* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #14161a;
  --panel: #1e2127;
  --text: #e8eaed;
  --dim: #9aa0a8;
  --accent: #4c8dff;
  --ok: #35c46f;
}
html, body { height: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
.hidden { display: none !important; }
.screen { min-height: 100vh; display: flex; flex-direction: column; align-items: center;
          justify-content: center; padding: 24px; gap: 20px; }
h1 { font-size: 1.6rem; font-weight: 650; text-align: center; }
.card { background: var(--panel); border-radius: 14px; padding: 28px 32px; max-width: 620px;
        display: flex; flex-direction: column; gap: 14px; }
.card ul { padding-left: 20px; display: flex; flex-direction: column; gap: 6px; }
.fineprint { color: var(--dim); font-size: 0.85rem; }
.nick { display: flex; flex-direction: column; gap: 6px; font-size: 0.9rem; color: var(--dim); }
.nick input { background: var(--bg); border: 1px solid #333842; border-radius: 8px;
              color: var(--text); padding: 10px 12px; font-size: 1rem; }
button.primary {
  background: var(--accent); color: #fff; border: 0; border-radius: 10px;
  padding: 13px 22px; font-size: 1.05rem; font-weight: 600; cursor: pointer;
}
button.primary:hover { filter: brightness(1.1); }
.error { color: #ff7b72; }

/* trial screen */
#screen-trial { justify-content: flex-start; gap: 11px; padding-top: 12px; position: relative; }
.trialbar { width: min(96vw, 1200px); display: flex; align-items: center; gap: 14px;
            color: var(--dim); font-size: 0.9rem; }
.trialbar progress { flex: 1; height: 6px; accent-color: var(--accent); }
figure { display: flex; flex-direction: column; align-items: center; gap: 6px; }
figcaption { color: var(--dim); font-size: 0.9rem; letter-spacing: 0.04em;
             text-transform: uppercase; }
video { background: #000; border-radius: 10px; width: 100%; height: auto; display: block; }
.ref-row { width: min(52vw, 620px); }
.ref-row figure { width: 100%; }
.ab-row { display: flex; gap: 22px; width: min(96vw, 1200px); justify-content: center; }
.choice { flex: 1; max-width: 585px; }
.choice video { cursor: pointer; border: 2px solid transparent; }
.choice video:hover { border-color: var(--accent); }
button.pick {
  width: 100%; background: var(--panel); color: var(--text); border: 1px solid #333842;
  border-radius: 10px; padding: 12px; font-size: 1rem; font-weight: 600; cursor: pointer;
}
button.pick:hover { background: var(--accent); border-color: var(--accent); }
button.pick:disabled { opacity: 0.4; cursor: default; }
kbd { background: #2a2e36; border-radius: 4px; padding: 1px 7px; font-size: 0.85em;
      border: 1px solid #3a3f49; }
.veil { position: absolute; inset: 0; background: rgba(20,22,26,0.85); display: flex;
        align-items: center; justify-content: center; color: var(--dim); font-size: 1.1rem;
        border-radius: 0; z-index: 5; }
.flash-ok { animation: flash 0.25s; }
@keyframes flash { 0% { outline: 3px solid var(--ok); } 100% { outline: 0 solid transparent; } }

.tie-row { width: min(96vw, 1200px); display: flex; justify-content: center; }
.tie-row .pick { max-width: 380px; padding: 8px 12px; font-size: 0.9rem; color: var(--dim); }
button.pick.tie:hover { background: #6a6f7a; border-color: #6a6f7a; }

#toast {
  position: fixed; bottom: 18px; left: 50%; transform: translate(-50%, 80px);
  background: #3a2f13; color: #ffd479; border: 1px solid #6b5518; border-radius: 10px;
  padding: 10px 18px; font-size: 0.95rem; transition: transform 0.25s; z-index: 20;
}
#toast.show { transform: translate(-50%, 0); }

/* keep the whole trial on screen on short windows: videos give up height first */
.ref-row video { max-height: 34vh; width: auto; max-width: 100%; margin: 0 auto; }
.choice video { max-height: 38vh; width: auto; max-width: 100%; margin: 0 auto; }

@media (max-width: 760px) {
  .ab-row { flex-direction: column; align-items: center; }
  .choice { width: 92vw; max-width: none; }
  .ref-row { width: 92vw; }
}