:root {
  --ink: #0F1222;
  --card: #181C33;
  --card-2: #20254A;
  --line: #2C3260;
  --text: #EDEFF7;
  --dim: #A3A9C8;
  --lime: #C6F432;
  --violet: #8B7CFF;
  --head: "Space Grotesk", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; color: var(--text); font: 400 17px/1.6 var(--head);
  background: radial-gradient(900px 500px at 85% -10%, rgba(139, 124, 255, .22), transparent 60%), radial-gradient(700px 400px at -10% 110%, rgba(198, 244, 50, .10), transparent 60%), var(--ink);
  min-height: 100vh;
}
a { color: var(--lime); }
:focus-visible { outline: 3px solid var(--lime); outline-offset: 3px; border-radius: 6px; }

.shell { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.bar { display: flex; align-items: center; justify-content: space-between; padding: 22px 0; }
.logo { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font: 700 22px/1 var(--head); letter-spacing: -.5px; }
.logo svg { width: 34px; height: 34px; }
.logo .word span { color: var(--dim); font-weight: 500; }
.bar nav { display: flex; gap: 6px; background: var(--card); border: 1px solid var(--line); border-radius: 999px; padding: 4px; }
.bar nav a { color: var(--dim); text-decoration: none; font-weight: 500; font-size: 15px; padding: 7px 16px; border-radius: 999px; }
.bar nav a[aria-current] { background: var(--lime); color: var(--ink); }

.grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: 24px; padding: 24px 0 40px; align-items: start; }
.intro h1 { font: 700 clamp(40px, 6vw, 64px)/1.02 var(--head); letter-spacing: -2px; margin: 0 0 18px; }
.hl { color: var(--lime); }
.hl.v { color: var(--violet); }
.intro > p { color: var(--dim); font-size: 18px; max-width: 520px; margin: 0 0 28px; }

.controls { display: grid; gap: 22px; background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 22px; }
.field { border: 0; margin: 0; padding: 0; min-width: 0; }
.field label, .field legend { font: 600 13px/1 var(--mono); text-transform: uppercase; letter-spacing: 1.5px; color: var(--dim); margin-bottom: 12px; display: block; padding: 0; }
.score-row { display: grid; grid-template-columns: minmax(0, 1fr) 96px; gap: 14px; align-items: center; }
#score { font: 600 24px var(--mono); color: var(--ink); background: var(--lime); border: 0; border-radius: 12px; padding: 10px 8px; width: 100%; text-align: center; }
input[type=range] { -webkit-appearance: none; appearance: none; width: 100%; height: 10px; border-radius: 999px; background: linear-gradient(90deg, var(--violet) var(--fill, 50%), var(--line) var(--fill, 50%)); }
input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 26px; height: 26px; border-radius: 50%; background: var(--lime); border: 4px solid var(--ink); box-shadow: 0 0 0 2px var(--lime); cursor: pointer; }
input[type=range]::-moz-range-thumb { width: 22px; height: 22px; border-radius: 50%; background: var(--lime); border: 4px solid var(--ink); cursor: pointer; }
.seg { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }
.seg label { margin: 0; text-transform: none; letter-spacing: 0; }
.seg input { position: absolute; opacity: 0; }
.seg span { display: block; text-align: center; background: var(--card-2); border: 1px solid var(--line); border-radius: 12px; padding: 10px 6px; font: 600 16px var(--mono); color: var(--text); cursor: pointer; }
.seg small { display: block; font: 400 12px var(--head); color: var(--dim); margin-top: 2px; }
.seg input:checked + span { border-color: var(--lime); box-shadow: inset 0 0 0 1px var(--lime); }
.seg input:focus-visible + span { outline: 3px solid var(--lime); outline-offset: 2px; }
.error { color: #FF9A8B; margin: 0; font-weight: 500; }

.panel { background: linear-gradient(160deg, var(--card-2), var(--card)); border: 1px solid var(--line); border-radius: 24px; padding: 26px 24px; text-align: center; }
#gauge { width: 100%; max-width: 340px; display: block; margin: 0 auto; }
.big { font: 600 clamp(44px, 6vw, 60px)/1 var(--mono); color: var(--lime); margin: 6px 0 4px; letter-spacing: -1px; }
.sub { color: var(--dim); margin: 0 0 20px; }
.sub span { color: var(--text); font-weight: 700; }
.facts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; margin: 0; }
.facts div { background: rgba(15, 18, 34, .55); border: 1px solid var(--line); border-radius: 14px; padding: 12px 8px; }
.facts dt { font-size: 12px; color: var(--dim); }
.facts dd { margin: 4px 0 0; font: 600 22px var(--mono); color: var(--text); }
.equiv { font-size: 14px; color: var(--dim); margin: 16px 0 0; }

.tiers { grid-column: 1 / -1; background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 22px; }
.tiers h2, .promo h2 { font: 700 24px/1.15 var(--head); letter-spacing: -.5px; margin: 0 0 16px; }
.tiers ol { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.tiers li { background: var(--card-2); border: 1px solid var(--line); border-radius: 14px; padding: 14px; }
.tiers li b { display: block; font-size: 16px; }
.tiers li .lvl { font: 500 13px var(--mono); color: var(--dim); }
.meter { height: 8px; background: var(--line); border-radius: 999px; margin: 12px 0 8px; overflow: hidden; }
.meter i { display: block; height: 100%; background: var(--violet); border-radius: 999px; }
.tiers li.ok .meter i { background: var(--lime); }
.tiers li .st { font: 600 13px var(--mono); color: var(--dim); }
.tiers li.ok .st { color: var(--lime); }
.fine { font-size: 13px; color: var(--dim); margin: 14px 0 0; }

.promo { grid-column: 1 / -1; border: 1px dashed var(--violet); border-radius: 20px; padding: 24px; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 6px 24px; align-items: center; }
.promo .tag { grid-column: 1 / -1; margin: 0; font: 600 13px var(--mono); color: var(--violet); text-transform: uppercase; letter-spacing: 1.5px; }
.promo h2 { margin: 0; }
.promo p:not(.tag) { margin: 0; color: var(--dim); grid-column: 1; }
.promo .go { grid-column: 2; grid-row: 2 / span 2; }
.go { display: inline-block; background: var(--lime); color: var(--ink); font-weight: 700; text-decoration: none; padding: 14px 22px; border-radius: 14px; white-space: nowrap; }
.go:hover { background: #D8FF5A; }

.qa { max-width: 760px; padding: 24px 0 40px; }
.qa h1 { font: 700 clamp(38px, 6vw, 56px)/1.05 var(--head); letter-spacing: -2px; margin: 0 0 10px; }
.lead { color: var(--dim); margin: 0 0 26px; font-size: 18px; }
details { background: var(--card); border: 1px solid var(--line); border-radius: 16px; margin-bottom: 10px; }
summary { cursor: pointer; list-style: none; padding: 16px 52px 16px 18px; font-weight: 700; font-size: 18px; position: relative; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 18px; top: 50%; transform: translateY(-50%); font: 600 22px var(--mono); color: var(--lime); }
details[open] summary::after { content: "−"; }
details p { margin: 0; padding: 0 18px 18px; color: var(--dim); }
.qa .go { margin-top: 18px; }

.end { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; border-top: 1px solid var(--line); padding: 22px 0 36px; font-size: 14px; color: var(--dim); }

@media (max-width: 860px) {
  .grid { grid-template-columns: 1fr; }
  .tiers ol { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .promo { grid-template-columns: 1fr; }
  .promo .go { grid-column: 1; grid-row: auto; justify-self: start; margin-top: 10px; }
}
@media (max-width: 480px) {
  .tiers ol { grid-template-columns: 1fr; }
  .facts dd { font-size: 18px; }
  .controls, .tiers, .promo { padding: 18px; }
  .go { white-space: normal; }
}

/* Guide content below the meter */
.eyebrow { margin: 6px 0 14px; font: 600 13px/1.3 var(--mono); text-transform: uppercase; letter-spacing: 1.8px; color: var(--violet); }
.guide { max-width: 860px; margin: 0 auto; padding: 8px 0 40px; }
.guide section { padding: 34px 0 6px; border-top: 1px solid var(--line); }
.guide section:first-child { border-top: 0; }
.guide h2 { font: 700 clamp(26px, 3.4vw, 34px)/1.15 var(--head); letter-spacing: -1px; margin: 0 0 14px; }
.guide p { color: #CDD1E6; margin: 0 0 14px; }
.guide strong { color: var(--text); }
.guide .note { font-size: 14px; color: var(--dim); }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 16px; margin: 6px 0 14px; background: var(--card); }
.guide table { width: 100%; border-collapse: collapse; font-size: 15px; min-width: 560px; }
.guide th, .guide td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--line); white-space: nowrap; }
.guide thead th { font: 600 12px var(--mono); text-transform: uppercase; letter-spacing: 1px; color: var(--dim); background: var(--card-2); }
.guide tbody th { font: 600 16px var(--mono); color: var(--lime); }
.guide tbody td { font-family: var(--mono); color: var(--text); }
.guide tbody tr:last-child th, .guide tbody tr:last-child td { border-bottom: 0; }
.guide tr.mark { background: rgba(139, 124, 255, .12); }
.scales { list-style: none; padding: 0; margin: 4px 0 16px; display: grid; gap: 8px; }
.scales li { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 12px 16px; color: #CDD1E6; }
.scales b { display: inline-block; min-width: 64px; font-family: var(--mono); color: var(--lime); }
.faq details p { color: var(--dim); }
.guide .promo { margin-top: 30px; }