:root {
    --bg: #fafaf9; --card: #fff; --text: #1c1c1e;
    --text2: #636366; --text3: #8e8e93;
    --border: #e5e5ea; --border2: #f0f0f2;
    --accent: #2563eb; --accent2: #eff6ff; --accent3: #dbeafe;
    --amber: #d97706; --amber2: #fffbeb;
    --green: #059669; --green2: #ecfdf5;
    --red: #dc2626; --red2: #fef2f2;
    --purple: #7c3aed; --purple2: #f5f3ff;
    --rds: 8px; --rds2: 12px;
    --shadow: 0 1px 3px rgba(0,0,0,.04);
  }
  *{margin:0;padding:0;box-sizing:border-box}
  html{overflow-y:scroll;overflow-x:hidden;background:#fafaf9}
  body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);line-height:1.7;-webkit-font-smoothing:antialiased;display:flex;flex-direction:column;min-height:100vh}

  .navbar{background:#1e293b;color:#fff;position:sticky;top:0;z-index:200}
  .navbar-inner{max-width:1200px;margin:0 auto;padding:0 24px;display:flex;align-items:center;gap:24px;height:52px}
  .navbar-brand{display:flex;align-items:baseline;gap:8px;flex-shrink:0}
  .navbar-title{font-size:16px;font-weight:700;white-space:nowrap}
  .navbar-version{font-size:11px;font-weight:400;color:#94a3b8}
  .navbar-tabs{display:flex;align-items:center;gap:4px;flex-shrink:0}
  .nav-tab{padding:6px 16px;border:none;background:none;color:#94a3b8;cursor:pointer;font-family:inherit;font-size:13px;font-weight:500;border-radius:6px;transition:all .15s;white-space:nowrap}
  .nav-tab:hover{background:rgba(255,255,255,.08);color:#e2e8f0}
  .nav-tab.active{background:rgba(255,255,255,.15);color:#fff}
  .navbar-sub{font-size:12px;color:#64748b;margin-left:auto;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

  .toolbar{position:sticky;top:52px;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
  .toolbar-inner{max-width:1200px;margin:0 auto;padding:12px 24px}
  .tb-row{display:flex;align-items:center;gap:10px;margin-bottom:8px;font-size:12px;line-height:1.8}
  .tb-row:last-child{margin-bottom:0}
  .tb-label{font-weight:600;color:var(--text2);min-width:36px;flex-shrink:0;padding-top:2px}
  .tb-options{display:flex;gap:16px;flex-wrap:wrap;align-items:center}
  .count{font-size:13px;font-weight:600;color:var(--accent);background:var(--accent2);padding:4px 10px;border-radius:6px;white-space:nowrap}
  .fbtn{font-size:13px;padding:6px 14px;border-radius:6px;border:1px solid var(--border);background:#fff;color:var(--text2);cursor:pointer;font-family:inherit;white-space:nowrap;transition:all .12s}
  .fbtn:hover{border-color:var(--accent);color:var(--accent)}
  .fbtn.active{background:var(--accent);color:#fff;border-color:var(--accent)}
  .flbl{font-size:11px;cursor:pointer;white-space:nowrap;display:inline-flex;align-items:center;gap:3px;color:var(--text2)}
  .flbl input[type=radio],.flbl input[type=checkbox]{accent-color:var(--accent);width:13px;height:13px;margin:0;cursor:pointer}


  .container{max-width:1200px;margin:0 auto;padding:24px 24px 80px}

  /* ====== TOC SIDEBAR ====== */
  .bank-layout{display:flex;gap:24px;align-items:flex-start}
  .toc-sidebar{width:190px;flex-shrink:0;position:sticky;top:100px;max-height:calc(100vh - 140px);overflow-y:auto;background:var(--card);border:1px solid var(--border2);border-radius:var(--rds2);padding:12px 0;box-shadow:var(--shadow);scrollbar-width:thin;scrollbar-color:var(--border) transparent}
  .toc-sidebar::-webkit-scrollbar{width:4px}
  .toc-sidebar::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}
  .toc-title{display:flex;align-items:center;justify-content:space-between;font-size:12px;font-weight:700;color:var(--text2);padding:0 14px 8px;border-bottom:1px solid var(--border2);margin-bottom:4px}
  .toc-toggle{width:20px;height:20px;border:none;background:none;cursor:pointer;font-size:10px;color:var(--text3);display:flex;align-items:center;justify-content:center;border-radius:4px;transition:all .15s;padding:0;line-height:1}
  .toc-toggle:hover{background:var(--border2);color:var(--text)}
  .toc-expand-all{border:none;background:none;cursor:pointer;font-size:11px;color:var(--text3);padding:2px 6px;border-radius:4px;font-family:inherit;transition:all .12s;white-space:nowrap}
  .toc-expand-all:hover{color:var(--accent);background:var(--accent2)}
  .toc-sidebar.collapsed{width:36px;padding:12px 8px}
  .toc-sidebar.collapsed .toc-title{border-bottom:none;padding:0;justify-content:center;margin-bottom:0}
  .toc-sidebar.collapsed .toc-title span{display:none}
  .toc-sidebar.collapsed .toc-toggle{transform:rotate(180deg)}
  .toc-sidebar.collapsed .toc-tree,.toc-sidebar.collapsed .toc-expand-all{display:none}
  .toc-tree{font-size:12px;line-height:1.6}
  .toc-chapter{margin-bottom:1px}
  .toc-chapter-header{display:flex;align-items:center;gap:3px;padding:5px 14px;cursor:pointer;color:var(--text);font-weight:600;transition:background .1s;font-size:12px}
  .toc-chapter-header:hover{background:var(--accent2)}
  .toc-chapter-header .toc-arrow{width:12px;height:12px;display:inline-flex;align-items:center;justify-content:center;transition:transform .2s;font-size:9px;color:var(--text3);flex-shrink:0}
  .toc-chapter.collapsed .toc-arrow{transform:rotate(-90deg)}
  .toc-chapter.collapsed .toc-sections{display:none}
  .toc-sections{padding-left:0}
  .toc-section{display:block;padding:3px 14px 3px 26px;cursor:pointer;color:var(--text2);transition:all .1s;border-left:2px solid transparent;text-decoration:none;font-size:11px}
  .toc-section:hover{color:var(--text);background:var(--accent2)}
  .toc-section.active{color:var(--accent);border-left-color:var(--accent);background:var(--accent3);font-weight:600}
  .bank-main{flex:1;min-width:0}
  .intro{background:var(--card);border-radius:var(--rds2);padding:24px;margin-bottom:24px;box-shadow:var(--shadow);border:1px solid var(--border2);font-size:14px;color:var(--text2);line-height:1.8}
  .intro b{color:var(--text)}
  .hl{color:var(--amber);font-weight:600}

  .section{margin-bottom:28px}
  .section-header{display:flex;align-items:center;gap:10px;margin-bottom:14px;padding-bottom:8px;border-bottom:1px solid var(--border);cursor:pointer;user-select:none}
  .section-header:hover{opacity:.7}
  .section-num{width:26px;height:26px;border-radius:6px;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;flex-shrink:0}
  .section-title{font-size:18px;font-weight:700;flex:1;display:flex;align-items:center;gap:8px}
  .section-count{font-size:12px;font-weight:400;color:var(--text3)}
  .section-toggle{width:24px;height:24px;border-radius:6px;background:#f1f5f9;display:flex;align-items:center;justify-content:center;transition:background .2s;flex-shrink:0}
  .section-toggle svg{width:13px;height:13px;color:#64748b;transition:transform .25s}
  .section.collapsed .section-body{display:none}
  .section.collapsed .section-toggle{background:var(--accent2)}
  .section.collapsed .section-toggle svg{transform:rotate(-90deg)}
  .section.hidden{display:none}

  .subsection{background:var(--card);border-radius:var(--rds2);padding:16px 20px;margin-bottom:10px;box-shadow:var(--shadow);border:1px solid var(--border2)}
  .subsection.hidden{display:none}
  .subsection h3{font-size:15px;font-weight:600;margin-bottom:2px;display:flex;align-items:center;gap:8px}
  .sec-cb{width:15px;height:15px;border-radius:3px;border:2px solid #d1d5db;flex-shrink:0;cursor:pointer;background:#fff;display:inline-block}
  .sec-cb.sc-all{background:var(--accent);border-color:var(--accent)}
  .sec-cb.sc-all::after{content:'';display:block;width:5px;height:9px;border:solid #fff;border-width:0 2px 2px 0;transform:rotate(45deg);margin:1px 0 0 4px}
  .sec-cb.sc-part{background:var(--accent);border-color:var(--accent)}
  .sec-cb.sc-part::after{content:'';display:block;width:7px;height:0;border:solid #fff;border-width:0;border-top:2px solid #fff;margin:5px 0 0 2px}
  .phase-tag{font-size:10px;padding:2px 6px;border-radius:3px;font-weight:500;margin-left:6px;vertical-align:middle}
  .phase-review{background:#fef3c7;color:#92400e}
  .phase-test{background:#dbeafe;color:#1e40af}
  .phase-both{background:#ede9fe;color:#5b21b6}

  .item{display:flex;align-items:center;gap:8px;padding:8px 0;border-bottom:1px solid var(--border2);font-size:13px;line-height:1.6}
  .item:last-child{border-bottom:none}
  .item.selected{}
  .item.hidden{display:none}
  .item .cb{width:16px;height:16px;border-radius:4px;border:2px solid #d1d5db;flex-shrink:0;margin-top:2px;cursor:pointer;background:#fff;position:relative}
  .item .cb.checked{background:var(--accent);border-color:var(--accent)}
  .item .cb.checked::after{content:'';position:absolute;left:3px;top:0;width:5px;height:9px;border:solid #fff;border-width:0 2px 2px 0;transform:rotate(45deg);pointer-events:none}
  .item:hover .cb{border-color:var(--accent)}
  .item-label{flex:1}
  .item-label b{color:var(--text)}
  .item-meta{display:flex;gap:4px;align-items:center;flex-shrink:0;flex-wrap:wrap}
  .tag{display:inline-block;font-size:10px;padding:1px 6px;border-radius:3px;font-weight:500;white-space:nowrap}
  .tag-b{background:var(--accent3);color:#1d4ed8}
  .tag-c{background:#fce7f3;color:#be185d}
  .tag-star{background:var(--red2);color:var(--red)}
.tag-builtin{background:#fef3c7;color:#92400e;font-weight:600}
  .tag-p1{background:#fef3c7;color:#92400e}
  .tag-p2{background:#fee2e2;color:#991b1b}
  .tag-p3{background:#dbeafe;color:#1e40af}
  .tag-p4{background:var(--purple2);color:var(--purple)}
  .tag-p5{background:#f3f4f6;color:#374151}
  .tag-p6{background:var(--green2);color:var(--green)}
  .tag-p7{background:#ccfbf1;color:#0f766e}

  .himi-icon{position:relative;font-size:16px;line-height:1;color:var(--amber);cursor:help}
  .himi-icon .himi-tip{display:none;position:absolute;left:24px;top:-4px;width:260px;padding:8px 12px;background:#fff;color:var(--text);font-size:12px;line-height:1.6;border-radius:8px;box-shadow:0 4px 16px rgba(0,0,0,.15);z-index:300;white-space:normal;font-weight:400}
  .himi-icon:hover .himi-tip{display:block}
  .himi-note{font-size:12px;color:#92400e;line-height:1.6;margin-top:8px;padding:12px 14px;background:var(--amber2);border-radius:8px;border-top:3px solid var(--amber);display:none;width:100%}
  .item.selected .himi-note{display:block}
  .item.selected{flex-wrap:wrap}
  .himi-note .himi-label{display:block;font-weight:700;color:#b45309;margin-bottom:3px;font-size:12px}

  .highlight{background:var(--amber2);border-left:3px solid var(--amber);padding:10px 14px;border-radius:0 8px 8px 0;font-size:12px;color:#92400e;margin-bottom:8px;line-height:1.6}
  .footer{text-align:center;padding:20px 32px;color:var(--text3);font-size:13px;border-top:1px solid var(--border);background:var(--bg)}

  /* Principle legend */
  .legend{display:flex;gap:8px;flex-wrap:wrap;font-size:11px;color:var(--text3)}
  .legend span{padding:2px 8px;border-radius:10px}
  .p1{background:#fef3c7;color:#92400e}
  .p2{background:#fee2e2;color:#991b1b}
  .p3{background:#dbeafe;color:#1e40af}
  .p4{background:var(--purple2);color:var(--purple)}
  .p5{background:#f3f4f6;color:#374151}
  .p6{background:var(--green2);color:var(--green)}
  .p7{background:#ccfbf1;color:#0f766e}

  @media print{
    .toolbar,.tab-nav{display:none}
    .header{background:#1e293b!important;-webkit-print-color-adjust:exact}
    body{background:#fff}
    .section-body{display:block!important}
    .section-toggle{display:none}
    .subsection{box-shadow:none;break-inside:avoid}
  }


/* Segment control for view switch */
.segctrl{display:inline-flex;background:#f1f5f9;border-radius:8px;padding:2px}
.segctrl button{padding:5px 14px;border:none;background:none;font-size:12px;font-weight:500;color:var(--text2);cursor:pointer;font-family:inherit;border-radius:6px;transition:all .15s}
.segctrl button:hover{color:var(--text)}
.segctrl button.active{background:#fff;color:var(--accent);box-shadow:0 1px 3px rgba(0,0,0,.1)}
  .tab-panel{flex:1}
  .tab-panel.hidden{display:none}

  /* ====== PLAN LIST ====== */
  .plan-card{background:var(--card);border-radius:var(--rds2);padding:16px 20px;margin-bottom:12px;box-shadow:var(--shadow);border:1px solid var(--border2);cursor:pointer;transition:all .12s}
  .plan-card:hover{border-color:var(--accent)}
  .plan-card h3{font-size:16px;font-weight:600;margin-bottom:4px}
  .plan-card .plan-meta{font-size:12px;color:var(--text3);display:flex;gap:16px;flex-wrap:wrap}
  .plan-card .plan-actions{margin-top:8px;display:flex;gap:8px}
  .plan-actions .fbtn{}

  /* ====== PLAN EXECUTION ====== */
  .walk-item{display:flex;align-items:flex-start;gap:10px;padding:12px 14px;border-bottom:1px solid var(--border2);font-size:13px;line-height:1.6}
  .walk-item:last-child{border-bottom:none}
  .walk-item .walk-num{width:24px;height:24px;border-radius:12px;background:#f1f5f9;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:600;color:var(--text3);flex-shrink:0}
  .walk-item .walk-text{flex:1;min-width:0}
  .walk-item .walk-status{display:flex;gap:8px;flex-shrink:0}
  .walk-status label{font-size:11px;cursor:pointer;padding:3px 8px;border-radius:4px;border:1px solid var(--border);white-space:nowrap;display:inline-flex;align-items:center;gap:3px}
  .walk-status label:hover{border-color:var(--accent)}
  .walk-status input[type=radio]{accent-color:var(--accent);width:12px;height:12px;margin:0;cursor:pointer}
  .walk-status label.has-pass{background:#ecfdf5;border-color:#059669;color:#059669}
  .walk-status label.has-issue{background:#fef2f2;border-color:#dc2626;color:#dc2626}
  .walk-status label.has-na{background:#f8fafc;border-color:#94a3b8;color:#64748b}
  .walk-progress{display:flex;gap:16px;font-size:13px;color:var(--text2);margin-bottom:16px;flex-wrap:wrap}
  .walk-progress span{font-weight:600}

  /* ====== PLAN QUESTION SELECTOR ====== */
  .pq-item{display:flex;align-items:center;gap:8px;padding:6px 8px;border-bottom:1px solid var(--border2);font-size:12px;cursor:pointer}
  .pq-item:hover{background:var(--accent2)}
  .pq-item .pq-cb{width:14px;height:14px;border-radius:3px;border:2px solid #d1d5db;flex-shrink:0;cursor:pointer;background:#fff}
  .pq-item .pq-cb.checked{background:var(--accent);border-color:var(--accent)}
  .pq-item .pq-cb.checked::after{content:'';position:absolute;left:2px;top:-1px;width:4px;height:7px;border:solid #fff;border-width:0 1.5px 1.5px 0;transform:rotate(45deg)}

  .walk-sticky{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);padding:16px 0 12px;margin:-24px -999px 24px;padding-left:999px;padding-right:999px;border-bottom:1px solid var(--border)}

  .hidden{display:none !important}

  /* ====== MODAL ====== */
  .modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.4);z-index:500;display:flex;align-items:center;justify-content:center}
  .modal-box{background:#fff;border-radius:12px;padding:24px;width:90%;max-width:680px;max-height:85vh;overflow-y:auto;box-shadow:0 8px 32px rgba(0,0,0,.2)}
  .modal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}
  .modal-header h3{font-size:18px;font-weight:700;margin:0}
  .modal-close{border:none;background:none;font-size:24px;color:var(--text3);cursor:pointer;padding:0;line-height:1}
  .modal-close:hover{color:var(--text)}

  /* ====== WALKTHROUGH NOTE ====== */
  .walk-note{width:100%;margin-top:6px;padding:6px 8px;border:1px solid var(--border);border-radius:4px;font-size:12px;font-family:inherit;resize:vertical;min-height:28px}
  .walk-note:focus{border-color:var(--accent);outline:none}