:root{
    --primary:#D84315;
    --primary-dark:#BF360C;
    --secondary:#FF7043;
    --bg-light:#FFF3E0;
    --border-light:#FFCCBC;
    --success:#10b981;
    --danger:#ef4444;
  }
  *{box-sizing:border-box;}
  body{font-family:'Inter',Arial,sans-serif;margin:0;color:#222;background:#fbfbfd;line-height:1.6;}
  hr{border:none;border-top:1px solid #e9ecef;margin:2.5rem 0;}

  header{text-align:center;background:linear-gradient(135deg,var(--primary) 0%,var(--secondary) 100%);color:#fff;padding:2.75rem 1.25rem 2.25rem;}
  header h1{margin:0 0 .6rem;font-size:2.1rem;}
  header .intro{max-width:760px;margin:0 auto;color:rgba(255,255,255,.95);line-height:1.7;font-size:1.05rem;}
  header .byline{margin-top:.8rem;color:rgba(255,255,255,.75);font-size:.85rem;}

  main{max-width:1180px;margin:0 auto;padding:0 1.25rem 2.5rem;}
  .section-title{color:var(--primary);font-size:1.55rem;margin:0 0 1.1rem;text-align:center;position:relative;padding-bottom:.6rem;}
  .section-title::after{content:'';position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:70px;height:3px;background:var(--secondary);border-radius:2px;}

  .key-facts{background:#fff;border:1.5px solid var(--border-light);border-radius:14px;padding:1.3rem 1.6rem;margin:1.6rem 0;box-shadow:0 2px 8px rgba(0,0,0,.05);}
  .key-facts h3{margin:0 0 .8rem;font-size:1.02rem;color:var(--primary);}
  .key-facts ul{margin:0;padding-left:1.2rem;}
  .key-facts li{margin-bottom:.45rem;font-size:.93rem;color:#333;}
  .toc{background:#f8f9fa;border-radius:12px;padding:1.1rem 1.35rem;margin:1.6rem 0;}
  .toc strong{display:block;margin-bottom:.55rem;color:var(--primary);}
  .toc ul{margin:0;padding-left:1.2rem;columns:2;}
  .toc li{margin-bottom:.35rem;font-size:.9rem;}
  .toc a{color:var(--secondary);text-decoration:none;}
  .toc a:hover{text-decoration:underline;}

  .quick-answer{background:var(--bg-light);border:1px solid var(--border-light);border-left:5px solid var(--primary);border-radius:10px;padding:1.15rem 1.45rem;margin:1.3rem 0 2rem;font-size:.98rem;color:var(--primary-dark);line-height:1.75;}
  .alert-box{background:#fff3cd;border:1px solid #ffc107;border-left:4px solid #ffc107;border-radius:8px;padding:1.05rem 1.3rem;margin-bottom:1.6rem;}
  .alert-box strong{display:block;margin-bottom:.5rem;color:#856404;}
  .alert-box p{margin:.3rem 0;color:#856404;font-size:.9rem;}

  /* ===== Tool UI ===== */
  .kao-toolbar{background:#fff;border:1px solid #e9ecef;border-radius:16px;box-shadow:0 3px 12px rgba(0,0,0,.07);padding:1.3rem;margin-bottom:1.5rem;}
  .kao-search-row{display:flex;gap:.7rem;margin-bottom:1rem;flex-wrap:wrap;}
  .kao-search-input{flex:1;min-width:200px;padding:.75rem 1rem;border:1.5px solid #e0e0e0;border-radius:12px;font-size:.95rem;outline:none;transition:border-color .2s;}
  .kao-search-input:focus{border-color:var(--primary);}
  .surprise-btn{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;border:none;border-radius:12px;padding:.75rem 1.3rem;font-weight:700;font-size:.9rem;cursor:pointer;white-space:nowrap;transition:all .2s;}
  .surprise-btn:hover{transform:translateY(-2px);box-shadow:0 8px 18px rgba(216,67,21,.3);}

  .category-pills{display:flex;flex-wrap:wrap;gap:.5rem;}
  .category-pill{background:#f8f9fa;border:1.5px solid #e9ecef;border-radius:20px;padding:.45rem 1rem;font-size:.82rem;font-weight:700;cursor:pointer;color:#555;transition:all .15s;white-space:nowrap;}
  .category-pill:hover{border-color:var(--secondary);color:var(--primary);}
  .category-pill.active{background:var(--primary);border-color:var(--primary);color:#fff;}

  .spotlight-card{display:none;align-items:center;justify-content:space-between;gap:1rem;background:linear-gradient(135deg,var(--bg-light),#fff);border:1.5px dashed var(--border-light);border-radius:14px;padding:1rem 1.3rem;margin-bottom:1.5rem;flex-wrap:wrap;}
  .spotlight-card.active{display:flex;}
  .spotlight-face{font-size:1.6rem;font-weight:700;color:var(--primary-dark);}
  .spotlight-label{font-size:.78rem;color:#888;font-weight:700;text-transform:uppercase;letter-spacing:.04em;}

  .compose-card{background:#fff;border:1px solid #e9ecef;border-radius:16px;box-shadow:0 3px 12px rgba(0,0,0,.07);padding:1.3rem;margin-bottom:1.75rem;}
  .compose-card h3{margin:0 0 .8rem;color:var(--primary);font-size:1.05rem;display:flex;align-items:center;gap:.5rem;}
  .compose-textarea{width:100%;min-height:80px;padding:.85rem 1rem;border:1.5px solid #e0e0e0;border-radius:12px;font-size:1.05rem;resize:vertical;outline:none;font-family:inherit;}
  .compose-textarea:focus{border-color:var(--primary);}
  .compose-footer{display:flex;justify-content:space-between;align-items:center;margin-top:.75rem;flex-wrap:wrap;gap:.6rem;}
  .compose-count{font-size:.8rem;color:#888;}
  .compose-actions{display:flex;gap:.6rem;}

  .btn-primary{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;border:none;border-radius:10px;padding:.65rem 1.3rem;font-size:.85rem;font-weight:700;cursor:pointer;transition:all .2s;}
  .btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 16px rgba(216,67,21,.3);}
  .btn-secondary{background:none;border:1.5px solid #d1d5db;color:#666;border-radius:10px;padding:.6rem 1.2rem;font-size:.85rem;font-weight:600;cursor:pointer;transition:all .2s;}
  .btn-secondary:hover{border-color:var(--primary);color:var(--primary);}

  .recent-strip-wrap{margin-bottom:1.75rem;}
  .recent-strip-wrap h4{font-size:.85rem;color:#888;font-weight:700;text-transform:uppercase;letter-spacing:.04em;margin:0 0 .6rem;}
  .recent-strip{display:flex;gap:.5rem;overflow-x:auto;padding-bottom:.3rem;}
  .recent-chip{flex:0 0 auto;background:#fff;border:1.5px solid #e9ecef;border-radius:10px;padding:.5rem .9rem;font-size:1.1rem;cursor:pointer;transition:all .15s;}
  .recent-chip:hover{border-color:var(--primary);transform:translateY(-2px);}

  .kao-section{margin-bottom:2rem;}
  .kao-section-title{display:flex;align-items:center;gap:.5rem;font-size:1.1rem;font-weight:700;color:var(--primary-dark);margin:0 0 1rem;}
  .kao-section-title .cnt{font-size:.75rem;font-weight:700;color:#999;background:#f1f1f1;border-radius:12px;padding:.15rem .6rem;}
  .kao-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:.9rem;}
  .kao-card{background:#fff;border:1.5px solid #e9ecef;border-radius:14px;padding:1.1rem .9rem .8rem;text-align:center;transition:all .2s;position:relative;box-shadow:0 2px 6px rgba(0,0,0,.05);}
  .kao-card:hover{border-color:var(--secondary);box-shadow:0 8px 18px rgba(0,0,0,.1);transform:translateY(-3px);}
  .kao-card.copied{border-color:var(--success);background:#ecfdf5;}
  .kao-face{font-size:1.35rem;font-weight:600;color:#222;cursor:pointer;word-break:break-all;line-height:1.4;display:block;margin-bottom:.6rem;min-height:2.2rem;}
  .kao-actions{display:flex;gap:.4rem;justify-content:center;}
  .kao-btn{border:1.5px solid #e0e0e0;background:#fff;border-radius:8px;padding:.35rem .6rem;font-size:.72rem;font-weight:700;cursor:pointer;color:#666;transition:all .15s;display:flex;align-items:center;gap:.25rem;}
  .kao-btn:hover{border-color:var(--primary);color:var(--primary);}
  .kao-btn.copy-btn:hover{background:var(--primary);border-color:var(--primary);color:#fff;}

  .empty-state{text-align:center;padding:3rem 1rem;color:#999;}
  .empty-state .es-icon{font-size:2.5rem;margin-bottom:.75rem;}

  .note-box{background:var(--bg-light);border:1px solid var(--border-light);border-left:5px solid var(--primary);border-radius:10px;padding:1.05rem 1.3rem;margin:1.6rem auto 0;max-width:950px;font-size:.92rem;color:var(--primary-dark);}
  .note-box a{color:var(--primary);font-weight:700;}

  .toast{position:fixed;bottom:1.6rem;right:1.6rem;background:var(--primary);color:#fff;padding:.9rem 1.6rem;border-radius:14px;font-size:.9rem;font-weight:500;transform:translateY(80px);opacity:0;transition:all .3s;z-index:3000;max-width:330px;box-shadow:0 10px 32px rgba(0,0,0,.25);}
  .toast.show{transform:translateY(0);opacity:1;}
  .toast.success{background:var(--success);}
  .toast.error{background:var(--danger);}

  .steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:1.6rem;margin:2.2rem 0;}
  .step{background:#fff;border:2px solid #e9ecef;border-radius:14px;padding:1.6rem;text-align:center;box-shadow:0 3px 10px rgba(0,0,0,.06);transition:all .3s;}
  .step:hover{transform:translateY(-6px);border-color:var(--secondary);box-shadow:0 10px 24px rgba(0,0,0,.13);}
  .step-number{width:44px;height:44px;border-radius:50%;background:linear-gradient(145deg,var(--primary),var(--secondary));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;margin:0 auto .9rem;font-size:1.15rem;box-shadow:0 4px 10px rgba(216,67,21,.3);}
  .step h3{margin:0 0 .55rem;font-size:1.08rem;color:var(--primary);}
  .step p{margin:0;font-size:.92rem;color:#666;line-height:1.55;}

  .feature-highlight{background:linear-gradient(135deg,var(--primary) 0%,var(--secondary) 100%);color:#fff;border-radius:14px;padding:2.2rem;margin:3rem 0;text-align:center;}
  .feature-highlight h3{margin:0 0 1rem;font-size:1.85rem;}
  .feature-highlight p{margin:0;font-size:1.1rem;opacity:.95;line-height:1.75;}

  .use-case-grid,.feature-grid,.benefits-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1.6rem;margin:2.2rem 0;}
  .use-case-card,.feature-card,.benefit-item{background:#fff;border:2px solid #e9ecef;border-radius:14px;padding:1.6rem;transition:all .3s;box-shadow:0 3px 10px rgba(0,0,0,.08);}
  .use-case-card:hover,.feature-card:hover{transform:translateY(-6px);box-shadow:0 10px 24px rgba(0,0,0,.15);border-color:var(--secondary);}
  .use-case-icon,.feature-icon{font-size:2.5rem;margin-bottom:1rem;display:block;}
  .use-case-card h4,.feature-card h3,.benefit-item h3{margin:0 0 .7rem;color:#333;font-size:1.12rem;}
  .use-case-card p,.feature-card p,.benefit-item p{margin:0;color:#666;line-height:1.65;font-size:.94rem;}
  .benefit-item{border-left:4px solid var(--primary);}
  .benefit-item h3{color:var(--primary-dark);}

  .comparison-table{width:100%;border-collapse:collapse;margin:2.2rem 0;box-shadow:0 3px 12px rgba(0,0,0,.1);border-radius:14px;overflow:hidden;background:#fff;}
  .comparison-table thead{background:linear-gradient(135deg,var(--primary) 0%,var(--secondary) 100%);color:#fff;}
  .comparison-table th{padding:1.2rem 1rem;text-align:left;font-weight:600;font-size:.94rem;}
  .comparison-table td{padding:1rem;border-bottom:1px solid #e9ecef;font-size:.9rem;}
  .comparison-table tbody tr:hover{background:var(--bg-light);}
  .comparison-table tbody tr:last-child td{border-bottom:none;}
  @media screen and (max-width:768px){
    table.comparison-table{display:block!important;width:100%!important;overflow-x:auto!important;-webkit-overflow-scrolling:touch;border-collapse:separate!important;box-shadow:none!important;}
    table.comparison-table thead{display:table-header-group!important;}
    table.comparison-table tbody{display:table-row-group!important;}
    table.comparison-table tr{display:table-row!important;}
    table.comparison-table th,table.comparison-table td{display:table-cell!important;min-width:190px!important;padding:1rem!important;white-space:normal!important;}
  }

  .troubleshoot-item{background:#f8f9fa;border-left:4px solid var(--primary);border-radius:8px;padding:1.1rem 1.3rem;margin-bottom:1.1rem;}
  .troubleshoot-item strong{display:block;color:#333;margin-bottom:.4rem;}
  .troubleshoot-item p{margin:.3rem 0 0;color:#555;font-size:.92rem;line-height:1.65;}
  .tech-faq h4{color:#333;margin:1.6rem 0 .45rem;font-size:1.06rem;}
  .tech-faq p{color:#555;line-height:1.7;margin:0 0 .55rem;}
  .tips-list{list-style:none;padding:0;margin:1.6rem 0;}
  .tips-list li{background:#f8f9fa;border-left:4px solid var(--secondary);border-radius:8px;padding:1rem 1.3rem;margin-bottom:.8rem;color:#444;font-size:.95rem;line-height:1.65;}

  .faq-item{background:#fff;border:1.5px solid #e9ecef;border-radius:12px;margin-bottom:.9rem;overflow:hidden;box-shadow:0 2px 6px rgba(0,0,0,.04);}
  .faq-question{width:100%;text-align:left;background:#fff;border:none;padding:1.05rem 1.3rem;font-size:1rem;font-weight:700;color:var(--primary);cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:1rem;transition:background .2s;}
  .faq-question::after{content:'+';font-size:1.4rem;font-weight:400;color:var(--secondary);transition:transform .25s;}
  .faq-item.active .faq-question::after{transform:rotate(45deg);}
  .faq-question:hover{background:var(--bg-light);}
  .faq-item.active .faq-question{background:var(--primary);color:#fff;}
  .faq-item.active .faq-question::after{color:#fff;}
  .faq-answer{max-height:0;overflow:hidden;transition:max-height .3s ease;padding:0 1.3rem;}
  .faq-item.active .faq-answer{max-height:420px;padding:1rem 1.3rem 1.15rem;}
  .faq-answer p{margin:0;color:#555;font-size:.95rem;line-height:1.7;}

  .related-tools-section{margin:3.2rem 0;}
  .related-tools-subtitle{text-align:center;color:#666;font-size:.98rem;margin:0 0 2.1rem;}
  .related-tools-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1.3rem;}
  .related-tool-card{background:#fff;border:2px solid #e9ecef;border-top:4px solid var(--secondary);border-radius:14px;padding:1.6rem;text-decoration:none;display:block;transition:all .3s;box-shadow:0 3px 10px rgba(0,0,0,.06);}
  .related-tool-card:hover{transform:translateY(-6px);box-shadow:0 12px 26px rgba(216,67,21,.18);border-top-color:var(--primary);}
  .related-tool-icon{font-size:2.3rem;margin-bottom:.8rem;display:block;}
  .related-tool-card h4{margin:0 0 .55rem;color:var(--primary);font-size:1.1rem;}
  .related-tool-card p{margin:0 0 .9rem;color:#666;line-height:1.6;font-size:.89rem;}
  .related-tool-link{font-size:.86rem;font-weight:700;color:var(--primary);display:inline-flex;align-items:center;gap:.3rem;}
  .related-tool-card:hover .related-tool-link{color:var(--secondary);}
  .related-tool-card.view-all{background:linear-gradient(135deg,var(--primary) 0%,var(--secondary) 100%);border-top-color:transparent;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;color:#fff;}
  .related-tool-card.view-all h4,.related-tool-card.view-all p,.related-tool-card.view-all .related-tool-link{color:#fff;}

  footer{text-align:center;padding:2.2rem 1.25rem;color:#888;font-size:.9rem;background:#f8f9fa;margin-top:2rem;}
  footer a{color:var(--primary);text-decoration:none;font-weight:600;}
  footer a:hover{text-decoration:underline;}

  @media (max-width:768px){
    header h1{font-size:1.7rem;}
    .use-case-grid,.feature-grid,.benefits-grid,.steps{grid-template-columns:1fr;}
    .toc ul{columns:1;}
    .related-tools-grid{grid-template-columns:repeat(auto-fit,minmax(160px,1fr));}
    .kao-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));}
  }