:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --bg: #f4f6f9;
  --card-bg: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

header {
  background: var(--primary);
  color: #fff;
  padding: 1.2rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header h1 {
  margin: 0;
  font-size: 1.3rem;
}

header .logout {
  color: #fff;
  text-decoration: none;
  font-size: 0.9rem;
  opacity: 0.85;
}

header .logout:hover { opacity: 1; text-decoration: underline; }

main {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.login-box {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 2rem;
  max-width: 360px;
  margin: 3rem auto;
  text-align: center;
}

.login-box h2 { margin-top: 0; font-size: 1.1rem; }

.login-box form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1rem;
}

.login-box input[type="password"] {
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 1rem;
}

.login-box button {
  padding: 0.6rem 0.8rem;
  border: none;
  border-radius: 6px;
  background: var(--primary);
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
}

.login-box button:hover { background: var(--primary-dark); }

.error { color: #dc2626; font-size: 0.9rem; }

.folder {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.9rem 1.2rem;
  margin-bottom: 1rem;
}

.folder.depth-0 { margin-bottom: 1.5rem; }

.folder summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--primary-dark);
  list-style: none;
  padding: 0.2rem 0;
}

.folder.depth-0 > summary { font-size: 1.15rem; }

.folder summary::-webkit-details-marker { display: none; }

.folder summary::before {
  content: '▸';
  display: inline-block;
  margin-right: 0.4rem;
  transition: transform 0.15s ease;
  color: var(--muted);
}

.folder[open] > summary::before {
  transform: rotate(90deg);
}

.folder-body {
  margin-top: 0.6rem;
  padding-left: 0.4rem;
}

/* Verschachtelte Unterordner leicht einrücken und optisch abgrenzen */
.folder .folder {
  background: var(--bg);
  border-left: 3px solid var(--border);
  border-top: none;
  border-right: none;
  border-bottom: none;
  border-radius: 6px;
  margin-left: 0.3rem;
}

.file-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.file-list li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.file-list li:last-child { border-bottom: none; }

.icon { font-size: 1.3rem; }

.fname {
  flex: 1;
  min-width: 150px;
  font-weight: 500;
}

.fmeta {
  color: var(--muted);
  font-size: 0.85rem;
  white-space: nowrap;
}

.btn {
  background: var(--primary);
  color: #fff;
  text-decoration: none;
  padding: 0.4rem 0.9rem;
  border-radius: 6px;
  font-size: 0.9rem;
}

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

.empty {
  text-align: center;
  color: var(--muted);
  margin-top: 3rem;
}

footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
  margin: 2rem 0;
}