:root {
  --bg-color: #ffffff;
  --bg-subtle: #f8fafc;
  --bg-card: #ffffff;
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-subtle: #64748b;
  --brand-navy: #0f2042;
  --brand-blue: #003399;
  --brand-blue-hover: #002266;
  --border-color: #e2e8f0;
  --ok-color: #059669;
  --error-color: #dc2626;
  --warn-color: #b45309;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #0b1120;
    --bg-subtle: #0f172a;
    --bg-card: #182238;
    --text-main: #f8fafc;
    --text-muted: #cbd5e1;
    --text-subtle: #94a3b8;
    --brand-navy: #f8fafc;
    --brand-blue: #38bdf8;
    --brand-blue-hover: #7dd3fc;
    --border-color: #263349;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg-color);
  color: var(--text-main);
  line-height: 1.5;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

header a {
  color: var(--brand-blue);
  text-decoration: none;
  font-size: 0.9rem;
}

h1 {
  color: var(--brand-navy);
  font-size: 1.75rem;
  margin-bottom: 0.25rem;
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 0;
}

.banner {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--warn-color);
  border-radius: 8px;
  padding: 0.9rem 1.1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.75rem;
}

.dropzone {
  border: 2px dashed var(--border-color);
  border-radius: 12px;
  padding: 2.5rem 1.5rem;
  text-align: center;
  cursor: pointer;
  background: var(--bg-card);
  transition: border-color 0.15s, background 0.15s;
}

.dropzone.dragover {
  border-color: var(--brand-blue);
  background: var(--bg-subtle);
}

.dropzone input {
  display: none;
}

.dropzone .icon {
  font-size: 2rem;
  display: block;
  margin-bottom: 0.5rem;
}

.dropzone .hint {
  color: var(--text-subtle);
  font-size: 0.85rem;
  margin-top: 0.25rem;
}

.file-info {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  word-break: break-all;
}

.file-info code {
  background: var(--bg-subtle);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  font-size: 0.8rem;
}

button.primary {
  display: block;
  width: 100%;
  margin-top: 1.5rem;
  padding: 0.85rem;
  background: var(--brand-blue);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

button.primary:hover:not(:disabled) {
  background: var(--brand-blue-hover);
}

button.primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.result {
  margin-top: 1.75rem;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  overflow: hidden;
  display: none;
}

.result.visible {
  display: block;
}

.result-header {
  padding: 0.9rem 1.1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.result-header.ok {
  background: rgba(5, 150, 105, 0.1);
  color: var(--ok-color);
}

.result-header.error {
  background: rgba(220, 38, 38, 0.1);
  color: var(--error-color);
}

.result-body {
  padding: 1rem 1.1rem;
  background: var(--bg-card);
  font-size: 0.85rem;
}

.result-body dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.35rem 1rem;
  margin: 0;
}

.result-body dt {
  color: var(--text-subtle);
}

.result-body dd {
  margin: 0;
  word-break: break-all;
}

.actions {
  margin-top: 1rem;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

button.secondary {
  padding: 0.5rem 0.9rem;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: 6px;
  font-size: 0.85rem;
  cursor: pointer;
}

button.secondary:hover {
  border-color: var(--brand-blue);
  color: var(--brand-blue);
}

footer {
  text-align: center;
  margin-top: 3rem;
  font-size: 0.8rem;
  color: var(--text-subtle);
}

footer a {
  color: inherit;
}

.spinner {
  display: inline-block;
  width: 1em;
  height: 1em;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  vertical-align: -0.15em;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}