width: 720px; margin: 11px 0 31px; font-size: clamp(2rem, 4vw, 3.4rem); letter-spacing: -.04em; }
.guide-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.guide-grid article { padding: 22px; border: 1px solid var(--line); border-radius: 12px; background: rgba(10,18,22,.72); }
.guide-grid article > span { color: var(--accent); font: 700 .72rem "Cascadia Code", monospace; }
.guide-grid h3 { margin: 26px 0 10px; font-size: 1rem; }
.guide-grid p { margin: 0; color: var(--muted); font-size: .9rem; line-height: 1.6; }
.privacy-strip { margin-bottom: 62px; padding: 24px; display: grid; grid-template-columns: 1fr .7fr; gap: 38px; border: 1px solid #29464e; border-radius: 13px; background: linear-gradient(110deg, rgba(71,230,193,.07), rgba(102,169,255,.04)); }
.privacy-strip > div { display: flex; gap: 14px; }
.privacy-icon { width: 37px; height: 37px; flex: 0 0 auto; display: grid; place-items: center; border: 1px solid var(--accent); border-radius: 50%; color: var(--accent); }
.privacy-strip strong { font-size: .93rem; }
.privacy-strip p { margin: 5px 0 0; color: var(--muted); font-size: .85rem; line-height: 1.55; }
footer { min-height: 82px; display: flex; justify-content: space-between; align-items: center; gap: 20px; border-top: 1px solid var(--line); color: #71858a; font-size: .8rem; }

@media (max-width: 900px) {
  .query-panel { grid-template-columns: 1fr 1fr; }
  .calculate-button { grid-column: 1 / -1; }
  .guide-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 680px) {
  .site-header { min-height: 74px; }
  nav > a:not(.back-link) { display: none; }
  .workspace-intro, .query-panel, .privacy-strip { grid-template-columns: 1fr; }
  .workspace-intro { gap: 20px; }
  .query-panel { margin-top: 30px; }
  .metric-grid { grid-template-columns: 1fr; }
  .results-heading { display: grid; }
  .scope-badge { width: fit-content; }
  .result-row { grid-template-columns: 1fr auto; padding: 13px 0; gap: 6px 12px; }
  .result-row > span { grid-column: 1 / -1; }
  .guide-grid { grid-template-columns: 1fr; }
  .bit-bar { gap: 2px; }
  .bit { height: 20px; }
  footer { align-items: flex-start; flex-direction: column; justify-content: center; }
}

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