:root{--bg:#f6f8fc;--surface:#fff;--text:#182338;--muted:#68758a;--line:#e4e9f2;--blue:#1667ec;--shadow:0 8px 30px rgba(25,50,90,.06)}*{box-sizing:border-box}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.55}a{color:inherit;text-decoration:none}.wrap{max-width:1180px;margin:auto;padding-left:22px;padding-right:22px}.top{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}.nav{display:flex;align-items:center;justify-content:space-between;min-height:72px;gap:18px}.logo{font-weight:850;font-size:23px;white-space:nowrap}.logo span{color:var(--blue)}nav{display:flex;gap:24px}nav a{font-size:14px;font-weight:600}nav a:hover,.side a:hover{color:var(--blue)}button{border:1px solid var(--line);background:var(--surface);border-radius:10px;padding:8px 12px;cursor:pointer;color:var(--text)}.hero{margin-top:28px;border-radius:20px;background:linear-gradient(105deg,#0d2451,#135bd5 70%,#3793fa);color:#fff;overflow:hidden}.hero-inner{padding:72px 7%;max-width:800px}.eyebrow{letter-spacing:.13em;font-size:12px;font-weight:800;opacity:.8}.hero h1{font-size:clamp(34px,5vw,58px);line-height:1.13;margin:14px 0}.hero p{font-size:18px;opacity:.9;max-width:550px}.search{width:100%;max-width:610px;padding:17px 19px;border:1px solid var(--line);border-radius:12px;background:var(--surface);color:var(--text);font:inherit;outline:none}.hero .search{margin-top:20px}.section-title,.heading{margin-top:40px}.section-title,.heading h2{font-size:25px}.heading{display:flex;align-items:center;justify-content:space-between}.heading span{color:var(--muted)}.platform-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:15px}.platform-card,.guide-card,.paper,.side{background:var(--surface);border:1px solid var(--line);border-radius:15px;box-shadow:var(--shadow)}.platform-card{padding:25px 12px;display:flex;align-items:center;flex-direction:column;gap:9px;transition:transform .2s}.platform-card:hover,.guide-card:hover{transform:translateY(-3px)}.platform-icon{width:62px;height:62px;border-radius:16px;color:white;display:grid;place-items:center;font-size:32px;font-weight:800}.platform-card small{color:var(--muted)}.guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:18px 0 40px}.guide-card{padding:23px;min-height:160px;transition:transform .2s}.guide-card h3{font-size:18px;line-height:1.35}.tag{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--blue);font-weight:800}.arrow{color:var(--blue);font-size:13px;font-weight:700}.cta{background:#1764eb;color:#fff;border-radius:16px;padding:25px 36px;margin-bottom:55px}.cta h2{margin:0}.cta p{margin:4px 0 0}.crumb{font-size:13px;color:var(--muted);margin:30px 0}.crumb a{color:var(--blue)}.category-head{display:flex;align-items:center;gap:18px;margin-bottom:25px}.category-head h1{margin:0;font-size:36px}.category-head p{color:var(--muted);margin:3px 0}.article-grid{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:24px;align-items:start}.paper{padding:40px}.paper h1{font-size:38px;line-height:1.2;margin:12px 0}.lead{font-size:17px;color:var(--muted)}.pill{background:var(--accent);color:white;padding:5px 12px;border-radius:6px;font-size:12px;font-weight:700}.notice{padding:18px;background:#fff7df;border:1px solid #eacb7d;border-radius:10px;color:#614a0a;margin:24px 0}.paper h2{margin-top:35px}.step{display:grid;grid-template-columns:38px 1fr;gap:16px;border-top:1px solid var(--line);padding:25px 0}.num{width:34px;height:34px;border-radius:50%;background:var(--blue);color:white;display:grid;place-items:center;font-weight:800}.step h3{margin:0}.shot{margin-top:15px;min-height:170px;background:var(--bg);border:2px dashed var(--line);border-radius:12px;display:grid;place-items:center;color:var(--muted);text-align:center;padding:16px}.side{padding:22px;position:sticky;top:94px}.side h3{margin-top:0}.side a{display:block;border-top:1px solid var(--line);padding:13px 0;font-size:14px}details{border-top:1px solid var(--line);padding:15px 0}summary{cursor:pointer;font-weight:650}footer{background:var(--surface);border-top:1px solid var(--line);margin-top:60px;padding:28px 0;color:var(--muted)}.foot{display:flex;justify-content:space-between;gap:15px}.foot b{color:var(--blue)}.foot a{margin:0 10px}.fine{font-size:12px;padding-top:16px}body.dark{--bg:#101827;--surface:#182337;--text:#eff4ff;--muted:#abb7c8;--line:#34435c;--shadow:none}body.dark .notice{background:#473d20;color:#ffe6a4;border-color:#8b7134}@media(max-width:850px){nav{gap:10px;flex-wrap:wrap}nav a{font-size:12px}.platform-grid{grid-template-columns:repeat(3,1fr)}.guide-grid{grid-template-columns:repeat(2,1fr)}.article-grid{grid-template-columns:1fr}.side{position:static}}@media(max-width:580px){.nav{flex-wrap:wrap;padding-top:12px;padding-bottom:12px}.logo{font-size:21px}nav{order:3;width:100%;overflow-x:auto;flex-wrap:nowrap;white-space:nowrap;padding-bottom:4px}.hero-inner{padding:45px 22px}.hero h1{font-size:35px}.platform-grid{grid-template-columns:repeat(2,1fr)}.guide-grid{grid-template-columns:1fr}.paper{padding:22px}.paper h1{font-size:29px}.category-head h1{font-size:26px}.heading{display:block}.foot{display:block}}
/* V3 device-specific guides */
.guide-tabs{display:flex;gap:10px;margin:24px 0 18px;flex-wrap:wrap}.device-tab{padding:12px 22px;border:1px solid #cbd5e1;background:#f8fafc;border-radius:12px;font:inherit;font-weight:700;cursor:pointer;color:#102449}.device-tab.active{background:#175eea;color:white;border-color:#175eea}.device-content[hidden]{display:none!important}.official-link{display:inline-block;padding:12px 18px;border-radius:10px;background:#e8f0ff;color:#104ab7;font-weight:700;text-decoration:none}.source-note{font-size:.9rem;opacity:.85}.dark .device-tab:not(.active){background:#1c2b47;color:#e9f0ff;border-color:#445471}.dark .official-link{background:#1c355d;color:#b5d1ff}

.guide-figure{margin:14px 0 0}.guide-figure img{display:block;max-width:100%;height:auto;border:1px solid #dce3ee;border-radius:10px}.guide-figure figcaption{font-size:12px;color:#64748b;margin-top:8px}

/* V6: readable responsive illustrations and accessible image zoom */
.step>div:last-child{min-width:0}.guide-figure{max-width:100%;}.image-zoom{display:block;width:100%;max-width:100%;padding:0;border:0;background:transparent;text-align:left;cursor:zoom-in}.guide-figure img{width:auto;max-width:100%;height:auto;max-height:750px;object-fit:contain;object-position:left top}.image-zoom:focus-visible{outline:3px solid var(--blue);outline-offset:3px}.guide-figure figcaption{font-size:12px;line-height:1.5}.image-lightbox{position:fixed;inset:0;border:0;border-radius:14px;padding:55px 18px 18px;max-width:min(96vw,1500px);max-height:95vh;width:max-content;background:var(--surface);color:var(--text);box-shadow:0 18px 90px #0006}.image-lightbox::backdrop{background:rgba(0,0,0,.82)}.image-lightbox img{display:block;max-width:calc(96vw - 36px);max-height:calc(95vh - 90px);width:auto;height:auto;object-fit:contain}.lightbox-close{position:absolute;top:10px;right:12px;font-weight:700;padding:7px 13px}.dark .image-lightbox{background:#182337}@media(max-width:580px){.step{grid-template-columns:30px minmax(0,1fr);gap:10px}.num{width:28px;height:28px}.guide-figure img{max-height:none}}