@import url('https://fonts.googleapis.com/css2?family=Courier+Prime:ital,wght@0,400;0,700;1,400&family=Special+Elite&display=swap');

/* Noir case file: ink-black desk, paper-white type, one lamp-brass accent,
   red only for stamps and mistakes. All text pairs stay above WCAG AA. */
:root {
  --accent: #e3b25a;   /* desk-lamp brass: links, inputs, progress */
  --muted: #a39a88;    /* labels and secondary text */
  --text: #ece6d8;     /* aged paper */
  --dark: #0e0d0b;
  --panel: #171512;
  --border: #33302a;
  --red: #e5604f;
  --paper: #f4efe3;    /* senior badge, hints */
  --lamp: 0 0 14px rgba(227, 178, 90, .22);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--dark);
  color: var(--text);
  font-family: 'Courier Prime', 'Courier New', monospace;
  font-size: 18px;
  line-height: 1.65;
  min-height: 100vh;
  padding: 48px 16px 80px;
}

/* A pool of lamplight on the desk, falling off into shadow at the edges. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 50;
  background:
    radial-gradient(ellipse 70% 55% at 50% 0%, rgba(227, 178, 90, .06), transparent 70%),
    radial-gradient(ellipse at center, transparent 60%, rgba(0, 0, 0, .5) 100%);
}

main { max-width: 760px; margin: 0 auto; }

/* ── Header ─────────────────────────────────────────── */
.badge {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .3em;
  color: var(--dark);
  background: var(--accent);
  padding: 3px 12px;
}
.badge.senior { background: var(--paper); }

h1 {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-weight: 400;
  font-size: clamp(40px, 8vw, 64px);
  line-height: 1.05;
  color: var(--text);
  margin: 18px 0 8px;
}
.case-line { color: var(--muted); letter-spacing: .12em; font-size: 14px; }
.intro { margin: 22px 0 28px; max-width: 62ch; }
.intro a { color: var(--accent); }

/* ── Progress ───────────────────────────────────────── */
.progress { margin-bottom: 28px; }
.progress-label { display: flex; justify-content: space-between; font-size: 13px; letter-spacing: .2em; color: var(--muted); margin-bottom: 6px; }
.progress-track { height: 6px; background: var(--panel); border: 1px solid var(--border); overflow: hidden; }
.progress-fill {
  height: 100%;
  width: 0;
  background: var(--accent);
  transition: width .9s cubic-bezier(.2, .8, .2, 1);
}

/* ── Question cards ─────────────────────────────────── */
.card {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 20px 22px;
  margin-bottom: 16px;
  overflow: hidden;
}
.card.entering { animation: enter .7s cubic-bezier(.2, .8, .2, 1) both; }
.card.entering::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, transparent 30%, rgba(236, 230, 216, .08) 50%, transparent 70%);
  transform: translateX(-100%);
  animation: sweep 1.1s .2s ease-out forwards;
  pointer-events: none;
}
.card.solved { border-color: #5a4a2c; animation: solvedGlow 1.6s ease-out forwards; }
.card.wrong { animation: shake .45s, wrongGlow .9s; }

.q-num { font-size: 13px; letter-spacing: .25em; color: var(--muted); margin-bottom: 6px; display: flex; justify-content: space-between; align-items: center; }
/* Rubber stamp. */
.q-stamp {
  color: var(--red);
  border: 2px solid currentColor;
  padding: 0 8px;
  font-family: 'Special Elite', 'Courier New', monospace;
  letter-spacing: .15em;
  opacity: 0;
  transform: scale(1.8) rotate(-4deg);
}
.card.solved .q-stamp { animation: stamp .45s .15s cubic-bezier(.2, 1.4, .4, 1) forwards; }
.card.solved.instant .q-stamp { animation: none; opacity: 1; transform: rotate(-4deg); }
.card.solved.instant { animation: none; box-shadow: var(--lamp); }

.q-text { font-size: 19px; color: var(--text); min-height: 1.6em; }
.q-text .caret { color: var(--accent); animation: blink 1s steps(1) infinite; }

.answer-row { display: flex; gap: 10px; margin-top: 14px; flex-wrap: wrap; }
.answer-row input {
  flex: 1 1 240px;
  min-width: 0;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--muted);
  color: var(--text);
  font: inherit;
  font-size: 19px;
  padding: 6px 2px;
  outline: none;
  caret-color: var(--accent);
}
.answer-row input:focus { border-bottom-color: var(--accent); }
.answer-row input:disabled { color: var(--accent); border-bottom-color: transparent; }
.answer-row input::placeholder, .log-row input::placeholder { color: var(--muted); opacity: 1; }

button {
  font: inherit;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .12em;
  cursor: pointer;
  border: 1px solid var(--accent);
  background: transparent;
  color: var(--accent);
  padding: 8px 16px;
  transition: background .2s, color .2s;
}
button:hover:not(:disabled) { background: var(--accent); color: var(--dark); }
button:focus-visible, a:focus-visible, input:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
button:disabled { opacity: .45; cursor: default; }
button.link { border: none; padding: 0; font-size: 14px; font-weight: 400; color: var(--muted); text-decoration: underline; }
button.link:hover:not(:disabled) { background: none; color: var(--text); }

.hint-row { margin-top: 12px; }
.hint { display: none; margin-top: 8px; color: var(--paper); font-style: italic; font-size: 16px; border-left: 2px solid var(--accent); padding-left: 12px; }
.hint.show { display: block; animation: enter .4s ease-out both; }

.msg { min-height: 1.4em; margin-top: 8px; font-size: 15px; color: var(--red); }
.card.solved .msg, .card.solved .hint-row:not(:has(.hint.show)) { display: none; }

/* ── Solved banner and leaderboard entry ───────────── */
.solved-box {
  display: none;
  text-align: center;
  border: 1px solid var(--border);
  background: var(--panel);
  padding: 32px 20px;
  margin: 28px 0;
}
.solved-box.show { display: block; animation: enter .6s ease-out both, solvedGlow 2.4s .3s ease-out forwards; }
.solved-title {
  display: inline-block;
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: clamp(44px, 10vw, 76px);
  line-height: 1;
  color: var(--red);
  border: 4px solid currentColor;
  padding: 6px 22px;
  transform: rotate(-3deg);
  animation: stampBig .7s .2s cubic-bezier(.2, 1.4, .4, 1) both;
}
.solved-sub { margin: 18px 0 22px; }
.log-row { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.log-row input {
  flex: 0 1 280px;
  min-width: 0;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--muted);
  color: var(--text);
  font: inherit;
  font-size: 19px;
  padding: 6px 2px;
  outline: none;
  text-align: center;
}
.log-row input:focus { border-bottom-color: var(--accent); }
.log-row[hidden] { display: none; }
.log-status { min-height: 1.4em; margin-top: 10px; font-size: 15px; color: var(--accent); }

.board { margin-top: 44px; }
.board h2 { font-family: 'Special Elite', 'Courier New', monospace; font-weight: 400; font-size: 32px; color: var(--text); }
.board table { width: 100%; border-collapse: collapse; margin-top: 10px; font-size: 16px; }
.board th { text-align: left; font-weight: 400; font-size: 12px; letter-spacing: .2em; color: var(--muted); border-bottom: 1px solid var(--border); padding: 6px 8px; }
.board td { padding: 8px; border-bottom: 1px solid var(--border); overflow-wrap: anywhere; }
.board tr.first td { color: var(--accent); }
.board tr.fresh td { animation: rowFlash 2.4s ease-out; }
.rank-tag { font-size: 11px; letter-spacing: .15em; padding: 1px 6px; border: 1px solid currentColor; }
.rank-tag.junior { color: var(--accent); }
.rank-tag.senior { color: var(--paper); }
.board .empty { text-align: center; color: var(--muted); padding: 18px; }

footer { margin-top: 48px; font-size: 14px; color: var(--muted); text-align: center; }
footer a { color: var(--muted); }

/* ── Animations ─────────────────────────────────────── */
@keyframes enter { from { opacity: 0; transform: translateY(14px); filter: blur(3px); } to { opacity: 1; transform: none; filter: none; } }
@keyframes sweep { to { transform: translateX(100%); } }
@keyframes solvedGlow {
  0% { box-shadow: 0 0 0 rgba(227, 178, 90, 0); }
  25% { box-shadow: 0 0 30px rgba(227, 178, 90, .4), inset 0 0 18px rgba(227, 178, 90, .12); border-color: var(--accent); }
  100% { box-shadow: var(--lamp); }
}
@keyframes wrongGlow { 0%, 100% { box-shadow: none; } 30% { box-shadow: 0 0 22px rgba(229, 96, 79, .45); border-color: var(--red); } }
@keyframes shake { 0%, 100% { transform: none; } 20% { transform: translateX(-8px); } 40% { transform: translateX(7px); } 60% { transform: translateX(-5px); } 80% { transform: translateX(3px); } }
@keyframes stamp { to { opacity: 1; transform: rotate(-4deg); } }
@keyframes stampBig { from { opacity: 0; transform: scale(2.2) rotate(-10deg); } to { opacity: 1; transform: rotate(-3deg); } }
@keyframes blink { 50% { opacity: 0; } }
@keyframes rowFlash { 0% { background: rgba(227, 178, 90, .2); } 100% { background: transparent; } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .q-stamp { opacity: 1; transform: rotate(-4deg); }
}