/* ============================================================================
   BASE  —  moderní reset + základní typografie a prvky  (v2.1)
   ============================================================================ */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + var(--space-5));
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  overflow-x: clip;
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  color: var(--color-body);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1 0 auto; }

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-ink);
  line-height: var(--lh-tight);
  font-weight: var(--fw-bold);
  letter-spacing: -0.02em;
  text-wrap: balance;
}
h1 { font-size: var(--fs-3xl); }
h2 { font-size: var(--fs-2xl); }
h3 { font-size: var(--fs-xl); }
h4 { font-size: var(--fs-lg); }

p { line-height: var(--lh-normal); }

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--color-primary-dark); }

ul, ol { padding-left: 1.25rem; }
strong { font-weight: var(--fw-bold); color: var(--color-ink); }

hr {
  border: 0;
  border-top: 1px solid var(--color-line);
  margin: var(--space-6) 0;
}

::selection {
  background: var(--color-primary);
  color: #fff;
}

:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

:target { scroll-margin-top: calc(var(--header-h) + var(--space-5)); }

/* Skip-link */
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--color-ink); color: #fff;
  padding: var(--space-3) var(--space-5);
  border-radius: 0 0 var(--radius) 0;
}
.skip-link:focus { left: 0; color: #fff; }

/* ---- Utility ---- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-5);
}
.container--narrow { max-width: var(--container-narrow); }

.section { padding-block: var(--space-9); }
.section--tight { padding-block: var(--space-7); }
.section--surface { background: var(--color-surface); }

.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;
}
.text-center { text-align: center; }
.is-hidden { display: none !important; }

/* ---- Reveal animace ---- */
.reveal-on [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
  will-change: opacity, transform;
}
.reveal-on [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}
/* Staggered delay pro mřížky */
.reveal-on [data-reveal-delay="1"] { transition-delay: 0.1s; }
.reveal-on [data-reveal-delay="2"] { transition-delay: 0.2s; }
.reveal-on [data-reveal-delay="3"] { transition-delay: 0.3s; }