:root {
  --fog: #EEF1F6;
  --paper: #FFFFFF;
  --ink: #1D2330;
  --muted: #5E6779;
  --line: #D5DBE6;
  --synapse: #5B3FD6;      /* the answer */
  --synapse-soft: #E7E2FB;
  --held: #D98A1E;         /* a pause that counts */
  --held-soft: #FBEBD3;
  --danger: #B3261E;
  --display: "Bricolage Grotesque", system-ui, sans-serif;
  --body: "Atkinson Hyperlegible", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --fog: #141821; --paper: #1C2130; --ink: #E8ECF4; --muted: #9AA3B5; --line: #2E3547;
    --synapse: #9C88FF; --synapse-soft: #2A2450; --held: #F0A841; --held-soft: #3A2D16; --danger: #FF8A80;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--fog); color: var(--ink);
  font: 17px/1.5 var(--body);
  padding-bottom: env(safe-area-inset-bottom);
}
button { font: inherit; color: inherit; cursor: pointer; }
:focus-visible { outline: 3px solid var(--synapse); outline-offset: 2px; border-radius: 6px; }
.mono { font-family: var(--mono); }
.small { font-size: 13px; color: var(--muted); }
h2 { font: 800 26px/1.15 var(--display); margin: 8px 0 4px; letter-spacing: -0.01em; }
h3 { font: 800 18px/1.2 var(--display); margin: 28px 0 8px; }
.sub { color: var(--muted); margin: 0 0 16px; }

/* header */
.top {
  position: sticky; top: 0; z-index: 5; background: color-mix(in srgb, var(--fog) 90%, transparent);
  backdrop-filter: blur(8px); padding: 12px 16px 0; border-bottom: 1px solid var(--line);
}
.wordmark { font: 800 26px/1 var(--display); margin: 0 0 8px; letter-spacing: -0.02em; }
.wordmark span { color: var(--synapse); }
.tabs { display: flex; gap: 4px; overflow-x: auto; }
.tabs button {
  background: none; border: 0; padding: 8px 10px 10px; color: var(--muted);
  border-bottom: 3px solid transparent; font-weight: 700; white-space: nowrap;
}
.tabs button[aria-current="page"] { color: var(--ink); border-bottom-color: var(--synapse); }

main { max-width: 640px; margin: 0 auto; padding: 16px; }
.screen[hidden] { display: none; }
.brainline { margin: 0 0 12px; color: var(--muted); font-size: 15px; }
.accent { border: 0; padding: 0; margin: 0 0 12px; display: flex; flex-wrap: wrap; align-items: center; gap: 6px 8px; }
.accent legend { float: left; font-size: 15px; color: var(--muted); margin-right: 4px; padding: 0; }
.accent label { display: inline-flex; align-items: center; gap: 6px; padding: 6px 12px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--paper); font-size: 15px; cursor: pointer; }
.accent input { accent-color: var(--synapse); margin: 0; }
.accent label:has(input:checked) { border-color: var(--synapse); color: var(--synapse); font-weight: 700; }
.accent input:disabled + * , .accent label:has(input:disabled) { opacity: .5; cursor: not-allowed; }
.link { background: none; border: 0; padding: 0; color: var(--synapse); text-decoration: underline; text-underline-offset: 3px; }

/* stage: the sentence and the blank you can't fill */
.stage {
  background: var(--paper); border: 1px solid var(--line); border-radius: 18px;
  padding: 20px 18px; min-height: 220px; display: flex; align-items: flex-end;
}
.transcript {
  margin: 0; font: 500 clamp(24px, 6.4vw, 34px)/1.3 var(--display); letter-spacing: -0.01em;
  overflow-wrap: anywhere;
}
.transcript .placeholder { color: var(--muted); font: 400 18px/1.5 var(--body); letter-spacing: 0; }
.transcript .w { transition: color .6s; }
.transcript .w.old { color: var(--muted); }
.transcript .w.filler { color: var(--held); font-style: italic; }
.transcript .w.fixed { text-decoration: underline dotted var(--synapse); text-underline-offset: .2em; }

/* the gap: grows with your silence, turns amber when it counts, and the answer drops in */
.gap {
  display: inline-block; position: relative; vertical-align: baseline;
  width: 0; height: 1.1em; margin-left: .25em; border-bottom: 3px solid var(--line);
  transition: width .1s linear, border-color .2s;
}
.gap.visible { width: calc(var(--p, 0) * 7em + .6em); }
.gap.armed { border-bottom-color: var(--held); }
.gap-fill { position: absolute; inset: auto 0 -3px 0; height: 3px; background: var(--held); transform-origin: left; transform: scaleX(0); }
.gap.armed .gap-fill { transform: scaleX(var(--f, 0)); }
.gap.found { width: auto; border-bottom-color: var(--synapse); padding: 0 .1em; margin-right: .3em; }
.gap-answer { color: var(--synapse); font-weight: 800; white-space: nowrap; }
.gap.found .gap-answer { animation: drop .35s cubic-bezier(.2, 1.4, .4, 1) both; }
@keyframes drop { from { opacity: 0; transform: translateY(-.6em); } to { opacity: 1; transform: none; } }

/* meter */
.meter { margin: 14px 2px 0; }
.meter-track { position: relative; height: 6px; background: var(--line); border-radius: 3px; overflow: hidden; }
.meter-bar { position: absolute; inset: 0 auto 0 0; width: 0; background: var(--muted); transition: width .1s linear; }
.meter.armed .meter-bar { background: var(--held); }
.meter-mark { position: absolute; top: -2px; bottom: -2px; width: 2px; background: var(--ink); left: 40%; }
.meter-read { font-size: 12px; color: var(--muted); margin-top: 6px; }

/* answer card */
.answer {
  margin-top: 16px; background: var(--synapse-soft); border-radius: 18px; padding: 16px 18px;
  border: 1px solid color-mix(in srgb, var(--synapse) 30%, transparent);
  animation: rise .3s ease-out both;
}
.answer[hidden] { display: none; }
@keyframes rise { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.answer-kicker { font-size: 12px; margin: 0; color: var(--muted); }
.answer-text { font: 800 30px/1.15 var(--display); margin: 4px 0; color: var(--synapse); }
.answer-source { margin: 0; color: var(--ink); font-size: 15px; }
.answer-actions { display: flex; gap: 8px; margin-top: 10px; }
.answer-more { font-size: 15px; color: var(--muted); margin: 10px 0 0; }

/* controls */
.controls { display: grid; grid-template-columns: 1fr auto; gap: 10px; margin-top: 18px; }
.primary, .stuck, .ghost, .danger {
  border-radius: 999px; padding: 14px 20px; font-weight: 700; border: 2px solid transparent;
}
.primary { background: var(--ink); color: var(--fog); }
.primary.on { background: var(--danger); color: #fff; }
.stuck { background: var(--paper); border-color: var(--held); color: var(--ink); }
.stuck:disabled { opacity: .45; cursor: not-allowed; }
.ghost { background: transparent; border-color: currentColor; padding: 8px 16px; font-size: 15px; }
.danger { background: transparent; border-color: var(--danger); color: var(--danger); }
.hint { font-size: 14px; color: var(--muted); margin: 10px 2px 0; }

/* samples */
.samples { margin-top: 32px; padding-top: 8px; border-top: 1px solid var(--line); }
.samples h2 { font-size: 20px; }
#samples { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.sample {
  width: 100%; text-align: left; background: var(--paper); border: 1px solid var(--line); border-radius: 14px;
  padding: 12px 14px; display: grid; gap: 2px;
}
.sample strong { font-family: var(--display); font-size: 17px; }
.sample span { color: var(--muted); font-size: 14px; }
.sample.playing { border-color: var(--synapse); }

/* moments */
.moment-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.moment { background: var(--paper); border: 1px solid var(--line); border-radius: 14px; padding: 12px 14px; }
.moment q { color: var(--muted); quotes: "…" "…"; }
.moment .ans { font: 800 20px/1.2 var(--display); color: var(--synapse); margin: 4px 0; }
.moment .ans.none { color: var(--muted); font-weight: 500; font-size: 16px; }
.moment .meta { font-family: var(--mono); font-size: 12px; color: var(--muted); display: flex; flex-wrap: wrap; gap: 4px 12px; }
.empty { color: var(--muted); }

/* brain */
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin: 0 0 8px; }
.stats div { background: var(--paper); border: 1px solid var(--line); border-radius: 12px; padding: 10px; }
.stats dt { font-size: 12px; color: var(--muted); }
.stats dd { margin: 0; font: 800 22px/1.1 var(--display); }
.card { background: var(--paper); border: 1px solid var(--line); border-radius: 16px; padding: 4px 16px 16px; margin-top: 16px; }
.card p { margin: 0 0 12px; }
.file input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.file span { display: inline-block; border: 2px solid var(--ink); border-radius: 999px; padding: 8px 16px; font-weight: 700; cursor: pointer; }
.file input:focus-visible + span { outline: 3px solid var(--synapse); outline-offset: 2px; }
.row { display: flex; gap: 8px; }
.row input { flex: 1; min-width: 0; font: inherit; padding: 8px 12px; border-radius: 10px; border: 1px solid var(--line); background: var(--fog); color: var(--ink); }
.docs { list-style: none; padding: 0; margin: 0; display: grid; gap: 4px; }
.docs li { display: flex; justify-content: space-between; gap: 12px; padding: 8px 0; border-bottom: 1px solid var(--line); font-size: 15px; }
.docs li span:last-child { color: var(--muted); font-family: var(--mono); font-size: 12px; white-space: nowrap; }

/* privacy */
.rules { padding-left: 20px; }
.rules li { margin-bottom: 10px; }

.toast {
  position: fixed; left: 50%; bottom: calc(16px + env(safe-area-inset-bottom)); transform: translateX(-50%);
  background: var(--ink); color: var(--fog); padding: 10px 16px; border-radius: 12px; font-size: 15px;
  max-width: calc(100% - 32px);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}