:root {
  --bg: #ffffff;
  --text: #050505;
  --muted: rgba(5, 5, 5, 0.72);
  --soft-muted: rgba(5, 5, 5, 0.5);
  --line: rgba(5, 5, 5, 0.12);
  --acid: #ceff00;
  --beige: #e9e1d3;
  --red: #F32227;
  --body-serif: "Instrument Serif", Georgia, serif;
  --mono: "Roboto Mono", monospace;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  border: 0;
  background: transparent;
}

.research-shell {
  padding-inline: clamp(0.75rem, 1.8vw, 1.5rem);
}

.top-nav {
  padding-top: 1.15rem;
  padding-bottom: 1rem;
}

.nav-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.nav-link-custom {
  font-size: 0.82rem;
  font-family: var(--mono);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  transition: filter 180ms ease, opacity 180ms ease, transform 180ms ease;
}

.nav-link-custom:hover,
.nav-link-custom.active {
  filter: blur(0.7px);
  opacity: 0.85;
}

.research-intro {
  padding-top: clamp(3rem, 7vw, 5rem);
  padding-bottom: 2rem;
}

.eyebrow {
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.research-title {
  margin: 0;
  width: 100%;
  max-width: none;
  font-family: var(--body-serif);
  font-size: clamp(3.2rem, 8vw, 7.6rem);
line-height: 1.02;
letter-spacing: 0.005em;
}

.research-accordion-section {
  padding-bottom: 5rem;
}

.research-accordion {
  --bs-accordion-border-color: transparent;
  --bs-accordion-bg: transparent;
  --bs-accordion-inner-border-radius: 0;
  --bs-accordion-btn-focus-border-color: transparent;
  --bs-accordion-btn-focus-box-shadow: none;
  --bs-accordion-active-bg: transparent;
  --bs-accordion-active-color: var(--text);
}

.research-item {
  border: 0;
  border-top:;
  border-radius: 0 !important;
}

.research-item:last-child {
  border-bottom:;
}

.research-button {
  display: grid !important;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 1rem;
  width: 100%;
  padding: 1.35rem 1rem 1.35rem 0;
  background: #ffffff !important;
  color: var(--text) !important;
  box-shadow: none !important;
  border-radius: 0 !important;
  transition: background-color 180ms ease, color 180ms ease;
}

.research-button:not(.collapsed),
.research-button:hover {
  background: var(--acid) !important;
  color: var(--text) !important;
}

.research-button::after {
  flex-shrink: 0;
  margin-left: 1rem;
}

.research-button-title {
  font-family: var(--body-serif);
  font-size: clamp(1.7rem, 3vw, 3.25rem);
  line-height: 0.95;
  letter-spacing: -0.03em;
}

.research-button-meta {
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  text-align: right;
}

.research-button:hover .research-button-meta,
.research-button:not(.collapsed) .research-button-meta {
  color: rgba(5, 5, 5, 0.8);
}

.research-body {
  padding: 1.2rem 0 1.8rem 0;
  max-width: 62rem;
}

.research-body p {
  margin: 0 0 1rem;
  font-size: 0.88rem;
  line-height: 1.85;
  color: var(--muted);
}

.research-body p:last-child {
  margin-bottom: 0;
}

.back-home {
  position: fixed;
  bottom: 1.25rem;
  left: 1.25rem;
  display: inline-block;
  font-family: "Pinyon Script", cursive;
  font-size: 1.6rem;
  letter-spacing: 0.02em;
  opacity: 0.85;
  z-index: 1000;
  transform-origin: center;
  color: var(--text);
  transition: opacity 180ms ease, transform 180ms ease, color 180ms ease;
}

.back-home:hover {
  opacity: 1;
  transform: translateY(-2px);
  color: var(--red);
}

.back-home.attention {
  animation: backHomePulseJump 1.8s ease-in-out 1;
  will-change: transform, color;
}

@keyframes backHomePulseJump {
  0% {
    transform: translateY(0) scale(1);
    color: var(--text);
  }
  14% {
    transform: translateY(-30px) scale(1.72);
    color: var(--red);
  }
  28% {
    transform: translateY(0) scale(1.28);
    color: var(--red);
  }
  42% {
    transform: translateY(-12px) scale(1.14);
    color: var(--red);
  }
  60% {
    transform: translateY(0) scale(1);
    color: var(--text);
  }
  100% {
    transform: translateY(0) scale(1);
    color: var(--text);
  }
}

@media (max-width: 767.98px) {
  .research-button {
    grid-template-columns: 1fr;
    align-items: start;
    padding: 1.15rem 0.75rem 1.15rem 0;
  }

  .research-button-meta {
    text-align: left;
  }
}

@media (max-width: 575.98px) {
  .nav-row {
    justify-content: center;
    gap: 0.9rem 1.2rem;
  }

  .nav-link-custom {
    font-size: 0.74rem;
    letter-spacing: 0.14em;
  }

  .research-title {
    font-size: clamp(2.6rem, 12vw, 4.8rem);
  }

  .research-button-title {
    font-size: clamp(1.4rem, 7vw, 2.2rem);
  }

  .back-home {
    left: 0.8rem;
    bottom: 0.7rem;
    font-size: 1.45rem;
  }
}