[data-theme="dark"] .institution-logo img {
  filter: brightness(0) invert(1);
}

:root {
  --background: #f8f6f6;
  --back-alt: #ede8e8;
  --accent-prime: #d63a65;
  --text-sec: #6b4f4f;
  --text-main: #1a1515;
  --accent-sec: #3b82f6;
  --surface: #ffffff;
  --shadow-soft: 0 2px 12px rgba(61, 56, 52, 0.08);
  --shadow-medium: 0 4px 24px rgba(61, 56, 52, 0.12);
  --switch-star: #ffffff;
  --switch-bg: #a0c4f0;
  --switch-bg-top: #d0e4f5;
  --neg-color: #d63a65;
  --aff-color: #3b82f6;
}

[data-theme="dark"] {
  --background: #1a1520;
  --back-alt: #231d2c;
  --accent-prime: #f06090;
  --text-sec: #a89ab8;
  --text-main: #ede8f5;
  --accent-sec: #60a5fa;
  --surface: #2a2435;
  --shadow-soft: 0 2px 12px rgba(0, 0, 0, 0.3);
  --shadow-medium: 0 4px 24px rgba(0, 0, 0, 0.5);
  --switch-star: #ffffff;
  --switch-bg: #2a1f4a;
  --switch-bg-top: color-mix(in srgb, #60a5fa 70%, #2a1f4a);
  --neg-color: #f06090;
  --aff-color: #60a5fa;
}

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

body {
  font-family: "Alan Sans";
  font-weight: 400;
  background: linear-gradient(135deg, var(--background) 0%, var(--back-alt) 100%);
  background-attachment: fixed;
  color: var(--text-main);
  line-height: 1.7;
  min-height: 100vh;
  transition: background 0.3s ease, color 0.3s ease;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 60px 40px;
  animation: fadeIn 0.8s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

header {
  background: var(--surface);
  padding: 50px 60px;
  border-radius: 24px;
  box-shadow: var(--shadow-medium);
  margin-bottom: 40px;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
}

header::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-prime) 0%, color-mix(in srgb, var(--accent-prime), var(--accent-sec) 50%) 50%, var(--accent-sec) 100%);
  border-radius: 24px 24px 0 0;
}

h1 {
  font-family: "Alan Sans";
  font-weight: 800;
  font-size: 3rem;
  color: var(--text-main);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.tagline {
  font-size: 1.1rem;
  color: var(--text-sec);
  font-weight: 300;
  letter-spacing: 0.02em;
}

.back-link {
  display: inline-block;
  margin-top: 20px;
  color: var(--accent-sec);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
}
.back-link:hover { text-decoration: underline; }

/* ── Tabs ─────────────────────────────────────────────────────────────── */

.tabs {
  display: flex;
  gap: 12px;
  margin-bottom: 30px;
}

.tab-btn {
  font-family: "Alan Sans";
  font-weight: 600;
  font-size: 1rem;
  padding: 12px 24px;
  border-radius: 14px;
  border: none;
  cursor: pointer;
  background: var(--surface);
  color: var(--text-sec);
  box-shadow: var(--shadow-soft);
  transition: all 0.25s ease;
}

.tab-btn.active {
  background: var(--accent-prime);
  color: #fff;
  box-shadow: var(--shadow-medium);
  transform: translateY(-2px);
}

.tab-btn:hover:not(.active) {
  color: var(--text-main);
  transform: translateY(-2px);
}

.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeIn 0.5s ease-out; }

/* ── Section cards ────────────────────────────────────────────────────── */

section {
  background: var(--surface);
  padding: 45px 60px;
  border-radius: 24px;
  box-shadow: var(--shadow-soft);
  margin-bottom: 30px;
  backdrop-filter: blur(10px);
}

h2 {
  font-family: "Alan Sans";
  font-weight: 600;
  font-size: 1.7rem;
  color: var(--accent-prime);
  margin-bottom: 12px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--back-alt);
  letter-spacing: -0.01em;
}

.subtext {
  color: var(--text-sec);
  font-size: 0.98rem;
  margin-bottom: 24px;
}

/* ── Negation playground ──────────────────────────────────────────────── */

.stimulus {
  text-align: center;
  font-size: 1.6rem;
  font-weight: 600;
  margin-bottom: 30px;
  min-height: 2.2rem;
}

.trial-wrap {
  position: relative;
  height: 340px;
  background: var(--background);
  border-radius: 18px;
  overflow: hidden;
  user-select: none;
}

.target {
  position: absolute;
  top: 24px;
  width: 130px;
  padding: 16px 0;
  text-align: center;
  border-radius: 14px;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.03em;
  color: #fff;
  box-shadow: var(--shadow-soft);
  transition: transform 0.15s ease;
}

.target.left { left: 30px; }
.target.right { right: 30px; }
.target.red { background: #e0455f; }
.target.blue { background: #3b82f6; }
.target.armed { transform: scale(1.08); }

.start-btn {
  position: absolute;
  bottom: 26px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--accent-sec);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  cursor: grab;
  box-shadow: var(--shadow-medium);
  transition: transform 0.15s ease;
}
.start-btn:active { cursor: grabbing; transform: translateX(-50%) scale(0.95); }

#trailCanvas {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.trial-status {
  text-align: center;
  margin-top: 18px;
  color: var(--text-sec);
  font-size: 0.95rem;
  min-height: 1.4rem;
}

.trial-status.correct { color: var(--aff-color); font-weight: 600; }
.trial-status.incorrect { color: var(--neg-color); font-weight: 600; }

.legend {
  display: flex;
  gap: 24px;
  justify-content: center;
  margin-top: 16px;
  font-size: 0.9rem;
  color: var(--text-sec);
}
.legend span { display: flex; align-items: center; gap: 8px; }
.swatch { width: 14px; height: 14px; border-radius: 4px; display: inline-block; }

.results-box {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--back-alt);
  display: none;
}
.results-box.show { display: block; }

.result-summary {
  display: flex;
  gap: 40px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.result-stat { text-align: center; }
.result-stat .num { font-size: 2rem; font-weight: 800; }
.result-stat .lbl { color: var(--text-sec); font-size: 0.85rem; }
.result-stat.neg .num { color: var(--neg-color); }
.result-stat.aff .num { color: var(--aff-color); }

.reset-btn {
  font-family: "Alan Sans";
  font-weight: 600;
  margin-top: 16px;
  padding: 10px 20px;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  background: var(--back-alt);
  color: var(--text-main);
}
.reset-btn:hover { background: var(--accent-sec); color: #fff; }

/* ── Stats page ───────────────────────────────────────────────────────── */

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 16px;
  margin-bottom: 30px;
}
.stat-card {
  background: var(--background);
  border-radius: 16px;
  padding: 18px 12px;
  text-align: center;
}
.stat-card .num { font-size: 2rem; font-weight: 800; color: var(--accent-prime); }
.stat-card .lbl { font-size: 0.82rem; color: var(--text-sec); margin-top: 4px; }

.chart-wrap { margin-bottom: 10px; max-height: 320px; }

.timeline-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--back-alt);
  gap: 12px;
  flex-wrap: wrap;
}
.timeline-item:last-child { border-bottom: none; }
.timeline-title { font-weight: 600; }
.timeline-loc { color: var(--text-sec); font-size: 0.92rem; }
.timeline-year {
  color: var(--text-sec);
  background: var(--background);
  padding: 4px 14px;
  border-radius: 12px;
  font-size: 0.88rem;
  font-weight: 500;
}

@media (max-width: 768px) {
  .container { padding: 40px 20px; }
  header { padding: 35px; border-radius: 18px; }
  section { padding: 30px 28px; }
  h1 { font-size: 2.2rem; }
  .target { width: 100px; font-size: 0.9rem; padding: 12px 0; }
  .result-summary { gap: 20px; }
}

::selection { background: var(--accent-prime); color: white; }

/* ── Theme switch (copied from main site) ───────────────────────────── */
.switch {
  font-size: 17px;
  position: fixed;
  bottom: 32px;
  right: 32px;
  display: inline-block;
  width: 4em;
  height: 2.2em;
  border-radius: 30px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}
.switch input { opacity: 0; width: 0; height: 0; }
.slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(to top, var(--switch-bg), var(--switch-bg-top));
  transition: 0.4s;
  border-radius: 30px;
  overflow: hidden;
}
.slider:before {
  position: absolute;
  content: "";
  height: 1.2em;
  width: 1.2em;
  border-radius: 20px;
  left: 0.5em;
  bottom: 0.5em;
  transition: 0.4s;
  transition-timing-function: cubic-bezier(0.81, -0.04, 0.38, 1.5);
  box-shadow: inset 8px -4px 0px 0px var(--text-main);
}
.switch input:checked + .slider:before {
  transform: translateX(1.8em);
  box-shadow: inset 15px -4px 0px 15px #ffd8a8;
}
.star {
  background-color: var(--switch-star);
  border-radius: 50%;
  position: absolute;
  width: 5px; height: 5px;
  opacity: 1;
  transition: opacity 0.4s ease, transform 0.4s ease, filter 0.4s ease;
}
.switch input:checked ~ .slider .star { opacity: 0; transform: translateY(-8px); filter: blur(1px); }
.star_1 { left: 2.5em; top: 0.5em; }
.star_2 { left: 2.2em; top: 1.2em; }
.star_3 { left: 3em; top: 0.9em; }
.cloud {
  width: 3.5em;
  position: absolute;
  bottom: -1.4em;
  left: -1.1em;
  opacity: 0;
  transform: translateY(10px) scale(0.95);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.switch input:checked ~ .slider .cloud { opacity: 1; transform: translateY(0) scale(1); }