:root {
  --bg: #f7f7f5; --surface: #fff; --text: #1c1c1a; --muted: #5d5d58; --border: #d6d6d0;
  --accent: #1a5fb4; --accent-text: #fff; --ok-bg: #e5f4ea; --ok-text: #1d6b35; --err-bg: #fde7e7; --err-text: #8a1c1c;
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, Arial, sans-serif; line-height: 1.5; color: var(--text); background: var(--bg);
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #161615; --surface: #222220; --text: #ededea; --muted: #a9a9a3; --border: #3d3d39; --accent: #78aeed; --accent-text: #0d1b2a;
    --ok-bg: #1d3325; --ok-text: #9fe0b4; --err-bg: #3e1d1d; --err-text: #f5b5b5; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); }
.login { max-width: 28rem; margin: 3rem auto; padding: 1.5rem; background: var(--surface); border: 1px solid var(--border); border-radius: 8px; }
h1 { margin: 0 0 0.25rem; font-size: 1.5rem; }
.sub, .muted, .version { color: var(--muted); }
.version { font-size: 0.8rem; text-align: right; margin: 1rem 0 0; }
label { display: block; margin: 0.75rem 0 0.25rem; font-weight: 600; }
input, textarea, button { font: inherit; width: 100%; min-height: 44px; padding: 0.5rem 0.75rem; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); color: var(--text); }
input.code { font-size: 1.5rem; letter-spacing: 0.3em; text-align: center; }
button { margin-top: 0.75rem; background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; cursor: pointer; }
button.link { background: none; border: none; color: var(--accent); text-decoration: underline; font-weight: normal; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.msg { padding: 0.5rem 0.75rem; border-radius: 8px; margin: 0.75rem 0; }
.msg.ok { background: var(--ok-bg); color: var(--ok-text); }
.msg.err { background: var(--err-bg); color: var(--err-text); }
.ask { margin-top: 1.5rem; }
.ask summary { cursor: pointer; color: var(--accent); }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; }
.mt { margin-top: 0.5rem; }
nav.top { display: flex; justify-content: space-between; gap: 1rem; max-width: 40rem; margin: 1rem auto; padding: 0 1rem; }
main.admin, .admin { max-width: 40rem; margin: 1rem auto; padding: 1rem; background: var(--surface); border: 1px solid var(--border); border-radius: 8px; }
table { border-collapse: collapse; width: 100%; } td, th { text-align: left; padding: 0.3rem; border-bottom: 1px solid var(--border); }
/* Startseite: Slideshow + Anmeldung */
.start { display: grid; grid-template-columns: minmax(0, 1.7fr) minmax(18rem, 1fr); gap: 1.5rem; max-width: 76rem; margin: 2rem auto; padding: 0 1rem; align-items: start; }
.start .login { margin: 0; }
@media (max-width: 860px) { .start { grid-template-columns: 1fr; } .start .login { order: -1; } }
.tour { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 1rem; }
.tour h2 { margin: 0 0 0.75rem; font-size: 1.15rem; }
.slide { margin: 0; }
.slide img { width: 100%; height: auto; border: 1px solid var(--border); border-radius: 6px; display: block; }
.slide figcaption { margin-top: 0.6rem; min-height: 3em; }
.tour-controls { display: flex; align-items: center; gap: 0.5rem; margin-top: 0.5rem; flex-wrap: wrap; }
.tour-controls button { width: auto; min-height: 40px; margin: 0; padding: 0.2rem 0.8rem; background: var(--surface); color: var(--text); border-color: var(--border); font-weight: normal; }
.tour-dots { display: flex; gap: 0.35rem; flex: 1; justify-content: center; }
.tour-dots button { width: 12px; min-height: 12px; height: 12px; padding: 0; border-radius: 50%; background: var(--border); border: none; }
.tour-dots button[aria-current="true"] { background: var(--accent); }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
/* Infoseiten */
.page { max-width: 46rem; margin: 2rem auto; padding: 1.5rem; background: var(--surface); border: 1px solid var(--border); border-radius: 8px; }
.page h2 { margin-top: 1.75rem; font-size: 1.15rem; }
.page .lead { font-size: 1.05rem; }
.page .back { margin: 0 0 0.5rem; }
a { color: var(--accent); }
.site-footer { text-align: center; color: var(--muted); font-size: 0.9rem; margin: 1.5rem auto 2rem; padding: 0 1rem; }
code { background: var(--bg); padding: 0 0.25rem; border-radius: 4px; }