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

body {
  background: #fff;
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  color: #1a1a1a;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  /* allow scrolling on small screens */
  overflow: auto;
  user-select: none;
  -webkit-font-smoothing: antialiased;
}

#experiment {
  text-align: center;
  width: 100%;
}

/* ----------------------------------------------------------------
   Screens: hidden by default, .active makes them visible
   ---------------------------------------------------------------- */
.screen {
  display: none;
}
.screen.active {
  display: block;
}

/* ----------------------------------------------------------------
   Info screens (welcome, practice, break, end)
   ---------------------------------------------------------------- */
.screen-card {
  max-width: 540px;
  margin: 0 auto;
  padding: 48px 36px;
  line-height: 1.7;
}

.screen-card h2 {
  font-size: 1.6em;
  font-weight: 700;
  margin-bottom: 8px;
  color: #111;
  letter-spacing: -0.02em;
}

.screen-card .subtitle {
  font-size: 0.95em;
  color: #666;
  margin-bottom: 28px;
}

.screen-card p {
  margin-bottom: 6px;
  font-size: 0.95em;
  color: #333;
}

/* Horizontal rule used as section divider */
.screen-card hr {
  border: none;
  border-top: 1px solid #e5e5e5;
  margin: 24px 0;
}

/* ----------------------------------------------------------------
   Kbd tags
   ---------------------------------------------------------------- */
kbd {
  background: #f4f4f5;
  border: 1px solid #d4d4d8;
  border-radius: 4px;
  padding: 2px 7px;
  font-family: "SF Mono", "Fira Code", "Courier New", monospace;
  font-size: 0.88em;
  color: #333;
}

/* ----------------------------------------------------------------
   Buttons
   ---------------------------------------------------------------- */
button {
  padding: 10px 28px;
  font-size: 0.95em;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid #d4d4d8;
  border-radius: 8px;
  background: #fff;
  color: #1a1a1a;
  transition:
    background 0.15s,
    border-color 0.15s;
}
button:hover {
  background: #f4f4f5;
  border-color: #a1a1aa;
}

.btn-primary {
  background: #111;
  color: #fff;
  border-color: #111;
}
.btn-primary:hover {
  background: #333;
  border-color: #333;
}

/* ----------------------------------------------------------------
   Parameter form on welcome screen
   ---------------------------------------------------------------- */
.params-section {
  text-align: left;
  max-width: 360px;
  margin: 0 auto;
}

body.simple-mode .researcher-only {
  display: none;
}

.param-group {
  margin: 10px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.9em;
  color: #444;
}
.param-group label {
  flex: 1;
}

.param-group input[type="number"],
.param-group input[type="text"],
.param-group select {
  padding: 6px 10px;
  font-size: 0.9em;
  border: 1px solid #d4d4d8;
  border-radius: 6px;
  background: #fafafa;
  color: #1a1a1a;
  outline: none;
  transition: border-color 0.15s;
}
.param-group input[type="number"]:focus,
.param-group input[type="text"]:focus,
.param-group select:focus {
  border-color: #888;
}
.param-group input[type="number"] {
  width: 80px;
  text-align: center;
}
.param-group input[type="text"] {
  width: 160px;
}

.param-group input[type="checkbox"] {
  margin-right: 8px;
  accent-color: #111;
}

.advanced-settings {
  margin: 16px 0 4px;
  text-align: left;
  max-width: 360px;
  margin-left: auto;
  margin-right: auto;
}
.advanced-settings summary {
  cursor: pointer;
  font-size: 0.85em;
  color: #888;
  padding: 4px 0;
  transition: color 0.15s;
}
.advanced-settings summary:hover {
  color: #555;
}
.advanced-settings .param-group {
  margin-left: 0;
}

/* ----------------------------------------------------------------
   Summary tables on end screen
   ---------------------------------------------------------------- */
#screen-end {
  overflow-y: auto;
  max-height: 100vh;
}

#screen-end h3 {
  font-size: 0.8em;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #888;
  margin-top: 28px;
  margin-bottom: 10px;
}

.summary-table {
  margin: 0 auto;
  border-collapse: collapse;
  font-size: 0.88em;
  width: 100%;
  max-width: 460px;
}
.summary-table th,
.summary-table td {
  padding: 8px 14px;
  text-align: center;
  border-bottom: 1px solid #eee;
}
.summary-table thead th {
  background: #fafafa;
  color: #666;
  font-weight: 600;
  font-size: 0.85em;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 2px solid #e5e5e5;
}
.summary-table td:first-child {
  font-weight: 600;
  text-align: left;
  color: #333;
}
.summary-table tbody tr:last-child td {
  border-bottom: none;
}

/* Overall score highlight */
.overall-score {
  font-size: 1.05em;
  color: #333;
  margin-bottom: 4px;
}

/* ----------------------------------------------------------------
   Mobile / desktop visibility
   ---------------------------------------------------------------- */
.mobile-only {
  display: none !important;
}
body.touch .mobile-only {
  display: block !important;
}
body.touch .desktop-only {
  display: none !important;
}

/* ----------------------------------------------------------------
   Mobile response buttons
   ---------------------------------------------------------------- */
#mobile-buttons {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: none !important;
  gap: 0;
}
body.touch.awaiting-response #mobile-buttons {
  display: flex !important;
}

.btn-response {
  flex: 1;
  padding: 28px 0;
  font-size: 1.2em;
  font-weight: bold;
  border: none;
  border-top: 1px solid #e5e5e5;
  border-radius: 0;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  transition: background 0.1s;
}
#btn-word {
  background: #dcfce7;
  border-right: 1px solid #e5e5e5;
}
#btn-word:active {
  background: #bbf7d0;
}
#btn-nonword {
  background: #fee2e2;
  border-left: 1px solid #e5e5e5;
}
#btn-nonword:active {
  background: #fecaca;
}

/* Continue buttons on info screens (mobile only) */
.btn-continue {
  margin-top: 16px;
  padding: 14px 32px;
  font-size: 1.05em;
}

/* On touch devices, give trial content room above the button bar */
body.touch #screen-trial {
  padding-bottom: 90px;
}

/* ----------------------------------------------------------------
   Trial display area
   ---------------------------------------------------------------- */
#trial-content {
  font-size: 48px;
  font-family: "Courier New", Courier, monospace;
  min-height: 80px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.fixation {
  font-size: 48px;
  font-family: "Courier New", Courier, monospace;
  color: #333;
}

.stimulus,
.mask {
  font-size: 48px;
  font-family: "Courier New", Courier, monospace;
  text-transform: uppercase;
  color: #111;
}

.prompt {
  font-size: 22px;
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  color: #555;
}

.feedback {
  font-size: 22px;
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  color: #333;
}

/* Mobile adjustments: allow vertical scrolling and reduce padding */
@media (max-width: 720px) {
  body {
    /* keep cards vertically centered on small screens, allow scrolling if needed */
    align-items: center;
    padding: 20px 0;
  }
  .screen-card {
    max-height: calc(100vh - 40px);
    overflow-y: auto;
    padding: 24px 18px;
    margin: 0 12px;
  }
}