:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #252836;
  --border: #2d3148;
  --text: #e2e8f0;
  --muted: #64748b;
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --success: #22c55e;
  --error: #ef4444;
  --radius: 10px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 3rem 1rem;
}

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

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

.logo {
  height: 336px;
  width: auto;
  margin-bottom: 1rem;
  display: block;
  margin-left: auto;
  margin-right: auto;
  border-radius: 15px;
}

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

.subtitle {
  color: var(--muted);
  margin-top: 0.4rem;
  font-size: 0.95rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

input[type="file"],
input[type="number"] {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 0.6rem 0.75rem;
  font-size: 0.95rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s;
}

input[type="file"]:focus,
input[type="number"]:focus {
  border-color: var(--accent);
}

input[type="number"] {
  -moz-appearance: textfield;
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  opacity: 1;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1.5rem;
  cursor: pointer;
}

.checkbox-row input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
}

.checkbox-row span {
  font-size: 0.95rem;
}

.btn {
  display: block;
  width: 100%;
  padding: 0.75rem 1.5rem;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  transition: background 0.15s;
}

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

.progress-wrap {
  background: var(--surface2);
  border-radius: 99px;
  height: 8px;
  overflow: hidden;
  margin-bottom: 0.75rem;
}

.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 99px;
  transition: width 0.3s ease;
}

.status-msg {
  color: var(--muted);
  font-size: 0.9rem;
}

.done-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--success);
  margin-bottom: 1rem;
}

.error-msg {
  color: var(--error);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
}

.file-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.file-list li a {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.6rem 0.75rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
  font-family: monospace;
  transition: border-color 0.15s;
}

.file-list li a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.file-list li a::before {
  content: "↓";
  font-family: var(--font);
  font-size: 0.85rem;
  color: var(--muted);
}

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1.5rem 0;
}