:root {
  --bg: #0b0f19;
  --card-bg: #111827;
  --card-hover: #1f2937;
  --border: #1f2937;
  --border-hover: #374151;
  --text: #f3f4f6;
  --muted: #9ca3af;
  --accent: #ffd21e;
  --accent-hover: #facc15;
  --accent-text: #000000;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  padding: 1rem;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

header {
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-title {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
}

.brand-tag {
  font-size: 0.65rem;
  font-weight: 600;
  padding: 0.1rem 0.4rem;
  background: var(--accent);
  color: var(--accent-text);
  border-radius: 4px;
  text-transform: uppercase;
}

.search-box {
  position: relative;
  flex: 1;
}

.search-input {
  width: 100%;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.4rem 0.6rem 0.4rem 2rem;
  color: var(--text);
  font-family: inherit;
  font-size: 0.8rem;
  outline: none;
  transition: border-color 0.15s ease;
}

.search-input:focus {
  border-color: var(--accent);
}

.search-icon {
  position: absolute;
  left: 0.6rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  pointer-events: none;
}

.tree-node {
  margin-left: 0.75rem;
  border-left: 1px solid var(--border);
  padding-left: 0.35rem;
}

#tree > .tree-node {
  margin-left: 0;
  border-left: none;
  padding-left: 0;
}

.tree-header {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.5rem;
  margin: 0.1rem 0;
  cursor: pointer;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 500;
  user-select: none;
  transition: all 0.15s ease;
}

.tree-header:hover {
  background: var(--card-hover);
  border-color: var(--border-hover);
}

.tree-header .node-title {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.icon-toggle {
  width: 12px;
  height: 12px;
  color: var(--muted);
  transition: transform 0.15s ease;
  flex-shrink: 0;
}

.open > .tree-header > .icon-toggle {
  transform: rotate(90deg);
  color: var(--accent);
}

.tree-content {
  display: none;
}

.open > .tree-content {
  display: block;
}

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.2rem 0.5rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  margin: 0.1rem 0;
  gap: 0.5rem;
  height: 32px;
}

.file-item:hover {
  border-color: var(--border-hover);
}

.file-name {
  font-size: 0.775rem;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  min-width: 0;
}

.file-right-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.file-meta-inline {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.725rem;
  color: var(--muted);
  white-space: nowrap;
}

.file-author {
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.badge {
  background: #1f2937;
  padding: 0.05rem 0.35rem;
  border-radius: 3px;
  border: 1px solid var(--border);
  color: #e5e7eb;
  font-size: 0.7rem;
  font-weight: 500;
  min-width: 60px;
  text-align: center;
}

.file-actions {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.15rem 0.45rem;
  font-size: 0.725rem;
  font-weight: 500;
  font-family: inherit;
  color: var(--text);
  background: #1f2937;
  border: 1px solid var(--border);
  border-radius: 4px;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  height: 24px;
  transition: all 0.15s ease;
}

.btn:hover {
  background: #374151;
  border-color: var(--border-hover);
}

.btn-header {
  height: 28px;
  padding: 0 0.6rem;
  font-size: 0.75rem;
}

.btn-rss {
  color: #f97316;
  border-color: rgba(249, 115, 22, 0.3);
}

.btn-rss:hover {
  background: rgba(249, 115, 22, 0.1);
  border-color: #f97316;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
  font-weight: 600;
}

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

.loading, .empty {
  color: var(--muted);
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
}

svg {
  vertical-align: middle;
}

@media (max-width: 640px) {
  body { padding: 0.5rem; }
  .file-author { display: none; }
  .btn-text-full { display: none; }
  .tree-node { margin-left: 0.3rem; padding-left: 0.3rem; }
}