/* ───────────────────────────────────────────────────────────────
   Base-CSS — 1:1 aus _Webseiten-Blueprint/skeleton/css/base.css
   Reset, Typografie-Skala, Layout-Utilities.
   Erwartet, dass tokens.css bereits geladen ist.
   ─────────────────────────────────────────────────────────────── */

/* ── Minimal Reset ──────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  /* Fixer Header verdeckt sonst die Ziel-Überschrift bei Anker-Sprüngen
     (z. B. /seminare#kinder-jugend aus der Nav). Offset = Header-Höhe + Luft. */
  scroll-padding-top: calc(var(--nav-h) + 1rem);
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

button {
  cursor: pointer;
  border: 0;
  background: none;
  padding: 0;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* ── Typografie-Skala (Fluid) ──────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.25;
  margin: 0 0 0.6em;
  color: var(--color-text);
}

h1 { font-size: clamp(2rem, 4vw, 3rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.6rem); }
h3 { font-size: clamp(1.3rem, 2.5vw, 1.8rem); }
h4 { font-size: 1.1rem; line-height: 1.4; }

p { margin: 0 0 1em; }

.label, small {
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-soft);
}

/* ── Skip-to-Content (A11y) ────────────────────────────────────── */
.skip-to-content {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-text);
  color: var(--color-bg);
  padding: 0.5rem 1rem;
  z-index: 10000;
}
.skip-to-content:focus {
  left: 0;
}

/* ── Container ─────────────────────────────────────────────────── */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

section {
  padding: clamp(3rem, 8vw, 6rem) 0;
}

/* ── Grid Utility ──────────────────────────────────────────────── */
.grid {
  display: grid;
  gap: 2rem;
}
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* ── Buttons ───────────────────────────────────────────────────── */
.btn-primary, .btn-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.9rem 1.8rem;
  background: var(--color-accent);
  color: var(--color-bg);
  border-radius: var(--radius-pill);
  font-weight: 600;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}
.btn-primary:hover, .btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-accent);
  background: var(--color-accent-hover);
  color: var(--color-bg);
}
/* Physisches Drücken: kurzer Scale-Down beim Klick */
.btn-primary:active, .btn-cta:active {
  transform: translateY(0) scale(0.98);
  transition-duration: 0.1s;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.8rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-pill);
  color: var(--color-text);
  font-weight: 600;
  transition: border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}
.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}
.btn-secondary:active {
  transform: translateY(0) scale(0.98);
  transition-duration: 0.1s;
}

/* ── Scroll-Reveal Utility ─────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s cubic-bezier(0.22, 1, 0.36, 1), transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
}
/* Wer schnell tabbt, ueberholt die Scroll-Animation: 21 von 60 Tab-Stopps auf der
   Startseite lagen im Moment des Fokus noch bei opacity 0, der Fokusring war also
   unsichtbar (Audit 2026-08-30). Sobald etwas darin Fokus bekommt, sofort zeigen. */
.reveal:focus-within {
  opacity: 1 !important;
  transform: none !important;
  transition: none;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }

/* Auto-Stagger: Karten in Grids laufen nacheinander ein (60-ms-Kaskade).
   Greift nur, wenn mehrere Karten gleichzeitig in den Viewport treten. */
:is(.seminare-grid, .zt-grid, .team-teaser__grid, .trainer-grid, .kooperation-grid,
    .seminar-module-grid, .zt-angebote-grid) > .reveal:nth-child(2) { transition-delay: 60ms; }
:is(.seminare-grid, .zt-grid, .team-teaser__grid, .trainer-grid, .kooperation-grid,
    .seminar-module-grid, .zt-angebote-grid) > .reveal:nth-child(3) { transition-delay: 120ms; }
:is(.seminare-grid, .zt-grid, .team-teaser__grid, .trainer-grid, .kooperation-grid,
    .seminar-module-grid, .zt-angebote-grid) > .reveal:nth-child(4) { transition-delay: 180ms; }
:is(.seminare-grid, .zt-grid, .team-teaser__grid, .trainer-grid, .kooperation-grid,
    .seminar-module-grid, .zt-angebote-grid) > .reveal:nth-child(5) { transition-delay: 240ms; }
:is(.seminare-grid, .zt-grid, .team-teaser__grid, .trainer-grid, .kooperation-grid,
    .seminar-module-grid, .zt-angebote-grid) > .reveal:nth-child(6) { transition-delay: 300ms; }
:is(.seminare-grid, .zt-grid, .team-teaser__grid, .trainer-grid, .kooperation-grid,
    .seminar-module-grid, .zt-angebote-grid) > .reveal:nth-child(n+7) { transition-delay: 360ms; }

/* Reduced Motion: Reveals sofort sichtbar, keine Verzögerungen */
@media (prefers-reduced-motion: reduce) {
  .reveal, .text-reveal span { transition: none !important; }
  .reveal { opacity: 1; transform: none; }
  .text-reveal span { transform: none; }
}

/* ── Visually-Hidden (A11y) ────────────────────────────────────── */
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ── Sichtbarer Tastatur-Fokus (BFSG / WCAG 2.4.7) ─────────────── */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}
/* Maus-Interaktion ohne Ring, Tastatur mit */
:focus:not(:focus-visible) {
  outline: none;
}

/* ── Ungültige Formularfelder sichtbar markieren ───────────────── */
input[aria-invalid="true"], textarea[aria-invalid="true"] {
  border-color: #E07A5F;
  box-shadow: 0 0 0 2px rgba(224, 122, 95, 0.25);
}

/* ── Reduzierte Bewegung respektieren (WCAG 2.3.3 / Vestibular) ── */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}