:root {
  color-scheme: dark;
  --bg: #020617;
  --panel: rgba(15, 23, 42, 0.88);
  --panel-border: rgba(148, 163, 184, 0.18);
  --text: #e5eefb;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --accent-strong: #0ea5e9;
  --success: #22c55e;
  --danger: #f87171;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(56, 189, 248, 0.2), transparent 35%),
    linear-gradient(180deg, #0f172a 0%, var(--bg) 100%);
}
.page {
  width: min(960px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 4rem 0;
}
.hero { margin-bottom: 2rem; }
.eyebrow {
  margin: 0 0 .75rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: .16em;
  font-size: .82rem;
}
h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 3.6rem);
  line-height: 1.05;
}
.lead {
  margin: 1rem 0 0;
  color: var(--muted);
  max-width: 44rem;
  font-size: 1.05rem;
}
.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 24px;
  padding: 1.25rem;
  backdrop-filter: blur(18px);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.35);
}
.dropzone {
  width: 100%;
  border: 2px dashed rgba(56, 189, 248, 0.45);
  border-radius: 20px;
  background: rgba(15, 23, 42, 0.7);
  color: var(--text);
  padding: 3.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: .6rem;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform .15s ease, border-color .15s ease, background .15s ease;
}
.dropzone:hover, .dropzone.is-dragover {
  transform: translateY(-1px);
  border-color: var(--accent);
  background: rgba(14, 165, 233, 0.12);
}
.dropzone-title { font-size: 1.35rem; font-weight: 700; }
.dropzone-subtitle, .dropzone-meta { color: var(--muted); }
.status {
  margin-top: 1rem;
  padding: .95rem 1rem;
  border-radius: 14px;
  background: rgba(15, 23, 42, 0.75);
  border: 1px solid rgba(148, 163, 184, 0.15);
}
.status.success { color: #dcfce7; border-color: rgba(34, 197, 94, 0.45); background: rgba(20, 83, 45, 0.35); }
.status.error { color: #fee2e2; border-color: rgba(248, 113, 113, 0.45); background: rgba(127, 29, 29, 0.32); }
.status.loading { color: #e0f2fe; border-color: rgba(56, 189, 248, 0.45); background: rgba(8, 47, 73, 0.42); }
.muted { color: var(--muted); }
.download-link {
  display: inline-flex;
  margin-top: 1rem;
  padding: .9rem 1.1rem;
  border-radius: 14px;
  text-decoration: none;
  color: white;
  background: linear-gradient(135deg, var(--accent-strong), var(--accent));
  font-weight: 700;
}
.hidden { display: none; }
@media (max-width: 640px) {
  .page { padding: 2rem 0; }
  .dropzone { padding: 2.5rem 1rem; }
}