/* =========================================================================
   Base — Reset, Typography, Body, Focus
   ========================================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-6);
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--body-md);
  line-height: var(--leading-normal);
  color: var(--on-surf);
  background: var(--surf-container-low);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: var(--fw-semibold);
  line-height: var(--leading-tight);
  color: var(--on-surf);
}

p {
  margin: 0;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--motion-short) var(--md-easing-standard);
}

a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
  text-underline-offset: 2px;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

hr {
  border: 0;
  border-top: 1px solid var(--divider);
  margin: var(--space-4) 0;
}

blockquote {
  margin: 0;
}

/* Focus-Ring (durchgängig sichtbar) */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: var(--radius-xs);
}

/* Selection */
::selection {
  background: var(--primary-container);
  color: var(--on-primary-container);
}

/* Skip-Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-3);
  z-index: var(--z-header);
  padding: var(--space-2) var(--space-4);
  background: var(--primary);
  color: var(--on-primary);
  border-radius: var(--radius-sm);
  font-size: var(--label-lg);
  font-weight: var(--fw-medium);
  transition: top var(--motion-short) var(--md-easing-decelerate);
}

.skip-link:focus-visible {
  top: var(--space-3);
  text-decoration: none;
  color: var(--on-primary);
}

/* Material Symbols sizing-Hilfen */
.material-symbols-rounded {
  font-variation-settings: "FILL" 0, "wght" 400, "GRAD" 0, "opsz" 24;
  user-select: none;
  vertical-align: middle;
}

.material-symbols-rounded[aria-hidden="true"] {
  pointer-events: none;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* View Transition fuer Theme-Wechsel — MD3-Crossfade ueber 250 ms.
   Browser ohne ::view-transition-* Support fallen auf den Snap zurueck. */
::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 250ms;
  animation-timing-function: cubic-bezier(0.2, 0, 0, 1);
}

/* Section-Reveal-on-Scroll: nur im js-motion Modus (nicht bei
   prefers-reduced-motion und nicht bei deaktiviertem JS). Section
   startet leicht versetzt + transparent, fadet beim ersten Intersect
   in den finalen Zustand. */
html.js-motion .section {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--motion-medium) var(--md-easing-decelerate),
              transform var(--motion-medium) var(--md-easing-decelerate);
  will-change: opacity, transform;
}

html.js-motion .section.is-visible {
  opacity: 1;
  transform: none;
}

/* Timeline-Item Stagger: wenn die Section sichtbar wird, cascaden
   die Items mit 60 ms Versatz pro Item. Auf display:contents Items
   targeten wir die Children direkt, damit Transform/Opacity sicher
   gerendert werden. Cap bei nth-child(6+), damit die Gesamtdauer
   nicht ausartet (10+ Items wuerden sonst > 600 ms staffeln). */
html.js-motion .timeline--alt > .timeline__item > * {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--motion-medium) var(--md-easing-decelerate),
              transform var(--motion-medium) var(--md-easing-decelerate);
}

html.js-motion .section.is-visible .timeline--alt > .timeline__item > * {
  opacity: 1;
  transform: none;
}

html.js-motion .timeline--alt > .timeline__item:nth-child(1) > * { transition-delay: 0ms; }
html.js-motion .timeline--alt > .timeline__item:nth-child(2) > * { transition-delay: 60ms; }
html.js-motion .timeline--alt > .timeline__item:nth-child(3) > * { transition-delay: 120ms; }
html.js-motion .timeline--alt > .timeline__item:nth-child(4) > * { transition-delay: 180ms; }
html.js-motion .timeline--alt > .timeline__item:nth-child(5) > * { transition-delay: 240ms; }
html.js-motion .timeline--alt > .timeline__item:nth-child(n+6) > * { transition-delay: 300ms; }