/* Minimal Tufte-inspired styles for academic blog */
:root {
  /* Warm, paper-like background and tones */
  --body: #fcf9ef;   /* light cream paper */
  --ink: #241811;
  --muted: #6e5c4e;
  --rule: #e8ddc5;  /* warmer rule to match paper */
  --accent: #7c0801;
  --link: #8f1400;
}

html { font-size: 16px; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--body);
  font-family: et-book, Palatino, "Palatino Linotype", "Book Antiqua", Georgia, serif;
  line-height: 1.6;
}

header { padding: 0.6rem 0 0; }
nav.group {
  max-width: 900px; margin: 0 auto; padding: 0 1rem;
  display: flex; gap: 1rem; align-items: baseline;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 0.55rem 1rem 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.75rem;
}
nav.group a { color: var(--accent); text-decoration: none; font-weight: 500; }
nav.group a.active { font-weight: 600; }
nav.group a:hover,
nav.group a:focus { color: var(--ink); }
nav.group .icon-link {
  text-transform: none;
  letter-spacing: 0;
  font-size: 0;
}

/* Subtle CTA button for Lab link */
.spacer { flex: 1 1 auto; }
.btn-lab {
  display: inline-block;
  padding: 0.1rem 0.2rem;
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}
.btn-lab:hover { text-decoration: underline; }

/* Icon links */
.icon-link { display: inline-flex; align-items: center; gap: 0.35rem; font-size: 0; }
.icon { width: 18px; height: 18px; fill: currentColor; display: block; }

article.group {
  max-width: 900px; margin: 2rem auto; padding: 0 1rem;
  font-size: 1.05rem;
}

h1 { font-weight: 400; font-size: 2rem; margin: 0 0 1rem; letter-spacing: 0.02em; }
h1 .subtitle { font-size: 1.1rem; color: var(--muted); }
h2 {
  font-weight: 400;
  font-size: 1.5rem;
  margin: 0.2rem 0 0.2rem;
  color: var(--link);
}
p { margin: 0.6rem 0; }

ul.content-listing { list-style: none; padding: 0; margin: 1.5rem 0; }
ul.content-listing li {
  margin: 0 0 1.9rem 0;
  padding-left: 1.8rem;
  position: relative;
}
ul.content-listing li::before {
  content: "•";
  color: var(--link);
  position: absolute;
  left: 0.2rem;
  top: 0.35rem;
  font-size: 1.5rem;
  font-weight: 400;
}

hr { border: none; border-top: 1px solid var(--rule); margin: 2rem 0; }
hr.invisible { border: none; margin: 0.8rem 0; }
hr.slender { border-top: 1px solid var(--rule); margin: 1.5rem 0; }

.credits { max-width: 900px; margin: 0 auto; padding: 0 1rem 2rem; color: var(--muted); }
.print-footer { display: none; }

/* Sidenotes */
.margin-toggle { display: none; }
.sidenote {
  float: right; clear: right; margin-right: -45%; width: 40%;
  margin-top: 0.3rem; font-size: 0.9rem; color: var(--muted);
}

@media (max-width: 980px) {
  .sidenote { float: none; clear: none; margin: 0.5rem 0; width: auto; margin-right: 0; }
}

/* Article body */
article.post { max-width: 900px; margin: 2rem auto; padding: 0 1rem; }
article.post header { border-bottom: 1px solid var(--rule); padding-bottom: 0.6rem; margin-bottom: 1rem; }
article.post time { color: var(--muted); font-size: 0.95rem; }
.post-diagram {
  margin: 1.6rem auto 1.6rem;
  max-width: 780px;
}
.post-diagram img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
  box-shadow: 0 12px 30px rgba(0,0,0,0.08);
}
.post-diagram.diagram-pair {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  justify-content: center;
  align-items: flex-start;
  margin: 2rem auto;
}
.post-diagram.diagram-pair img {
  flex: 1 1 260px;
  width: auto;
  max-width: 360px;
  min-width: 200px;
}
.post-diagram.diagram-pair img.relaxed-left {
  max-width: 420px;
  border-radius: 14px;
  padding: 10px;
  background: #fafafa;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}
.image-note {
  max-width: 780px;
  margin: -0.3rem auto 1.6rem;
  color: var(--muted);
  font-size: 0.95rem;
  text-align: center;
}

@media (max-width: 900px) {
  .post-diagram.diagram-pair {
    flex-direction: column;
    align-items: center;
  }
  .post-diagram.diagram-pair img,
  .post-diagram.diagram-pair img.relaxed-left {
    width: 100%;
    max-width: 100%;
    min-width: 0;
  }
}

a { color: var(--link); }
a:hover { text-decoration: underline; text-decoration-color: var(--link); }

/* About page tweaks */
article.group.about {
  position: relative;
}
article.group.about::after {
  content: "";
  display: block;
  clear: both;
}
.about-photo {
  float: right;
  width: 210px;
  margin: 0.2rem 0 1.5rem 3rem;
  text-align: right;
  font-size: 0.85rem;
  color: var(--muted);
}
.about-photo img {
  width: 100%;
  height: 230px;
  object-fit: cover;
  object-position: center;
  border-radius: 18px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.08);
}
.about-photo figcaption {
  margin-top: 0.3rem;
  color: var(--link);
}
.about-list {
  list-style: none;
  margin: 0 0 1.6rem;
  padding-left: 1.6rem;
}
.about-list li {
  margin-bottom: 0.9rem;
  position: relative;
}
.about-list li::before {
  content: "•";
  color: var(--link);
  position: absolute;
  left: -1.2rem;
  top: 0.2rem;
}

@media (max-width: 720px) {
  .about-photo { float: none; margin: 0 auto 1.5rem; }
}

/* Acknowledgments Section - Featured Subpage Styling */
.acknowledgment-header {
  margin-top: 4rem;
  padding-top: 2.5rem;
  border-top: 3px double var(--accent);
  position: relative;
  text-align: center;
  font-size: 2.2rem;
  color: var(--accent);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 400;
}

.acknowledgment-header::before {
  content: "✦ ✦ ✦";
  position: absolute;
  top: -1rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--body);
  padding: 0 2rem;
  color: var(--accent);
  font-size: 1rem;
  letter-spacing: 0.8rem;
}

.acknowledgment-header::after {
  content: "";
  display: block;
  width: 120px;
  height: 3px;
  background: linear-gradient(to right, transparent, var(--accent), transparent);
  margin: 1rem auto 0;
}

.acknowledgment-section {
  background: linear-gradient(135deg,
    rgba(252, 249, 239, 0.95) 0%,
    rgba(255, 250, 240, 1) 50%,
    rgba(252, 249, 239, 0.95) 100%);
  padding: 3rem;
  margin: 2rem -3rem;
  border: 2px solid var(--accent);
  border-radius: 12px;
  box-shadow:
    0 8px 24px rgba(124, 8, 1, 0.12),
    0 2px 8px rgba(124, 8, 1, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 0.8);
  position: relative;
}

.acknowledgment-section::before {
  content: "";
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--link) 100%);
  border-radius: 12px;
  z-index: -1;
  opacity: 0.15;
}

.acknowledgment-intro {
  font-size: 1.3rem;
  font-style: italic;
  color: var(--ink);
  margin-bottom: 2rem;
  text-align: center;
  font-weight: 300;
  line-height: 1.8;
  padding: 0 1rem;
}

.mentor-highlight {
  background: linear-gradient(to bottom,
    rgba(255, 255, 255, 0.9) 0%,
    rgba(255, 255, 255, 0.95) 100%);
  padding: 2.5rem;
  border-radius: 10px;
  margin: 2rem 0;
  box-shadow:
    0 12px 28px rgba(0, 0, 0, 0.08),
    0 4px 12px rgba(124, 8, 1, 0.06),
    inset 0 1px 0 rgba(255, 255, 255, 1);
  border: 1px solid rgba(124, 8, 1, 0.2);
  position: relative;
  overflow: hidden;
}

.mentor-highlight::before {
  content: """;
  position: absolute;
  top: -20px;
  left: 20px;
  font-size: 120px;
  color: rgba(124, 8, 1, 0.06);
  font-family: Georgia, serif;
  line-height: 1;
  z-index: 0;
}

.mentor-highlight::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 5px;
  height: 100%;
  background: linear-gradient(to bottom, var(--accent), var(--link));
}

.mentor-highlight strong {
  color: var(--accent);
  font-size: 1.25rem;
  letter-spacing: 0.02em;
  display: inline-block;
  position: relative;
  z-index: 1;
  text-shadow: 0 1px 2px rgba(255, 255, 255, 0.8);
}

.mentor-highlight p {
  margin: 1.2rem 0;
  line-height: 1.85;
  position: relative;
  z-index: 1;
  color: var(--ink);
  font-size: 1.05rem;
}

.gratitude {
  margin-top: 2rem;
  padding: 1.2rem 1.5rem;
  font-style: italic;
  color: var(--accent);
  background: rgba(124, 8, 1, 0.03);
  border-left: 4px solid var(--accent);
  border-radius: 0 6px 6px 0;
  font-size: 1.08rem;
  box-shadow: inset 0 1px 3px rgba(124, 8, 1, 0.05);
}

.acknowledgment-close {
  margin-top: 2rem;
  font-size: 1.08rem;
  text-align: center;
  padding: 1.5rem;
  background: rgba(124, 8, 1, 0.02);
  border-radius: 8px;
  border: 1px dashed var(--accent);
  color: var(--ink);
}

.acknowledgment-close strong {
  color: var(--link);
  font-weight: 600;
  font-size: 1.12rem;
}

@media (max-width: 720px) {
  .acknowledgment-header {
    font-size: 1.6rem;
  }

  .acknowledgment-section {
    margin: 2rem -1rem;
    padding: 2rem 1.5rem;
  }

  .mentor-highlight {
    padding: 1.8rem 1.2rem;
  }

  .mentor-highlight::before {
    font-size: 80px;
    top: -10px;
    left: 10px;
  }

  .acknowledgment-intro {
    font-size: 1.1rem;
    padding: 0;
  }

  .gratitude {
    padding: 1rem;
  }

  .acknowledgment-close {
    padding: 1.2rem;
  }
}