* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: #1f2937;
  background:
    radial-gradient(900px 500px at 20% -10%, #d8e6ff 0%, transparent 60%),
    radial-gradient(800px 450px at 95% 0%, #d8fff1 0%, transparent 58%),
    #f7f9ff;
}

.page {
  width: min(1080px, 100%);
  margin: 0 auto;
  padding: 1.5rem 1rem 2.5rem;
}

.hero {
  margin-bottom: 1.25rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  background: #eaedff;
  color: #4f46e5;
  padding: 0.35rem 0.8rem;
  font-size: 0.8rem;
  font-weight: 700;
}

h1 {
  margin: 0.8rem 0 0.45rem;
  font-size: clamp(1.5rem, 2.8vw, 2.15rem);
  line-height: 1.2;
}

.hero p {
  margin: 0;
  color: #4b5563;
}

.panel {
  border: 1px solid #e7eaf8;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 12px 30px rgba(99, 102, 241, 0.08);
  padding: 1rem;
  margin-bottom: 1rem;
}

.form-grid {
  display: grid;
  gap: 1rem;
}

.drop-zone {
  display: grid;
  gap: 0.45rem;
  border: 2px dashed #cfd7ff;
  border-radius: 18px;
  padding: 1rem;
  background: #f6f8ff;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.drop-zone.drag-over {
  border-color: #6366f1;
  background: #eef1ff;
}

#file-input {
  display: none;
}

.drop-title {
  font-weight: 700;
}

.drop-subtitle,
.selected-file {
  color: #6b7280;
  font-size: 0.9rem;
}

.option-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.field {
  display: grid;
  gap: 0.35rem;
}

.field span {
  font-size: 0.9rem;
  color: #4b5563;
}

input,
select,
button {
  border: 1px solid #d6dcf7;
  border-radius: 14px;
  font-size: 0.98rem;
  padding: 0.65rem 0.8rem;
  font-family: inherit;
}

input:focus,
select:focus,
button:focus {
  outline: 2px solid #c7d2fe;
  outline-offset: 1px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

#submit-btn {
  border-color: #4f46e5;
  background: #4f46e5;
  color: #ffffff;
  font-weight: 700;
}

#submit-btn:hover {
  background: #4338ca;
}

#download-btn {
  background: #f3f4f6;
  color: #111827;
}

#download-btn:disabled {
  cursor: not-allowed;
  color: #9ca3af;
}

.status-box {
  min-height: 2.5rem;
  border-radius: 14px;
  border: 1px solid #e5e7eb;
  background: #f9fafb;
  padding: 0.7rem 0.9rem;
  color: #374151;
  margin-bottom: 0.9rem;
}

.status-box.error {
  border-color: #fecaca;
  background: #fef2f2;
  color: #991b1b;
}

.status-box.success {
  border-color: #bbf7d0;
  background: #f0fdf4;
  color: #166534;
}

.preview-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
}

.preview-card {
  border: 1px solid #ecedf5;
  border-radius: 16px;
  padding: 0.8rem;
}

.preview-card h2 {
  margin: 0 0 0.65rem;
  font-size: 1rem;
}

.preview-frame {
  border-radius: 14px;
  background:
    linear-gradient(45deg, #eef2ff 25%, #f8fafc 25%, #f8fafc 50%, #eef2ff 50%, #eef2ff 75%, #f8fafc 75%);
  background-size: 20px 20px;
  border: 1px solid #e5e7eb;
  min-height: 180px;
  display: grid;
  place-items: center;
  overflow: hidden;
}

.preview-frame img {
  display: none;
  max-width: 100%;
  max-height: 300px;
}

.preview-frame img.ready {
  display: block;
}

.meta-panels {
  margin-top: 0.9rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.meta-panel {
  border: 1px solid #ecedf5;
  border-radius: 14px;
  padding: 0.75rem 0.85rem;
  background: #fbfcff;
}

.meta-panel h3 {
  margin: 0 0 0.55rem;
  font-size: 0.95rem;
  color: #374151;
}

.meta-list {
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.45rem;
}

.meta-list div {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  border-bottom: 1px dashed #e5e7eb;
  padding-bottom: 0.2rem;
  font-size: 0.9rem;
}

.meta-list dt {
  color: #6b7280;
}

.meta-list dd {
  margin: 0;
  font-weight: 600;
}

@media (min-width: 760px) {
  .page {
    padding: 2rem 1.5rem 3rem;
  }

  .panel {
    padding: 1.25rem;
  }

  .option-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .preview-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .meta-panels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}