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

  :root {
    --text:       #3B4839;
    --text-light: #647562;
    --text-muted: #93A292;
    --bg-body:    #EFECE5;
    --bg-page:    #F5F3EE;
    --bg-surface: #FBFAF7;
    --bg-warm:    #EDEAE2;
    --bg-alt:     #F0EEE8;
    --primary:    #7A9B7E;
    --primary-dk: #587A5C;
    --primary-bg: #F2F6F2;
    --teal:       #6B9B8A;
    --teal-bg:    #EEF5F2;
    --amber:      #B8953A;
    --amber-bg:   #FBF7ED;
    --rose:       #B85C5C;
    --rose-bg:    #FBF0F0;
    --divider:    #E2DFD7;
    --radius: 10px;
    --shadow-sm: 0 1px 3px rgba(60,70,55,0.04);
    --shadow:    0 3px 14px rgba(60,70,55,0.06);
  }

  html { font-size: 17px; scroll-behavior: smooth; }
  body {
    font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    color: var(--text);
    background: var(--bg-body);
    line-height: 1.9;
    -webkit-font-smoothing: antialiased;
  }

  @page { size: A4; margin: 0; }
  @media print {
    body { background: var(--bg-page); }
    .book { box-shadow: none; max-width: 100%; }
    .cover { page-break-after: always; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  }

  .book {
    max-width: 860px; margin: 0 auto;
    background: var(--bg-page);
    box-shadow: 0 8px 40px rgba(0,0,0,0.08);
  }

  /* ══════ COVER ══════ */
  .cover {
    min-height: 100vh;
    background: linear-gradient(160deg, #4F6E52 0%, #5F7E62 30%, #7A9B7E 55%, #5F7E62 100%);
    display: flex; flex-direction: column; justify-content: center; align-items: center;
    text-align: center; position: relative; overflow: hidden; padding: 60px 40px;
  }
  .cover-bg {
    position: absolute; inset: 0; pointer-events: none;
    background:
      radial-gradient(ellipse 65% 40% at 20% 70%, rgba(200,230,200,0.14) 0%, transparent 55%),
      radial-gradient(ellipse 50% 30% at 78% 22%, rgba(255,255,255,0.04) 0%, transparent 55%);
  }
  .cover-dots {
    position: absolute; inset: 0; pointer-events: none;
    background-image: radial-gradient(rgba(255,255,255,0.07) 1px, transparent 1px);
    background-size: 44px 44px;
    mask-image: radial-gradient(ellipse 65% 55% at 50% 50%, black 25%, transparent 70%);
  }
  .cover-top-bar {
    position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, transparent 0%, #B5CEB7 30%, #B5CEB7 70%, transparent 100%);
  }
  .cover-content { position: relative; z-index: 2; max-width: 680px; }
  .cover-brand { font-size: 22px; letter-spacing: 8px; color: #B5CEB7; margin-bottom: 52px; font-weight: 500; }
  .cover h1 { font-size: 62px; font-weight: 200; letter-spacing: 10px; color: #fff; margin-bottom: 18px; line-height: 1.2; }
  .cover h1 strong { font-weight: 700; letter-spacing: 7px; }
  .cover h2 { font-size: 26px; font-weight: 300; letter-spacing: 5px; color: rgba(255,255,255,0.52); margin-bottom: 56px; }
  .cover-rule { width: 48px; height: 1px; background: #B5CEB7; margin: 0 auto 56px; }
  .cover-footer { font-size: 12px; letter-spacing: 4px; color: rgba(255,255,255,0.30); font-weight: 300; }

  /* ══════ TOC ══════ */
  .toc { padding: 46px 56px; }
  .toc-list { list-style: none; margin-top: 18px; }
  .toc-list li {
    padding: 10px 0; border-bottom: 1px solid var(--divider);
    font-size: 15px; display: flex; align-items: baseline; gap: 12px;
  }
  .toc-list li:last-child { border-bottom: none; }
  .toc-num {
    color: var(--primary-dk); font-weight: 700; font-size: 14px;
    min-width: 60px; flex-shrink: 0;
  }
  .toc-list a {
    color: var(--text); text-decoration: none;
    transition: color 0.2s;
  }
  .toc-list a:hover { color: var(--primary-dk); }

  /* ══════ SECTION ══════ */
  .section { padding: 46px 56px; }
  .section-alt { background: var(--bg-alt); }

  .sec-title {
    font-size: 28px; font-weight: 700; color: var(--text);
    letter-spacing: 1px; margin-bottom: 4px; line-height: 1.3;
    page-break-after: avoid;
  }
  .sec-subtitle {
    font-size: 15px; color: var(--text-muted); font-weight: 400;
    margin-bottom: 12px; page-break-after: avoid;
  }
  .sec-divider {
    width: 34px; height: 3px; background: var(--primary);
    border-radius: 2px; margin-bottom: 28px;
  }

  /* ══════ CONTENT CARD ══════ */
  .content-card {
    background: var(--bg-surface); border: 1px solid var(--divider);
    border-radius: var(--radius); padding: 24px 28px; margin-bottom: 16px;
    box-shadow: var(--shadow-sm); font-size: 15px; color: var(--text); line-height: 2.1;
    page-break-inside: avoid;
  }

  /* ══════ INSIGHT BOX ══════ */
  .insight-box {
    border-radius: var(--radius); padding: 20px 24px; margin: 18px 0;
    font-size: 15px; line-height: 1.9; page-break-inside: avoid;
  }
  .insight-box.grn  { background: var(--primary-bg); border-left: 4px solid var(--primary); }
  .insight-box.teal { background: var(--teal-bg);   border-left: 4px solid var(--teal); }
  .insight-box.amber{ background: var(--amber-bg);  border-left: 4px solid var(--amber); }
  .insight-box.rose { background: var(--rose-bg);   border-left: 4px solid var(--rose); }
  .insight-label { font-size: 12px; font-weight: 700; letter-spacing: 3px; text-transform: uppercase; margin-bottom: 6px; }
  .insight-box.grn  .insight-label { color: var(--primary-dk); }
  .insight-box.teal .insight-label { color: var(--teal); }
  .insight-box.amber .insight-label{ color: var(--amber); }
  .insight-box.rose .insight-label { color: var(--rose); }

  /* ══════ SUMMARY CARDS ══════ */
  .summary-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin: 18px 0; }
  .summary-card {
    background: var(--bg-surface); border: 1px solid var(--divider);
    border-radius: var(--radius); padding: 20px 22px;
    box-shadow: var(--shadow-sm); page-break-inside: avoid;
  }
  .summary-card h4 { font-size: 15px; font-weight: 700; color: var(--primary-dk); margin-bottom: 10px; display: flex; align-items: center; gap: 8px; }
  .summary-card .item { margin-bottom: 8px; }
  .summary-card .item:last-child { margin-bottom: 0; }
  .summary-card .item-label { font-size: 12px; font-weight: 700; color: var(--text-muted); letter-spacing: 1px; display: block; margin-bottom: 2px; }
  .summary-card .item-text { font-size: 14px; color: var(--text); line-height: 1.7; }

  /* ══════ ADVANTAGE BADGE ROW ══════ */
  .adv-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 16px 0; }
  .adv-badge {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    padding: 8px 18px; border-radius: 22px; font-size: 14px; font-weight: 600;
    background: var(--primary-bg); color: var(--primary-dk);
    border: 1px solid rgba(122,155,126,0.22);
  }
  .adv-badge .adv-icon { font-size: 16px; }

  /* ══════ FLOW ══════ */
  .flow-row {
    display: flex; align-items: stretch; gap: 0;
    margin: 26px 0; border-radius: var(--radius); overflow: hidden;
    box-shadow: var(--shadow-sm); border: 1px solid var(--divider);
    page-break-inside: avoid;
  }
  .flow-item {
    flex: 1; text-align: center; padding: 18px 8px; position: relative; background: var(--bg-surface);
  }
  .flow-item::after {
    content: '›'; position: absolute; right: -4px; top: 50%;
    transform: translateY(-50%); font-size: 22px; color: var(--text-muted); font-weight: 300; z-index: 2;
  }
  .flow-item:last-child::after { content: none; }
  .flow-num {
    width: 32px; height: 32px; border-radius: 50%; background: var(--primary);
    color: #fff; display: inline-flex; align-items: center; justify-content: center;
    font-size: 13px; font-weight: 700; margin-bottom: 8px;
  }
  .flow-name { font-size: 14px; font-weight: 600; color: var(--text); margin-bottom: 2px; }
  .flow-desc { font-size: 11px; color: var(--text-muted); }

  /* ══════ GUARANTEE CARDS ══════ */
  .guarantee-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 20px 0; }
  .guarantee-card {
    text-align: center; padding: 24px 14px;
    border-radius: var(--radius); border: 1px solid var(--divider);
    background: var(--bg-surface); transition: transform 0.15s, box-shadow 0.15s;
    page-break-inside: avoid;
  }
  .guarantee-card:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
  .guarantee-icon { font-size: 28px; margin-bottom: 10px; }
  .guarantee-card h4 { font-size: 15px; font-weight: 700; color: var(--primary-dk); margin-bottom: 6px; }
  .guarantee-card p { font-size: 13px; color: var(--text-light); line-height: 1.7; }

  /* ══════ STRENGTH GRID ══════ */
  .strength-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin: 18px 0; }
  .strength-card {
    padding: 20px 18px; border-radius: var(--radius);
    border: 1px solid var(--divider); background: var(--bg-surface);
    text-align: center; page-break-inside: avoid;
  }
  .strength-card .str-num { font-size: 32px; font-weight: 900; color: var(--primary); line-height: 1.2; }
  .strength-card .str-unit { font-size: 14px; color: var(--primary-dk); font-weight: 600; }
  .strength-card .str-label { font-size: 14px; color: var(--text-muted); margin-top: 4px; }
  .strength-card .str-sub { font-size: 12px; color: var(--text-light); margin-top: 2px; }

  /* ══════ RESOURCE CARDS ══════ */
  .resource-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin: 18px 0; }
  .resource-card {
    padding: 18px 18px; border-radius: var(--radius);
    border: 1px solid var(--divider); background: var(--bg-surface);
    display: flex; gap: 14px; align-items: flex-start;
    page-break-inside: avoid;
  }
  .resource-icon {
    width: 42px; height: 42px; border-radius: 10px;
    background: var(--primary-bg); color: var(--primary-dk);
    display: flex; align-items: center; justify-content: center;
    font-size: 19px; flex-shrink: 0;
  }
  .resource-body h4 { font-size: 15px; font-weight: 700; color: var(--primary-dk); margin-bottom: 4px; }
  .resource-body p { font-size: 13px; color: var(--text-light); line-height: 1.7; }

  /* ══════ EXAMPLE BOX ══════ */
  .example-box {
    background: linear-gradient(135deg, #EEF5F2 0%, #E6F1ED 100%);
    border: 1px solid rgba(107,155,138,0.18); border-radius: var(--radius);
    padding: 18px 22px; margin: 18px 0; font-size: 14px; line-height: 1.9;
    page-break-inside: avoid;
  }
  .example-tag {
    display: inline-block; background: var(--teal); color: #fff;
    font-size: 11px; padding: 3px 14px; border-radius: 14px;
    font-weight: 600; letter-spacing: 1px; margin-bottom: 8px;
  }

  /* ══════ TIMELINE ══════ */
  .timeline { margin: 22px 0; position: relative; padding-left: 22px; }
  .timeline::before { content: ''; position: absolute; left: 8px; top: 0; bottom: 0; width: 2px; background: var(--divider); }
  .timeline-item { position: relative; padding: 0 0 20px 30px; }
  .timeline-item:last-child { padding-bottom: 0; }
  .timeline-item::before {
    content: ''; position: absolute; left: -18px; top: 5px;
    width: 10px; height: 10px; border-radius: 50%;
    background: var(--primary); border: 2px solid var(--bg-page);
    box-shadow: 0 0 0 2px var(--primary);
  }
  .timeline-label { font-size: 12px; color: var(--primary-dk); font-weight: 600; letter-spacing: 1px; margin-bottom: 2px; }
  .timeline-title { font-size: 15px; font-weight: 600; color: var(--text); }
  .timeline-desc { font-size: 12px; color: var(--text-muted); }

  /* ══════ SOFTWARE TABLE ══════ */
  .soft-table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 14px; page-break-inside: avoid; }
  .soft-table thead th {
    background: #5C7A5F; color: #fff; padding: 11px 18px;
    font-weight: 500; font-size: 13px; letter-spacing: 1px; text-align: left;
  }
  .soft-table thead th:first-child { border-radius: var(--radius) 0 0 0; }
  .soft-table thead th:last-child { border-radius: 0 var(--radius) 0 0; }
  .soft-table tbody td { padding: 13px 18px; border-bottom: 1px solid var(--divider); line-height: 1.8; }
  .soft-table tbody tr:nth-child(even) td { background: var(--bg-alt); }
  .soft-table tbody tr:last-child td:first-child { border-radius: 0 0 0 var(--radius); }
  .soft-table tbody tr:last-child td:last-child { border-radius: 0 0 var(--radius) 0; }

  /* ══════ MODE CARDS ══════ */
  .mode-card {
    background: var(--bg-surface); border: 1px solid var(--divider);
    border-radius: var(--radius); padding: 20px 24px; margin-bottom: 10px;
    box-shadow: var(--shadow-sm); display: flex; gap: 18px; align-items: flex-start;
    page-break-inside: avoid;
  }
  .mode-icon {
    width: 46px; height: 46px; border-radius: 13px;
    display: flex; align-items: center; justify-content: center; font-size: 22px; flex-shrink: 0;
    background: var(--primary-bg); color: var(--primary-dk);
  }
  .mode-body h4 { font-size: 16px; font-weight: 700; color: var(--text); margin-bottom: 4px; }
  .mode-body p { font-size: 14px; color: var(--text-light); line-height: 1.8; }

  /* ══════ DIRECTION TAGS ══════ */
  .tag-cloud { display: grid; grid-template-columns: repeat(4, 1fr); gap: 9px; margin: 14px 0; }
  .dir-tag {
    padding: 8px 20px; border-radius: 22px; font-size: 14px; font-weight: 500; text-align: center;
    background: var(--primary-bg); color: var(--primary-dk);
    border: 1px solid rgba(122,155,126,0.18);
  }

  /* ══════ TIP ══════ */
  .tip {
    display: flex; align-items: flex-start; gap: 10px;
    padding: 13px 18px; border-radius: 6px;
    background: var(--primary-bg); font-size: 13px; color: #4A5E3E;
    margin: 10px 0; line-height: 1.7; page-break-inside: avoid;
  }
  .tip-icon { flex-shrink: 0; font-size: 16px; margin-top: 1px; }

  /* ══════ SYSTEM MANUAL BOX ══════ */
  .manual-box {
    background: linear-gradient(135deg, #F2F6F2 0%, #E8F0E9 100%);
    border: 2px solid var(--primary);
    border-radius: var(--radius); padding: 22px 26px; margin: 18px 0;
    page-break-inside: avoid;
  }
  .manual-box h4 { font-size: 16px; color: var(--primary-dk); margin-bottom: 10px; }
  .manual-link {
    display: inline-block; padding: 10px 24px;
    background: var(--primary); color: #fff; text-decoration: none;
    border-radius: 22px; font-size: 14px; font-weight: 600;
    letter-spacing: 1px; transition: all 0.3s;
  }
  .manual-link:hover { background: var(--primary-dk); }

  /* ══════ CTA ══════ */
  .cta {
    background: linear-gradient(160deg, #4F6E52 0%, #5F7E62 100%);
    text-align: center; padding: 52px 44px; color: #fff; position: relative; overflow: hidden;
  }
  .cta::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
    background: linear-gradient(90deg, transparent 0%, var(--primary) 50%, transparent 100%);
  }
  .cta h3 { font-size: 26px; font-weight: 700; letter-spacing: 3px; margin-bottom: 10px; position: relative; }
  .cta p { font-size: 14px; color: rgba(255,255,255,0.52); font-weight: 300; line-height: 1.8; margin-bottom: 28px; position: relative; }

  /* ══════ FOOTER ══════ */
  .footer {
    text-align: center; padding: 22px 40px; font-size: 11px;
    color: var(--text-muted); letter-spacing: 1px; line-height: 1.8;
    background: var(--bg-page);
  }

  /* ══════ RESPONSIVE ══════ */
  @media (max-width: 680px) {
    .section, .toc { padding: 34px 22px; }
    .cover h1 { font-size: 38px; letter-spacing: 5px; }
    .cover h1 strong { letter-spacing: 4px; }
    .cover-brand { font-size: 16px; letter-spacing: 5px; }
    .cover h2 { font-size: 17px; letter-spacing: 3px; }
    .sec-title { font-size: 23px; }
    .guarantee-grid, .resource-grid, .strength-grid, .summary-grid { grid-template-columns: 1fr; }
    .tag-cloud { grid-template-columns: repeat(2, 1fr); }
    .adv-row { grid-template-columns: repeat(2, 1fr); }
    .flow-row { flex-direction: column; }
    .flow-item::after { content: '∨'; right: 50%; top: auto; bottom: -6px; transform: translateX(50%); }
    .flow-item:last-child::after { content: none; }
    .mode-card { flex-direction: column; }
    .content-card { padding: 20px 18px; }
  }