:root{--ink:#1d2433;--muted:#5d6678;--line:#e3e6ee;--brand:#2357e8;--brand2:#e9efff;--warn:#fff4d6;--warnline:#e6b93a;--bg:#fafbfd}
*{box-sizing:border-box}body{margin:0;font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg)}
a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}
.wrap{max-width:1040px;margin:0 auto;padding:0 20px}
.top{background:#fff;border-bottom:1px solid var(--line)}.nav{display:flex;align-items:center;justify-content:space-between;height:60px}
.brand{font-weight:800;font-size:20px;color:var(--ink)}.nav nav a{margin-left:18px;color:var(--ink)}.nav nav a.lang{border:1px solid var(--line);padding:3px 10px;border-radius:999px}
.hero{background:linear-gradient(180deg,#fff,var(--brand2));padding:56px 0 44px;border-bottom:1px solid var(--line)}
h1{font-size:34px;line-height:1.25;margin:18px 0 12px}.hero h1{max-width:820px;font-size:38px}h2{font-size:24px;margin:38px 0 14px}h3{margin:0 0 6px;font-size:18px}
.lead{font-size:18px;color:var(--muted);max-width:760px}.muted{color:var(--muted);font-size:14px}
.btn{display:inline-block;background:var(--brand);color:#fff;border:1px solid var(--brand);padding:10px 20px;border-radius:10px;font-weight:600;font-size:16px;cursor:pointer;font-family:inherit;line-height:1.4}
.btn:hover{text-decoration:none;filter:brightness(1.05)}.btn.ghost{background:#fff;color:var(--brand)}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.two{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px}
.steps{padding-left:22px}.steps li{margin:10px 0}.checks{list-style:none;padding:0}.checks li{padding-left:24px;position:relative;margin:6px 0}.checks li:before{content:"✓";position:absolute;left:0;color:#1a9b5a;font-weight:700}
.sample{background:#fff;border:1px dashed var(--warnline);border-radius:14px;padding:16px;position:relative}.sample h4{margin:12px 0 4px}
.tag-demo{display:inline-block;background:var(--warn);border:1px solid var(--warnline);color:#7a5a00;font-weight:700;font-size:12px;padding:2px 8px;border-radius:6px;letter-spacing:.04em}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:14px;white-space:pre-wrap;word-break:break-word;background:#f4f6fa;border-radius:8px;padding:8px 10px;margin:0}
.big{font-size:20px}details{background:#fff;border:1px solid var(--line);border-radius:10px;padding:10px 14px;margin:8px 0}summary{cursor:pointer;font-weight:600}
.center{text-align:center;margin:36px auto}
.plan{display:flex;flex-direction:column}.plan .btn{margin-top:auto;width:100%;text-align:center}.plan form{margin-top:auto}.plan form .btn{width:100%}.plan.featured{border:2px solid var(--brand)}
.price{font-size:34px;font-weight:800;margin:6px 0}.price span{font-size:15px;color:var(--muted);font-weight:500}
.notice{background:var(--brand2);border:1px solid #c7d5ff;padding:10px 14px;border-radius:10px;margin:16px 0}.notice.warn{background:var(--warn);border-color:var(--warnline);color:#5c4300;font-weight:600}
.form label{display:block;margin:10px 0;font-weight:600;font-size:14px}.form input[type=text],.form input:not([type]),.form textarea,.form input[name]{width:100%;padding:9px 10px;border:1px solid var(--line);border-radius:8px;font:inherit;font-weight:400;margin-top:4px}
.form input[type=checkbox]{width:auto;margin:0 4px 0 0}.form input[type=file]{border:none;padding:6px 0}
.row{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px}fieldset{border:1px solid var(--line);border-radius:10px;margin:10px 0}legend{font-weight:600;font-size:14px}
label.inline{display:inline-block!important;margin:4px 14px 4px 0!important;font-weight:500!important}
.result{margin-top:20px}.plat{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px;margin:14px 0}.plat h3{display:flex;justify-content:space-between;align-items:center}
.copy{font-size:13px;padding:4px 10px;border-radius:8px;border:1px solid var(--line);background:#fff;cursor:pointer}
.kv th{text-align:left;padding:6px 18px 6px 0;color:var(--muted)}.prose{max-width:800px}.prose h2{font-size:19px;margin:26px 0 6px}
.foot{border-top:1px solid var(--line);margin-top:60px;padding:24px 0;background:#fff;font-size:14px}.foot .wrap>div{margin:4px 0}
@media(max-width:760px){.grid3,.two{grid-template-columns:1fr}.hero h1{font-size:28px}.nav nav a{margin-left:10px;font-size:14px}}

main{min-height:calc(100vh - 200px)}
.hp{position:absolute;left:-10000px;width:1px;height:1px;overflow:hidden}

/* Mobile / touch: tap targets >= 44px, big file button, larger checkboxes, balanced headings */
h1,h2,.lead{text-wrap:balance}
.nav nav a{display:inline-flex;align-items:center;min-height:44px;padding:0 6px}.nav nav a.lang{min-height:36px;margin-top:4px;margin-bottom:4px}
.foot a{display:inline-flex;align-items:center;min-height:44px;padding:0 6px}
summary{min-height:44px;display:flex;align-items:center;padding:4px 0}details{padding:4px 14px}
.muted a{display:inline-block;padding:10px 0}
.form input[type=file]{width:100%;padding:0;border:2px dashed var(--line);border-radius:12px;background:#fff;font-size:15px;margin-top:6px}
.form input[type=file]::file-selector-button{display:block;width:100%;min-height:56px;margin:0 0 6px;border:0;border-radius:10px 10px 0 0;background:var(--brand);color:#fff;font:600 17px/1.2 inherit;font-family:inherit;cursor:pointer}
.form input[type=checkbox]{width:22px;height:22px;margin:0 8px 0 0;vertical-align:middle;accent-color:var(--brand)}
label.inline{min-height:44px;display:inline-flex!important;align-items:center;padding:0 4px}
.copy{min-height:36px;padding:6px 12px}
.test-mode-inline{margin:8px 0 0;font-size:13px;font-weight:700;color:#7a5a00;background:var(--warn);border:1px solid var(--warnline);border-radius:8px;padding:4px 8px;text-align:center}
.plan .btn{min-height:44px}
@media(max-width:760px){.nav{height:auto;flex-wrap:wrap;padding:6px 20px}.nav nav a{margin-left:4px}.foot a{padding:0 8px}}
html[lang=zh-CN] h1{word-break:keep-all;overflow-wrap:anywhere}