:root {
  --bg: #f7f7f5;
  --surface: #ffffff;
  --text: #1a1a1a;
  --text2: #55555a;
  --border: #dcdcd8;
  --accent: #1f6f54;
  --accent-hover: #185a44;
  --error: #b3261e;
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16171a;
    --surface: #202126;
    --text: #f0f0ee;
    --text2: #b7b8bd;
    --border: #34353b;
    --accent: #4fd1a5;
    --accent-hover: #6fe0b8;
    --error: #ff6b60;
  }
}

* { box-sizing: border-box; }

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

.wrap {
  max-width: 640px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

.head h1 {
  font-size: 1.9rem;
  margin: 0 0 0.4rem;
}

.tagline {
  color: var(--text2);
  margin: 0 0 0.5rem;
}

.usage-count {
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 500;
  margin: 0 0 1.5rem;
}

.trust {
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  border-radius: var(--radius);
  padding: 0.9rem 1.1rem;
  margin-bottom: 1.5rem;
  font-size: 0.92rem;
}

.trust p { margin: 0; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2rem 1rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.dropzone:hover,
.dropzone:focus-visible,
.dropzone.dragover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 6%, transparent);
  outline: none;
}

.dropzone .or {
  color: var(--text2);
  font-size: 0.85rem;
}

#browse-btn,
#process-btn {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.6rem 1.2rem;
  font-size: 0.95rem;
  cursor: pointer;
  margin-top: 0.75rem;
}

#browse-btn:hover,
#process-btn:hover:not(:disabled) {
  background: var(--accent-hover);
}

#process-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.filename {
  margin-top: 0.75rem;
  font-size: 0.9rem;
  color: var(--text2);
  word-break: break-all;
}

.options {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.9rem;
}

.field input[type="number"] {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  padding: 0.5rem 0.6rem;
  font-size: 1rem;
  width: 10rem;
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.progress {
  position: relative;
  height: 1.6rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width 0.1s linear;
}

.progress-label {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  color: var(--text);
  mix-blend-mode: difference;
}

.header-preview {
  margin: -0.5rem 0 0;
  font-size: 0.82rem;
  color: var(--text2);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.5rem 0.65rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  overflow-x: auto;
  white-space: nowrap;
}

.header-preview strong {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  display: block;
  margin-bottom: 0.2rem;
  font-weight: 600;
}

.result {
  color: var(--accent);
  font-weight: 500;
}

.error {
  color: var(--error);
}

.foot {
  margin-top: 2.5rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text2);
}