/* ═══════════════════════════════════════════════
   VERSION B — Academic Modern
   純白 + 深藍灰 + 銅金點綴
   水平滑動卡片、時間軸索引、清晰學術感
═══════════════════════════════════════════════ */

:root {
  --B-ink: #0e1a2b;
  --B-ink-2: #2a3a52;
  --B-ink-3: #586478;
  --B-ink-4: #9aa3b0;
  --B-paper: #ffffff;
  --B-paper-2: #f4f6fa;
  --B-line: #e3e7ee;
  --B-line-2: #eef1f6;
  --B-accent: #b08a4a;
  --B-accent-2: #8b6a2f;

  --B-serif: "Playfair Display", "Noto Serif TC", "Songti TC", serif;
  --B-sans: "Inter", "Noto Sans TC", -apple-system, sans-serif;
  --B-mono: "JetBrains Mono", ui-monospace, monospace;
}

.acadB, .acadB * { box-sizing: border-box; margin: 0; padding: 0; }
.acadB {
  background: var(--B-paper);
  color: var(--B-ink);
  font-family: var(--B-sans);
  font-size: 16px;
  line-height: 1.65;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
.acadB a { color: inherit; text-decoration: none; }

/* ── 頂部 — 純白 Logo 區（保持比例 718:216） ────── */
.acadB .nav {
  background: var(--B-paper);
  border-bottom: 1px solid var(--B-line);
  position: sticky;
  top: 0;
  z-index: 50;
}
.acadB .nav-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}
.acadB .nav-logo {
  display: flex;
  align-items: center;
  gap: 18px;
}
.acadB .nav-logo img {
  height: 50px;
  width: auto;
  display: block;
}
.acadB .nav-logo .class-badge {
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--B-line);
  padding-left: 18px;
  line-height: 1.2;
}
.acadB .nav-logo .class-badge .cb-en {
  font-family: var(--B-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--B-accent);
  text-transform: uppercase;
}
.acadB .nav-logo .class-badge .cb-zh {
  font-family: var(--B-serif);
  font-size: 18px;
  font-weight: 500;
  color: var(--B-ink);
  letter-spacing: -0.005em;
  margin-top: 2px;
}

/* 班級識別細條（深色，類似刊物 banner） */
.acadB .class-banner {
  background: var(--B-ink);
  color: #ffffff;
  padding: 9px 48px;
  font-family: var(--B-mono);
  font-size: 10px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
}
.acadB .class-banner-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.acadB .class-banner .bn-gold { color: var(--B-accent); }
.acadB .nav-links {
  display: flex;
  gap: 36px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--B-ink-2);
}
.acadB .nav-links a { padding: 4px 0; transition: color .15s ease; }
.acadB .nav-links a:hover { color: var(--B-accent); }
.acadB .nav-links .nav-refresh {
  background: none;
  border: 1px solid var(--B-line);
  color: var(--B-ink-2);
  padding: 6px 12px;
  font-size: 12px;
  letter-spacing: 0.04em;
  font-family: inherit;
  cursor: pointer;
  border-radius: 2px;
  transition: border-color .2s ease, color .2s ease;
}
.acadB .nav-links .nav-refresh:hover:not(:disabled) {
  border-color: var(--B-accent);
  color: var(--B-accent);
}
.acadB .nav-links .nav-refresh:disabled { cursor: default; opacity: 0.6; }

/* ── 主視覺 ──────────────────────────────── */
.acadB .heroB {
  padding: 96px 48px 80px;
  max-width: 1400px;
  margin: 0 auto;
  border-bottom: 1px solid var(--B-line);
}
.acadB .heroB-eyebrow {
  font-family: var(--B-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--B-accent-2);
  margin-bottom: 36px;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 16px;
}
.acadB .heroB-eyebrow::before {
  content: "";
  display: block;
  width: 40px;
  height: 1px;
  background: var(--B-accent);
}
.acadB .heroB h1 {
  font-family: var(--B-serif);
  font-size: clamp(48px, 7vw, 96px);
  line-height: 1.05;
  font-weight: 500;
  letter-spacing: -0.015em;
  color: var(--B-ink);
  margin-bottom: 32px;
  max-width: 1100px;
}
.acadB .heroB h1 .gold {
  color: var(--B-accent);
  font-style: italic;
}
.acadB .heroB-bottom {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 64px;
  margin-top: 24px;
}
.acadB .heroB-deck {
  font-size: 18px;
  line-height: 1.7;
  color: var(--B-ink-2);
  max-width: 580px;
}
.acadB .heroB-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--B-line);
  border: 1px solid var(--B-line);
  align-self: end;
}
.acadB .heroB-stat {
  background: var(--B-paper);
  padding: 22px 24px;
}
.acadB .heroB-stat .num {
  font-family: var(--B-serif);
  font-size: 40px;
  line-height: 1;
  font-weight: 500;
  color: var(--B-ink);
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}
.acadB .heroB-stat .lbl {
  font-family: var(--B-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--B-ink-3);
  text-transform: uppercase;
}

/* ── 索引導覽帶（Timeline Index） ────────────── */
.acadB .index-bar {
  max-width: 1400px;
  margin: 0 auto;
  padding: 56px 48px 0;
}
.acadB .index-bar-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 32px;
}
.acadB .index-bar-head h2 {
  font-family: var(--B-serif);
  font-size: 36px;
  font-weight: 500;
  letter-spacing: -0.005em;
  color: var(--B-ink);
}
.acadB .index-bar-head .count {
  font-family: var(--B-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--B-ink-3);
  text-transform: uppercase;
}

/* 時間軸刻度 */
.acadB .timeline {
  position: relative;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0;
  padding: 24px 0 56px;
  border-bottom: 1px solid var(--B-line);
  margin-bottom: 56px;
}
.acadB .timeline::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--B-line);
}
.acadB .tl-tick {
  position: relative;
  text-align: left;
  padding: 0 12px 0 0;
  cursor: pointer;
  transition: transform .2s ease;
}
.acadB .tl-tick::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 1px;
  height: 24px;
  background: var(--B-ink-3);
  transform-origin: bottom;
  transition: height .25s ease, background .25s ease;
}
.acadB .tl-tick:hover::before {
  height: 40px;
  background: var(--B-accent);
}
.acadB .tl-tick:hover .tl-num { color: var(--B-accent); }
.acadB .tl-num {
  font-family: var(--B-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--B-ink-3);
  margin-bottom: 6px;
  transition: color .25s ease;
}
.acadB .tl-date {
  font-family: var(--B-serif);
  font-size: 18px;
  font-weight: 500;
  color: var(--B-ink);
  margin-bottom: 4px;
  letter-spacing: -0.005em;
}
.acadB .tl-name {
  font-size: 12px;
  color: var(--B-ink-2);
  line-height: 1.4;
}

/* ── 索引列表（精簡） ─────────────────────── */
.acadB .indexlist {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 48px;
}
.acadB .indexlist-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding-bottom: 20px;
  border-bottom: 2px solid var(--B-ink);
  margin-bottom: 0;
}
.acadB .indexlist-head h2 {
  font-family: var(--B-serif);
  font-size: 36px;
  font-weight: 500;
  letter-spacing: -0.005em;
  color: var(--B-ink);
}
.acadB .indexlist-head .right {
  font-family: var(--B-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--B-ink-3);
  text-transform: uppercase;
}
.acadB .ix-row {
  display: grid;
  grid-template-columns: 60px 130px 1fr 220px 200px 32px;
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--B-line);
  align-items: center;
  cursor: pointer;
  transition: background .15s ease, padding .25s ease;
  position: relative;
}
.acadB .ix-row:hover {
  background: var(--B-paper-2);
  padding-left: 16px;
  padding-right: 16px;
}
.acadB .ix-row:hover .ix-arrow { color: var(--B-accent); transform: translateX(4px); }
.acadB .ix-row:hover .ix-name { color: var(--B-accent); }
.acadB .ix-num {
  font-family: var(--B-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--B-ink-3);
}
.acadB .ix-date {
  font-family: var(--B-mono);
  font-size: 13px;
  color: var(--B-ink-2);
  letter-spacing: 0.06em;
}
.acadB .ix-name {
  font-family: var(--B-serif);
  font-size: 22px;
  font-weight: 500;
  color: var(--B-ink);
  letter-spacing: -0.005em;
  transition: color .2s ease;
  line-height: 1.25;
}
.acadB .ix-loc {
  font-size: 13px;
  color: var(--B-ink-3);
}
.acadB .ix-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.acadB .ix-tags .tag {
  font-size: 10px;
  letter-spacing: 0.06em;
  padding: 3px 8px;
  border: 1px solid var(--B-line);
  background: var(--B-paper);
  color: var(--B-ink-2);
  border-radius: 2px;
}
.acadB .ix-arrow {
  font-family: var(--B-mono);
  font-size: 16px;
  color: var(--B-ink-3);
  transition: color .2s ease, transform .2s ease;
  text-align: right;
}

/* ── 卡片網格區（特色項目） ───────────────────── */
.acadB .featured {
  max-width: 1400px;
  margin: 96px auto 0;
  padding: 0 48px;
}
.acadB .featured-head {
  display: flex;
  align-items: baseline;
  gap: 20px;
  padding-bottom: 24px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--B-line);
}
.acadB .featured-head .gold-mark {
  font-family: var(--B-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--B-accent);
  text-transform: uppercase;
}
.acadB .featured-head h2 {
  font-family: var(--B-serif);
  font-size: 32px;
  font-weight: 500;
  letter-spacing: -0.005em;
  color: var(--B-ink);
}
.acadB .featured-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 24px;
}
.acadB .feat-card {
  background: var(--B-paper);
  cursor: pointer;
  transition: transform .3s ease;
  display: flex;
  flex-direction: column;
}
.acadB .feat-card:hover { transform: translateY(-3px); }
.acadB .feat-card:hover .feat-name { color: var(--B-accent); }
.acadB .feat-card .feat-img {
  aspect-ratio: 16 / 11;
  margin-bottom: 18px;
  overflow: hidden;
  position: relative;
}
.acadB .feat-card.lead .feat-img { aspect-ratio: 16 / 13; }
.acadB .feat-card .feat-num {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(255,255,255,0.95);
  font-family: var(--B-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  padding: 5px 10px;
  color: var(--B-ink);
  z-index: 2;
}
.acadB .feat-card .feat-eyebrow {
  font-family: var(--B-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--B-accent-2);
  margin-bottom: 8px;
  text-transform: uppercase;
}
.acadB .feat-card .feat-name {
  font-family: var(--B-serif);
  font-size: 24px;
  font-weight: 500;
  letter-spacing: -0.005em;
  color: var(--B-ink);
  margin-bottom: 10px;
  line-height: 1.2;
  transition: color .2s ease;
}
.acadB .feat-card.lead .feat-name { font-size: 32px; }
.acadB .feat-card .feat-meta {
  font-size: 12px;
  color: var(--B-ink-3);
  display: flex;
  gap: 10px;
}
.acadB .feat-card .feat-meta .dot { width: 3px; height: 3px; border-radius: 50%; background: var(--B-ink-4); align-self: center; }

/* 佔位 */
.acadB .ph {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.acadB .ph::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(135deg,
    transparent 0, transparent 12px,
    rgba(0,0,0,0.025) 12px, rgba(0,0,0,0.025) 24px);
}
.acadB .ph .ph-lbl {
  position: relative;
  font-family: var(--B-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  color: var(--B-ink-3);
  background: rgba(255,255,255,0.92);
  padding: 5px 10px;
  border: 1px solid var(--B-line);
  text-transform: uppercase;
}
.acadB .ph-tsmc { background: linear-gradient(135deg, #e1e8ec 0%, #c9d4dc 100%); }
.acadB .ph-delta { background: linear-gradient(135deg, #e3e8de 0%, #c8d3bd 100%); }
.acadB .ph-chimei { background: linear-gradient(135deg, #ece4d8 0%, #d6c4a8 100%); }
.acadB .ph-unipres { background: linear-gradient(135deg, #ecdfd8 0%, #d4b8a8 100%); }
.acadB .ph-catcher { background: linear-gradient(135deg, #e3e3e8 0%, #c8c8d2 100%); }
.acadB .ph-textile { background: linear-gradient(135deg, #e8d6dc 0%, #c8a6b3 100%); }
.acadB .ph-otherworld { background: linear-gradient(135deg, #f3e0dc 0%, #d8a89a 100%); }

/* ═══════════════════════════════════════════════
   Lightbox / Upload / Gallery Empty — production additions
═══════════════════════════════════════════════ */

/* Detail page gallery — 真實圖片版 + 封面選擇 */
.acadB .detB-gallery-grid .gitem {
  background: var(--B-paper-2);
  padding: 0;
  border: 1px solid var(--B-line);
  overflow: hidden;
  position: relative;
  aspect-ratio: 4 / 3;
  transition: border-color .2s ease;
}
.acadB .detB-gallery-grid .gitem.is-cover {
  border-color: var(--B-accent);
  border-width: 2px;
}
.acadB .detB-gallery-grid .gitem-img {
  display: block;
  width: 100%;
  height: 100%;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}
.acadB .detB-gallery-grid .gitem img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
/* 封面照片 — 縮圖上加金色「★ 封面」標籤 */
.acadB .detB-gallery-grid .gitem .gnum-cover {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--B-accent);
  color: #fff;
  font-family: var(--B-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  padding: 3px 8px;
  border-radius: 10px;
  z-index: 2;
}

/* Lightbox 內的「設為封面」按鈕 */
.lb-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.lb-cover-btn {
  background: rgba(255,255,255,0.12);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.35);
  padding: 11px 18px;
  font-size: 13px;
  font-family: inherit;
  letter-spacing: 0.06em;
  border-radius: 4px;
  cursor: pointer;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}
.lb-cover-btn:hover:not(:disabled) {
  background: #fff;
  color: var(--B-ink);
  border-color: #fff;
}
.lb-cover-btn.is-cover {
  background: var(--B-accent);
  border-color: var(--B-accent);
  color: #fff;
  cursor: default;
}
.lb-cover-btn:disabled { cursor: default; }
.acadB .gallery-empty {
  padding: 64px 0;
  text-align: center;
  color: var(--B-ink-3);
  font-size: 15px;
}
.acadB .gallery-empty .link-btn {
  background: none;
  border: none;
  color: var(--B-accent);
  cursor: pointer;
  font-size: inherit;
  border-bottom: 1px solid var(--B-accent);
  padding: 0 2px;
}

/* 上傳按鈕（Detail header） */
.acadB .upload-trigger {
  background: var(--B-ink);
  color: #fff;
  border: none;
  padding: 9px 16px;
  font-size: 12px;
  letter-spacing: 0.06em;
  cursor: pointer;
  border-radius: 2px;
  transition: background .2s ease;
}
.acadB .upload-trigger:hover { background: var(--B-accent); }

/* Lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(14, 26, 43, 0.94);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px;
  animation: lbFade .2s ease;
}
@keyframes lbFade {
  from { opacity: 0; }
  to { opacity: 1; }
}
.lb-close {
  position: absolute;
  top: 20px;
  right: 28px;
  background: none;
  border: none;
  color: #fff;
  font-size: 32px;
  cursor: pointer;
  line-height: 1;
  z-index: 2;
}
.lb-nav {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.2);
  color: #fff;
  font-size: 32px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  cursor: pointer;
  flex-shrink: 0;
  transition: background .2s ease;
}
.lb-nav:hover:not(:disabled) { background: rgba(255,255,255,0.18); }
.lb-nav:disabled { opacity: 0.25; cursor: not-allowed; }
.lb-stage {
  flex: 1;
  max-width: calc(100% - 160px);
  max-height: 92vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}
.lb-stage img {
  max-width: 100%;
  max-height: calc(92vh - 60px);
  object-fit: contain;
  background: #000;
}
.lb-meta {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #fff;
  font-size: 13px;
  letter-spacing: 0.04em;
  gap: 24px;
}
.lb-meta-left { display: flex; gap: 16px; align-items: center; }
.lb-uploader { font-family: "Playfair Display", serif; font-style: italic; }
.lb-date { font-family: "JetBrains Mono", monospace; font-size: 11px; color: rgba(255,255,255,0.7); }
.lb-download {
  background: #b08a4a;
  color: #fff;
  padding: 12px 22px;
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.06em;
  border-radius: 4px;
  transition: background .2s ease, transform .15s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.4);
}
.lb-download:hover { background: #fff; color: #b08a4a; transform: translateY(-1px); }

/* Upload Overlay */
.upload-overlay {
  position: fixed;
  inset: 0;
  background: rgba(14, 26, 43, 0.6);
  z-index: 250;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 48px 24px;
  overflow-y: auto;
  animation: lbFade .2s ease;
}
.upload-panel {
  background: #fff;
  width: 100%;
  max-width: 560px;
  padding: 28px 32px 24px;
  border-radius: 4px;
  box-shadow: 0 24px 60px rgba(0,0,0,0.25);
  display: flex;
  flex-direction: column;
  gap: 18px;
  font-family: "Inter", "Noto Sans TC", sans-serif;
}
.upload-panel header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  border-bottom: 1px solid #e3e7ee;
  padding-bottom: 14px;
}
.upload-panel header h3 {
  font-family: "Playfair Display", "Noto Serif TC", serif;
  font-size: 22px;
  font-weight: 500;
  color: #0e1a2b;
  letter-spacing: -0.005em;
}
.upload-close {
  background: none;
  border: none;
  font-size: 28px;
  cursor: pointer;
  color: #586478;
  line-height: 1;
}
.upload-name { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: #2a3a52; }
.upload-name input {
  border: 1px solid #e3e7ee;
  padding: 10px 12px;
  font-size: 14px;
  border-radius: 2px;
  font-family: inherit;
}
.upload-name input:focus { outline: none; border-color: #b08a4a; }

.upload-turnstile { min-height: 65px; display: flex; justify-content: center; align-items: center; }

.upload-drop {
  border: 2px dashed #e3e7ee;
  padding: 28px 20px;
  text-align: center;
  border-radius: 4px;
  color: #586478;
  font-size: 13px;
  background: #f9fafc;
}
.upload-drop p { margin: 4px 0; }
.upload-drop .upload-pick {
  display: inline-block;
  background: #0e1a2b;
  color: #fff;
  padding: 8px 18px;
  font-size: 13px;
  cursor: pointer;
  border-radius: 2px;
  margin: 8px 0;
}
.upload-drop .upload-pick input { display: none; }
.upload-drop .upload-hint { font-size: 11px; color: #9aa3b0; margin-top: 6px; }

.upload-list {
  list-style: none;
  padding: 0;
  margin: 0;
  max-height: 220px;
  overflow-y: auto;
  border: 1px solid #eef1f6;
  border-radius: 2px;
}
.upload-item {
  display: flex;
  justify-content: space-between;
  padding: 10px 14px;
  font-size: 13px;
  border-bottom: 1px solid #eef1f6;
}
.upload-item:last-child { border-bottom: none; }
.upload-item .upload-name-cell {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 60%;
  color: #2a3a52;
}
.upload-item .upload-status { color: #586478; font-family: "JetBrains Mono", monospace; font-size: 11px; }
.upload-done .upload-status { color: #2c7a3e; }
.upload-error .upload-status { color: #b03a2e; }

.upload-panel footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  padding-top: 8px;
  border-top: 1px solid #e3e7ee;
}
.upload-go {
  background: #b08a4a;
  color: #fff;
  border: none;
  padding: 11px 22px;
  font-size: 13px;
  letter-spacing: 0.06em;
  cursor: pointer;
  border-radius: 2px;
  transition: background .2s ease;
}
.upload-go:hover:not(:disabled) { background: #8b6a2f; }
.upload-go:disabled { opacity: 0.4; cursor: not-allowed; }
.upload-go.upload-done { background: #0e1a2b; }

@media (max-width: 640px) {
  .upload-panel { padding: 20px 18px; }
  .lb-stage { max-width: 100%; }
  .lb-nav { width: 44px; height: 44px; font-size: 24px; }
  .lightbox { padding: 16px; }
}

/* ── 引言 ──────────────────────────────── */
.acadB .pullB {
  max-width: 1100px;
  margin: 120px auto 0;
  padding: 80px 48px;
  text-align: center;
  border-top: 1px solid var(--B-line);
  border-bottom: 1px solid var(--B-line);
}
.acadB .pullB .gold-line {
  width: 48px;
  height: 1px;
  background: var(--B-accent);
  margin: 0 auto 24px;
}
.acadB .pullB blockquote {
  font-family: var(--B-serif);
  font-size: clamp(26px, 3vw, 40px);
  line-height: 1.4;
  font-weight: 500;
  font-style: italic;
  color: var(--B-ink);
  letter-spacing: -0.005em;
  margin-bottom: 24px;
}
.acadB .pullB .from {
  font-family: var(--B-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--B-accent);
  text-transform: uppercase;
}

/* ── 頁尾 — 純白底承載 Logo ──────────────────── */
.acadB .footB {
  background: var(--B-paper);
  border-top: 1px solid var(--B-line);
  margin-top: 96px;
  padding: 56px 48px 64px;
}
.acadB .footB-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: end;
}
.acadB .footB-logo {
  display: flex;
  align-items: center;
  gap: 20px;
}
.acadB .footB-logo img {
  height: 56px;
  width: auto;
  display: block;
}
.acadB .footB-logo .fb-badge {
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--B-line);
  padding-left: 20px;
  line-height: 1.3;
}
.acadB .footB-logo .fb-badge .a {
  font-family: var(--B-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--B-accent);
  text-transform: uppercase;
}
.acadB .footB-logo .fb-badge .b {
  font-family: var(--B-serif);
  font-size: 22px;
  font-weight: 500;
  color: var(--B-ink);
  letter-spacing: -0.005em;
  margin-top: 4px;
}
.acadB .footB-meta {
  text-align: right;
  font-size: 12px;
  color: var(--B-ink-3);
  display: flex;
  flex-direction: column;
  gap: 6px;
  letter-spacing: 0.04em;
}

/* ═══ 詳情頁 (overlay) ═══════════════════════ */
.acadB .det-overlay {
  position: fixed;
  inset: 0;
  background: var(--B-paper);
  z-index: 100;
  overflow-y: auto;
  animation: fadeInB .3s ease;
}
@keyframes fadeInB {
  from { opacity: 0; }
  to { opacity: 1; }
}

.acadB .detB-top {
  position: sticky;
  top: 0;
  background: var(--B-paper);
  border-bottom: 1px solid var(--B-line);
  z-index: 10;
  padding: 18px 48px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.acadB .detB-back {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--B-ink);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  border-bottom: 1px solid transparent;
}
.acadB .detB-back:hover { color: var(--B-accent); border-color: var(--B-accent); }
.acadB .detB-top img { height: 44px; }

.acadB .detB-hero {
  max-width: 1400px;
  margin: 0 auto;
  padding: 64px 48px 48px;
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 64px;
  align-items: end;
  border-bottom: 1px solid var(--B-line);
}
.acadB .detB-hero .crumbs {
  font-family: var(--B-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--B-accent-2);
  margin-bottom: 28px;
  text-transform: uppercase;
}
.acadB .detB-hero h1 {
  font-family: var(--B-serif);
  font-size: clamp(40px, 5.5vw, 72px);
  line-height: 1.06;
  font-weight: 500;
  letter-spacing: -0.015em;
  color: var(--B-ink);
  margin-bottom: 20px;
}
.acadB .detB-hero .sub {
  font-size: 15px;
  color: var(--B-ink-3);
  letter-spacing: 0.04em;
}
.acadB .detB-meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--B-line);
  border: 1px solid var(--B-line);
}
.acadB .detB-meta-cell {
  background: var(--B-paper);
  padding: 18px 20px;
}
.acadB .detB-meta-cell .lbl {
  font-family: var(--B-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--B-ink-3);
  margin-bottom: 6px;
  text-transform: uppercase;
}
.acadB .detB-meta-cell .val {
  font-family: var(--B-serif);
  font-size: 18px;
  font-weight: 500;
  color: var(--B-ink);
}

.acadB .detB-cover {
  max-width: 1400px;
  margin: 48px auto 0;
  padding: 0 48px;
  /* 沒有照片時用 placeholder（21:9 box）；有照片時讓圖片自己決定高度 */
}
.acadB .detB-cover:has(.ph) {
  aspect-ratio: 21 / 9;
}
.acadB .detB-cover .ph { border: 1px solid var(--B-line); }
.acadB .detB-cover img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 75vh;          /* 不超過 viewport 75%（避免太高把後面 Overview 推下去）*/
  object-fit: contain;        /* 完整顯示，不裁切 */
  background: var(--B-paper-2);
  border: 1px solid var(--B-line);
}

.acadB .detB-body {
  max-width: 1400px;
  margin: 0 auto;
  padding: 80px 48px 0;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 64px;
}
.acadB .detB-side .ix-mark {
  font-family: var(--B-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--B-accent);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--B-accent);
  margin-bottom: 16px;
  text-transform: uppercase;
}
.acadB .detB-side .tags { display: flex; flex-direction: column; gap: 6px; }
.acadB .detB-side .tags .tag {
  font-size: 12px;
  padding: 6px 12px;
  border: 1px solid var(--B-line);
  background: var(--B-paper-2);
  color: var(--B-ink-2);
  align-self: flex-start;
  letter-spacing: 0.04em;
}

.acadB .detB-main h3 {
  font-family: var(--B-serif);
  font-size: 28px;
  font-weight: 500;
  color: var(--B-ink);
  margin-bottom: 18px;
  letter-spacing: -0.005em;
}
.acadB .detB-main p.lede {
  font-size: 18px;
  line-height: 1.75;
  color: var(--B-ink-2);
  margin-bottom: 56px;
}
.acadB .detB-main .hl-list { border-top: 2px solid var(--B-ink); }
.acadB .detB-main .hl {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--B-line);
  align-items: baseline;
}
.acadB .detB-main .hl .num {
  font-family: var(--B-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--B-accent);
}
.acadB .detB-main .hl .text {
  font-size: 17px;
  color: var(--B-ink);
  line-height: 1.55;
}

.acadB .detB-gallery {
  max-width: 1400px;
  margin: 0 auto;
  padding: 96px 48px 0;
}
.acadB .detB-gallery-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--B-line);
  margin-bottom: 32px;
}
.acadB .detB-gallery-head h3 {
  font-family: var(--B-serif);
  font-size: 36px;
  font-weight: 500;
  letter-spacing: -0.005em;
  color: var(--B-ink);
}
.acadB .detB-gallery-head .meta {
  font-family: var(--B-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--B-ink-3);
  text-transform: uppercase;
}
.acadB .detB-gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.acadB .detB-gallery-grid .gitem {
  aspect-ratio: 4 / 3;
  border: 1px solid var(--B-line);
  position: relative;
  cursor: pointer;
  transition: border-color .2s ease;
}
.acadB .detB-gallery-grid .gitem:hover { border-color: var(--B-accent); }
.acadB .detB-gallery-grid .gitem .gnum {
  position: absolute;
  bottom: 8px;
  right: 10px;
  font-family: var(--B-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  color: var(--B-ink-2);
  background: rgba(255,255,255,0.92);
  padding: 2px 6px;
  z-index: 2;
}

.acadB .detB-nav {
  max-width: 1400px;
  margin: 80px auto 0;
  padding: 32px 48px;
  border-top: 1px solid var(--B-line);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.acadB .detB-nav button {
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.acadB .detB-nav button.right { text-align: right; align-items: flex-end; }
.acadB .detB-nav button .arrow {
  font-family: var(--B-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--B-ink-3);
  text-transform: uppercase;
}
.acadB .detB-nav button .name {
  font-family: var(--B-serif);
  font-size: 22px;
  font-weight: 500;
  color: var(--B-ink);
  letter-spacing: -0.005em;
}
.acadB .detB-nav button:hover .name { color: var(--B-accent); }
.acadB .detB-nav button:disabled { opacity: 0.3; cursor: not-allowed; }

@media (max-width: 1024px) {
  .acadB .heroB-bottom { grid-template-columns: 1fr; }
  .acadB .timeline { grid-template-columns: repeat(3, 1fr); gap: 16px; }
  .acadB .ix-row { grid-template-columns: 50px 1fr 32px; }
  .acadB .ix-date, .acadB .ix-loc, .acadB .ix-tags { display: none; }
  .acadB .featured-grid { grid-template-columns: 1fr; }
  .acadB .detB-hero { grid-template-columns: 1fr; gap: 32px; }
  .acadB .detB-body { grid-template-columns: 1fr; gap: 32px; }
  .acadB .detB-gallery-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ═══════════════════════════════════════════════
   Mobile (≤640px) — 手機體驗優化
═══════════════════════════════════════════════ */
@media (max-width: 640px) {
  /* ── Header / Nav ──────────────────── */
  .acadB .nav-inner {
    padding: 14px 18px;
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }
  .acadB .nav-logo { gap: 12px; }
  .acadB .nav-logo img { height: 38px; }
  .acadB .nav-logo .class-badge { padding-left: 12px; }
  .acadB .nav-logo .class-badge .cb-zh { font-size: 14px; }
  .acadB .nav-links {
    gap: 14px;
    font-size: 12px;
    flex-wrap: wrap;
    align-items: center;
  }
  .acadB .nav-links .nav-refresh {
    padding: 4px 10px;
    font-size: 11px;
  }

  /* ── Class banner ───────────────────── */
  .acadB .class-banner {
    padding: 10px 18px;
    font-size: 9px;
    letter-spacing: 0.18em;
  }
  .acadB .class-banner-inner {
    flex-direction: column;
    gap: 4px;
    align-items: flex-start;
  }

  /* ── Hero ───────────────────────────── */
  .acadB .heroB { padding: 48px 20px 40px; }
  .acadB .heroB-eyebrow { font-size: 10px; margin-bottom: 20px; gap: 10px; }
  .acadB .heroB h1 {
    font-size: 40px;
    line-height: 1.1;
    margin-bottom: 24px;
  }
  .acadB .heroB-bottom { gap: 28px; margin-top: 16px; }
  .acadB .heroB-deck { font-size: 15px; line-height: 1.65; }
  .acadB .heroB-stat { padding: 14px 16px; }
  .acadB .heroB-stat .num { font-size: 28px; }
  .acadB .heroB-stat .lbl { font-size: 9px; letter-spacing: 0.15em; }

  /* ── Timeline ───────────────────────── */
  .acadB .index-bar { padding: 36px 20px 0; }
  .acadB .index-bar-head h2 { font-size: 24px; }
  .acadB .index-bar-head .count { font-size: 10px; }
  .acadB .timeline {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 12px 0 32px;
  }
  .acadB .tl-tick {
    padding: 14px 0;
    border-bottom: 1px solid var(--B-line);
  }
  .acadB .tl-tick::before { display: none; }
  .acadB .tl-date { font-size: 16px; }

  /* ── Index of Visits ────────────────── */
  .acadB .indexlist { padding: 0 20px; }
  .acadB .indexlist-head h2 { font-size: 24px; }
  .acadB .indexlist-head .right { font-size: 9px; }
  .acadB .ix-row {
    padding: 16px 0;
    gap: 12px;
    grid-template-columns: 32px 1fr 24px;
  }
  .acadB .ix-num { font-size: 10px; }
  .acadB .ix-name { font-size: 17px; }
  .acadB .ix-arrow { font-size: 14px; }

  /* ── Featured ───────────────────────── */
  .acadB .featured { margin-top: 56px; padding: 0 20px; }
  .acadB .featured-head h2 { font-size: 22px; }
  .acadB .featured-head .gold-mark { font-size: 10px; }
  .acadB .feat-card.lead .feat-name { font-size: 22px; }
  .acadB .feat-card .feat-name { font-size: 18px; }

  /* ── Pull quote ─────────────────────── */
  .acadB .pullB {
    padding: 56px 20px;
    margin-top: 64px;
  }
  .acadB .pullB blockquote { font-size: 22px; }
  .acadB .pullB .from { font-size: 10px; }

  /* ── Footer ─────────────────────────── */
  .acadB .footB { padding: 40px 20px 48px; margin-top: 56px; }
  .acadB .footB-inner {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .acadB .footB-logo img { height: 44px; }
  .acadB .footB-logo .fb-badge .b { font-size: 18px; }
  .acadB .footB-meta {
    text-align: left;
    font-size: 11px;
  }

  /* ── Detail Top Bar ─────────────────── */
  .acadB .detB-top {
    padding: 12px 18px;
    flex-wrap: wrap;
    gap: 10px;
  }
  .acadB .detB-top img { height: 32px; }
  .acadB .detB-back { font-size: 12px; }
  .acadB .upload-trigger {
    padding: 7px 12px;
    font-size: 11px;
  }

  /* ── Detail Hero / Meta ─────────────── */
  .acadB .detB-hero {
    padding: 32px 20px 28px;
    gap: 20px;
  }
  .acadB .detB-hero .crumbs { font-size: 10px; margin-bottom: 18px; }
  .acadB .detB-hero h1 {
    font-size: 32px;
    line-height: 1.1;
    margin-bottom: 14px;
  }
  .acadB .detB-hero .sub { font-size: 13px; }
  .acadB .detB-meta-cell { padding: 12px 14px; }
  .acadB .detB-meta-cell .lbl { font-size: 9px; }
  .acadB .detB-meta-cell .val { font-size: 15px; }

  /* ── Detail Cover (handle vertical photos) ── */
  .acadB .detB-cover {
    padding: 0 20px;
    margin: 24px auto 0;
  }
  .acadB .detB-cover img { max-height: 60vh; }

  /* ── Detail Body / Highlights ───────── */
  .acadB .detB-body {
    padding: 48px 20px 0;
    gap: 24px;
  }
  .acadB .detB-side .ix-mark { font-size: 10px; }
  .acadB .detB-main h3 { font-size: 22px; }
  .acadB .detB-main p.lede {
    font-size: 16px;
    margin-bottom: 36px;
  }
  .acadB .detB-main .hl {
    grid-template-columns: 36px 1fr;
    gap: 12px;
    padding: 16px 0;
  }
  .acadB .detB-main .hl .text { font-size: 15px; line-height: 1.55; }

  /* ── Photo Gallery ──────────────────── */
  .acadB .detB-gallery { padding: 56px 20px 0; }
  .acadB .detB-gallery-head h3 { font-size: 22px; }
  .acadB .detB-gallery-head .meta { font-size: 9px; }
  .acadB .detB-gallery-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }
  /* mobile 縮圖封面標籤更小 */
  .acadB .detB-gallery-grid .gitem .gnum-cover {
    font-size: 8px;
    padding: 2px 6px;
    top: 6px;
    left: 6px;
  }
  /* mobile lightbox 動作按鈕全寬堆疊 */
  .lb-actions {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    width: 100%;
  }
  .lb-cover-btn {
    padding: 11px 16px;
    font-size: 13px;
    text-align: center;
  }

  /* ── Detail Nav (上一頁/下一頁) ────── */
  .acadB .detB-nav {
    padding: 24px 20px;
    gap: 16px;
  }
  .acadB .detB-nav button .arrow { font-size: 9px; }
  .acadB .detB-nav button .name { font-size: 15px; }

  /* ── Lightbox ──────────────────────── */
  .lightbox { padding: 12px; }
  .lb-close {
    top: 12px;
    right: 12px;
    font-size: 28px;
  }
  .lb-nav {
    width: 36px;
    height: 36px;
    font-size: 20px;
    flex-shrink: 0;
  }
  .lb-stage {
    max-width: calc(100% - 90px);
    gap: 10px;
  }
  .lb-meta {
    flex-direction: column;
    gap: 10px;
    align-items: stretch;
    font-size: 11px;
  }
  .lb-meta-left {
    flex-wrap: wrap;
    gap: 10px;
  }
  .lb-download {
    padding: 12px 18px;
    font-size: 14px;
    text-align: center;
    justify-content: center;
  }

  /* ── Upload Overlay (full-screen on mobile) ── */
  .upload-overlay {
    padding: 0;
    align-items: stretch;
  }
  .upload-panel {
    max-width: 100%;
    min-height: 100vh;
    padding: 20px 18px 24px;
    border-radius: 0;
    gap: 14px;
  }
  .upload-panel header h3 { font-size: 18px; }
  .upload-drop { padding: 22px 16px; }
}