:root{color-scheme:light dark;--bg:#fafafa;--surface:#fff;--text:#202124;--muted:#6b6d72;--faint:#74767c;--border:#e4e5e8;--soft:#f3f4f5;--orange:#c65b06;--orange-soft:#fff3e8;--green:#248449;--red:#bf3e35;--blue:#2563d4;--shadow:0 2px 7px #181a2204;--dialog-shadow:0 24px 90px #0003;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue","PingFang SC","Microsoft YaHei",sans-serif;font-synthesis:none}
*{box-sizing:border-box}body{margin:0;min-width:280px;min-height:100svh;background:var(--bg);color:var(--text);display:grid;grid-template-rows:auto 1fr auto;-webkit-font-smoothing:antialiased}button,input,a{-webkit-tap-highlight-color:transparent}button,input{font:inherit}button{cursor:pointer}button:disabled{cursor:default}button,a{touch-action:manipulation}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid var(--blue);outline-offset:4px}button{color:inherit}button svg{pointer-events:none}[hidden]{display:none!important}svg{display:block;width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}svg path[fill]{stroke:none}.site-header,.site-footer{width:min(1200px,calc(100% - 112px));margin-inline:auto;display:flex;align-items:center;justify-content:space-between}.site-header{padding-block:31px}.brand{display:flex;align-items:center;gap:10px;font-size:18px;letter-spacing:-.5px;font-weight:650}.brand svg{width:29px;height:26px;color:#f48120}.quiet-button{background:none;border:0;color:var(--muted);font-size:14px;min-height:44px;padding:8px}.quiet-button:hover,.text-button:hover{color:var(--text)}.language{display:flex;align-items:center;gap:7px}.language svg{width:17px;height:17px}.language span{min-width:30px}main{display:flex;justify-content:center;align-items:center;padding:64px 24px 100px}.verification{width:100%;max-width:480px;animation:arrive .5s ease both}.shield{display:grid;place-items:center;width:56px;height:56px;border-radius:16px;background:var(--orange-soft);color:var(--orange);margin-bottom:26px}.shield svg{width:29px;height:32px;stroke-width:1.6}h1{font-size:34px;font-weight:650;line-height:1.25;letter-spacing:-1.2px;margin:0 0 14px}html:lang(zh-CN) h1{font-size:30px;letter-spacing:-.4px}.intro{font-size:16px;line-height:1.7;color:var(--muted);margin:0 0 32px;min-height:28px}.widget{position:relative;background:var(--surface);border:1px solid var(--border);border-radius:11px;box-shadow:var(--shadow);overflow:hidden;transition:border-color .25s,background .25s}.widget-body{border:0;background:transparent;width:100%;display:flex;align-items:center;text-align:start;padding:24px 23px;gap:18px;min-height:110px}.widget-body:focus-visible{outline-offset:-5px}.status-icon{position:relative;flex-shrink:0;width:29px;height:29px;display:grid;place-items:center;color:var(--orange)}.spinner{display:block;width:27px;height:27px;border:2.5px solid var(--border);border-top-color:var(--orange);border-right-color:var(--orange);border-radius:50%;animation:spin 1.1s linear infinite}.status-icon>svg{display:none;stroke-width:2.2;width:23px;height:23px}.widget-copy{display:flex;flex-direction:column;gap:7px;flex:1;min-width:0}.widget-copy strong{font-size:16px;font-weight:550;line-height:1.4}.widget-copy>span{font-size:13px;color:var(--muted);line-height:1.4}.widget-brand{display:flex;flex-direction:column;align-items:center;flex-shrink:0;margin-left:6px;user-select:none}.widget-brand svg{width:30px;height:24px;color:#f48120;margin-bottom:1px}.widget-brand>span{font-size:10px;font-weight:750;letter-spacing:1px;color:var(--text)}.widget-brand small{font-size:8px;letter-spacing:1.5px;color:var(--muted);line-height:1.7}.progress-track{height:2px;background:var(--soft)}.progress-track span{display:block;width:8%;height:100%;background:var(--orange);transition:width 1.25s ease,background .3s}.widget[data-state=success] .spinner,.widget[data-state=challenge] .spinner,.widget[data-state=error] .spinner{display:none}.widget[data-state=success] .check,.widget[data-state=challenge] .question,.widget[data-state=error] .error-icon{display:block}.widget[data-state=success] .status-icon{background:var(--green);color:white;border-radius:50%}.widget[data-state=success] .progress-track span{background:var(--green)}.widget[data-state=challenge] .status-icon,.widget[data-state=error] .status-icon{border:1.5px solid currentColor;border-radius:50%}.widget[data-state=error] .status-icon{color:var(--red)}.widget[data-state=error] .progress-track span{background:var(--red)}.steps{list-style:none;padding:0;display:flex;justify-content:space-between;gap:12px;margin:19px 1px 32px;color:var(--faint);font-size:12px}.steps li{display:flex;align-items:center;gap:7px;line-height:1.5}.step-mark{width:5px;height:5px;border-radius:50%;background:var(--border);flex-shrink:0}.steps .active{color:var(--muted)}.steps .active .step-mark{background:var(--orange)}.steps .done .step-mark{background:var(--green)}.destination{border-top:1px solid var(--border);padding-top:23px;display:flex;align-items:center;gap:9px;color:var(--muted);font-size:14px}.destination svg{height:15px;width:15px;color:var(--faint)}.destination>span{letter-spacing:.1px}.destination .destination-arrow{margin-left:auto;width:18px;height:18px}.actions{display:flex;align-items:center;gap:18px;min-height:57px;padding-top:8px}.text-button,.continue-link{padding:8px 0;min-height:44px;display:inline-flex;align-items:center;background:none;border:0;font-size:13px;color:var(--muted);text-decoration:none}.continue-link{color:var(--green)}.site-footer{border-top:1px solid var(--border);padding-block:20px;gap:20px;min-height:86px;color:var(--faint);font-size:12px}.footer-note{display:flex;align-items:center;gap:7px;line-height:1.5}.footer-note svg{height:14px;width:14px;flex-shrink:0}.site-footer nav{display:flex;align-items:center;gap:9px}.site-footer .quiet-button{font-size:12px}.trap{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.noscript{font-size:14px;color:var(--red);line-height:1.7}dialog{color:var(--text);background:var(--surface);border:1px solid var(--border);box-shadow:var(--dialog-shadow);padding:0;max-height:calc(100svh - 32px);overflow:auto}dialog::backdrop{background:#11131866;backdrop-filter:blur(4px)}dialog[open]{animation:arrive .2s ease both}.challenge-dialog{width:396px;max-width:calc(100vw - 28px);border-radius:10px}.challenge-header{display:flex;align-items:flex-start;justify-content:space-between;background:var(--blue);color:#fff;padding:22px 20px 20px;min-height:142px}.challenge-header p{font-size:15px;line-height:1.5;margin:0}.challenge-header h2{font-size:28px;font-weight:650;line-height:1.3;margin:2px 0 5px;letter-spacing:-.3px}.challenge-header .challenge-hint{font-size:13px;color:#ffffffe0}.icon-button{display:grid;place-items:center;flex-shrink:0;width:44px;height:44px;border:0;background:none;color:var(--muted);border-radius:6px}.icon-button:hover{background:var(--soft)}.icon-button svg{width:21px;height:21px}.close-challenge{color:white;margin:-9px -9px 0 4px}.close-challenge:hover{background:#ffffff1a}.image-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:4px;padding:7px}.image-tile{position:relative;aspect-ratio:1;border:0;padding:0;background:var(--soft);overflow:hidden}.tile-image{display:block;position:absolute;inset:0;background-image:url('challenge-atlas.png');background-size:300% 300%;background-repeat:no-repeat;transition:transform .15s ease}.image-tile[aria-pressed=true] .tile-image{transform:scale(.84)}.image-tile[aria-pressed=true]{background:var(--blue)}.image-tile::after{content:'✓';position:absolute;left:6px;top:6px;display:grid;place-items:center;width:24px;height:24px;border-radius:50%;background:var(--blue);color:white;font-size:17px;opacity:0}.image-tile[aria-pressed=true]::after{opacity:1}.image-tile:focus-visible{outline-offset:-3px;z-index:1}.tile-0{background-position:0 0}.tile-1{background-position:50% 0}.tile-2{background-position:100% 0}.tile-3{background-position:0 50%}.tile-4{background-position:50% 50%}.tile-5{background-position:100% 50%}.tile-6{background-position:0 100%}.tile-7{background-position:50% 100%}.tile-8{background-position:100% 100%}.challenge-error{color:var(--red);font-size:13px;line-height:1.45;min-height:19px;margin:3px 14px 7px}.challenge-controls{display:flex;align-items:center;gap:8px;padding:7px 12px 10px;border-top:1px solid var(--border)}.challenge-alternative{font-size:12px;line-height:1.35;flex:1}.verify-selection,.info-done{border:0;background:var(--blue);color:#fff;font-size:14px;font-weight:550;padding:12px 21px;min-height:44px;border-radius:5px;flex-shrink:0}.verify-selection:hover,.info-done:hover{filter:brightness(.95)}.verify-selection:disabled{opacity:.55}.challenge-attribution{text-align:center;font-size:12px;color:var(--faint);padding:0 0 12px}.text-challenge{padding:32px 24px;min-height:180px}.text-challenge label{display:block;font-size:22px;margin-bottom:20px}.text-challenge input{width:100%;background:var(--bg);border:1px solid var(--border);padding:12px;border-radius:6px;font-size:18px;color:var(--text)}.info-dialog{width:430px;max-width:calc(100vw - 32px);padding:24px;border-radius:16px}.info-heading{display:flex;align-items:center;justify-content:space-between;gap:16px}.info-heading h2{font-size:22px;line-height:1.4;margin:0}.info-heading .icon-button{margin:-8px -8px -8px 0}.info-dialog p{font-size:15px;line-height:1.8;color:var(--muted);white-space:pre-line;margin:22px 0}.info-done{width:100%;background:var(--text);color:var(--surface)}
@keyframes spin{to{transform:rotate(360deg)}}@keyframes arrive{from{opacity:0;transform:translateY(7px)}to{opacity:1;transform:translateY(0)}}
@media(prefers-color-scheme:dark){:root{--bg:#111113;--surface:#1c1c1f;--text:#eeeeef;--muted:#a4a4ad;--faint:#90909a;--border:#303034;--soft:#252529;--orange:#f49a55;--orange-soft:#2c211a;--green:#64bb87;--red:#ed8278;--blue:#3978e7;--shadow:none;--dialog-shadow:0 24px 90px #0008}.widget[data-state=success] .status-icon{color:#14251a}.image-tile{background:#27272b}}
@media(max-width:600px){.site-header,.site-footer{width:calc(100% - 44px)}.site-header{padding-block:16px}.brand{font-size:17px}.brand svg{width:27px}main{padding:55px 24px 64px}.shield{width:50px;height:50px;border-radius:14px;margin-bottom:24px}h1{font-size:30px;letter-spacing:-.8px}html:lang(zh-CN) h1{font-size:27px}.intro{margin-bottom:28px;line-height:1.7}.widget-body{padding:22px 18px;gap:14px}.widget-copy strong{font-size:15px}.widget-brand{margin-left:0}.widget-copy>span{font-size:12px}.steps{font-size:12px;gap:8px}.site-footer{padding-block:14px;gap:8px;flex-wrap:wrap;min-height:74px}.footer-note{font-size:12px}.site-footer nav{margin-left:auto}.site-footer .quiet-button{padding-inline:4px}}
@media(max-width:350px){.widget-brand{display:none}.widget-body{padding-inline:17px}.site-header,.site-footer{width:calc(100% - 32px)}main{padding-inline:18px}.steps{font-size:11px}.challenge-header{padding:18px 15px}.challenge-controls{gap:4px;padding-inline:8px}.verify-selection{padding-inline:16px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}.spinner{border-style:dotted}.spinner::after{content:'';display:block}}