:root{--primary:#5B4BDB;--primary-soft:#8B7CF6;--ink:#1E1B2E;--text:#292734;--muted:#6F6B7A;--bg:#F7F7FB;--soft:#EFEFFC;--accent:#F05A7E;--white:#fff;--border:#deddf0;--shadow:0 18px 45px rgba(30,27,46,.08);--radius:22px;--shell:min(1160px,calc(100% - 40px))}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg);line-height:1.7}img{max-width:100%;height:auto;display:block}a{color:inherit;text-decoration:none}button,input{font:inherit}.site-shell{width:var(--shell);margin:0 auto}.skip-link{position:absolute;left:12px;top:-80px;background:var(--ink);color:#fff;padding:10px 14px;border-radius:8px;z-index:1000}.skip-link:focus{top:12px}.site-header{position:sticky;top:0;z-index:100;background:rgba(247,247,251,.94);backdrop-filter:blur(14px);border-bottom:1px solid rgba(222,221,240,.9)}.header-row{min-height:76px;display:flex;align-items:center;gap:28px}.brand{display:flex;align-items:center;gap:10px;min-width:190px}.brand img{width:46px;height:46px;object-fit:contain}.brand span{display:flex;flex-direction:column;line-height:1.1}.brand strong{font-size:1.2rem;color:var(--ink)}.brand small{color:var(--muted);margin-top:5px}.primary-nav{margin-left:auto;display:flex;align-items:center;gap:6px;flex-wrap:wrap}.primary-nav a{padding:10px 12px;border-radius:12px;color:var(--muted);font-size:.95rem}.primary-nav a:hover,.primary-nav a[aria-current=page]{background:var(--soft);color:var(--primary)}.menu-button{display:none;margin-left:auto;border:1px solid var(--border);background:#fff;border-radius:12px;padding:9px 13px;color:var(--ink)}.hero{padding:78px 0 64px;background:radial-gradient(circle at 82% 10%,rgba(139,124,246,.15),transparent 32%),linear-gradient(180deg,#fff 0%,var(--bg) 100%)}.hero-grid,.page-hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:60px;align-items:center}.eyebrow,.section-kicker{display:inline-flex;align-items:center;color:var(--primary);font-weight:750;letter-spacing:.06em;font-size:.84rem;text-transform:uppercase}.eyebrow:before,.section-kicker:before{content:"";width:26px;height:2px;background:var(--accent);margin-right:9px;border-radius:2px}h1,h2,h3{color:var(--ink);line-height:1.18;margin-top:0}h1{font-size:clamp(2.45rem,5vw,4.65rem);letter-spacing:-.045em;margin:.45em 0 .3em}h2{font-size:clamp(1.65rem,3vw,2.55rem);letter-spacing:-.025em;margin:.35em 0 .55em}h3{font-size:1.15rem;margin:.2em 0 .45em}.lead{font-size:1.18rem;color:#4d495b;max-width:780px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:28px 0}.button{display:inline-flex;align-items:center;justify-content:center;padding:12px 18px;border-radius:14px;font-weight:750;border:1px solid transparent;transition:transform .2s ease,box-shadow .2s ease}.button:hover{transform:translateY(-2px)}.button.primary{background:var(--primary);color:#fff;box-shadow:0 12px 28px rgba(91,75,219,.24)}.button.secondary{background:#fff;color:var(--ink);border-color:var(--border)}.hero-points{display:flex;gap:12px 22px;flex-wrap:wrap;padding:0;margin:26px 0 0;list-style:none;color:var(--muted);font-size:.95rem}.hero-points li:before{content:"•";color:var(--accent);margin-right:8px}.hero-media{margin:0;padding:18px;background:#fff;border:1px solid var(--border);border-radius:30px;box-shadow:var(--shadow);transform:rotate(1.5deg)}.hero-media img,.page-hero img,.feature-row img,.mobile-callout img{border-radius:20px;object-fit:cover}.section{padding:72px 0}.compact-section{padding-top:30px}.split-intro{display:grid;grid-template-columns:.8fr 1.2fr;gap:50px;align-items:start}.route-panel{display:grid;gap:12px}.route-panel.three{grid-template-columns:repeat(3,1fr)}.route-panel a{display:flex;flex-direction:column;gap:4px;padding:18px 20px;background:#fff;border:1px solid var(--border);border-radius:16px;transition:border-color .2s ease,transform .2s ease}.route-panel a:hover{border-color:var(--primary-soft);transform:translateX(4px)}.route-panel strong{color:var(--ink)}.route-panel span{color:var(--muted);font-size:.94rem}.soft-band{background:var(--soft);border-top:1px solid #e7e5f8;border-bottom:1px solid #e7e5f8}.section-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:26px}.text-link{color:var(--primary);font-weight:750}.text-link:after{content:" →"}.feature-row{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center}.feature-row img{background:#dddcef;box-shadow:var(--shadow)}.check-list{list-style:none;padding:0;margin:24px 0}.check-list li{padding:8px 0 8px 28px;position:relative}.check-list li:before{content:"✓";position:absolute;left:0;color:var(--primary);font-weight:800}.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.video-card{background:#fff;border:1px solid var(--border);border-radius:18px;padding:20px;min-height:230px;display:flex;flex-direction:column}.video-card>span{align-self:flex-start;background:var(--soft);color:var(--primary);padding:4px 9px;border-radius:999px;font-size:.76rem;font-weight:800}.video-card h3{margin-top:16px}.video-card p{color:var(--muted);font-size:.95rem}.video-card a{margin-top:auto;color:var(--primary);font-weight:750}.mobile-callout{display:grid;grid-template-columns:1.2fr .8fr;gap:44px;align-items:center;background:#fff;border:1px solid var(--border);padding:36px;border-radius:26px;box-shadow:var(--shadow)}.mobile-callout img{max-height:330px;margin-left:auto}.notes-list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.note-item{background:#fff;border:1px solid var(--border);border-radius:16px;padding:20px}.note-item p{margin:.45em 0}.muted{color:var(--muted);font-size:.94rem}.breadcrumbs{padding:20px 0 0}.breadcrumbs ol{display:flex;gap:8px;list-style:none;padding:0;margin:0;color:var(--muted);font-size:.9rem}.breadcrumbs li:not(:last-child):after{content:"/";margin-left:8px;color:#aaa6b5}.breadcrumbs a:hover{color:var(--primary)}.page-hero{padding:48px 0 60px}.page-hero h1{font-size:clamp(2.2rem,4.7vw,4rem)}.simple-hero{padding-bottom:26px}.info-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.info-card{background:#fff;border:1px solid var(--border);border-radius:18px;padding:24px}.info-card h2{font-size:1.35rem}.faq-list{max-width:900px}.faq-list details{background:#fff;border:1px solid var(--border);border-radius:16px;padding:0 20px;margin:12px 0}.faq-list summary{cursor:pointer;font-weight:800;color:var(--ink);padding:18px 0}.faq-list details p{padding:0 0 18px;margin:0;color:var(--muted)}.not-found{padding:120px 0;min-height:62vh;display:flex;align-items:center}.error-code{display:block;font-size:clamp(5rem,16vw,10rem);line-height:.8;color:var(--soft);font-weight:900;letter-spacing:-.06em}.site-footer{margin-top:40px;background:var(--ink);color:#d9d6e5;padding:50px 0 22px}.footer-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}.site-footer strong{color:#fff;font-size:1.25rem}.site-footer nav{display:grid;grid-template-columns:repeat(2,1fr);gap:8px 20px}.site-footer a:hover{color:#fff}.copyright{margin-top:28px;padding-top:18px;border-top:1px solid rgba(255,255,255,.12);font-size:.85rem;color:#a7a3b3}.back-top{position:fixed;right:20px;bottom:20px;width:44px;height:44px;border-radius:50%;border:1px solid var(--border);background:#fff;color:var(--primary);box-shadow:var(--shadow);opacity:0;pointer-events:none;transform:translateY(8px);transition:.2s}.back-top.show{opacity:1;pointer-events:auto;transform:none}:focus-visible{outline:3px solid rgba(240,90,126,.45);outline-offset:3px}@media(max-width:900px){:root{--shell:min(100% - 28px,760px)}.header-row{min-height:68px}.menu-button{display:inline-flex}.primary-nav{display:none;position:absolute;left:14px;right:14px;top:68px;padding:12px;background:#fff;border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow);flex-direction:column;align-items:stretch}.primary-nav.open{display:flex}.primary-nav a{padding:12px 14px}.hero{padding-top:48px}.hero-grid,.page-hero-grid,.split-intro,.feature-row,.mobile-callout{grid-template-columns:1fr}.hero-media{transform:none}.video-grid{grid-template-columns:repeat(2,1fr)}.notes-list{grid-template-columns:1fr}.route-panel.three{grid-template-columns:1fr}.page-hero img{max-height:360px;width:100%;object-fit:cover}.mobile-callout img{margin:0 auto;max-height:280px}.section{padding:54px 0}.section-head{align-items:flex-start;flex-direction:column}.footer-grid{grid-template-columns:1fr}}@media(max-width:560px){h1{font-size:2.45rem}.hero-actions{flex-direction:column}.button{width:100%}.video-grid,.info-grid{grid-template-columns:1fr}.hero-points{display:grid;gap:6px}.site-footer nav{grid-template-columns:1fr}.feature-row{gap:24px}.mobile-callout{padding:24px}.section{padding:44px 0}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}.hero-media{transform:none!important}}

.scenario-list{columns:2;column-gap:18px}.scenario-item{break-inside:avoid;background:#fff;border:1px solid var(--border);border-radius:16px;padding:20px;margin:0 0 18px}.scenario-item h3{font-size:1.08rem}.scenario-item p{margin:.4em 0}.scenario-item .muted{padding-top:8px;border-top:1px dashed var(--border)}@media(max-width:760px){.scenario-list{columns:1}}

/* Additional responsive refinements for long-form guide content. */
.guide-density{display:grid;grid-template-columns:minmax(0,1fr) minmax(240px,.38fr);gap:28px;align-items:start}.guide-aside{position:sticky;top:96px;background:#fff;border:1px solid var(--border);border-radius:16px;padding:18px}.guide-aside ul{list-style:none;padding:0;margin:0}.guide-aside li+li{margin-top:8px}.guide-aside a{display:block;padding:8px 10px;border-radius:10px;color:var(--muted)}.guide-aside a:hover{background:var(--soft);color:var(--primary)}.content-sequence{display:grid;gap:14px}.content-sequence article{background:#fff;border:1px solid var(--border);border-radius:18px;padding:22px}.content-sequence article>header{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:10px}.content-sequence .sequence-label{font-size:.78rem;font-weight:800;color:var(--primary);background:var(--soft);padding:4px 8px;border-radius:999px}.inline-meta{display:flex;flex-wrap:wrap;gap:8px 14px;color:var(--muted);font-size:.88rem}.inline-meta span{display:inline-flex;align-items:center}.inline-meta span:before{content:"";width:5px;height:5px;background:var(--primary-soft);border-radius:50%;margin-right:7px}.callout-note{border-left:4px solid var(--primary);background:#fff;padding:16px 18px;border-radius:0 14px 14px 0}.callout-note strong{color:var(--ink)}.plain-list{margin:18px 0;padding-left:1.25rem}.plain-list li+li{margin-top:8px}.page-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}.quiet-divider{height:1px;background:var(--border);margin:28px 0}.mini-index{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.mini-index a{display:block;background:#fff;border:1px solid var(--border);border-radius:12px;padding:12px 14px}.mini-index a:hover{border-color:var(--primary-soft)}@media(max-width:900px){.guide-density{grid-template-columns:1fr}.guide-aside{position:static}.content-sequence article>header{align-items:flex-start;flex-direction:column}}@media(max-width:560px){.mini-index{grid-template-columns:1fr}.content-sequence article{padding:18px}.guide-aside{padding:14px}}