:root {
  --maroon: #7c3848; --navy: #303680; --saffron: #f58320; --teal: #1f8a84; --red: #e91d28;
  --ink: #1e1e1e; --body: #3a3a3a; --dim: #6b6b6b; --mute: #9a9a9a; --line: #d9d9d9; --tint: #f5f4f4;
  --bg: #ffffff;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink); font-family: Arial, Helvetica, sans-serif; -webkit-text-size-adjust: 100%; }
button { font: inherit; }
.kicker { font-size: 12px; font-weight: 700; letter-spacing: .18em; color: var(--maroon); text-transform: uppercase; }
.muted { color: var(--dim); }
.hidden { display: none !important; }

/* ---------- phone page ---------- */
.phone { max-width: 560px; margin: 0 auto; padding: 20px 16px 32px; min-height: 100vh; display: flex; flex-direction: column; }
.phone header { display: flex; align-items: center; gap: 12px; margin-bottom: 22px; }
.phone header img { width: 52px; height: auto; }
.phone header .school { font-size: 13px; color: var(--dim); line-height: 1.3; }
.progress { display: flex; gap: 6px; margin: 8px 0 18px; }
.progress span { width: 10px; height: 10px; border-radius: 50%; background: var(--line); }
.progress span.on { background: var(--maroon); }
.prompt { font-size: 22px; line-height: 1.35; margin: 0 0 22px; font-weight: 400; }
.equation { font-size: 24px; text-align: center; white-space: nowrap; padding: 18px 8px; margin: -6px 0 22px; border: 1.5px dashed var(--line); border-radius: 10px; letter-spacing: .02em; overflow-x: auto; }
.options { display: flex; flex-direction: column; gap: 10px; margin: 0; padding: 0; border: 0; }
.opt { display: flex; align-items: center; gap: 14px; width: 100%; text-align: left; padding: 16px; min-height: 60px;
  background: var(--tint); border: 2px solid transparent; border-radius: 10px; color: var(--ink); font-size: 17px; line-height: 1.3; cursor: pointer;
  -webkit-tap-highlight-color: transparent; }
.opt .letter { flex: 0 0 32px; height: 32px; border-radius: 50%; border: 1.5px solid var(--mute); display: grid; place-items: center; font-weight: 700; font-size: 14px; color: var(--dim); }
.opt[aria-checked="true"] { border-color: var(--maroon); background: #fff; }
.opt[aria-checked="true"] .letter { background: var(--maroon); border-color: var(--maroon); color: #fff; }
.opt:disabled { cursor: default; opacity: .6; }
.submit, .btn { -webkit-tap-highlight-color: transparent; }
.submit:focus-visible, .btn:focus-visible, .opt:focus-visible { outline: 3px solid var(--gold, #ffc107); outline-offset: 2px; }
.submit { margin-top: 22px; width: 100%; padding: 17px; border: 0; border-radius: 10px; background: var(--maroon); color: #fff; font-size: 18px; font-weight: 700; cursor: pointer; }
.submit:disabled { background: var(--line); color: var(--mute); cursor: default; }
.note { margin-top: 12px; font-size: 14px; color: var(--dim); min-height: 20px; }
.note.err { color: var(--red); }
.state { margin: auto 0; text-align: center; padding: 40px 8px; }
.state .icon { width: 72px; height: 72px; margin: 0 auto 18px; border-radius: 50%; display: grid; place-items: center; background: #eedfe2; color: var(--maroon); font-size: 34px; }
.state h2 { font-size: 26px; font-weight: 400; margin: 0 0 10px; }
.state p { color: var(--dim); font-size: 16px; line-height: 1.45; margin: 0; }
.spinner { width: 28px; height: 28px; border: 3px solid var(--line); border-top-color: var(--maroon); border-radius: 50%; animation: spin .8s linear infinite; margin: 60px auto; }
@keyframes spin { to { transform: rotate(360deg); } }
footer.small { margin-top: auto; padding-top: 28px; font-size: 12px; color: var(--mute); text-align: center; }

/* ---------- results (projector) ---------- */
.results { width: 100vw; height: 100vh; padding: 4.5vh 4.5vw 3vh; display: grid; grid-template-rows: auto 1fr auto; gap: 2.5vh; overflow: hidden; }
.results h1 { font-size: 4.2vh; font-weight: 400; margin: .8vh 0 0; }
.results .kicker { font-size: 1.5vh; }
.results .top { display: flex; justify-content: space-between; align-items: flex-start; }
.live { display: flex; align-items: center; gap: .8vh; font-size: 1.6vh; color: var(--dim); }
.live i { width: 1.1vh; height: 1.1vh; border-radius: 50%; background: var(--teal); animation: pulse 2s infinite; }
.live.stale i { background: var(--red); animation: none; }
@keyframes pulse { 50% { opacity: .3; } }
.grid { display: grid; grid-template-columns: 1fr 1.55fr 1.55fr; gap: 4vw; min-height: 0; }
.stats { display: flex; flex-direction: column; justify-content: space-between; padding: 1vh 0; }
.stat b { display: block; font-size: 6.4vh; font-weight: 400; color: var(--maroon); line-height: 1.05; }
.stat span { font-size: 1.9vh; color: var(--dim); }
.chart { display: flex; flex-direction: column; min-height: 0; }
.chart h3 { font-size: 2vh; font-weight: 700; margin: 0 0 .4vh; }
.chart .sub { font-size: 1.6vh; color: var(--mute); margin-bottom: 2vh; }
.bars { flex: 1; display: flex; align-items: flex-end; gap: 2.2vw; border-bottom: 1px solid var(--line); min-height: 0; }
.bar { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: flex-end; height: 100%; }
.bar .val { font-size: 2.3vh; font-weight: 700; margin-bottom: .8vh; color: var(--body); }
.bar .fill { width: 100%; border-radius: 4px 4px 0 0; transition: height .6s ease; min-height: 2px; }
.bars { position: relative; }
.bars .empty { position: absolute; inset: 0; display: grid; place-items: center; text-align: center; padding: 0 2vw; font-size: 2vh; color: var(--mute); }
.stat em { font-style: normal; color: var(--mute); font-size: 1.6vh; }
.labels { display: flex; gap: 2.2vw; margin-top: 1vh; }
.labels div { flex: 1; text-align: center; font-size: 1.9vh; color: var(--dim); }
.labels small { display: block; font-size: 1.5vh; color: var(--mute); margin-top: .3vh; }
.results footer { display: flex; align-items: center; gap: 1.2vw; font-size: 1.4vh; color: var(--mute); }
.results footer img { height: 4vh; }
.banner { position: fixed; inset: auto 0 0 0; padding: 12px; text-align: center; background: #fbd9db; color: #8a1018; font-size: 15px; }

/* ---------- admin ---------- */
.admin { max-width: 720px; margin: 0 auto; padding: 28px 16px 48px; }
.admin h1 { font-size: 28px; font-weight: 400; margin: 6px 0 24px; }
.card { background: var(--tint); border-radius: 10px; padding: 18px; margin-bottom: 16px; }
.card h2 { font-size: 13px; letter-spacing: .14em; text-transform: uppercase; color: var(--mute); margin: 0 0 12px; }
.row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 0; border-top: 1px solid #e6e6e6; }
.row:first-of-type { border-top: 0; }
.pill { font-size: 12px; font-weight: 700; padding: 4px 10px; border-radius: 99px; }
.pill.open { background: #d6ecea; color: var(--teal); }
.pill.closed { background: #e6e6e6; color: var(--dim); }
.btn { padding: 10px 16px; border-radius: 8px; border: 1.5px solid var(--maroon); background: #fff; color: var(--maroon); font-weight: 700; cursor: pointer; }
.btn.primary { background: var(--maroon); color: #fff; }
.btn:disabled { opacity: .5; cursor: default; }
input[type=text], input[type=password] { font: inherit; font-size: 16px; padding: 11px 12px; border: 1.5px solid var(--line); border-radius: 8px; width: 100%; background: #fff; }
.inline { display: flex; gap: 10px; }
.inline input { flex: 1; }
a { color: var(--maroon); }