:root {
  --bg: #080b0e;
  --elev: #141c24;
  --ink: #eef4f7;
  --muted: #9aadb8;
  --signal: #ff6a3d;
  --ok: #3ee0b0;
  --line: rgba(255, 255, 255, 0.08);
  --font: "Manrope", system-ui, sans-serif;
  --display: "Unbounded", system-ui, sans-serif;
  --max: 1100px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
  overflow-x: hidden;
}
a { color: var(--signal); text-decoration: none; }
h1, h2 { font-family: var(--display); letter-spacing: -0.03em; overflow-wrap: anywhere; }
h1 { font-size: clamp(1.45rem, 4vw, 2.2rem); }
img, svg, video { max-width: 100%; }
.bar {
  position: sticky; top: 0; z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(8,11,14,.92); backdrop-filter: blur(12px);
}
.bar__inner {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
  min-height: 64px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 0;
}
.bar nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  align-items: center;
  font-size: .95rem;
}
.brand { color: var(--ink); font-family: var(--display); white-space: nowrap; }
.brand span { color: var(--signal); font-size: .75rem; margin-left: 6px; }
.who { color: var(--muted); max-width: 16ch; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bell { background: var(--signal); color: #1a0b06; border-radius: 999px; padding: 0 8px; font-weight: 700; }
.burger {
  display: none;
  width: 42px; height: 42px;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 9px;
  cursor: pointer;
}
.burger span { display: block; height: 2px; background: var(--ink); margin: 5px 0; }
.shell { width: min(var(--max), calc(100% - 32px)); margin: 24px auto 64px; }
.dash { display: grid; gap: 28px; }
.muted { color: var(--muted); }
.eyebrow { color: var(--signal); letter-spacing: .16em; text-transform: uppercase; font-size: .75rem; }
.alert { color: #ff8a8a; }
.ok { color: var(--ok); }
.stack { display: grid; gap: 12px; }
.stack label, fieldset { display: grid; gap: 6px; color: var(--muted); border: 0; padding: 0; }
input, select, textarea, button {
  font: inherit; border-radius: 12px; border: 1px solid var(--line);
  background: #0e141a; color: var(--ink); padding: 10px 12px;
  max-width: 100%;
}
textarea { min-height: 120px; resize: vertical; }
button, .btn {
  background: var(--signal); color: #1a0b06; font-weight: 700; border: 0; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 16px; border-radius: 999px;
}
button.ghost, .ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.auth { max-width: 440px; }
.card { background: var(--elev); border: 1px solid var(--line); border-radius: 16px; padding: 20px; min-width: 0; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); gap: 16px; }
.meter { height: 8px; background: #0e141a; border-radius: 99px; overflow: hidden; }
.meter i { display: block; height: 100%; background: var(--signal); }
.plain { list-style: none; padding: 0; margin: 0; }
.plain li { padding: 10px 0; border-bottom: 1px solid var(--line); overflow-wrap: anywhere; }
.player { display: grid; grid-template-columns: minmax(0, 260px) minmax(0, 1fr); gap: 28px; align-items: start; }
.player aside { border-right: 1px solid var(--line); padding-right: 16px; min-width: 0; }
.toc { border: 0; }
.toc > summary {
  display: none;
  cursor: pointer;
  font-weight: 700;
  list-style: none;
  padding: 10px 0;
}
.toc > summary::-webkit-details-marker { display: none; }
.mod { color: var(--muted); font-size: .8rem; margin: 16px 0 8px; }
.l { display: flex; justify-content: space-between; gap: 8px; padding: 8px 0; color: var(--muted); }
.l.on { color: var(--ink); }
.l.locked { opacity: .45; }
.l em { font-style: normal; font-size: .75rem; color: var(--ok); flex-shrink: 0; }
.l.locked em { color: var(--muted); }
.theory h2 { font-size: 1.1rem; }
.task { margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--line); }
.check { display: flex; gap: 8px; align-items: flex-start; color: var(--ink); }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.row select, .row button { min-height: 44px; }
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table { width: 100%; border-collapse: collapse; min-width: 560px; }
th, td { text-align: left; padding: 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
.cert { border: 1px solid var(--signal); border-radius: 20px; padding: clamp(20px, 5vw, 40px); text-align: center; }
@media (max-width: 880px) {
  .burger { display: block; }
  .bar nav {
    display: none;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    padding: 8px 0 12px;
  }
  .nav-toggle:checked ~ nav { display: flex; }
  .bar nav a, .bar nav .who { padding: 8px 0; }
  .who { max-width: none; }
  .player { grid-template-columns: 1fr; }
  .player aside { border-right: 0; border-bottom: 1px solid var(--line); padding: 0 0 16px; }
  .toc { border: 1px solid var(--line); border-radius: 14px; padding: 0 14px 8px; background: var(--elev); }
  .toc > summary { display: block; }
  .shell { margin-top: 16px; }
  .cert { padding: 20px; }
}
@media (max-width: 480px) {
  .bar__inner, .shell { width: calc(100% - 24px); }
  .card, .task { padding: 16px; }
  button, .btn { width: 100%; }
  .row button { width: auto; flex: 1; }
}