:root {
  --bg: #0f1621;
  --surface: #17222f;
  --surface-2: #1f2c3d;
  --line: #2b3a4e;
  --ink: #eef3f8;
  --ink-dim: #a9b8c9;
  --ink-faint: #8596a9;
  --accent: #38c6e0;
  --on-brand: #0b1520;
  --error: #ff9d8a;
  --z1: #c4c8cc;
  --z2: #2f8fe8;
  --z3: #3fb24a;
  --z4: #f57c1f;
  --z5: #ea4335;
  --display: "Archivo", "Arial Narrow", Arial, sans-serif;
  --body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1, h2 { font-family: var(--display); font-weight: 800; line-height: 1.1; letter-spacing: -0.01em; margin: 0; }
h2 { font-size: 20px; }
p { margin: 0 0 12px; }
a { color: var(--accent); }

.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 16px; }
.icon { width: 1em; height: 1em; flex: none; display: block; }

/* Top bar */
.topbar { border-bottom: 1px solid var(--line); background: var(--surface); }
.topbar .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 24px; padding-top: 10px; padding-bottom: 10px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-family: var(--display); font-weight: 800; font-size: 18px; }
.brand img { width: 32px; height: 32px; }
.brand em { font-style: normal; color: var(--accent); }
nav { display: flex; flex-wrap: wrap; gap: 2px; margin: 0 -8px; }
nav a { display: flex; align-items: center; gap: 6px; padding: 6px 8px; border-radius: 7px; color: var(--ink-dim); text-decoration: none; font-size: 14px; font-weight: 500; }
nav a .icon { font-size: 17px; color: var(--brand); }
nav a:hover { color: var(--ink); background: var(--surface-2); }
nav a[aria-current] { color: var(--ink); background: var(--surface-2); }

.banner { margin: 0; padding: 7px 16px; text-align: center; font-size: 14px; font-weight: 600; color: var(--on-brand); background: var(--accent); }

/* Home */
.hero { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 2fr); gap: 32px; align-items: end; padding: 48px 0 32px; }
.eyebrow { font-family: var(--display); font-weight: 700; font-size: 13px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent); }
.hero h1 { font-size: clamp(42px, 8vw, 76px); font-stretch: 75%; line-height: 0.98; text-transform: uppercase; letter-spacing: 0; }
.hero h1 span { color: var(--accent); }
.lead { color: var(--ink-dim); font-size: 18px; margin: 18px 0 0; max-width: 34em; }
.zone-art { display: flex; align-items: flex-end; gap: 8px; height: 190px; }
.zone-art span { flex: 1; display: flex; align-items: flex-start; justify-content: center; padding-top: 7px; border-radius: 8px 8px 3px 3px; }
.zone-art b { font-family: var(--display); font-size: 13px; color: var(--on-brand); }
.zone-art .z1 { background: var(--z1); }
.zone-art .z2 { background: var(--z2); }
.zone-art .z3 { background: var(--z3); }
.zone-art .z4 { background: var(--z4); }
.zone-art .z5 { background: var(--z5); }
@media (max-width: 760px) {
  .hero { grid-template-columns: minmax(0, 1fr); padding-top: 32px; gap: 24px; }
  .zone-art { height: 90px; }
  .zone-art b { display: none; }
}

/* Boxes: icon or logo, a line, the blurb */
.cards { list-style: none; padding: 0; margin: 8px 0 24px; display: grid; gap: 16px; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.cards li { display: flex; }
.pair-cards { grid-template-columns: repeat(2, minmax(0, 1fr)); margin-top: 24px; }
@media (max-width: 900px) { .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 600px) { .cards, .pair-cards { grid-template-columns: minmax(0, 1fr); } }

.card {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  width: 100%;
  padding: 28px 24px 22px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  color: var(--ink);
  text-decoration: none;
  transition: border-color 0.14s ease, transform 0.14s ease;
}
.card::before { content: ""; position: absolute; inset: 0 0 auto; height: 4px; background: var(--brand); }
.card:hover { border-color: var(--brand); transform: translateY(-2px); }
.card-head { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.mark { width: 44px; height: 44px; object-fit: contain; flex: none; }
.rule { display: block; height: 1px; background: var(--line); margin-bottom: 16px; }
.blurb { color: var(--ink-dim); font-size: 15px; margin-bottom: 18px; }
.go { display: flex; align-items: center; gap: 6px; margin-top: auto; font-weight: 600; font-size: 14px; color: var(--brand); }
.go .icon { font-size: 16px; transition: transform 0.14s ease; }
.card:hover .go .icon { transform: translateX(3px); }
@media (prefers-reduced-motion: reduce) { .card, .go .icon { transition: none; } .card:hover { transform: none; } }

.tile {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 44px;
  height: 44px;
  font-size: 26px;
  border-radius: 12px;
  color: var(--brand);
  background: color-mix(in srgb, var(--brand) 15%, transparent);
}

/* A calculator */
.tool-head { display: flex; align-items: center; gap: 16px; padding: 32px 0 24px; }
.tool-head .tile { width: 60px; height: 60px; font-size: 36px; border-radius: 16px; }
.tool-head h1 { font-size: clamp(28px, 5vw, 42px); font-stretch: 85%; }
.tool-head p { margin: 4px 0 0; color: var(--ink-dim); }

.tool { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 20px; align-items: start; }
@media (max-width: 760px) { .tool { grid-template-columns: minmax(0, 1fr); } }

form, .result { position: relative; overflow: hidden; background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 24px; }
.result::before { content: ""; position: absolute; inset: 0 0 auto; height: 4px; background: var(--brand); }
@media (min-width: 761px) { .result { position: sticky; top: 16px; } }

fieldset { border: 0; padding: 0; margin: 0 0 16px; min-width: 0; }
legend, label { font-size: 14px; font-weight: 600; }
legend { padding: 0; margin-bottom: 6px; }

.options { display: flex; flex-wrap: wrap; gap: 6px; }
.options label { cursor: pointer; }
.options input { position: absolute; opacity: 0; }
.options span { display: block; padding: 7px 12px; border: 1px solid var(--line); border-radius: 8px; color: var(--ink-dim); font-weight: 500; }
.options label:hover span { border-color: var(--brand); }
.options input:checked + span { background: var(--brand); border-color: var(--brand); color: var(--on-brand); font-weight: 600; }
.options input:focus-visible + span { outline: 2px solid var(--ink); outline-offset: 2px; }

.field { margin-bottom: 8px; }
.field label { display: block; margin-bottom: 4px; }
.unit { color: var(--ink-faint); font-weight: 400; margin-left: 4px; }
input:not([type=radio]), select {
  width: 100%;
  padding: 10px 12px;
  font: inherit;
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
}
input::placeholder { color: var(--ink-faint); }
input:focus, select:focus { outline: 2px solid var(--brand); outline-offset: 0; border-color: var(--brand); }
.has-error input { border-color: var(--error); }
.note { min-height: 20px; margin: 3px 0 0; font-size: 13px; color: var(--ink-faint); }
.error { color: var(--error); }
.section-note { font-size: 14px; color: var(--ink-dim); }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

button {
  width: 100%;
  margin-top: 6px;
  padding: 12px;
  font: inherit;
  font-weight: 700;
  color: var(--on-brand);
  background: var(--brand);
  border: 0;
  border-radius: 8px;
  cursor: pointer;
}
button:hover { filter: brightness(1.08); }
button:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }

.result h2 { margin-bottom: 12px; }
.empty { display: flex; align-items: center; justify-content: center; min-height: 160px; margin: 0; padding: 16px; text-align: center; color: var(--ink-faint); border: 1px dashed var(--line); border-radius: 10px; }
.tag { display: inline-block; padding: 2px 7px; margin-left: 6px; font-family: var(--body); font-size: 11px; font-weight: 600; letter-spacing: 0; color: var(--brand); border: 1px solid var(--brand); border-radius: 5px; vertical-align: 2px; }
.basis .tag { margin-left: 0; margin-right: 4px; vertical-align: 1px; }

table { width: 100%; border-collapse: collapse; font-size: 15px; }
th { text-align: left; font-size: 12px; font-weight: 600; color: var(--ink-faint); }
th, td { padding: 9px 6px; border-bottom: 1px solid var(--line); }
tr:last-child td { border-bottom: 0; }
.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.strong { font-weight: 600; }
.z { display: inline-flex; align-items: center; justify-content: center; width: 26px; height: 26px; border-radius: 7px; font-family: var(--display); font-weight: 800; font-size: 14px; color: var(--on-brand); }
.z.z1 { background: var(--z1); }
.z.z2 { background: var(--z2); }
.z.z3 { background: var(--z3); }
.z.z4 { background: var(--z4); }
.z.z5 { background: var(--z5); }
@media (max-width: 480px) {
  form, .result { padding: 16px; }
  table { font-size: 13px; }
  th, td { padding: 7px 3px; }
  .num { white-space: normal; }
}

.big { display: flex; flex-wrap: wrap; gap: 12px 32px; margin: 0 0 14px; }
.big dt { font-size: 13px; color: var(--ink-dim); }
.big dd { margin: 0; font-family: var(--display); font-weight: 800; font-size: 44px; line-height: 1.1; color: var(--brand); font-variant-numeric: tabular-nums; }
.big small { font-size: 16px; font-weight: 600; color: var(--ink-dim); margin-left: 2px; }

.basis { font-size: 14px; color: var(--ink-dim); margin: 12px 0 0; }
.disclaimer { font-size: 13px; color: var(--ink-faint); margin: 14px 0 0; }

main { padding-bottom: 40px; }

/* How to get your numbers */
.tips { margin-top: 24px; padding: 24px; background: var(--surface); border: 1px solid var(--line); border-radius: 18px; }
.tips h3 { margin: 0 0 6px; font-family: var(--display); font-weight: 700; font-size: 16px; color: var(--brand); }
.tip-grid { display: grid; gap: 20px 28px; margin-top: 14px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.tip p { margin: 0; font-size: 15px; color: var(--ink-dim); }
@media (max-width: 480px) { .tips { padding: 16px; } .tip-grid { grid-template-columns: minmax(0, 1fr); } }

/* Watch setup */
.card.wide { flex-direction: row; align-items: center; gap: 16px; margin-bottom: 16px; padding: 22px 24px; }
.card.wide .blurb { display: block; margin: 4px 0 0; }
.card.wide .go { margin: 0 0 0 auto; white-space: nowrap; }
.watch-grid { display: grid; gap: 16px; align-items: start; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.watch { position: relative; overflow: hidden; padding: 24px; background: var(--surface); border: 1px solid var(--line); border-radius: 18px; }
.watch::before { content: ""; position: absolute; inset: 0 0 auto; height: 4px; background: var(--brand); }
.watch h2 { font-size: 24px; }
.watch-intro { margin: 8px 0 0; color: var(--ink-dim); font-size: 15px; }
.watch h3 { margin: 18px 0 6px; font-family: var(--display); font-weight: 700; font-size: 16px; color: var(--brand); }
.watch ol { margin: 0; padding-left: 20px; font-size: 15px; color: var(--ink-dim); }
.watch li + li { margin-top: 4px; }
.watch-note { margin-top: 16px; }
.watch-link { margin: 16px 0 0; font-weight: 600; }
.watch-link a { color: var(--brand); }
@media (max-width: 900px) { .watch-grid { grid-template-columns: minmax(0, 1fr); } }
@media (max-width: 600px) { .card.wide { flex-direction: column; align-items: flex-start; } .card.wide .go { margin-left: 0; } }

/* Session of the week */
.session-purpose { margin: 0 0 8px; }
.set { margin: 14px 0 2px; font-family: var(--display); font-weight: 700; font-size: 15px; color: var(--brand); }
.cue { display: block; font-size: 13px; color: var(--ink-faint); }

.set-block { margin-bottom: 18px; }