:root{
  --indigo:#4f46e5;--violet:#7c3aed;--pink:#ec4899;--ink:#17142b;--muted:#6b7280;
  --bg:#f6f7fd;--card:#fff;--line:#e8eaf6;--green:#16a34a;--radius:18px;
  --grad:linear-gradient(135deg,#4f46e5 0%,#7c3aed 55%,#a855f7 100%);
  --shadow:0 10px 30px rgba(79,70,229,.12);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Segoe UI',system-ui,-apple-system,Roboto,'Helvetica Neue',sans-serif;background:var(--bg);color:var(--ink);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--indigo);text-decoration:none}
/* header */
header.top{background:rgba(255,255,255,.85);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.top-inner{max-width:1180px;margin:0 auto;padding:14px 20px;display:flex;align-items:center;gap:12px}
.logo{font-size:24px;font-weight:900;letter-spacing:-.5px;color:var(--ink)}
.logo span{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.top-inner nav{margin-left:auto;display:flex;gap:20px;font-size:14.5px;font-weight:700}
.top-inner nav a{color:var(--muted);transition:.2s}
.top-inner nav a:hover{color:var(--indigo)}
main{max-width:1180px;margin:0 auto;padding:0 20px}
/* hero */
.hero{text-align:center;padding:80px 20px 60px;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;top:-140px;left:50%;transform:translateX(-50%);width:640px;height:340px;background:radial-gradient(closest-side,rgba(124,58,237,.22),transparent);pointer-events:none}
.hero h1{font-size:clamp(32px,5.5vw,54px);font-weight:900;letter-spacing:-1.5px;line-height:1.12;position:relative}
.hero h1 span{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:var(--muted);font-size:18px;max-width:700px;margin:16px auto 0;position:relative}
.badges{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:24px;position:relative}
.badge{background:#fff;border:1px solid var(--line);color:var(--indigo);font-size:13px;font-weight:800;padding:8px 18px;border-radius:999px;box-shadow:0 4px 12px rgba(79,70,229,.08)}
.badge.hot{background:var(--grad);color:#fff;border:none}
/* tool grid */
.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:18px;padding:14px 0 60px}
.tool-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;display:block;color:var(--ink);position:relative;overflow:hidden;transition:transform .22s,box-shadow .22s,border-color .22s}
.tool-card::after{content:'';position:absolute;top:0;left:0;right:0;height:4px;background:var(--grad);opacity:0;transition:.22s}
.tool-card:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:#c9cdf5}
.tool-card:hover::after{opacity:1}
.tool-card .ico{font-size:32px;width:60px;height:60px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#eef0ff,#f5efff);border-radius:16px}
.tool-card h3{font-size:16.5px;margin:14px 0 6px;letter-spacing:-.2px}
.tool-card p{font-size:13.5px;color:var(--muted);line-height:1.55}
.tool-card .arrow{position:absolute;right:18px;bottom:18px;color:var(--indigo);font-weight:900;opacity:0;transform:translateX(-6px);transition:.22s}
.tool-card:hover .arrow{opacity:1;transform:none}
/* content sections */
section.block{padding:36px 0}
section.block h2{font-size:27px;margin-bottom:14px;letter-spacing:-.5px}
section.block p,section.block li{color:#3b3f52}
section.block ul{margin:10px 0 10px 22px}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px 22px;margin-bottom:10px;transition:.2s}
.faq details:hover{border-color:#c9cdf5}
.faq summary{font-weight:700;cursor:pointer}
/* footer */
footer.site{background:#14121f;color:#a7adc0;margin-top:50px}
.foot-inner{max-width:1180px;margin:0 auto;padding:44px 20px;display:flex;gap:32px;flex-wrap:wrap;justify-content:space-between}
.foot-inner h4{color:#fff;margin-bottom:10px;font-size:15px}
.foot-inner a{color:#a7adc0;font-size:14px}
.foot-inner a:hover{color:#fff}
.copy{max-width:1180px;margin:0 auto;padding:18px 20px;border-top:1px solid #26233a;font-size:13px}
/* tool page */
.tool-hero{text-align:center;padding:56px 20px 30px;position:relative}
.tool-hero::before{content:'';position:absolute;top:-60px;left:50%;transform:translateX(-50%);width:520px;height:260px;background:radial-gradient(closest-side,rgba(124,58,237,.16),transparent);pointer-events:none}
.tool-hero h1{font-size:clamp(28px,4.5vw,42px);font-weight:900;letter-spacing:-1px;position:relative}
.tool-hero h1 span{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.tool-hero>p{color:var(--muted);max-width:660px;margin:14px auto 0;font-size:17px;position:relative}
.tool-hero .badges{position:relative}
.tool-box{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:34px;max-width:840px;margin:12px auto 44px;box-shadow:var(--shadow)}
.drop{border:2px dashed #b9bdf5;border-radius:16px;padding:44px 20px;text-align:center;cursor:pointer;transition:.2s;background:linear-gradient(180deg,#fafbff,#f4f5ff)}
.drop:hover,.drop.over{border-color:var(--violet);background:#f1efff;transform:scale(1.01)}
.drop .big{font-size:44px}
.drop p{color:var(--muted);font-size:15px;margin-top:10px}
.drop p strong{color:var(--indigo)}
.btn{display:inline-block;background:var(--grad);color:#fff;font-weight:800;border:none;padding:14px 34px;border-radius:12px;font-size:16px;cursor:pointer;transition:.2s;margin-top:16px;box-shadow:0 8px 20px rgba(124,58,237,.3)}
.btn:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(124,58,237,.4)}
.btn:disabled{background:#c9cdf5;cursor:default;box-shadow:none;transform:none}
.btn.secondary{background:#eef0ff;color:var(--indigo);box-shadow:none}
.btn.secondary:hover{background:#e0e4ff;box-shadow:none}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-top:14px}
label.fl{font-size:14px;font-weight:700;color:#374151}
input[type=text],input[type=number],select,textarea{border:1.5px solid var(--line);border-radius:12px;padding:12px 15px;font-size:15px;width:100%;font-family:inherit;transition:.2s;background:#fff}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--violet);box-shadow:0 0 0 3px rgba(124,58,237,.12)}
textarea{min-height:150px;resize:vertical}
.field{margin-top:14px}
.field small{color:var(--muted);font-size:12.5px}
#status{margin-top:16px;font-size:14.5px;color:var(--violet);font-weight:700;min-height:22px}
#result{margin-top:16px}
canvas.preview{max-width:100%;border:1px solid var(--line);border-radius:12px;margin-top:12px;box-shadow:0 6px 18px rgba(23,20,43,.08)}
pre.out{background:#14121f;color:#d7f9e3;border-radius:12px;padding:18px;overflow:auto;max-height:380px;font-size:13.5px;white-space:pre-wrap;margin-top:12px}
.howto{max-width:840px;margin:0 auto 44px}
.howto h2{font-size:23px;margin-bottom:14px;letter-spacing:-.4px}
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:14px;margin:16px 0 34px}
.step{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px;transition:.2s}
.step:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.step .n{background:var(--grad);color:#fff;width:32px;height:32px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font-weight:900;margin-bottom:10px}
.step h4{margin-bottom:4px}
.step p{font-size:13.5px;color:var(--muted)}
.note{background:#fffbeb;border:1px solid #fde68a;border-radius:14px;padding:18px 22px;max-width:840px;margin:0 auto 44px;font-size:14.5px;color:#92400e}
.side-box{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px;margin-top:16px}
.side-box h2{font-size:19px;margin-bottom:10px}
@keyframes fadeUp{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.tool-card,.tool-box,.step{animation:fadeUp .5s ease both}
.tools-grid .tool-card:nth-child(3n+1){animation-delay:.03s}.tools-grid .tool-card:nth-child(3n+2){animation-delay:.08s}
@media(max-width:640px){.tool-box{padding:22px}.top-inner nav{display:none}.hero{padding:56px 20px 44px}}