/* =========================================================
   Martin Knotek - knotek.info
   Design tokens, light/dark theme, responsive layout.
   ========================================================= */

/* --- Design tokens: light (default) ---------------------- */
:root {
  color-scheme: light dark;

  --bg:            #f7f7f5;
  --bg-elevated:   #ffffff;
  --bg-subtle:     #eeeeea;
  --text:          #1b2227;
  --text-muted:    #5c666e;
  --border:        #dcdcd4;
  --accent:        #2f6f4e;
  --accent-hover:  #245b3e;
  --accent-contrast: #ffffff;
  --focus:         #2f6f4e;
  --shadow:        0 1px 2px rgb(0 0 0 / 6%), 0 8px 24px -12px rgb(0 0 0 / 18%);

  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;

  --radius: 14px;
  --radius-sm: 8px;
  --measure: 62ch;
  --page: 68rem;
  --gap: clamp(1rem, 3vw, 2rem);
}

/* --- Design tokens: dark --------------------------------- */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:            #101418;
    --bg-elevated:   #171d23;
    --bg-subtle:     #1c2329;
    --text:          #e8edf1;
    --text-muted:    #a0acb6;
    --border:        #2a333b;
    --accent:        #6fc39a;
    --accent-hover:  #8ed6b3;
    --accent-contrast: #0d1114;
    --focus:         #6fc39a;
    --shadow:        0 1px 2px rgb(0 0 0 / 40%), 0 10px 30px -14px rgb(0 0 0 / 70%);
  }
}

:root[data-theme="dark"] {
  --bg:            #101418;
  --bg-elevated:   #171d23;
  --bg-subtle:     #1c2329;
  --text:          #e8edf1;
  --text-muted:    #a0acb6;
  --border:        #2a333b;
  --accent:        #6fc39a;
  --accent-hover:  #8ed6b3;
  --accent-contrast: #0d1114;
  --focus:         #6fc39a;
  --shadow:        0 1px 2px rgb(0 0 0 / 40%), 0 10px 30px -14px rgb(0 0 0 / 70%);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding-inline: clamp(1rem, 5vw, 2.5rem);
  padding-block-start: env(safe-area-inset-top, 0px);
  padding-block-end: env(safe-area-inset-bottom, 0px);
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: clamp(1rem, 0.96rem + 0.2vw, 1.075rem);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
[hidden] { display: none !important; }

h1, h2, h3 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.2;
  text-wrap: balance;
  margin: 0;
}

p { margin: 0; max-width: var(--measure); }

a { color: var(--accent); text-underline-offset: 0.18em; }
a:hover { color: var(--accent-hover); }

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

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

  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* --- Skip link ------------------------------------------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 0.65rem 1rem;
  background: var(--accent);
  color: var(--accent-contrast);
  border-radius: 0 0 var(--radius-sm) 0;
  text-decoration: none;
}
.skip-link:focus { left: 0; }

/* --- Shared page width ----------------------------------- */
.site-header,
main,
.site-footer {
  width: 100%;
  max-width: var(--page);
  margin-inline: auto;
}

/* --- Header ---------------------------------------------- */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding-block: 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: inherit;
  text-decoration: none;
  font-weight: 600;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: var(--accent-contrast);
  font-family: var(--font-serif);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

.brand__name { letter-spacing: 0.01em; }

/* --- Theme toggle ---------------------------------------- */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--text-muted);
  font: inherit;
  font-size: 0.875rem;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background-color 0.15s;
}
.theme-toggle:hover {
  color: var(--text);
  border-color: var(--accent);
}

.theme-toggle__icon {
  width: 1.05rem;
  height: 1.05rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.theme-toggle__icon--moon { fill: currentColor; stroke: none; }

/* Ve svetlem motivu nabizime prepnuti do tmaveho (mesic) a naopak. */
.theme-toggle__icon--sun { display: none; }
:root[data-theme="dark"] .theme-toggle__icon--sun { display: block; }
:root[data-theme="dark"] .theme-toggle__icon--moon { display: none; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle__icon--sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle__icon--moon { display: none; }
}

@media (max-width: 26rem) {
  .theme-toggle__label { display: none; }
  .theme-toggle { padding: 0.55rem; }
}

/* --- Hero ------------------------------------------------ */
.hero {
  display: flex;
  align-items: center;
  gap: clamp(1.5rem, 4vw, 3rem);
  flex-wrap: wrap;
  padding-block: clamp(2rem, 6vw, 4.5rem);
  border-block-start: 1px solid var(--border);
}

.hero__text {
  flex: 1 1 22rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: flex-start;
}

.eyebrow {
  margin: 0;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.hero h1 { font-size: clamp(2.1rem, 1.5rem + 3vw, 3.4rem); }

.lead {
  font-size: 1.1rem;
  color: var(--text-muted);
}

/* --- Sections -------------------------------------------- */
.section {
  padding-block: clamp(2rem, 5vw, 3.5rem);
  border-block-start: 1px solid var(--border);
}

.section h2 { font-size: clamp(1.5rem, 1.2rem + 1vw, 2rem); }

.section__intro {
  margin-block-start: 0.5rem;
  color: var(--text-muted);
}

/* --- Cards ----------------------------------------------- */
.cards {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr));
  gap: var(--gap);
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}
.card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.card__title { font-size: 1.15rem; }

.card__title a {
  text-decoration: none;
  color: var(--text);
}

/* Cela karta je klikatelna, aniz bychom vnorovali odkazy. */
.card__title a::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
}
.card:hover .card__title a { color: var(--accent); }

.card__text { color: var(--text-muted); font-size: 0.95rem; }

.card__meta {
  margin-block-start: auto;
  padding-block-start: 0.5rem;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* --- Footer ---------------------------------------------- */
.site-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  justify-content: space-between;
  padding-block: 2rem 3rem;
  margin-block-start: 1rem;
  border-block-start: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.875rem;
}
.site-footer a { color: inherit; }
.site-footer a:hover { color: var(--accent); }

/* --- Print ----------------------------------------------- */
@media print {
  body { background: #fff; color: #000; font-size: 11pt; }
  .theme-toggle, .skip-link { display: none; }
  .card { box-shadow: none; }
  a[href^="http"]::after { content: " (" attr(href) ")"; font-size: 9pt; }
}