/* =========================
   Theme variables
   ========================= */

:root {
  --bg: #ffffff;
  --text: #111111;
  --sub: #444444;

  --card-border: #eeeeee;
  --card-hover-border: #dddddd;
  --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
  --card-text: #555555;

  --footer: #777777;

  --btn-bg: #ffffff;
  --btn-border: #e6e6e6;
}

:root[data-theme="dark"] {
  --bg: #0b0f14;
  --text: #e8eef5;
  --sub: #a9b4c0;

  --card-border: #243042;
  --card-hover-border: #33435b;
  --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --card-text: #a9b4c0;

  --footer: #8fa0b2;

  --btn-bg: #0f1520;
  --btn-border: #243042;
}

/* =========================
   Base
   ========================= */

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 32px 18px 60px;
}

/* Headings / text */
h1 {
  font-size: 46px;
  margin: 0 0 8px;
  letter-spacing: -0.02em;
}

.sub {
  margin: 0 0 28px;
  color: var(--sub);
  font-size: 18px;
}

.footer {
  margin-top: 34px;
  color: var(--footer);
  font-size: 14px;
}

/* =========================
   Links (global)
   ========================= */

a,
a:visited {
  color: var(--text);
  text-decoration: none;
}

a:hover,
a:focus-visible {
  text-decoration: underline;
}

/* Optional: nav links slightly muted */
.site-nav .nav-link,
.site-nav .nav-link:visited {
  color: var(--card-text);
  text-decoration: none;
}

/* =========================
   Cards (Startseite)
   ========================= */

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.card {
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 18px;
  color: inherit;
  text-decoration: none;
  box-shadow: var(--card-shadow);
  transition: transform 0.12s ease, border-color 0.12s ease;
}

.card:hover {
  border-color: var(--card-hover-border);
  transform: translateY(-1px);
}

.card h2 {
  margin: 0 0 6px;
  font-size: 20px;
}

.card p {
  margin: 0;
  color: var(--card-text);
  line-height: 1.4;
}

/* =========================
   Global header / navigation
   ========================= */

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

.site-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 18px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand {
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-left: 8px;
}

.nav-link {
  padding: 6px 8px;
  border-radius: 10px;
}

.nav-link.active {
  color: var(--text);
  border: 1px solid var(--card-border);
}

/* =========================
   Theme toggle button
   ========================= */

.theme-toggle {
  margin-left: auto; /* rechts im Header */
  border: 1px solid var(--btn-border);
  background: var(--btn-bg);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 14px;
}

.theme-toggle:hover {
  transform: translateY(-1px);
}