:root {
  --bg: #0f0f12;
  --surface: #18181d;
  --surface-hover: #1f1f26;
  --border: #2a2a32;
  --text: #e8e8ed;
  --text-muted: #8b8b98;
  --accent: #e8a64c;
  --accent-hover: #f0b85c;
  --success: #5cb85c;
  --radius: 12px;
  --font: "Commissioner", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  display: flex;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.header {
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--border);
}

.title {
  margin: 0;
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.tagline {
  margin: 0.5rem 0 0;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.main {
  flex: 1;
  padding: 2rem 0 3rem;
}

.loading,
.error {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
}

.error {
  color: #d66;
  background: rgba(214, 102, 102, 0.08);
  border-radius: var(--radius);
  border: 1px solid rgba(214, 102, 102, 0.3);
}

.error[hidden] {
  display: none !important;
}

.categories {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.category {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.category-header {
  width: 100%;
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  transition: background 0.15s ease;
}

.category-header:hover {
  background: var(--surface-hover);
}

.category-header .icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  color: var(--accent);
  transition: transform 0.2s ease;
}

.category.open .category-header .icon {
  transform: rotate(90deg);
}

.category-files {
  display: none;
  padding: 0 1.25rem 1rem;
  border-top: 1px solid var(--border);
}

.category.open .category-files {
  display: block;
  padding-top: 1rem;
}

.file-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.65rem 0.85rem;
  background: var(--bg);
  border-radius: 8px;
  border: 1px solid var(--border);
}

.file-name {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text);
  word-break: break-word;
}

.download-btn {
  flex-shrink: 0;
  padding: 0.45rem 0.9rem;
  font-family: var(--font);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--bg);
  background: var(--accent);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s ease, transform 0.1s ease;
}

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

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

.footer {
  padding: 1.25rem 0;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--text-muted);
}

@media (max-width: 480px) {
  .header {
    padding: 1.75rem 0;
  }
  .title {
    font-size: 1.5rem;
  }
  .category-header {
    padding: 0.9rem 1rem;
  }
  .file-item {
    flex-wrap: wrap;
  }
  .download-btn {
    width: 100%;
    text-align: center;
  }
}