*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #1565c0;
  --primary-light: #42a5f5;
  --accent: #ff9800;
  --success: #4caf50;
  --danger: #e74c3c;
  --info: #2196f3;
  --bg: #f5f5f5;
  --surface: #ffffff;
  --text: #212121;
  --text-sec: #757575;
  --border: #e0e0e0;
  --step-active: #1565c0;
  --step-done: #4caf50;
  --step-pending: #bdbdbd;
  --sidebar-w: 200px;
  --stats-w: 280px;
  --control-h: 140px;
  --header-h: 52px;
}

html, body { height: 100%; font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", sans-serif; background: var(--bg); color: var(--text); font-size: 14px; overflow: hidden; }

#app { display: grid; grid-template-rows: var(--header-h) 1fr var(--control-h); grid-template-columns: var(--sidebar-w) 1fr var(--stats-w); height: 100vh; }

/* Header */
#header { grid-column: 1 / -1; background: var(--primary); color: #fff; display: flex; align-items: center; padding: 0 20px; gap: 12px; }
#header h1 { font-size: 18px; font-weight: 600; }
#header .subtitle { font-size: 13px; opacity: 0.85; }
.header-home { display: flex; align-items: center; text-decoration: none; }
.header-logo { height: 34px; width: auto; max-width: 140px; object-fit: contain; }
.header-right { margin-left: auto; }
.header-back { color: rgba(255,255,255,0.85); text-decoration: none; font-size: 13px; padding: 4px 12px; border: 1px solid rgba(255,255,255,0.3); border-radius: 4px; transition: all 0.2s; }
.header-back:hover { background: rgba(255,255,255,0.15); color: #fff; }

/* Upload area */
.upload-area { border: 2px dashed var(--border); border-radius: 6px; padding: 8px 12px; text-align: center; cursor: pointer; transition: all 0.2s; background: #fafafa; display: flex; align-items: center; gap: 10px; }
.upload-area:hover, .upload-area.dragover { border-color: var(--primary); background: #e3f2fd; }
.upload-area .upload-icon { font-size: 20px; flex-shrink: 0; }
.upload-area .upload-text { font-size: 12px; color: var(--text-sec); white-space: nowrap; }
.upload-area .upload-hint { font-size: 11px; color: #999; text-align: left; line-height: 1.5; }
.upload-file-input { display: none; }
.upload-success { color: var(--success); font-size: 12px; margin-top: 6px; font-weight: 500; }
.template-link { font-size: 11px; color: var(--primary); cursor: pointer; text-decoration: underline; margin-top: 6px; display: inline-block; }
.template-link:hover { color: #0d47a1; }
.data-source-tabs { display: flex; gap: 0; flex-shrink: 0; }
.data-source-tab { padding: 6px 12px; text-align: center; font-size: 12px; cursor: pointer; border: 1px solid var(--border); background: #fafafa; color: var(--text-sec); transition: all 0.2s; white-space: nowrap; }
.data-source-tab:first-child { border-radius: 4px 0 0 4px; }
.data-source-tab:last-child { border-radius: 0 4px 4px 0; }
.data-source-tab.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* Step sidebar */
#step-sidebar { grid-row: 2; grid-column: 1; background: var(--surface); border-right: 1px solid var(--border); padding: 16px 0; overflow-y: auto; }

/* 3D canvas area */
#canvas-container { grid-row: 2; grid-column: 2; position: relative; overflow: hidden; background: var(--bg); }

/* Stats panel */
#stats-panel { grid-row: 2; grid-column: 3; background: var(--surface); border-left: 1px solid var(--border); padding: 16px; overflow-y: auto; }

/* Control bar */
#control-bar { grid-column: 1 / -1; grid-row: 3; background: var(--surface); border-top: 1px solid var(--border); padding: 10px 16px; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; overflow-y: auto; }

/* Step items */
.step-item { display: flex; align-items: center; gap: 10px; padding: 10px 16px; cursor: pointer; transition: background 0.2s; position: relative; }
.step-item:hover { background: #e3f2fd; }
.step-item.active { background: #e3f2fd; border-right: 3px solid var(--primary); }
.step-item.completed .step-num { background: var(--step-done); }
.step-num { width: 28px; height: 28px; border-radius: 50%; background: var(--step-pending); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 13px; font-weight: 600; flex-shrink: 0; }
.step-item.active .step-num { background: var(--step-active); }
.step-title { font-size: 13px; font-weight: 500; }
.step-desc { font-size: 11px; color: var(--text-sec); margin-top: 2px; }

/* Control elements */
.ctrl-group { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }
.ctrl-group label { font-size: 12px; color: var(--text-sec); white-space: nowrap; }
.ctrl-group input[type="range"] { width: 100px; min-width: 60px; }
.ctrl-group select { padding: 4px 8px; border: 1px solid var(--border); border-radius: 4px; font-size: 13px; max-width: 140px; }
.ctrl-value { font-size: 12px; min-width: 32px; text-align: center; color: var(--primary); font-weight: 600; }

.btn { padding: 6px 14px; border: none; border-radius: 4px; font-size: 13px; font-weight: 500; cursor: pointer; transition: all 0.2s; white-space: nowrap; flex-shrink: 0; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: #0d47a1; }
.btn-primary:disabled { background: var(--step-pending); cursor: not-allowed; }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: #e68a00; }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

/* Stats tables —— 三线表（Three-line table）风格 */
.stats-section { margin-bottom: 16px; }
.stats-section h3 { font-size: 13px; font-weight: 600; color: var(--primary); margin-bottom: 8px; padding-bottom: 4px; border-bottom: 2px solid var(--primary); }
.stats-table { width: 100%; border-collapse: collapse; font-size: 12px; border-top: 2px solid #333; border-bottom: 2px solid #333; margin: 4px 0 8px; }
.stats-table th, .stats-table td { padding: 5px 6px; text-align: right; border: none; background: transparent; }
.stats-table th { border-bottom: 1px solid #333; text-align: left; font-weight: 600; color: var(--text-sec); font-size: 11px; }
.stats-table td:first-child { text-align: left; font-weight: 500; }
.stats-table .sig { color: var(--danger); font-weight: 600; }

/* --- 辅助类（不再提供背景色，保留字体/颜色/色条等非填色装饰） --- */
.stats-table.zebra tbody tr:nth-child(even) td { background: transparent; } /* 兼容旧 class，但不再上色 */
.stats-table.num-tabular td, .stats-table.num-tabular th { font-variant-numeric: tabular-nums; }
.stats-table .overall-row td { border-top: 1px solid #333; font-weight: 600; }
.stats-table .group-bar { box-shadow: inset 3px 0 0 0 currentColor; }
/* 三线表纯黑：标题、数据、提示统一 #000（用于分组与虚拟变量编码、分组描述统计等严肃表格） */
.stats-table.mono,
.stats-table.mono th,
.stats-table.mono td,
.stats-table.mono .muted,
.stats-table.mono b { color: #000; }
.stats-badge-dummy { display: inline-block; min-width: 18px; padding: 0 2px; font-family: 'SF Mono', Menlo, Consolas, monospace; font-size: 12px; font-weight: 600; text-align: center; color: #000; }
.stats-badge-dummy.v1 { color: #000; font-weight: 700; }
.stats-badge-dummy.v0 { color: #000; font-weight: 400; }
.stats-callout { margin-top: 8px; padding: 6px 0 6px 10px; font-size: 12px; line-height: 1.6; border-left: 3px solid transparent; }
.stats-callout-reject { border-left-color: #e74c3c; color: #b71c1c; }
.stats-callout-accept { border-left-color: #4caf50; color: #1b5e20; }
.stats-group-label { display: inline-flex; align-items: center; gap: 6px; font-weight: 500; }
.stats-group-label .dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.stats-table .delta-pos { color: #2e7d32; }
.stats-table .delta-neg { color: #c62828; }
.stats-table .delta-zero { color: #999; }
.stats-table .muted { color: #999; }

/* Instruction box */
.instruction-box { background: #e3f2fd; border-radius: 6px; padding: 10px 14px; font-size: 12px; line-height: 1.6; color: #0d47a1; margin: 8px 16px; }

/* Step nav buttons */
.step-nav-btns { margin-left: auto; display: flex; gap: 8px; flex-shrink: 0; }

/* Checkbox as toggle */
.toggle-label { display: flex; align-items: center; gap: 6px; font-size: 12px; cursor: pointer; }
.toggle-label input { accent-color: var(--primary); }

/* Report overlay */
#report-overlay { display: none; position: fixed; inset: 0; z-index: 1000; background: rgba(0,0,0,0.5); align-items: center; justify-content: center; }
#report-overlay.visible { display: flex; }
#report-content { background: #fff; width: 800px; max-height: 90vh; overflow-y: auto; padding: 40px; border-radius: 8px; }

/* Responsive — Tablet */
@media (max-width: 1024px) {
  #app { grid-template-columns: 1fr; grid-template-rows: var(--header-h) auto 50vh auto var(--control-h); }
  #step-sidebar { grid-row: 2; grid-column: 1; display: flex; overflow-x: auto; border-right: none; border-bottom: 1px solid var(--border); padding: 8px; }
  #canvas-container { grid-row: 3; grid-column: 1; }
  #stats-panel { grid-row: 4; grid-column: 1; border-left: none; border-top: 1px solid var(--border); max-height: 200px; }
  #control-bar { grid-row: 5; grid-column: 1; }
  .step-item { flex-direction: column; text-align: center; min-width: 80px; padding: 6px 10px; }
  .step-item.active { border-right: none; border-bottom: 3px solid var(--primary); }
  .step-desc { display: none; }
  #report-content { width: 95%; padding: 24px; }
}

/* Responsive — Mobile */
@media (max-width: 600px) {
  :root {
    --header-h: auto;
    --control-h: auto;
  }

  /* Header: wrap to multi-line */
  #header {
    flex-wrap: wrap;
    padding: 8px 12px;
    gap: 6px;
    min-height: 44px;
  }
  #header h1 { font-size: 14px; }
  #header .subtitle { display: none; }
  .header-logo { height: 24px; width: auto; max-width: 100px; }
  .header-back { font-size: 11px; padding: 3px 8px; }

  /* App grid: stacked layout */
  #app {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto 45vh auto auto;
    height: auto;
    min-height: 100vh;
  }

  html, body { overflow: auto; }

  /* Step sidebar: wrap 模式——步骤横排 + 指引换行到下方 */
  #step-sidebar {
    display: flex;
    flex-wrap: wrap;
    -webkit-overflow-scrolling: touch;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: 4px 4px 0;
    gap: 0;
    white-space: nowrap;
  }
  .step-item {
    flex-direction: row;
    text-align: left;
    min-width: auto;
    padding: 4px 8px;
    flex-shrink: 0;
    gap: 4px;
  }
  .step-item.active { border-right: none; border-bottom: 2px solid var(--primary); }
  .step-num { width: 20px; height: 20px; font-size: 10px; }
  .step-title { font-size: 11px; }
  .step-desc { display: none; }
  /* 操作指引：占满一整行，放在步骤下方 */
  .instruction-box {
    flex-basis: 100%;
    margin: 4px 0;
    padding: 6px 10px;
    font-size: 11px;
    line-height: 1.5;
  }

  /* 3D Canvas */
  #canvas-container { min-height: 260px; }

  /* Stats panel: scrollable */
  #stats-panel {
    border-left: none;
    border-top: 1px solid var(--border);
    max-height: 180px;
    padding: 10px 12px;
  }
  .stats-section h3 { font-size: 12px; }
  .stats-table { font-size: 11px; }

  /* Control bar: 横向排列，下一步和操作按钮并排 */
  #control-bar {
    padding: 8px 12px;
    gap: 8px;
    flex-wrap: wrap;
    overflow-y: auto;
    max-height: none;
  }
  .ctrl-group label { font-size: 11px; }
  .ctrl-group input[type="range"] { width: 80px; }
  .btn { padding: 5px 12px; font-size: 12px; }
  .step-nav-btns { margin-left: auto; flex-shrink: 0; }
  .step-nav-btns .btn { padding: 5px 10px; font-size: 11px; }

  /* Upload area */
  .upload-area { padding: 6px 10px; }
  .upload-area .upload-icon { font-size: 18px; }
  .upload-area .upload-text { font-size: 11px; }
  .data-source-tabs { flex-shrink: 0; }
  .data-source-tab { font-size: 11px; padding: 5px 8px; }

  /* Report modal */
  #report-content { width: 100%; max-height: 85vh; padding: 16px; border-radius: 4px; }

  /* Instruction box */
  .instruction-box { font-size: 11px; padding: 8px 10px; margin: 6px 8px; }
}