/* ===========================================================================
   BIM_MCP 防迷路（Wayfinding）+ Drawer 樣式擴充
   日期：2026-05-18 / 版本：v1.1（加 scroll-snap + section-collapse + 週期表）
   不修改 styles.css 共用層 — 每頁可選擇載入此檔啟用
   =========================================================================== */

/* ===== Scroll Snap（每節一個視窗，像簡報滾動）===== */
html {
  scroll-snap-type: y proximity;
  scroll-padding-top: 120px;  /* 避免被 topnav + context bar 遮住 */
}
.bim-hero,
.bim-section {
  scroll-snap-align: start;
}
.bim-section.bim-anchor {
  min-height: calc(100vh - 130px);
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding-top: var(--gap-xl);
  padding-bottom: var(--gap-xl);
}
/* 不要對 .bim-section.no-snap 強制最小高度（給 frame / 索引這類短 section） */
.bim-section.bim-anchor.no-snap {
  min-height: 0;
  scroll-snap-align: none;
}
.bim-footer { scroll-snap-align: end; }

@media (max-width: 700px) {
  /* mobile: 不強制 snap，讓 thumb scroll 自然 */
  html { scroll-snap-type: none; }
  .bim-section.bim-anchor { min-height: 0; padding-top: var(--gap-lg); padding-bottom: var(--gap-lg); }
}

/* ===== Floating Progress Rail（右側細長 scroll 進度）===== */
.bim-progress {
  position: fixed;
  right: 0;
  top: 0;
  width: 3px;
  height: 100vh;
  background: rgba(255,255,255,0.04);
  z-index: 99;
  pointer-events: none;
}
.bim-progress-fill {
  width: 100%;
  height: 0;
  background: linear-gradient(180deg, var(--accent) 0%, rgba(96,165,250,0.4) 100%);
  transition: height 0.1s linear;
}

/* ===== Sticky Context Bar（topnav 下方，動態當前 section）===== */
.bim-context-bar {
  position: sticky;
  top: 51px; /* 緊貼 topnav 下方 */
  z-index: 90;
  background: rgba(0,0,0,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  padding: 9px 32px;
  font-family: var(--font-tech);
  font-size: 11px;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: opacity 0.3s, transform 0.3s;
}
.bim-context-bar.hidden { opacity: 0; transform: translateY(-100%); pointer-events: none; }
.bim-context-step {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-transform: uppercase;
  color: var(--text-secondary);
}
.bim-context-step .bim-context-num {
  background: var(--accent-bg);
  color: var(--accent);
  border: 1px solid var(--accent-border);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-weight: 700;
}
.bim-context-step .bim-context-name {
  color: var(--text-primary);
  font-weight: 600;
  letter-spacing: 0.5px;
}
.bim-context-back {
  color: var(--text-faint);
  border-bottom: none;
  padding: 2px 8px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 10px;
  transition: color 0.3s, border-color 0.3s;
}
.bim-context-back:hover { color: var(--accent); border-color: var(--accent-border); }

@media (max-width: 700px) {
  .bim-context-bar { padding: 8px 14px; font-size: 10px; letter-spacing: 1px; }
  .bim-context-back { display: none; }
}

/* ===== Section Marker（強化邊界 — 大型編號分隔）===== */
.bim-section-marker {
  text-align: center;
  padding: var(--gap-2xl) var(--gap-md) var(--gap-lg);
  border-top: 1px solid var(--border);
  position: relative;
  max-width: 1100px;
  margin: 0 auto;
}
.bim-section-marker::before {
  content: '';
  display: block;
  width: 40px;
  height: 1px;
  background: var(--accent);
  margin: 0 auto var(--gap-md) auto;
}
.bim-section-marker-num {
  font-family: var(--font-tech);
  font-size: 56px;
  font-weight: 800;
  color: var(--text-faint);
  letter-spacing: 4px;
  line-height: 1;
}
.bim-section-marker-label {
  font-family: var(--font-tech);
  font-size: 12px;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-top: 8px;
}

/* ===== Footer Preview Cards（next/prev with preview）===== */
.bim-footer-preview {
  max-width: 1100px;
  margin: var(--gap-xl) auto 0;
  padding: 0 32px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap-md);
}
.bim-footer-preview-card {
  display: block;
  padding: 22px 26px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  color: var(--text-primary);
  border-bottom: 1px solid var(--border);
  transition: border-color 0.3s, transform 0.3s, background 0.3s;
  text-decoration: none;
}
.bim-footer-preview-card:hover {
  border-color: var(--accent-border);
  background: var(--accent-bg);
  transform: translateY(-3px);
}
.bim-footer-preview-dir {
  font-family: var(--font-tech);
  font-size: 10px;
  letter-spacing: 3px;
  color: var(--text-faint);
  text-transform: uppercase;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.bim-footer-preview-card.next { text-align: right; }
.bim-footer-preview-card.next .bim-footer-preview-dir { justify-content: flex-end; }
.bim-footer-preview-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
  letter-spacing: 0;
}
.bim-footer-preview-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

@media (max-width: 700px) {
  .bim-footer-preview { grid-template-columns: 1fr; padding: 0 16px; }
  .bim-footer-preview-card.next { text-align: left; }
  .bim-footer-preview-card.next .bim-footer-preview-dir { justify-content: flex-start; }
}

/* ===== Enhanced TOC（section 編號 + 完成標記）===== */
.bim-toc .bim-toc-counter {
  font-family: var(--font-tech);
  font-size: 10px;
  color: var(--text-faint);
  margin-right: 8px;
  letter-spacing: 1px;
}
.bim-toc a {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 5px 0;
}
.bim-toc a.visited::before {
  content: '✓';
  color: var(--ok);
  font-size: 11px;
  margin-right: 4px;
}

/* ===== Drawer（右側滑出，借鏡 GENAI/web）===== */
.bim-drawer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(6px);
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}
.bim-drawer-overlay.open {
  opacity: 1;
  pointer-events: auto;
}
.bim-drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: min(75vw, 820px);
  height: 100vh;
  background: var(--bg);
  border-left: 1px solid var(--border-strong);
  box-shadow: -20px 0 60px rgba(0,0,0,0.6);
  z-index: 1001;
  transform: translateX(100%);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}
.bim-drawer.open { transform: translateX(0); }

.bim-drawer-head {
  position: sticky;
  top: 0;
  z-index: 2;
  background: rgba(0,0,0,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  padding: 18px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.bim-drawer-eyebrow {
  font-family: var(--font-tech);
  font-size: 10px;
  letter-spacing: 3px;
  color: var(--accent);
  text-transform: uppercase;
}
.bim-drawer-title {
  font-size: 22px;
  font-weight: 800;
  color: var(--text-primary);
  margin-top: 4px;
  letter-spacing: 0;
}
.bim-drawer-close {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.3s, color 0.3s, border-color 0.3s, transform 0.3s;
}
.bim-drawer-close:hover {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
  transform: rotate(90deg);
}
.bim-drawer-body {
  padding: 28px;
  flex: 1;
}
.bim-drawer-body h3 {
  font-size: 18px;
  margin: var(--gap-lg) 0 var(--gap-sm) 0;
  color: var(--text-primary);
}
.bim-drawer-body h3:first-child { margin-top: 0; }
.bim-drawer-body p {
  color: var(--text-secondary);
  margin-bottom: var(--gap-sm);
  line-height: 1.7;
}
.bim-drawer-body .user-quote {
  margin: var(--gap-md) 0;
}
.bim-drawer-body .how-tech,
.bim-drawer-body .empathy-quote,
.bim-drawer-body .further-reading,
.bim-drawer-body .pitfalls { margin: var(--gap-md) 0; }

.bim-drawer-foot {
  padding: 18px 28px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-faint);
}
.bim-drawer-foot a {
  font-family: var(--font-tech);
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--accent);
  border-bottom: 1px solid var(--accent-border);
  padding-bottom: 1px;
}

@media (max-width: 700px) {
  .bim-drawer { width: 100vw; border-left: none; }
  .bim-drawer-head { padding: 16px 18px; }
  .bim-drawer-body { padding: 20px 18px; }
  .bim-drawer-title { font-size: 18px; }
}

/* ===== Drawer Opener（限定 .bim-card / .domain-card / .prop-cell 樣式）===== */
.bim-card[data-drawer-open],
.domain-card[data-drawer-open] {
  cursor: pointer;
  position: relative;
  border-bottom: none;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-family: inherit;
  text-align: left;
  width: 100%;
  display: block;
  padding: 14px;
  border-radius: var(--radius-md);
  transition: border-color 0.3s, background 0.3s, transform 0.3s;
}
.bim-card[data-drawer-open]:hover,
.domain-card[data-drawer-open]:hover {
  border-color: var(--accent-border);
  background: var(--accent-bg);
  transform: translateY(-2px);
}
.bim-card[data-drawer-open]::after {
  content: '→';
  position: absolute;
  top: 50%;
  right: 16px;
  transform: translateY(-50%);
  color: var(--text-faint);
  font-size: 14px;
  transition: color 0.3s, transform 0.3s;
}
.bim-card[data-drawer-open]:hover::after {
  color: var(--accent);
  transform: translateY(-50%) translateX(4px);
}

/* ===== Section Drawer Bar（章節底部抽屜觸發列）===== */
.section-drawer-bar {
  display: flex;
  gap: 10px;
  margin-top: var(--gap-lg);
  padding-top: var(--gap-md);
  border-top: 1px dashed var(--border);
  flex-wrap: wrap;
  align-items: center;
}
.section-drawer-bar::before {
  content: '展開細節 →';
  font-family: var(--font-tech);
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--text-faint);
  text-transform: uppercase;
  margin-right: 8px;
}
.section-drawer-trigger {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  font-family: var(--font-tech);
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: border-color 0.3s, background 0.3s, color 0.3s, transform 0.3s;
}
.section-drawer-trigger::before {
  content: '⊕';
  font-size: 14px;
  color: var(--accent);
  transition: transform 0.3s;
}
.section-drawer-trigger:hover {
  border-color: var(--accent-border);
  background: var(--accent-bg);
  color: var(--text-primary);
  transform: translateY(-1px);
}
.section-drawer-trigger:hover::before {
  transform: rotate(90deg);
}
.section-drawer-trigger .count {
  background: rgba(255,255,255,0.06);
  padding: 1px 6px;
  border-radius: 8px;
  font-size: 10px;
  color: var(--text-faint);
  margin-left: 4px;
}

/* ===== 元素週期表（Option A · philosophy quick-index）===== */
.ptable {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: var(--gap-lg) 0;
}
.ptable-row {
  display: flex;
  gap: 6px;
  align-items: stretch;
}
.ptable-label {
  width: 180px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 10px 14px;
  border-right: 2px solid var(--border-strong);
}
.ptable-label .ptable-num {
  font-family: var(--font-tech);
  font-size: 26px;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
}
.ptable-label .ptable-group {
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 4px;
  letter-spacing: 0.5px;
}
.ptable-cell {
  flex: 1;
  min-width: 0;
  max-width: 280px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  text-align: left;
  font-family: inherit;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: background 0.3s, border-color 0.3s, transform 0.3s;
  position: relative;
}
.ptable-cell:hover {
  background: var(--accent-bg);
  border-color: var(--accent-border);
  transform: translateY(-2px);
}
.ptable-cell .ptable-p {
  font-family: var(--font-tech);
  font-size: 11px;
  letter-spacing: 1.5px;
  color: var(--accent);
  font-weight: 700;
}
.ptable-cell .ptable-name {
  font-size: 13px;
  color: var(--text-primary);
  line-height: 1.3;
}
.ptable-cell.star {
  background: var(--accent-bg);
  border-color: var(--accent);
}
.ptable-cell.star .ptable-p {
  color: var(--text-primary);
}
.ptable-cell.star .ptable-p::after {
  content: ' ★';
  color: var(--accent);
}
.ptable-cell.muted {
  opacity: 0.35;
  background: transparent;
  border-style: dashed;
}
.ptable-cell.muted:hover { transform: none; }

@media (max-width: 900px) {
  .ptable-row { flex-direction: column; gap: 4px; }
  .ptable-label { width: 100%; border-right: none; border-bottom: 1px solid var(--border-strong); padding: 8px 0; }
  .ptable-label .ptable-num { font-size: 18px; }
  .ptable-cell { max-width: none; }
}

/* ===== 五分類彩色 section eyebrow（給 domain-index 用）===== */
.bim-section[data-cat="compliance"] .bim-section-eyebrow { color: #ef4444; }
.bim-section[data-cat="workflow"] .bim-section-eyebrow { color: #60a5fa; }
.bim-section[data-cat="ops"] .bim-section-eyebrow { color: #fbbf24; }
.bim-section[data-cat="mep"] .bim-section-eyebrow { color: #4ade80; }
.bim-section[data-cat="frame"] .bim-section-eyebrow { color: #a78bfa; }

.bim-section[data-cat="compliance"] .bim-section-title::before,
.bim-section[data-cat="workflow"] .bim-section-title::before,
.bim-section[data-cat="ops"] .bim-section-title::before,
.bim-section[data-cat="mep"] .bim-section-title::before,
.bim-section[data-cat="frame"] .bim-section-title::before {
  content: '';
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  margin-right: 12px;
  transform: translateY(-3px);
}
.bim-section[data-cat="compliance"] .bim-section-title::before { background: #ef4444; }
.bim-section[data-cat="workflow"] .bim-section-title::before { background: #60a5fa; }
.bim-section[data-cat="ops"] .bim-section-title::before { background: #fbbf24; }
.bim-section[data-cat="mep"] .bim-section-title::before { background: #4ade80; }
.bim-section[data-cat="frame"] .bim-section-title::before { background: #a78bfa; }

/* Domain card 強化 — 加 trigger tag 顯示 */
.domain-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--border);
}
.domain-trigger {
  font-family: var(--font-tech);
  font-size: 10px;
  letter-spacing: 0.3px;
  color: var(--text-muted);
  background: rgba(255,255,255,0.04);
  padding: 1px 7px;
  border-radius: var(--radius-sm);
}
.domain-skill {
  font-family: var(--font-tech);
  font-size: 10px;
  color: var(--accent);
  background: var(--accent-bg);
  border: 1px solid var(--accent-border);
  padding: 1px 7px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  border-bottom: none;
}
.domain-skill:hover { background: var(--accent-bg-strong); }