/* ============================================================
   Exposure Lock — Year 10 Media · Do Now
   Steel-blue Unit 1 palette (EXPOSURE) with warm gold accent.
   ============================================================ */

:root {
  --bg:           #0a1420;
  --bg-2:         #0f1d2e;
  --bg-3:         #16263b;
  --bg-4:         #1f3550;
  --ink:          #e7ecf2;
  --ink-dim:      #92a3b8;
  --ink-mute:     #5d6c7e;
  --rule:         #1f3550;
  --steel:        #1A6B9A;   /* Unit 1 EXPOSURE colour */
  --steel-2:      #2588c0;
  --gold:         #f5b85a;
  --gold-2:       #ffc977;
  --ok:           #6ccb7f;
  --bad:          #d05a5a;
  --aperture:     #5fbfd2;
  --shutter:      #f5a76b;
  --iso:          #c789e2;
  --balance:      #f5b85a;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --r-sm: 4px;
  --r-md: 10px;
  --r-lg: 16px;
  --r-pill: 999px;
}

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

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background:
    radial-gradient(circle at 20% -10%, rgba(26,107,154,0.32), transparent 50%),
    radial-gradient(circle at 90% 110%, rgba(245,184,90,0.12), transparent 50%),
    var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
}

.hidden { display: none !important; }

h1 {
  font-size: 44px;
  font-weight: 800;
  margin: 0 0 12px;
  color: #fff;
  letter-spacing: -0.02em;
  line-height: 1.05;
}
h3 {
  font-size: 13px;
  font-weight: 700;
  margin: 0 0 12px;
  color: var(--gold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.eyebrow {
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
  font-weight: 700;
  margin: 0 0 12px;
}

kbd {
  font-family: var(--font);
  font-size: 12px;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: var(--r-sm);
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  color: var(--ink);
}

/* ============== INTRO ============== */
.intro {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 560px;
}

.intro-content {
  background: linear-gradient(180deg, rgba(22,38,59,0.85), rgba(10,20,32,0.95));
  border: 1px solid rgba(26,107,154,0.5);
  border-radius: var(--r-lg);
  padding: 32px 36px;
  box-shadow: 0 24px 56px rgba(0,0,0,0.4);
  width: 100%;
}

.lede {
  font-size: 16px;
  color: var(--ink);
  margin: 0 0 18px;
}

.rules {
  list-style: none;
  margin: 8px 0 22px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.rules li {
  font-size: 14px;
  color: var(--ink);
  display: flex;
  align-items: flex-start;
  gap: 12px;
}
.rules .dot {
  display: inline-block;
  width: 9px; height: 9px;
  border-radius: 50%;
  margin-top: 7px;
  flex-shrink: 0;
}
.rules .dot.ok     { background: var(--ok); box-shadow: 0 0 0 2px rgba(108,203,127,0.25); }
.rules .dot.bad    { background: var(--bad); box-shadow: 0 0 0 2px rgba(208,90,90,0.25); }
.rules .dot.time   { background: var(--gold); box-shadow: 0 0 0 2px rgba(245,184,90,0.25); }
.rules .dot.streak { background: linear-gradient(135deg, var(--gold), var(--shutter)); box-shadow: 0 0 0 2px rgba(245,167,107,0.25); }
.rules strong { color: var(--gold); font-weight: 700; }

.name-row {
  display: flex;
  gap: 10px;
  margin-top: 8px;
}

#name-input {
  flex: 1;
  background: rgba(255,255,255,0.06);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: var(--r-md);
  padding: 12px 14px;
  font-family: var(--font);
  font-size: 15px;
  outline: none;
  transition: border-color 0.15s ease, background 0.15s ease;
}
#name-input::placeholder { color: rgba(231,236,242,0.4); }
#name-input:focus {
  border-color: var(--steel-2);
  background: rgba(255,255,255,0.1);
}

.big-btn {
  background: linear-gradient(180deg, var(--gold-2), var(--gold));
  color: #1a1208;
  border: 0;
  border-radius: var(--r-md);
  font-family: var(--font);
  font-weight: 700;
  font-size: 15px;
  padding: 12px 26px;
  cursor: pointer;
  letter-spacing: 0.02em;
  box-shadow: 0 6px 14px rgba(0,0,0,0.3);
  transition: transform 0.1s ease, box-shadow 0.1s ease;
}
.big-btn:hover  { transform: translateY(-1px); box-shadow: 0 10px 20px rgba(0,0,0,0.35); }
.big-btn:active { transform: translateY(0); }

.hint-text {
  margin: 12px 0 0;
  font-size: 12px;
  color: var(--ink-mute);
}

/* ============== GAME ============== */
.game {
  width: 100%;
  max-width: 720px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.hud {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: 1px;
  background: rgba(26,107,154,0.3);
  border: 1px solid rgba(26,107,154,0.3);
  border-radius: var(--r-md);
  overflow: hidden;
}
.hud-cell {
  background: rgba(15,29,46,0.85);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 8px 8px;
  gap: 2px;
}
.hud-label {
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  font-weight: 700;
}
.hud-value {
  font-size: 22px;
  font-weight: 800;
  color: #fff;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}
.hud-mult {
  font-size: 22px;
  font-weight: 800;
  line-height: 1;
  padding: 2px 8px;
  border-radius: var(--r-pill);
  transition: background 0.2s ease, color 0.2s ease, transform 0.15s ease;
}
.hud-mult.m1 { color: var(--ink); background: rgba(255,255,255,0.05); }
.hud-mult.m2 { color: #1a1208; background: var(--gold); transform: scale(1.08); }
.hud-mult.m3 { color: #1a1208; background: var(--shutter); transform: scale(1.14); }

/* Timer bar */
.timer-wrap {
  position: relative;
  height: 10px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--r-pill);
  overflow: hidden;
}
.timer-fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 100%;
  background: linear-gradient(90deg, var(--ok), var(--gold), var(--bad));
  transform-origin: left center;
  transform: scaleX(1);
  transition: transform 0.95s linear;
}
.timer-fill.danger {
  animation: pulse 0.4s ease-in-out infinite alternate;
}
@keyframes pulse {
  from { opacity: 0.6; }
  to   { opacity: 1; }
}

/* Question card */
.qcard {
  background: linear-gradient(180deg, rgba(22,38,59,0.85), rgba(10,20,32,0.95));
  border: 1px solid rgba(26,107,154,0.4);
  border-radius: var(--r-lg);
  padding: 22px 24px;
  box-shadow: 0 18px 36px rgba(0,0,0,0.35);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.q-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.q-tag {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.16em;
  padding: 3px 9px;
  border-radius: var(--r-pill);
  text-transform: uppercase;
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(255,255,255,0.04);
  color: var(--ink-dim);
}
.q-tag.t-aperture { color: #1a1208; background: var(--aperture); border-color: var(--aperture); }
.q-tag.t-shutter  { color: #1a1208; background: var(--shutter);  border-color: var(--shutter);  }
.q-tag.t-iso      { color: #fff;     background: var(--iso);      border-color: var(--iso);      }
.q-tag.t-balance  { color: #1a1208; background: var(--balance);  border-color: var(--balance);  }
.q-tag.t-exif     { color: #fff;     background: var(--steel);    border-color: var(--steel);    }

.q-counter { font-size: 12px; color: var(--ink-mute); font-family: var(--mono); }

.q-prompt {
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.q-sub {
  font-style: italic;
  font-size: 13px;
  color: var(--ink-dim);
  margin: -6px 0 0;
}

.q-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 6px;
}
@media (max-width: 480px) {
  .q-options { grid-template-columns: 1fr; }
}

.q-option {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--r-md);
  padding: 14px 16px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  text-align: left;
  transition: background 0.12s ease, border-color 0.12s ease, transform 0.06s ease;
  display: flex;
  align-items: center;
  gap: 10px;
}
.q-option:hover  { background: rgba(37,136,192,0.15); border-color: var(--steel-2); color: #fff; }
.q-option:active { transform: scale(0.985); }
.q-option .letter {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 800;
  color: var(--gold);
  background: rgba(245,184,90,0.12);
  padding: 2px 7px;
  border-radius: var(--r-sm);
  flex-shrink: 0;
}
.q-option.correct { border-color: var(--ok); background: rgba(108,203,127,0.15); color: #fff; }
.q-option.correct .letter { color: var(--ok); background: rgba(108,203,127,0.2); }
.q-option.wrong   { border-color: var(--bad); background: rgba(208,90,90,0.15); color: #fff; }
.q-option.wrong   .letter { color: var(--bad); background: rgba(208,90,90,0.2); }
.q-option.disabled { pointer-events: none; opacity: 0.55; }
.q-option.disabled.correct,
.q-option.disabled.wrong { opacity: 1; }

/* Feedback panel that appears after answer */
.feedback {
  background: rgba(26,107,154,0.12);
  border-left: 3px solid var(--gold);
  border-radius: var(--r-sm);
  padding: 10px 14px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink);
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
.feedback .ic {
  font-weight: 800;
  font-size: 16px;
  margin-top: -1px;
}
.feedback.correct  { border-color: var(--ok);  background: rgba(108,203,127,0.1); }
.feedback.correct  .ic { color: var(--ok); }
.feedback.wrong    { border-color: var(--bad); background: rgba(208,90,90,0.1); }
.feedback.wrong    .ic { color: var(--bad); }
.feedback.timeout  { border-color: var(--gold); }
.feedback.timeout  .ic { color: var(--gold); }

.next-row {
  display: flex;
  justify-content: flex-end;
}

/* ============== END ============== */
.end {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 620px;
}
.end-content {
  background: linear-gradient(180deg, rgba(22,38,59,0.85), rgba(10,20,32,0.95));
  border: 1px solid rgba(26,107,154,0.5);
  border-radius: var(--r-lg);
  padding: 28px 32px;
  box-shadow: 0 24px 56px rgba(0,0,0,0.4);
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
}
.big-score {
  font-size: 72px;
  font-weight: 800;
  line-height: 1;
  color: var(--gold);
  letter-spacing: -0.04em;
  margin: 4px 0 4px;
  font-variant-numeric: tabular-nums;
}
.accuracy {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 18px;
}

.review {
  margin: 18px 0 22px;
  padding-top: 16px;
  border-top: 1px solid rgba(26,107,154,0.3);
}
.review-item {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--r-md);
  padding: 10px 14px;
  margin-bottom: 8px;
  font-size: 13px;
}
.review-item.perfect {
  background: rgba(108,203,127,0.1);
  border-color: rgba(108,203,127,0.4);
  color: var(--ok);
  text-align: center;
  padding: 14px;
  font-size: 15px;
}
.review-q  { font-weight: 700; color: #fff; margin-bottom: 4px; }
.review-because { color: var(--ink-dim); margin-top: 4px; font-size: 13px; }

@media (max-width: 600px) {
  body { padding: 14px; }
  h1 { font-size: 32px; }
  .intro-content, .end-content { padding: 22px 22px; }
  .q-prompt { font-size: 17px; }
  .hud { grid-template-columns: 1fr 1fr 1fr 1fr; }
  .hud-value, .hud-mult { font-size: 17px; }
  .big-score { font-size: 56px; }
}