/* ==========================================================================
   Shared Stylesheet für frederiktrojahn.de
   Modernes, barrierefreies Design für App Store Datenschutz & Kontakt/Support
   Unterstützt automatisches Light- & Dark-Mode via color-scheme und light-dark()
   ========================================================================== */

:root {
  /* Farbschema */
  color-scheme: light dark;

  /* Helle Farben */
  --bg-canvas-light: #f5f5f7;
  --bg-surface-light: #ffffff;
  --bg-surface-subtle-light: #f0f1f3;
  --text-primary-light: #1d1d1f;
  --text-secondary-light: #6e6e73;
  --text-muted-light: #86868b;
  --border-light: rgba(0, 0, 0, 0.08);
  --border-strong-light: rgba(0, 0, 0, 0.16);
  --accent-light: #0071e3;
  --accent-hover-light: #0077ed;
  --accent-surface-light: rgba(0, 113, 227, 0.08);
  --badge-bg-light: #e8f2fc;
  --badge-text-light: #0066cc;
  --notice-bg-light: #fbfbfd;
  --shadow-light: 0 4px 20px rgba(0, 0, 0, 0.05), 0 1px 3px rgba(0, 0, 0, 0.03);

  /* Dunkle Farben */
  --bg-canvas-dark: #000000;
  --bg-surface-dark: #1c1c1e;
  --bg-surface-subtle-dark: #2c2c2e;
  --text-primary-dark: #f5f5f7;
  --text-secondary-dark: #a1a1a6;
  --text-muted-dark: #6e6e73;
  --border-dark: rgba(255, 255, 255, 0.12);
  --border-strong-dark: rgba(255, 255, 255, 0.22);
  --accent-dark: #2997ff;
  --accent-hover-dark: #47a6ff;
  --accent-surface-dark: rgba(41, 151, 255, 0.14);
  --badge-bg-dark: #12283f;
  --badge-text-dark: #64b5f6;
  --notice-bg-dark: #161618;
  --shadow-dark: 0 4px 24px rgba(0, 0, 0, 0.4), 0 1px 3px rgba(0, 0, 0, 0.2);

  /* Dynamische Tokens via light-dark() mit Fallback */
  --bg-canvas: light-dark(var(--bg-canvas-light), var(--bg-canvas-dark));
  --bg-surface: light-dark(var(--bg-surface-light), var(--bg-surface-dark));
  --bg-surface-subtle: light-dark(var(--bg-surface-subtle-light), var(--bg-surface-subtle-dark));
  --text-primary: light-dark(var(--text-primary-light), var(--text-primary-dark));
  --text-secondary: light-dark(var(--text-secondary-light), var(--text-secondary-dark));
  --text-muted: light-dark(var(--text-muted-light), var(--text-muted-dark));
  --border: light-dark(var(--border-light), var(--border-dark));
  --border-strong: light-dark(var(--border-strong-light), var(--border-strong-dark));
  --accent: light-dark(var(--accent-light), var(--accent-dark));
  --accent-hover: light-dark(var(--accent-hover-light), var(--accent-hover-dark));
  --accent-surface: light-dark(var(--accent-surface-light), var(--accent-surface-dark));
  --badge-bg: light-dark(var(--badge-bg-light), var(--badge-bg-dark));
  --badge-text: light-dark(var(--badge-text-light), var(--badge-text-dark));
  --notice-bg: light-dark(var(--notice-bg-light), var(--notice-bg-dark));
  --shadow: light-dark(var(--shadow-light), var(--shadow-dark));

  /* Typografie & Spacing */
  --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --transition-speed: 0.2s;
  --container-width: 820px;

  /* Akzentfarbe für native Browser-Elemente */
  accent-color: var(--accent);
}

/* Fallback für ältere Browser ohne light-dark() */
@supports not (color: light-dark(white, black)) {
  :root {
    --bg-canvas: var(--bg-canvas-light);
    --bg-surface: var(--bg-surface-light);
    --bg-surface-subtle: var(--bg-surface-subtle-light);
    --text-primary: var(--text-primary-light);
    --text-secondary: var(--text-secondary-light);
    --text-muted: var(--text-muted-light);
    --border: var(--border-light);
    --border-strong: var(--border-strong-light);
    --accent: var(--accent-light);
    --accent-hover: var(--accent-hover-light);
    --accent-surface: var(--accent-surface-light);
    --badge-bg: var(--badge-bg-light);
    --badge-text: var(--badge-text-light);
    --notice-bg: var(--notice-bg-light);
    --shadow: var(--shadow-light);
  }

  @media (prefers-color-scheme: dark) {
    :root {
      --bg-canvas: var(--bg-canvas-dark);
      --bg-surface: var(--bg-surface-dark);
      --bg-surface-subtle: var(--bg-surface-subtle-dark);
      --text-primary: var(--text-primary-dark);
      --text-secondary: var(--text-secondary-dark);
      --text-muted: var(--text-muted-dark);
      --border: var(--border-dark);
      --border-strong: var(--border-strong-dark);
      --accent: var(--accent-dark);
      --accent-hover: var(--accent-hover-dark);
      --accent-surface: var(--accent-surface-dark);
      --badge-bg: var(--badge-bg-dark);
      --badge-text: var(--badge-text-dark);
      --notice-bg: var(--notice-bg-dark);
      --shadow: var(--shadow-dark);
    }
  }
}

/* ==========================================================================
   CSS Reset & Grundstile
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-family);
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scrollbar-gutter: stable;
  scroll-behavior: smooth;
}

body {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* ==========================================================================
   Layout-Container
   ========================================================================== */

.page-wrapper {
  inline-size: 100%;
  max-inline-size: var(--container-width);
  margin-inline: auto;
  padding-inline: 1.25rem;
  padding-block: 2rem 4rem;
  flex: 1;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.site-header {
  border-block-end: 1px solid var(--border);
  background-color: var(--bg-surface);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.header-inner {
  max-inline-size: var(--container-width);
  margin-inline: auto;
  padding-inline: 1.25rem;
  padding-block: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.brand-icon {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  background: linear-gradient(135deg, var(--accent), #5856d6);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 700;
  font-size: 0.95rem;
}

.site-nav {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition-speed) ease, background-color var(--transition-speed) ease;
}

.nav-link:hover {
  color: var(--text-primary);
  background-color: var(--bg-surface-subtle);
}

.nav-link.active {
  color: var(--accent);
  background-color: var(--accent-surface);
  font-weight: 500;
}

/* ==========================================================================
   Karten & Container (Cards)
   ========================================================================== */

.card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-block-end: 2rem;
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 2.5rem 2rem;
  margin-block-end: 2rem;
  text-align: left;
}

/* ==========================================================================
   Typografie
   ========================================================================== */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background-color: var(--badge-bg);
  color: var(--badge-text);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  margin-block-end: 1rem;
}

h1 {
  font-size: clamp(1.85rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin-block-end: 0.75rem;
  color: var(--text-primary);
}

h2 {
  font-size: 1.45rem;
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.015em;
  margin-block-start: 2rem;
  margin-block-end: 0.75rem;
  color: var(--text-primary);
  border-block-end: 1px solid var(--border);
  padding-block-end: 0.4rem;
}

h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-block-start: 1.5rem;
  margin-block-end: 0.5rem;
  color: var(--text-primary);
}

p {
  color: var(--text-secondary);
  margin-block-end: 1rem;
  font-size: 1rem;
}

.lead-text {
  font-size: 1.125rem;
  line-height: 1.55;
  color: var(--text-primary);
  margin-block-end: 1rem;
}

.meta-text {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-block-end: 0;
}

/* ==========================================================================
   Links & Buttons
   ========================================================================== */

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
  transition: color var(--transition-speed) ease;
}

a:hover {
  color: var(--accent-hover);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background-color: var(--accent);
  color: #ffffff !important;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-speed) ease, transform 0.1s ease;
  box-shadow: 0 2px 8px rgba(0, 113, 227, 0.25);
  margin-block-start: 0.5rem;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--bg-surface-subtle);
  color: var(--text-primary) !important;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: background-color var(--transition-speed) ease;
}

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

.button-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-block: 1rem;
}

/* ==========================================================================
   Listen & Aufzählungen
   ========================================================================== */

ul, ol {
  padding-inline-start: 1.5rem;
  margin-block-end: 1.25rem;
  color: var(--text-secondary);
}

li {
  margin-block-end: 0.4rem;
}

li strong {
  color: var(--text-primary);
}

/* ==========================================================================
   Info- & Hinweisboxen (Callouts)
   ========================================================================== */

.notice-box {
  background-color: var(--notice-bg);
  border-inline-start: 4px solid var(--accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1.25rem 1.5rem;
  margin-block: 1.5rem;
  border-block: 1px solid var(--border);
  border-inline-end: 1px solid var(--border);
}

.notice-box p:last-child {
  margin-block-end: 0;
}

.notice-title {
  font-weight: 600;
  color: var(--text-primary);
  margin-block-end: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.placeholder-pill {
  display: inline-block;
  background-color: var(--badge-bg);
  color: var(--badge-text);
  padding: 0.1rem 0.45rem;
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.85em;
  border: 1px dashed var(--accent);
}

/* ==========================================================================
   Feature- & Info-Grid (z.B. für Support-Themen)
   ========================================================================== */

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-block: 1.5rem;
}

.grid-item {
  background-color: var(--bg-surface-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.grid-item h3 {
  margin-block-start: 0;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.grid-item p {
  font-size: 0.95rem;
  margin-block-end: 0;
}

/* ==========================================================================
   FAQ Accordion (<details> & <summary>)
   ========================================================================== */

.faq-list {
  margin-block: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

details {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background-color: var(--bg-surface);
  overflow: clip;
  transition: border-color var(--transition-speed) ease;
}

details[open] {
  border-color: var(--border-strong);
}

summary {
  padding: 1rem 1.25rem;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  list-style: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "+";
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--accent);
  transition: transform var(--transition-speed) ease;
}

details[open] summary::after {
  transform: rotate(45deg);
}

.details-content {
  padding: 0 1.25rem 1.25rem 1.25rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  border-block-start: 1px solid var(--border);
  padding-block-start: 1rem;
}

.details-content p:last-child {
  margin-block-end: 0;
}

/* ==========================================================================
   Inhaltsverzeichnis (Table of Contents)
   ========================================================================== */

.toc-card {
  background-color: var(--bg-surface-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin-block: 1.5rem 2rem;
}

.toc-title {
  font-size: 0.95rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-block-end: 0.75rem;
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.5rem 1.5rem;
}

.toc-list a {
  text-decoration: none;
  font-size: 0.925rem;
  color: var(--text-secondary);
}

.toc-list a:hover {
  color: var(--accent);
  text-decoration: underline;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  border-block-start: 1px solid var(--border);
  background-color: var(--bg-surface);
  padding-block: 2rem;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.footer-inner {
  max-inline-size: var(--container-width);
  margin-inline: auto;
  padding-inline: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-links {
  display: flex;
  gap: 1.25rem;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--text-primary);
  text-decoration: underline;
}

/* ==========================================================================
   Druck-Stile
   ========================================================================== */

@media print {
  body {
    background: #ffffff;
    color: #000000;
  }
  .site-header, .site-footer, .button-group, .toc-card {
    display: none !important;
  }
  .card {
    box-shadow: none !important;
    border: none !important;
    padding: 0 !important;
  }
  a {
    color: #000000;
    text-decoration: none;
  }
}