/* ============================================================
   Ring-Protokoll — Website Stylesheet
   Farben: Primär #0A3D62 (DSB-Blau), Akzent #E67E22 (Orange)
   Font: System-Stack (kein Google Fonts, DSGVO-konform)
   ============================================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  --c-primary: #0A3D62;
  --c-primary-dark: #062B46;
  --c-primary-light: #1F6FEB;
  --c-accent: #E67E22;
  --c-accent-dark: #C76511;
  --c-text: #1F2D3D;
  --c-text-muted: #57677A;
  --c-bg: #FFFFFF;
  --c-bg-alt: #F5F7FA;
  --c-border: #DDE3EB;
  --c-success: #27AE60;

  --radius: 8px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(10, 61, 98, 0.06), 0 2px 6px rgba(10, 61, 98, 0.04);
  --shadow: 0 4px 14px rgba(10, 61, 98, 0.10);

  --container: 1160px;
  --gap: 1.5rem;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, "Noto Sans", sans-serif,
               "Apple Color Emoji", "Segoe UI Emoji";
}

/* ---------- Reset / Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.6;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; display: block; }
a { color: var(--c-primary); text-decoration: underline; text-underline-offset: 3px; }
a:hover { color: var(--c-accent-dark); }
a:focus-visible,
button:focus-visible { outline: 3px solid var(--c-accent); outline-offset: 2px; border-radius: 4px; }

h1, h2, h3, h4 { color: var(--c-primary); line-height: 1.25; margin: 0 0 0.6em; font-weight: 700; }
h1 { font-size: clamp(1.9rem, 4.5vw, 3rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); }
h3 { font-size: 1.2rem; }

p { margin: 0 0 1em; }
ul { padding-left: 1.2em; }
hr { border: 0; height: 1px; background: var(--c-border); margin: 2.5rem 0; }

/* ---------- Layout ---------- */
.container { max-width: var(--container); margin: 0 auto; padding: 0 1.25rem; }
.section { padding: 4rem 0; }
.section--alt { background: var(--c-bg-alt); }
.section__lead { max-width: 720px; color: var(--c-text-muted); margin-bottom: 2rem; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: saturate(1.2) blur(6px);
  border-bottom: 1px solid var(--c-border);
}
.site-header__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 0.75rem 1.25rem;
  max-width: var(--container); margin: 0 auto;
}
.brand {
  display: flex; align-items: center; gap: 0.6rem;
  text-decoration: none; color: var(--c-primary); font-weight: 700;
}
.brand img { height: 40px; width: auto; }
.brand__name { font-size: 1.1rem; letter-spacing: -0.01em; }

.nav { display: flex; gap: 0.25rem; align-items: center; }
.nav a {
  text-decoration: none; color: var(--c-text);
  padding: 0.5rem 0.85rem; border-radius: var(--radius);
  font-weight: 500;
}
.nav a:hover { background: var(--c-bg-alt); color: var(--c-primary); }
.nav a[aria-current="page"] { color: var(--c-primary); background: var(--c-bg-alt); }
.nav__lang { margin-left: 0.5rem; font-size: 0.9rem; color: var(--c-text-muted); }

/* Mobile-Nav-Toggle */
.nav-toggle {
  display: none;
  background: none; border: 1px solid var(--c-border);
  padding: 0.5rem 0.75rem; border-radius: var(--radius);
  font-size: 1rem; cursor: pointer; color: var(--c-primary);
}

/* ---------- Hero ---------- */
.hero {
  padding: 4rem 0 3rem;
  background: linear-gradient(180deg, #EEF3F9 0%, #FFFFFF 100%);
  border-bottom: 1px solid var(--c-border);
}
.hero__inner { display: grid; grid-template-columns: 1fr; gap: 2.5rem; align-items: center; }
.hero__title { margin-bottom: 0.4em; }
.hero__subtitle { font-size: 1.2rem; color: var(--c-text-muted); margin-bottom: 1rem; font-weight: 500; }
.hero__claim { font-size: 1.05rem; max-width: 560px; margin-bottom: 1.8rem; }
.hero__ctas { display: flex; gap: 0.75rem; flex-wrap: wrap; }

/* Store Badges (Platzhalter) */
.store-badge {
  display: inline-flex; align-items: center; gap: 0.6rem;
  padding: 0.75rem 1.2rem; border-radius: var(--radius);
  background: var(--c-primary); color: #fff;
  text-decoration: none; font-weight: 600;
  min-width: 180px; justify-content: center;
  transition: background 0.15s ease, transform 0.15s ease;
}
.store-badge:hover { background: var(--c-primary-dark); color: #fff; transform: translateY(-1px); }
.store-badge--accent { background: var(--c-accent); }
.store-badge--accent:hover { background: var(--c-accent-dark); color: #fff; }
.store-badge small { font-size: 0.7rem; font-weight: 400; opacity: 0.85; display: block; }

/* Screenshot-Platzhalter */
.screenshot-placeholder {
  background: var(--c-bg-alt);
  border: 1px dashed var(--c-border);
  border-radius: var(--radius-lg);
  aspect-ratio: 16 / 10;
  display: flex; align-items: center; justify-content: center;
  color: var(--c-text-muted); font-style: italic; font-size: 0.95rem;
  text-align: center; padding: 1.5rem;
}

/* ---------- Feature Grid ---------- */
.feature-grid {
  display: grid; gap: 1.25rem;
  grid-template-columns: 1fr;
}
.feature-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.feature-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.feature-card__icon {
  width: 44px; height: 44px;
  background: var(--c-primary); color: #fff;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 1.2rem; margin-bottom: 1rem;
}
.feature-card h3 { margin-top: 0; margin-bottom: 0.4em; }
.feature-card p { margin: 0; color: var(--c-text-muted); }

/* ---------- Audience / Planned ---------- */
.two-col {
  display: grid; gap: 2rem;
  grid-template-columns: 1fr;
}
.info-list { list-style: none; padding: 0; margin: 0; }
.info-list li {
  padding: 0.75rem 0; border-bottom: 1px solid var(--c-border);
}
.info-list li:last-child { border-bottom: 0; }
.info-list strong { color: var(--c-primary); }

/* ---------- Features Page Table ---------- */
.feature-table {
  width: 100%; border-collapse: collapse;
  background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius-lg);
  overflow: hidden;
}
.feature-table th, .feature-table td {
  text-align: left; padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--c-border);
  vertical-align: top;
}
.feature-table th {
  background: var(--c-bg-alt); color: var(--c-primary);
  font-weight: 600; width: 30%;
}
.feature-table tr:last-child td { border-bottom: 0; }

/* ---------- FAQ ---------- */
.faq details {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin-bottom: 0.75rem;
}
.faq summary {
  cursor: pointer; font-weight: 600; color: var(--c-primary);
  list-style: none; padding-right: 1.5rem; position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 0; top: 0;
  font-size: 1.4rem; color: var(--c-accent); font-weight: 400;
}
.faq details[open] summary::after { content: "–"; }
.faq details p { margin: 0.75rem 0 0; color: var(--c-text); }

/* ---------- Contact Box ---------- */
.contact-box {
  background: var(--c-primary); color: #fff;
  border-radius: var(--radius-lg);
  padding: 2rem;
}
.contact-box h2 { color: #fff; }
.contact-box a { color: #fff; text-decoration: underline; font-weight: 600; }

/* ---------- Legal Content ---------- */
.legal-content {
  max-width: 760px;
  background: #fff;
  padding: 2.5rem;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
}
.legal-content h1, .legal-content h2, .legal-content h3 { color: var(--c-primary); }
.legal-content h2 { margin-top: 2em; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--c-primary-dark); color: #C6D3E0;
  padding: 3rem 0 2rem; margin-top: 4rem;
}
.site-footer .container { display: grid; gap: 1.5rem; }
.site-footer h4 { color: #fff; margin-bottom: 0.5em; font-size: 1rem; }
.site-footer a { color: #fff; text-decoration: none; }
.site-footer a:hover { color: var(--c-accent); text-decoration: underline; }
.site-footer__disclaimer {
  font-size: 0.85rem; color: #8FA2B8; max-width: 700px;
  border-top: 1px solid rgba(255,255,255,0.1); padding-top: 1.25rem;
}
.site-footer__meta { display: flex; gap: 1rem; flex-wrap: wrap; font-size: 0.9rem; }

/* ---------- Utilities ---------- */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0;
  margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0;
}
.text-center { text-align: center; }

/* ---------- Responsive ---------- */
@media (min-width: 640px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .site-footer .container { grid-template-columns: 2fr 1fr 1fr; gap: 2.5rem; }
}
@media (min-width: 960px) {
  .hero__inner { grid-template-columns: 1.1fr 1fr; gap: 3rem; }
  .feature-grid { grid-template-columns: repeat(3, 1fr); }
  .two-col { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav { display: none; flex-direction: column; position: absolute;
         top: 100%; left: 0; right: 0; background: #fff;
         border-bottom: 1px solid var(--c-border); padding: 0.5rem; gap: 0.25rem; }
  .nav.is-open { display: flex; }
  .nav a { width: 100%; padding: 0.75rem 1rem; }
  .nav-toggle { display: inline-flex; }
}

/* ---------- Print ---------- */
@media print {
  .site-header, .site-footer, .nav-toggle { display: none; }
  body { color: #000; }
  a { color: #000; text-decoration: underline; }
}