:root {
  --paper: #fbfaf7; --grid: rgba(96,130,170,0.14);
  --panel: #ffffff; --ink: #1c3a66; --muted: #4a5a70; --pencil: #6b7482;
  --accent: #a83c3c; --accent-ink: #fff; --edge: rgba(28,58,102,0.14);
  --chip: rgba(28,58,102,0.06); --ok: #2f6b52; --err: #a83c3c;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #14181f; --grid: rgba(130,160,200,0.08);
    --panel: #1a2029; --ink: #c4d4ec; --muted: #93a3b8; --pencil: #7e8a99;
    --accent: #d98a7a; --accent-ink: #14181f; --edge: rgba(196,212,236,0.14);
    --chip: rgba(196,212,236,0.07); --ok: #8fd7b4; --err: #d98a7a;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background-color: var(--paper);
  background-image: linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
  color: var(--ink); line-height: 1.55;
  font-family: -apple-system, system-ui, "Segoe UI", Roboto, sans-serif;
  -webkit-text-size-adjust: 100%;
}
.mono, code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

.topbar {
  position: sticky; top: 0; z-index: 10;
  background: var(--panel); border-bottom: 2px solid var(--accent);
  padding: 10px 16px calc(10px + env(safe-area-inset-bottom, 0));
}
.brand { font-weight: 800; letter-spacing: -0.01em; font-size: 1.15rem; }
nav { display: flex; gap: 4px; margin-top: 8px; flex-wrap: wrap; }
nav a {
  text-decoration: none; color: var(--muted); font-size: 0.86rem;
  padding: 5px 11px; border-radius: 999px; border: 1px solid transparent;
}
nav a.active { color: var(--accent); border-color: var(--accent); background: var(--chip); }

.wrap { max-width: 640px; margin: 0 auto; padding: 16px 16px 40px; display: grid; gap: 14px; }
.card {
  background: var(--panel); border: 1px solid var(--edge); border-radius: 10px;
  padding: 16px; display: grid; gap: 10px;
}
h2 { margin: 0; font-size: 1.3rem; letter-spacing: -0.01em; }
h3 { margin: 0; font-size: 1.05rem; }
p { margin: 0; }
.muted { color: var(--muted); }
.small { font-size: 0.85rem; }
.hint { text-align: center; color: var(--muted); font-size: 0.9rem; }
a { color: var(--accent); }

.bigbtns { display: grid; gap: 10px; margin-top: 6px; }
.bigbtn {
  display: block; text-align: center; text-decoration: none;
  background: var(--accent); color: var(--accent-ink); font-weight: 700;
  padding: 18px; border-radius: 10px; font-size: 1.05rem;
}
.bigbtn:last-child { background: var(--chip); color: var(--ink); border: 1px solid var(--edge); }

.form { display: grid; gap: 12px; }
.fld { display: grid; gap: 4px; }
.fld .lbl { font-size: 0.82rem; color: var(--muted); }
input, select, button {
  font: inherit; padding: 11px 12px; border-radius: 8px;
  border: 1px solid var(--edge); background: var(--paper); color: var(--ink);
}
input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
button { cursor: pointer; background: var(--chip); font-weight: 600; }
button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
button.danger { color: var(--err); border-color: var(--err); background: transparent; }
button.small { padding: 6px 10px; font-size: 0.82rem; }

.instr { margin: 0; padding-left: 22px; display: grid; gap: 5px; }
.instr li { color: var(--ink); }
.ok { color: var(--ok); font-weight: 600; }
.err { color: var(--err); font-weight: 600; }
.box { border: 1px solid var(--err); border-radius: 8px; padding: 10px 12px; }

table.kv { border-collapse: collapse; width: 100%; }
table.kv th { text-align: left; color: var(--muted); font-weight: 600; padding: 5px 10px 5px 0; white-space: nowrap; vertical-align: top; }
table.kv td { padding: 5px 0; }

.row { display: flex; align-items: center; gap: 10px; justify-content: space-between; flex-wrap: wrap; }
.keyhex { display: block; word-break: break-all; background: var(--chip); padding: 8px 10px; border-radius: 6px; font-size: 0.8rem; }
.chgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 6px; }
.chitem { display: flex; align-items: center; gap: 8px; font-size: 0.88rem; }
.chitem input { width: auto; padding: 0; }
input[type=range] { padding: 0; accent-color: var(--accent); flex: 1; }

.toggle { display: flex; gap: 4px; margin-top: 8px; }
.toggle-opt { flex: 1; padding: 9px; border-radius: 8px; border: 1px solid var(--edge); background: var(--chip); color: var(--muted); font-weight: 600; }
.toggle-opt.active { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.tokens { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; min-height: 22px; }
.token { background: var(--chip); border: 1px solid var(--accent); color: var(--ink); border-radius: 999px; padding: 4px 11px; font-size: 0.85rem; cursor: pointer; }
.vocabres { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0; max-height: 170px; overflow-y: auto; }
.vocabbtn { padding: 5px 11px; font-size: 0.82rem; border-radius: 999px; background: var(--chip); border: 1px solid var(--edge); color: var(--ink); }

.foot { text-align: center; color: var(--pencil); font-size: 0.78rem; padding: 20px; }