/* --- Root Variables & Themes --- */
:root {
  --font-family: 'Inter', sans-serif;
  --border-radius: 10px;
  --transition-speed: 0.28s;
  --bg-color: #121212;
  --text-color: #E0E0E0;
  --sidebar-bg: #1E1E1E;
  --sidebar-border: #333;
  --input-bg: #2C2C2C;
  --input-border: #444;
  --input-text: #E0E0E0;
  --button-bg: #333;
  --button-text: #E0E0E0;
  --accent-color: #3B82F6;
  --shadow-color: rgba(0,0,0,0.22);
}

/* html.light { */
body.light {
  --bg-color: #F4F4F5;
  --text-color: #18181B;
  --sidebar-bg: #FFFFFF;
  --sidebar-border: #E4E4E7;
  --input-bg: #FFFFFF;
  --input-border: #D4D4D8;
  --input-text: #18181B;
  --button-bg: #E4E4E7;
  --button-text: #18181B;
  --accent-color: #2563EB;
  --shadow-color: rgba(0, 0, 0, 0.10);
}

/* --- Base Layout & Typography --- */
html, body {
  height: 100%;
  margin: 0;
  font-family: var(--font-family);
  background: var(--bg-color);
  color: var(--text-color);
  transition: background var(--transition-speed) ease, color var(--transition-speed) ease;
}

.container {
  display: flex;
  height: 100vh;
  gap: 0;
}

/* --- Sidebar --- */
#sidebar {
  width: 320px;
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  padding: 20px;
  box-sizing: border-box;
  border-right: 1px solid var(--sidebar-border);
  box-shadow: 2px 0 18px var(--shadow-color);
  overflow: auto;
}

#sidebar h2 {
  margin: 0 0 12px 0;
  font-size: 20px;
  color: var(--accent-color);
}

/* --- Forms & Inputs --- */
label {
  display: block;
  font-size: 13px;
  margin: 10px 0 6px;
  color: var(--input-text);
}

input[type="text"], input[type="number"], select, input[type="range"] {
  width: 100%;
  padding: 9px;
  border-radius: 10px;
  border: 1px solid var(--input-border);
  background: var(--input-bg);
  color: var(--input-text);
  box-sizing: border-box;
}

input[type="color"] {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  padding: 0;
  cursor: pointer;
  border: 1px solid var(--input-border);
  border-radius: 20%;
}
input[type="color"]::-webkit-color-swatch { border-radius: 20%; }
input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }

.colour-div {
  display: flex;
  align-items: center;
  width: 100%;
  padding-top: 10px;
  white-space: nowrap;
  justify-content: space-between;
}
.color-parent-div {
  display: inline-flex;
  gap: 10px;
  align-items: center;
}

.switch { position: relative; display:inline-block; min-width:44px; height:24px; }
.switch input { display:none; }
.slider { position:absolute; inset:0; background:#555; border-radius:24px; transition:0.2s; }
.slider:before { content:""; position:absolute; left:4px; top:4px; width:16px; height:16px; background:#fff; border-radius:50%; transition:0.2s; }
.switch input:checked + .slider { background: var(--accent-color); }
.switch input:checked + .slider:before { transform: translateX(20px); }

/* --- Buttons & UI Elements --- */
.row { display: flex; gap: 8px; }
.btn {
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,0.04);
  background: var(--button-bg);
  color: var(--button-text);
  cursor: pointer;
}
.btn.primary {
  background: linear-gradient(180deg, var(--accent-color), #2563eb);
  color: #fff;
  font-weight: 600;
  border-color: transparent;
}
.muted { color: rgb(from var(--button-text) r g b / 0.5); font-size: 14px; }

details.advanced-config {
  margin-top: 12px;
  border: 1px solid var(--input-border);
  border-radius: 10px;
  padding: 6px;
  background: transparent;
}
details.advanced-config summary {
  outline: none;
  padding: 8px;
  cursor: pointer;
}

/* --- Main Content Area --- */
#main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: 28px;
  gap: 12px;
}
#title {
  font-size: 20px;
  margin: 0;
  align-self: flex-start;
  color: var(--text-color);
}
.stage {
  width: min(920px, 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-top: 6px;
}
.statusRow {
  display: flex;
  gap: 12px;
  align-items: center;
  width: 100%;
  justify-content: center;
}
.infoBox {
  background: var(--sidebar-bg);
  padding: 10px;
  border-radius: 10px;
  color: var(--input-text);
  font-size: 14px;
}
#resultsSummary {
  width: 100%;
  max-width: 920px;
  display: none;
  margin-top: 8px;
}

/* --- Stimulus Area (COMMON + SPECIFIC) --- */
.stimulus {
  width: 100%;
  height: 65vh;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  box-shadow: 0 8px 30px rgba(2,6,23,0.5);
  font-weight: 700;
  user-select: none;
  position: relative;
  overflow: hidden;
  line-height: 1; 
  text-align: center;
}

/* Test-specific stimulus styles */
/* .stimulus.stroop { font-size: 58px; }
.stimulus.cpt    { font-size: 120px; }
.stimulus.gng    { font-size: 240px; }
.stimulus.gng.big { font-size: 400px; } For GNG shape mode */

/* Test-specific stimulus styles (using clamp for robust responsiveness) */
.stimulus.stroop {font-size: clamp(3rem, 20cqmin, 15rem);}
.stimulus.cpt    { font-size: clamp(120px, 50cqw, 80cqh); }
.stimulus.gng    { font-size: clamp(240px, 50cqw, 65cqh); }
.stimulus.gng.big { font-size: clamp(400px, 50cqw, 90cqh); }

/* --- Popups, Modals & Overlays --- */
#popup, #instructions, #countdownOverlay, #bindingsModal {
  display: none;
  position: fixed;
  inset: 0;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.5);
  z-index: 1000;
}
#instructions, #countdownOverlay, #bindingsModal { backdrop-filter: blur(5px); }
#instructions { display: flex; } /* Show instructions initially */

.popup-card, #instructions > div {
  background: var(--sidebar-bg);
  padding: 24px;
  border-radius: 12px;
  max-width: 700px;
  width: 92%;
  max-height: 80vh;
  overflow: auto;
  box-shadow: 0 14px 40px rgba(0,0,0,0.6);
}
#instructions > div { text-align: left; line-height: 1.7; }

#countdownNum { font-size: 160px; font-weight: 800; color: var(--accent-color); }
canvas { background: #fff; border-radius: 8px; display: block; margin: 12px auto; }
#modernAlert {
  position: fixed;
  top: -120px;
  left: 50%;
  transform: translateX(-50%);
  background: #ff4757;
  color: white;
  padding: 12px 22px;
  border-radius: 8px;
  z-index: 9999;
  transition: top .4s;
}
#modernAlert.show { top: 18px; }

/* --- Test-Specific Unique Styles --- */

/* Stroop */
.stimulus .word { display: inline-block; will-change: transform;transition: none; min-width: 10vw;}
.keybar { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 6px; }
.key {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 10px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,0.04);
  min-width: 88px;
  cursor: default;
  box-shadow: 0 6px 18px rgba(2,6,23,0.4);
  transition: transform .08s,box-shadow .08s;
}
.key .kbd { font-size: 13px; padding: 6px 8px; border-radius: 6px; background: rgba(0,0,0,0.12); margin-bottom: 8px; }
.key .colname { font-weight: 700; }
.key.pressed { transform: translateY(-3px); box-shadow: 0 14px 30px rgba(2,6,23,0.55); }
#bindingsModal > div {
  background:var(--sidebar-bg);padding:16px;border-radius:12px;width:460px;box-shadow:0 10px 30px rgba(0,0,0,0.4)
}

/* CPT */
.small-note { font-size:12px; color:var(--input-text); opacity:0.8 }
.letters-grid { display:grid; grid-template-columns: repeat(3,1fr); gap:6px; margin-top:6px; }
.letters-grid label { display:flex; align-items:center; gap:8px; font-size:13px; }

/* --- Utility & Responsive --- */
#modeToggle,.floatbutton {
  position: absolute;
  top: 15px;
  right: 15px;
  cursor: pointer;
  background: var(--button-bg);
  color: var(--button-text);
  padding: 4px 4px;
  border-radius: 10px;
  font-size: 14px;
  
}

@media (max-width:900px) {
  /* #sidebar { display: none; } */
  .container { flex-direction: column; }
  #main { padding: 12px; }
  .stimulus { height: 180px; font-size: 88px; }
  .stimulus.cpt { font-size: 100px; }
  .stimulus.gng { font-size: 150px; }
  .stimulus.gng.big { font-size: 200px; }
}


/* --- Landing Page Specific Styles --- */

.landing-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  padding: 40px 20px;
  height: auto;
}

.landing-header {
  text-align: center;
  margin-bottom: 40px;
}

.landing-header h1 {
  font-size: 2.2rem;
  margin: 0 0 10px;
}

.landing-header p {
  font-size: 1rem;
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.6;
  color: #aaa; 
}
.landing-body a {
  text-decoration: none;
}
body.light .landing-header p {
    color: #555;
}

.landing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  width: 100%;
  max-width: 1000px;
}

.landing-card {
  background: var(--sidebar-bg); /* Using variable from common.css */
  padding: 24px;
  border-radius: var(--border-radius);
  box-shadow: 0 6px 18px var(--shadow-color);
  border: 1px solid var(--sidebar-border);
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.landing-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 24px var(--shadow-color);
}

.landing-card h2 {
  margin-top: 0;
  font-size: 1.4rem;
  color: var(--accent-color);
}

.landing-card p {
  flex: 1;
  font-size: 0.95rem;
  line-height: 1.6;
  margin: 10px 0 20px;
}

.landing-card a.btn {
  align-self: flex-start;
}

/* change ugly scroll bar in chrome to thin and mode depended */


/* For Firefox */
html {
  scrollbar-width: thin;
  scrollbar-color: rgb(from var(--accent-color) r g b / 0.6) transparent;
}

::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background-color: var(--sidebar-border); /* A subtle, non-hovered color */
  border-radius: 10px;

  border: 3px solid transparent;
  background-clip: content-box;
}

::-webkit-scrollbar-thumb:hover {
  /* On hover,  */
  background-color: rgb(from var(--accent-color) r g b / 0.6);
}

/* langbutton */
#languageToggle {
  font-family: var(--font-family);
  position: absolute;
  top: 15px;
  right: 55px;
  cursor: pointer;
  background: var(--button-bg);
  color: var(--button-text);
  padding: 4px 4px;
  border-radius: 10px;
  font-size: 14px;
  min-width: 31px;
  min-height: 31px;
}

.hidden,.noshow {
  display: none !important;
}