:root{--bg:#fafaf9;--surface:#fff;--text:#1c1917;--muted:#57534e;--border:#e7e5e4;--accent:#9f1d1d;--accent-hover:#7f1515;--soft:#f5f5f4;--warn-bg:#fff7ed;--warn-border:#fdba74;--radius:12px}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Noto Sans CJK SC",sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
.container{max-width:1040px;margin:0 auto;padding:0 20px}
section.container{margin-top:56px}
h1{font-size:clamp(1.8rem,4vw,2.6rem);line-height:1.2;margin:0 0 16px}
h2{font-size:1.5rem;margin:0 0 16px}
h3{font-size:1.1rem;margin:0 0 8px}
a{color:var(--accent)}
.skip-link{position:absolute;left:-999px;top:0;background:#000;color:#fff;padding:8px 12px;z-index:10}
.skip-link:focus{left:8px}
.visually-hidden{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.banner{background:var(--warn-bg);border-bottom:1px solid var(--warn-border)}
.banner-inner{max-width:1040px;margin:0 auto;padding:10px 20px;display:flex;gap:12px;align-items:flex-start;justify-content:space-between}
.banner p{margin:0;font-size:.95rem}
.banner-close{background:none;border:0;font-size:1.5rem;line-height:1;cursor:pointer;color:var(--muted);padding:0 4px}
.hero{padding:48px 0 8px}
.lead{font-size:1.1rem;color:var(--muted);max-width:780px;margin:0}
.tools{margin-top:32px!important}
.cards{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:0 1px 2px rgba(0,0,0,.04)}
.card-sub{color:var(--muted);margin:0 0 16px}
label{display:block;font-weight:600;margin:12px 0 6px}
input,select{width:100%;padding:10px 12px;font:inherit;border:1px solid #d6d3d1;border-radius:8px;background:#fff;color:var(--text)}
input:focus,select:focus,button:focus-visible,summary:focus-visible,pre:focus-visible,.table-wrap:focus-visible{outline:3px solid #fca5a5;outline-offset:2px}
input[aria-invalid="true"]{border-color:var(--accent)}
.hint{font-size:.88rem;color:var(--muted);margin:6px 0 0}
.error{font-size:.9rem;color:var(--accent);margin:6px 0 0;min-height:1em}
.btn{display:inline-block;font:inherit;font-weight:600;border-radius:8px;padding:11px 18px;cursor:pointer;border:1px solid transparent;margin-top:16px}
.btn-primary{background:var(--accent);color:#fff;width:100%}
.btn-primary:hover{background:var(--accent-hover)}
.btn-primary:disabled{opacity:.6;cursor:wait}
.btn-secondary{background:var(--soft);border-color:var(--border);color:var(--text)}
.progress-wrap{margin-top:16px}
.progress{height:10px;background:var(--soft);border-radius:999px;overflow:hidden;border:1px solid var(--border)}
.progress-bar{height:100%;width:0;background:var(--accent);transition:width .2s linear}
.demo-output{margin-top:16px;border-top:1px dashed var(--border);padding-top:12px}
.demo-label{display:inline-block;background:#fef3c7;color:#78350f;font-weight:700;font-size:.82rem;padding:2px 8px;border-radius:6px;margin:0}
.demo-label.inline{margin-right:6px}
pre{background:var(--soft);border:1px solid var(--border);border-radius:8px;padding:12px;max-height:260px;overflow:auto;font-size:.8rem;white-space:pre;margin:10px 0 0}
.badge{display:inline-block;background:var(--soft);border:1px solid var(--border);font-size:.82rem;font-weight:600;padding:2px 10px;border-radius:999px;margin:0 0 8px}
.steps-list{padding-left:20px}
.steps-list li{margin-bottom:8px}
.privacy{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px!important;margin-top:24px!important}
.callout{font-size:1.25rem;font-weight:700;background:#fef2f2;border-left:4px solid var(--accent);padding:12px 16px;border-radius:8px;margin:0 0 16px}
.privacy-list{padding-left:20px;margin:0}
.privacy-list li{margin-bottom:6px}
.table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface)}
table{border-collapse:collapse;width:100%;font-size:.92rem}
th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--border);vertical-align:top}
th{background:var(--soft);white-space:nowrap}
tbody tr:last-child td{border-bottom:0}
.how{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(3,1fr);gap:20px;counter-reset:step}
.how li{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;counter-increment:step}
.how li::before{content:counter(step);display:inline-flex;width:30px;height:30px;align-items:center;justify-content:center;border-radius:50%;background:var(--accent);color:#fff;font-weight:700;margin-bottom:10px}
.how p{margin:0;color:var(--muted)}
.after-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.after-grid p{color:var(--muted);margin:0}
.faq details{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:12px 16px;margin-bottom:10px}
.faq summary{cursor:pointer;font-weight:600}
.faq details p{margin:10px 0 0;color:var(--muted)}
.site-footer{margin-top:64px;border-top:1px solid var(--border);padding:24px 0;font-size:.9rem;color:var(--muted)}
.site-footer p{margin:4px 0}
@media (max-width:760px){.cards,.how,.after-grid{grid-template-columns:1fr}.hero{padding-top:32px}}
@media (prefers-reduced-motion:reduce){.progress-bar{transition:none}html{scroll-behavior:auto}}

#retry-btn{margin-top:10px;width:auto}
.btn-primary:disabled{opacity:.6;cursor:wait}

.related-intro{color:var(--muted);margin:0 0 10px;max-width:820px}
.related-disclaimer{margin:0 0 20px}
.tool-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.tool-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;display:flex;flex-direction:column;gap:10px;box-shadow:0 1px 2px rgba(0,0,0,.04)}
.tool-card-top{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px}
.tool-card h3{margin:0;font-size:1.05rem}
.tool-card p{margin:0;color:var(--muted);font-size:.95rem;flex:1}
.tool-card code{font-size:.88em;background:var(--soft);padding:1px 5px;border-radius:4px}
.tool-platform{display:inline-block;background:var(--soft);border:1px solid var(--border);font-size:.78rem;font-weight:600;padding:2px 10px;border-radius:999px;color:var(--text);white-space:nowrap}
.tool-link{display:inline-block;font-weight:600;font-size:.92rem;margin-top:4px;text-decoration:none}
.tool-link:hover{text-decoration:underline}
@media (max-width:760px){.tool-grid{grid-template-columns:1fr}}