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

:root {
  --bg: #0d1117;
  --surface: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --accent: #58a6ff;
  --danger: #f85149;
  --success: #3fb950;
  --hover: #1f2937;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* Header */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left { display: flex; align-items: center; gap: 1rem; min-width: 0; }
.header-right { display: flex; align-items: center; gap: 0.75rem; flex-shrink: 0; }

.logo {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  white-space: nowrap;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.9rem;
  overflow-x: auto;
  white-space: nowrap;
}
.breadcrumbs a { color: var(--accent); text-decoration: none; }
.breadcrumbs a:hover { text-decoration: underline; }
.breadcrumbs .sep { color: var(--text-dim); }
.breadcrumbs .current { color: var(--text); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text);
  font-size: 0.85rem;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.15s;
}
.btn:hover { background: var(--hover); }
.btn-sm { padding: 0.2rem 0.5rem; font-size: 0.8rem; }
.btn-secondary { color: var(--text-dim); }
.btn-danger { color: var(--danger); }
.btn-danger:hover { background: rgba(248, 81, 73, 0.15); }

/* Toolbar */
.toolbar {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--border);
}

/* Panels */
.panel {
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.panel form { display: flex; align-items: center; gap: 0.5rem; }
.panel input[type="text"], .panel input[type="file"] {
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.85rem;
}

/* File list */
.file-list { padding: 0; }
.file-list table { width: 100%; border-collapse: collapse; }
.file-list th {
  text-align: left;
  padding: 0.5rem 1.25rem;
  font-size: 0.8rem;
  color: var(--text-dim);
  border-bottom: 1px solid var(--border);
  font-weight: 500;
}
.file-list td {
  padding: 0.45rem 1.25rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.875rem;
}
.file-list tr:hover { background: var(--hover); }

.col-name { width: 50%; }
.col-size { width: 15%; color: var(--text-dim); }
.col-date { width: 20%; color: var(--text-dim); font-size: 0.8rem; }
.col-actions { width: 15%; text-align: right; white-space: nowrap; }
.col-actions .btn { margin-left: 0.25rem; }

.entry {
  text-decoration: none;
  color: var(--text);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.entry:hover { color: var(--accent); }
.entry.dir { color: var(--accent); }
.entry .icon { font-size: 1rem; }

.empty {
  text-align: center;
  padding: 3rem;
  color: var(--text-dim);
}

/* Editor */
.editor-main {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 52px);
}
#editor {
  flex: 1;
  width: 100%;
  padding: 1rem 1.25rem;
  border: none;
  outline: none;
  background: var(--bg);
  color: var(--text);
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 0.875rem;
  line-height: 1.6;
  resize: none;
  tab-size: 2;
}

#save-status {
  font-size: 0.8rem;
  padding: 0.2rem 0.5rem;
}
#save-status.unsaved { color: #d29922; }
#save-status.saved { color: var(--success); }
#save-status.error { color: var(--danger); }

/* Login */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}
.login-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2.5rem;
  width: 100%;
  max-width: 360px;
}
.login-box h1 {
  text-align: center;
  font-size: 1.3rem;
  margin-bottom: 1.5rem;
  color: var(--accent);
}
.login-box form { display: flex; flex-direction: column; gap: 1rem; }
.login-box input {
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.95rem;
}
.login-box button {
  padding: 0.65rem;
  border: none;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font-size: 0.95rem;
  cursor: pointer;
  font-weight: 500;
}
.login-box button:hover { opacity: 0.9; }
.error {
  color: var(--danger);
  text-align: center;
  font-size: 0.85rem;
}

/* Error page */
.error-page {
  text-align: center;
  padding: 4rem 2rem;
}
.error-page h2 { margin-bottom: 1rem; }
.error-page p { color: var(--text-dim); margin-bottom: 2rem; }

/* Drop overlay */
.drop-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(88, 166, 255, 0.1);
  border: 3px dashed var(--accent);
  z-index: 999;
  font-size: 1.5rem;
  color: var(--accent);
  justify-content: center;
  align-items: center;
}
.drop-overlay.active { display: flex; }

/* Responsive */
@media (max-width: 768px) {
  .col-date { display: none; }
  .col-size { display: none; }
  .col-name { width: 70%; }
  .col-actions { width: 30%; }
  header { flex-wrap: wrap; gap: 0.5rem; }
  .header-right { width: 100%; justify-content: flex-end; }
  .breadcrumbs { font-size: 0.8rem; }
}