/* Cyberfit Akademie – Stylesheet
   Keine externen Schriften oder Bibliotheken (DSGVO): es werden die Systemschriften genutzt. */

:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-2: #eef2f7;
  --text: #17202c;
  --text-soft: #4a5768;
  --border: #d9e0ea;
  --primary: #0b5fff;
  --primary-dark: #0846bd;
  --primary-soft: #e3ecff;
  --success: #137a3f;
  --success-soft: #e2f5ea;
  --danger: #b42318;
  --danger-soft: #fde8e7;
  --warning-soft: #fff4d6;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 4px 16px rgba(16, 24, 40, .06);
  --max: 1100px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f141b;
    --surface: #171e28;
    --surface-2: #1f2835;
    --text: #e8edf4;
    --text-soft: #a7b3c3;
    --border: #2c3747;
    --primary: #6e9dff;
    --primary-dark: #9bbcff;
    --primary-soft: #1c2a48;
    --success: #5fd08f;
    --success-soft: #16301f;
    --danger: #ff8a80;
    --danger-soft: #3a1c1a;
    --warning-soft: #3a3115;
    --shadow: none;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

img, svg, video { max-width: 100%; height: auto; display: block; }

a { color: var(--primary); }
a:hover { color: var(--primary-dark); }

:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; border-radius: 4px; }

h1, h2, h3 { line-height: 1.25; margin: 0 0 .5em; }
h1 { font-size: clamp(1.75rem, 4.5vw, 2.6rem); }
h2 { font-size: clamp(1.35rem, 3vw, 1.8rem); }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 16px; }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--primary); color: #fff; padding: .5rem 1rem; z-index: 100;
}
.skip-link:focus { left: 8px; top: 8px; }

/* Kopfzeile */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; flex-wrap: wrap; padding-top: 10px; padding-bottom: 10px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 1.2rem; color: var(--text); text-decoration: none;
}
.brand img { width: 34px; height: 34px; }
.site-nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 4px; flex-wrap: wrap; }
.site-nav a {
  display: block; padding: 8px 12px; border-radius: 10px;
  color: var(--text); text-decoration: none; font-weight: 500;
}
.site-nav a:hover { background: var(--surface-2); }
.site-nav a[aria-current="page"] { background: var(--primary-soft); color: var(--primary); }

/* Abschnitte */
main { display: block; }
.section { padding: 48px 0; }
.section-alt { background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.lead { font-size: 1.15rem; color: var(--text-soft); max-width: 48rem; }

.hero { padding: 56px 0 40px; }
.hero-grid { display: grid; gap: 32px; align-items: center; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 860px) { .hero-grid { grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); } }
.hero-art { width: 100%; max-width: 420px; margin: 0 auto; }

.btn-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 20px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 12px 22px; border-radius: 12px;
  font: inherit; font-weight: 600; text-decoration: none; cursor: pointer;
  border: 2px solid var(--primary); background: var(--primary); color: #fff;
}
.btn:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: #fff; }
.btn-secondary { background: transparent; color: var(--primary); }
.btn-secondary:hover { background: var(--primary-soft); color: var(--primary); }
@media (prefers-color-scheme: dark) {
  .btn { color: #0f141b; }
  .btn:hover { color: #0f141b; }
}

/* Karten */
.grid { display: grid; gap: 20px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow); display: flex; flex-direction: column;
}
.card h3 { margin-top: 8px; }
.card p { color: var(--text-soft); }
.card .btn { margin-top: auto; align-self: flex-start; }
.card-icon {
  width: 52px; height: 52px; border-radius: 12px; background: var(--primary-soft);
  display: grid; place-items: center; font-size: 1.6rem;
}
.meta { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.tag {
  font-size: .85rem; padding: 2px 10px; border-radius: 999px;
  background: var(--surface-2); color: var(--text-soft);
}
.tag-done { background: var(--success-soft); color: var(--success); font-weight: 600; }

.steps { counter-reset: step; list-style: none; padding: 0; margin: 0; display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.steps li { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.steps li::before {
  counter-increment: step; content: counter(step);
  display: inline-grid; place-items: center; width: 36px; height: 36px; border-radius: 50%;
  background: var(--primary); color: #fff; font-weight: 700; margin-bottom: 10px;
}
@media (prefers-color-scheme: dark) { .steps li::before { color: #0f141b; } }

.notice {
  border-radius: var(--radius); padding: 16px 18px; background: var(--primary-soft);
  border-left: 5px solid var(--primary);
}
.notice-warning { background: var(--warning-soft); border-left-color: #d29a00; }

/* Fortschritt */
.progress { height: 10px; background: var(--surface-2); border-radius: 999px; overflow: hidden; margin: 8px 0 4px; }
.progress-bar { height: 100%; width: 0; background: var(--success); transition: width .4s ease; }

/* Kursseite */
.breadcrumb { font-size: .95rem; color: var(--text-soft); margin-bottom: 12px; }
.breadcrumb a { color: var(--text-soft); }
.course-layout { display: grid; gap: 28px; grid-template-columns: 1fr; }
@media (min-width: 960px) { .course-layout { grid-template-columns: 260px 1fr; align-items: start; } }
.lesson-nav {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px;
}
@media (min-width: 960px) { .lesson-nav { position: sticky; top: 84px; } }
.lesson-nav ol { margin: 0; padding: 0; list-style: none; display: grid; gap: 4px; }
.lesson-nav a {
  display: block; padding: 10px 12px; border-radius: 10px; text-decoration: none; color: var(--text);
}
.lesson-nav a:hover { background: var(--surface-2); }
.lesson { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; margin-bottom: 24px; scroll-margin-top: 90px; }
.lesson ul { padding-left: 1.2em; }
.lesson li { margin-bottom: .4em; }

.video-frame {
  position: relative; aspect-ratio: 16 / 9; width: 100%; border-radius: 12px; overflow: hidden;
  background: #0f141b; margin-bottom: 18px;
}
.video-frame video { width: 100%; height: 100%; object-fit: contain; }
.video-placeholder {
  position: absolute; inset: 0; display: grid; place-content: center; text-align: center; gap: 10px;
  color: #dfe7f3; background: linear-gradient(135deg, #12233f, #0b5fff); padding: 16px;
}
.video-placeholder .play {
  width: 64px; height: 64px; margin: 0 auto; border-radius: 50%; background: rgba(255,255,255,.18);
  display: grid; place-items: center; font-size: 1.6rem;
}

/* Quiz */
.quiz fieldset { border: 1px solid var(--border); border-radius: 12px; padding: 16px; margin: 0 0 16px; }
.quiz legend { font-weight: 700; padding: 0 6px; }
.option {
  display: flex; gap: 12px; align-items: flex-start; padding: 12px; margin-top: 8px;
  border: 1px solid var(--border); border-radius: 10px; cursor: pointer; background: var(--bg);
}
.option:hover { border-color: var(--primary); }
.option input { margin-top: 5px; width: 20px; height: 20px; flex-shrink: 0; accent-color: var(--primary); }
.option.correct { border-color: var(--success); background: var(--success-soft); }
.option.wrong { border-color: var(--danger); background: var(--danger-soft); }
.explanation { margin: 10px 0 0; font-size: .95rem; color: var(--text-soft); }
.quiz-result { border-radius: var(--radius); padding: 18px; margin-top: 16px; }
.quiz-result.passed { background: var(--success-soft); border: 1px solid var(--success); }
.quiz-result.failed { background: var(--danger-soft); border: 1px solid var(--danger); }
.quiz-result:focus { outline: none; }

/* Rechtstexte */
.legal { max-width: 48rem; }
.legal h2 { margin-top: 1.6em; }
.placeholder { background: var(--warning-soft); padding: 0 4px; border-radius: 4px; }

/* Fußzeile */
.site-footer { background: var(--surface); border-top: 1px solid var(--border); padding: 28px 0; margin-top: 48px; color: var(--text-soft); font-size: .95rem; }
.site-footer .container { display: flex; gap: 16px; justify-content: space-between; flex-wrap: wrap; }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 18px; flex-wrap: wrap; }
.site-footer a { color: var(--text-soft); }

.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }

[hidden] { display: none !important; }

.linklike {
  background: none; border: 0; padding: 0; font: inherit; color: var(--primary);
  text-decoration: underline; cursor: pointer;
}

@media (max-width: 640px) {
  .site-header { position: static; }
  .site-nav a { padding: 6px 10px; }
}
#kurs-liste + p { margin-top: 20px; }