:root {
  --ptm-primary: #1d4ed8;
  --ptm-primary-hover: #1e40af;
  --ptm-bg: #f8fafc;
  --ptm-card: #ffffff;
  --ptm-text: #0f172a;
  --ptm-muted: #64748b;
  --ptm-border: #e2e8f0;
  --ptm-error: #dc2626;
  --ptm-success: #16a34a;
  --ptm-radius: 8px;
}

* { box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  margin: 0;
  padding: 32px 16px;
  background: var(--ptm-bg);
  color: var(--ptm-text);
}

.card {
  max-width: 640px;
  margin: 0 auto;
  background: var(--ptm-card);
  border: 1px solid var(--ptm-border);
  border-radius: var(--ptm-radius);
  padding: 28px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.brand {
  font-weight: 700;
  color: var(--ptm-primary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 12px;
  margin-bottom: 6px;
}

h1 {
  margin: 0 0 4px 0;
  font-size: 22px;
}

.muted { color: var(--ptm-muted); margin: 0; font-size: 14px; }
.hidden { display: none !important; }

.dropzone {
  margin: 20px 0;
  border: 2px dashed var(--ptm-border);
  border-radius: var(--ptm-radius);
  padding: 40px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.dropzone:hover,
.dropzone.dragover {
  border-color: var(--ptm-primary);
  background: rgba(29, 78, 216, 0.04);
}
.dropzone strong { font-size: 16px; }

button {
  font: inherit;
  cursor: pointer;
}
#browse {
  background: none;
  border: none;
  color: var(--ptm-primary);
  text-decoration: underline;
  padding: 0;
}
.btn-secondary {
  background: white;
  border: 1px solid var(--ptm-border);
  border-radius: var(--ptm-radius);
  padding: 8px 14px;
  color: var(--ptm-text);
}

.progress {
  background: var(--ptm-border);
  border-radius: 4px;
  height: 6px;
  overflow: hidden;
  margin-bottom: 6px;
}
#progress-bar {
  background: var(--ptm-primary);
  height: 100%;
  width: 0%;
  transition: width 0.2s ease;
}

.error {
  margin-top: 12px;
  padding: 12px 16px;
  background: rgba(220, 38, 38, 0.08);
  border: 1px solid rgba(220, 38, 38, 0.3);
  border-radius: var(--ptm-radius);
  color: var(--ptm-error);
}
.success {
  margin-top: 12px;
  padding: 12px 16px;
  background: rgba(22, 163, 74, 0.08);
  border: 1px solid rgba(22, 163, 74, 0.3);
  border-radius: var(--ptm-radius);
  color: var(--ptm-success);
}

footer {
  margin-top: 16px;
  display: flex;
  justify-content: flex-end;
}