:root {
  --fg: #1a1a1a;
  --bg: #ffffff;
  --accent: #005a9c;
  --accent-fg: #ffffff;
  --surface: #f4f7fa;
  --border: #d4dce4;
  --error: #a4000f;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #f2f2f2;
    --bg: #121212;
    --accent: #4aa3ff;
    --accent-fg: #06121f;
    --surface: #1d1d1d;
    --border: #333333;
    --error: #ff8a80;
  }
}

* { box-sizing: border-box; }

body {
  font-family: system-ui, sans-serif;
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
  margin: 0;
  padding: 0;
}

main { max-width: 48rem; margin: 0 auto; padding: 1rem; }

header {
  padding: 0.75rem 1rem;
  border-bottom: 2px solid var(--accent);
  background: var(--surface);
}

.site-title {
  font-weight: bold;
  font-size: 1.25rem;
  margin: 0 0 0.5rem;
  color: var(--accent);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 100;
  background: var(--accent);
  color: var(--accent-fg);
  padding: 0.6rem 1.25rem;
  font-weight: bold;
  border-radius: 0 0 6px 0;
  text-decoration: none;
}
.skip-link:focus { left: 0; }

a { color: var(--accent); }
a:focus, button:focus, input:focus { outline: 3px solid var(--accent); outline-offset: 2px; }

.navbar {
  border-radius: 6px;
}
.navbar ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  padding: 0;
  margin: 0;
}
.navbar a {
  display: inline-block;
  padding: 0.5rem 0.85rem;
  text-decoration: none;
  color: var(--accent);
  border: 2px solid transparent;
  border-radius: 6px;
}
.navbar a:hover { background: var(--bg); border-color: var(--border); }
.navbar a:focus { outline: 3px solid var(--accent); outline-offset: 2px; }
.navbar a[aria-current="page"] {
  background: var(--accent);
  color: var(--accent-fg);
  font-weight: bold;
}
.navbar-logout { margin-left: auto; }
.navbar-logout button {
  background: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
}
.navbar-logout button:hover { background: var(--accent); color: var(--accent-fg); }

label { display: block; font-weight: bold; margin-bottom: 0.25rem; }
input {
  font-size: 1rem;
  padding: 0.5rem;
  width: 100%;
  max-width: 24rem;
  border: 2px solid var(--fg);
  border-radius: 4px;
  background: var(--bg);
  color: var(--fg);
}
button {
  font-size: 1rem;
  padding: 0.5rem 1.25rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

.error {
  color: var(--error);
  font-weight: bold;
  border: 2px solid var(--error);
  padding: 0.75rem;
  border-radius: 4px;
}

.view-info { font-weight: bold; margin-top: 0; }
.list-info { font-weight: bold; margin-top: 0; }

.lessons { list-style: none; padding: 0; }
.lesson {
  padding: 0.75rem;
  border-left: 6px solid var(--accent);
  margin-bottom: 0.5rem;
  background: rgba(0, 90, 156, 0.06);
}
.lesson-cancelled { border-left-color: var(--error); text-decoration: line-through; }
.lesson-changed { border-left-color: #b06f00; }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}