:root {
  --bg: #0b1e33;
  --bg2: #12304f;
  --card: #fdf8ec;
  --ink: #1b2430;
  --muted: #5d6b7c;
  --gold: #f2b134;
  --gold-dark: #c98a10;
  --teal: #1fa6a0;
  --red: #d9483b;
  --green: #2e9e5b;
  --radius: 14px;
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: radial-gradient(1200px 700px at 70% -10%, #1d4f7a 0%, var(--bg) 60%) fixed;
  line-height: 1.5;
}
.hidden { display: none !important; }

/* HUD */
#hud {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 10px 20px; color: #fff;
  background: rgba(8, 22, 38, .92); backdrop-filter: blur(6px);
  border-bottom: 2px solid var(--gold);
}
.hud-left { display: flex; flex-direction: column; font-size: .9rem; min-width: 0; }
#hud-team { font-weight: 700; color: var(--gold); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#hud-room { opacity: .85; font-size: .8rem; }
.hud-mid { display: flex; gap: 6px; }
.pip { width: 26px; height: 8px; border-radius: 4px; background: #34506b; }
.pip.done { background: var(--green); }
.pip.now { background: var(--gold); }
.hud-right { text-align: right; }
.hud-label { display: block; font-size: .65rem; text-transform: uppercase; letter-spacing: .08em; opacity: .7; }
#hud-timer { font-size: 1.6rem; font-weight: 800; font-variant-numeric: tabular-nums; }
#hud-timer.low { color: #ff7b6b; animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .5; } }

/* Layout */
#app { max-width: 860px; margin: 0 auto; padding: 24px 16px 60px; }
.card {
  background: var(--card); border-radius: var(--radius); padding: 28px;
  box-shadow: 0 10px 30px rgba(0,0,0,.35);
  animation: rise .35s ease-out;
}
@keyframes rise { from { opacity: 0; transform: translateY(12px); } }
.card + .card { margin-top: 18px; }
h1 { margin: 0 0 4px; font-size: 2.2rem; letter-spacing: -.02em; }
h2 { margin: 0 0 8px; font-size: 1.5rem; }
.eyebrow { text-transform: uppercase; letter-spacing: .12em; font-size: .75rem; color: var(--gold-dark); font-weight: 700; }
.tagline { color: var(--muted); margin: 0 0 18px; }
.story { font-size: 1.05rem; }
.rules { margin: 14px 0; padding-left: 20px; }
.rules li { margin: 4px 0; }

/* Form + buttons */
label { display: block; font-weight: 600; margin: 14px 0 4px; }
input[type=text], select {
  width: 100%; padding: 12px 14px; font-size: 1.05rem;
  border: 2px solid #c9c2ae; border-radius: 10px; background: #fff;
}
input[type=text]:focus, select:focus { outline: none; border-color: var(--teal); }
.btn {
  display: inline-block; padding: 12px 24px; font-size: 1.05rem; font-weight: 700;
  border: none; border-radius: 10px; cursor: pointer;
  background: var(--gold); color: #2a1d00; box-shadow: 0 3px 0 var(--gold-dark);
  transition: transform .08s;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(2px); box-shadow: none; }
.btn.ghost { background: transparent; color: var(--muted); box-shadow: none; border: 2px solid #c9c2ae; font-weight: 600; padding: 8px 16px; font-size: .9rem; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-top: 18px; }

/* Group picker */
.pick-title { font-weight: 700; margin: 18px 0 8px; }
.groups { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 10px; }
.group-btn {
  text-align: left; padding: 12px 14px; cursor: pointer; background: #fff;
  border: 2px solid #d5cfbd; border-radius: 12px; font-family: inherit; color: var(--ink);
  display: flex; flex-direction: column; gap: 2px; transition: border-color .1s, background .1s;
}
.group-btn:hover { border-color: var(--teal); background: #f0fbfa; }
.group-btn.selected { border-color: var(--gold-dark); background: #fff4d6; box-shadow: 0 0 0 3px rgba(242,177,52,.45); }
.g-name { font-weight: 800; font-size: 1.1rem; }
.g-nums { color: var(--muted); font-size: .9rem; }

.codebox { margin-top: 16px; padding: 16px; background: #fff; border: 2px solid #e6dfca; border-radius: 12px; }
.codebox label { margin-top: 0; }
.code-input { font-size: 1.6rem; letter-spacing: .2em; text-transform: uppercase; font-weight: 800; max-width: 420px; }
.code-input::placeholder { font-size: 1rem; letter-spacing: normal; font-weight: 400; text-transform: none; }

/* Question */
.qmeta { display: flex; justify-content: space-between; color: var(--muted); font-size: .85rem; margin-bottom: 8px; }
.question { font-size: 1.4rem; font-weight: 700; margin: 6px 0 18px; }
.options { display: grid; gap: 10px; }
.opt {
  text-align: left; padding: 14px 16px; font-size: 1.05rem;
  background: #fff; border: 2px solid #d5cfbd; border-radius: 12px; cursor: pointer;
  color: var(--ink); transition: border-color .1s, background .1s;
}
.opt:hover:not(:disabled) { border-color: var(--teal); background: #f0fbfa; }
.opt.crossed { background: #f0e1df; border-color: #d9a39c; color: #8a6a66; text-decoration: line-through; cursor: not-allowed; }
.opt.right { background: #e0f4e8; border-color: var(--green); }
.opt:disabled { cursor: default; }

.feedback { margin-top: 16px; padding: 14px 16px; border-radius: 12px; }
.feedback.good { background: #e0f4e8; border-left: 5px solid var(--green); }
.feedback.hint { background: #fff4d6; border-left: 5px solid var(--gold); }

/* Clue tiles */
.board-title { font-weight: 700; margin-bottom: 10px; }
.tiles { display: flex; flex-wrap: wrap; gap: 10px; min-height: 64px; }
.tile {
  width: 56px; height: 64px; display: grid; place-items: center;
  font-size: 1.9rem; font-weight: 800; color: #3a2a00;
  background: linear-gradient(#f9d57a, var(--gold)); border-radius: 8px;
  box-shadow: 0 3px 0 var(--gold-dark); animation: pop .4s cubic-bezier(.2, 1.6, .4, 1);
}
.tile.empty { background: #e7e0cc; box-shadow: none; color: transparent; border: 2px dashed #bdb59b; }
@keyframes pop { from { transform: scale(.2) rotate(-20deg); opacity: 0; } }
.clue-note { color: var(--muted); font-size: .9rem; margin-top: 8px; }

/* Lock */
.lock-input { font-size: 1.8rem; letter-spacing: .3em; text-transform: uppercase; text-align: center; font-weight: 800; max-width: 340px; }
.shake { animation: shake .4s; }
@keyframes shake { 20%, 60% { transform: translateX(-8px); } 40%, 80% { transform: translateX(8px); } }
.error-msg { color: var(--red); font-weight: 600; min-height: 1.4em; margin-top: 8px; }

/* Lockout overlay */
#lockout {
  position: fixed; inset: 0; z-index: 50; display: grid; place-items: center;
  background: rgba(5, 12, 22, .82); backdrop-filter: blur(3px);
}
.lockout-box {
  width: calc(100% - 32px);
  background: #fff; border-radius: 16px; padding: 30px 34px; max-width: 480px; text-align: center;
  border-top: 8px solid var(--red); animation: rise .25s;
}
.lockout-box.detour { border-top-color: var(--gold); }
#lockout-title { font-size: 1.5rem; font-weight: 800; margin-bottom: 8px; }
#lockout-count { font-size: 3rem; font-weight: 800; margin-top: 10px; font-variant-numeric: tabular-nums; }

/* End */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin: 18px 0; }
.stat { background: #fff; border-radius: 12px; padding: 14px; text-align: center; border: 2px solid #e6dfca; }
.stat b { display: block; font-size: 1.6rem; }
.stat span { color: var(--muted); font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; }
.code-box { text-align: center; font-size: 1.6rem; font-weight: 800; letter-spacing: .15em; padding: 14px; border: 3px dashed var(--gold-dark); border-radius: 12px; background: #fff9e8; }
.small { font-size: .85rem; color: var(--muted); }
.teacher-link { text-align: center; margin-top: 24px; }
.teacher-link button { background: none; border: none; color: #8fa7bf; cursor: pointer; text-decoration: underline; font-size: .85rem; }

@media (max-width: 560px) {
  .btn { min-height: 48px; }
  .btn.ghost { min-height: 44px; }
  .lockout-box { padding: 24px 20px; }
  #lockout-count { font-size: 2.6rem; }
  .hud-mid { display: none; }
  .card { padding: 20px; }
  h1 { font-size: 1.7rem; }
  .question { font-size: 1.2rem; }
}