/* ===== THEME TOKENS ===== */
:root {
  --bg: #f5f5f5;
  --text: #111;
  --muted: #666;
  --card: #fff;
  --border: #ddd;
  --hover: #f9f9f9;
  --accent: #4285F4;
  --header-bg: var(--accent);
  --header-text: #fff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --card: #111827;
    --border: #1f2937;
    --hover: #0b1222;
    --header-bg: #111827;
    --header-text: #e5e7eb;
  }
}

/* Manual override via attribute */
html[data-theme="light"] {
  --bg: #f5f5f5;
  --text: #111;
  --muted: #666;
  --card: #fff;
  --border: #ddd;
  --hover: #f9f9f9;
  --header-bg: var(--accent);
  --header-text: #fff;
}

html[data-theme="dark"] {
  --bg: #0f172a;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --card: #111827;
  --border: #1f2937;
  --hover: #0b1222;
  --header-bg: #111827;
  --header-text: #e5e7eb;
}

/* ===== BASE ===== */
* {
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  transition: background .25s ease, color .25s ease;
}

header {
  background: var(--header-bg);
  color: var(--header-text);
  padding: 1rem;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  /* title left, toggle right */
}

/* Toggle button */
#theme-toggle {
  background: transparent;
  color: inherit;
  border: 1px solid color-mix(in oklch, var(--header-text), transparent 70%);
  padding: .4rem .6rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95rem;
}

#theme-toggle:hover {
  opacity: .9;
}

/* Layout */
main {
  display: flex;
  height: calc(100vh - 70px);
}

.sidebar {
  background: var(--card);
  width: 200px;
  border-right: 1px solid var(--border);
}

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

.sidebar li {
  padding: 10px 15px;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
}

.sidebar li:hover {
  background: var(--hover);
}

.content {
  flex: 1;
  padding: 20px;
}

.file-list {
  background: var(--card);
  border-radius: 5px;
  border: 1px solid var(--border);
  overflow: hidden;
}

.file-item {
  display: flex;
  align-items: center;
  padding: 10px;
  margin: 3px 0;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background .2s ease, color .2s ease;
}

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

.file-item img {
  width: 24px;
  height: 24px;
  margin-right: 15px;
  filter: none;
}

.file-name {
  flex: 1;
  color: var(--text);
}

/* ===== MOBILE ===== */
@media (max-width: 768px) {
  header {
    text-align: center;
  }

  main {
    flex-direction: column;
    height: auto;
  }

  .sidebar {
    width: 100%;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .sidebar ul {
    display: flex;
    justify-content: space-around;
  }

  .sidebar li {
    flex: 1;
    text-align: center;
    border-right: 1px solid var(--border);
    border-bottom: 0;
  }

  .sidebar li:last-child {
    border-right: 0;
  }

  .content {
    padding: 10px;
  }

  .file-item {
    padding: 12px;
  }
}

@media (max-width: 480px) {
  header {
    font-size: 1.2rem;
    padding: .8rem;
  }

  .file-item {
    padding: 10px;
    font-size: .95rem;
  }
}