:root{
  --bg:#08090d; --panel:rgba(20,22,30,.85); --card:rgba(28,32,42,.7); --border:rgba(255,255,255,.06);
  --fg:#e8ecf4; --muted:#8a94a8; --accent:#6366f1; --accent2:#06d6a0; --glow:rgba(99,102,241,.15);
  --radius:16px; --maxw:960px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--fg);font-family:"Inter",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.6;-webkit-font-smoothing:antialiased;min-height:100vh;overflow-x:hidden}
body::before{content:'';position:fixed;inset:0;background:radial-gradient(ellipse 80% 50% at 50% -20%,rgba(99,102,241,.12),transparent),radial-gradient(ellipse 60% 40% at 80% 100%,rgba(6,214,160,.06),transparent);pointer-events:none;z-index:0}
a{color:inherit;text-decoration:none}
main{max-width:var(--maxw);margin:0 auto;padding:0 20px;position:relative;z-index:1}

/* Header */
.site-header{display:flex;align-items:center;justify-content:space-between;max-width:var(--maxw);margin:0 auto;padding:20px 20px;position:relative;z-index:10}
.logo{font-size:22px;font-weight:800;display:flex;align-items:center;gap:6px}
.logo span{font-size:13px;color:var(--muted);font-weight:400;letter-spacing:.5px;text-transform:uppercase}
.site-header nav{display:flex;gap:4px;flex-wrap:wrap}
.site-header nav a{padding:8px 14px;border-radius:10px;color:var(--muted);font-size:14px;font-weight:500;transition:all .2s;border:1px solid transparent}
.site-header nav a:hover{color:var(--fg);background:var(--glow);border-color:var(--border)}
.site-header nav a.active{color:var(--fg);background:var(--glow);border-color:rgba(99,102,241,.25);box-shadow:0 0 20px rgba(99,102,241,.1)}

/* Hero */
.hero{text-align:center;padding:56px 0 36px;position:relative}
.hero::before{content:'';position:absolute;top:-60px;left:50%;transform:translateX(-50%);width:600px;height:300px;background:radial-gradient(ellipse,rgba(99,102,241,.1) 0%,transparent 70%);pointer-events:none}
.hero h1{font-size:clamp(32px,5vw,46px);font-weight:800;letter-spacing:-.5px;background:linear-gradient(135deg,#fff 0%,var(--accent) 50%,var(--accent2) 100%);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;animation:shimmer 3s ease-in-out infinite alternate}
@keyframes shimmer{0%{background-position:0% 50%}100%{background-position:100% 50%}}
.hero .sub{color:var(--muted);font-size:17px;margin-top:14px;max-width:540px;margin-left:auto;margin-right:auto}
.hero strong{color:var(--accent2);font-weight:600}

/* Tool panel */
.tool{background:var(--panel);backdrop-filter:blur(20px) saturate(1.4);-webkit-backdrop-filter:blur(20px) saturate(1.4);border:1px solid var(--border);border-radius:var(--radius);padding:28px;margin-bottom:40px;box-shadow:0 8px 32px rgba(0,0,0,.3),inset 0 1px 0 rgba(255,255,255,.04);transition:box-shadow .3s}
.tool:hover{box-shadow:0 12px 48px rgba(0,0,0,.4),inset 0 1px 0 rgba(255,255,255,.06)}

/* Dropzone */
.dropzone{border:2px dashed rgba(99,102,241,.3);border-radius:var(--radius);padding:52px 20px;text-align:center;cursor:pointer;transition:all .25s;background:rgba(99,102,241,.03);position:relative;overflow:hidden}
.dropzone::after{content:'';position:absolute;inset:0;background:radial-gradient(circle at var(--mx,50%) var(--my,50%),rgba(99,102,241,.08),transparent 60%);pointer-events:none;opacity:0;transition:opacity .3s}
.dropzone:hover::after,.dropzone.drag::after{opacity:1}
.dropzone:hover,.dropzone.drag{border-color:var(--accent);background:rgba(99,102,241,.06);transform:scale(1.005)}
.dz-icon{font-size:48px;margin-bottom:12px;filter:drop-shadow(0 4px 12px rgba(99,102,241,.3))}
.dz-inner p{color:var(--muted)}
.dz-inner strong{color:var(--fg)}
.dz-hint{font-size:13px;margin-top:8px;opacity:.6}

/* Controls */
.controls{margin-top:24px}
.controls label{display:block;font-size:13px;color:var(--muted);margin-bottom:8px;letter-spacing:.3px;text-transform:uppercase}
.controls output{color:var(--accent);font-weight:700}
input[type=range]{width:100%;accent-color:var(--accent);height:6px;border-radius:3px;cursor:pointer}
.btn-row{display:flex;gap:10px;margin-top:18px;justify-content:flex-end}
.btn{padding:10px 22px;border-radius:12px;border:1px solid var(--border);background:var(--card);backdrop-filter:blur(10px);color:var(--fg);font-size:14px;cursor:pointer;font-weight:600;transition:all .2s;letter-spacing:.2px}
.btn:hover{border-color:rgba(99,102,241,.4);box-shadow:0 4px 16px rgba(99,102,241,.15);transform:translateY(-1px)}
.btn.primary{background:linear-gradient(135deg,var(--accent),#818cf8);border-color:var(--accent);color:#fff;box-shadow:0 4px 20px rgba(99,102,241,.3)}
.btn.primary:hover{box-shadow:0 6px 28px rgba(99,102,241,.45);transform:translateY(-2px)}
.btn.ghost{background:transparent;border-color:var(--border)}

/* Item list */
.list{margin-top:20px;display:flex;flex-direction:column;gap:10px}
.item{display:flex;align-items:center;gap:14px;background:var(--card);backdrop-filter:blur(8px);border:1px solid var(--border);border-radius:14px;padding:14px;transition:all .2s}
.item:hover{border-color:rgba(99,102,241,.2);box-shadow:0 4px 16px rgba(0,0,0,.2)}
.item img{width:52px;height:52px;object-fit:cover;border-radius:10px;background:var(--bg);flex-shrink:0;box-shadow:0 2px 8px rgba(0,0,0,.3)}
.item .meta{flex:1;min-width:0}
.item .name{font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-weight:500}
.item .sizes{font-size:13px;color:var(--muted);margin-top:3px}
.item .save{color:var(--accent2);font-weight:700}
.item .dl{padding:8px 16px;border-radius:10px;background:linear-gradient(135deg,var(--accent),#818cf8);color:#fff;font-size:13px;font-weight:600;cursor:pointer;border:none;white-space:nowrap;box-shadow:0 2px 12px rgba(99,102,241,.3);transition:all .2s}
.item .dl:hover{box-shadow:0 4px 20px rgba(99,102,241,.5);transform:scale(1.04)}
.item .spin{font-size:13px;color:var(--muted);animation:pulse 1.2s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}

/* Section headers */
section h2{font-size:28px;font-weight:800;margin:0 0 22px;text-align:center;letter-spacing:-.3px}

/* Cards grid */
.why{margin-bottom:48px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px}
.card{background:var(--card);backdrop-filter:blur(12px);border:1px solid var(--border);border-radius:14px;padding:22px;transition:all .25s;position:relative;overflow:hidden}
.card::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;background:linear-gradient(90deg,transparent,var(--accent),var(--accent2),transparent);opacity:0;transition:opacity .3s}
.card:hover{border-color:rgba(99,102,241,.2);transform:translateY(-3px);box-shadow:0 8px 32px rgba(0,0,0,.25)}
.card:hover::before{opacity:1}
.card h3{font-size:16px;margin-bottom:8px;font-weight:700}
.card p{color:var(--muted);font-size:14px;line-height:1.7}

/* FAQ */
.faq{margin-bottom:48px}
.faq details{background:var(--card);backdrop-filter:blur(8px);border:1px solid var(--border);border-radius:14px;padding:16px 20px;margin-bottom:10px;transition:all .2s}
.faq details:hover{border-color:rgba(99,102,241,.15)}
.faq details[open]{border-color:rgba(99,102,241,.2);box-shadow:0 4px 16px rgba(0,0,0,.15)}
.faq summary{cursor:pointer;font-weight:600;font-size:15px;list-style:none;display:flex;align-items:center;gap:10px}
.faq summary::before{content:'›';font-size:20px;color:var(--accent);transition:transform .2s;flex-shrink:0}
.faq details[open] summary::before{transform:rotate(90deg)}
.faq details[open] summary{margin-bottom:10px}
.faq p{color:var(--muted);font-size:14px;line-height:1.8}

/* Footer */
.site-footer{border-top:1px solid var(--border);margin-top:24px;padding:32px 20px;text-align:center;color:var(--muted);font-size:13px;position:relative;z-index:1}
.site-footer nav{display:flex;gap:20px;justify-content:center;margin-top:14px;flex-wrap:wrap}
.site-footer nav a{transition:color .2s}
.site-footer nav a:hover{color:var(--accent)}

/* Responsive */
@media(max-width:640px){
  .hero h1{font-size:28px}
  .site-header{flex-direction:column;gap:14px}
  .site-header nav{justify-content:center}
  .tool{padding:18px}
  .grid{grid-template-columns:1fr}
}

/* Smooth mouse glow on dropzone */
@media(hover:hover){
  .dropzone{--mx:50%;--my:50%}
}