:root{--r:#e8402f;--r2:#c92f20;--g:#2f9e44;--g2:#247a35;--bg:#fff9f4;--ink:#2b2220;--mut:#6f625d;--line:#f1ded5;--card:#fff;--rad:16px}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font:16px/1.8 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg)}
a{color:var(--r2);text-decoration:none}a:hover{text-decoration:underline}
img{max-width:100%}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,249,244,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:19px;color:var(--ink)}.brand:hover{text-decoration:none}
.main-nav{display:flex;gap:6px}
.main-nav a{padding:6px 14px;border-radius:99px;color:var(--ink);font-size:15px}
.main-nav a:hover{background:#ffe9e1;text-decoration:none}
.main-nav a.on{background:var(--r);color:#fff}
.menu-btn{display:none;background:none;border:0;width:40px;height:40px;cursor:pointer;flex-direction:column;justify-content:center;gap:5px;align-items:center}
.menu-btn i{display:block;width:22px;height:2px;background:var(--ink);border-radius:2px}
.hero{padding:44px 0 36px;text-align:center;background:radial-gradient(900px 300px at 50% -80px,#ffd9cd,transparent),linear-gradient(#fff9f4,#fff9f4)}
.hero h1,.page-head h1{margin:0 0 12px;font-size:clamp(26px,4.4vw,40px);line-height:1.3;letter-spacing:.5px}
.hero>.wrap>p{max-width:680px;margin:0 auto 26px;color:var(--mut)}
.tool{max-width:820px;margin:0 auto;background:var(--card);border:1px solid var(--line);border-radius:22px;padding:18px;box-shadow:0 18px 50px -24px rgba(232,64,47,.45)}
.stage{position:relative;min-height:260px;border:2px dashed #f2b7a9;border-radius:var(--rad);background:#fffaf7;display:flex;align-items:center;justify-content:center;overflow:hidden;cursor:pointer;transition:.2s}
.stage:hover,.stage.drag{border-color:var(--g);background:#f3fbf4}
.stage img{max-width:100%;max-height:70vh;display:block}
.empty{display:flex;flex-direction:column;align-items:center;gap:6px;color:var(--mut);padding:30px 12px}.empty b{color:var(--ink)}.empty span{font-size:14px}
.busy{position:absolute;inset:0;background:rgba(255,255,255,.75);display:flex;align-items:center;justify-content:center}
.busy[hidden],[hidden]{display:none!important}
.busy div{display:flex;align-items:center;gap:10px;background:#fff;border:1px solid var(--line);padding:10px 18px;border-radius:99px;box-shadow:0 6px 20px rgba(0,0,0,.08)}
.busy i{width:18px;height:18px;border:3px solid #ffd2c8;border-top-color:var(--r);border-radius:50%;animation:sp .7s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}
.status{margin:12px 0;font-size:14px;color:var(--mut)}
.ctrls{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;align-items:center}
.btn{display:inline-block;padding:10px 22px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink);font:inherit;font-size:15px;cursor:pointer;transition:.15s}
.btn:hover{text-decoration:none;transform:translateY(-1px);box-shadow:0 6px 14px -6px rgba(0,0,0,.25)}
.btn.pri{background:var(--r);border-color:var(--r);color:#fff}.btn.pri:hover{background:var(--r2)}
.btn.grn{background:var(--g);border-color:var(--g);color:#fff}.btn.grn:hover{background:var(--g2)}
.btn.pick{background:#fff3ee;border-color:#f6c3b6;color:var(--r2)}
.btn.ghost{background:#fff}
.btn:disabled{opacity:.4;cursor:not-allowed;transform:none;box-shadow:none}
.fmt{font-size:14px;color:var(--mut);display:flex;align-items:center;gap:6px}
.fmt select{padding:8px 10px;border-radius:10px;border:1px solid var(--line);background:#fff;font:inherit;font-size:14px}
.hint{margin:14px 0 0;font-size:13px;color:var(--mut)}
.band{padding:56px 0;background:#fff;border-block:1px solid var(--line)}.band.alt{background:linear-gradient(135deg,#fff3ee,#f1fbf3)}
.block{padding:56px 20px}
.sec-t{font-size:clamp(22px,3vw,28px);margin:0 0 28px;text-align:center;position:relative}
.sec-t:after{content:"";display:block;width:44px;height:4px;border-radius:4px;margin:10px auto 0;background:linear-gradient(90deg,var(--r) 50%,var(--g) 50%)}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--rad);padding:22px;color:var(--ink)}
.card h3{margin:10px 0 6px;font-size:18px}.card p{margin:0;color:var(--mut);font-size:15px;line-height:1.75}
.card.link{transition:.2s}.card.link:hover{text-decoration:none;border-color:var(--g);transform:translateY(-3px);box-shadow:0 14px 28px -16px rgba(47,158,68,.5)}
.ic{display:inline-flex;width:42px;height:42px;border-radius:12px;align-items:center;justify-content:center;font-style:normal;font-weight:700;color:#fff}.ic.r{background:var(--r)}.ic.g{background:var(--g)}
.steps{list-style:none;padding:0;margin:0;display:grid;gap:16px}
.steps li{display:flex;gap:16px;background:#fff;border:1px solid var(--line);border-radius:var(--rad);padding:20px}
.steps b{flex:none;width:38px;height:38px;border-radius:50%;background:var(--g);color:#fff;display:flex;align-items:center;justify-content:center}
.steps h3{margin:0 0 4px}.steps p{margin:0;color:var(--mut)}
.two{display:grid;grid-template-columns:1.4fr 1fr;gap:36px;align-items:center}.two p{margin:0 0 14px}
.viz{background:#fff;border:1px solid var(--line);border-radius:var(--rad);padding:20px}
.table-wrap{overflow-x:auto;background:#fff;border:1px solid var(--line);border-radius:var(--rad)}
table{width:100%;border-collapse:collapse;font-size:15px}th,td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--line)}
th{background:#fff3ee;color:var(--r2)}tr:last-child td{border-bottom:0}
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;margin-bottom:12px;padding:0 18px}
.faq summary{cursor:pointer;padding:14px 0;font-weight:600;list-style:none}
.faq summary:before{content:"+";display:inline-block;width:22px;color:var(--r);font-weight:700}
.faq details[open] summary:before{content:"−";color:var(--g)}
.faq p{margin:0 0 14px;color:var(--mut)}
.more{text-align:center}
.page-head{padding:44px 0 28px;text-align:center;background:linear-gradient(135deg,#ffe8e0,#e8f7ec)}.page-head p{margin:0;color:var(--mut)}
.crumb{max-width:1080px;margin:0 auto;padding:14px 20px 0;font-size:14px;color:var(--mut);display:flex;gap:8px}
.prose{padding-top:32px;padding-bottom:56px;max-width:860px}
.prose section{margin-bottom:30px}.prose h2{font-size:24px;padding-left:12px;border-left:5px solid var(--r);margin:0 0 12px}
.prose li{margin-bottom:6px}
.cta{text-align:center;background:linear-gradient(135deg,var(--r),#f2703c);color:#fff;border-radius:20px;padding:34px 20px;margin-top:20px}
.cta h2{border:0;padding:0;margin:0 0 6px;color:#fff}.cta p{margin:0 0 16px;opacity:.9}.cta .btn{background:#fff;color:var(--r2);border-color:#fff}
.site-footer{background:#2b2220;color:#d8c9c3;padding:40px 0 18px;margin-top:20px}
.foot{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:24px}
.foot strong{color:#fff;font-size:18px}.foot p{font-size:14px;margin:6px 0}.foot b{color:#fff;display:block;margin-bottom:6px}
.foot a{display:block;color:#d8c9c3;font-size:14px;line-height:2}.foot a:hover{color:#8fe3a2}
.copy{margin-top:22px;padding-top:16px;border-top:1px solid #4a3b36;font-size:13px;color:#a8958e}
.to-top{position:fixed;right:18px;bottom:22px;width:44px;height:44px;border-radius:50%;border:0;background:var(--g);color:#fff;font-size:20px;cursor:pointer;box-shadow:0 8px 20px rgba(0,0,0,.2)}
@media(max-width:860px){.grid4{grid-template-columns:repeat(2,1fr)}.grid3{grid-template-columns:1fr}.two{grid-template-columns:1fr}.foot{grid-template-columns:1fr}}
@media(max-width:700px){.menu-btn{display:flex}.main-nav{display:none;position:absolute;top:64px;left:0;right:0;flex-direction:column;background:#fff9f4;padding:10px 20px 16px;border-bottom:1px solid var(--line)}.main-nav.open{display:flex}.main-nav a{padding:10px 14px}.grid4{grid-template-columns:1fr}.block,.band{padding:40px 20px}.band{padding-inline:0}.btn{padding:10px 16px}}