:root {
  --bg-color: #0f1115;
  --primary-color: #f5c518;
  --secondary-color: #b3b3b3;
  --accent-color: #ffffff;
  --border-subtle: #1e2128;
  --my-box-shadow: 0.25rem 0.25rem var(--primary-color);
}

/*START RESETY*/
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  /* outline: 1px solid red; */
}

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

html {
  scrollbar-gutter: stable both-edges;
  scrollbar-color: var(--primary-color) var(--bg-color);
}
/*KONEC RESETY*/

body {
  font-size: 16px;
  font-family: 'Helvetica';
  color: var(--secondary-color);
  line-height: 1.5;
  background: var(--bg-color);
  -webkit-font-smoothing: antialiased;
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100vh;
  min-height: 100dvh;
  grid-template-areas:
    'header'
    'main'
    'footer';
}

body > header {
  grid-area: header;
  height: 6.25rem;
  width: 100%;
  background: var(--bg-color);
  color: var(--accent-color);
  border-bottom: 1px solid var(--border-subtle);
  position: fixed;
  top: 0;
  z-index: 1;
  display: flex;
  align-items: center;
}

#logo {
  height: 2.5rem;
  margin: auto auto auto 2rem;
  padding-left: 3rem;

  display: flex;
  flex-direction: column;
  justify-content: center;

  background: url(/images/logo.png) no-repeat;
  background-size: 40px 40px;

  text-decoration: none;
  color: var(--accent-color);
}

#logo:hover,
#logo:focus-visible {
  color: var(--primary-color);
}

#logo h1 {
  font-weight: normal;
  font-size: 1.5rem;
  line-height: 1.2rem;
  color: inherit; /* důležité */
}

#logo small {
  margin-top: 0.2rem;
  text-transform: uppercase;
  font-size: 0.85rem;
  color: inherit;
  letter-spacing: 0.1rem;
}

#logo h1 span {
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: -0.1rem;
}

nav {
  margin: 0 2rem 0 0;
}

nav ul {
  list-style-type: none;
  display: flex;
  flex-direction: row;
}

nav ul li:not(:last-child) {
  padding-right: 3rem;
}

nav ul li {
  font-size: 1rem;
}

nav ul li a {
  text-decoration: none;
  text-transform: uppercase;
  color: var(--accent-color);
  padding: 0.5rem 0;
}

nav ul a:hover,
nav ul a:focus,
.active a {
  border-bottom: 2px solid var(--primary-color);
}

.kontakt-tlacitko {
  background: var(--primary-color);
  color: var(--bg-color);
  padding: 0.5rem 1.25rem;
  border-radius: 1.25rem;
}

.kontakt-tlacitko:hover,
.reference-tlacitko:hover {
  filter: brightness(115%) contrast(85%);
  border: 0;
}

main {
  grid-area: main;
  margin: 6.25rem auto auto auto;
  max-width: clamp(48rem, 90vw, 80rem);
  width: 100%;
}

footer {
  grid-area: footer;
  margin-top: 2rem;
  display: flex;
  height: 2rem;
  text-align: center;
  color: var(--secondary-color);
  border-top: 1px solid var(--border-subtle);
  justify-content: center;
  align-items: center;
  font-size: 0.8rem;
  width: 100%;
}

.avatar {
  width: 300px;
  float: right;
  margin-left: 2rem;
  filter: grayscale(0.3);
  border-radius: 1rem;
  border-width: 2px;
  border-style: solid;
  border-color: var(--primary-color);
}

article {
  margin: 0 auto;
  padding: 3.125rem 3.125rem 0.625rem 3.125rem;
}

article header {
  height: 5rem;
}

article h1,
article h2,
article h3 {
  color: var(--accent-color);
  padding: 0.625rem 0;
}

article h1 {
  font-size: 2.3rem;
  font-weight: bold;
  text-transform: uppercase;
  width: max-content;
  text-decoration: underline 4px var(--primary-color);
  text-underline-offset: 1.5rem;
}

article h2 {
  font-size: 1.5rem;
  text-transform: uppercase;
  width: max-content;
  text-decoration: underline 2px var(--primary-color);
  text-underline-offset: 1rem;
}

article section p {
  margin-top: 1.5rem;
  line-height: 1.8em;
}

article a {
  color: var(--primary-color);
}

.clear {
  clear: both;
}

.reference-tlacitko {
  background: var(--primary-color);
  color: var(--bg-color);
  font-size: 0.9em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.75rem 1.5rem;
  border-radius: 1.5rem;
}

.contact-flex {
  display: flex;
  margin: 2rem auto;
  max-width: 60rem;
  justify-content: space-around;
  border-top: 1px solid var(--primary-color);
  border-bottom: 1px solid var(--primary-color);
}

.contact-flex i {
  color: var(--primary-color);
  font-size: 4rem;
  line-height: normal;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  transition: 800ms ease;

  &:hover {
    background-color: var(--primary-color);
    color: var(--bg-color);
    transform: translateY(-0.8rem) scale(1.02);
    box-shadow:
      10px 10px var(--bg-color),
      12px 12px var(--primary-color);
  }
}

.dovednosti-reference-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr));
  gap: 2rem 2rem;
  margin-top: 2rem;
  margin-bottom: 3rem;
  a {
    color: var(--secondary-color);
    text-decoration: none;
  }
}

.dovednosti-reference-card {
  border: 2px solid var(--secondary-color);
  padding: 1rem;
  border-radius: 1.5rem;
  transition: transform 800ms ease;

  img {
    margin: auto;
  }

  h2,
  h3 {
    text-align: center;
  }

  &:hover {
    transform: translateY(-10px) scale(1.02);
    border: 2px solid var(--primary-color);
    transition: 800ms;
    box-shadow:
      10px 10px var(--bg-color),
      12px 12px var(--primary-color);
  }
}

/* Hamburger + mobile dialog menu */
.hamburger {
  display: none;
  margin-left: auto;
  margin-right: 2rem;
  background: transparent;
  border: 0;
  color: var(--accent-color);
  font-size: 2.5rem;
  cursor: pointer;
}

.mobile-menu {
  margin-left: auto;
  width: min(90vw, auto-fill);
  padding: 1.5rem;
  border: 1px solid var(--primary-color);
  border-radius: 1rem;
  background-color: var(--bg-color);
  color: var(--accent-color);
}

.mobile-menu::backdrop {
  background: rgba(0, 0, 0, 0.55);
}

.mobile-menu-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.mobile-menu-close {
  background: transparent;
  border: 0;
  cursor: pointer;
  font-size: 1.5rem;
  color: var(--accent-color);
}

.mobile-menu-links {
  display: grid;
  gap: 1rem;
  margin-top: 1rem;
}

.mobile-menu-links a {
  text-decoration: none;
  text-transform: uppercase;
  color: var(--secondary-color);
  padding: 0.2rem 0.2;
}

.mobile-menu-links a:hover,
.mobile-menu-links a:focus {
  color: var(--primary-color);
}

@media (max-width: 48rem) {
  body > header {
    height: 6.25rem;
  }

  nav {
    display: none;
  }

  .hamburger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .kontakt-tlacitko {
    background: var(--accent-color);
    padding: 0.5rem 1.25rem;
    border-radius: 1.25rem;
  }

  .avatar {
    margin-left: 0;
  }
}

@keyframes appear {
  from {
    opacity: 0;
    scale: 0.5;
  }

  to {
    opacity: 1;
    scale: 1;
  }
}