:root{
  --bg:#0b0e14;
  --bg-2:#11151d;
  --card:#161b25;
  --card-border:#242b3a;
  --ink:#eef1f6;
  --ink-dim:#9aa4b7;
  --ink-faint:#5f697c;
  --accent:#58e6c9;
  --accent-ink:#04231d;
  --accent-dim:#1c3a36;
  --danger:#ff6b6b;
  --danger-bg:#2a1418;
  --radius:16px;
  --shadow:0 20px 60px -20px rgba(0,0,0,.5);
  font-synthesis:none;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg);
  color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,Helvetica,Arial,sans-serif;
  min-height:100vh;
  position:relative;
  overflow-x:hidden;
}

.bg-glow{
  position:fixed;
  inset:0;
  z-index:0;
  background:
    radial-gradient(600px 400px at 15% -10%, rgba(88,230,201,.10), transparent 60%),
    radial-gradient(500px 380px at 100% 10%, rgba(88,140,230,.08), transparent 60%),
    var(--bg);
  pointer-events:none;
}

.topbar{
  position:relative;
  z-index:1;
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:20px clamp(16px,5vw,48px);
}
.brand{display:flex;align-items:center;gap:10px}
.brand-mark svg{width:28px;height:28px;display:block}
.brand-name{font-weight:700;font-size:1.05rem;letter-spacing:-0.01em}
.topbar-link{color:var(--ink-dim);text-decoration:none;font-size:.9rem}
.topbar-link:hover{color:var(--accent)}

.wrap{
  position:relative;
  z-index:1;
  max-width:640px;
  margin:0 auto;
  padding:12px clamp(16px,5vw,24px) 60px;
}

.hero{text-align:center;padding:28px 0 32px}
.hero h1{
  font-size:clamp(1.8rem,4.5vw,2.5rem);
  margin:0 0 12px;
  letter-spacing:-0.02em;
  line-height:1.15;
}
.hero .sub{
  color:var(--ink-dim);
  font-size:1.02rem;
  line-height:1.6;
  max-width:480px;
  margin:0 auto;
}

.card{
  background:var(--card);
  border:1px solid var(--card-border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:clamp(20px,4vw,32px);
  margin-bottom:20px;
}

.dropzone{
  text-align:center;
  cursor:pointer;
  border:2px dashed var(--card-border);
  padding:clamp(32px,7vw,52px) 24px;
  transition:border-color .15s ease, background .15s ease, transform .1s ease;
}
.dropzone:hover, .dropzone:focus-visible{border-color:var(--accent);outline:none}
.dropzone.drag-over{
  border-color:var(--accent);
  background:rgba(88,230,201,.06);
  transform:scale(1.005);
}
.dz-icon{color:var(--accent);margin-bottom:14px}
.dz-title{font-size:1.1rem;font-weight:600;margin:0 0 6px}
.dz-sub{color:var(--ink-faint);font-size:.85rem;margin:0}
.format-chips{
  display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin-top:18px;
}
.format-chips span{
  font-size:.72rem;font-weight:600;letter-spacing:.03em;
  color:var(--ink-dim);
  background:var(--bg-2);
  border:1px solid var(--card-border);
  padding:4px 10px;border-radius:999px;
}

.file-row{display:flex;align-items:center;gap:14px;margin-bottom:22px}
.file-icon{font-size:1.6rem;line-height:1}
.file-meta{flex:1;min-width:0}
.file-name{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.file-sub{color:var(--ink-faint);font-size:.82rem;margin-top:2px}

.modes{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:22px}
@media (max-width:520px){.modes{grid-template-columns:1fr}}
.mode-btn{
  text-align:left;
  background:var(--bg-2);
  border:1px solid var(--card-border);
  border-radius:12px;
  padding:14px;
  cursor:pointer;
  color:var(--ink);
  display:flex;flex-direction:column;gap:4px;
  transition:border-color .15s ease, background .15s ease;
}
.mode-btn:hover{border-color:#3a4256}
.mode-btn.active{
  border-color:var(--accent);
  background:rgba(88,230,201,.08);
}
.mode-title{font-weight:700;font-size:.92rem}
.mode-desc{color:var(--ink-faint);font-size:.76rem;line-height:1.4}

.opts{display:flex;flex-direction:column;gap:16px;margin-bottom:22px;padding-top:4px}
.field{display:flex;flex-direction:column;gap:8px;font-size:.85rem;color:var(--ink-dim)}
.field select, .field input[type=range]{
  accent-color:var(--accent);
}
.field select{
  background:var(--bg-2);
  color:var(--ink);
  border:1px solid var(--card-border);
  border-radius:10px;
  padding:10px 12px;
  font-size:.92rem;
}
.field b{color:var(--accent);font-weight:700}
.range-labels{display:flex;justify-content:space-between;font-size:.72rem;color:var(--ink-faint)}
.hint{
  font-size:.78rem;
  color:var(--ink-faint);
  line-height:1.5;
  background:var(--bg-2);
  border:1px solid var(--card-border);
  border-radius:10px;
  padding:10px 12px;
  margin:0;
}
.hint-warning{
  color:#ffd9a8;
  background:#2a1f12;
  border-color:#4a3620;
  margin-bottom:14px;
}
.hint strong{color:var(--ink)}

.btn-primary{
  display:inline-flex;align-items:center;justify-content:center;
  width:100%;
  background:var(--accent);
  color:var(--accent-ink);
  border:none;
  font-weight:700;
  font-size:.98rem;
  padding:14px 20px;
  border-radius:12px;
  cursor:pointer;
  text-decoration:none;
  transition:transform .08s ease, opacity .15s ease;
}
.btn-primary:hover{opacity:.92}
.btn-primary:active{transform:scale(.98)}
.btn-primary:disabled{opacity:.5;cursor:not-allowed}

.btn-ghost{
  background:transparent;
  color:var(--ink-dim);
  border:1px solid var(--card-border);
  padding:9px 14px;
  border-radius:10px;
  cursor:pointer;
  font-size:.85rem;
}
.btn-ghost:hover{color:var(--ink);border-color:#3a4256}

.progress-head{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:12px}
#progress-title{font-weight:600}
#progress-pct{color:var(--accent);font-weight:700;font-variant-numeric:tabular-nums}
.progress-track{
  height:10px;background:var(--bg-2);border-radius:999px;overflow:hidden;
  border:1px solid var(--card-border);
}
.progress-fill{
  height:100%;width:0%;
  background:linear-gradient(90deg,var(--accent),#7ce8ff);
  transition:width .25s ease;
}
.progress-fill.indeterminate{
  width:40%;
  animation:indeterminate 1.1s ease-in-out infinite;
}
@keyframes indeterminate{
  0%{transform:translateX(-100%)}
  100%{transform:translateX(250%)}
}
.progress-note{color:var(--ink-faint);font-size:.8rem;margin-top:14px;line-height:1.5}
.log-details{margin-top:14px}
.log-details summary{color:var(--ink-dim);font-size:.82rem;cursor:pointer}
.log-box{
  margin-top:10px;
  max-height:160px;
  overflow-y:auto;
  background:var(--bg-2);
  border:1px solid var(--card-border);
  border-radius:10px;
  padding:12px;
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-size:.72rem;
  color:var(--ink-faint);
  white-space:pre-wrap;
  word-break:break-all;
}
#cancel-btn{margin-top:18px;width:100%}

.error-card{text-align:center}
.error-icon{font-size:2rem;margin-bottom:10px}
.error-title{font-weight:700;font-size:1.1rem;margin-bottom:8px;color:var(--danger)}
.error-message{color:var(--ink-dim);font-size:.9rem;line-height:1.5;margin-bottom:22px;
  background:var(--danger-bg);border:1px solid #3a2028;border-radius:10px;padding:12px;text-align:left;
}
.error-actions{display:flex;gap:10px}
.error-actions .btn-primary, .error-actions .btn-ghost{flex:1}

.done-card{text-align:center}
.done-icon{
  width:52px;height:52px;border-radius:50%;
  background:var(--accent-dim);color:var(--accent);
  display:flex;align-items:center;justify-content:center;
  font-size:1.5rem;margin:0 auto 12px;
}
.done-title{font-weight:700;font-size:1.15rem;margin-bottom:20px}
.size-compare{
  display:flex;align-items:center;justify-content:center;gap:16px;
  margin-bottom:24px;flex-wrap:wrap;
}
.size-box{display:flex;flex-direction:column;gap:4px;min-width:110px}
.size-label{font-size:.72rem;color:var(--ink-faint);text-transform:uppercase;letter-spacing:.04em}
.size-value{font-weight:700;font-size:1.05rem}
.size-arrow{color:var(--ink-faint);font-size:1.2rem}
.size-delta{
  font-size:.78rem;font-weight:700;color:var(--accent);
  background:var(--accent-dim);padding:4px 10px;border-radius:999px;
  width:100%;
}
.done-card #reset-btn{margin-top:12px;width:100%}

.site-footer{
  position:relative;z-index:1;
  max-width:640px;margin:0 auto;
  padding:0 clamp(16px,5vw,24px) 48px;
  color:var(--ink-faint);
  font-size:.76rem;
  line-height:1.6;
  text-align:center;
}

@media (max-width:480px){
  .topbar{padding:16px}
}