/* ============================================================
   VARIABLES
   ============================================================ */
:root {
  --bg:           #0d0e12;
  --surface:      #161820;
  --surface-2:    #1e2030;
  --border:       #2a2d3e;
  --text:         #e8e9f0;
  --muted:        #8b8fa8;
  --gold:         #e8c547;
  --gold-dark:    #d4b03a;
  --blue:         #5b8dee;
  --blue-dark:    #4a7ad8;
  --reward:       #22c55e;
  --no-reward:    #f87171;
  --shadow:       0 2px 20px rgba(0,0,0,0.35);
  --radius:       14px;
}

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

html {
  overscroll-behavior-y: none;
}

body {
  font-family: 'DM Sans', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 1.5rem 1rem;
  overscroll-behavior-y: none;
}

/* ============================================================
   SCREENS
   ============================================================ */
.screen {
  display: none;
  width: 100%;
  max-width: 640px;
}

.screen.active {
  display: block;
  animation: fadeUp 0.28s ease;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============================================================
   CARD
   ============================================================ */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
}

/* ============================================================
   NYPE HEADER
   ============================================================ */
.nype-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1.75rem;
}

.nype-badge {
  font-family: 'DM Mono', monospace;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: #0d0e12;
  background: var(--gold);
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  text-transform: uppercase;
}

.nype-sub {
  font-family: 'DM Mono', monospace;
  font-size: 0.7rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

/* ============================================================
   TYPOGRAPHY
   ============================================================ */
h1 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: clamp(1.5rem, 4vw, 1.9rem);
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
  line-height: 1.25;
}

h2 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: clamp(1.25rem, 3.5vw, 1.55rem);
  font-weight: 600;
  color: var(--text);
  margin-bottom: 1rem;
  line-height: 1.3;
}

p {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--muted);
  margin-bottom: 0.85rem;
}

p strong { color: var(--text); }
.muted { color: var(--muted); }

/* ============================================================
   FORM
   ============================================================ */
.form-group {
  margin: 1.5rem 0 1.25rem;
}

.form-group label {
  display: block;
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

input[type="text"] {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: 'DM Sans', sans-serif;
  font-size: 1rem;
  color: var(--text);
  outline: none;
  transition: border-color 0.18s;
}

input[type="text"]:focus { border-color: var(--gold); }
input[type="text"]::placeholder { color: var(--muted); opacity: 0.6; }

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: block;
  width: 100%;
  padding: 0.8rem 1.5rem;
  border: none;
  border-radius: 9px;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.18s, transform 0.1s;
  text-align: center;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--gold);
  color: #0d0e12;
}
.btn-primary:hover:not(:disabled) { background: var(--gold-dark); }
.btn-primary:disabled {
  background: var(--surface-2);
  color: var(--muted);
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover { background: var(--border); }

/* ============================================================
   TASK SCREEN
   ============================================================ */
#screen-task {
  display: none;
  max-width: 480px;
  margin: 0 auto;
}
#screen-task.active { display: block; }

.task-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.task-header {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1rem 1.5rem;
}

.task-mode-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
}

.score-box, .trial-info {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
}

.score-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.score-value {
  font-family: 'Playfair Display', serif;
  font-size: 2rem;
  font-weight: 700;
  color: var(--gold);
  line-height: 1;
}

.trial-value {
  font-family: 'Playfair Display', serif;
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1;
}

.feedback-area {
  height: 2.6rem;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'DM Mono', monospace;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: 8px;
  letter-spacing: 0.02em;
}

.fb-reward    { color: var(--reward); }
.fb-no-reward { color: var(--no-reward); }

.choices-container {
  display: flex;
  gap: 1.25rem;
  width: 100%;
}

.choice-btn {
  flex: 1;
  height: clamp(110px, 28vw, 190px);
  border: none;
  border-radius: var(--radius);
  font-family: 'Playfair Display', serif;
  font-size: clamp(2.2rem, 7vw, 3.5rem);
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.12s, filter 0.15s;
  box-shadow: 0 6px 24px rgba(0,0,0,0.35);
}

.choice-btn:active:not(:disabled) { transform: scale(0.92); }
.choice-btn:hover:not(:disabled)  { filter: brightness(1.1); }
.choice-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.choice-btn.pressed  { transform: scale(0.92); }

.choice-A { background: var(--gold);  color: #0d0e12; }
.choice-B { background: var(--blue);  color: #ffffff; }

/* Welcome screen mock buttons */
.welcome-mock {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin: 1.25rem 0 0.5rem;
}
.mock-btn {
  width: 72px;
  height: 72px;
  border-radius: 14px;
  font-family: 'Playfair Display', serif;
  font-size: 1.8rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.75;
  pointer-events: none;
  user-select: none;
}
.mock-A { background: var(--gold); color: #0d0e12; }
.mock-B { background: var(--blue); color: #ffffff; }
.mock-caption {
  font-size: 0.85rem;
  color: var(--muted);
  text-align: center;
  margin-bottom: 1rem;
  line-height: 1.55;
}

/* ============================================================
   RESULTS
   ============================================================ */
.chart-wrapper {
  width: 100%;
  height: 280px;
  margin: 1.25rem 0;
}

@media (min-width: 480px) {
  .chart-wrapper { height: 340px; }
}

.chart-explainer {
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.5;
  margin: -0.25rem 0 1rem;
}

.info-box {
  background: var(--surface-2);
  border-left: 3px solid var(--gold);
  border-radius: 4px;
  padding: 0.85rem 1rem;
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--muted);
  margin-bottom: 1.25rem;
}

.info-box strong { color: var(--text); }

.loading-text {
  text-align: center;
  color: var(--muted);
  font-family: 'DM Mono', monospace;
  font-size: 0.8rem;
  padding: 0.5rem 0 1rem;
  min-height: 2rem;
}

/* ============================================================
   LEARN MORE
   ============================================================ */
.learn-card h2 { margin-bottom: 1.5rem; }

.learn-section { margin-bottom: 1.75rem; }

.learn-section h3 {
  font-family: 'DM Mono', monospace;
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gold);
  margin-bottom: 0.75rem;
}

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

.learn-neuro {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
}

blockquote {
  border-left: 3px solid var(--blue);
  padding: 0.75rem 1rem;
  margin: 1rem 0;
  background: var(--surface-2);
  border-radius: 0 6px 6px 0;
}

blockquote p {
  font-style: italic;
  margin-bottom: 0.4rem;
  color: var(--text);
  font-size: 0.9rem;
}

cite {
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  color: var(--muted);
  font-style: normal;
}

.formula {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  font-family: Georgia, 'Times New Roman', serif;
  font-size: 1rem;
  text-align: center;
  color: var(--text);
  margin: 0.75rem 0;
}

.formula-note {
  font-size: 0.85rem;
  font-style: italic;
  color: var(--muted);
}

/* Bullet lists inside learn sections */
.learn-list {
  margin: 0.5rem 0 0.75rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.6;
}

/* References */
.refs-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.refs-list li {
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--muted);
  padding-left: 1rem;
  border-left: 2px solid var(--border);
}

.ref-authors { color: var(--text); font-weight: 500; }
.ref-year    { color: var(--muted); }
.ref-title   { color: var(--text); }
.ref-journal { color: var(--muted); }
.ref-note    {
  display: block;
  margin-top: 0.2rem;
  font-family: 'DM Mono', monospace;
  font-size: 0.78rem;
  color: var(--muted);
  opacity: 0.8;
}

/* Footer */
.learn-footer {
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
}

.learn-footer .btn { max-width: 280px; }

.author-credit {
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  color: var(--muted);
  opacity: 0.6;
  margin: 0;
  text-align: center;
  letter-spacing: 0.03em;
}

/* ============================================================
   LEADERBOARD
   ============================================================ */
:root {
  --silver: #a0a8c0;
  --bronze: #cd7f32;
}

.lb-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.lb-title {
  font-family: 'Playfair Display', serif;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
}

.lb-status {
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  color: var(--muted);
}

.lb-row {
  display: grid;
  grid-template-columns: 36px 1fr auto;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border);
}

.lb-row:last-child { border-bottom: none; }

.lb-row.rank-1 { border-left: 3px solid var(--gold);    padding-left: 0.6rem; }
.lb-row.rank-2 { border-left: 3px solid var(--silver);  padding-left: 0.6rem; }
.lb-row.rank-3 { border-left: 3px solid var(--bronze);  padding-left: 0.6rem; }
.lb-row.rank-4 { border-left: 3px solid transparent;    padding-left: 0.6rem; }

.lb-rank {
  font-family: 'Playfair Display', serif;
  font-size: 1.1rem;
  text-align: center;
  line-height: 1;
}
.lb-rank.r1 { color: var(--gold); }
.lb-rank.r2 { color: var(--silver); }
.lb-rank.r3 { color: var(--bronze); }
.lb-rank.rn { color: var(--muted); font-size: 0.9rem; }

.lb-info { min-width: 0; }

.lb-name {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lb-score {
  font-family: 'Playfair Display', serif;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--muted);
  white-space: nowrap;
}
.lb-score.r1 { color: var(--gold); }

.lb-empty {
  text-align: center;
  padding: 2rem 1rem;
  font-family: 'DM Mono', monospace;
  font-size: 0.85rem;
  color: var(--muted);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 480px) {
  body { padding: 0.75rem 0.5rem; }
  .card { padding: 1.25rem; border-radius: 10px; }
  .choices-container { gap: 0.85rem; }
  .nype-sub { display: none; }
}