/* ============================================================
   Hans Lietz – Homepage
   Modern · minimalistisch · elegant · mit Augenzwinkern
   ============================================================ */

:root {
  /* Light (default) – warmes Papier, Tinten-Blau, Gold-Akzent */
  --bg:        #fbfaf7;
  --bg-2:      #f3f1ea;
  --surface:   #ffffff;
  --ink:       #14161a;
  --ink-soft:  #3a3f48;
  --ink-dim:   #5a6270;   /* WCAG AA: 4.5:1 auf --bg (vorher #6b727d ~3:1) */
  --line:      #e6e2d8;
  --accent:    #2746e6;   /* „Planck"-Blau */
  --accent-ink:#1b34b8;
  --gold:      #c6892b;   /* warmer Akzent / Physik-Wink */
  --hero-bg:   #0c0e14;   /* tiefes Weltall im Hero */
  --hero-ink:  #f4f6fb;
  --hero-dim:  #aab3c7;

  --radius:    16px;
  --radius-sm: 10px;
  --maxw:      1080px;
  --shadow:    0 1px 2px rgba(20,22,26,.04), 0 12px 32px -12px rgba(20,22,26,.14);
  --shadow-lg: 0 24px 60px -20px rgba(20,22,26,.28);

  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-disp: "Fraunces", Georgia, "Times New Roman", serif;
  font-size: 17px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:        #0c0e14;
    --bg-2:      #11141d;
    --surface:   #151925;
    --ink:       #eef1f8;
    --ink-soft:  #c7cedd;
    --ink-dim:   #8b93a7;
    --line:      #232838;
    --accent:    #7b93ff;
    --accent-ink:#9fb1ff;
    --gold:      #ffd166;
    --hero-bg:   #07080d;
    --hero-ink:  #f4f6fb;
    --hero-dim:  #aab3c7;
    --shadow:    0 1px 2px rgba(0,0,0,.4), 0 12px 32px -12px rgba(0,0,0,.6);
    --shadow-lg: 0 24px 60px -20px rgba(0,0,0,.7);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 5rem; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-ink); }
em { font-style: italic; }
strong { font-weight: 600; }

/* Sichtbarer Tastatur-Fokus (WCAG 2.4.7) – nur bei Tastaturnavigation, kein Maus-Effekt */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
.btn:focus-visible, .nav__cta:focus-visible { outline-offset: 4px; }

.skip {
  position: absolute; left: -999px; top: 0; z-index: 100;
  background: var(--accent); color: #fff; padding: .6rem 1rem; border-radius: 0 0 var(--radius-sm) 0;
}
.skip:focus { left: 0; }

/* ---------- Navigation ---------- */
.nav {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; max-width: var(--maxw); margin: 0 auto;
  padding: .85rem 1.5rem;
  /* die Bar selbst ist transparent; Hintergrund über ::before für blur */
}
.nav::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav__brand {
  display: inline-flex; align-items: center; gap: .55rem;
  font-family: var(--font-disp); font-weight: 600; font-size: 1.15rem;
  color: var(--ink); letter-spacing: -.01em;
}
.nav__brand:hover { color: var(--ink); }
.nav__mark {
  font-family: var(--font-disp); color: var(--accent);
  font-size: 1.3em; line-height: 1;
}
.nav__links { display: flex; align-items: center; gap: .35rem; }
.nav__links > a {
  color: var(--ink-soft); font-size: .94rem; font-weight: 500;
  padding: .5rem .75rem; border-radius: 999px; transition: background .15s, color .15s;
}
.nav__links > a:hover { color: var(--ink); background: var(--bg-2); }
.nav__cta {
  background: var(--ink); color: var(--bg) !important;
}
.nav__cta:hover { background: var(--accent); color: #fff !important; }
@media (max-width: 620px) {
  .nav__links > a:not(.nav__cta) { display: none; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  background: radial-gradient(1200px 700px at 75% -15%, #1b2444 0%, transparent 60%),
              radial-gradient(900px 600px at 5% 0%, #161a33 0%, transparent 55%),
              var(--hero-bg);
  color: var(--hero-ink);
}
.hero__stars {
  position: absolute; inset: 0; pointer-events: none; opacity: .9;
  background-image:
    radial-gradient(1.4px 1.4px at 20% 30%, #fff 50%, transparent),
    radial-gradient(1.2px 1.2px at 70% 20%, #fff 50%, transparent),
    radial-gradient(1.6px 1.6px at 40% 70%, #cfe0ff 50%, transparent),
    radial-gradient(1px 1px at 85% 60%, #fff 50%, transparent),
    radial-gradient(1.3px 1.3px at 55% 45%, #fff 50%, transparent),
    radial-gradient(1px 1px at 12% 80%, #cfe0ff 50%, transparent),
    radial-gradient(1.5px 1.5px at 90% 35%, #fff 50%, transparent),
    radial-gradient(1px 1px at 33% 15%, #fff 50%, transparent);
  animation: twinkle 6s ease-in-out infinite alternate;
}
@keyframes twinkle { from { opacity: .55; } to { opacity: 1; } }
.hero__inner {
  position: relative; max-width: var(--maxw); margin: 0 auto;
  padding: clamp(4.5rem, 12vw, 8.5rem) 1.5rem clamp(3.5rem, 8vw, 6rem);
}
.hero__eyebrow {
  margin: 0 0 1.1rem; text-transform: uppercase; letter-spacing: .18em;
  font-size: .78rem; font-weight: 600; color: var(--hero-dim);
}
.hero__title {
  font-family: var(--font-disp); font-weight: 600;
  font-size: clamp(1.9rem, 6.2vw, 4.6rem); line-height: 1.06;
  letter-spacing: -.02em; margin: 0 0 1.4rem; max-width: 16ch;
  hyphens: auto;
}
.hero__title em {
  font-style: italic; color: transparent;
  background: linear-gradient(100deg, #8fb0ff, #ffd166); -webkit-background-clip: text; background-clip: text;
}
.hero__lede {
  font-size: clamp(1.05rem, 2vw, 1.28rem); color: var(--hero-dim);
  max-width: 56ch; margin: 0 0 2.2rem;
}
.hero__lede strong { color: var(--hero-ink); font-weight: 600; }
.hero__actions { display: flex; flex-wrap: wrap; gap: .8rem; }
.hero__hint {
  margin: 2.6rem 0 0; font-size: .85rem; color: var(--hero-dim); opacity: .8;
}
kbd {
  font-family: var(--font-body); font-size: .78em;
  background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.22);
  border-radius: 6px; padding: .1em .5em;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .8rem 1.4rem; border-radius: 999px;
  font-weight: 600; font-size: .96rem; cursor: pointer;
  transition: transform .15s ease, box-shadow .2s ease, background .2s, color .2s;
  border: 1px solid transparent; white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn--primary { background: var(--accent); color: #fff; box-shadow: 0 8px 24px -8px var(--accent); }
.btn--primary:hover { color: #fff; box-shadow: 0 12px 30px -8px var(--accent); }
.btn--ghost {
  background: transparent; color: var(--hero-ink); border-color: rgba(255,255,255,.28);
}
.btn--ghost:hover { color: var(--hero-ink); background: rgba(255,255,255,.08); }
.btn--lg { padding: 1rem 1.8rem; font-size: 1.05rem; }

/* ---------- Sections ---------- */
.section { max-width: var(--maxw); margin: 0 auto; padding: clamp(3.5rem, 9vw, 6.5rem) 1.5rem; }
.section--alt { max-width: none; background: var(--bg-2); border-block: 1px solid var(--line); }
.section--alt > * { max-width: var(--maxw); margin-inline: auto; }
.section__head { max-width: 62ch; margin-bottom: 2.6rem; }
.section__kicker {
  display: inline-block; text-transform: uppercase; letter-spacing: .16em;
  font-size: .76rem; font-weight: 700; color: var(--accent); margin-bottom: .8rem;
}
.section__title {
  font-family: var(--font-disp); font-weight: 600;
  font-size: clamp(1.7rem, 4vw, 2.6rem); line-height: 1.12;
  letter-spacing: -.015em; margin: 0 0 .8rem;
}
.section__intro { color: var(--ink-dim); font-size: 1.08rem; margin: 0; }

/* ---------- Karten / Lerneinheiten ---------- */
.cards {
  display: grid; gap: 1.2rem;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
}
.card {
  display: flex; flex-direction: column; gap: .7rem;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: transform .2s ease, box-shadow .25s ease, border-color .2s;
}
.card:not(.card--soon):hover {
  transform: translateY(-4px); box-shadow: var(--shadow-lg);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--line));
}
.card__top { display: flex; align-items: center; justify-content: space-between; gap: .6rem; }
.card__glyph { font-size: 1.7rem; line-height: 1; }
.tag {
  font-size: .72rem; font-weight: 600; letter-spacing: .03em;
  color: var(--ink-dim); background: var(--bg-2);
  border: 1px solid var(--line); border-radius: 999px; padding: .25rem .65rem;
}
.card__title {
  font-family: var(--font-disp); font-weight: 600; font-size: 1.35rem;
  letter-spacing: -.01em; margin: .2rem 0 0;
}
.card__desc { color: var(--ink-soft); font-size: .96rem; margin: 0; flex: 1; }
.card__links {
  display: flex; align-items: center; justify-content: space-between;
  gap: .8rem; margin-top: .6rem; padding-top: .9rem; border-top: 1px solid var(--line);
}
.card__open { font-weight: 600; font-size: .96rem; }
.card__teacher {
  font-size: .85rem; color: var(--ink-dim); font-weight: 500;
}
.card__teacher:hover { color: var(--accent); }
.card--soon { opacity: .72; }
.card--soon .card__glyph { filter: grayscale(.5); }
.badge-soon {
  font-size: .8rem; font-weight: 600; color: var(--gold);
  background: color-mix(in srgb, var(--gold) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--gold) 40%, transparent);
  border-radius: 999px; padding: .3rem .8rem;
}

/* ---------- Säulen / Ansatz ---------- */
.pillars { display: grid; gap: 1.6rem; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.pillar__glyph { font-size: 2rem; display: block; margin-bottom: .7rem; }
.pillar h3 {
  font-family: var(--font-disp); font-weight: 600; font-size: 1.22rem;
  letter-spacing: -.01em; margin: 0 0 .5rem; line-height: 1.25;
}
.pillar p { color: var(--ink-soft); margin: 0; font-size: .98rem; }

/* ---------- Über mich ---------- */
.about {
  max-width: 760px; margin: 0 auto;
  display: grid; gap: 1rem;
}
.about__text p { color: var(--ink-soft); font-size: 1.05rem; }
.about__note { font-size: .9rem !important; color: var(--ink-dim) !important; }

/* ---------- CTA / Kontakt ---------- */
.section--cta { text-align: center; }
.cta {
  max-width: 56ch; margin: 0 auto;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 6px); padding: clamp(2.2rem, 6vw, 3.5rem);
  box-shadow: var(--shadow);
}
.cta__title { font-family: var(--font-disp); font-weight: 600; font-size: clamp(1.8rem, 4vw, 2.4rem); margin: 0 0 .7rem; }
.cta__text { color: var(--ink-soft); font-size: 1.08rem; margin: 0 0 1.8rem; }

/* ---------- Footer ---------- */
.foot {
  border-top: 1px solid var(--line); background: var(--bg-2);
  padding: 2.6rem 1.5rem 2rem;
}
.foot__row {
  max-width: var(--maxw); margin: 0 auto;
  display: flex; flex-wrap: wrap; gap: 1.4rem; align-items: flex-start; justify-content: space-between;
}
.foot__brand { font-family: var(--font-disp); font-weight: 600; font-size: 1.1rem; }
.foot__tagline { font-family: var(--font-body); font-weight: 400; font-size: .85rem; color: var(--ink-dim); margin: .3rem 0 0; }
.foot__links { display: flex; flex-wrap: wrap; gap: 1.2rem; }
.foot__links a { color: var(--ink-soft); font-size: .92rem; font-weight: 500; }
.foot__links a:hover { color: var(--accent); }
.foot__legal {
  max-width: var(--maxw); margin: 1.8rem auto 0; padding-top: 1.4rem;
  border-top: 1px solid var(--line); color: var(--ink-dim); font-size: .85rem;
}

/* ---------- Toast (Augenzwinkern) ---------- */
.toast {
  position: fixed; left: 50%; bottom: 1.6rem; transform: translate(-50%, 150%);
  background: var(--ink); color: var(--bg);
  padding: .75rem 1.2rem; border-radius: 999px; font-size: .92rem; font-weight: 500;
  box-shadow: var(--shadow-lg); z-index: 80; transition: transform .35s cubic-bezier(.2,.9,.3,1.2);
  pointer-events: none; max-width: 90vw;
}
.toast--show { transform: translate(-50%, 0); }

/* ---------- Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-in { opacity: 1; transform: none; }