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

:root {
  --bg:       #f2f5fb;
  --surface:  #ffffff;
  --surface2: #eaeff8;
  --border:   #d0d7ea;
  --accent:   #1a3a70;
  --red:      #c84323;
  --gold:     #e8b830;
  --green:    #27733a;
  --text:     #18243c;
  --muted:    #5a6a85;
  --r:        10px;
  --font:     system-ui, -apple-system, 'Segoe UI', Helvetica, Arial, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100dvh;
  line-height: 1.5;
}

/* ── Screens ─────────────────────────────────────────────────── */
.screen { display: none; }
.screen.active { display: flex; flex-direction: column; align-items: center; min-height: 100dvh; }
#screen-welcome.active, #screen-name.active { justify-content: center; padding: 2rem 1rem; }
#screen-results.active { justify-content: flex-start; padding: 2rem 1rem; }

/* ── Card ────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2.5rem;
  width: min(580px, 100%);
  box-shadow: 0 6px 32px rgba(26, 58, 112, .09);
}

/* ── Welcome background ──────────────────────────────────────── */
#screen-welcome {
  background-size: cover;
  background-position: center;
  position: relative;
}

#screen-welcome::before {
  content: '';
  position: absolute;
  inset: 0;
  -webkit-backdrop-filter: blur(18px) brightness(0.75) saturate(0.45);
  backdrop-filter: blur(18px) brightness(0.75) saturate(0.45);
  background: rgba(242, 245, 251, 0.78);
  z-index: 0;
}

#screen-welcome .card {
  position: relative;
  z-index: 1;
}

/* ── Brand logo ──────────────────────────────────────────────── */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.6rem;
}

.logo-img {
  height: 44px;
  width: auto;
  flex-shrink: 0;
}

.brand-logo-text {
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  line-height: 1.4;
}

/* ── Welcome ─────────────────────────────────────────────────── */
.badge {
  display: inline-block;
  background: rgba(26, 58, 112, .08);
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  border: 1px solid rgba(26, 58, 112, .2);
  margin-bottom: 1.1rem;
}

h1 { font-size: 2.6rem; font-weight: 700; margin-bottom: 0.5rem; }
h2 { font-size: 1.6rem; font-weight: 700; margin-bottom: 1.25rem; }

.lead { color: var(--muted); font-size: 1rem; line-height: 1.65; margin-bottom: 1.75rem; }

kbd {
  display: inline-block;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 6px;
  padding: 0.2rem 0.55rem;
  font-size: 0.85rem;
  font-family: monospace;
  color: var(--text);
  line-height: 1.4;
}

/* ── Keyboard controls ───────────────────────────────────────── */
.key-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.key-card {
  flex: 1;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 1rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.55rem;
}

.key-chips {
  display: flex;
  gap: 0.4rem;
  justify-content: center;
}

.key-card span {
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 500;
}

.key-vs {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: .12em;
  flex-shrink: 0;
}

.img-count {
  color: var(--muted);
  font-size: 0.83rem;
  margin-bottom: 1.25rem;
  min-height: 1.2em;
  text-align: center;
}

.attribution {
  text-align: center;
  color: var(--muted);
  font-size: 0.78rem;
  margin-top: 1.25rem;
  line-height: 1.5;
}

/* ── Buttons ─────────────────────────────────────────────────── */
.btn-primary {
  display: block;
  width: 100%;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--r);
  padding: 0.85rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  touch-action: manipulation;
  transition: opacity .18s, transform .1s;
}
.btn-primary.inline { width: auto; white-space: nowrap; }
.btn-primary:active:not(:disabled) { transform: translateY(0); opacity: .85; }
.btn-primary:disabled { opacity: .35; cursor: not-allowed; }

.btn-ghost {
  display: block;
  width: 100%;
  background: none;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 0.75rem 1.5rem;
  font-size: 0.9rem;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  margin-top: 0.75rem;
  touch-action: manipulation;
  transition: color .18s, border-color .18s;
}

/* ── Game header ─────────────────────────────────────────────── */
.game-header {
  position: sticky;
  top: 0;
  z-index: 10;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 3fr 1fr;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 1.75rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 10px rgba(26, 58, 112, .07);
}

.header-stat { font-size: 0.88rem; color: var(--muted); font-weight: 500; }
.header-stat.right { text-align: right; }

.progress-bar {
  height: 5px;
  background: var(--surface2);
  border-radius: 3px;
  overflow: hidden;
}
#progress-fill {
  height: 100%;
  background: var(--accent);
  width: 0%;
  transition: width .45s ease;
}

/* ── Game main ───────────────────────────────────────────────── */
.game-main {
  width: 100%;
  max-width: 980px;
  padding: 1.5rem 1.75rem 2rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.4rem;
}

.prompt { font-size: 1.35rem; font-weight: 600; text-align: center; }
.prompt em { color: var(--accent); font-style: normal; }

/* ── Arena ───────────────────────────────────────────────────── */
.arena {
  width: 100%;
  display: flex;
  align-items: stretch;
  gap: 0.75rem;
}

.img-panel {
  flex: 1;
  position: relative;
  border: 2px solid var(--border);
  border-radius: var(--r);
  overflow: hidden;
  cursor: pointer;
  background: #0e1420;
  transition: border-color .2s ease, box-shadow .2s ease, transform .12s ease;
  user-select: none;
  touch-action: manipulation;
}
.img-panel:not(.disabled):active { transform: scale(.988); }
.img-panel.disabled { cursor: default; }

.img-panel img {
  width: 100%;
  display: block;
  object-fit: contain;
  max-height: 46vh;
  min-height: 180px;
  pointer-events: none;
}

.panel-label {
  position: absolute;
  top: 0.55rem;
  left: 0.55rem;
  background: rgba(0,0,0,.62);
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
  padding: 0.15rem 0.45rem;
  border-radius: 5px;
  z-index: 2;
  letter-spacing: .06em;
}

/* Neutral selection flash — no right/wrong revealed */
.img-panel.chosen {
  border-color: var(--accent) !important;
  box-shadow: 0 0 0 3px rgba(26, 58, 112, .22) !important;
}

/* ── VS divider ──────────────────────────────────────────────── */
.vs-divider {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  padding: 0 0.25rem;
  gap: 0.7rem;
}
.vs-divider::before, .vs-divider::after {
  content: '';
  flex: 1;
  width: 1px;
  background: var(--border);
}
.vs-divider span {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: .1em;
}

/* ── Feedback bar (kept for structural compatibility) ─────────── */
.feedback-bar {
  font-size: 1.05rem;
  font-weight: 600;
  padding: 0.7rem 1.5rem;
  border-radius: var(--r);
  text-align: center;
  min-height: 3.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 600px;
  opacity: 0;
  transition: opacity .25s;
}
.feedback-bar.correct-fb {
  opacity: 1;
  background: rgba(39, 115, 58, .1);
  color: var(--green);
  border: 1px solid rgba(39, 115, 58, .25);
}
.feedback-bar.incorrect-fb {
  opacity: 1;
  background: rgba(200, 67, 35, .1);
  color: var(--red);
  border: 1px solid rgba(200, 67, 35, .25);
}

/* ── Trial result dots ───────────────────────────────────────── */
.trial-dots {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  flex-wrap: wrap;
  margin: 0.25rem 0 1.25rem;
}
.trial-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
}
.trial-dot.correct { background: var(--green); }
.trial-dot.wrong   { background: var(--red); }

/* ── Name entry ──────────────────────────────────────────────── */
.final-score { text-align: center; margin: 0.75rem 0 1.5rem; }
.score-big { font-size: 3.6rem; font-weight: 700; color: var(--accent); line-height: 1; }
.score-sub { font-size: 1rem; color: var(--muted); margin-top: 0.3rem; }

.enter-name-label { margin-bottom: 0.75rem; }

.input-row { display: flex; gap: 0.65rem; }
.text-input {
  flex: 1;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.75rem 1rem;
  border-radius: var(--r);
  font-size: 1rem;
  font-family: var(--font);
  outline: none;
  transition: border-color .18s;
  min-width: 0;
}
.text-input:focus { border-color: var(--accent); }
.text-input.error { border-color: var(--red); }

/* ── Results ─────────────────────────────────────────────────── */
.results-wrap {
  width: min(680px, 100%);
  padding: 0 0 2rem;
}

.your-result {
  background: var(--surface);
  border: 1px solid rgba(26, 58, 112, .28);
  border-radius: var(--r);
  padding: 0.9rem 1.2rem;
  margin-bottom: 1.4rem;
  font-size: 0.97rem;
  color: var(--text);
}

.table-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
  overflow-x: auto;
  margin-bottom: 1.5rem;
  box-shadow: 0 2px 10px rgba(26, 58, 112, .06);
}
.lb-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.lb-table th {
  background: var(--surface2);
  padding: 0.7rem 1rem;
  text-align: left;
  color: var(--muted);
  font-weight: 600;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  border-bottom: 1px solid var(--border);
}
.lb-table td { padding: 0.65rem 1rem; border-bottom: 1px solid var(--border); }
.lb-table tr:last-child td { border-bottom: none; }
.lb-table tr.highlight td { background: rgba(26, 58, 112, .06); font-weight: 600; }
.lb-table tr.highlight td:first-child { color: var(--accent); }

.results-actions { display: flex; gap: 0.75rem; }
.results-actions .btn-primary,
.results-actions .btn-ghost { flex: 1; margin: 0; }

/* ── Touch vs pointer visibility ────────────────────────────── */
/* touch-hidden: visible on pointer devices, hidden on touch */
.touch-hidden { display: flex; }
.pointer-hidden { display: none; }

@media (hover: none) {
  .touch-hidden { display: none; }
  .pointer-hidden { display: block; }
}

.tap-hint {
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 1.75rem;
}

/* ── Hover effects — pointer devices only ────────────────────── */
@media (hover: hover) and (pointer: fine) {
  .img-panel:not(.disabled):hover {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(26, 58, 112, .16);
    transform: scale(1.012);
  }
  .btn-primary:hover:not(:disabled) { opacity: .85; transform: translateY(-1px); }
  .btn-ghost:hover { color: var(--text); border-color: var(--muted); }
}

/* ── Mobile ───────────────────────────────────────────────────── */
@media (max-width: 580px) {
  /* Welcome card */
  h1 { font-size: 1.9rem; }
  h2 { font-size: 1.35rem; }
  .card { padding: 1.5rem 1.1rem; }
  .brand-logo { flex-wrap: wrap; gap: 0.5rem; }
  .key-row { gap: 0.5rem; }
  .key-card { padding: 0.7rem 0.4rem; }

  /* Game header */
  .game-header {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
    padding: 0.6rem 1rem;
    gap: 0.5rem;
  }
  .progress-bar { grid-column: 1 / -1; grid-row: 2; }

  /* Game arena — stacked vertically */
  .game-main { padding: 0.75rem 0.75rem 1.25rem; gap: 0.75rem; }
  .prompt { font-size: 1.1rem; }
  .arena { flex-direction: column; }
  .vs-divider { flex-direction: row; padding: 0; gap: 0.5rem; }
  .vs-divider::before, .vs-divider::after { flex: 1; height: 1px; width: auto; }

  /* Each image: cap at ~32 vh so both fit with header on screen */
  .img-panel img { max-height: 32vh; min-height: 0; }

  /* Name entry */
  .input-row { flex-direction: column; }
  .btn-primary.inline { width: 100%; }

  /* Results */
  .score-big { font-size: 2.8rem; }
  .results-actions { flex-direction: column; }
  .results-wrap { padding-bottom: 1.5rem; }
}