:root {
  --bg: #09090b;
  --panel: #15151a;
  --panel-2: #1e1e24;
  --ink: #f7f7f8;
  --ink-dim: #a7a7ad;
  --accent: #f51f4c;
  --accent-2: #26d9d0;
  --accent-ink: #ffffff;
  --ghost: #3f4049;
  --ok: #39d98a;
  --err: #ff6262;
  --radius: 8px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: #09090b;
  color: var(--ink);
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    linear-gradient(120deg, rgba(245,31,76,.18), transparent 42%),
    linear-gradient(280deg, rgba(38,217,208,.12), transparent 45%),
    var(--bg);
  pointer-events: none;
}

a { color: var(--accent-2); }

main {
  position: relative;
  max-width: 920px;
  margin: 0 auto;
  padding: 30px 24px 64px;
}

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid rgba(255,255,255,.08);
  background: #111116;
}

.hero-inner {
  position: relative;
  max-width: 920px;
  margin: 0 auto;
  padding: 42px 24px 52px;
}

h1 {
  margin: 0;
  max-width: 760px;
  font-size: 2.25rem;
  letter-spacing: 0;
  line-height: 1.08;
  text-shadow: 0 2px 18px rgba(0,0,0,.55);
}

code, kbd {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  background: rgba(255,255,255,.07);
  padding: 1px 6px;
  border-radius: 5px;
  font-size: .92em;
}

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

.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: 142px;
  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: 6px;
  letter-spacing: .02em;
}

.hint { color: var(--ink-dim); font-size: .92rem; }

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

.dropzone.ready .file-name { opacity: 1; }

.hash-warning {
  margin: 0 0 20px;
}

.hash-warning p {
  margin: 0;
  padding: 14px 16px;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 98, 98, 0.45);
  background: rgba(255, 98, 98, 0.11);
  color: var(--ink-dim);
  font-size: 0.95rem;
  line-height: 1.5;
}

.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: .42; cursor: not-allowed; }

.progress {
  background: var(--panel);
  border-radius: var(--radius);
  padding: 14px 16px;
  border: 1px solid rgba(255,255,255,.08);
}

.bar {
  position: relative;
  height: 8px;
  border-radius: 999px;
  background: rgba(255,255,255,.09);
  overflow: hidden;
}

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

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

.log {
  background: #08080c;
  border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--radius);
  padding: 14px 16px;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, 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: #ffbd59; }

.howto {
  background: var(--panel);
  border: 1px solid rgba(255,255,255,.08);
  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 p {
  color: var(--ink-dim);
  line-height: 1.58;
}

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

footer a { color: var(--ink-dim); }

@media (max-width: 680px) {
  main { padding: 24px 18px 52px; }
  .hero-inner { padding: 32px 18px 40px; }
  h1 { font-size: 1.85rem; }
  .howto { padding: 20px; }
}