:root {
  --bg: #0f1420; --card: #1a2233; --ink: #eef2fa; --muted: #9aa6bd;
  --accent: #4f9cf9; --good: #3ecf8e; --bad: #ff6b6b; --line: #2a3550;
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-text-size-adjust: 100%;
}
.topbar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 0.75rem 1rem; border-bottom: 1px solid var(--line);
  position: sticky; top: 0; background: var(--bg); z-index: 10;
}
.brand { font-weight: 700; font-size: 1.05rem; }
.tag { font-weight: 400; color: var(--muted); font-size: 0.8rem; }
.navbtn {
  background: none; border: 1px solid var(--line); color: var(--ink);
  padding: 0.45rem 0.9rem; border-radius: 999px; margin-left: 0.4rem;
  font-size: 0.9rem; cursor: pointer;
}
.navbtn.active { background: var(--accent); border-color: var(--accent); color: #06121f; font-weight: 600; }
main { max-width: 640px; margin: 0 auto; padding: 1rem; }
.view.hidden, .hidden { display: none !important; }
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 14px; padding: 1.1rem; margin-bottom: 1rem;
}
.hero { display: flex; gap: 1.1rem; align-items: center; }
.readiness-ring {
  width: 96px; height: 96px; border-radius: 50%;
  border: 8px solid var(--accent); display: flex;
  align-items: center; justify-content: center;
  font-size: 1.4rem; font-weight: 700; flex-shrink: 0;
}
.muted { color: var(--muted); }
.row { display: flex; gap: 0.6rem; flex-wrap: wrap; margin-top: 0.8rem; }
.btn {
  background: var(--line); color: var(--ink); border: none;
  padding: 0.7rem 1.1rem; border-radius: 10px; font-size: 0.95rem; cursor: pointer;
}
.btn.primary { background: var(--accent); color: #06121f; font-weight: 700; }
.btn:disabled { opacity: 0.5; cursor: default; }
label { display: block; margin: 0.7rem 0; font-size: 0.9rem; color: var(--muted); }
select {
  display: block; width: 100%; margin-top: 0.3rem; padding: 0.65rem;
  border-radius: 10px; border: 1px solid var(--line);
  background: var(--bg); color: var(--ink); font-size: 1rem;
}
.topic-row { padding: 0.55rem 0; border-bottom: 1px solid var(--line); }
.topic-row:last-child { border-bottom: none; }
.topic-head { display: flex; justify-content: space-between; font-size: 0.92rem; }
.bar { height: 8px; background: var(--bg); border-radius: 99px; margin-top: 0.35rem; overflow: hidden; }
.bar > div { height: 100%; background: var(--accent); border-radius: 99px; }
.bar > div.low { background: var(--bad); }
.bar > div.mid { background: #f5b942; }
.quiz-meta { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.5rem; }
.pill { background: var(--line); border-radius: 999px; padding: 0.25rem 0.7rem; font-size: 0.8rem; color: var(--muted); }
.stem { font-size: 1.08rem; line-height: 1.5; }
.options { display: grid; gap: 0.6rem; margin-top: 0.8rem; }
.opt {
  background: var(--bg); border: 1px solid var(--line); color: var(--ink);
  text-align: left; padding: 0.8rem; border-radius: 10px; font-size: 0.98rem; cursor: pointer;
}
.opt:hover:not(:disabled) { border-color: var(--accent); }
.opt.picked-correct { border-color: var(--good); background: #123527; }
.opt.picked-wrong { border-color: var(--bad); background: #3a1c1c; }
.opt.reveal-correct { border-color: var(--good); }
.opt:disabled { cursor: default; opacity: 0.95; }
.feedback { margin-top: 0.9rem; padding: 0.8rem; border-radius: 10px; font-size: 0.95rem; line-height: 1.5; }
.feedback.good { background: #123527; border: 1px solid var(--good); }
.feedback.bad { background: #3a1c1c; border: 1px solid var(--bad); }
.big { font-size: 2rem; font-weight: 700; margin: 0.3rem 0; }
.foot { text-align: center; padding: 1.5rem 1rem 2rem; font-size: 0.8rem; }
h2 { margin: 0 0 0.4rem; font-size: 1.2rem; }
h3 { margin: 1.2rem 0 0.6rem; font-size: 1rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; }

/* Phase 2: auth / exam / pricing */
.card.narrow { max-width: 460px; margin: 0 auto 1rem; }
input[type="email"], input[type="password"], input[type="text"] {
  display: block; width: 100%; margin-top: 0.3rem; padding: 0.65rem;
  border-radius: 10px; border: 1px solid var(--line);
  background: var(--bg); color: var(--ink); font-size: 1rem;
}
a { color: var(--accent); }
.small { font-size: 0.82rem; }
.good { color: var(--good); }
.bad { color: var(--bad); }
.user-chip {
  font-size: 0.82rem; color: var(--muted); margin-left: 0.6rem;
  max-width: 220px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.exam-topbar {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 0.6rem; gap: 0.5rem; flex-wrap: wrap;
}
.clock {
  font-size: 1.3rem; font-weight: 700; font-variant-numeric: tabular-nums;
  background: var(--bg); border: 1px solid var(--line);
  padding: 0.25rem 0.8rem; border-radius: 10px;
}
.clock.urgent { color: var(--bad); border-color: var(--bad); }
.opt.picked { border-color: var(--accent); background: #14294a; }
#btn-exam-flag.flagged { border: 1px solid var(--bad); color: var(--bad); }
.exam-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(44px, 1fr));
  gap: 0.45rem; margin: 1rem 0;
}
.cell {
  aspect-ratio: 1; border-radius: 8px; border: 1px solid var(--line);
  background: var(--bg); color: var(--ink); font-size: 0.85rem; cursor: pointer;
}
.cell.done { background: #123527; border-color: var(--good); }
.cell.todo { border-style: dashed; }
.cell.flag { box-shadow: inset 0 -4px 0 var(--bad); }
.review-item.good { border-left: 4px solid var(--good); }
.review-item.bad { border-left: 4px solid var(--bad); }
.review-item .stem { margin-top: 0; }
ul { padding-left: 1.2rem; }
li { margin: 0.35rem 0; }