/* alexsmathguides – shared stylesheet
   Used by: index.html, impressum.html, datenschutz.html
   ================================================== */


    :root {
      --bg: #ffffff;
      --surface: #f4f7fb;
      --surface-2: #e9eff7;
      --text: #0f172a;
      --muted: #475569;
      --line: #d8e2ee;
      --primary: #0b2a4a;
      --primary-2: #133a63;
      --white: #ffffff;
      --success: #0f766e;
      --radius: 18px;
      --shadow: 0 14px 40px rgba(11, 42, 74, 0.10);
      --max: 1120px;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      font-family: 'Inter', sans-serif;
      color: var(--text);
      background: var(--bg);
      line-height: 1.6;
    }

    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; display: block; }
    .container { width: min(var(--max), calc(100% - 32px)); margin: 0 auto; }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      padding: 14px 20px;
      border-radius: 999px;
      border: 1px solid transparent;
      font-weight: 600;
      transition: .2s ease;
      cursor: pointer;
    }

    .btn-primary {
      background: var(--primary);
      color: var(--white);
    }

    .btn-primary:hover { background: var(--primary-2); }

    .btn-secondary {
      background: transparent;
      border-color: var(--line);
      color: var(--primary);
    }

    .btn-secondary:hover {
      background: var(--surface);
    }

    .section {
      padding: 88px 0;
    }

    .eyebrow {
      display: inline-block;
      padding: 8px 12px;
      border-radius: 999px;
      background: #eaf1f8;
      color: var(--primary);
      font-size: 14px;
      font-weight: 700;
      letter-spacing: .02em;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(255,255,255,.88);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(216, 226, 238, 0.7);
    }

    .nav {
      min-height: 74px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
    }

    .nav-links {
      display: flex;
      gap: 20px;
      align-items: center;
      color: var(--muted);
      font-size: 15px;
    }

    .hero {
      padding: 80px 0 64px;
      background: linear-gradient(180deg, #ffffff 0%, #f7faff 100%);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr .9fr;
      gap: 36px;
      align-items: center;
    }

    h1, h2, h3 { line-height: 1.1; margin: 0 0 16px; }
    h1 { font-size: clamp(40px, 7vw, 68px); letter-spacing: -0.03em; }
    h2 { font-size: clamp(28px, 4vw, 42px); letter-spacing: -0.02em; }
    h3 { font-size: 22px; }
    p { margin: 0 0 16px; color: var(--muted); }

    .hero-copy p {
      font-size: 18px;
      max-width: 62ch;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-top: 28px;
    }

    .hero-card,
    .card,
    .embed-box {
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
    }

    .hero-card {
      padding: 28px;
    }

    .check-list {
      display: grid;
      gap: 12px;
      margin-top: 18px;
    }

    .check-item {
      display: flex;
      gap: 12px;
      align-items: flex-start;
      color: var(--text);
    }

    .check-badge {
      flex: 0 0 28px;
      height: 28px;
      border-radius: 50%;
      background: var(--primary);
      color: white;
      display: grid;
      place-items: center;
      font-size: 14px;
      font-weight: 700;
      margin-top: 2px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .card {
      padding: 24px;
    }

    .card p:last-child { margin-bottom: 0; }

    .split {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      align-items: start;
    }

    .embed-box {
      padding: 24px;
      min-height: 320px;
    }

    .placeholder {
      margin-top: 18px;
      border: 1.5px dashed #aac0d8;
      border-radius: 16px;
      background: #f7fbff;
      min-height: 220px;
      display: grid;
      place-items: center;
      padding: 22px;
      text-align: center;
      color: var(--muted);
    }

    .code-inline {
      display: inline-block;
      padding: 3px 8px;
      border-radius: 8px;
      background: #edf3f9;
      color: var(--primary);
      font-size: 14px;
      font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    }

    .newsletter-box {
      background: var(--primary);
      color: white;
      border-radius: 28px;
      padding: 32px;
    }

    .newsletter-box p,
    .newsletter-box li {
      color: rgba(255,255,255,.82);
    }

    .steps {
      padding-left: 18px;
      margin: 14px 0 0;
    }

    .footer {
      padding: 28px 0 56px;
      color: var(--muted);
      font-size: 14px;
    }

    .footer-links {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-top: 8px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-weight: 800;
      font-size: 20px;
      color: var(--primary);
      text-decoration: none;
    }

    .brand-logo {
      height: 45px;     /* kannst du auf 28–40 px variieren */
      width: auto;
      display: block;
    }

    @media (max-width: 920px) {
      .hero-grid,
      .split,
      .grid-3 {
        grid-template-columns: 1fr;
      }

      .nav {
        flex-direction: column;
        justify-content: center;
        padding: 14px 0;
      }

      .nav-links {
        flex-wrap: wrap;
        justify-content: center;
      }

      .section { padding: 72px 0; }
      .hero { padding-top: 48px; }

    }
  

/* ── Datenschutz & Impressum extras ── */
a { color: inherit; }

.toc {
  background: var(--surface);
  border-radius: 12px;
  padding: 20px 24px;
  margin: 24px 0 0;
}
.toc ol { margin: 8px 0 0; padding-left: 20px; color: var(--muted); }
.toc li { margin-bottom: 4px; }
.toc a { color: var(--primary); text-decoration: none; font-size: 14px; }
.toc a:hover { text-decoration: underline; }

.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  background: #eaf1f8;
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 6px;
}