@import url("https://fonts.googleapis.com/css2?family=Anton&family=Inter:wght@300;400;600&display=swap");

:root {
  --ff-heading: "Anton", "Helvetica Neue", Arial, sans-serif;
  --ff-body: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

h1,
h2,
.logo {
  font-family: var(--ff-heading);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 400;
  line-height: 120%;
  font-size: clamp(2rem, 4vw, 5rem);
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.6), 0 0 8px rgba(255, 120, 20, 0.08);
}

h3 {
  font-family: var(--ff-heading);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 400;
  font-size: clamp(1.25rem, 4vw, 2rem);
  line-height: 150%;
}

body,
p,
.btn {
  font-family: var(--ff-body);
  line-height: 150%;
  font-size: 1rem;
}

.row {
  margin-left: 0px;
  margin-right: 0px;
}

.jumbo {
  background-image: url("gp2-5-1.jpg");
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  height: 100%;
  padding: 8% 0;
}

.jumbo2 {
  background-image: url("gp1-1.jpg");
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
}

.kapsa {
  background-image: url("kapsa.jpg");
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  height: 480px;
}

.parallax {
  background-image: url("back4.jpg");
  min-height: 500px;
  background-attachment: fixed;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}

#btn-back-to-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: none;
  z-index: 10;
}

/* --- animace underline start--- */

nav {
  transition: linear 0.25s;
  background-color: rgba(255, 255, 255, 1);
  margin-top: -31px;
  border-left: 15px solid #0d6efd;
  border-right: 15px solid #0d6efd;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

nav.at-top {
  background-color: rgba(255, 255, 255, 1);

  transition: linear 0.25s;
  width: 100% !important;
  opacity: 1;
}

.navbar-nav a {
  position: relative;
  text-decoration: none; /* vypnout default underline */
  font-weight: bold;
  color: black;
}

.navbar-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0; /* odsazení pod text */
  width: 100%;
  height: 3px; /* tloušťka čáry */
  background: currentColor; /* stejné jako barva textu */
  transform: scaleX(0); /* schované */
  transform-origin: left; /* začíná vlevo */
  transition: transform 0.3s ease;
}

.navbar-nav a:hover::after {
  transform: scaleX(1); /* postupně se objeví */
}

@media (min-width: 576px) {
  .navbar-expand-sm .navbar-nav .nav-link {
    padding-right: 0;
    padding-left: 0;
    padding-bottom: 6px;
  }
}

/* zrusi podtrzeni */
@media (max-width: 575.98px) {
  .navbar-nav a::after {
    display: none;
  }
}

/* Hamburger - 3 čáry */
.navbar-toggler {
  border: none;
  width: 30px;
  height: 24px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: none !important; /* zruší focus ring */
}

/* Hamburger čáry */
.navbar-toggler span,
.navbar-toggler span::before,
.navbar-toggler span::after {
  display: block;
  position: absolute;
  width: 100%;
  height: 3px;
  background-color: #333;
  border-radius: 2px;
  transition: transform 0.4s ease, opacity 0.4s ease;
}

.navbar-toggler span {
  top: 50%;
  transform: translateY(-50%);
}

.navbar-toggler span::before {
  content: "";
  top: -10px;
}

.navbar-toggler span::after {
  content: "";
  top: 10px;
}

/* Po otevření menu → křížek */
.navbar-toggler:not(.collapsed) span {
  background-color: transparent; /* střední čára zmizí */
}

.navbar-toggler:not(.collapsed) span::before {
  transform: rotate(45deg) translate(5px, 4px);
}

.navbar-toggler:not(.collapsed) span::after {
  transform: rotate(-45deg) translate(10px, -10px);
}

/* --- fader start--- */

.tag {
  opacity: 0;
  transition-property: all;
  transition-timing-function: ease-out;
}

/* čistý fade-in bez pohybu */
.fadein {
  transform: none;
  transition-duration: 0.8s; /* střední */
}

/* fade-in směr + vlastní rychlost */
.from-bottom {
  transform: translateY(10vh);
  transition-duration: 0.6s; /* střední */
}
.from-top {
  transform: translateY(-10vh);
  transition-duration: 0.4s; /* rychlejší */
}
.from-left {
  transform: translateX(-10vw);
  transition-duration: 0.9s; /* pomalejší */
}
.from-right {
  transform: translateX(10vw);
  transition-duration: 0.7s;
}

.visible {
  opacity: 1;
  transform: translate(0, 0);
}
/* --- fader konec --- */

@media (min-width: 768px) {
  .opacity-lg-0 {
    background-color: transparent !important; /* zruší bg-dark */
  }
}

@media (max-width: 575.98px) {
  .jumbo {
    margin-top: 40px;
  }

  nav.sticky-top {
    position: absolute;
    margin-top: 0;
    width: 100%;
  }

  nav {
    border-left: 7px solid #0d6efd;
    border-right: 7px solid #0d6efd;
  }
}