.decision-tree{border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--canvas);margin:28px 0 32px;overflow:hidden}.tree-item{border-bottom:1px solid var(--border-light);align-items:flex-start;gap:16px;padding:16px 22px;font-size:15px;line-height:1.6;display:flex}.tree-item:last-child{border-bottom:none}.tree-cond{color:var(--ink-secondary);flex:1}.tree-arrow{color:var(--ink-tertiary);flex-shrink:0;padding-top:1px;font-weight:700}.tree-result{text-align:right;flex-shrink:0;min-width:96px}.tree-badge{white-space:nowrap;border-radius:20px;padding:3px 12px;font-size:13px;font-weight:700;display:inline-block}.tree-badge-ai{background:var(--accent-light);color:var(--accent)}.tree-badge-human{color:#b42318;background:#fef3f2}.tree-best{background:var(--success-light)}.tree-best .tree-cond{color:var(--ink);font-weight:600}.tree-best .tree-badge{background:var(--success);color:#fff}@media (max-width:1024px){.footer-inner{grid-template-columns:1fr 1fr}}@media (max-width:768px){.nav-links{display:none}.article-body{font-size:16px}.tree-item{flex-wrap:wrap;gap:8px}.tree-result{text-align:left;min-width:0}.footer-inner{grid-template-columns:1fr;gap:32px}.footer-bottom{text-align:center;flex-direction:column;gap:12px}}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}@media print{.nav,.article-cta{display:none}.article-body h2,.article-body h3,.decision-tree{break-inside:avoid}}.layer-grid{grid-template-columns:1fr 1fr;gap:14px;margin:24px 0 32px;display:grid}.layer-card{border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--canvas);align-items:flex-start;gap:14px;padding:18px;transition:border-color .2s,box-shadow .2s;display:flex}.layer-card:hover{border-color:var(--accent);box-shadow:var(--shadow-sm)}.layer-num{background:var(--accent-light);width:30px;height:30px;color:var(--accent);border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;font-size:14px;font-weight:800;display:flex}.layer-card h4{color:var(--ink);margin-bottom:4px;font-size:15px;font-weight:700}.layer-card p{color:var(--ink-secondary);margin:0;font-size:13px;line-height:1.6}.method-grid{grid-template-columns:1fr 1fr;gap:16px;margin:24px 0 32px;display:grid}.method-card{border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--surface);padding:22px 20px}.method-card-head{align-items:center;gap:10px;margin-bottom:10px;display:flex}.method-num{background:var(--accent);color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:26px;height:26px;font-size:13px;font-weight:700;display:flex}.method-card h4{color:var(--ink);font-size:15px;font-weight:700}.method-card p{color:var(--ink-secondary);margin:0;font-size:13.5px;line-height:1.65}.ratio-bar{border-radius:var(--radius);border:1px solid var(--border);height:44px;margin:20px 0 10px;display:flex;overflow:hidden}.ratio-real{background:var(--accent);color:#fff;justify-content:center;align-items:center;width:15%;font-size:13px;font-weight:700;display:flex}.ratio-virtual{background:var(--surface-alt);width:85%;color:var(--ink-secondary);justify-content:center;align-items:center;font-size:13px;font-weight:700;display:flex}.ratio-legend{color:var(--ink-tertiary);gap:20px;margin-bottom:28px;font-size:13px;display:flex}.ratio-legend span:before{content:"";vertical-align:-1px;border-radius:3px;width:10px;height:10px;margin-right:6px;display:inline-block}.legend-real:before{background:var(--accent)}.legend-virtual:before{background:var(--surface-alt);border:1px solid var(--border)}.source-list{border:1px solid var(--border);border-radius:var(--radius-lg);margin:20px 0 28px;padding:0;list-style:none;overflow:hidden}.source-list li{border-bottom:1px solid var(--border-light);align-items:flex-start;gap:14px;margin:0;padding:16px 22px;font-size:14.5px;line-height:1.65;display:flex}.source-list li:last-child{border-bottom:none}.source-tag{background:var(--accent-light);color:var(--accent);border-radius:4px;flex-shrink:0;margin-top:2px;padding:2px 10px;font-size:12px;font-weight:700;display:inline-block}.source-list strong{color:var(--ink)}.scope-grid{grid-template-columns:1fr 1fr;gap:16px;margin:24px 0 32px;display:grid}.scope-card{border-radius:var(--radius-lg);border:1px solid var(--border);padding:22px 22px 18px}.scope-yes{background:var(--success-light);border-color:#c6f6d5}.scope-no{background:#fef3f2;border-color:#fbd5d0}.scope-card h4{align-items:center;gap:8px;margin-bottom:12px;font-size:15px;font-weight:700;display:flex}.scope-yes h4{color:var(--success)}.scope-no h4{color:#b42318}.scope-card ul{margin:0;padding:0;list-style:none}.scope-card li{color:var(--ink-secondary);margin-bottom:8px;padding-left:20px;font-size:13.5px;line-height:1.6;position:relative}.scope-yes li:before{content:"✓";color:var(--success);font-weight:700;position:absolute;left:0}.scope-no li:before{content:"✕";color:#b42318;font-weight:700;position:absolute;left:0}@media (max-width:1024px){.footer-inner{grid-template-columns:1fr 1fr}}@media (max-width:768px){.nav-links{display:none}.article-body{font-size:16px}.layer-grid,.method-grid,.scope-grid{grid-template-columns:1fr}.footer-inner{grid-template-columns:1fr;gap:32px}.footer-bottom{text-align:center;flex-direction:column;gap:12px}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}@media print{.nav,.article-cta{display:none}.article-body h2,.article-body h3,.layer-card,.method-card,.scope-card{break-inside:avoid}}:root{--canvas:#fff;--surface:#f7fafd;--surface-alt:#f1f5fb;--ink:#041a38;--ink-secondary:#5f6b7c;--ink-tertiary:#8fa0b5;--accent:#1269ff;--accent-dark:#0d5be0;--accent-light:#eaf3ff;--accent-glow:#1269ff14;--success:#08796a;--success-light:#e6f5f2;--violet:#7b5cff;--violet-light:#efecff;--cyan:#14c0cc;--gradient-brand:linear-gradient(135deg, #1269ff 0%, #14c0cc 100%);--gradient-dark:linear-gradient(135deg, #092e58 0%, #041a38 72%, #071d42 100%);--border:#d8e4f2;--border-light:#e9f0f9;--shadow-sm:0 1px 3px #041a380d;--shadow-md:0 4px 12px #041a3814;--shadow-lg:0 8px 30px #041a381a;--radius:8px;--radius-lg:12px;--radius-xl:16px;--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;--max-w:1200px;--article-w:720px;--section-gap:clamp(64px, 8vw, 96px)}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font-sans);color:var(--ink);background:var(--canvas);-webkit-font-smoothing:antialiased;font-size:16px;line-height:1.6;overflow-x:hidden}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-dark)}img{max-width:100%;height:auto}.nav{z-index:100;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border-light);background:#ffffffeb;position:sticky;top:0}.nav-inner{max-width:var(--max-w);justify-content:space-between;align-items:center;height:64px;margin:0 auto;padding:0 24px;display:flex}.nav-brand{color:var(--ink);align-items:center;gap:8px;font-size:18px;font-weight:700;display:flex}.nav-brand:hover{color:var(--ink)}.nav-brand span{color:var(--accent)}.nav-links{align-items:center;gap:28px;display:flex}.nav-links a{color:var(--ink-secondary);font-size:14px;font-weight:500;transition:color .2s}.nav-links a:hover{color:var(--accent)}.nav-cta{background:var(--accent);border-radius:6px;align-items:center;gap:6px;padding:8px 18px;font-size:14px;font-weight:600;transition:background .2s,transform .15s;display:inline-flex;color:#fff!important}.nav-cta:hover{background:var(--accent-dark);transform:translateY(-1px)}.btn-primary{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:8px;align-items:center;gap:6px;padding:14px 28px;font-size:16px;font-weight:600;transition:all .2s;display:inline-flex;box-shadow:0 4px 14px #2563eb40}.btn-primary:hover{background:var(--accent-dark);color:#fff;transform:translateY(-1px);box-shadow:0 6px 20px #2563eb4d}.article-hero{background:linear-gradient(180deg, var(--surface) 0%, var(--canvas) 100%);padding:clamp(40px,6vw,64px) 24px clamp(32px,4vw,48px)}.article-hero-inner{max-width:var(--article-w);margin:0 auto}.article-back{color:var(--ink-secondary);margin-bottom:28px;font-size:14px;font-weight:500;transition:color .2s;display:inline-block}.article-back:hover{color:var(--accent)}.article-meta{flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:20px;display:flex}.article-tag{background:var(--accent-light);color:var(--accent);border-radius:4px;padding:4px 12px;font-size:12px;font-weight:600;display:inline-block}.article-date,.article-readtime{color:var(--ink-tertiary);font-size:13px}.article-meta .dot{background:var(--ink-tertiary);border-radius:50%;width:3px;height:3px}.article-hero h1{letter-spacing:-.01em;color:var(--ink);font-size:clamp(26px,4vw,40px);font-weight:800;line-height:1.25}.article-body{max-width:var(--article-w);color:var(--ink-secondary);margin:0 auto;padding:clamp(32px,4vw,48px) 24px 0;font-size:17px;line-height:1.8}.article-body p{margin-bottom:24px}.article-body p.lead{color:var(--ink);font-size:18px;line-height:1.75}.article-body h2{color:var(--ink);border-left:4px solid var(--accent);margin:48px 0 20px;padding-left:14px;font-size:24px;font-weight:800;line-height:1.4}.article-body h3{color:var(--ink);margin:32px 0 12px;font-size:18px;font-weight:700;line-height:1.5}.article-body ul,.article-body ol{margin:0 0 24px;padding-left:24px}.article-body li{margin-bottom:10px;line-height:1.75}.article-body li::marker{color:var(--accent);font-weight:600}.article-body strong{color:var(--ink);font-weight:700}.article-body blockquote{background:var(--accent-light);border-left:4px solid var(--accent);border-radius:0 var(--radius) var(--radius) 0;color:var(--ink);margin:28px 0;padding:20px 24px;font-size:16px;line-height:1.75}.article-body blockquote p:last-child{margin-bottom:0}.old-flow{border:1px solid var(--border);border-radius:var(--radius-lg);margin:20px 0 32px;overflow:hidden}.old-flow-item{border-bottom:1px solid var(--border-light);align-items:flex-start;gap:16px;padding:14px 22px;font-size:14.5px;line-height:1.6;display:flex}.old-flow-item:last-child{border-bottom:none}.old-week{color:var(--ink-tertiary);flex-shrink:0;min-width:52px;font-weight:800}.timeline{margin:24px 0 32px}.tl-item{gap:18px;padding-bottom:22px;display:flex;position:relative}.tl-item:last-child{padding-bottom:0}.tl-item:not(:last-child):before{content:"";background:var(--border);width:2px;position:absolute;top:34px;bottom:0;left:15px}.tl-dot{background:var(--accent-light);width:32px;height:32px;color:var(--accent);border:2px solid var(--accent);z-index:1;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:12px;font-weight:800;display:flex}.tl-content{padding-top:3px}.tl-content h4{color:var(--ink);margin-bottom:3px;font-size:15.5px;font-weight:700}.tl-content p{color:var(--ink-secondary);margin:0;font-size:14px;line-height:1.65}.chat-demo{background:linear-gradient(135deg, var(--accent-light) 0%, #f0e6ff 100%);border-radius:var(--radius-lg);flex-direction:column;gap:12px;margin:20px 0 28px;padding:22px;display:flex}.chat-bubble{border-radius:12px;max-width:88%;padding:12px 16px;font-size:14px;line-height:1.6}.chat-bubble-ai{background:var(--canvas);border:1px solid var(--border);box-shadow:var(--shadow-sm);align-self:flex-start}.chat-bubble-user{background:var(--accent);color:#fff;align-self:flex-end}.chat-caption{color:var(--ink-tertiary);margin:-16px 0 28px 4px;font-size:13px}.factor-grid{grid-template-columns:1fr 1fr;gap:16px;margin:20px 0 28px;display:grid}.factor-card{border-radius:var(--radius-lg);border:1px solid var(--border);padding:22px}.factor-card h4{align-items:center;gap:8px;margin-bottom:12px;font-size:14px;font-weight:700;display:flex}.factor-up{background:var(--success-light);border-color:#c6f6d5}.factor-up h4{color:var(--success)}.factor-down{background:#fef3f2;border-color:#fbd5d0}.factor-down h4{color:#b42318}.factor-card ol{margin:0;padding-left:20px}.factor-card li{color:var(--ink-secondary);margin-bottom:6px;font-size:13.5px;line-height:1.6}.data-table-wrap{border:1px solid var(--border);border-radius:var(--radius-lg);margin:20px 0 12px;overflow-x:auto}.data-table{border-collapse:collapse;width:100%;min-width:480px;font-size:14px}.data-table th,.data-table td{text-align:left;border-bottom:1px solid var(--border-light);padding:13px 18px}.data-table th{background:var(--surface);color:var(--ink);font-size:13px;font-weight:700}.data-table tr:last-child td{border-bottom:none}.data-table td{color:var(--ink-secondary)}.data-table td strong{color:var(--accent)}.table-note{color:var(--ink-tertiary);margin:0 0 28px;font-size:12.5px}.role-shift{grid-template-columns:1fr 1fr;gap:16px;margin:20px 0 28px;display:grid}.role-card{border-radius:var(--radius-lg);border:1px solid var(--border);padding:22px}.role-before{background:var(--surface)}.role-after{background:var(--accent-light);border-color:#bfdbfe}.role-card h4{color:var(--ink);margin-bottom:12px;font-size:14px;font-weight:700}.role-card ul{margin:0;padding:0;list-style:none}.role-card li{color:var(--ink-secondary);margin-bottom:8px;padding-left:22px;font-size:13.5px;line-height:1.6;position:relative}.role-before li:before{content:"—";color:var(--ink-tertiary);font-weight:700;position:absolute;left:0}.role-after li:before{content:"→";color:var(--accent);font-weight:700;position:absolute;left:0}.article-cta{max-width:var(--article-w);background:var(--accent-light);border-radius:var(--radius-xl);text-align:center;margin:56px auto 0;padding:36px 32px}.article-cta h2{color:var(--ink);border:none;margin-bottom:10px;padding:0;font-size:22px;font-weight:800}.article-cta p{color:var(--ink-secondary);margin-bottom:24px;font-size:15px;line-height:1.65}.article-footer-nav{max-width:var(--article-w);border-top:1px solid var(--border-light);margin:40px auto 0;padding:24px 0 8px}.footer{margin-top:var(--section-gap);background:var(--ink);color:#ffffffb3;padding:48px 24px 32px}.footer-inner{max-width:var(--max-w);grid-template-columns:2fr 1fr 1fr 1fr;gap:48px;margin:0 auto;display:grid}.footer-brand{color:#fff;margin-bottom:12px;font-size:18px;font-weight:700}.footer-desc{max-width:280px;font-size:14px;line-height:1.6}.footer h4{color:#fff;margin-bottom:16px;font-size:14px;font-weight:600}.footer-links{flex-direction:column;gap:10px;list-style:none;display:flex}.footer-links a{color:#fff9;font-size:14px;transition:color .2s}.footer-links a:hover{color:#fff}.footer-bottom{max-width:var(--max-w);border-top:1px solid #ffffff1a;justify-content:space-between;align-items:center;margin:32px auto 0;padding-top:24px;font-size:13px;display:flex}@media (max-width:1024px){.footer-inner{grid-template-columns:1fr 1fr}}@media (max-width:768px){.nav-links{display:none}.article-body{font-size:16px}.factor-grid,.role-shift{grid-template-columns:1fr}.chat-bubble{max-width:95%}.footer-inner{grid-template-columns:1fr;gap:32px}.footer-bottom{text-align:center;flex-direction:column;gap:12px}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}a:focus-visible,button:focus-visible,summary:focus-visible,details:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}@media print{.nav,.article-cta{display:none}.article-body h2,.article-body h3,.tl-item,.factor-card,.role-card,.data-table-wrap{break-inside:avoid}}