:root{
  --paper:#f2f5fa; --ink:#14213d; --muted:#5b6784; --line:#d9e0ee;
  --card:#ffffff; --hl:#ffd23f; --ok:#1f9d6b; --err:#c8382f;
  color-scheme: light;
}
@media (prefers-color-scheme: dark){
  :root{--paper:#0f1626; --ink:#eef2fb; --muted:#9aa7c4; --line:#27324d; --card:#18213a; color-scheme: dark;}
}
*{box-sizing:border-box}
html,body{margin:0}
body{
  font-family:'Be Vietnam Pro',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  background:var(--paper); color:var(--ink); line-height:1.55;
  padding:env(safe-area-inset-top) 0 env(safe-area-inset-bottom);
}
.wrap{max-width:520px;margin:0 auto;padding:20px 18px 40px}
.wrap.wide{max-width:1180px}
h1{font-size:1.65rem;line-height:1.25;margin:.2em 0 .3em;font-weight:700}
h2{font-size:1.15rem;margin:0 0 .6em}
p.lead{color:var(--muted);margin:0 0 1.2em}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:48px;padding:0 22px;border:0;border-radius:12px;cursor:pointer;
  background:var(--ink);color:var(--paper);font:600 1rem inherit;font-family:inherit;text-decoration:none;
}
.btn.hl{background:var(--hl);color:#14213d}
.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}
.btn.danger{background:var(--err);color:#fff;min-height:36px;padding:0 14px;font-size:.9rem}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn:focus-visible,input:focus-visible{outline:3px solid var(--hl);outline-offset:2px}
.btn.block{width:100%}
label{display:block;font-weight:600;margin:14px 0 6px}
input[type=text],input[type=date],input[type=password]{
  width:100%;min-height:50px;padding:0 14px;border-radius:12px;border:1px solid var(--line);
  background:var(--paper);color:var(--ink);font:1rem inherit;font-family:inherit;
}
.err{color:var(--err);font-weight:600;margin:10px 0 0;min-height:1.4em}
.hidden{display:none!important}

/* Camera */
.stage{position:relative;aspect-ratio:3/4;border-radius:20px;overflow:hidden;background:#000}
.stage video,.stage canvas{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.stage video{transform:scaleX(-1)}
.oval{
  position:absolute;left:50%;top:48%;width:68%;aspect-ratio:3/4;transform:translate(-50%,-50%);
  border:4px solid rgba(255,255,255,.85);border-radius:50%;
  box-shadow:0 0 0 999px rgba(10,16,30,.45);transition:border-color .2s;
}
.oval.found{border-color:var(--hl)}
.oval.done{border-color:var(--ok)}
.status{
  position:absolute;left:12px;right:12px;bottom:12px;padding:10px 14px;border-radius:12px;
  background:rgba(10,16,30,.72);color:#fff;font-weight:600;text-align:center;font-size:.95rem;
}
.preview{display:block;width:150px;aspect-ratio:3/4;object-fit:cover;border-radius:14px;margin:0 auto 6px;border:3px solid var(--ok)}

/* Kết quả */
.tick{width:84px;height:84px;border-radius:50%;background:var(--ok);display:grid;place-items:center;margin:8px auto 10px}
.points{font-size:3.2rem;font-weight:800;line-height:1;margin:.1em 0}
.hlmark{background:linear-gradient(transparent 55%,var(--hl) 55%);padding:0 4px}
.stats{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:16px 0}
.stat{border:1px solid var(--line);border-radius:14px;padding:12px;text-align:center;background:var(--card)}
.stat b{display:block;font-size:1.7rem}
.stat span{color:var(--muted);font-size:.9rem}
table{width:100%;border-collapse:collapse}
th,td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line);vertical-align:middle}
th{font-size:.9rem;color:var(--muted);font-weight:600;white-space:nowrap}
tr.me td{background:rgba(255,210,63,.25);font-weight:700}
.center{text-align:center}
.tablebox{overflow-x:auto}
.thumb{width:56px;height:74px;object-fit:cover;border-radius:8px;display:block}
.bar{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:16px}
.notice{padding:10px 14px;border-radius:12px;background:rgba(255,210,63,.25);margin:0 0 14px;font-weight:600}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}