:root {
  --bg: #0c110f;
  --bg-deep: #0c110f;
  --surface: #131a16;
  --surface-raised: #1b241f;
  --surface-soft: #101613;
  --text: #e7eee9;
  --muted: #9ba7a1;
  --line: #26302b;
  --line-strong: #37423c;
  --accent: #b8f36b;
  --accent-strong: #9fd66a;
  --accent-soft: rgba(184, 243, 107, .12);
  --accent-text: #0c110f;
  --ok: #9fd66a;
  --bad: #f0a893;
  --code: #101613;
  --shadow: none;
  --radius: 16px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(circle at 12% 0%, rgba(184, 243, 107, .08), transparent 28rem),
    radial-gradient(circle at 90% 18%, rgba(72, 117, 31, .1), transparent 30rem),
    var(--bg);
  color: var(--text);
  font: 16px/1.6 "DM Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .24;
  background-image: linear-gradient(rgba(184, 243, 107, .025) 1px, transparent 1px), linear-gradient(90deg, rgba(184, 243, 107, .025) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(to bottom, black, transparent 72%);
}
a { color: inherit; }
.muted { color: var(--muted); }

.top {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px max(20px, calc((100% - 1120px) / 2));
  background: rgba(12, 17, 15, .92);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(55, 66, 60, .7);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-weight: 750;
  font-size: 1.18rem;
  text-decoration: none;
  letter-spacing: .03em;
}
.brand-icon { width: 26px; height: 26px; display: block; border-radius: 7px; box-shadow: 0 0 18px rgba(184, 243, 107, .22); }
nav { display: flex; gap: 18px; align-items: center; }
nav a { text-decoration: none; color: var(--muted); font-size: .93rem; transition: color .2s ease; }
nav a:hover { color: var(--text); }
nav .pill {
  color: var(--accent-text);
  background: var(--accent);
  padding: 6px 14px;
  border-radius: 999px;
  font-weight: 750;
  box-shadow: 0 0 24px rgba(184, 243, 107, .16);
}
.lang { border: 1px solid var(--line-strong); background: var(--surface); color: var(--text); border-radius: 9px; padding: 4px 9px; cursor: pointer; }

main > section { max-width: 1120px; margin: 0 auto; padding: 76px 20px; }
.hero {
  min-height: 620px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
}
.hero::after {
  content: "PRIVATE / LOCAL-FIRST / VERIFIED";
  position: absolute;
  right: 20px;
  top: 50%;
  writing-mode: vertical-rl;
  color: rgba(184, 243, 107, .46);
  font: 11px/1.4 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: .24em;
  transform: translateY(-50%);
}
h1 { max-width: 820px; font-size: clamp(3rem, 8vw, 6.5rem); line-height: .98; letter-spacing: -.065em; margin: 12px 0 22px; }
h2 { font-size: clamp(1.8rem, 4vw, 2.55rem); letter-spacing: -.035em; margin: 0 0 10px; }
h3 { margin: 0 0 8px; font-size: 1.08rem; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--accent);
  font: 700 .75rem/1.2 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: .13em;
  text-transform: uppercase;
  margin: 0;
}
.eyebrow::before { content: ""; width: 25px; height: 1px; background: var(--accent); box-shadow: 0 0 10px var(--accent); }
.lead { font-size: clamp(1.05rem, 2vw, 1.25rem); color: var(--muted); max-width: 760px; }
.cta { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.button {
  display: inline-block;
  border: 1px solid var(--accent);
  border-radius: 10px;
  padding: 11px 18px;
  background: var(--accent);
  color: var(--accent-text);
  font: inherit;
  font-weight: 750;
  text-decoration: none;
  cursor: pointer;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.button:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(184, 243, 107, .16); background: #c7f987; }
.button.ghost { background: transparent; color: var(--text); border-color: var(--line-strong); }
.button.ghost:hover { border-color: var(--accent); color: var(--accent); box-shadow: none; }
.button:disabled { opacity: .6; cursor: progress; transform: none; }

.features, .demos, .apply { border-top: 1px solid var(--line); }
.features > h2, .demos > h2, .apply > h2 { max-width: 650px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 14px; margin-top: 26px; }
.grid article, .demo, form {
  background: linear-gradient(145deg, rgba(19, 26, 22, .96), rgba(16, 22, 19, .96));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}
.grid article { position: relative; overflow: hidden; }
.grid article::before { content: ""; position: absolute; top: 0; left: 22px; width: 32px; height: 2px; background: var(--accent); box-shadow: 0 0 15px rgba(184, 243, 107, .75); }
.grid article h3 { padding-top: 5px; }
.grid p { margin: 0; color: var(--muted); }
.demo { margin-top: 16px; }
.demo h3::before { content: "// "; color: var(--accent); font-family: ui-monospace, monospace; }
textarea, input, select {
  width: 100%;
  font: inherit;
  color: var(--text);
  background: var(--surface-soft);
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  padding: 10px 12px;
}
textarea:focus, input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
.label { margin: 12px 0 4px; font-weight: 650; font-size: .9rem; }
.out { display: block; background: var(--code); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; white-space: pre-wrap; word-break: break-word; min-height: 2.6em; }
.out mark { background: var(--accent-soft); color: var(--accent); border-radius: 4px; padding: 0 3px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0; }
.chips button { border: 1px solid var(--line-strong); background: var(--surface-soft); color: var(--muted); border-radius: 999px; padding: 3px 10px; cursor: pointer; font: inherit; font-size: .85rem; }
.chips button:hover { color: var(--accent); border-color: var(--accent); }
.bars { display: grid; gap: 6px; }
.bar { display: grid; grid-template-columns: 90px 1fr 48px; align-items: center; gap: 10px; font-size: .92rem; }
.bar .track { height: 10px; background: var(--surface-soft); border-radius: 99px; overflow: hidden; }
.bar .fill { display: block; height: 100%; background: var(--muted); border-radius: 99px; transition: width .35s ease; }
.bar.win { font-weight: 700; color: var(--accent); }
.bar.win .fill { background: var(--accent); box-shadow: 0 0 14px rgba(184, 243, 107, .55); }
.route-why {
  margin: 16px 0 0;
  padding: 12px 14px;
  border-left: 2px solid var(--accent);
  background: rgba(184, 243, 107, .06);
  color: var(--muted);
  font-size: .93rem;
}
.log { list-style: none; padding: 0; margin: 14px 0 0; font-family: ui-monospace, Consolas, monospace; font-size: .88rem; }
.log li { padding: 5px 0; border-bottom: 1px dashed var(--line); animation: in .25s ease; }
.log .ok { color: var(--ok); } .log .bad { color: var(--bad); }
@keyframes in { from { opacity: 0; transform: translateY(4px); } }

.game-heading { display: flex; justify-content: space-between; gap: 18px; align-items: flex-start; }
.game-badge {
  flex: 0 0 auto;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 5px 9px;
  color: var(--accent);
  font: 700 10px/1 ui-monospace, monospace;
  letter-spacing: .12em;
}
#game-canvas {
  display: block;
  width: 100%;
  height: auto;
  margin-top: 18px;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  background: var(--code);
  outline: none;
}
#game-canvas:focus { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(184, 243, 107, .12); }
.game-status { margin: 12px 0 0; color: var(--muted); font: 12px/1.5 ui-monospace, monospace; }

form { display: grid; gap: 14px; margin-top: 16px; }
.leaderboard {
  margin-top: 16px;
  padding: 18px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(184, 243, 107, .09), rgba(19, 26, 22, .96));
}
.leaderboard-heading { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; }
.leaderboard-heading .eyebrow { margin-bottom: 6px; font-size: .65rem; }
.leaderboard-heading h3 { margin: 0; }
.leaderboard-lock { border: 1px solid var(--line-strong); border-radius: 999px; padding: 5px 9px; color: var(--accent); font: 700 10px/1 ui-monospace, monospace; letter-spacing: .1em; white-space: nowrap; }
.leaderboard-row { display: grid; grid-template-columns: 44px 1fr auto; gap: 12px; align-items: center; margin-top: 16px; padding: 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface-soft); }
.leaderboard-rank { color: var(--accent); font: 700 13px ui-monospace, monospace; }
.leaderboard-row strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.leaderboard-row span:last-child { color: var(--muted); font-size: .85rem; }
.leaderboard-note { margin: 12px 0 0; font-size: .82rem; }
label { display: grid; gap: 4px; font-weight: 650; font-size: .92rem; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.check { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; color: var(--muted); }
.check input { width: auto; margin-top: 5px; accent-color: var(--accent-strong); }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.msg { margin: 0; min-height: 1.5em; }
.msg.ok { color: var(--ok); } .msg.bad { color: var(--bad); }
.invalid { border-color: var(--bad); }
.privacy { margin-top: 16px; color: var(--muted); }
.privacy summary { cursor: pointer; }
.foot { max-width: 1120px; margin: 0 auto; padding: 24px 20px 42px; display: flex; justify-content: space-between; border-top: 1px solid var(--line); }

@media (max-width: 720px) {
  nav a:not(.pill) { display: none; }
  main > section { padding: 58px 16px; }
  .hero { min-height: 560px; }
  .hero::after { display: none; }
  h1 { font-size: clamp(2.8rem, 15vw, 5rem); }
  .row { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; scroll-behavior: auto !important; } }