/* Dit: a signal lamp at night. Navy, cream, one amber lamp. System fonts only, so there is nothing to download. */
:root {
  --night: #10162a;
  --deck: #1a2340;
  --rail: #2c3962;
  --cream: #f4ecd8;
  --dim: #aab3cf;
  --lamp: #f2b441;
  --lamp-ink: #2a1d00;
  --good: #8fd6a4;
  --miss: #ffb4a2;
  --r: 14px;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: "Avenir Next", "Segoe UI", system-ui, -apple-system, sans-serif;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; } /* a class that sets display must never defeat the hidden attribute */
html { background: var(--night); color: var(--cream); font: 17px/1.45 var(--sans); -webkit-text-size-adjust: 100%; }
body { margin: 0; }
.app { max-width: 460px; margin: 0 auto; padding: 16px 20px 40px; min-height: 100vh; }
.screen[hidden] { display: none; }

.top { display: flex; justify-content: space-between; align-items: center; min-height: 48px; }
.mark { font: 700 28px/1 var(--mono); letter-spacing: 0.04em; margin: 0; display: flex; align-items: center; gap: 10px; }
.lamp { width: 12px; height: 12px; border-radius: 50%; background: var(--lamp); box-shadow: 0 0 0 5px rgba(242, 180, 65, 0.18); }

button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; touch-action: manipulation; }
button:focus-visible, input:focus-visible { outline: 3px solid var(--lamp); outline-offset: 3px; }
.quiet { min-height: 44px; padding: 8px 12px; color: var(--dim); text-decoration: underline; text-underline-offset: 4px; border-radius: 8px; }
.quiet.danger { color: var(--miss); }
.go { display: block; width: 100%; min-height: 56px; margin-top: 16px; border-radius: var(--r); background: var(--lamp); color: var(--lamp-ink); font-weight: 700; font-size: 18px; }
.go.small { width: auto; min-height: 48px; padding: 0 22px; margin-top: 12px; }
.go:active { transform: translateY(1px); }

.tagline { margin: 0; color: var(--dim); font-size: 15px; }
.streak { margin: 24px 0 20px; }
.streak-n { font: 700 56px/1 var(--mono); margin: 0; }
.streak-n span + span { font: 500 18px/1 var(--sans); color: var(--dim); }
.note { color: var(--dim); font-size: 15px; margin: 8px 0 0; }

.card { background: var(--deck); border: 1px solid var(--rail); border-radius: var(--r); padding: 20px; }
.kicker { margin: 0; color: var(--dim); font-size: 14px; letter-spacing: 0.06em; text-transform: uppercase; }
.letters { font: 700 34px/1.2 var(--mono); margin: 6px 0 0; letter-spacing: 0.08em; }

.sub { font-size: 16px; margin: 32px 0 10px; color: var(--dim); font-weight: 600; }
.known { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); gap: 8px; }
.known li { background: var(--deck); border-radius: 10px; padding: 10px 12px; font-family: var(--mono); display: flex; justify-content: space-between; gap: 8px; }
.known li b { color: var(--lamp); }

.count { margin: 0; color: var(--dim); font: 15px var(--mono); }
.bar { height: 6px; background: var(--deck); border-radius: 3px; overflow: hidden; margin: 4px 0 28px; }
.bar span { display: block; height: 100%; width: 0; background: var(--lamp); transition: width 0.2s ease-out; }
.q { font-size: 22px; line-height: 1.25; margin: 0 0 12px; font-weight: 600; }
.code { font: 700 54px/1 var(--mono); letter-spacing: 0.18em; min-height: 58px; margin: 0 0 4px; color: var(--lamp); overflow-wrap: anywhere; }
.choices { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 20px; }
.choices[hidden], .keyer[hidden] { display: none; }
.choice { min-height: 64px; border-radius: var(--r); background: var(--deck); border: 2px solid var(--rail); font: 700 24px var(--mono); }
.choice[aria-pressed="true"] { border-color: var(--lamp); }
.choice.right { border-color: var(--good); color: var(--good); }
.choice.wrong { border-color: var(--miss); color: var(--miss); }

.keyer { margin-top: 20px; }
.typed { font: 700 40px/1 var(--mono); letter-spacing: 0.2em; min-height: 46px; margin: 0 0 14px; border-bottom: 2px solid var(--rail); padding-bottom: 8px; }
.keys { display: grid; grid-template-columns: 1fr 1.6fr; gap: 10px; }
.key { min-height: 84px; border-radius: var(--r); background: var(--deck); border: 2px solid var(--rail); font: 700 40px/1 var(--mono); }
.key:active { background: var(--rail); }
.row { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-top: 8px; }

.feedback { min-height: 26px; margin: 18px 0 0; font-weight: 600; }
.feedback.right { color: var(--good); }
.feedback.wrong { color: var(--miss); }

.big { font: 700 40px/1.1 var(--mono); margin: 64px 0 12px; }
.lead { font-size: 20px; margin: 0; }

dialog { width: min(420px, calc(100vw - 32px)); border: 1px solid var(--rail); border-radius: var(--r); background: var(--deck); color: var(--cream); padding: 22px; }
dialog::backdrop { background: rgba(6, 9, 20, 0.7); }
dialog h2 { margin: 0 0 12px; font-size: 22px; }
.check { display: flex; align-items: center; gap: 12px; min-height: 44px; }
.check input { width: 22px; height: 22px; accent-color: var(--lamp); }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }