/* ═══════════════════════════════════════════════
   VAS · Chapter Shell · 章節頁共用骨架
   - chapter-header · 章節標頭
   - toc · 章目錄
   - section · 小節
   - passage · 章末過場
   ═══════════════════════════════════════════════ */

/* ─── Chapter Header · 章節標頭 ──────────────
   和 site-nav 不重疊——nav 在最頂，此頭在 nav 之下
   ─────────────────────────────────────── */
.chapter-header {
  padding: 72px 48px 64px;
  max-width: 1040px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 48px;
  border-bottom: 1px solid var(--vas-rule);
}
.chapter-no {
  font-family: var(--vas-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--vas-ash-3);
  padding-top: 12px;
  position: relative;
}
.chapter-name {
  font-family: var(--vas-serif);
  font-weight: 300;
  font-size: clamp(40px, 6vw, 72px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--vas-ash-0);
  margin-bottom: 24px;
}
.chapter-name em {
  font-style: normal;
  font-weight: 500;
}
.chapter-dek {
  font-family: var(--vas-serif);
  font-size: 17px;
  line-height: 1.95;
  color: var(--vas-ash-1);
  max-width: 44ch;
}
.chapter-dek em {
  font-style: normal;
  font-weight: 600;
  background: linear-gradient(180deg, transparent 62%, rgba(196, 113, 245, 0.22) 62%);
  padding: 0 0.1em;
}

/* 彩蛋 · 第二顆光點（只出現在 Chapter III）
   由宰相在 ch3 頁面加 class="chapter-no has-trail" 啟用 */
.chapter-no.has-trail::after {
  content: '';
  position: absolute;
  top: 4px; right: -12px;
  width: 4px; height: 4px; border-radius: 50%;
  background: var(--vas-aurora-violet);
  opacity: 0.4;
  transition: opacity .4s;
}
.chapter-no.has-trail:hover::after { opacity: 0.8; }

/* ─── TOC · 章目錄 ─────────────────────── */
.toc {
  padding: 40px 48px 32px;
  max-width: 1040px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 48px;
  border-bottom: 1px solid var(--vas-rule);
}
.toc-label {
  font-family: var(--vas-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--vas-ash-3);
  padding-top: 8px;
}
.toc-list {
  list-style: none;
  padding: 0; margin: 0;
}
.toc-list li {
  border-bottom: 1px solid var(--vas-rule);
}
.toc-list li:last-child { border-bottom: none; }
.toc-list a {
  display: grid;
  grid-template-columns: 60px 1fr auto;
  gap: 24px;
  padding: 14px 0;
  align-items: baseline;
  transition: background .3s;
}
.toc-list a:hover {
  background: rgba(240, 232, 220, 0.015);
}
.toc-list .no {
  font-family: var(--vas-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--vas-ash-2);
  transition: color .3s;
}
.toc-list a:hover .no { color: var(--vas-aurora-violet); }
.toc-list .name {
  font-family: var(--vas-serif);
  font-size: 17px;
  font-weight: 400;
  color: var(--vas-ash-0);
  letter-spacing: 0.01em;
  transition: transform .4s cubic-bezier(.2, .8, .2, 1);
}
.toc-list a:hover .name { transform: translateX(4px); }
.toc-list .preview {
  font-family: var(--vas-serif);
  font-size: 14px;
  color: var(--vas-ash-2);
  max-width: 40ch;
  text-align: right;
}

/* ─── Section · 小節 ──────────────────── */
.section {
  padding: 80px 48px;
  max-width: 1040px;
  margin: 0 auto;
  border-bottom: 1px solid var(--vas-rule);
  scroll-margin-top: 40px;
}
.section-head {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 48px;
  align-items: start;
  margin-bottom: 40px;
}
.section-no {
  font-family: var(--vas-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--vas-ash-3);
  padding-top: 12px;
}
.section-name {
  font-family: var(--vas-serif);
  font-weight: 500;
  font-size: clamp(26px, 3.2vw, 36px);
  line-height: 1.45;
  letter-spacing: -0.005em;
  color: var(--vas-ash-0);
  margin-bottom: 8px;
}
.section-kicker {
  font-family: var(--vas-serif);
  font-size: 15px;
  line-height: 1.8;
  color: var(--vas-ash-1);
  max-width: 56ch;
}
.section-body {
  margin-left: 128px; /* 80px no + 48px gap，讓正文和 name 對齊 */
  max-width: 28em;
  font-family: var(--vas-serif);
  font-size: 17px;
  line-height: 1.95;
  color: var(--vas-ash-0);
}
.section-body p + p { margin-top: 1.4em; }
.section-fn { font-size: 12px; color: var(--vas-ash-3); margin-top: 2em; font-family: var(--vas-mono); letter-spacing: 0.04em; }
.section-body em {
  font-style: normal;
  font-weight: 600;
  background: linear-gradient(180deg, transparent 62%, rgba(196, 113, 245, 0.22) 62%);
  padding: 0 0.1em;
}

/* ─── Passage · 章末過場（翻頁感，不是按鈕）── */
.passage {
  padding: 120px 48px 100px;
  max-width: 1040px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 48px;
  border-top: 1px solid var(--vas-rule);
}
.passage-colophon {
  font-family: var(--vas-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--vas-ash-2);
  line-height: 2;
  padding-top: 8px;
}
.passage-colophon .faint {
  color: var(--vas-ash-3);
  font-size: 10px;
}
.passage-body {
  display: flex;
  flex-direction: column;
  gap: 48px;
}
.passage .chronicle-line {
  height: 1px;
  background: linear-gradient(90deg,
    transparent 0%,
    var(--vas-ash-2) 30%,
    var(--vas-aurora-violet) 50%,
    var(--vas-ash-2) 70%,
    transparent 100%);
}
.passage-next {
  display: grid;
  grid-template-columns: 180px 1fr auto;
  gap: 32px;
  padding: 24px 0;
  align-items: baseline;
  transition: background .3s;
}
.passage-next:hover {
  background: rgba(240, 232, 220, 0.015);
}
.passage-next .num {
  font-family: var(--vas-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--vas-ash-3);
  transition: color .3s;
}
.passage-next:hover .num { color: var(--vas-aurora-violet); }
.passage-next .name {
  font-family: var(--vas-serif);
  font-size: 26px;
  font-weight: 500;
  color: var(--vas-ash-0);
  letter-spacing: 0.01em;
  transition: transform .4s cubic-bezier(.2, .8, .2, 1);
}
.passage-next:hover .name { transform: translateX(4px); }
.passage-next .arrow {
  font-family: var(--vas-serif);
  font-size: 24px;
  color: var(--vas-ash-2);
  line-height: 1;
  transition: color .3s, transform .4s cubic-bezier(.2, .8, .2, 1);
}
.passage-next:hover .arrow {
  color: var(--vas-aurora-violet);
  transform: translateX(4px);
}

/* ─── 頁尾 · 所有 chapter 頁共用 ────────── */
.site-footer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 48px;
  align-items: end;
  padding: 56px 48px 40px;
  max-width: 1040px;
  margin: 0 auto;
  border-top: 1px solid var(--vas-rule);
}

/* ─── 行動斷點 ────────────────────────── */
@media (max-width: 768px) {
  .chapter-header,
  .toc,
  .passage {
    grid-template-columns: 1fr;
    gap: 16px;
    padding-left: 24px;
    padding-right: 24px;
  }
  .chapter-header { padding-top: 72px; padding-bottom: 48px; }
  .toc            { padding: 40px 24px; }
  .passage        { padding-top: 72px; padding-bottom: 64px; }

  .section {
    padding: 56px 24px;
  }
  .section-head { grid-template-columns: 1fr; gap: 8px; }
  .section-body { margin-left: 0; }

  .toc-list a { grid-template-columns: 40px 1fr; }
  .toc-list .preview { display: none; }  /* mobile 隱藏章節預覽 */

  .passage-next {
    grid-template-columns: 1fr auto;
    gap: 16px;
  }
  .passage-next .num { grid-column: 1 / -1; margin-bottom: -8px; }

  .site-footer {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 40px 24px 32px;
  }
  .site-footer .footer-right { text-align: left; }
}

/* ─── Dot Nav · 右側段落指示器 ──────────────
   position: fixed · 桌面專用（手機隱藏）
   ─────────────────────────────────────── */
.dot-nav {
  position: fixed;
  right: 28px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 28px;
  z-index: 40;
}
.dot-nav-item {
  position: relative;
  display: flex;
  align-items: center;
  text-decoration: none;
}
.dn-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: transparent;
  border: 1px solid var(--vas-ash-3);
  flex-shrink: 0;
  transition: background .25s, transform .25s, box-shadow .25s, border-color .25s;
}
.dn-label {
  position: absolute;
  right: 14px;
  font-family: var(--vas-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--vas-ash-1);
  white-space: nowrap;
  opacity: 0;
  transform: translateX(6px);
  transition: opacity .2s, transform .2s;
  pointer-events: none;
}
.dot-nav-item:hover .dn-label {
  opacity: 1;
  transform: translateX(0);
}
.dot-nav-item.is-visited .dn-dot {
  background: var(--vas-ash-3);
  border-color: var(--vas-ash-3);
}
.dot-nav-item.is-current .dn-dot {
  background: var(--vas-aurora-violet);
  border-color: var(--vas-aurora-violet);
  transform: scale(1.6);
  box-shadow: 0 0 8px rgba(196, 113, 245, 0.45);
}
.dot-nav-item.is-current .dn-label {
  opacity: 1;
  transform: translateX(0);
  color: var(--vas-aurora-violet);
}
.dot-nav-item.is-visited .dn-label {
  color: var(--vas-ash-2);
}
.dot-nav-trigger {
  display: none;
  position: fixed;
  top: 90px;
  right: 20px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--vas-ash-1);
  border: none;
  cursor: pointer;
  z-index: 60;
  padding: 0;
  animation: vas-breathe 2.8s ease-in-out infinite;
}
@keyframes vas-breathe {
  0%, 100% { opacity: 0.35; box-shadow: 0 0 4px 1px rgba(240,232,220,0.15); }
  50%       { opacity: 0.85; box-shadow: 0 0 12px 4px rgba(240,232,220,0.35); }
}
@media (max-width: 960px) {
  .dot-nav-trigger { display: block; }
  .dot-nav {
    display: none;
    position: fixed;
    top: 100px;
    right: 16px;
    transform: none;
    background: rgba(14,11,26,0.96);
    border: 1px solid var(--vas-rule);
    border-radius: 10px;
    padding: 20px 24px;
    gap: 20px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 55;
  }
  .dot-nav.is-open { display: flex; }
  .dot-nav-item { flex-direction: row-reverse; gap: 10px; }
  .dn-label {
    position: static;
    opacity: 1 !important;
    transform: none !important;
    font-size: 11px;
    pointer-events: none;
  }
  .dot-nav-item.is-current .dn-label { color: var(--vas-aurora-violet); }
}