:root {
    --bg: #f6f7fb;
    --panel: #ffffff;
    --line: #dde2ec;
    --text: #1f2937;
    --muted: #667085;
    --accent: #1d4ed8;
    --accent-soft: #dbeafe;
    --event: #eff6ff;
    --trajectory: #f5f3ff;
    --filler: #f8fafc;
    --danger-soft: #fee2e2;
    --success-soft: #dcfce7;
    --shadow: 0 8px 24px rgba(16, 24, 40, 0.08);
  }
  
  * { box-sizing: border-box; }
  html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text); font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
  body { min-height: 100vh; }
  
  .topbar {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 16px;
    padding: 20px 24px 16px;
    border-bottom: 1px solid var(--line);
    background: rgba(255,255,255,0.9);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
  }
  
  .topbar h1 { margin: 0 0 4px; font-size: 24px; }
  .sub { margin: 0; color: var(--muted); }
  .topbar-controls { display: flex; gap: 12px; flex-wrap: wrap; }
  .topbar-controls label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--muted); }
  select, input[type="search"], textarea {
    border: 1px solid var(--line);
    background: #fff;
    color: var(--text);
    border-radius: 10px;
    padding: 10px 12px;
    font: inherit;
  }
  
  .layout {
    display: grid;
    grid-template-columns: 320px 1fr 360px;
    gap: 16px;
    padding: 16px;
    align-items: start;
  }
  
  .panel {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
    overflow: visible;
    min-height: calc(100vh - 120px);
  }
  
  .panel-header {
    padding: 14px 16px;
    border-bottom: 1px solid var(--line);
    background: rgba(255,255,255,0.92);
    padding: 14px 16px 10px;
  }
  .panel-header h2 { margin: 0; font-size: 16px; }
  .sticky {
    position: sticky;
    top: 73px;
    z-index: 20;
    padding-bottom: 8px;   /* 여유 공간 확보 */
  }
  .panel-body { padding: 16px; }
  .stack { display: flex; flex-direction: column; gap: 12px; }
  .card {
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 14px;
    padding: 14px;
  }
  .card.compact { padding: 12px; }
  .card h3, .card h4 { margin: 0 0 10px; }
  .muted { color: var(--muted); }
  .small { font-size: 12px; }
  .badges { display: flex; flex-wrap: wrap; gap: 8px; }
  .badge {
    display: inline-flex; align-items: center; gap: 6px;
    font-size: 12px; padding: 4px 8px; border-radius: 999px;
    background: #f3f4f6; border: 1px solid var(--line);
  }
  .badge.event { background: var(--event); }
  .badge.trajectory { background: var(--trajectory); }
  .badge.filler { background: var(--filler); }
  .badge.mismatch { background: var(--danger-soft); }
  .badge.match { background: var(--success-soft); }
  
  .filler-summary {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
  }
  
  .expand-btn,
  .collapse-btn {
    font-size: 12px;
    padding: 4px 8px;
    border-radius: 6px;
    border: 1px solid var(--line);
    background: #fff;
    cursor: pointer;
  }
  
  .expand-btn:hover,
  .collapse-btn:hover {
    border-color: var(--accent);
  }

  .query-text {
    font-size: 17px;
    line-height: 1.55;
    padding: 14px;
    border-radius: 14px;
    background: #f8fafc;
    border: 1px solid var(--line);
  }

  .query-meta {
    margin-top: 10px;
    padding: 10px;
    border-radius: 10px;
    background: #f8fafc;
    border: 1px solid var(--line);
    font-size: 13px;
    line-height: 1.4;
  }
  
  .query-meta div {
    margin-bottom: 4px;
  }
  
  .meta-block {
    margin: 4px 0 8px;
    padding: 8px;
    border-radius: 8px;
    background: #f1f5f9;
    font-size: 13px;
    line-height: 1.4;
  }
  
  .meta-block div {
    margin-bottom: 2px;
  }

  .list-item {
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 10px 12px;
    background: #fff;
  }
  .list-item.selected { border-color: var(--accent); background: var(--accent-soft); }
  .list-item .title { font-weight: 600; margin-bottom: 4px; }
  
  .evidence-header {
    display: flex;
    flex-direction: column;   /* 🔥 핵심: 세로 분리 */
    align-items: stretch;
    gap: 10px;
  }
  .evidence-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 12px;
    align-items: center;
  }
  .evidence-body {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 16px;
    margin-top: 6px;   /* 🔥 header랑 분리 */
  }
  .sessions-side { padding-top: 8px;}
  .session-card { margin-top: 6px; margin-bottom: 14px; }
  
  .session-card {
    border: 1px solid var(--line);
    border-radius: 16px;
    overflow: hidden;
    background: #fff;
  }
  .session-card[data-kind="event"] .session-meta { background: var(--event); }
  .session-card[data-kind="trajectory"] .session-meta { background: var(--trajectory); }
  .session-card[data-kind="filler"] .session-meta { background: var(--filler); }
  .session-meta {
    display: flex; justify-content: space-between; align-items: flex-start; gap: 10px;
    padding: 12px 14px; border-bottom: 1px solid var(--line);
  }
  .session-title { font-weight: 700; }
  .session-subtitle { color: var(--muted); font-size: 13px; margin-top: 4px; }
  .session-body { padding: 12px 14px; }
  .turns { display: flex; flex-direction: column; gap: 10px; }
  .turn {
    display: grid;
    grid-template-columns: 82px 1fr;
    gap: 10px;
    align-items: start;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: #fff;
  }
  .turn-role {
    font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .04em;
    color: var(--muted);
  }
  .turn-content { white-space: pre-wrap; line-height: 1.5; }
  .summary-only { color: var(--muted); }
  .session-actions {
    display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px;
  }
  .list-item.clickable {
    cursor: pointer;
  }
  
  .list-item.clickable:hover {
    background: var(--accent-soft);
  }
  
  .highlight {
    outline: 2px solid var(--accent);
    transition: all 0.3s ease;
  }
  .scroll-top-btn {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: none;
    background: var(--accent);
    color: white;
    font-size: 20px;
    cursor: pointer;
    box-shadow: var(--shadow);
    
    opacity: 0;
    pointer-events: none;
    transform: translateY(10px);
    transition: all 0.25s ease;
  }
  
  .scroll-top-btn.show {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }
  
  .scroll-top-btn:hover {
    background: #1e40af;
  }
  button {
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 10px;
    padding: 8px 10px;
    font: inherit;
    cursor: pointer;
  }
  button:hover { border-color: var(--accent); }
  button.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
  
  .annot-group { margin-bottom: 18px; }
  .annot-group h3 { margin: 0 0 10px; font-size: 15px; }
  .check-grid { display: grid; gap: 8px; }
  .check-grid label, .selection-grid label { display: flex; gap: 10px; align-items: flex-start; }
  .selection-grid { display: grid; gap: 6px; max-height: 220px; overflow: auto; border: 1px solid var(--line); border-radius: 12px; padding: 10px; }
  textarea { width: 100%; min-height: 110px; resize: vertical; }
  .range-wrap { display: grid; gap: 6px; }
  .range-labels { display: flex; justify-content: space-between; font-size: 12px; color: var(--muted); }
  .footer-actions { display: flex; gap: 8px; flex-wrap: wrap; }
  .annotation-status { padding: 10px 12px; border-radius: 12px; background: #f8fafc; border: 1px solid var(--line); }
  
  pre.codeish {
    margin: 0;
    white-space: pre-wrap;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 12px;
    background: #f8fafc;
    padding: 12px;
    border-radius: 12px;
    border: 1px solid var(--line);
  }

  mark {
    display: inline;
    line-height: inherit;
    background: #fde68a;
    padding: 0 2px;
    border-radius: 3px;
  }
  
  @media (max-width: 1280px) {
    .layout { grid-template-columns: 1fr; }
    .panel { min-height: auto; }
    .sticky { position: static; }
  }