:root{--bg:#f6f8fb;--card:#fff;--text:#172033;--muted:#667085;--brand:#2563eb;--brand2:#1d4ed8;--border:#e4e7ec;--success:#067647;--danger:#b42318}
*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
a{color:inherit;text-decoration:none}.container{width:min(1120px,92%);margin:auto}
header{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:20}.nav{height:68px;display:flex;align-items:center;justify-content:space-between;gap:20px}.logo{font-weight:800;font-size:23px;letter-spacing:-.5px}.logo span{color:var(--brand)}nav{display:flex;gap:18px;align-items:center;flex-wrap:wrap}nav a{color:#475467;font-size:14px}nav a:hover{color:var(--brand)}
.hero{padding:70px 0 42px;text-align:center}.hero h1{font-size:clamp(34px,6vw,58px);line-height:1.05;margin:0 0 16px;letter-spacing:-2px}.hero p{max-width:720px;margin:0 auto;color:var(--muted);font-size:18px}
.badge{display:inline-block;background:#eaf1ff;color:var(--brand2);padding:6px 11px;border-radius:999px;font-size:13px;font-weight:700;margin-bottom:16px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;padding:20px 0 55px}.card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:22px;box-shadow:0 2px 8px #10182808}.card h2,.card h3{margin:0 0 8px}.card p{color:var(--muted);margin:0 0 16px;font-size:14px}.btn{display:inline-flex;align-items:center;justify-content:center;border:0;border-radius:10px;background:var(--brand);color:#fff;padding:11px 16px;font-weight:700;cursor:pointer}.btn:hover{background:var(--brand2)}.btn.secondary{background:#eef2f6;color:#344054}.btn.danger{background:#b42318}.btn:disabled{opacity:.5;cursor:not-allowed}
.tool-wrap{max-width:900px;margin:42px auto 70px}.tool-head{text-align:center;margin-bottom:25px}.tool-head h1{font-size:38px;line-height:1.15;margin:0 0 10px}.tool-head p{color:var(--muted)}
.toolbox{background:#fff;border:1px solid var(--border);border-radius:18px;padding:25px;box-shadow:0 5px 20px #1018280a}.drop{border:2px dashed #b8c2d1;border-radius:14px;padding:34px;text-align:center;background:#fafcff}.drop.drag{border-color:var(--brand);background:#f2f7ff}.drop input{display:none}.drop label{cursor:pointer}.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.status{margin-top:16px;color:var(--muted);font-size:14px;min-height:24px}.success{color:var(--success)}.error{color:var(--danger)}
.info{margin-top:28px;background:#fff;border:1px solid var(--border);border-radius:16px;padding:24px}.info h2{margin-top:0}.info h3{margin-top:24px}.faq details{border-top:1px solid var(--border);padding:14px 0}.faq summary{cursor:pointer;font-weight:700}
.video-section{margin-top:24px}.video-wrap{margin-top:14px;border-radius:14px;overflow:hidden;background:#0b0f19;box-shadow:0 5px 20px #1018280a;border:1px solid var(--border)}.video-wrap video{display:block;width:100%;height:auto;max-height:520px;background:#0b0f19}
.preview{display:grid;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:12px;margin-top:18px}.thumb{border:1px solid var(--border);border-radius:10px;padding:8px;background:#fff}.thumb canvas,.thumb img{width:100%;height:130px;object-fit:contain;background:#f5f5f5}.thumb small{display:block;margin-top:5px;color:var(--muted);text-align:center}
.row{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.field label{display:block;font-size:13px;font-weight:700;margin-bottom:6px}.field input,.field select,.field textarea{width:100%;padding:11px;border:1px solid #d0d5dd;border-radius:9px;font:inherit}.field textarea{min-height:110px}
footer{border-top:1px solid var(--border);background:#fff;padding:35px 0;color:var(--muted);font-size:14px}footer .foot{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}footer a{margin-right:14px}
.notice{padding:12px 14px;border-radius:10px;background:#f2f4f7;color:#475467;font-size:14px;margin-top:15px}
@media(max-width:800px){.grid{grid-template-columns:repeat(2,1fr)}nav{gap:10px}.row{grid-template-columns:1fr}}
@media(max-width:560px){.grid{grid-template-columns:1fr}.hero{padding-top:48px}.tool-head h1{font-size:30px}.nav{height:auto;padding:14px 0;align-items:flex-start}nav{font-size:12px}.drop{padding:25px 15px}.toolbox{padding:17px}}