:root{
  --bg:#0b1120; --bg2:#0f172a; --panel:#131c31; --panel2:#18233c;
  --line:#24304d; --text:#e8edf7; --muted:#93a1bd;
  --accent:#48e5c1; --accent-dark:#22b894; --danger:#ff7a7a;
  --radius:12px; --shadow:0 10px 30px rgba(0,0,0,.35),0 2px 8px rgba(0,0,0,.25);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,"Segoe UI",Roboto,Inter,sans-serif;
  background:radial-gradient(1100px 500px at 50% -120px,#16233f 0%,var(--bg) 60%);
  color:var(--text); line-height:1.6; min-height:100vh;
}
.hidden{display:none!important}
kbd{background:var(--panel2);border:1px solid var(--line);border-radius:5px;padding:.05em .45em;font-size:.85em}

/* Topbar */
.topbar{display:flex;justify-content:space-between;align-items:center;padding:14px clamp(16px,4vw,40px);max-width:1080px;margin:0 auto}
.brand{display:flex;gap:9px;align-items:center;color:var(--text);text-decoration:none;font-weight:700;letter-spacing:.02em}
.topbar nav{display:flex;gap:clamp(10px,3vw,26px)}
.topbar a{color:var(--muted);text-decoration:none;font-size:.88rem;letter-spacing:.04em;transition:color .18s}
.topbar a:hover{color:var(--accent)}

/* Hero */
.hero{text-align:center;padding:clamp(20px,5vh,48px) 20px 28px;max-width:720px;margin:0 auto}
.hero-kicker{font-size:.75rem;letter-spacing:.22em;text-transform:uppercase;color:var(--accent);font-weight:600;margin-bottom:12px}
h1{font-size:clamp(1.9rem,5.5vw,3rem);letter-spacing:-.02em;line-height:1.12;font-weight:800}
.hero-sub{color:var(--muted);margin-top:14px;font-size:clamp(.95rem,2.5vw,1.05rem)}

/* Tool */
.tool{max-width:1000px;margin:0 auto;padding:0 16px;display:grid;grid-template-columns:1fr 1fr;gap:18px}
.panel{background:linear-gradient(180deg,var(--panel),var(--bg2));border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.panel-drop{min-height:340px;display:flex;flex-direction:column;position:relative;cursor:pointer;transition:border-color .2s,transform .2s}
.panel-drop:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.panel-drop.dragover{border-color:var(--accent);transform:scale(1.01)}
.dz-idle{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;padding:32px 20px;text-align:center}
.dz-icon{width:56px;height:56px;color:var(--accent);opacity:.9;margin-bottom:8px;animation:float 3.5s ease-in-out infinite}
@keyframes float{50%{transform:translateY(-6px)}}
.dz-title{font-weight:700;font-size:1.08rem}
.dz-hint{color:var(--muted);font-size:.92rem}
.linklike{color:var(--accent);text-decoration:underline;text-underline-offset:3px}
.dz-meta{color:#5e6c8a;font-size:.78rem;letter-spacing:.06em;margin-top:10px;text-transform:uppercase}

.dz-preview{flex:1;display:flex;flex-direction:column;min-height:0}
.preview-viewport{flex:1;overflow:auto;display:flex;align-items:center;justify-content:center;background:
  repeating-conic-gradient(#0d1526 0% 25%,#101a2e 0% 50%) 0/22px 22px;min-height:230px;max-height:300px}
#previewImg{transform-origin:center;max-width:none;transition:transform .15s ease;border-radius:4px}
.preview-bar{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:10px 12px;border-top:1px solid var(--line);background:var(--panel2);flex-wrap:wrap}
.file-meta{color:var(--muted);font-size:.8rem;max-width:55%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.preview-actions{display:flex;align-items:center;gap:6px}
.icon-btn{width:34px;height:34px;border-radius:8px;border:1px solid var(--line);background:transparent;color:var(--text);cursor:pointer;font-size:1.05rem;display:inline-flex;align-items:center;justify-content:center;transition:all .18s}
.icon-btn:hover{border-color:var(--accent);color:var(--accent)}
.icon-btn.danger:hover{border-color:var(--danger);color:var(--danger)}
.zoom-label{font-size:.78rem;color:var(--muted);min-width:42px;text-align:center;font-variant-numeric:tabular-nums}

.dz-progress{position:absolute;inset:0;background:rgba(11,17,32,.92);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;padding:30px;z-index:2}
.scanline{width:70%;height:2px;background:linear-gradient(90deg,transparent,var(--accent),transparent);animation:scan 1.4s ease-in-out infinite alternate}
@keyframes scan{from{transform:translateX(-45%)}to{transform:translateX(45%)}}
.progress-label{color:var(--muted);font-size:.9rem;letter-spacing:.05em}
.progress-track{width:70%;height:6px;background:var(--line);border-radius:99px;overflow:hidden}
.progress-fill{height:100%;width:0;background:linear-gradient(90deg,var(--accent-dark),var(--accent));border-radius:99px;transition:width .25s ease}

/* Result panel */
.panel-result{display:flex;flex-direction:column;padding:18px}
.result-head{display:flex;justify-content:space-between;align-items:baseline;gap:10px;flex-wrap:wrap;margin-bottom:10px}
.result-head h2{font-size:1.05rem;letter-spacing:.03em}
.stats{color:var(--muted);font-size:.78rem;font-variant-numeric:tabular-nums}
#outputText{flex:1;min-height:200px;resize:vertical;background:#0d1526;border:1px solid var(--line);border-radius:10px;color:var(--text);padding:14px;font:inherit;font-size:.95rem;line-height:1.55;transition:border-color .18s}
#outputText:focus{outline:none;border-color:var(--accent)}
#outputText::placeholder{color:#5e6c8a}
.result-msg{margin-top:10px;padding:10px 14px;border-radius:9px;font-size:.88rem;border:1px solid}
.result-msg.error{color:var(--danger);border-color:rgba(255,122,122,.4);background:rgba(255,122,122,.08)}
.result-msg.info{color:var(--accent);border-color:rgba(72,229,193,.4);background:rgba(72,229,193,.07)}
.result-actions{display:flex;gap:9px;margin-top:14px;flex-wrap:wrap}
.btn{padding:11px 18px;min-height:44px;border-radius:9px;border:1px solid var(--line);background:var(--panel2);color:var(--text);font:inherit;font-weight:600;font-size:.9rem;letter-spacing:.03em;cursor:pointer;transition:all .18s;text-decoration:none;display:inline-flex;align-items:center;justify-content:center}
.btn:hover:not(:disabled){border-color:var(--accent);color:var(--accent);transform:translateY(-1px)}
.btn:disabled{opacity:.4;cursor:not-allowed}
.btn-primary{background:linear-gradient(135deg,var(--accent-dark),var(--accent));border-color:transparent;color:#06251d}
.btn-primary:hover:not(:disabled){color:#06251d;filter:brightness(1.08)}
.btn-ghost{background:transparent}
.btn:focus-visible,.icon-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* Content */
.content{max-width:760px;margin:0 auto;padding:44px 20px 20px;display:grid;gap:36px}
.content h2{font-size:1.35rem;letter-spacing:-.01em;margin-bottom:14px}
.content p{color:var(--muted)}
.steps{list-style:none;counter-reset:s;display:grid;gap:14px}
.steps li{counter-increment:s;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:14px 16px 14px 52px;position:relative;color:var(--muted)}
.steps li strong{color:var(--text)}
.steps li::before{content:counter(s);position:absolute;left:14px;top:13px;width:26px;height:26px;border-radius:8px;background:rgba(72,229,193,.14);color:var(--accent);font-weight:700;font-size:.85rem;display:flex;align-items:center;justify-content:center}
.tips{list-style:none;display:grid;gap:10px;color:var(--muted)}
.tips li{padding-left:22px;position:relative}
.tips li::before{content:"";position:absolute;left:2px;top:.62em;width:8px;height:8px;border-radius:2px;background:var(--accent)}
code{background:var(--panel2);border:1px solid var(--line);border-radius:5px;padding:.1em .4em;font-size:.86em;color:var(--accent)}
details{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:14px 18px;margin-bottom:10px}
summary{cursor:pointer;font-weight:600;list-style:none;display:flex;align-items:center;gap:10px}
summary::before{content:"+";color:var(--accent);font-weight:700;font-size:1.1rem;transition:transform .2s}
details[open] summary::before{transform:rotate(45deg)}
details p{margin-top:10px;font-size:.94rem}
.cta-box{text-align:center;background:linear-gradient(160deg,rgba(72,229,193,.1),rgba(72,229,193,.02));border:1px solid rgba(72,229,193,.3);border-radius:var(--radius);padding:34px 24px}
.cta-box p{margin:8px 0 20px}

/* Footer / toast / adsense */
.footer{max-width:1080px;margin:30px auto 0;padding:22px 20px 34px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;color:var(--muted);font-size:.85rem}
.footer nav{display:flex;gap:18px}
.footer a{color:var(--muted);text-decoration:none}
.footer a:hover{color:var(--accent)}
.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%,80px);background:var(--panel2);border:1px solid var(--accent);color:var(--text);padding:11px 22px;border-radius:99px;font-size:.9rem;box-shadow:var(--shadow);opacity:0;transition:all .3s;z-index:50;pointer-events:none}
.toast.show{opacity:1;transform:translate(-50%,0)}
.ad-slot{min-height:120px;display:flex;align-items:center;justify-content:center;color:#4a5878;font-size:.75rem;letter-spacing:.15em;text-transform:uppercase;border:1px dashed var(--line);border-radius:10px;margin:26px auto;max-width:760px}

@media (max-width:860px){
  .tool{grid-template-columns:1fr}
  .panel-drop{min-height:280px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
}