:root {
  --bg: #0f1115;
  --panel: #171a21;
  --text: #e6e8ee;
  --muted: #9aa1ad;
  --accent: #4f8ef7;
  --border: #262b36;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  padding-bottom: 14px;
}

.brand { font-weight: 700; letter-spacing: 0.02em; }

nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 16px;
}

nav a:hover { color: var(--text); }

.hero { padding: 48px 0 16px; }
.hero h1 { margin: 0 0 12px; font-size: 28px; }
.hero p { color: var(--muted); max-width: 640px; }

code {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 0.9em;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  padding: 24px 0;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 18px;
}

.card h2 { margin: 0 0 8px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 14.5px; }

.demo { padding: 16px 0 48px; }
.demo h2 { font-size: 20px; }

#note-form {
  display: flex;
  gap: 10px;
  margin: 12px 0;
}

#note-form input {
  flex: 1;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 10px 12px;
  font: inherit;
}

#note-form input:focus { outline: 1px solid var(--accent); }

#note-form button {
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: 8px;
  padding: 10px 18px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

#note-form button:hover { filter: brightness(1.1); }

.notes {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}

.notes li {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.notes .when { color: var(--muted); font-size: 13px; white-space: nowrap; }

.muted { color: var(--muted); font-size: 14px; }

.error { color: #f28b82; }

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
  padding: 16px 0 32px;
}