@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;600&display=swap');

:root {
  --bg: #070b12;
  --bg2: #0c121d;
  --panel: #111927;
  --panel2: #162133;
  --line: #22304a;
  --text: #e6edf7;
  --muted: #8b9ab3;
  --cyan: #22d3ee;
  --cyan-dim: rgba(34, 211, 238, .14);
  --green: #34d399;
  --green-dim: rgba(52, 211, 153, .14);
  --red: #f87171;
  --red-dim: rgba(248, 113, 113, .14);
  --amber: #fbbf24;
  --amber-dim: rgba(251, 191, 36, .14);
  --violet: #a78bfa;
  --radius: 12px;
  --mono: 'JetBrains Mono', ui-monospace, Consolas, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: radial-gradient(1200px 600px at 80% -10%, rgba(34,211,238,.08), transparent 60%),
              radial-gradient(900px 500px at -10% 110%, rgba(167,139,250,.07), transparent 60%), var(--bg);
  color: var(--text);
  font: 15px/1.5 Inter, system-ui, Segoe UI, sans-serif;
}
button, input, textarea, select { font: inherit; color: inherit; }
[hidden] { display: none !important; }
a { color: var(--cyan); }

/* ---------- top bar ---------- */
.topbar {
  display: flex; align-items: center; gap: 16px; padding: 12px 20px;
  border-bottom: 1px solid var(--line); background: rgba(7,11,18,.85); backdrop-filter: blur(8px);
  position: sticky; top: 0; z-index: 20;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: .06em; }
.brand .logo {
  width: 30px; height: 30px; border-radius: 8px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--cyan), var(--violet)); color: #041018; font-size: 16px;
}
.brand small { display: block; font-weight: 500; letter-spacing: 0; color: var(--muted); font-size: 12px; }
.spacer { flex: 1; }
.timer {
  font-family: var(--mono); font-size: 20px; font-weight: 600; padding: 4px 12px; border-radius: 8px;
  background: var(--panel); border: 1px solid var(--line);
}
.timer.warn { color: var(--amber); border-color: var(--amber); }
.timer.crit { color: var(--red); border-color: var(--red); animation: pulse 1s infinite; }
.chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; border-radius: 999px;
  background: var(--panel); border: 1px solid var(--line); font-size: 13px; white-space: nowrap;
}
.chip b { font-family: var(--mono); }
.status-pill { text-transform: uppercase; font-size: 11px; font-weight: 700; letter-spacing: .08em; }
.status-running { color: var(--green); border-color: var(--green); }
.status-paused { color: var(--amber); border-color: var(--amber); }
.status-lobby { color: var(--cyan); border-color: var(--cyan); }
.status-ended { color: var(--red); border-color: var(--red); }

/* ---------- generic ---------- */
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); }
.btn {
  border: 1px solid var(--line); background: var(--panel2); padding: 9px 16px; border-radius: 10px;
  cursor: pointer; font-weight: 600; transition: .15s;
}
.btn:hover { border-color: var(--cyan); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.primary { background: var(--cyan); color: #041018; border-color: var(--cyan); }
.btn.primary:hover { filter: brightness(1.1); }
.btn.green { background: var(--green); color: #03140d; border-color: var(--green); }
.btn.danger { border-color: var(--red); color: var(--red); background: transparent; }
.btn.danger.armed { background: var(--red); color: #1a0505; }
.btn.small { padding: 5px 10px; font-size: 13px; }
.input, textarea.input {
  width: 100%; background: var(--bg2); border: 1px solid var(--line); border-radius: 10px;
  padding: 10px 12px; outline: none;
}
.input:focus { border-color: var(--cyan); box-shadow: 0 0 0 3px var(--cyan-dim); }
.muted { color: var(--muted); }
.mono { font-family: var(--mono); }
h1, h2, h3 { margin: 0; line-height: 1.2; }

/* ---------- join ---------- */
.join-wrap { min-height: calc(100vh - 60px); display: grid; place-items: center; padding: 24px 16px; }
.join { width: min(560px, 100%); padding: 32px; }
.join h1 { font-size: 30px; margin-bottom: 6px; }
.join .tag { color: var(--cyan); font-family: var(--mono); font-size: 13px; letter-spacing: .08em; margin-bottom: 14px; }
.join form { display: grid; gap: 12px; margin-top: 22px; }
.join .rules { margin: 18px 0 0; padding: 0; list-style: none; display: grid; gap: 8px; }
.join .rules li { display: flex; gap: 10px; color: var(--muted); }
.join .rules li span:first-child { width: 22px; flex: none; }
.err { color: var(--red); min-height: 20px; font-size: 14px; }

/* ---------- game layout ---------- */
.game { display: grid; grid-template-columns: 250px minmax(0, 1fr) 300px; gap: 16px; padding: 16px; height: calc(100vh - 60px); }
.levels { padding: 10px; overflow: auto; }
.levels h3, .side h3 { font-size: 12px; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); padding: 6px 8px 10px; }
.lvl {
  display: flex; align-items: center; gap: 10px; width: 100%; text-align: left; padding: 9px 10px;
  border-radius: 10px; border: 1px solid transparent; background: transparent; cursor: pointer; margin-bottom: 4px;
}
.lvl:hover:not(:disabled) { background: var(--panel2); }
.lvl.active { background: var(--panel2); border-color: var(--cyan); }
.lvl:disabled { cursor: not-allowed; opacity: .45; }
.lvl .em { font-size: 20px; width: 30px; text-align: center; }
.lvl .meta { flex: 1; min-width: 0; }
.lvl .meta b { display: block; font-size: 14px; }
.lvl .meta small { color: var(--muted); font-size: 12px; }
.lvl .st { font-size: 14px; }
.lvl.solved .st { color: var(--green); }
.lvl.skipped .st { color: var(--amber); }

.stage { display: flex; flex-direction: column; min-height: 0; overflow: hidden; }
.level-head { padding: 18px 20px; border-bottom: 1px solid var(--line); display: flex; gap: 16px; align-items: flex-start; }
.avatar {
  width: 58px; height: 58px; flex: none; border-radius: 14px; display: grid; place-items: center; font-size: 30px;
  background: linear-gradient(135deg, var(--panel2), var(--bg2)); border: 1px solid var(--line);
}
.level-head .kicker { font-family: var(--mono); font-size: 12px; color: var(--cyan); letter-spacing: .08em; }
.level-head h2 { font-size: 22px; margin: 2px 0 6px; }
.level-head p { margin: 0; color: var(--muted); }
.defenses { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.defenses .chip { font-size: 12px; padding: 2px 9px; background: var(--red-dim); border-color: rgba(248,113,113,.35); color: #fecaca; }
.pts { margin-left: auto; text-align: right; flex: none; }
.pts b { font-family: var(--mono); font-size: 22px; color: var(--amber); display: block; }
.pts small { color: var(--muted); }

.chat { flex: 1; overflow-y: auto; padding: 18px 20px; display: flex; flex-direction: column; gap: 12px; }
.msg { max-width: 82%; padding: 10px 14px; border-radius: 14px; white-space: pre-wrap; word-wrap: break-word; }
.msg.user { align-self: flex-end; background: var(--cyan-dim); border: 1px solid rgba(34,211,238,.35); border-bottom-right-radius: 4px; }
.msg.bot { align-self: flex-start; background: var(--panel2); border: 1px solid var(--line); border-bottom-left-radius: 4px; }
.msg.blocked { align-self: flex-start; background: var(--red-dim); border: 1px dashed var(--red); color: #fecaca; font-family: var(--mono); font-size: 13px; }
.msg.user.filtered { opacity: .6; text-decoration: line-through; text-decoration-color: var(--red); }
.msg .who { display: block; font-size: 11px; font-weight: 700; color: var(--muted); letter-spacing: .06em; margin-bottom: 3px; text-transform: uppercase; }
.msg.system { align-self: center; background: transparent; color: var(--muted); font-size: 13px; text-align: center; max-width: 90%; }
.typing span { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--muted); margin: 0 2px; animation: blink 1.2s infinite; }
.typing span:nth-child(2) { animation-delay: .2s; } .typing span:nth-child(3) { animation-delay: .4s; }

.composer { border-top: 1px solid var(--line); padding: 12px 16px; display: grid; gap: 10px; }
.composer form { display: flex; gap: 10px; align-items: flex-end; }
.composer textarea { resize: none; min-height: 46px; max-height: 180px; }
.counter { font-size: 12px; color: var(--muted); font-family: var(--mono); }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.mem-note { font-size: 12px; }

/* hints: one toggled card above the input, fixed max height so the chat never shrinks */
.hint-bar { display: grid; gap: 8px; }
.composer { grid-template-columns: minmax(0, 1fr); }
.hint-row { gap: 6px; }
.hint-row .btn { white-space: nowrap; }
#hintBtn { margin-left: auto; }
#hintToggle.on { border-color: var(--amber); color: var(--amber); }
#hintBtn.armed { border-color: var(--amber); background: var(--amber-dim); color: var(--amber); }
.hint-nav { display: flex; align-items: center; gap: 4px; }
.hint-pos { font-family: var(--mono); font-size: 12px; color: var(--muted); min-width: 26px; text-align: center; }
.btn.icon { padding: 3px 9px; font-size: 16px; line-height: 1.2; }
.hint {
  background: var(--amber-dim); border: 1px solid rgba(251,191,36,.35); border-radius: 10px; padding: 8px 12px;
  font-size: 14px; max-height: 6.5em; overflow-y: auto; overscroll-behavior: contain; outline: none;
}
.hint:focus-visible { box-shadow: 0 0 0 3px var(--amber-dim); }
.hint b { color: var(--amber); }

/* answer pop-up */
.modal { padding: 0; border: 0; background: transparent; color: var(--text); width: min(440px, calc(100% - 32px)); max-width: none; }
.modal::backdrop { background: rgba(7,11,18,.75); backdrop-filter: blur(3px); }
.modal-body { padding: 18px; display: grid; gap: 10px; }
.modal-head { display: flex; align-items: center; gap: 10px; }
.modal-head h3 { flex: 1; font-size: 18px; }
.modal-body p { margin: 0; font-size: 14px; }
.guess-input { font-family: var(--mono); text-transform: uppercase; letter-spacing: .08em; }
.modal .err { min-height: 0; }
.modal .err:empty { display: none; }
.modal .err.warn { color: var(--amber); }
.solved-banner { background: var(--green-dim); border: 1px solid var(--green); color: var(--green); border-radius: 10px; padding: 10px 14px; font-weight: 600; }
.solved-banner.skipped { background: var(--amber-dim); border-color: var(--amber); color: var(--amber); }

.side { display: flex; flex-direction: column; gap: 16px; min-height: 0; }
.side .card { padding: 10px; }
.side .mini-board { flex: 1.3; overflow: auto; min-height: 0; }
.side .feed { flex: 1; overflow: auto; min-height: 0; }
.mb-row { display: flex; align-items: center; gap: 8px; padding: 6px 8px; border-radius: 8px; font-size: 14px; }
.mb-row.me { background: var(--cyan-dim); }
.mb-row .rk { width: 26px; font-family: var(--mono); color: var(--muted); }
.mb-row .nm { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mb-row .sc { font-family: var(--mono); color: var(--amber); }
.pips { display: flex; gap: 3px; }
.pip { width: 7px; height: 7px; border-radius: 2px; background: var(--line); }
.pip.on { background: var(--green); }
.pip.fb { background: var(--red); }
.pip.skp { background: var(--amber); opacity: .55; }
.ev { font-size: 13px; padding: 6px 8px; border-bottom: 1px solid var(--line); }
.ev:last-child { border-bottom: 0; }
.ev time { color: var(--muted); font-family: var(--mono); font-size: 11px; margin-right: 6px; }
.ev.firstblood { color: #fecaca; } .ev.honeypot { color: var(--amber); } .ev.announce { color: var(--cyan); font-weight: 600; }
.ev.champion { color: var(--green); font-weight: 700; }
.ev.teach { color: var(--violet); font-weight: 600; }

/* ---------- overlay / toast ---------- */
.overlay {
  position: fixed; inset: 60px 0 0 0; background: rgba(7,11,18,.8); backdrop-filter: blur(4px);
  display: grid; place-items: center; z-index: 30; padding: 16px;
}
.overlay .card { padding: 30px 36px; text-align: center; max-width: 520px; }
.overlay .big { font-size: 46px; margin-bottom: 8px; }
.overlay h2 { margin-bottom: 8px; }
.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%) translateY(20px); opacity: 0;
  background: var(--panel2); border: 1px solid var(--line); padding: 12px 18px; border-radius: 12px; z-index: 60;
  transition: .25s; max-width: calc(100% - 32px); font-weight: 600; pointer-events: none;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.good { border-color: var(--green); color: var(--green); }
.toast.bad { border-color: var(--red); color: var(--red); }
.toast.warn { border-color: var(--amber); color: var(--amber); }
.confetti { position: fixed; top: -10px; width: 9px; height: 14px; z-index: 70; pointer-events: none; animation: fall linear forwards; }

@keyframes fall { to { transform: translateY(105vh) rotate(720deg); } }
@keyframes pulse { 50% { opacity: .55; } }
@keyframes blink { 0%, 80%, 100% { opacity: .2; } 40% { opacity: 1; } }
@keyframes glow { 50% { box-shadow: 0 0 0 4px var(--cyan-dim); } }

/* ---------- responsive ---------- */
@media (max-width: 1150px) {
  .game { grid-template-columns: 220px minmax(0, 1fr); }
  .side { display: none; }
}
@media (max-width: 760px) {
  .topbar { flex-wrap: wrap; padding: 10px 16px; gap: 8px; }
  .game { grid-template-columns: 1fr; height: auto; padding: 12px 16px; }
  .levels { display: flex; overflow-x: auto; gap: 4px; padding: 8px; }
  .levels h3 { display: none; }
  .lvl { flex: none; width: auto; margin: 0; }
  .lvl .meta small { display: none; }
  .stage { min-height: 70vh; }
  .level-head { flex-wrap: wrap; }
  .chat { min-height: 45vh; }  /* never squeeze the conversation down to a couple of lines */
  .composer { padding: 10px 12px; gap: 8px; }
  .composer textarea { max-height: 120px; }
  .hint { max-height: 5em; }
  /* 16px stops iOS Safari zooming the page when an input gets focus */
  .input, textarea.input { font-size: 16px; }
  .msg { max-width: 95%; }
  .overlay { inset: 0; }
  /* keep the answer pop-up near the top so the on-screen keyboard doesn't cover it */
  .modal { margin-top: 12vh; }
}

/* ---------- scoreboard (projector) ---------- */
body.board { overflow: hidden; }
.board-wrap { display: grid; grid-template-columns: minmax(0, 1fr) 380px; gap: 20px; padding: 20px; height: calc(100vh - 70px); }
.board-title { font-size: 26px; font-weight: 800; }
.board-timer { font-size: 38px; padding: 6px 18px; }
.table { overflow: hidden; display: flex; flex-direction: column; }
.thead, .trow { display: grid; grid-template-columns: 70px minmax(0, 1fr) 330px 120px; align-items: center; gap: 12px; padding: 10px 20px; }
.thead { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .1em; border-bottom: 1px solid var(--line); }
.tbody { overflow: hidden; flex: 1; }
.trow { border-bottom: 1px solid var(--line); font-size: 20px; transition: background .5s; }
.trow.flash { background: var(--green-dim); }
.trow .rk { font-family: var(--mono); font-weight: 700; font-size: 22px; }
.trow .nm { font-weight: 700; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.trow .sc { font-family: var(--mono); font-weight: 700; color: var(--amber); text-align: right; font-size: 24px; }
.trow.top1 .rk { color: #fcd34d; } .trow.top2 .rk { color: #cbd5e1; } .trow.top3 .rk { color: #d97706; }
.bpips { display: grid; grid-template-columns: repeat(10, 1fr); gap: 5px; }
.bpip { height: 22px; border-radius: 5px; background: var(--bg2); border: 1px solid var(--line); display: grid; place-items: center; font-size: 11px; font-family: var(--mono); color: var(--muted); }
.bpip.on { background: var(--green); border-color: var(--green); color: #03140d; font-weight: 700; }
.bpip.fb { background: var(--red); border-color: var(--red); color: #1a0505; }
.bpip.cur { border-color: var(--cyan); animation: glow 1.4s infinite; }
.bpip.skp { border: 1px dashed var(--amber); color: var(--amber); }
.board-side { display: flex; flex-direction: column; gap: 16px; min-height: 0; }
.stats { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; padding: 14px; }
.stat b { display: block; font-family: var(--mono); font-size: 28px; }
.stat small { color: var(--muted); text-transform: uppercase; letter-spacing: .08em; font-size: 11px; }
.lvlstats { padding: 14px; display: grid; gap: 6px; }
.lvlbar { display: grid; grid-template-columns: 30px 80px 1fr 30px; gap: 8px; align-items: center; font-size: 14px; }
.lvlbar .bar { height: 8px; background: var(--bg2); border-radius: 4px; overflow: hidden; }
.lvlbar .bar i { display: block; height: 100%; background: linear-gradient(90deg, var(--cyan), var(--green)); }
.board-feed { flex: 1; overflow: hidden; padding: 10px 14px; }
.board-feed .ev { font-size: 15px; }
.join-url { font-family: var(--mono); color: var(--cyan); font-size: 18px; }
.empty { padding: 40px; text-align: center; color: var(--muted); font-size: 20px; }
body.board .brand { min-width: 0; flex-shrink: 1; }
body.board .board-title { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
body.board .topbar > *:not(.brand) { flex-shrink: 0; white-space: nowrap; }
body.board .topbar > .spacer { flex-shrink: 1; }
.fs-btn { font-size: 18px; line-height: 1; padding: 6px 10px; }
.fs-prompt { position: fixed; inset: 0; display: grid; place-items: center; z-index: 50; background: rgba(7,11,18,.55); }
.fs-prompt button { display: grid; gap: 8px; justify-items: center; padding: 28px 40px; cursor: pointer; font-size: 20px; }
.fs-prompt button:hover { border-color: var(--cyan); }
.fs-prompt .big { font-size: 48px; line-height: 1; color: var(--cyan); }
.fs-prompt small { font-size: 14px; }
body.board.idle, body.board.idle * { cursor: none !important; }
/* Projectors are often 1024–1366 px wide, or a 1080p screen at 125–150% Windows scaling */
@media (max-width: 1400px) {
  .board-wrap { grid-template-columns: minmax(0, 1fr) 310px; gap: 16px; padding: 16px; }
  .thead, .trow { grid-template-columns: 56px minmax(0, 1fr) 260px 90px; gap: 10px; padding: 9px 14px; }
  .bpips { gap: 4px; }
  .board-title { font-size: 22px; }
  .board-timer { font-size: 32px; }
  .lvlbar { grid-template-columns: 26px 72px 1fr 26px; font-size: 13px; }
}
@media (max-height: 760px) {
  .board-wrap { height: calc(100vh - 62px); }
  .trow { font-size: 18px; padding-top: 6px; padding-bottom: 6px; }
  .stats { padding: 10px; } .stat b { font-size: 24px; }
  .lvlstats { padding: 10px; gap: 4px; }
}
@media (max-width: 1000px) { .board-wrap { grid-template-columns: 1fr; height: auto; } body.board { overflow: auto; } .thead, .trow { grid-template-columns: 50px 1fr 90px; } .thead .c3, .trow .bpips { display: none; } }

/* ---------- admin ---------- */
.admin-wrap { padding: 20px; display: grid; gap: 16px; max-width: 1400px; margin: 0 auto; }
.admin-wrap .card { padding: 18px; }
.admin-wrap h2 { font-size: 16px; margin-bottom: 12px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 900px) { .grid2 { grid-template-columns: 1fr; } }
table.t { width: 100%; border-collapse: collapse; font-size: 14px; }
table.t th { text-align: left; color: var(--muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .06em; padding: 8px; border-bottom: 1px solid var(--line); }
table.t td { padding: 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
.secret { font-family: var(--mono); color: var(--amber); font-weight: 600; letter-spacing: .05em; }
.blurred { filter: blur(6px); transition: .2s; cursor: pointer; }
.blurred:hover { filter: none; }
.convo { max-height: 520px; overflow: auto; display: grid; gap: 6px; }
.convo .m { padding: 6px 10px; border-radius: 8px; white-space: pre-wrap; font-size: 13px; }
.convo .m.user { background: var(--cyan-dim); }
.convo .m.assistant { background: var(--panel2); }
.convo .m.blk { background: var(--red-dim); }
details.sol summary { cursor: pointer; color: var(--cyan); }
.scroll-x { overflow-x: auto; }

/* ---------- admin: prompt guide ---------- */
.guide-top > summary { cursor: pointer; }
.guide-top > summary h2 { display: inline; margin: 0; }
#guide { margin-top: 14px; display: grid; gap: 10px; }
#guide h3 { font-size: 12px; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); margin-top: 10px; }
#guide p { margin: 4px 0; }
#guide ul { margin: 4px 0; padding-left: 20px; }
.guide-basics { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 12px; }
.guide-basics > div { background: var(--bg2); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; }
.guide-basics p { color: var(--muted); font-size: 14px; }
.guide-lvl { border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; background: var(--bg2); }
.guide-lvl > summary { cursor: pointer; }
.guide-lvl[open] > summary { margin-bottom: 8px; color: var(--cyan); }
.gp { margin: 8px 0; border: 1px solid var(--line); border-radius: 10px; background: var(--panel); }
.gp-head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; padding: 8px 10px; border-bottom: 1px solid var(--line); font-size: 14px; }
.gp pre { margin: 0; padding: 10px 12px; font-family: var(--mono); font-size: 13px; white-space: pre-wrap; word-break: break-word; }
.chip.ok { color: var(--green); border-color: var(--green); font-size: 11px; }
.chip.untested { color: var(--amber); border-color: var(--amber); font-size: 11px; }

/* ---------- debrief (admin, projector) ---------- */
.debrief { position: fixed; inset: 0; z-index: 50; background: var(--bg); display: flex; flex-direction: column; }
.db-top { display: flex; align-items: center; gap: 12px; padding: 12px 20px; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.db-brand { font-size: 18px; }
.db-tabs { display: flex; gap: 6px; flex-wrap: wrap; }
.db-tab { min-width: 44px; padding: 6px 10px; border-radius: 8px; border: 1px solid var(--line); background: var(--panel);
  color: var(--text); font: inherit; font-family: var(--mono); cursor: pointer; }
.db-tab small { color: var(--muted); margin-left: 4px; }
.db-tab.none { opacity: .45; }
.db-tab.on { border-color: var(--cyan); background: var(--cyan-dim); color: var(--cyan); }
.db-opt { font-size: 14px; color: var(--muted); }
.db-body { flex: 1; overflow: auto; padding: 28px clamp(16px, 5vw, 72px); display: grid; gap: 18px; align-content: start; }
.db-head h1 { margin: 0; font-size: clamp(24px, 3vw, 40px); }
.db-head .row { margin-top: 10px; }
.db-teach { font-size: clamp(16px, 1.6vw, 22px); color: var(--muted); margin: 0; }
.db-teach b { color: var(--text); }
.db-solver { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; font-size: clamp(15px, 1.4vw, 20px); }
.db-solver .who { font-weight: 700; }
.db-prompt { background: var(--cyan-dim); border: 1px solid var(--cyan); border-radius: var(--radius); padding: 20px 24px;
  font-family: var(--mono); font-size: clamp(17px, 1.9vw, 28px); line-height: 1.45; white-space: pre-wrap; overflow-wrap: anywhere; }
.db-reply { background: var(--panel2); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 20px;
  font-size: clamp(15px, 1.4vw, 20px); white-space: pre-wrap; overflow-wrap: anywhere; }
.db-label { font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; }
.db-convo { display: grid; gap: 8px; }
.db-turn { display: grid; gap: 4px; padding: 10px 14px; border-radius: 10px; background: var(--panel); border: 1px solid var(--line);
  white-space: pre-wrap; overflow-wrap: anywhere; font-size: clamp(14px, 1.2vw, 17px); }
.db-turn .p { font-family: var(--mono); }
.db-turn .r { color: var(--muted); }
.db-turn.blk { border-color: var(--red); background: var(--red-dim); }
.db-turn.win { border-color: var(--green); background: var(--green-dim); }
.db-tag { font-size: 12px; font-weight: 700; font-family: var(--mono); }
.db-tag.blk { color: var(--red); }
.db-tag.win { color: var(--green); }
.db-empty { font-size: clamp(18px, 2vw, 26px); color: var(--muted); }
.db-keys { padding: 8px 20px; font-size: 12px; border-top: 1px solid var(--line); }
@media (max-width: 760px) { .db-keys { display: none; } }
body.db-open { overflow: hidden; }

/* ---------- facilitator walkthrough: teach a level the room is stuck on, then move on ---------- */
.ls-panel { margin-top: 12px; padding: 12px 16px; border-radius: 10px; border: 1px solid var(--line); background: var(--bg2); opacity: .7; }
.ls-panel.cur { opacity: 1; border-color: var(--cyan); background: var(--cyan-dim); }
.ls-panel p { margin: 6px 0; }
.ls-label { font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin-bottom: 4px; }
.ls-panel.cur .ls-label { color: var(--cyan); }
.ls-q { font-size: 1.15em; font-weight: 600; }
.ls-take { font-weight: 700; }
.ls-example { margin: 8px 0; padding: 12px 14px; border-radius: 10px; background: var(--bg); border: 1px solid var(--line);
  font-family: var(--mono); font-size: 13px; white-space: pre-wrap; overflow-wrap: anywhere; }
.ls-def { background: var(--red-dim); border-color: rgba(248,113,113,.35); color: #fecaca; font-size: 12px; }

/* player screen: replaces the "game paused" card while a walkthrough is open */
.overlay.lesson { align-items: start; overflow: auto; }
.overlay.lesson .ls-card { text-align: left; max-width: 720px; width: 100%; padding: 22px 26px; }
.ls-kicker { font-family: var(--mono); font-size: 12px; letter-spacing: .08em; color: var(--violet); }
.ls-card h2 { margin: 4px 0 0; }
.ls-rail { display: flex; gap: 6px; margin: 14px 0 2px; }
.ls-rail i { flex: 1; height: 6px; border-radius: 3px; background: var(--line); transition: background .3s; }
.ls-rail i.done, .ls-rail i.on { background: var(--cyan); }
.ls-rail i.on { box-shadow: 0 0 0 3px var(--cyan-dim); }
/* pinned to the bottom of the screen, so on a phone the buttons never scroll out of reach */
.ls-pulse { position: sticky; bottom: 0; margin-top: 16px; padding: 14px 0 6px; border-top: 1px solid var(--line); background: var(--panel); }
.overlay.lesson .ls-panel { scroll-margin-bottom: 130px; }
.ls-pulse p { margin: 0 0 8px; }
.ls-pulse .btn.on { outline: 2px solid var(--cyan); outline-offset: 1px; }

/* projector: the scoreboard hands over to the lesson */
.lesson-board { position: fixed; inset: 70px 0 0 0; z-index: 40; background: var(--bg); overflow: hidden;
  padding: 24px clamp(20px, 5vw, 80px) 20px; display: grid; grid-template-rows: auto auto minmax(0, 1fr) auto; gap: 18px; }
.lb-kicker { font-family: var(--mono); letter-spacing: .1em; color: var(--violet); font-size: clamp(13px, 1.3vw, 18px); }
.lesson-board h1 { font-size: clamp(26px, 3.4vw, 52px); }
.lb-rail { display: flex; gap: 10px; flex-wrap: wrap; }
.lb-pill { padding: 6px 14px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); font-size: clamp(13px, 1.3vw, 18px); }
.lb-pill.done { color: var(--text); }
.lb-pill.on { border-color: var(--cyan); background: var(--cyan-dim); color: var(--cyan); font-weight: 700; }
.lb-body { overflow: auto; display: grid; align-content: center; gap: 16px; font-size: clamp(18px, 2.2vw, 34px); line-height: 1.4; }
.lb-body p { margin: 0; }
.lb-body .ls-q { font-size: clamp(24px, 3.2vw, 52px); font-weight: 700; line-height: 1.25; }
.lb-body .ls-take { font-size: clamp(22px, 2.6vw, 40px); }
.lb-body .ls-def { font-size: clamp(13px, 1.4vw, 20px); padding: 4px 14px; }
.lb-body .ls-example { font-size: clamp(16px, 1.9vw, 28px); line-height: 1.45; background: var(--cyan-dim); border-color: var(--cyan); padding: 20px 24px; }
.lb-pulse { display: flex; gap: 28px; align-items: center; flex-wrap: wrap; color: var(--muted); font-size: clamp(16px, 1.8vw, 26px); }
.lb-pulse b { color: var(--text); font-family: var(--mono); }
@media (max-height: 760px) { .lesson-board { inset: 62px 0 0 0; padding-top: 14px; gap: 12px; } }

/* facilitator console */
.walk { border-color: var(--violet); }
.walk-steps { margin: 12px 0; }
.walk-pulse { display: flex; gap: 14px; flex-wrap: wrap; align-items: baseline; margin-top: 4px; }
.pulse-ok { color: var(--green); font-weight: 700; }
.pulse-lost { color: var(--amber); font-weight: 700; }