/* Neta Nerd palette — change colors here. */
:root {
  --bg: #0b0d0f;
  --bg-deep: #070809;
  --panel: #14181c;
  --panel-2: #1b2126;
  --panel-3: #232a31;
  --line: #2e3740;
  --line-strong: #46515c;
  --text: #e7ecef;
  --text-dim: #b7c0c8;
  --text-faint: #8e99a3;
  --amber: #ffb000;
  --amber-2: #ffc44d;
  --amber-ink: #1a1200;
  --cyan: #00e5ff;
  --cyan-ink: #041316;
  --magenta: #ff4fd8;
  --phase-a: #ffb000;
  --phase-b: #00e5ff;
  --phase-c: #ff4fd8;
  --ok: #3ddc84;
  --ok-bg: #10261a;
  --bad: #ff4b4b;
  --bad-bg: #2a1214;
  --white: #f4f7f8;
  --header-h: 58px;
  --font: system-ui, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", "SFMono-Regular", Menlo, Consolas, monospace;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

*, *::before, *::after { box-sizing: border-box; border-radius: 0; }
html { color-scheme: dark; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text); font-family: var(--font); }
body { min-height: 100vh; line-height: 1.5; }
img, svg { max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; border-radius: 0; }
a { color: var(--cyan); text-underline-offset: 3px; }
a:hover { color: var(--white); }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }

.skip {
  position: absolute; left: 12px; top: -40px; background: var(--amber); color: var(--amber-ink);
  padding: 8px 12px; z-index: 100;
}
.skip:focus { top: 8px; }

#phase-bg {
  position: fixed; inset: 0; z-index: 0; width: 100%; height: 100%;
  pointer-events: none; display: block;
}

.site-header, .wrap, .site-footer { position: relative; z-index: 1; }
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: rgba(11, 13, 15, 0.94);
  border-bottom: 2px solid var(--amber);
}
.hazard {
  height: 6px;
  background: repeating-linear-gradient(-45deg, var(--amber) 0 8px, #1a1200 8px 16px);
}
.header-in, .wrap, .footer-in {
  width: min(820px, calc(100% - 28px));
  margin: 0 auto;
}
.header-in {
  min-height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: inherit; }
.brand svg { width: 36px; height: 36px; flex: none; }
.word { display: flex; flex-direction: column; line-height: 1.05; }
.word b { color: var(--amber); letter-spacing: 0.12em; font-size: 1.05rem; }
.word i { color: var(--cyan); font-style: normal; letter-spacing: 0.22em; font-size: 0.78rem; }
.header-meta { color: var(--text-dim); font-family: var(--mono); font-size: 0.75rem; letter-spacing: 0.08em; }

.wrap { padding: 22px 0 64px; }
.kicker {
  font-family: var(--mono); color: var(--cyan); letter-spacing: 0.14em;
  text-transform: uppercase; font-size: 0.72rem; margin: 0 0 8px;
}
h1, h2, h3 { line-height: 1.2; font-weight: 700; }
h1 { font-size: clamp(1.8rem, 4vw, 2.5rem); margin: 0 0 10px; }
h2 { font-size: 1.25rem; margin: 0 0 8px; }
.lede { color: var(--text-dim); font-size: 1.05rem; max-width: 62ch; }

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 16px;
  position: relative;
  box-shadow: var(--shadow);
}
.panel + .panel, .stack > * + * { margin-top: 14px; }
.panel::before, .panel::after {
  content: ""; position: absolute; width: 12px; height: 12px; pointer-events: none;
}
.panel::before { top: -1px; left: -1px; border-top: 2px solid var(--amber); border-left: 2px solid var(--amber); }
.panel::after { right: -1px; bottom: -1px; border-right: 2px solid var(--cyan); border-bottom: 2px solid var(--cyan); }

.row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.btn, .choice, .chip, .dot {
  border: 1px solid var(--line-strong);
  background: var(--panel-2);
  color: var(--text);
  cursor: pointer;
  text-align: left;
}
.btn {
  padding: 12px 16px; min-height: 44px;
  font-weight: 750; letter-spacing: 0.06em; text-transform: uppercase; font-size: 0.78rem;
  text-decoration: none; display: inline-flex; align-items: center; justify-content: center;
}
.btn.primary { background: var(--amber); color: var(--amber-ink); border-color: var(--amber); }
.btn.primary:hover { background: var(--amber-2); }
.btn.ghost { background: transparent; color: var(--cyan); border-color: var(--cyan); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn.small { min-height: 36px; padding: 8px 10px; }

.chip {
  padding: 8px 10px; min-height: 40px; font-size: 0.86rem;
}
.chip[aria-pressed="true"] {
  background: var(--amber); color: var(--amber-ink); border-color: var(--amber); font-weight: 700;
}
.chip.domain[aria-pressed="true"] { background: transparent; color: var(--cyan); border-color: var(--cyan); box-shadow: inset 3px 0 0 var(--cyan); }

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.stat { background: var(--panel-2); border: 1px solid var(--line); padding: 10px; }
.stat b { display: block; color: var(--amber); font-size: 1.25rem; }
.stat span { color: var(--text-dim); font-size: 0.78rem; }

.topics { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.topic-card {
  display: block; padding: 12px; background: var(--panel-2); border: 1px solid var(--line);
  color: inherit; text-decoration: none; min-height: 72px;
}
.topic-card:hover { border-color: var(--amber); }
.topic-card strong { display: block; }
.topic-card span { color: var(--text-dim); font-size: 0.8rem; }

.q-top {
  position: sticky; top: calc(var(--header-h) + 6px); z-index: 5;
  background: rgba(11, 13, 15, 0.92); padding-bottom: 8px;
}
.meta { font-family: var(--mono); color: var(--text-faint); font-size: 0.78rem; }
.progress {
  height: 8px; background: var(--panel-3); border: 1px solid var(--line); margin: 8px 0;
}
.progress > i { display: block; height: 100%; background: var(--amber); width: 0; }
.stem { font-size: 1.08rem; margin: 8px 0 12px; }
.choice {
  display: flex; gap: 10px; width: 100%; padding: 12px; min-height: 48px; margin: 0 0 8px;
}
.choice .key { font-family: var(--mono); color: var(--amber); flex: none; }
.choice[aria-checked="true"] { border-color: var(--amber); box-shadow: inset 4px 0 0 var(--amber); }
.choice.good { border-color: var(--ok); background: var(--ok-bg); box-shadow: inset 4px 0 0 var(--ok); }
.choice.bad { border-color: var(--bad); background: var(--bad-bg); box-shadow: inset 4px 0 0 var(--bad); }
.feedback { border: 1px solid var(--line); padding: 12px; background: var(--panel-2); }
.feedback.good { border-color: var(--ok); }
.feedback.bad { border-color: var(--bad); }
.feedback h3 { margin: 0 0 6px; }
.ref { font-family: var(--mono); font-size: 0.82rem; color: var(--text-dim); }

.dots { display: flex; flex-wrap: wrap; gap: 4px; }
.dot { width: 36px; height: 36px; padding: 0; text-align: center; font-family: var(--mono); font-size: 0.72rem; }
.dot.on { color: var(--text); border-color: var(--text-dim); }
.dot.here { border-color: var(--amber); color: var(--amber); }

.timer { font-family: var(--mono); color: var(--amber); font-size: 1.1rem; }
.timer.low { color: var(--bad); }

.score-num { font-size: 2.4rem; color: var(--amber); margin: 0; }
.miss-list { list-style: none; padding: 0; margin: 0; }
.miss-list li { border-top: 1px solid var(--line); padding: 10px 0; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin: 0 0 12px; }
.tags .meta.id { margin-left: auto; }
.tag {
  display: inline-block; border: 1px solid var(--line); padding: 2px 8px;
  font-family: var(--mono); font-size: 0.72rem; color: var(--text-dim); letter-spacing: 0.03em;
}
.tag.level { color: var(--amber-ink); background: var(--amber); border-color: var(--amber); font-weight: 700; }
.tag.domain { color: var(--cyan); border-color: var(--cyan); }
.tag.topic { color: var(--text); border-color: var(--line-strong); }
.tag.ok { color: var(--ok); border-color: var(--ok); }
.tag.bad { color: var(--bad); border-color: var(--bad); }
.feedback .tags { margin-bottom: 8px; }
.miss-list .tag { margin: 0 6px 6px 0; }

.study h1, .study h2, .study h3 { margin-top: 1.2em; }
.study h2 { border-top: 1px solid var(--line); padding-top: 12px; }
.study p, .study li { max-width: 72ch; }
.study code { font-family: var(--mono); color: var(--amber-2); }
.study pre {
  background: var(--bg-deep); border: 1px solid var(--line); padding: 12px; overflow-x: auto;
}
.study table { border-collapse: collapse; width: 100%; font-size: 0.92rem; }
.study th, .study td { border: 1px solid var(--line); padding: 6px 8px; text-align: left; }
.study blockquote {
  margin: 0; border-left: 3px solid var(--amber); padding-left: 12px; color: var(--text-dim);
}

.site-footer {
  border-top: 1px solid var(--line); background: var(--bg-deep); padding: 22px 0 40px;
}
.site-footer p { color: var(--text-faint); font-size: 0.85rem; max-width: 78ch; }
.footer-links { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 8px; }

.filter-label { color: var(--text-dim); font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; width: 100%; }

@media (max-width: 640px) {
  .stats, .topics { grid-template-columns: 1fr; }
  .header-meta { display: none; }
  .wrap { width: min(820px, calc(100% - 20px)); }
}
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto; }
}