:root {
  --bg: #f4f6f4; --panel: #ffffff; --ink: #14221a; --dim: #5c6e63; --line: #cfd9d2;
  --accent: #0a7d3c; --accent-ink: #ffffff; --bad: #b3261e; --gold: #a86b00;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b110d; --panel: #111a14; --ink: #d4f5de; --dim: #7fa08b; --line: #24372b;
    --accent: #3ddc84; --accent-ink: #04170b; --bad: #ff6b60; --gold: #ffc247;
  }
}
:root[data-theme="dark"] {
  --bg: #0b110d; --panel: #111a14; --ink: #d4f5de; --dim: #7fa08b; --line: #24372b;
  --accent: #3ddc84; --accent-ink: #04170b; --bad: #ff6b60; --gold: #ffc247;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.5 ui-monospace, "SF Mono", Menlo, Consolas, monospace; }
main { max-width: 860px; margin: 0 auto; padding: 16px; }
h1, h2, h3 { margin: 0; }
code { background: color-mix(in srgb, var(--accent) 12%, transparent); padding: 1px 5px; border-radius: 4px; }
pre { background: #060a07; color: #cdeed8; padding: 12px; border-radius: 8px; overflow-x: auto; }
button, input { font: inherit; color: inherit; }
button { background: var(--accent); color: var(--accent-ink); border: 0; border-radius: 6px; padding: 8px 14px; cursor: pointer; font-weight: 700; }
button.ghost { background: transparent; color: var(--dim); border: 1px solid var(--line); font-weight: 400; padding: 5px 10px; }
button:disabled { opacity: .5; cursor: default; }
input[type=text] { background: var(--bg); border: 1px solid var(--line); border-radius: 6px; padding: 8px 10px; width: 100%; }
input:focus, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.hidden, [hidden] { display: none !important; }
.err { color: var(--bad); min-height: 1.4em; margin: 6px 0 0; }

.login { max-width: 420px; margin: 12vh auto 0; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 24px; display: grid; gap: 12px; }
.login h1 { font-size: 28px; color: var(--accent); }
.login h1::after { content: "_"; animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.sub { color: var(--dim); margin: 0; }

.hud { position: sticky; top: 0; z-index: 5; background: var(--bg); padding: 10px 0 12px; border-bottom: 1px solid var(--line); display: grid; gap: 8px; }
.hud-row { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.score { font-size: 28px; color: var(--accent); font-weight: 800; }
.adv-score { font-size: 16px; color: var(--dim); font-weight: 600; }
.bar { height: 8px; background: var(--line); border-radius: 4px; overflow: hidden; }
.bar > i { display: block; height: 100%; width: 0; background: var(--accent); transition: width .5s; }

.card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 16px; margin: 14px 0; display: grid; gap: 10px; }
.card.done { border-color: var(--accent); }
.card h2 { font-size: 17px; }
.card h2 small { color: var(--dim); font-weight: 400; margin-left: 6px; }
.prompt { margin: 0; color: var(--dim); }
.part { border-top: 1px dashed var(--line); padding-top: 10px; display: grid; gap: 6px; }
.part-head { display: flex; justify-content: space-between; gap: 10px; }
.pts { color: var(--gold); white-space: nowrap; }
.row { display: flex; gap: 8px; }
.opts { display: grid; gap: 6px; }
.opt { text-align: left; background: transparent; color: var(--ink); border: 1px solid var(--line); font-weight: 400; }
.opt:hover:not(:disabled) { border-color: var(--accent); }
.ok { color: var(--accent); font-weight: 700; }
.hint { color: var(--dim); font-size: 13px; }
.shake { animation: shake .35s; }
@keyframes shake { 20%, 60% { transform: translateX(-6px); } 40%, 80% { transform: translateX(6px); } }
.float { position: fixed; pointer-events: none; font-weight: 800; color: var(--gold); font-size: 22px; animation: rise 1.2s ease-out forwards; }
@keyframes rise { to { transform: translateY(-70px); opacity: 0; } }
.toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); background: var(--gold); color: #111; padding: 10px 18px; border-radius: 999px; font-weight: 800; z-index: 20; }

.debrief { background: var(--panel); border: 2px solid var(--accent); border-radius: 12px; padding: 16px; margin: 14px 0; display: grid; gap: 10px; }
.md { line-height: 1.6; }
.md h2 { font-size: 18px; margin: 22px 0 8px; color: var(--accent); }
.md table { border-collapse: collapse; }
.md td, .md th { border: 1px solid var(--line); padding: 4px 8px; }

/* dig console: a column beside the missions on wide screens, a drawer on narrow ones */
select { font: inherit; color: var(--ink); background: var(--bg); border: 1px solid var(--line); border-radius: 6px; padding: 8px 6px; min-width: 0; }
.playing main { max-width: none; padding: 16px clamp(16px, 2vw, 32px); }  /* the whole width: missions and console side by side */
.layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(520px, 1.1fr); gap: 24px; align-items: start; }
.dig { position: sticky; top: 124px; margin: 14px 0; max-height: calc(100vh - 140px); overflow-y: auto; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 14px; display: grid; grid-template-columns: minmax(0, 1fr); gap: 10px; }
.dig-head { display: flex; justify-content: space-between; align-items: center; }
.dig-head h2 { font-size: 19px; color: var(--accent); }
#digClose, .dig-toggle { display: none; }
.dig-form, .dig-out { display: grid; grid-template-columns: minmax(0, 1fr); gap: 8px; }
.dig-row { display: flex; gap: 8px; }
.dig-row select { flex: 1; width: 0; }
.dig-opts { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: 15px; }
.dig-opts label { display: flex; align-items: center; gap: 4px; cursor: pointer; }
.dig-opts input { accent-color: var(--accent); margin: 0; }
.dig-more summary { cursor: pointer; color: var(--dim); font-size: 15px; margin-bottom: 6px; }
.dig-more input + input { margin-top: 6px; }
.dig-form .err { margin: 0; min-height: 0; }
.dig-res summary { display: flex; justify-content: space-between; align-items: center; gap: 8px; cursor: pointer; }
.dig-res summary code { overflow-wrap: anywhere; font-size: 15px; }
.dig-res summary .ghost { font-size: 13px; padding: 2px 8px; }
.dig-res pre { margin: 6px 0 0; font-size: 14px; line-height: 1.5; white-space: pre; }
.dig-res pre .c { color: #7fa08b; }
.dig-res pre .ttl { color: #ffc247; }
.dig-res pre .ty { color: #3ddc84; font-weight: 700; }
.dig-res pre .host { cursor: pointer; text-decoration: underline dotted; text-underline-offset: 3px; }
.dig-res pre .host:hover { color: #fff; }
.stage-title { font-size: 15px; color: var(--dim); margin: 22px 0 4px; text-transform: uppercase; letter-spacing: .04em; }
.stage-title a { color: var(--accent); }
.card.locked { opacity: .55; }
.card.locked h2 { font-weight: 400; }
.dig.locked .dig-form, .dig.locked .dig-out, .dig:not(.locked) .dig-locked { display: none; }
.dig-locked { display: grid; gap: 8px; }
.dig-locked p { margin: 0; }
.dig-locked pre { margin: 0; }
.warmup .dig-toggle { display: none !important; }
@media (max-width: 1099px) {
  .layout { display: block; }
  .dig { position: fixed; z-index: 10; left: 0; right: 0; bottom: 0; top: auto; margin: 0; height: 78vh; max-height: none; border-radius: 14px 14px 0 0; box-shadow: 0 -8px 30px rgb(0 0 0 / 25%); transform: translateY(105%); transition: transform .25s; }
  .dig.open { transform: none; }
  #digClose { display: inline-block; }
  .dig-toggle { display: block; position: fixed; z-index: 9; right: 16px; bottom: 16px; padding: 12px 18px; border-radius: 999px; box-shadow: 0 4px 14px rgb(0 0 0 / 25%); }
}

/* leaderboard */
.board main { max-width: 1240px; }
.board h1 { font-size: clamp(28px, 5vw, 54px); color: var(--accent); }
.join { float: right; width: clamp(140px, 18vw, 220px); margin: 0 0 12px 18px; padding: 10px; background: #fff; border-radius: 12px; text-align: center; }
.join svg { display: block; width: 100%; height: auto; }
.join span { display: block; margin-top: 6px; font-size: 12px; color: #111; overflow-wrap: anywhere; }
.rows { display: grid; gap: 8px; margin-top: 18px; }
.boards { display: grid; gap: 24px; align-items: start; }
.boards.two { grid-template-columns: 3fr 2fr; }
.adv-title { margin: 18px 0 0; font-size: clamp(18px, 2.4vw, 28px); color: var(--gold); }
@media (max-width: 760px) { .boards.two { grid-template-columns: 1fr; } }
.lrow { display: grid; grid-template-columns: 3em 1fr 6em; gap: 12px; align-items: center; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 10px 14px; font-size: clamp(16px, 2.4vw, 26px); transition: transform .4s; }
.lrow .rank { color: var(--dim); }
.lrow:nth-child(1) .rank { color: var(--gold); }
.lrow .name { display: grid; gap: 4px; }
.lrow .bar { height: 6px; }
.lrow .sc { text-align: right; color: var(--accent); font-weight: 800; }
.lrow.flash { animation: flash 1.2s; }
@keyframes flash { from { background: color-mix(in srgb, var(--accent) 35%, var(--panel)); } }
.bloods { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.chip { border: 1px solid var(--gold); color: var(--gold); border-radius: 999px; padding: 3px 12px; font-size: 14px; }
.boards.three { grid-template-columns: 2fr 1fr 1fr; }
@media (max-width: 760px) { .boards.three { grid-template-columns: 1fr; } }

/* live quiz: the player's card */
/* the question covers the whole screen until the teacher closes it */
.quiz { position: fixed; inset: 0; z-index: 50; overflow-y: auto; background: var(--bg); padding: max(20px, 4vh) max(16px, 6vw);
  display: flex; flex-direction: column; gap: 16px; font-size: clamp(16px, 2.2vw, 22px); }
.quiz > * { width: 100%; max-width: 860px; margin-left: auto; margin-right: auto; }
.quiz-top { display: flex; justify-content: space-between; color: var(--gold); font-weight: 800; text-transform: uppercase; letter-spacing: .08em; }
.quiz-q { font-size: clamp(22px, 4.5vw, 40px); line-height: 1.25; }
.quiz .opt { padding: 14px 16px; font-size: inherit; }
.quiz .opts { gap: 10px; }
.quiz input[type=text] { font-size: inherit; padding: 12px; }
body.quiz-on { overflow: hidden; }
body.quiz-on .dig-toggle, body.quiz-on .dig.open { display: none; }
body.lab-paused .dig, body.lab-paused .dig-toggle { display: none !important; }
.waiting { text-align: center; padding: 40px 16px; border-style: dashed; }
.waiting h2 { font-size: 24px; color: var(--gold); }
.paused { color: var(--gold); font-weight: 700; font-size: clamp(16px, 2vw, 24px); margin: 6px 0 0; }
.qmulti { display: grid; gap: 8px; }
.qmulti label { font-size: inherit; display: flex; gap: 8px; align-items: center; border: 1px solid var(--line); border-radius: 6px; padding: 8px 10px; cursor: pointer; }
.qmulti button { justify-self: start; }
.bad { color: var(--bad); font-weight: 700; }
.explain { margin: 0; padding: 8px 12px; border-left: 3px solid var(--gold); background: color-mix(in srgb, var(--gold) 8%, transparent); }
.qbars { display: grid; gap: 6px; }
.qbar { position: relative; display: grid; grid-template-columns: 1fr 3em; align-items: center; gap: 8px; padding: 6px 10px; border: 1px solid var(--line); border-radius: 6px; overflow: hidden; }
.qbar i { position: absolute; inset: 0 auto 0 0; background: color-mix(in srgb, var(--dim) 18%, transparent); z-index: 0; transition: width .5s; }
.qbar.right { border-color: var(--accent); }
.qbar.right i { background: color-mix(in srgb, var(--accent) 28%, transparent); }
.qbar span, .qbar b { position: relative; z-index: 1; }
.qbar b { text-align: right; }
.wall { display: grid; gap: 6px; }
.wall-row { display: flex; justify-content: space-between; align-items: center; gap: 10px; padding: 6px 10px; border: 1px solid var(--line); border-radius: 6px; overflow-wrap: anywhere; }
.wall-row button.voted { color: var(--accent); border-color: var(--accent); }

/* live quiz: the projector */
.present { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; padding: 10px; margin-bottom: 18px; border: 1px dashed var(--gold); border-radius: 10px; font-size: 14px; }
.present select { font: inherit; color: inherit; background: var(--panel); border: 1px solid var(--line); border-radius: 6px; padding: 6px; }
.present .err { margin: 0; }
.present-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.qlist { display: flex; flex-wrap: wrap; gap: 4px; }
.qlist button { min-width: 2.4em; padding: 4px 8px; }
.qlist button.live { color: var(--accent-ink); background: var(--accent); border-color: var(--accent); }
/* while a question is live: the question, and the quiz ranking in a side column */
.quizview { display: grid; grid-template-columns: minmax(0, 1fr) 260px; gap: 28px; align-items: start; }
.qmain { display: grid; gap: 18px; }
.qside { position: sticky; top: 16px; display: grid; gap: 6px; padding: 14px; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; }
.qside h2 { color: var(--gold); font-size: clamp(18px, 2vw, 24px); margin-bottom: 4px; }
.srow { display: grid; grid-template-columns: 2.4em 1fr auto; gap: 8px; align-items: baseline; font-size: clamp(14px, 1.5vw, 19px); }
.srow .rank { color: var(--dim); }
.srow:first-of-type .rank { color: var(--gold); }
.srow b { color: var(--accent); }
.sjoin { margin: 10px 0 0; padding-top: 8px; border-top: 1px dashed var(--line); color: var(--dim); font-size: 14px; }
@media (max-width: 900px) { .quizview { grid-template-columns: 1fr; } }
.qmeta { display: flex; justify-content: space-between; color: var(--dim); font-size: clamp(16px, 2vw, 24px); margin: 0; }
#qClock { color: var(--gold); font-weight: 700; }
.board .qtext { font-size: clamp(26px, 4.2vw, 52px); color: var(--ink); line-height: 1.2; }
.qopts { display: grid; gap: 10px; margin: 0; padding-left: 1.6em; font-size: clamp(20px, 3vw, 36px); }
.qbars.big .qbar, .wall.big .wall-row { font-size: clamp(18px, 2.6vw, 32px); padding: 10px 16px; }
.board .explain { font-size: clamp(16px, 2vw, 24px); }
/* many options (e.g. 20 features to tick): two columns where there is room */
.qopts.many { display: block; columns: 2; column-gap: 40px; }
.qopts.many li { break-inside: avoid; margin-bottom: 6px; }
.qbars.many, .qmulti.many { grid-template-columns: 1fr 1fr; }
.qmulti.many button { grid-column: 1 / -1; }
.board .qopts.many { font-size: clamp(16px, 2vw, 26px); }
.qbars.big.many { gap: 6px 14px; }
.qbars.big.many .qbar { font-size: clamp(14px, 1.6vw, 20px); padding: 5px 12px; }
@media (max-width: 640px) { .qbars.many, .qmulti.many { grid-template-columns: 1fr; } .qopts.many { columns: 1; } }

/* admin page */
.admin main { max-width: 1100px; }
.admin-head { margin-bottom: 8px; }
.admin-head h1 { font-size: 26px; color: var(--accent); }
.admin-links { margin: 4px 0; }
.admin a { color: var(--accent); }
.admin-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 18px; align-items: start; }
.admin-grid .quiz-admin { grid-column: 1 / -1; }
@media (max-width: 760px) { .admin-grid { grid-template-columns: 1fr; } }
.switch { display: flex; gap: 10px; align-items: center; padding: 8px 0; cursor: pointer; }
.switch input { width: 20px; height: 20px; accent-color: var(--accent); }
.switch em { margin-left: auto; font-style: normal; color: var(--dim); }
.qpreview { display: grid; gap: 10px; border-top: 1px dashed var(--line); padding-top: 12px; }
.qpreview h3 { font-size: 20px; }
.qopts.small { font-size: 17px; gap: 4px; }
/* the projector, live and scaled down, beside the quiz controls */
.quiz-split { display: grid; grid-template-columns: minmax(0, 1fr) 480px; gap: 18px; align-items: start; }
.boardprev { margin: 0; display: grid; gap: 6px; }
.boardprev .frame { width: 480px; height: 270px; overflow: hidden; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); }
.boardprev iframe { width: 1280px; height: 720px; border: 0; transform: scale(.375); transform-origin: 0 0; pointer-events: none; }
@media (max-width: 1000px) { .quiz-split { grid-template-columns: 1fr; } }
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }