:root {
  --bg: #0b0d10;
  --panel: #12151a;
  --text: #e7ecf3;
  --muted: #a8b3c2;
  --primary: #4f8cff;
  --primary-900: #2a6fff;
  --border: #1f2430;
  --success: #4ade80;
}

/* Light theme overrides */
:root.light-theme {
  --bg: #f7f8fa;
  --panel: #ffffff;
  --text: #0b0d10;
  --muted: #4b5563;
  --primary: #2563eb;
  --primary-900: #1e40af;
  --border: #e5e7eb;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font: 16px/1.5 system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Helvetica Neue, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1000px 500px at 10% -10%, #1a2030, transparent), var(--bg);
}

.container {
  width: min(960px, 92%);
  margin: 0 auto;
}

header {
  padding: 28px 0 8px;
}

header h1 {
  margin: 0 0 6px 0;
  font-size: 28px;
}

.tagline { color: var(--muted); margin: 0 0 12px 0; }

nav a {
  color: var(--muted);
  margin-right: 14px;
  text-decoration: none;
}
nav a:hover { color: var(--text); }

/* User preference: all links bold, per site preference */
nav a, a { font-weight: 700; }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  margin: 14px 0;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.row { display: flex; gap: 10px; align-items: center; }

input[type="text"], input:not([type]) {
  flex: 1;
  background: #0e1116;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
}

button {
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 10px;
  padding: 12px 16px;
  cursor: pointer;
}
button:hover { background: var(--primary-900); }
button.secondary { background: #2b3340; }
button.secondary:hover { background: #364052; }

/* Theme toggle specific style */
.theme-toggle {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  padding: 8px 12px;
}
.theme-toggle:hover { color: var(--text); }

.todos { list-style: none; padding: 0; margin: 12px 0; }
.todos li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  background: #0e1116;
  border-radius: 10px;
}
.todos li + li { margin-top: 8px; }
.todos li.completed .title { text-decoration: line-through; color: var(--muted); }
.todos .spacer { flex: 1; }
.todos .destroy { background: #3a4354; }
.todos .destroy:hover { background: #4a566e; }

/* Light theme list background to match panel */
.light-theme .todos li { background: var(--panel); }

.muted { color: var(--muted); }

footer { padding: 30px 0 60px; text-align: center; color: var(--muted); }

.category-tag {
  display: inline-block;
  margin-left: 0.5em;
  padding: 2px 8px;
  font-size: 0.85em;
  background: #e0e7ef;
  color: #2a3a4d;
  border-radius: 12px;
  font-weight: 500;
  vertical-align: middle;
}

.light-theme .category-tag {
  background: #f3f6fa;
  color: #3a4a5d;
}

.dark-theme .category-tag {
  background: #2a3a4d;
  color: #e0e7ef;
}