:root {
  --bg: #eef3f9;
  --bg-radial-start: #dfe9f8;
  --bg-radial-end: #d9e7fb;
  --card-bg: #ffffff;
  --text: #233044;
  --muted: #5f6f86;
  --link-bg: #2b6cb0;
  --link-bg-hover: #1f4f83;
  --logout-bg: #59677d;
  --logout-bg-hover: #435166;
  --empty-text: #9a3f3f;
  --empty-bg: #fce8e8;
  --empty-border: #f5c8c8;
  --card-shadow: rgba(39, 62, 93, 0.14);
  --focus-ring: rgba(94, 161, 255, 0.45);
}

html.dark-theme {
  color-scheme: dark;
  --bg: #0f172a;
  --bg-radial-start: #172642;
  --bg-radial-end: #12324b;
  --card-bg: #182235;
  --text: #f8fafc;
  --muted: #9aa7bd;
  --link-bg: #1d4f8f;
  --link-bg-hover: #2f77d3;
  --logout-bg: #334155;
  --logout-bg-hover: #475569;
  --empty-text: #ffb4bd;
  --empty-bg: #431f26;
  --empty-border: #7f2e3a;
  --card-shadow: rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", Tahoma, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 10% 0%, var(--bg-radial-start) 0%, rgba(223, 233, 248, 0) 45%),
    radial-gradient(circle at 90% 100%, var(--bg-radial-end) 0%, rgba(217, 231, 251, 0) 40%),
    var(--bg);
  display: grid;
  place-items: center;
  padding: 24px;
}

.card {
  width: min(680px, 100%);
  background: var(--card-bg);
  border-radius: 16px;
  box-shadow: 0 10px 35px var(--card-shadow);
  padding: 28px;
}

h1 {
  margin: 0 0 8px;
  font-size: 30px;
  line-height: 1.2;
}

p {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 15px;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.app-link {
  display: block;
  width: 100%;
  border: 0;
  text-decoration: none;
  background: var(--link-bg);
  color: #fff;
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 16px;
  font-weight: 600;
  font-family: inherit;
  text-align: left;
  cursor: pointer;
  transition: background-color .15s ease-in-out, box-shadow .15s ease-in-out;
}

.app-link:hover,
.app-link:focus {
  background: var(--link-bg-hover);
}

.app-link:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.logout-link {
  background: var(--logout-bg);
}

.logout-link:hover,
.logout-link:focus {
  background: var(--logout-bg-hover);
}

.empty {
  color: var(--empty-text);
  background: var(--empty-bg);
  border: 1px solid var(--empty-border);
  border-radius: 10px;
  padding: 12px;
  font-size: 14px;
}