/* causa research — report book */
.causa-report {

  --bg: #fafafc;
  --text: #1a1833;
  --text-dim: #4a4863;
  --text-muted: #7a7893;
  --primary: #6a63b8;
  --primary-soft: #e6e4f7;
  --accent: #6b8f2b;
  --accent-soft: #e7f0d4;
  --border: #d7d5e8;
  --font-serif: "Noto Serif TC", "Songti SC", "STSong", serif;
  --font-sans: "Noto Sans TC", "Hiragino Sans GB", "Microsoft JhengHei", sans-serif;

}


.causa-report, .causa-report * {
 box-sizing: border-box; margin: 0; padding: 0; 
}


.causa-report {

  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;

}


.causa-report .report-toc {

  position: sticky;
  top: 64px;
  z-index: 100;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 0.75rem 1.5rem;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;

}


.causa-report .report-toc a {
 color: var(--text-dim); text-decoration: none; 
}

.causa-report .report-toc a:hover {
 color: var(--primary); 
}


.causa-report .report {

  max-width: 760px;
  margin: 0 auto;
  padding: 2rem 1.5rem 6rem;

}


.causa-report .cover {

  min-height: 90vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 4rem 0 6rem;
  border-bottom: 4px solid var(--primary);
  margin-bottom: 4rem;

}


.causa-report .cover-kicker {
 color: var(--accent); font-weight: 700; letter-spacing: 0.05em; margin-bottom: 1rem; 
}

.causa-report .cover h1 {
 font-family: var(--font-serif); font-size: 3rem; line-height: 1.15; margin-bottom: 1rem; 
}

.causa-report .cover-subtitle {
 font-size: 1.25rem; color: var(--text-dim); margin-bottom: 2rem; 
}

.causa-report .cover-meta {
 color: var(--text-muted); 
}


.causa-report .chapter {
 margin-bottom: 5rem; page-break-before: always; 
}

.causa-report .chapter:first-of-type {
 page-break-before: auto; 
}


.causa-report h2 {

  font-family: var(--font-serif);
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--primary-soft);

}


.causa-report h3 {
 font-size: 1.25rem; color: var(--text); margin: 1.5rem 0 0.75rem; 
}


.causa-report p {
 margin-bottom: 1rem; 
}


.causa-report .lead {
 font-size: 1.15rem; color: var(--text-dim); 
}


.causa-report .key-findings {

  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;

}


.causa-report .kf-card {

  background: var(--primary-soft);
  border-radius: 8px;
  padding: 1rem;
  text-align: center;

}


.causa-report .kf-card strong {
 display: block; font-size: 2rem; color: var(--primary); 
}

.causa-report .kf-card span {
 font-size: 0.85rem; color: var(--text-dim); 
}


.causa-report .summary-cards {

  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;

}


.causa-report .summary-card {

  background: var(--primary-soft);
  border-radius: 8px;
  padding: 1.25rem;
  border-left: 6px solid var(--primary);
  text-align: left;

}


.causa-report .summary-card strong {
 display: block; font-size: 2rem; color: var(--primary); 
}


.causa-report .summary-card span {
 font-size: 0.95rem; color: var(--text-dim); 
}


.causa-report .cta {
 display: inline-block; margin-top: 1.5rem; padding: 0.75rem 1.25rem; background: var(--accent); color: #fff; text-decoration: none; border-radius: 6px; font-weight: bold; 
}


.causa-report .chart {

  width: 100%;
  max-width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border);
  margin: 1.5rem 0 0.5rem;

}


.causa-report .caption {

  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;

}


.causa-report .method-flow {

  width: 100%;
  max-width: 100%;
  margin: 1.5rem 0 0.5rem;

}


.causa-report .three-layers {

  display: grid;
  gap: 1rem;
  margin: 1.5rem 0;

}


.causa-report .layer {
 border-radius: 8px; padding: 1rem; border-left: 6px solid; 
}

.causa-report .layer-a {
 background: var(--accent-soft); border-color: var(--accent); 
}

.causa-report .layer-b {
 background: var(--primary-soft); border-color: var(--primary); 
}

.causa-report .layer-c {
 background: #fff0f0; border-color: #c45; 
}


.causa-report ol, .causa-report ul {
 margin: 1rem 0 1rem 1.5rem; 
}

.causa-report li {
 margin-bottom: 0.5rem; 
}


.causa-report .report-footer {

  text-align: center;
  padding: 3rem 1.5rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  font-size: 0.85rem;

}


@media print {

  .causa-report .report-toc {
 display: none; 
}

  .causa-report .chapter {
 page-break-before: always; 
}

  .causa-report .cover {
 min-height: auto; 
}

  .causa-report {
 font-size: 11pt; 
}

}


@media (prefers-color-scheme: dark) {

  .causa-report {

    --bg: #0d0b1a;
    --text: #f0f0f5;
    --text-dim: #c8c6d4;
    --text-muted: #8f8aa3;
    --border: #2b2766;
  
}

  .causa-report .report-toc {
 background: rgba(13,11,26,0.92); 
}

  .causa-report .chart {
 border-color: #2b2766; 
}

}


/* inff theme toggle dark mode */
[data-mode=dark] .causa-report {
  --bg: #0d0b1a;
  --text: #f0f0f5;
  --text-dim: #c8c6d4;
  --text-muted: #8f8aa3;
  --border: #2b2766;
}

[data-mode=dark] .causa-report .report-toc {
  background: rgba(13,11,26,0.92);
}

[data-mode=dark] .causa-report .chart {
  border-color: #2b2766;
}

.causa-report {
  min-height: 100%;
}


/* Hugo site theme toggle uses data-theme on <html> */
html[data-theme="dark"] .causa-report {
  --bg: #0d0b1a;
  --text: #f0f0f5;
  --text-dim: #c8c6d4;
  --text-muted: #8f8aa3;
  --primary: #8078E8;
  --primary-soft: rgba(128, 120, 232, 0.12);
  --accent: #8CBF3F;
  --accent-soft: rgba(140, 191, 63, 0.12);
  --border: #2b2766;
}


html[data-theme="dark"] .causa-report .report-toc {
  background: rgba(13,11,26,0.92);
}


html[data-theme="dark"] .causa-report .chart {
  border-color: #2b2766;
}