:root {
  --bg: #10243a;
  --bg-2: #17324e;
  --ink: #10243a;
  --paper: #f4f7fb;
  --coral: #ff5d73;
  --coral-deep: #d63a52;
  --mint: #7ddec8;
  --text: #f4f7fb;
  --muted: #b7c6d6;
  --line: rgba(244, 247, 251, 0.16);
  --sans: "Noto Sans TC", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  background:
    radial-gradient(800px 420px at 80% -10%, rgba(255, 93, 115, 0.28), transparent 55%),
    radial-gradient(700px 380px at 0% 0%, rgba(125, 222, 200, 0.18), transparent 50%),
    var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
}
button, input { font: inherit; color: inherit; }
button { cursor: pointer; }
h1, h2, p { margin: 0; }
a { color: var(--mint); }

.app { width: min(720px, calc(100% - 28px)); margin: 0 auto; padding: 22px 0 48px; }
.eyebrow { color: var(--mint); letter-spacing: 0.16em; font-size: 12px; font-weight: 700; }
h1 { font-size: clamp(1.8rem, 6vw, 2.5rem); font-weight: 900; letter-spacing: 0.02em; }
.lead, .muted { color: var(--muted); }
.lead { margin: 8px 0 18px; }
.stack { display: grid; gap: 12px; }
.card, .stage {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 16px;
}
.row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
label { display: grid; gap: 6px; }
label span, .fine { color: var(--muted); font-size: 13px; }
input:not([type="checkbox"]):not([type="radio"]):not([type="button"]):not([type="submit"]):not([type="hidden"]) {
  width: 100%;
  border: 1px solid #c5d2de;
  background: #ffffff;
  color: #10243a;
  -webkit-text-fill-color: #10243a;
  caret-color: #10243a;
  font-size: 16px;
  border-radius: 12px;
  padding: 12px;
  outline: none;
  -webkit-user-select: text;
  user-select: text;
}
input::placeholder { color: #7b8b9a; -webkit-text-fill-color: #7b8b9a; opacity: 1; }
input:focus { border-color: var(--mint); }
.btn, .draw-btn, .tap {
  border: 0;
  border-radius: 999px;
  padding: 12px 16px;
  font-weight: 700;
}
.btn { background: var(--paper); color: var(--ink); }
.btn.ghost { background: transparent; color: var(--text); border: 1px solid var(--line); }
.btn.coral, .draw-btn {
  background: linear-gradient(180deg, #ff8b9a, var(--coral) 45%, var(--coral-deep));
  color: white;
}
.btn:disabled, .draw-btn:disabled, .tap:disabled { opacity: 0.45; cursor: default; }
.wide { width: 100%; }
.draw-btn { width: 100%; font-size: 1.25rem; letter-spacing: 0.12em; padding: 16px; }

.code {
  font-size: 2rem;
  font-weight: 900;
  letter-spacing: 0.2em;
}
.join-grid { display: grid; grid-template-columns: 168px 1fr; gap: 12px; align-items: center; }
.join-grid canvas { width: 168px; height: 168px; border-radius: 12px; background: white; }
.chips { display: flex; gap: 8px; overflow: auto; }
.chip {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  border-radius: 16px;
  padding: 8px 12px;
  text-align: left;
  min-width: 96px;
}
.chip b { display: block; }
.chip span { color: var(--muted); font-size: 12px; }
.chip.on { border-color: var(--mint); background: rgba(125, 222, 200, 0.12); }

.stage {
  min-height: 240px;
  display: grid;
  align-content: center;
  justify-items: center;
  text-align: center;
  background: radial-gradient(90% 80% at 50% 0%, #ffffff, var(--paper) 70%);
  color: var(--ink);
  position: relative;
  overflow: hidden;
}
.kicker { letter-spacing: 0.14em; font-size: 13px; color: #5d7388; }
.stage-name {
  font-weight: 900;
  font-size: clamp(40px, 10vw, 72px);
  line-height: 1.15;
  word-break: break-word;
}
.stage.spinning .stage-name { animation: flicker 0.12s linear infinite; }
@keyframes flicker { 50% { opacity: 0.45; } }

.tap {
  width: 100%;
  min-height: 42vh;
  margin-top: 12px;
  border-radius: 28px;
  background: #24506a;
  color: #d5e4ef;
  font-size: clamp(2rem, 10vw, 3.4rem);
  letter-spacing: 0.14em;
}
.tap.go {
  background: linear-gradient(180deg, #ffe08a, #ffb703 30%, var(--coral));
  color: #10243a;
}
.names { color: var(--muted); font-size: 14px; }
.winner { display: flex; justify-content: space-between; gap: 8px; padding: 8px 0; border-bottom: 1px solid var(--line); }
.prize-row { display: grid; grid-template-columns: 1fr 88px auto; gap: 8px; align-items: end; }
.check { display: flex; gap: 8px; align-items: center; color: var(--muted); }
.toast {
  position: fixed; left: 50%; bottom: 16px; transform: translateX(-50%);
  background: var(--paper); color: var(--ink); border-radius: 999px;
  padding: 10px 16px; max-width: min(480px, calc(100% - 24px));
}
.toast.bad { background: #3a2230; color: #ffd0d8; }
.err { color: #ffb4c0; }

@media (max-width: 640px) {
  .join-grid, .prize-row { grid-template-columns: 1fr; }
  .join-grid { justify-items: center; text-align: center; }
}
@media (prefers-reduced-motion: reduce) {
  .stage.spinning .stage-name { animation: none; }
}