:root{--ink:#333333;--muted:#6b7280;--line:#e7e7e7;--bg:#fff;--soft:#f7f7f7;--radius:16px;--max:1080px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:#fff;line-height:1.6}
a{color:inherit;text-decoration:none}.container{width:min(var(--max),calc(100% - 32px));margin:auto}
header{border-bottom:1px solid var(--line);background:#fff;position:sticky;top:0;z-index:10}.nav{height:68px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.logo{font-size:19px;font-weight:800;letter-spacing:-.3px}.logo span{font-weight:500;color:var(--muted)}
.navlinks{display:flex;gap:22px;align-items:center;font-size:14px}.navlinks a{color:#555}.navlinks a:hover,.navlinks a.active{color:#111}
.menu{display:none;border:1px solid var(--line);background:#fff;border-radius:10px;padding:8px 10px}
.hero{padding:64px 0 34px;text-align:center}.hero h1{font-size:clamp(30px,5vw,48px);line-height:1.1;letter-spacing:-1.4px;margin:0 auto 14px;max-width:760px}.hero p{margin:0 auto;color:var(--muted);max-width:650px;font-size:16px}
.tool-wrap{max-width:800px;margin:28px auto 70px}.card{border:1px solid var(--line);border-radius:var(--radius);background:#fff;box-shadow:0 8px 30px rgba(0,0,0,.04)}.tool-card{padding:24px}
.row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:16px}label{display:block;font-size:13px;font-weight:700;margin-bottom:7px}
select{height:46px;border:1px solid #d8d8d8;border-radius:10px;background:#fff;padding:0 12px;color:var(--ink);width:100%;font:inherit}
.upload{border:1.5px dashed #cfcfcf;border-radius:14px;padding:34px 18px;text-align:center;background:#fafafa;cursor:pointer;transition:.2s}.upload:hover,.upload.drag{border-color:#333;background:#f5f5f5}
.upload strong{display:block;font-size:17px;margin-bottom:4px}.upload span{font-size:13px;color:var(--muted)}#fileInput{display:none}
.preview{display:none;margin-top:20px;padding:16px;border:1px solid var(--line);border-radius:14px;grid-template-columns:1fr 1fr;gap:18px}
.preview-box{background:#fafafa;border-radius:12px;padding:14px;text-align:center;min-width:0}.preview-box img{display:block;max-width:100%;max-height:300px;width:auto;height:auto;object-fit:contain;margin:12px auto 0;border-radius:8px}
.meta{font-size:12px;color:var(--muted);margin-top:8px;word-break:break-word}.actions{display:flex;gap:10px;margin-top:18px}
button,.btn{border:0;border-radius:10px;padding:12px 18px;font:inherit;font-weight:700;cursor:pointer}.primary{background:var(--ink);color:#fff}.primary:hover{background:#222}.secondary{background:#f1f1f1;color:var(--ink)}
button:disabled{opacity:.45;cursor:not-allowed}.status{font-size:13px;color:var(--muted);margin-top:10px;min-height:20px}
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:0 auto 70px}.feature{padding:20px;border:1px solid var(--line);border-radius:14px}.feature h3{font-size:15px;margin:0 0 6px}.feature p{font-size:13px;color:var(--muted);margin:0}
.page{padding:58px 0 80px;max-width:820px;margin:auto}.page h1{font-size:38px;letter-spacing:-1px;margin:0 0 12px}.page h2{font-size:21px;margin-top:34px}.page p,.page li{color:#555}.page ul{padding-left:22px}
.notice{background:var(--soft);border:1px solid var(--line);border-radius:14px;padding:16px 18px;margin:22px 0}.small{font-size:12px;color:var(--muted)}
footer{border-top:1px solid var(--line);padding:28px 0;color:var(--muted);font-size:13px}.footer-inner{display:flex;justify-content:space-between;gap:20px;align-items:center}.footer-links{display:flex;gap:16px}
.download{width:100%;margin-top:14px}.result-label{font-weight:700}
@media(max-width:700px){.nav{height:62px}.menu{display:block}.navlinks{display:none;position:absolute;left:16px;right:16px;top:70px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px;flex-direction:column;align-items:flex-start;box-shadow:0 10px 30px rgba(0,0,0,.08)}.navlinks.open{display:flex}.hero{padding:45px 0 25px}.tool-card{padding:16px}.row,.preview,.features{grid-template-columns:1fr}.actions{flex-direction:column}.footer-inner{flex-direction:column;align-items:flex-start}}