:root,
[data-theme="dark"] {
  --void: #090a0c;
  --chrome: #12141a;
  --ink: #f2eee4;
  --muted: #9c968c;
  --faint: #6f6a62;
  --brass: #d4b57a;
  --brass-line: rgba(212, 181, 122, 0.32);
  --paper: #ece6d6;
  --draft: #1c1e22;
  --teal: #7eccc6;
  --danger: #d46a48;
  --hair: rgba(255, 255, 255, 0.07);
  --field: #0c0e12;
  --btn-fg: #14120e;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.28);
  --radius: 14px;
  --theme-color: #090a0c;
}
[data-theme="light"] {
  --void: #f4f0e7;
  --chrome: #fffdf8;
  --ink: #1b1d21;
  --muted: #5a564e;
  --faint: #8a8476;
  --brass: #8a6b38;
  --brass-line: rgba(138, 107, 56, 0.34);
  --paper: #fffdf8;
  --draft: #1c1e22;
  --teal: #1c6d6a;
  --danger: #b33a1c;
  --hair: rgba(28, 30, 34, 0.08);
  --field: #f7f4ec;
  --btn-fg: #fffdf8;
  --shadow: 0 10px 32px rgba(28, 30, 34, 0.08);
  --theme-color: #f4f0e7;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body {
  margin: 0;
  min-height: 100%;
  background: var(--void);
  color: var(--ink);
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  font-size: 15px;
  line-height: 1.5;
}
body {
  background-image:
    linear-gradient(rgba(127, 127, 127, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(127, 127, 127, 0.035) 1px, transparent 1px);
  background-size: 28px 28px;
}
a { color: var(--brass); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
.skip {
  position: absolute;
  left: 16px;
  top: -48px;
  z-index: 20;
  background: var(--brass);
  color: var(--btn-fg);
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.skip:focus { top: 12px; }
:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 2px;
}
input:focus-visible, select:focus-visible, textarea:focus-visible, button:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 1px;
}
.app { max-width: 1280px; margin: 0 auto; padding: 20px 24px 72px; }
.mast {
  display: grid;
  gap: 16px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--brass-line);
  margin-bottom: 28px;
}
.mast-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
}
.brand { display: flex; gap: 12px; align-items: center; color: inherit; text-decoration: none; }
.brand:hover { text-decoration: none; }
.mast-mark {
  width: 36px; height: 36px;
  border: 1px solid var(--brass);
  border-radius: 50%;
  position: relative; flex: none;
}
.mast-mark::before {
  content: "";
  position: absolute;
  inset: 12px;
  background: var(--brass);
  border-radius: 50%;
}
h1 { margin: 0; font-size: 22px; letter-spacing: 0.32em; font-weight: 600; }
h2 { margin: 0 0 10px; font-size: 22px; font-weight: 500; letter-spacing: -0.02em; }
.page-head { margin-bottom: 22px; max-width: 70ch; }
.page-head h2 { margin-bottom: 8px; }
.lead, .page-head p, p.lead { color: var(--muted); margin: 0 0 8px; max-width: 72ch; }
.eyebrow {
  margin: 0 0 6px;
  color: var(--brass);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 28px;
  align-items: flex-start;
}
.nav-cluster {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
  align-items: center;
}
.nav-label {
  color: var(--faint);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin-right: 4px;
}
.nav a {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
}
.nav a:hover { color: var(--brass); text-decoration: none; }
.nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--brass);
}
.mast-tools { display: flex; gap: 8px; align-items: center; }
.panel {
  background: var(--chrome);
  border: 1px solid var(--hair);
  padding: 20px;
  margin-bottom: 16px;
  border-radius: var(--radius);
}
.grid-2 { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr); gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.field { margin-bottom: 12px; }
.field label { display: flex; justify-content: space-between; gap: 12px; font-size: 13px; margin-bottom: 5px; }
.field label span { color: var(--faint); font-size: 11px; letter-spacing: 0.04em; }
.field-control {
  display: grid;
  grid-template-columns: 1fr auto;
  border: 1px solid var(--brass-line);
  background: var(--field);
  border-radius: 8px;
  overflow: hidden;
}
.field-control input, .field-control select {
  border: 0;
  background: transparent;
  color: var(--ink);
  padding: 9px 12px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 14.5px;
  width: 100%;
}
textarea {
  width: 100%;
  min-height: 8rem;
  border: 1px solid var(--brass-line);
  background: var(--field);
  color: var(--ink);
  font-family: "IBM Plex Mono", monospace;
  padding: 10px 12px;
  border-radius: 8px;
  resize: vertical;
}
.field-control .unit {
  display: flex;
  align-items: center;
  padding: 0 10px;
  color: var(--brass);
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.04em;
  border-left: 1px solid var(--brass-line);
  white-space: nowrap;
}
.btn, .btn-ghost {
  background: var(--brass);
  color: var(--btn-fg);
  border: 1px solid var(--brass);
  padding: 9px 14px;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  border-radius: 8px;
  font-family: inherit;
}
.btn:hover { filter: brightness(1.06); }
.btn-ghost {
  background: transparent;
  color: var(--muted);
  border-color: var(--hair);
}
.btn-ghost:hover { color: var(--brass); border-color: var(--brass); }
.heroes { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 14px; }
.hero {
  background: var(--field);
  border: 1px solid var(--brass-line);
  padding: 14px 14px 12px;
  border-radius: 10px;
}
.hero-k { color: var(--brass); font-family: "IBM Plex Mono", monospace; font-size: 12px; letter-spacing: 0.04em; }
.hero-v {
  display: block;
  font-family: "IBM Plex Mono", monospace;
  font-size: 26px;
  margin: 8px 0 4px;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}
.hero-u { color: var(--faint); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; }
.table-wrap { overflow-x: auto; margin: 8px 0 12px; }
table { width: 100%; border-collapse: collapse; font-size: 12.5px; }
th {
  text-align: left;
  color: var(--faint);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0 10px 8px 0;
  font-weight: 500;
}
td {
  padding: 8px 10px 8px 0;
  border-bottom: 1px solid var(--hair);
  font-variant-numeric: tabular-nums;
  font-family: "IBM Plex Mono", monospace;
  font-size: 12.5px;
}
td:first-child { font-family: "IBM Plex Sans", sans-serif; color: var(--muted); }
.auth { max-width: 440px; margin: 48px auto; padding: 28px 28px 24px; }
.auth h2 { margin-bottom: 8px; }
.auth .btn { width: 100%; margin-top: 6px; }
.auth p { color: var(--muted); }
.err { color: var(--danger); font-size: 13px; }
.ok { color: var(--teal); }
.prose { max-width: 78ch; }
.prose h2, .doc-body h2 { margin-top: 28px; font-size: 18px; }
.prose h3, .doc-body h3 { margin-top: 22px; font-size: 16px; }
.prose p, .prose li, .doc-body p, .doc-body li { color: var(--muted); }
.prose strong, .doc-body strong { color: var(--ink); font-weight: 600; }
.prose code, .doc-body code {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.92em;
  color: var(--ink);
  background: var(--field);
  padding: 1px 5px;
  border-radius: 4px;
}
.prose pre, .proof, .doc-body pre {
  font-family: "IBM Plex Mono", monospace;
  font-size: 12.5px;
  white-space: pre-wrap;
  color: var(--ink);
  line-height: 1.65;
  background: var(--field);
  border: 1px solid var(--hair);
  padding: 14px 16px;
  border-radius: 10px;
  overflow-x: auto;
}
.doc-body pre code { background: none; padding: 0; }
.doc-body ul, .doc-body ol { padding-left: 1.2em; }
.doc-body table { margin: 12px 0 18px; }
.sheet {
  background: var(--paper);
  color: var(--draft);
  padding: 16px 12px 8px;
  border-radius: 12px;
  border: 1px solid var(--hair);
  overflow: hidden;
  margin-bottom: 16px;
}
.sheet svg, #diagram, #fbd {
  width: 100%;
  height: auto;
  display: block;
  min-height: 240px;
}
#diagram, #fbd { min-height: 320px; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 4px; }
.axis-card {
  border: 1px solid var(--hair);
  padding: 12px;
  margin-bottom: 10px;
  border-radius: 10px;
  background: var(--field);
}
canvas {
  width: 100%;
  height: auto;
  background: var(--field);
  border: 1px solid var(--hair);
  display: block;
  margin-bottom: 10px;
  border-radius: 10px;
}
.warn { color: var(--danger); font-size: 13px; min-height: 1.2em; }
.foot {
  margin-top: 36px;
  padding-top: 14px;
  border-top: 1px solid var(--hair);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  color: var(--faint);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.home-group { margin-bottom: 32px; }
.home-group > .page-head { margin-bottom: 16px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 14px; }
.card {
  display: block;
  padding: 18px 18px 16px;
  border: 1px solid var(--hair);
  background: var(--chrome);
  color: inherit;
  min-height: 148px;
  border-radius: var(--radius);
  text-decoration: none;
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
.card:hover {
  border-color: var(--brass);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.card h2 { font-size: 17px; margin: 4px 0 8px; }
.card p { margin: 0; color: var(--muted); font-size: 13.5px; }
.muted { color: var(--muted); }
details.adv {
  border-top: 1px solid var(--hair);
  margin: 16px 0 8px;
  padding-top: 10px;
}
details.adv > summary {
  cursor: pointer;
  color: var(--brass);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 12px;
  margin-bottom: 10px;
}
.invite-path {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  margin: 8px 0 0;
}
.invite-path input {
  flex: 1;
  min-width: 220px;
  font-family: "IBM Plex Mono", monospace;
  background: var(--field);
  color: var(--ink);
  border: 1px solid var(--brass-line);
  border-radius: 8px;
  padding: 8px 10px;
}
.also { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; }
@media (max-width: 960px) {
  .grid-2, .grid-3, .cards, .heroes { grid-template-columns: 1fr; }
  .app { padding: 16px 14px 56px; }
  .auth { margin: 24px auto; }
}