:root{
  --bg: #0a0a0c;
  --bg-2: #0f1012;
  --ink: #f2f2f4;
  --ink-dim: #98989f;
  --ink-faint: #5c5c63;
  --line: rgba(255,255,255,0.09);
  --line-soft: rgba(255,255,255,0.05);
  --glass: rgba(255,255,255,0.045);
  --glass-strong: rgba(255,255,255,0.08);
  --accent: #cfd3da;
  --accent-glow: rgba(150,175,255,0.35);
  --good: #7fe3a8;
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
}

*{ box-sizing: border-box; }

html,body{
  margin:0;
  padding:0;
  background: var(--bg);
  color: var(--ink);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

@media (prefers-reduced-motion: reduce){
  *{ animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

::selection{ background: rgba(180,195,255,0.25); }

.wrap{
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ambient background */
.noise{
  position: fixed; inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='90' height='90'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
.glow{
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  z-index: 0;
  pointer-events: none;
}
.glow-a{
  width: 520px; height: 520px;
  top: -220px; left: 50%;
  transform: translateX(-60%);
  background: radial-gradient(circle, rgba(120,140,210,0.18), transparent 70%);
}
.glow-b{
  width: 460px; height: 460px;
  bottom: -260px; right: -120px;
  background: radial-gradient(circle, rgba(160,150,190,0.12), transparent 70%);
}

/* topbar */
.topbar{
  position: relative;
  z-index: 2;
  padding: 28px 0 0;
}
.topbar-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.mark{ display:flex; align-items:center; gap:9px; }
.mark-dot{
  width: 9px; height: 9px;
  border-radius: 50%;
  background: linear-gradient(135deg, #e7e9ee, #8890a0);
  box-shadow: 0 0 12px rgba(200,210,240,0.5);
}
.mark-text{
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
}
.tag{
  font-size: 12.5px;
  color: var(--ink-faint);
  font-weight: 500;
}

/* hero */
main.wrap{ position: relative; z-index: 2; }
.hero{
  padding: 76px 0 40px;
  text-align: left;
}
.hero-title{
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: clamp(34px, 6.4vw, 52px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  background: linear-gradient(180deg, #ffffff 0%, #b9bbc4 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub{
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-dim);
  max-width: 46ch;
  margin: 0;
}

/* glass panel */
.panel{
  position: relative;
  margin: 8px 0 64px;
  padding: 28px;
  border-radius: var(--radius-lg);
  background:
    linear-gradient(155deg, rgba(255,255,255,0.09), rgba(255,255,255,0.015) 40%, rgba(255,255,255,0.03) 100%);
  border: 1px solid var(--line);
  backdrop-filter: blur(28px) saturate(140%);
  -webkit-backdrop-filter: blur(28px) saturate(140%);
  box-shadow:
    0 1px 0 rgba(255,255,255,0.12) inset,
    0 24px 60px -20px rgba(0,0,0,0.6),
    0 0 0 1px rgba(0,0,0,0.2);
}
.panel::before{
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(160deg, rgba(255,255,255,0.35), rgba(255,255,255,0) 30%, rgba(255,255,255,0.06) 100%);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  opacity: 0.7;
}

/* dropzone */
.dropzone{
  position: relative;
  border-radius: var(--radius-md);
  border: 1.5px dashed rgba(255,255,255,0.16);
  background: rgba(255,255,255,0.025);
  padding: 46px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.25s ease, background 0.25s ease, transform 0.25s ease;
}
.dropzone:hover, .dropzone:focus-visible{
  border-color: rgba(255,255,255,0.32);
  background: rgba(255,255,255,0.045);
  outline: none;
}
.dropzone.drag-over{
  border-color: rgba(180,195,255,0.6);
  background: rgba(150,175,255,0.06);
  transform: scale(1.008);
}
.dz-icon{
  color: var(--ink-dim);
  margin-bottom: 14px;
}
.dz-icon-file{ color: #d7d9de; }
.dz-title{
  font-size: 16.5px;
  font-weight: 600;
  margin: 0 0 6px;
  color: var(--ink);
}
.dz-hint{
  font-size: 13.5px;
  color: var(--ink-faint);
  margin: 0;
}
.dz-filename{
  font-size: 15.5px;
  font-weight: 600;
  margin: 0 0 14px;
  color: var(--ink);
  word-break: break-all;
  padding: 0 8px;
}
.ghost-btn{
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.04);
  color: var(--ink-dim);
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  padding: 9px 16px;
  border-radius: 100px;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.ghost-btn:hover{ border-color: rgba(255,255,255,0.28); color: var(--ink); }

/* name field */
.field{ margin-top: 22px; }
.field label{
  display: block;
  font-size: 12.5px;
  color: var(--ink-faint);
  margin-bottom: 8px;
  font-weight: 500;
}
.input-row{
  display: flex;
  align-items: center;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.03);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color 0.2s ease;
}
.input-row:focus-within{ border-color: rgba(255,255,255,0.32); }
.input-row input{
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--ink);
  font-family: inherit;
  font-size: 15px;
  padding: 13px 4px 13px 16px;
  min-width: 0;
}
.input-row .ext{
  color: var(--ink-faint);
  font-size: 15px;
  padding-right: 16px;
  user-select: none;
}

/* actions */
.actions{ margin-top: 22px; }
.primary-btn{
  width: 100%;
  border: none;
  border-radius: var(--radius-sm);
  padding: 15px 20px;
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 15.5px;
  letter-spacing: -0.005em;
  color: #0a0a0c;
  background: linear-gradient(180deg, #ffffff, #c7cad2);
  cursor: pointer;
  box-shadow: 0 10px 30px -8px rgba(255,255,255,0.18), 0 1px 0 rgba(255,255,255,0.6) inset;
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease;
}
.primary-btn:hover{ transform: translateY(-1px); }
.primary-btn:active{ transform: translateY(0px) scale(0.99); }
.primary-btn:disabled{ opacity: 0.5; cursor: not-allowed; transform: none; }

/* progress */
.progress-block{ margin-top: 24px; }
.progress-top{
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--ink-dim);
  margin-bottom: 10px;
}
.progress-pct{ color: var(--ink); font-weight: 600; font-variant-numeric: tabular-nums; }
.progress-track{
  height: 6px;
  border-radius: 100px;
  background: rgba(255,255,255,0.07);
  overflow: hidden;
}
.progress-fill{
  height: 100%;
  width: 0%;
  border-radius: 100px;
  background: linear-gradient(90deg, #9aa4c4, #eef0f5);
  transition: width 0.3s ease;
}

/* result */
.result-block{
  margin-top: 24px;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px;
  border-radius: var(--radius-md);
  background: rgba(127,227,168,0.06);
  border: 1px solid rgba(127,227,168,0.18);
}
.result-icon{
  flex-shrink: 0;
  width: 40px; height: 40px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: rgba(127,227,168,0.14);
  color: var(--good);
}
.result-text{ flex: 1; min-width: 0; }
.result-title{ margin: 0 0 3px; font-size: 15px; font-weight: 600; }
.result-sub{ margin: 0; font-size: 13px; color: var(--ink-dim); word-break: break-all; }
.download-btn{
  flex-shrink: 0;
  display: flex; align-items: center; gap: 7px;
  text-decoration: none;
  color: #0a0a0c;
  background: #eef0f5;
  font-weight: 600;
  font-size: 13.5px;
  padding: 10px 16px;
  border-radius: 100px;
  transition: transform 0.15s ease;
}
.download-btn:hover{ transform: translateY(-1px); }

/* error */
.error-block{
  margin-top: 20px;
  font-size: 13.5px;
  color: #ff9b9b;
  background: rgba(255,90,90,0.08);
  border: 1px solid rgba(255,90,90,0.2);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
}

/* steps */
.steps{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding-bottom: 80px;
}
.step{
  border-top: 1px solid var(--line-soft);
  padding-top: 16px;
}
.step-index{
  display: block;
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 13px;
  color: var(--ink-faint);
  margin-bottom: 8px;
}
.step-text{
  margin: 0;
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--ink-dim);
}

/* footer */
.foot{
  position: relative;
  z-index: 2;
  border-top: 1px solid var(--line-soft);
  padding: 22px 0 40px;
}
.foot .wrap{
  display: flex;
  justify-content: space-between;
  font-size: 12.5px;
  color: var(--ink-faint);
}
.foot span:first-child{
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  color: var(--ink-dim);
}

@media (max-width: 640px){
  .steps{ grid-template-columns: 1fr; gap: 22px; }
  .hero{ padding-top: 56px; }
  .result-block{ flex-wrap: wrap; }
  .download-btn{ width: 100%; justify-content: center; }
}