/* leitner-interactive.de – ein Stylesheet, keine Abhängigkeiten */

:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --text: #1c1d1f;
  --muted: #5d6066;
  --line: #e4e1da;
  --accent: #b4441c;
  --accent-soft: #f6e7df;
  --radius: 10px;
  --wrap: 68rem;
  --measure: 40rem;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141517;
    --surface: #1c1d20;
    --text: #ececea;
    --muted: #a3a6ab;
    --line: #2e3034;
    --accent: #f0875c;
    --accent-soft: #2c1f19;
  }
}

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 5rem; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 1.0625rem/1.65 var(--font);
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-underline-offset: 0.2em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 3px; }

h1, h2, h3 { line-height: 1.2; letter-spacing: -0.015em; margin: 0 0 0.6em; }
h1 { font-size: clamp(2rem, 1.4rem + 3vw, 3.25rem); }
h2 { font-size: clamp(1.5rem, 1.2rem + 1.4vw, 2rem); }
h3 { font-size: 1.15rem; }
p, ul { margin: 0 0 1em; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 1.25rem; }

.skip { position: absolute; left: -999px; top: 0; background: var(--accent); color: #fff; padding: 0.5rem 1rem; }
.skip:focus { left: 1rem; top: 1rem; z-index: 10; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 4rem; flex-wrap: wrap; }
.brand { font-weight: 700; font-size: 1.1rem; color: var(--text); text-decoration: none; letter-spacing: -0.01em; }
.brand span { color: var(--accent); }
.site-header nav { display: flex; gap: 1.25rem; flex-wrap: wrap; }
.site-header nav a { color: var(--muted); text-decoration: none; font-size: 0.95rem; }
.site-header nav a:hover { color: var(--text); }

/* Hero */
.hero { padding-top: clamp(4rem, 10vw, 8rem); padding-bottom: clamp(3rem, 7vw, 5rem); }
.eyebrow { font-family: var(--mono); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent); margin-bottom: 1rem; }
.hero h1 { max-width: 18ch; }
.lead { font-size: clamp(1.1rem, 1rem + 0.5vw, 1.3rem); color: var(--muted); max-width: var(--measure); }
.actions { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-top: 2rem; }
.btn {
  display: inline-block; padding: 0.7rem 1.2rem; border-radius: var(--radius);
  background: var(--accent); color: #fff; font-weight: 600; text-decoration: none;
  border: 1px solid var(--accent);
}
.btn:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; color: var(--text); border-color: var(--line); }
@media (prefers-color-scheme: dark) { .btn { color: #141517; } }

.facts { display: flex; gap: 2.5rem; flex-wrap: wrap; margin-top: 3.5rem; padding-top: 2rem; border-top: 1px solid var(--line); }
.facts div { min-width: 8rem; }
.facts strong { display: block; font-size: 1.75rem; letter-spacing: -0.02em; }
.facts span { color: var(--muted); font-size: 0.9rem; }

/* Sections */
section { padding: clamp(3rem, 7vw, 5rem) 0; border-top: 1px solid var(--line); }
.section-head { max-width: var(--measure); margin-bottom: 2.5rem; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr)); gap: 1.25rem; list-style: none; padding: 0; margin: 0; }
.card {
  display: flex; flex-direction: column; padding: 1.75rem;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  color: var(--text); text-decoration: none;
  transition: border-color 0.15s, transform 0.15s;
  height: 100%;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card .num { font-family: var(--mono); font-size: 0.8rem; color: var(--accent); margin-bottom: 1.25rem; }
.card p { color: var(--muted); flex: 1; }
.card .more { color: var(--accent); font-weight: 600; font-size: 0.95rem; margin: 0; }

.contact { display: grid; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); gap: 2rem; }
address { font-style: normal; }

/* Unterseiten */
.prose { max-width: calc(var(--measure) + 2.5rem); padding-top: clamp(3rem, 8vw, 5rem); padding-bottom: 4rem; }
.facts div { flex: 0 0 auto; }
.prose h2 { font-size: 1.35rem; margin-top: 2.5rem; }
.prose h3 { margin-top: 1.75rem; }
.prose ul { padding-left: 1.2rem; }
.prose li { margin-bottom: 0.35em; }
.prose li::marker { color: var(--accent); }
.tags { display: flex; flex-wrap: wrap; gap: 0.5rem; list-style: none; padding: 0 !important; }
.tags li { background: var(--accent-soft); border-radius: 999px; padding: 0.25rem 0.8rem; font-size: 0.9rem; margin: 0; }
.back { margin-top: 3rem; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); padding: 2rem 0; color: var(--muted); font-size: 0.9rem; }
.site-footer .wrap { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.site-footer p { margin: 0; }
.site-footer nav { display: flex; gap: 1.25rem; }
.site-footer a { color: var(--muted); }