:root {
  --paper: #F3F6F0; --card: #FFFFFF; --ink: #13241B; --ink-soft: #4A5A50;
  --line: #DDE5DA; --brand: #163A2A; --brand-2: #2E6B4F; --lime: #C8E6A0;
  --lime-deep: #A9D178; --red: #E14328; --red-soft: #FBE7E2; --good: #2E8B57;
  --shadow: 0 1px 2px rgba(19,36,27,.06), 0 6px 20px rgba(19,36,27,.06);
  --mono: ui-monospace, "JetBrains Mono", "SF Mono", Menlo, monospace;
  --sans: "Archivo", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0E1A14; --card: #16241C; --ink: #E9F1E6; --ink-soft: #9DB0A2;
    --line: #26382D; --brand: #0A1610; --brand-2: #4E9B76; --red: #F1785F;
    --red-soft: #3A211C; --good: #6FCB95;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
  }
}
:root[data-theme="light"] {
  --paper: #F3F6F0; --card: #FFFFFF; --ink: #13241B; --ink-soft: #4A5A50;
  --line: #DDE5DA; --brand: #163A2A; --brand-2: #2E6B4F; --red: #E14328;
  --red-soft: #FBE7E2; --good: #2E8B57;
  --shadow: 0 1px 2px rgba(19,36,27,.06), 0 6px 20px rgba(19,36,27,.06);
}
:root[data-theme="dark"] {
  --paper: #0E1A14; --card: #16241C; --ink: #E9F1E6; --ink-soft: #9DB0A2;
  --line: #26382D; --brand: #0A1610; --brand-2: #4E9B76; --red: #F1785F;
  --red-soft: #3A211C; --good: #6FCB95;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans);
  line-height: 1.5; -webkit-font-smoothing: antialiased; }
.wrap { max-width: 640px; margin: 0 auto; padding: 0 16px 64px; }

.bar { background: var(--brand); color: #EAF3E2; }
.bar-in { max-width: 640px; margin: 0 auto; padding: 14px 16px; display: flex;
  align-items: center; gap: 12px; }
.logo { width: 30px; height: 30px; border-radius: 8px; background: var(--lime);
  color: var(--brand); display: grid; place-items: center; font-weight: 800;
  font-size: 15px; letter-spacing: -.5px; flex: none; }
.bar b { font-weight: 800; letter-spacing: -.3px; }
.bar small { color: #9FBBA6; font-size: 12px; display: block; margin-top: -2px; }
.bar .sp { flex: 1; }
.who { font-size: 13px; color: #C9DBC7; }
.icon-btn { background: rgba(255,255,255,.08); color: #EAF3E2; border: 0;
  min-width: 34px; height: 34px; padding: 0 10px; border-radius: 8px; cursor: pointer;
  font-size: 13px; font-weight: 600; }
.icon-btn:hover { background: rgba(255,255,255,.16); }
.accent { height: 6px; background: linear-gradient(90deg, var(--lime-deep), var(--brand-2)); }

h1 { font-size: 26px; font-weight: 800; letter-spacing: -.6px; margin: 28px 0 4px;
  text-wrap: balance; }
.sub { color: var(--ink-soft); margin: 0 0 20px; font-size: 15px; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  box-shadow: var(--shadow); padding: 22px; margin-bottom: 16px; }
.card.head { border-top: 6px solid var(--brand-2); }

label.field { display: block; font-size: 13px; font-weight: 700; margin: 0 0 6px;
  letter-spacing: .2px; }
input[type=text], input[type=password] { width: 100%; padding: 11px 13px;
  border: 1px solid var(--line); border-radius: 9px; font: inherit; font-size: 15px;
  background: var(--paper); color: var(--ink); }
input:focus-visible, button:focus-visible, .opt:focus-visible { outline: 2px solid var(--brand-2);
  outline-offset: 2px; }
.stack { display: flex; flex-direction: column; gap: 16px; }

.btn { font: inherit; font-weight: 700; font-size: 15px; border: 0; border-radius: 10px;
  padding: 12px 22px; cursor: pointer; background: var(--brand-2); color: #fff;
  display: inline-flex; align-items: center; gap: 8px; }
.btn:hover { filter: brightness(1.06); }
.btn.ghost { background: transparent; color: var(--brand-2); border: 1px solid var(--line); }
.btn.ghost:hover { border-color: var(--brand-2); filter: none; }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.row.end { justify-content: space-between; }

.err { color: var(--red); font-size: 13.5px; font-weight: 600; min-height: 18px; }

.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip { border: 1px solid var(--line); background: var(--card); border-radius: 999px;
  padding: 9px 15px; font-size: 14px; font-weight: 600; cursor: pointer; color: var(--ink);
  display: inline-flex; align-items: center; gap: 8px; }
.chip .n { font-family: var(--mono); font-size: 12px; color: var(--ink-soft); }
.chip[aria-pressed=true] { background: var(--lime); border-color: var(--lime-deep); color: var(--brand); }
.chip[aria-pressed=true] .n { color: var(--brand); }

.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.seg button { border: 0; background: var(--card); color: var(--ink); font: inherit;
  font-weight: 600; font-size: 14px; padding: 8px 16px; cursor: pointer; }
.seg button[aria-pressed=true] { background: var(--brand-2); color: #fff; }

.prog { position: sticky; top: 0; z-index: 5; background: var(--paper); padding: 12px 0 10px; }
.prog .track { height: 8px; border-radius: 99px; background: var(--line); overflow: hidden; }
.prog .fill { height: 100%; background: var(--brand-2); border-radius: 99px; transition: width .3s ease; }
.prog .meta { display: flex; justify-content: space-between; font-size: 12px;
  color: var(--ink-soft); margin-bottom: 6px; font-family: var(--mono); }

.qtag { font-size: 11px; font-weight: 800; letter-spacing: .8px; text-transform: uppercase; color: var(--brand-2); }
.qtag .req { color: var(--red); }
.qprompt { font-size: 17px; font-weight: 700; margin: 6px 0 16px; line-height: 1.4; text-wrap: balance; }

.opts { display: flex; flex-direction: column; gap: 10px; }
.opt { display: flex; align-items: center; gap: 12px; border: 1px solid var(--line);
  border-radius: 10px; padding: 12px 14px; cursor: pointer; background: var(--card);
  font-size: 15px; transition: border-color .12s, background .12s; }
.opt:hover { border-color: var(--brand-2); }
.opt .dot { width: 20px; height: 20px; border-radius: 50%; border: 2px solid var(--line);
  flex: none; display: grid; place-items: center; }
.opt[aria-checked=true] { border-color: var(--brand-2); background: color-mix(in srgb, var(--brand-2) 8%, var(--card)); }
.opt[aria-checked=true] .dot { border-color: var(--brand-2); }
.opt[aria-checked=true] .dot::after { content: ""; width: 10px; height: 10px; border-radius: 50%; background: var(--brand-2); }
.opt.correct { border-color: var(--good); background: color-mix(in srgb, var(--good) 12%, var(--card)); }
.opt.wrong { border-color: var(--red); background: var(--red-soft); }
.opt .mk { margin-left: auto; font-weight: 800; font-size: 13px; }
.opt.correct .mk { color: var(--good); }
.opt.wrong .mk { color: var(--red); }

.short input { margin-top: 4px; }
.explain { margin-top: 12px; font-size: 13.5px; color: var(--ink-soft);
  border-left: 3px solid var(--lime-deep); padding: 4px 0 4px 12px; }
.explain b { color: var(--ink); }

.score-wrap { display: flex; align-items: center; gap: 22px; flex-wrap: wrap; }
.ring { --p: 0; width: 118px; height: 118px; border-radius: 50%; flex: none;
  background: conic-gradient(var(--brand-2) calc(var(--p) * 1%), var(--line) 0);
  display: grid; place-items: center; }
.ring .inner { width: 88px; height: 88px; border-radius: 50%; background: var(--card);
  display: grid; place-items: center; text-align: center; }
.ring .pct { font-family: var(--mono); font-size: 26px; font-weight: 700; letter-spacing: -1px; }
.ring .lbl { font-size: 11px; color: var(--ink-soft); }
.score-txt h2 { margin: 0 0 4px; font-size: 20px; letter-spacing: -.4px; }
.score-txt p { margin: 0; color: var(--ink-soft); font-size: 14px; }

.stat { margin-bottom: 14px; }
.stat .top { display: flex; justify-content: space-between; font-size: 13.5px; margin-bottom: 5px; }
.stat .top b { font-weight: 700; }
.stat .top span { font-family: var(--mono); color: var(--ink-soft); }
.stat .track { height: 9px; border-radius: 99px; background: var(--line); overflow: hidden; }
.stat .fill { height: 100%; border-radius: 99px; }

.hist { display: flex; flex-direction: column; }
.hist-row { display: flex; align-items: center; gap: 12px; padding: 12px 0;
  border-bottom: 1px solid var(--line); font-size: 14px; }
.hist-row:last-child { border-bottom: 0; }
.hist-row .cat { font-weight: 700; }
.hist-row .date { color: var(--ink-soft); font-size: 12px; font-family: var(--mono); }
.pill { margin-left: auto; font-family: var(--mono); font-weight: 700; font-size: 13px;
  padding: 3px 10px; border-radius: 999px; }
.pill.hi { background: color-mix(in srgb, var(--good) 16%, transparent); color: var(--good); }
.pill.mid { background: color-mix(in srgb, var(--lime-deep) 22%, transparent); color: var(--brand-2); }
.pill.lo { background: var(--red-soft); color: var(--red); }

.tabs { display: flex; gap: 6px; margin: 20px 0 16px; }
.tabs button { flex: 1; border: 0; background: transparent; color: var(--ink-soft);
  font: inherit; font-weight: 700; font-size: 14px; padding: 9px; border-radius: 9px; cursor: pointer; }
.tabs button[aria-selected=true] { background: var(--card); color: var(--ink); box-shadow: var(--shadow); }

.muted { color: var(--ink-soft); font-size: 14px; }
.hidden { display: none !important; }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }