/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #0a0c10;
  --surface:   #111419;
  --surface2:  #181c23;
  --border:    #252a34;
  --border2:   #2e3440;
  --text:      #e8eaf0;
  --muted:     #6b7280;
  --accent:    #f0c040;
  --accent2:   #e8854a;

  --op-root:         #6366f1;
  --op-select_table: #06b6d4;
  --op-select_row:   #10b981;
  --op-select_col:   #3b82f6;
  --op-count:        #f59e0b;
  --op-sort:         #ec4899;
  --op-filter:       #8b5cf6;
  --op-write:        #ef4444;

  --radius: 8px;
  --font-display: 'Syne', sans-serif;
  --font-mono: 'DM Mono', monospace;

  /* Tree layout */
  --node-w: 200px;
  --node-h: 42px;
  --node-gap-x: 60px;   /* horizontal gap between levels */
  --node-gap-y: 20px;   /* vertical gap between siblings */
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  min-height: 100vh;
}

/* ===== HERO ===== */
.hero {
  padding: 80px 40px 60px;
  text-align: center;
  position: relative;
  border-bottom: 1px solid var(--border);
  background: radial-gradient(ellipse at 50% 0%, rgba(240,192,64,0.07) 0%, transparent 70%);
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(0deg,   transparent, transparent 39px, rgba(255,255,255,0.018) 39px, rgba(255,255,255,0.018) 40px),
    repeating-linear-gradient(90deg,  transparent, transparent 39px, rgba(255,255,255,0.018) 39px, rgba(255,255,255,0.018) 40px);
  pointer-events: none;
}
.hero-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid rgba(240,192,64,0.4);
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 24px;
}
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(52px, 8vw, 96px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #f0c040 0%, #e8854a 50%, #f0c040 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.8;
  margin-bottom: 40px;
}
.toc {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}
.toc a {
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--border2);
  padding: 6px 16px;
  border-radius: 4px;
  transition: all 0.2s;
}
.toc a:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(240, 192, 64, 0.06);
}
.toc a.active {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(240, 192, 64, 0.06);
}

/* ===== FILE PATH PANEL ===== */
.filepath-panel {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 20px 32px;
}
.filepath-inner { max-width: 1400px; margin: 0 auto; }
.filepath-title {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 14px;
}
.filepath-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin-bottom: 14px;
}
.filepath-row {
  display: flex;
  align-items: center;
  gap: 8px;
}
.filepath-row label {
  font-size: 11px;
  color: var(--muted);
  width: 76px;
  text-align: right;
  flex-shrink: 0;
}
.filepath-row input {
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--surface2);
  border: 1px solid var(--border2);
  color: var(--accent);
  padding: 5px 10px;
  border-radius: 4px;
  width: 260px;
  outline: none;
  transition: border-color 0.2s;
}
.filepath-row input:focus { border-color: var(--accent); }
.load-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  background: var(--accent);
  color: #0a0c10;
  border: none;
  padding: 8px 24px;
  border-radius: 5px;
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 0.04em;
}
.load-btn:hover { background: #f8d060; transform: translateY(-1px); }
.load-status {
  margin-top: 10px;
  font-size: 12px;
  min-height: 18px;
}
.load-status.ok  { color: #4ade80; }
.load-status.err { color: #f87171; }

/* ===== MAIN ===== */
main { max-width: 1400px; margin: 0 auto; padding: 0 32px 80px; }

/* ===== SECTIONS ===== */
.section { padding: 64px 0 0; }
.section-header { display: flex; align-items: flex-start; gap: 20px; margin-bottom: 32px; }
.section-num {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent);
  background: rgba(240,192,64,0.08);
  border: 1px solid rgba(240,192,64,0.2);
  padding: 4px 10px;
  border-radius: 4px;
  white-space: nowrap;
  margin-top: 4px;
}
.section-title {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}
.section-desc { font-size: 12px; color: var(--muted); margin-top: 4px; }

/* ===== CONFIG ===== */
.config-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 10px;
}
.config-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: border-color 0.2s;
}
.config-item:hover { border-color: var(--border2); }
.config-key { font-size: 11px; color: var(--muted); letter-spacing: 0.04em; }
.config-value { font-size: 13px; color: var(--accent); font-weight: 500; word-break: break-all; }

/* ===== TABS ===== */
.tab-nav { display: flex; gap: 2px; border-bottom: 1px solid var(--border); }
.tab-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 10px 20px;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: -1px;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); background: rgba(240,192,64,0.04); }

/* ===== TABLE ===== */
.table-container {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 var(--radius) var(--radius);
  background: var(--surface);
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 12px;
}
.data-table th {
  background: var(--surface2);
  color: var(--accent);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 10px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.data-table td {
  padding: 9px 16px;
  color: var(--text);
  border-bottom: 1px solid rgba(37,42,52,0.6);
  white-space: nowrap;
  font-size: 12px;
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover { background: rgba(240,192,64,0.03); }
.data-table td.num { color: var(--accent2); text-align: right; }
.data-table td.player-winner { color: #4ade80; }
.data-table td.player-loser  { color: #f87171; }

/* ===== TREE CONTROLS ===== */
.tree-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}
.filter-label { font-size: 11px; color: var(--muted); letter-spacing: 0.05em; text-transform: uppercase; white-space: nowrap; }
.filter-chips { display: flex; gap: 6px; flex-wrap: wrap; }
.chip {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 12px;
  border-radius: 20px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.18s;
  opacity: 0.45;
  color: #fff;
}
.chip.active { opacity: 1; }
.chip:hover  { opacity: 0.85; }

/* ===== TREE CANVAS ===== */
.tree-scroll { overflow-x: auto; overflow-y: visible; margin-bottom: 0; }
.tree-canvas {
  position: relative;
  /* width & height set by JS */
}
#treeSvg {
  position: absolute;
  top: 0; left: 0;
  pointer-events: none;
  overflow: visible;
}
#treeNodes { position: absolute; top: 0; left: 0; }

/* ===== TREE NODE ===== */
.t-node {
  position: absolute;
  width: var(--node-w);
  height: var(--node-h);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: #fff;
  cursor: pointer;
  transition: filter 0.18s, transform 0.18s, opacity 0.2s;
  user-select: none;
  text-align: center;
  padding: 0 10px;
  line-height: 1.3;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.t-node:hover {
  filter: brightness(1.2);
  transform: translateY(-2px);
  z-index: 10;
}
.t-node.selected {
  outline: 2px solid #fff;
  outline-offset: 2px;
  z-index: 20;
}
.t-node.dimmed { opacity: 0.1; pointer-events: none; }

/* ===== DETAIL PANEL ===== */
.detail-panel {
  margin-top: 24px;
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: var(--radius);
  overflow: hidden;
  display: none;
}
.detail-panel.visible { display: block; animation: fadeIn 0.25s ease; }
.detail-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  background: var(--surface2);
  border-bottom: 1px solid var(--border);
}
.detail-op-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 12px;
  color: #fff;
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.detail-title {
  flex: 1;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}
.detail-close {
  background: none;
  border: 1px solid var(--border2);
  color: var(--muted);
  border-radius: 4px;
  width: 28px; height: 28px;
  cursor: pointer;
  font-size: 13px;
  transition: all 0.15s;
}
.detail-close:hover { color: var(--text); border-color: var(--muted); }

.detail-body {
  padding: 20px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 900px) { .detail-body { grid-template-columns: 1fr; } }

.detail-block {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px 16px;
}
.detail-block.full-width { grid-column: 1 / -1; }
.detail-block-label {
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}
.detail-block-content {
  font-size: 12px;
  color: var(--text);
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
}
.detail-block-content .pill {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 11px;
  margin: 2px 3px 2px 0;
  color: #fff;
}
.detail-block-content code {
  font-family: var(--font-mono);
  font-size: 11px;
  background: rgba(255,255,255,0.07);
  padding: 1px 5px;
  border-radius: 3px;
}
.detail-table-wrap { overflow-x: auto; max-height: 200px; overflow-y: auto; margin-top: 4px; }
.detail-table {
  border-collapse: collapse;
  font-size: 11px;
  font-family: var(--font-mono);
  width: 100%;
}
.detail-table th {
  background: rgba(255,255,255,0.05);
  color: var(--accent);
  padding: 5px 10px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  font-size: 10px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.detail-table td {
  padding: 4px 10px;
  border-bottom: 1px solid rgba(37,42,52,0.5);
  color: var(--text);
  white-space: nowrap;
}

/* ===== COMPARISON ===== */
.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 800px) { .compare-grid { grid-template-columns: 1fr; } }
.compare-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.compare-label {
  padding: 12px 20px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--border);
  font-family: var(--font-display);
}
.compare-label.reference { background: rgba(99,102,241,0.08); color: #a5b4fc; border-bottom-color: rgba(99,102,241,0.2); }
.compare-label.generated { background: rgba(240,192,64,0.06); color: var(--accent); border-bottom-color: rgba(240,192,64,0.2); }
.source-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 3px;
  background: rgba(255,255,255,0.06);
  color: var(--muted);
  font-weight: 400;
}
.compare-body {
  padding: 24px;
  font-size: 13px;
  line-height: 1.85;
  color: var(--text);
}
.compare-body p { margin-bottom: 14px; }
.compare-body p:last-child { margin-bottom: 0; }
/* matching highlight */
.match-hl {
  background: rgba(74, 222, 128, 0.18);
  color: #86efac;
  border-radius: 2px;
  padding: 0 1px;
}

/* ===== FOOTER ===== */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 32px;
  text-align: center;
  font-size: 11px;
  color: var(--muted);
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--muted); }

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.section { animation: fadeIn 0.4s ease both; }

/* 修改部分 */
.tab-btn {
  /* ... 原有樣式 ... */
  border-bottom: 2px solid transparent;
  opacity: 0.6;
}

.tab-btn.active {
  opacity: 1;
  color: var(--accent);
  border-bottom: 2px solid var(--accent);
  background: rgba(240, 192, 64, 0.1);
  font-weight: 700;
}

.table-container {
  transition: all 0.3s ease;
  min-height: 200px;
}

/* 確保高亮綠色清晰 */
.match-hl {
  background: rgba(74, 222, 128, 0.25);
  color: #4ade80;
  padding: 0 2px;
  border-radius: 2px;
}

/* 彈窗遮罩背景 (Modal Overlay) */
.detail-panel {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.9); /* 初始縮小，做彈出動畫 */
  width: 90%;
  max-width: 800px;
  max-height: 85vh;
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: 16px;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.8), 0 0 0 100vw rgba(0, 0, 0, 0.6); /* 遮罩效果 */
  z-index: 2000;
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1); /* 彈性動畫 */
  overflow: hidden;
}

/* 顯示狀態 */
.detail-panel.visible {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, -50%) scale(1);
}

/* 彈窗頭部固定 */
.detail-header {
  padding: 16px 24px;
  background: var(--surface2);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

/* 內容區滾動 */
.detail-body {
  padding: 24px;
  overflow-y: auto;
  flex-grow: 1;
  background: var(--bg); /* 內容區深色背景 */
}

/* 滾動條美化 (針對 Webkit) */
.detail-body::-webkit-scrollbar { width: 6px; }
.detail-body::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 10px; }

/* Modal Overlay - 確保覆蓋全網頁 */
.modal-overlay {
  position: fixed;
  /* 固定定位，不隨捲軸移動 */
  top: 0;
  left: 0;
  width: 100vw;
  /* 使用視窗寬度 */
  height: 100vh;
  /* 使用視窗高度 */
  background: rgba(0, 0, 0, 0.8);
  /* 深色半透明背景 */
  backdrop-filter: blur(6px);
  /* 背景模糊，增加層次感 */
  display: flex;
  align-items: center;
  justify-content: center;

  /* 重要：設定極高的 z-index 確保在最上層 */
  z-index: 9999;

  /* 預設隱藏 */
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 顯示時的狀態 */
.modal-overlay.visible {
  opacity: 1;
  visibility: visible;
}

/* Modal Container 內部視窗樣式優化 */
.modal-container {
  width: 90%;
  max-width: 1000px;
  /* 稍微加大，讓表格更寬敞 */
  max-height: 85vh;
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: 16px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  transform: scale(0.95);
  /* 出現時帶有縮放動畫 */
  transition: transform 0.3s ease;
  overflow: hidden;
  /* 防止內容溢出邊角 */
}

.modal-overlay.visible .modal-container {
  transform: scale(1);
}

/* 禁止背後網頁捲動 (搭配 JS) */
body.modal-open {
  overflow: hidden;
}