:root{--brand:#4f46e5;--brand-dark:#4338ca;--brand-soft:#eef2ff;--ink:#0f172a;--ink-2:#334155;--muted:#64748b;--line:#e2e8f0;--bg:#fff;--bg-2:#f8fafc;--ok:#059669;--warn:#d97706;--radius:10px;--shadow:0 1px 2px #0f172a0f, 0 4px 16px #0f172a0f;--font:system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", "Noto Sans CJK TC", "PingFang TC", "Microsoft JhengHei", "Hiragino Sans", "Meiryo", "Malgun Gothic", sans-serif}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{font-family:var(--font);color:var(--ink);background:var(--bg);margin:0;font-size:16px;line-height:1.6}img{max-width:100%;height:auto}a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3,h4{margin:1.4em 0 .5em;line-height:1.25}h1{letter-spacing:-.02em;margin-top:.6em;font-size:clamp(1.8rem,4vw,2.6rem)}h2{letter-spacing:-.01em;font-size:clamp(1.35rem,2.6vw,1.75rem)}h3{font-size:1.15rem}p{margin:0 0 1em}.container{width:100%;max-width:1180px;margin:0 auto;padding:0 16px}.narrow{max-width:780px}.muted{color:var(--muted)}.small{font-size:.875rem}.center{text-align:center}.btn{border:1px solid var(--line);color:var(--ink);font:inherit;cursor:pointer;background:#fff;border-radius:8px;justify-content:center;align-items:center;gap:6px;padding:10px 18px;font-weight:600;transition:background .15s,border-color .15s,transform 50ms;display:inline-flex;text-decoration:none!important}.btn:active{transform:translateY(1px)}.btn-primary{background:var(--brand);border-color:var(--brand);color:#fff}.btn-primary:hover{background:var(--brand-dark)}.btn-pro{color:#fff;background:linear-gradient(135deg,#f59e0b,#ef4444);border:0;padding:7px 14px;font-size:.9rem}.btn-lg{padding:14px 26px;font-size:1.05rem}.btn-block{width:100%}.site-header{z-index:50;backdrop-filter:saturate(180%)blur(8px);border-bottom:1px solid var(--line);background:#ffffffeb;position:sticky;top:0}.header-inner{align-items:center;gap:20px;height:60px;display:flex}.brand{color:var(--ink);align-items:center;gap:8px;font-size:1.15rem;font-weight:800;display:inline-flex}.brand:hover{text-decoration:none}.main-nav{scrollbar-width:none;flex:1;gap:4px;display:flex;overflow-x:auto}.main-nav a{color:var(--ink-2);white-space:nowrap;border-radius:6px;padding:6px 10px;font-size:.95rem}.main-nav a:hover{background:var(--bg-2);text-decoration:none}.header-actions{align-items:center;gap:10px;display:flex}.lang-switch{position:relative}.lang-switch summary{cursor:pointer;color:var(--ink-2);white-space:nowrap;border-radius:6px;padding:6px 10px;font-size:.9rem;list-style:none}.lang-switch summary::-webkit-details-marker{display:none}.lang-switch ul{border:1px solid var(--line);box-shadow:var(--shadow);background:#fff;border-radius:8px;min-width:180px;max-height:70vh;margin:0;padding:6px;list-style:none;position:absolute;top:110%;right:0;overflow:auto}.lang-switch li a{color:var(--ink-2);border-radius:6px;padding:6px 10px;display:block}.lang-switch li a[aria-current]{background:var(--brand-soft);color:var(--brand);font-weight:600}.pro-badge{color:#fff;background:linear-gradient(135deg,#f59e0b,#ef4444);border-radius:999px;padding:3px 8px;font-size:.75rem;font-weight:800}@media (width<=860px){.header-inner{flex-wrap:wrap;gap:8px;height:auto;padding-top:8px;padding-bottom:4px}.main-nav{flex-basis:100%;order:3}.header-actions{margin-left:auto}}.site-footer{border-top:1px solid var(--line);background:var(--bg-2);margin-top:64px;padding:40px 0 24px}.footer-grid{grid-template-columns:2fr 1fr 1fr 1fr;gap:24px;display:grid}.footer-grid h4{margin:0 0 8px;font-size:.95rem}.footer-grid ul{margin:0;padding:0;list-style:none}.footer-grid li{margin:4px 0}.footer-grid a{color:var(--ink-2);font-size:.92rem}.footer-bottom{border-top:1px solid var(--line);margin-top:24px;padding-top:16px}@media (width<=720px){.footer-grid{grid-template-columns:1fr 1fr}.footer-grid>:first-child{grid-column:1/-1}}.hero{text-align:center;padding:36px 0 12px}.hero p.lead{color:var(--ink-2);max-width:720px;margin:0 auto 12px;font-size:1.12rem}.card{border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);background:#fff;padding:20px}.grid-3{grid-template-columns:repeat(3,1fr);gap:16px;display:grid}.grid-2{grid-template-columns:repeat(2,1fr);gap:16px;display:grid}@media (width<=860px){.grid-3{grid-template-columns:1fr 1fr}}@media (width<=560px){.grid-3,.grid-2{grid-template-columns:1fr}}.prose{max-width:760px}.prose h2{margin-top:1.8em}.prose ul,.prose ol{padding-left:1.3em}.prose li{margin:.3em 0}.prose table{border-collapse:collapse;width:100%;margin:1em 0;font-size:.95rem}.prose th,.prose td{border:1px solid var(--line);text-align:left;vertical-align:top;padding:8px 10px}.prose th{background:var(--bg-2)}.prose blockquote{border-left:4px solid var(--brand);background:var(--brand-soft);border-radius:0 8px 8px 0;margin:1em 0;padding:12px 16px}.breadcrumbs{color:var(--muted);margin:16px 0 0;font-size:.85rem}.breadcrumbs a{color:var(--muted)}.faq details{border:1px solid var(--line);background:#fff;border-radius:8px;margin:8px 0;padding:12px 16px}.faq summary{cursor:pointer;font-weight:600}.chip{background:var(--brand-soft);color:var(--brand);border-radius:999px;padding:2px 10px;font-size:.8rem;font-weight:600;display:inline-block}.cta-band{background:linear-gradient(135deg, var(--brand), #7c3aed);color:#fff;text-align:center;border-radius:14px;margin:40px 0;padding:28px}.cta-band h2{color:#fff;margin-top:0}.cta-band .btn{color:var(--brand);background:#fff;border:0}[hidden]{display:none!important}.cap{display:inline-block}.cap:first-letter{text-transform:uppercase}