:root {
  --bg: #0b1016;
  --surface: #121a24;
  --panel: #182230;
  --fg: #e8f4fa;
  --muted: #8aa3b5;
  --cyan: #35e0ff;
  --green: #39ff88;
  --amber: #ffb020;
  --red: #ff4d5e;
  --line: #1e3a4a;
  --sans: "Inter", ui-sans-serif, system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html {
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
  min-height: 100dvh;
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(53, 224, 255, 0.08), transparent 55%),
    var(--bg);
  color: var(--fg);
  font-family: var(--sans);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(53, 224, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(53, 224, 255, 0.035) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.55), transparent 88%);
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

h1, h2 { text-wrap: balance; margin: 0.3rem 0 0; }
p { text-wrap: pretty; }

.kicker {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0;
}

.muted { color: var(--muted); }
.mono { font-family: var(--mono); }

.hud {
  position: sticky;
  top: 0;
  z-index: 2;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  padding: 12px 16px 10px;
}

.hud-row, .segs { max-width: 48rem; margin: 0 auto; }
.hud-row { display: flex; justify-content: space-between; gap: 12px; }
.hud-name { margin: 2px 0 0; font-weight: 600; }
.hud-right { text-align: right; }
.segs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; margin-top: 10px; }
.seg { height: 6px; background: var(--panel); border-radius: 99px; overflow: hidden; }
.seg-fill { height: 100%; background: var(--cyan); }

.wrap { max-width: 48rem; margin: 0 auto; padding: 20px 16px 88px; }

.panel {
  position: relative;
  background: var(--surface);
  border: 1px solid color-mix(in srgb, var(--cyan) 22%, var(--line));
  border-radius: 28px;
  padding: 22px 20px;
  margin: 16px 0;
  box-shadow: 0 0 24px color-mix(in srgb, var(--cyan) 18%, transparent);
}

.panel::before, .panel::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border: 1.5px solid var(--cyan);
}
.panel::before { top: 10px; left: 10px; border-right: 0; border-bottom: 0; }
.panel::after { right: 10px; bottom: 10px; border-left: 0; border-top: 0; }

.grid2 { display: grid; gap: 10px; padding: 0; margin: 16px 0 0; list-style: none; }
.mini { border: 1px solid var(--line); background: var(--panel); border-radius: 14px; padding: 12px; }

label { display: grid; gap: 6px; margin: 12px 0; font-weight: 500; }
input, select {
  min-height: 44px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--fg);
  padding: 0 14px;
  font: 1rem var(--sans);
}
.check { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; }
.check input { width: 20px; height: 20px; accent-color: var(--cyan); margin-top: 2px; }
.error { color: var(--red); }

.btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  border-radius: 10px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
}
.btn:active:not(:disabled) { transform: scale(0.98); }
.btn.primary { background: var(--cyan); color: #052028; }
.btn.amber { background: var(--amber); color: #1a1204; }
.btn.ghost { background: transparent; color: var(--muted); border-color: var(--line); }

.options { display: grid; gap: 10px; margin-top: 16px; }
.option {
  min-height: 52px;
  display: flex;
  gap: 12px;
  text-align: left;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--fg);
  cursor: pointer;
  font-size: 1rem;
}
.option:disabled { cursor: default; }
.option.correct { border-color: var(--green); background: color-mix(in srgb, var(--green) 14%, var(--panel)); }
.option.wrong { border-color: var(--red); background: color-mix(in srgb, var(--red) 14%, var(--panel)); }
.letter {
  width: 28px; height: 28px; display: grid; place-items: center;
  border-radius: 6px; font-family: var(--mono); font-size: 0.78rem;
  color: var(--cyan); background: color-mix(in srgb, var(--cyan) 12%, transparent);
}

.feed { margin-top: 16px; padding: 12px 14px; border-radius: 14px; border: 1px solid var(--amber); }
.feed.ok { border-color: var(--green); }
.ok-text { color: var(--green); }
.actions { display: flex; justify-content: flex-end; margin-top: 16px; }
.center { text-align: center; }

.cert dl { display: grid; gap: 12px; }
.cert dt { font-family: var(--mono); font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); }
.cert dd { margin: 2px 0 0; font-weight: 600; }
.code { font-family: var(--mono); color: var(--cyan); font-size: 1.3rem; }

.stamp {
  width: 148px; height: 148px; margin: 18px auto 0;
  display: grid; place-items: center;
  border-radius: 999px; border: 4px solid var(--green); color: var(--green);
  font-family: var(--mono); font-weight: 700; text-transform: uppercase;
  transform: rotate(-12deg);
  animation: stamp-in 500ms ease both;
}

@keyframes stamp-in {
  from { opacity: 0; transform: rotate(-12deg) scale(1.18); }
  to { opacity: 1; transform: rotate(-12deg) scale(1); }
}

.hud-actions { display: flex; align-items: center; gap: 8px; }
.hud-btn { min-height: 40px; padding: 0 12px; font-size: 0.85rem; }
.doc h2 { font-size: 1.2rem; margin-top: 0; }
.doc ul, .doc ol { margin: 12px 0 0; padding-left: 1.2rem; line-height: 1.5; }
.doc li { margin: 0.4rem 0; }
.table-wrap { overflow-x: auto; margin-top: 12px; -webkit-overflow-scrolling: touch; }
table { width: 100%; min-width: 28rem; border-collapse: collapse; font-size: 0.92rem; }
th, td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; vertical-align: top; }
thead th, tbody th {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--cyan);
  background: color-mix(in srgb, var(--cyan) 8%, transparent);
}
tbody th { text-transform: none; letter-spacing: 0; font-size: 0.92rem; color: var(--fg); white-space: nowrap; }

.status { margin-top: 12px; }
.reset {
  position: fixed; right: 16px; bottom: 16px;
  min-height: 44px; padding: 0 14px;
  background: transparent; color: var(--muted);
  border: 1px solid var(--line); border-radius: 10px; cursor: pointer;
}

dialog {
  background: var(--surface);
  color: var(--fg);
  border: 1px solid var(--cyan);
  border-radius: 18px;
  padding: 20px;
  max-width: 26rem;
}
dialog menu { display: flex; gap: 8px; justify-content: flex-end; padding: 0; }

@media (min-width: 640px) {
  .grid2, .cert dl { grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .stamp, .btn, .option { animation: none !important; transition: none !important; }
  .stamp { transform: rotate(-12deg); opacity: 1; }
}