:root{
  --bg:#0b0f1a; --bg-soft:#121829; --card:#161d31; --line:#26304b;
  --txt:#e8edf7; --muted:#9aa6c2; --accent:#5eead4; --accent2:#818cf8;
  --good:#4ade80; --radius:16px; --maxw:1040px;
  --font:"Space Grotesk","Segoe UI",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
}
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&display=swap');
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--txt);font-family:var(--font);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
.hero{overflow:hidden}

.nav{display:flex;align-items:center;justify-content:space-between;max-width:var(--maxw);margin:0 auto;padding:20px 24px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--txt);font-weight:700;font-size:20px}
.brand-mark{width:32px;height:32px;border-radius:8px;display:block}
.accent{color:var(--accent)}
.nav-links{display:flex;align-items:center;gap:24px}
.nav-links a{color:var(--muted);text-decoration:none;font-size:15px;transition:color .2s}
.nav-links a:hover{color:var(--txt)}
.lang-btn{background:var(--card);color:var(--txt);border:1px solid var(--line);padding:7px 16px;border-radius:999px;cursor:pointer;font-family:inherit;font-size:14px;transition:.2s}
.lang-btn:hover{border-color:var(--accent);color:var(--accent)}

.hero{position:relative;text-align:center;max-width:var(--maxw);margin:0 auto;padding:70px 24px 40px}
.hero-glow{position:absolute;top:-80px;left:50%;transform:translateX(-50%);width:min(600px,90vw);height:400px;max-width:100%;background:radial-gradient(circle,rgba(94,234,212,.18),transparent 60%),radial-gradient(circle at 70% 40%,rgba(129,140,248,.16),transparent 55%);filter:blur(20px);z-index:0;pointer-events:none}
.hero h1{position:relative;z-index:1;font-size:clamp(34px,6vw,60px);line-height:1.1;font-weight:700;letter-spacing:-1px;animation:rise .7s ease both}
.hero-sub{position:relative;z-index:1;color:var(--muted);font-size:clamp(16px,2.2vw,19px);max-width:620px;margin:22px auto 0;animation:rise .7s .1s ease both}
.badges{position:relative;z-index:1;display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:30px;animation:rise .7s .2s ease both}
.badge{background:var(--bg-soft);border:1px solid var(--line);padding:8px 16px;border-radius:999px;font-size:14px;color:var(--txt)}
@keyframes rise{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}

.tool{max-width:760px;margin:20px auto 0;padding:0 24px}
.dropzone{border:2px dashed var(--line);border-radius:var(--radius);background:linear-gradient(180deg,var(--bg-soft),transparent);padding:54px 24px;text-align:center;cursor:pointer;transition:.25s}
.dropzone:hover,.dropzone.drag{border-color:var(--accent);background:linear-gradient(180deg,rgba(94,234,212,.06),transparent);transform:translateY(-2px)}
.dz-icon{font-size:46px;margin-bottom:10px}
.dz-title{font-size:18px;font-weight:600}
.dz-hint{color:var(--muted);font-size:14px;margin-top:6px}

.controls{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;margin-top:22px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px 20px}
.quality-row{display:flex;align-items:center;gap:12px;font-size:15px}
.quality-row input[type=range]{accent-color:var(--accent);width:160px}
#qualityVal{color:var(--accent);font-weight:600;min-width:42px}
.control-actions{display:flex;gap:10px}
.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent2));color:#06121a;border:none;padding:11px 20px;border-radius:10px;font-weight:600;font-family:inherit;cursor:pointer;font-size:15px;transition:.2s}
.btn-primary:hover{filter:brightness(1.08);transform:translateY(-1px)}
.btn-ghost{background:transparent;color:var(--muted);border:1px solid var(--line);padding:11px 18px;border-radius:10px;cursor:pointer;font-family:inherit;font-size:15px;transition:.2s}
.btn-ghost:hover{color:var(--txt);border-color:var(--muted)}

.results{display:grid;gap:12px;margin-top:20px}
.result-item{display:flex;align-items:center;gap:14px;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px 14px;animation:rise .4s ease both}
.thumb{width:54px;height:54px;border-radius:8px;object-fit:cover;flex-shrink:0;background:var(--bg)}
.r-info{flex:1;min-width:0}
.r-name{font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.r-sizes{font-size:13px;color:var(--muted);margin-top:2px}
.r-save{color:var(--good);font-weight:600}
.r-dl{background:var(--bg-soft);border:1px solid var(--line);color:var(--txt);text-decoration:none;padding:8px 14px;border-radius:8px;font-size:13px;transition:.2s;white-space:nowrap}
.r-dl:hover{border-color:var(--accent);color:var(--accent)}

.how,.faq{max-width:var(--maxw);margin:80px auto 0;padding:0 24px}
.how h2,.faq h2{font-size:30px;text-align:center;margin-bottom:36px}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:.25s}
.card:hover{transform:translateY(-4px);border-color:var(--accent)}
.card-ico{font-size:32px;margin-bottom:12px}
.card h3{font-size:18px;margin-bottom:8px}
.card p{color:var(--muted);font-size:15px}

.faq details{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 20px;margin-bottom:12px;cursor:pointer}
.faq summary{font-weight:600;font-size:16px;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+";color:var(--accent);font-weight:700;margin-right:10px}
.faq details[open] summary::before{content:"–"}
.faq details p{color:var(--muted);margin-top:10px;font-size:15px}

.lead{max-width:760px;margin:80px auto 0;padding:0 24px}
.lead h2{font-size:26px;margin-bottom:18px;text-align:center;line-height:1.3}
.lead p{color:var(--muted);font-size:16px;line-height:1.7}
.lp-steps{margin:24px 0 0;padding:0;list-style:none;counter-reset:step}
.lp-steps li{counter-increment:step;color:var(--muted);font-size:15px;padding:12px 0 12px 44px;position:relative;border-bottom:1px solid var(--line)}
.lp-steps li:last-child{border-bottom:none}
.lp-steps li::before{content:counter(step);position:absolute;left:0;top:10px;width:28px;height:28px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#0b0f1a;font-weight:700;font-size:14px;display:flex;align-items:center;justify-content:center}

.usecases{max-width:900px;margin:80px auto 0;padding:0 24px;text-align:center}
.usecases h2{font-size:26px;margin-bottom:10px}
.usecases-sub{color:var(--muted);font-size:15px;margin-bottom:24px}
.usecase-links{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}
.usecase-links a{background:var(--card);border:1px solid var(--line);color:var(--txt);text-decoration:none;padding:11px 18px;border-radius:999px;font-size:14px;transition:.2s}
.usecase-links a:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px)}

.footer{text-align:center;color:var(--muted);font-size:14px;padding:60px 24px 40px;margin-top:80px;border-top:1px solid var(--line)}

@media(max-width:600px){
  .nav-links{gap:14px}
  .nav-links a[href="#how"]{display:none}
  .controls{flex-direction:column;align-items:stretch}
  .control-actions{justify-content:space-between}
}