*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0f0f0f;
  --surface: #1a1a1a;
  --surface-2: #242424;
  --accent: #7c3aed;
  --accent-hover: #6d28d9;
  --accent-light: rgba(124, 58, 237, 0.15);
  --text: #e5e5e5;
  --text-muted: #888;
  --border: #2e2e2e;
  --border-dashed: #3a3a3a;
  --success: #22c55e;
  --error: #ef4444;
  --radius: 12px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 40px 16px 80px;
}

.container {
  width: 100%;
  max-width: 560px;
}

/* Header */
header {
  text-align: center;
  margin-bottom: 40px;
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #fff;
}

.subtitle {
  color: var(--text-muted);
  margin-top: 6px;
  font-size: 0.95rem;
}

/* Form */
.upload-group {
  margin-bottom: 24px;
}

.upload-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.required {
  color: var(--accent);
}

.optional {
  color: var(--text-muted);
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  font-size: 0.8rem;
}

/* Upload Zone */
.upload-zone {
  background: var(--surface);
  border: 2px dashed var(--border-dashed);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  position: relative;
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--accent);
  background: var(--accent-light);
}

.upload-zone.has-file {
  border-color: var(--accent);
  border-style: solid;
}

.upload-icon {
  font-size: 2rem;
  margin-bottom: 8px;
}

.upload-label {
  color: var(--text);
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.upload-label .link {
  color: var(--accent);
  text-decoration: underline;
  cursor: pointer;
}

.upload-hint {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.file-name {
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 500;
  word-break: break-all;
}

/* Buttons */
.btn-primary {
  display: block;
  width: 100%;
  padding: 14px 24px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  margin-top: 8px;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* Status Section */
#statusSection {
  margin-top: 36px;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 28px 24px;
  border: 1px solid var(--border);
}

.job-id-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  font-size: 0.85rem;
}

.job-label {
  color: var(--text-muted);
  font-weight: 600;
}

code {
  background: var(--surface-2);
  color: var(--text-muted);
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-family: 'SF Mono', 'Fira Code', monospace;
  word-break: break-all;
}

/* Steps */
.steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin-bottom: 28px;
}

.step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.step-dot {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--border);
  border: 2px solid var(--border-dashed);
  display: block;
  transition: background 0.3s, border-color 0.3s;
}

.step.active .step-dot {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 10px rgba(124, 58, 237, 0.5);
}

.step.complete .step-dot {
  background: var(--success);
  border-color: var(--success);
}

.step-text {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
  font-weight: 500;
  transition: color 0.3s;
}

.step.active .step-text,
.step.complete .step-text {
  color: var(--text);
}

.step-connector {
  flex: 1;
  height: 2px;
  background: var(--border);
  margin: 0 8px;
  margin-bottom: 22px;
  transition: background 0.3s;
  max-width: 80px;
}

.step-connector.complete {
  background: var(--success);
}

/* Spinner */
.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 16px;
}

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

/* Error */
.error-message {
  color: var(--error);
  font-size: 0.9rem;
  text-align: center;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.25);
  border-radius: 8px;
  padding: 12px 16px;
}

/* Download Button */
.btn-download {
  display: block;
  width: 100%;
  padding: 14px 24px;
  background: var(--success);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  transition: opacity 0.2s, transform 0.1s;
  margin-top: 4px;
}

.btn-download:hover {
  opacity: 0.9;
}

.btn-download:active {
  transform: scale(0.98);
}

/* Utilities */
.hidden {
  display: none !important;
}