:root {
  --bg: #0b0d12;
  --panel: #141923;
  --panel-2: #10151d;
  --line: rgba(255, 255, 255, 0.08);
  --text: #f4f7fb;
  --muted: #9ba6ba;
  --accent: #7c9cff;
  --accent-2: #9f7cff;
  --success: #7be0a5;
  --danger: #ff8f8f;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  min-height: 100vh;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top, rgba(124, 156, 255, 0.18), transparent 32%),
    radial-gradient(circle at right, rgba(159, 124, 255, 0.16), transparent 22%),
    var(--bg);
  color: var(--text);
}

.shell {
  width: min(1120px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 32px 0 56px;
  display: grid;
  gap: 20px;
}

.panel {
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: var(--shadow);
  padding: 28px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.6rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lead {
  max-width: 760px;
  margin: 14px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.search-row {
  margin-top: 22px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
}

input,
button {
  border: 0;
  outline: 0;
  font: inherit;
}

input {
  min-width: 0;
  background: #0e131b;
  color: var(--text);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 18px;
  padding: 16px 18px;
}

input::placeholder { color: #6f7b91; }

button {
  border-radius: 18px;
  padding: 16px 18px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 120ms ease, opacity 120ms ease, background 120ms ease;
}

button:hover { transform: translateY(-1px); }
button:active { transform: translateY(0); }
button:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }

#submit-button,
#download-button {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
}

.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid rgba(255,255,255,0.12);
}

.hint-row {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.hint-row span {
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,0.05);
  color: var(--muted);
  font-size: 0.92rem;
}

.status {
  margin: 0;
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(255,255,255,0.05);
  color: var(--muted);
  line-height: 1.5;
}

.status.success { color: var(--success); }
.status.error { color: var(--danger); }
.status.loading { color: var(--accent); }

.meta-grid {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.meta-grid > div {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 14px 16px;
  background: var(--panel-2);
}

.meta-label {
  color: var(--muted);
  font-size: 0.88rem;
  margin-bottom: 6px;
}

.meta-value {
  font-weight: 700;
  word-break: break-all;
}

.preview-grid {
  margin-top: 20px;
}

.preview-card {
  border: 1px solid var(--line);
  background: var(--panel-2);
  border-radius: 22px;
  padding: 18px;
}

.preview-title {
  margin-bottom: 12px;
  font-size: 1rem;
  font-weight: 700;
}

.checkerboard {
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.08);
  background:
    linear-gradient(45deg, rgba(255,255,255,0.06) 25%, transparent 25%) -12px 0/24px 24px,
    linear-gradient(-45deg, rgba(255,255,255,0.06) 25%, transparent 25%) -12px 0/24px 24px,
    linear-gradient(45deg, transparent 75%, rgba(255,255,255,0.06) 75%) -12px 0/24px 24px,
    linear-gradient(-45deg, transparent 75%, rgba(255,255,255,0.06) 75%) -12px 0/24px 24px,
    #0d1118;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.action-row {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 720px) {
  .shell {
    width: min(100vw - 20px, 1120px);
    padding-top: 18px;
    padding-bottom: 28px;
  }

  .panel {
    padding: 18px;
    border-radius: 22px;
  }

  .search-row {
    grid-template-columns: 1fr;
  }

  .meta-grid {
    grid-template-columns: 1fr;
  }

  .action-row > button {
    flex: 1 1 100%;
  }
}