:root{color-scheme:light;--ink:#181818;--muted:#565656;--paper:#fff;--canvas:#f1f1f1;--frame:#343434}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:20px}
body{margin:0;background:var(--canvas);color:var(--ink);font-family:Inter,"PingFang SC","Microsoft YaHei",Arial,sans-serif;font-size:16px;line-height:1.7}
a{color:inherit;text-underline-offset:4px}
a:focus-visible,summary:focus-visible{outline:3px solid #181818;outline-offset:5px}
img{max-width:100%;height:auto}
.guide-shell{max-width:1160px;margin:0 auto;padding:28px 28px 64px}
.guide-header{display:flex;justify-content:space-between;align-items:center;gap:18px;border-bottom:2px solid var(--frame);padding-bottom:18px}
.back-link{font-size:14px;font-weight:650;text-decoration:none}
.guide-brand{display:flex;align-items:center;gap:10px;font-weight:700}
.guide-brand img{width:36px;height:36px;object-fit:contain}
.guide-intro{padding:30px 0 20px}
.app-marks{display:flex;gap:16px;align-items:center;margin-bottom:10px}
.app-marks img{object-fit:contain;flex-shrink:0}
.app-marks span{color:var(--muted)}
h1{font-size:clamp(28px,4.2vw,44px);letter-spacing:-1px;line-height:1.25;margin:0 0 10px;font-weight:850}
.mobile-break{display:none}
.intro-copy{margin:0 0 20px;color:var(--muted);font-size:18px}
.intro-copy strong{color:var(--ink)}
.compatibility-note{font-size:14px;color:var(--muted);margin:-10px 0 20px}
.account-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:0 0 22px}
.account-option{padding:18px 20px;background:var(--paper);border:2px solid var(--frame);border-radius:10px}
.account-option h2{font-size:20px;letter-spacing:0;margin:0 0 10px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.account-option h2 span{font-size:13px;background:var(--ink);color:#fff;padding:3px 8px;border-radius:4px;font-weight:600}
.account-option p{margin:0;font-size:16px;overflow-wrap:anywhere}
@media(max-width:650px){.account-options{grid-template-columns:1fr;gap:10px}.account-option{padding:16px}.account-option h2{font-size:19px}}
.route-strip{display:flex;flex-wrap:wrap;gap:10px 20px;font-weight:700;align-items:center}
.step{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.35fr);align-items:center;gap:30px;border:3px solid var(--frame);border-radius:16px;padding:30px;margin-top:20px;background:var(--paper);overflow:hidden}
.step-copy{min-width:0}
.step-number{display:inline-grid;place-items:center;min-width:45px;height:36px;background:var(--ink);color:white;font-size:20px;font-weight:800;padding:0 10px;border-radius:5px}
h2{font-size:26px;line-height:1.35;margin:14px 0 12px;letter-spacing:-.5px}
.step-copy>p{margin:10px 0}
.step-copy p{overflow-wrap:anywhere}
.primary-link{display:inline-flex;align-items:center;justify-content:center;padding:10px 18px;min-height:46px;margin-top:10px;background:var(--ink);color:#fff;border:2px solid var(--ink);border-radius:7px;text-decoration:none;font-weight:700}
.primary-link:hover{background:#383838}
.small-note{font-size:14px;color:var(--muted)}
.step-copy>.small-note{margin-top:14px}
.step-tip{margin-top:18px;padding:13px 15px;background:#f0f0f0;border-left:3px solid var(--ink);font-size:14px}
.step-tip strong{font-size:15px}
.step-tip p{margin:4px 0 0}
.screenshot{min-width:0;margin:0;text-align:center;align-self:center}
.screenshot a{display:block;border-radius:9px;overflow:hidden;background:#f6f6f6;cursor:zoom-in}
.screenshot img{display:block;width:100%;height:auto;object-fit:contain}
.step>.screenshot:not(.search-picture){width:min(100%,400px);justify-self:center}
.screenshot figcaption{font-size:14px;font-weight:650;margin-top:10px;line-height:1.5}
.screenshot figcaption small{display:block;font-size:12px;font-weight:400;color:var(--muted);margin-top:4px}
.picture-pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;align-items:start;min-width:0}
.search-step{grid-template-columns:minmax(0,1fr) minmax(0,.9fr);gap:40px}
.search-picture{width:min(100%,305px);justify-self:center}
.search-targets{display:grid;gap:12px;margin-top:20px}
.search-target{display:flex;align-items:center;gap:18px;border:2px solid var(--frame);padding:15px 18px;border-radius:9px}
.search-target>img{flex:none;width:52px;height:40px;object-fit:contain}
.search-target p{margin:2px 0 0;font-size:15px}
.search-target small{color:var(--muted);font-size:13px}
@media(min-width:761px) and (max-width:1000px){.step{gap:20px;padding:24px;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr)}.picture-pair{gap:8px}}
@media(max-width:760px){.guide-shell{padding:18px 16px 38px}.guide-header{gap:10px}.guide-brand{font-size:14px;gap:7px}.guide-brand img{width:30px;height:30px}.guide-intro{padding-top:24px}.intro-copy{font-size:16px}.route-strip{font-size:13px;gap:5px 7px}.route-strip span{white-space:nowrap}.step,.search-step{grid-template-columns:minmax(0,1fr);padding:22px 18px;gap:20px;margin-top:16px;border-radius:12px}.step-copy h2{font-size:24px;margin-top:12px}.step-number{min-width:40px;height:32px;font-size:18px}.step>.screenshot:not(.search-picture){max-width:360px}.picture-pair{grid-template-columns:minmax(0,1fr);gap:22px;max-width:360px;justify-self:center;width:100%}.search-picture{width:min(100%,310px)}.step-tip{margin-top:14px}}
@media(max-width:420px){.mobile-break{display:block}.route-strip{gap:5px}.route-strip span[aria-hidden]{display:none}.route-strip span:not([aria-hidden]){border:1px solid #aaa;border-radius:4px;padding:3px 6px}.guide-brand span{display:none}.search-target{padding:13px 12px;gap:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{body{background:white}.guide-header,.primary-link{display:none}.guide-shell{max-width:none;padding:0}.step{break-inside:avoid;border-width:1px}.screenshot img{max-height:400px;width:auto;margin:auto}.picture-pair{grid-template-columns:1fr 1fr}}