:root {
  --bg: #0b0c10;
  --panel: #15171f;
  --panel-2: #1c1f2a;
  --ink: #f4f4f5;
  --ink-dim: #a0a3ad;
  --accent: #ffcc00;
  --accent-ink: #1a1a1a;
  --ghost: #3a3d48;
  --ok: #39d98a;
  --err: #ff5c5c;
  --radius: 14px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: radial-gradient(1200px 600px at 15% -10%, #1a1d2b 0%, var(--bg) 55%) fixed;
  color: var(--ink);
  min-height: 100vh;
}

main {
  max-width: 920px;
  margin: 0 auto;
  padding: 32px 24px 64px;
}

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid rgba(255,255,255,.06);
}

.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: .22;
  filter: saturate(1.1) contrast(1.05);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  max-width: 920px;
  margin: 0 auto;
  padding: 40px 24px 48px;
  display: flex;
  gap: 24px;
  align-items: center;
}

.titles h1 {
  margin: 0;
  font-size: 2.1rem;
  letter-spacing: -.01em;
}

code, kbd {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  background: rgba(255,255,255,.06);
  padding: 1px 6px;
  border-radius: 5px;
  font-size: .92em;
}

kbd {
  border: 1px solid rgba(255,255,255,.15);
  box-shadow: inset 0 -1px 0 rgba(255,255,255,.08);
}

.picker {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 22px 0;
}

.hash-warning {
  max-width: 920px;
  margin: 0 auto 20px;
  padding: 0 24px;
}

.hash-warning p {
  margin: 0;
  padding: 14px 16px;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 92, 92, 0.45);
  background: rgba(255, 92, 92, 0.1);
  color: var(--ink-dim);
  font-size: 0.95rem;
  line-height: 1.5;
}

.hash-warning a {
  color: var(--accent);
}

.hash-warning a:hover {
  text-decoration: underline;
}

@media (max-width: 680px) {
  .picker { grid-template-columns: 1fr; }
  .hero-inner { flex-direction: column; text-align: center; padding: 28px 20px 32px; }
}

.dropzone {
  background: var(--panel);
  border: 1.5px dashed var(--ghost);
  border-radius: var(--radius);
  padding: 24px;
  cursor: pointer;
  transition: border-color .15s, background .15s, transform .05s;
  min-height: 148px;
  display: flex;
  align-items: center;
}

.dropzone:hover { border-color: var(--accent); background: var(--panel-2); }
.dropzone.drag { border-color: var(--accent); background: var(--panel-2); transform: scale(1.01); }
.dropzone.ready { border-style: solid; border-color: var(--ok); }

.drop-label {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
}

.slot {
  display: inline-block;
  align-self: flex-start;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 3px 10px;
  font-size: .78rem;
  font-weight: 700;
  border-radius: 999px;
  letter-spacing: .02em;
}

.hint { color: var(--ink-dim); font-size: .92rem; }
.file-name {
  color: var(--ink);
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: .9rem;
  word-break: break-all;
  opacity: .6;
}
.dropzone.ready .file-name { opacity: 1; }

.actions {
  margin: 8px 0 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

button#build-btn {
  background: var(--accent);
  color: var(--accent-ink);
  border: none;
  font-size: 1.05rem;
  font-weight: 700;
  padding: 14px 20px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: opacity .15s, transform .05s;
}

button#build-btn:hover:not(:disabled) { transform: translateY(-1px); }
button#build-btn:disabled { opacity: .4; cursor: not-allowed; }

.progress {
  background: var(--panel);
  border-radius: var(--radius);
  padding: 14px 16px;
  border: 1px solid rgba(255,255,255,.06);
}

.bar {
  position: relative;
  height: 8px;
  border-radius: 999px;
  background: rgba(255,255,255,.08);
  overflow: hidden;
}

.bar::after {
  content: "";
  position: absolute;
  inset: 0;
  width: var(--pct, 0%);
  background: linear-gradient(90deg, var(--accent), #ffdd55);
  transition: width .2s;
}

.status {
  margin-top: 10px;
  font-size: .9rem;
  color: var(--ink-dim);
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
}

.log {
  background: #0a0b11;
  border: 1px solid rgba(255,255,255,.06);
  border-radius: var(--radius);
  padding: 14px 16px;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: .82rem;
  max-height: 220px;
  overflow-y: auto;
  white-space: pre-wrap;
  color: var(--ink-dim);
}
.log .ok { color: var(--ok); }
.log .err { color: var(--err); }
.log .warn { color: #ffb347; }

.howto {
  background: var(--panel);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: var(--radius);
  padding: 22px 26px;
  margin-top: 8px;
}
.howto h2 { margin-top: 0; font-size: 1.25rem; }
.howto ol { padding-left: 22px; line-height: 1.7; }
.howto ul { padding-left: 20px; }

footer {
  text-align: center;
  color: var(--ink-dim);
  font-size: .85rem;
  margin-top: 36px;
}
footer a { color: var(--ink-dim); }