* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, 'Segoe UI', Roboto, sans-serif; background: #0f1420; color: #e8eaf0; min-height: 100vh; }
header { display: flex; justify-content: space-between; align-items: center; padding: 14px 20px; border-bottom: 1px solid #232a3a; position: sticky; top: 0; background: #0f1420; z-index: 10; }
header h1 { font-size: 1.05rem; font-weight: 600; color: #6ea8fe; cursor: pointer; }
#hdr-info { font-size: .8rem; color: #8b93a5; }
main { max-width: 760px; margin: 0 auto; padding: 20px 16px 60px; }

.bank-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 18px 0; }
.bank-card { background: #171e30; border: 1px solid #232a3a; border-radius: 12px; padding: 18px; cursor: pointer; transition: .15s; }
.bank-card:hover { border-color: #6ea8fe; transform: translateY(-2px); }
.bank-card h3 { font-size: .95rem; margin-bottom: 6px; }
.bank-card p { font-size: .78rem; color: #8b93a5; }
.bank-card .cnt { color: #6ea8fe; font-weight: 600; }

.mode-row { display: flex; gap: 10px; flex-wrap: wrap; margin: 14px 0; }
button { font-family: inherit; }
.btn { background: #6ea8fe; color: #0f1420; border: none; padding: 10px 18px; border-radius: 8px; font-weight: 600; font-size: .88rem; cursor: pointer; }
.btn:hover { background: #8cbaff; }
.btn.ghost { background: #171e30; color: #e8eaf0; border: 1px solid #2c3650; }
.btn.ghost:hover { border-color: #6ea8fe; }
.btn.sm { padding: 6px 12px; font-size: .8rem; }

.topbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; flex-wrap: wrap; gap: 8px; }
.progress { height: 6px; background: #232a3a; border-radius: 3px; margin: 12px 0 18px; overflow: hidden; }
.progress > div { height: 100%; background: #6ea8fe; transition: width .2s; }
.timer { font-variant-numeric: tabular-nums; color: #ffd166; font-weight: 600; }

.qcard { background: #171e30; border: 1px solid #232a3a; border-radius: 14px; padding: 22px; }
.qnum { font-size: .78rem; color: #8b93a5; margin-bottom: 10px; }
.qtext { font-size: 1.02rem; line-height: 1.55; margin-bottom: 18px; font-weight: 500; }
.opt { display: block; width: 100%; text-align: left; background: #11182a; border: 1px solid #2c3650; color: #e8eaf0; border-radius: 10px; padding: 13px 15px; margin-bottom: 10px; font-size: .92rem; line-height: 1.45; cursor: pointer; transition: .12s; }
.opt:hover { border-color: #6ea8fe; }
.opt .let { display: inline-block; min-width: 24px; font-weight: 700; color: #6ea8fe; }
.opt.correct { border-color: #3dd68c; background: #12291e; }
.opt.correct .let { color: #3dd68c; }
.opt.wrong { border-color: #f06a6a; background: #2b1518; }
.opt.wrong .let { color: #f06a6a; }
.opt.dim { opacity: .55; }
.opt:disabled { cursor: default; }

.ans-reveal { margin-top: 14px; padding: 12px 15px; border-radius: 10px; background: #12291e; border: 1px solid #2a5c42; color: #3dd68c; font-weight: 600; font-size: .92rem; }

.nav-row { display: flex; justify-content: space-between; gap: 10px; margin-top: 18px; }
.nav-row .mid { color: #8b93a5; font-size: .85rem; align-self: center; }

.result { text-align: center; padding: 40px 20px; }
.result .score { font-size: 3rem; font-weight: 700; color: #6ea8fe; }
.result .score.pass { color: #3dd68c; }
.result .score.fail { color: #f06a6a; }
.result p { color: #8b93a5; margin: 8px 0 20px; }

.rev-item { background: #171e30; border: 1px solid #232a3a; border-radius: 10px; padding: 15px; margin-bottom: 10px; font-size: .88rem; }
.rev-item .q { font-weight: 600; margin-bottom: 8px; line-height: 1.4; }
.rev-item .you { color: #f06a6a; }
.rev-item .right { color: #3dd68c; }

.check { display: flex; align-items: center; gap: 8px; font-size: .85rem; color: #8b93a5; cursor: pointer; user-select: none; }
.check input { accent-color: #6ea8fe; }

.tag { font-size: .72rem; background: #232a3a; padding: 3px 9px; border-radius: 20px; color: #8b93a5; }
.stats { font-size: .8rem; color: #8b93a5; margin-top: 8px; }

footer { max-width: 760px; margin: 0 auto; padding: 0 16px 28px; text-align: center; font-size: .75rem; color: #566072; }
footer a { color: #6ea8fe; text-decoration: none; }
footer a:hover { text-decoration: underline; }

@media (max-width: 560px) {
  .bank-grid { grid-template-columns: 1fr; }
  .qcard { padding: 16px; }
}