/* ==========================================================================
   base.css – Basis-Stylesheet (fach-agnostisch)

   Moderner CSS-Reset, Custom Properties, Grundlayout, Utility-Klassen.
   Theme-Dateien (z.B. theme-gpg.css) ueberschreiben die Custom Properties.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS-Reset
   -------------------------------------------------------------------------- */

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

html {
  font-size: 100%; /* 16px Basis */
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  font-family: var(--font-heading);
}

/* --------------------------------------------------------------------------
   2. CSS Custom Properties (Defaults – ueberschreibbar durch Themes)
   -------------------------------------------------------------------------- */

:root {
  /* Farben (neutrale Defaults – werden durch Theme-Dateien ueberschrieben) */
  --color-primary: #333333;
  --color-secondary: #666666;
  --color-background: #ffffff;
  --color-surface: #f5f5f5;
  --color-text: #222222;
  --color-success: #2D6A4F;
  --color-error: #9B2226;
  --color-tipp: #4A6FA5;

  /* Typografie (neutrale Defaults) */
  --font-heading: system-ui, -apple-system, sans-serif;
  --font-body: system-ui, -apple-system, sans-serif;
  --font-code: "Courier New", monospace;

  /* Schriftgroessen */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;

  /* Abstaende */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Rundungen */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Schatten */
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-elevated: 0 4px 16px rgba(0, 0, 0, 0.15);

  /* Uebergaenge */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;

  /* Layout */
  --max-width: 960px;
  --max-width-wide: 1400px;
  --content-padding: var(--space-md);

  /* Borders */
  --color-border: #e0e0e0;
  --color-muted: #666666;
  --color-surface-warm: #fdf6e3;
}

/* --------------------------------------------------------------------------
   3. Grundlayout
   -------------------------------------------------------------------------- */

body {
  display: flex;
  flex-direction: column;
}

header {
  padding: var(--space-lg) var(--content-padding);
}

main {
  flex: 1;
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding: var(--space-lg) var(--content-padding);
}

nav {
  padding: var(--space-sm) var(--content-padding);
}

footer {
  padding: var(--space-md) var(--content-padding);
  text-align: center;
  font-size: var(--text-sm);
}

/* --------------------------------------------------------------------------
   4. Interaktive Elemente – Touch-Targets & Fokus
   -------------------------------------------------------------------------- */

/* Touch-Targets: Minimum 48x48px */
button,
[role="button"],
input[type="radio"],
input[type="checkbox"],
select,
a {
  min-height: 48px;
  min-width: 48px;
}

input[type="text"],
input[type="password"],
textarea,
select {
  min-height: 48px;
  padding: var(--space-sm) var(--space-md);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-sm);
  background: #fff;
  font-size: var(--text-base); /* Verhindert iOS-Zoom */
}

/* Sichtbare Fokus-Outlines */
:focus-visible {
  outline: 3px solid var(--color-secondary);
  outline-offset: 2px;
}

/* Fokus-Ring nur bei Keyboard-Navigation */
:focus:not(:focus-visible) {
  outline: none;
}

/* --------------------------------------------------------------------------
   5. Utility-Klassen
   -------------------------------------------------------------------------- */

/* Visuell versteckt, aber fuer Screenreader zugaenglich */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Scroll-Lock (z.B. bei Modal) */
.no-scroll {
  overflow: hidden;
}

/* Fade-In-Animation */
.fade-in {
  animation: fadeIn var(--transition-normal) ease-in;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* Text-Ausrichtung */
.text-center { text-align: center; }
.text-left   { text-align: left; }
.text-right  { text-align: right; }

/* --------------------------------------------------------------------------
   6. Responsive Breakpoints
   -------------------------------------------------------------------------- */

/* Mobile (< 640px) – Standard / Mobile-First */

/* Tablet (640px – 1024px) */
@media (min-width: 640px) {
  :root {
    --content-padding: var(--space-lg);
  }

  main {
    padding: var(--space-xl) var(--content-padding);
  }
}

/* Desktop (> 1024px) */
@media (min-width: 1024px) {
  :root {
    --content-padding: var(--space-xl);
    --max-width: 1100px;
  }
}

/* --------------------------------------------------------------------------
   7. Print-Reset
   -------------------------------------------------------------------------- */

@media print {
  *,
  *::before,
  *::after {
    background: transparent !important;
    color: #000 !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }

  body {
    font-size: 12pt;
    line-height: 1.4;
  }

  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
  }

  /* Seitenumbrueche */
  h1, h2, h3 {
    page-break-after: avoid;
  }

  section, article {
    page-break-inside: avoid;
  }

  /* Interaktive Elemente im Druck ausblenden */
  button,
  input,
  select,
  textarea,
  .no-print {
    display: none !important;
  }
}

/* --------------------------------------------------------------------------
   8. Reduzierte Bewegung (prefers-reduced-motion)
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}