/*
 * Copyright 2020  Kazimierz Pogoda
 *
 * This file is part of shader-web-background.
 *
 * shader-web-background is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * shader-web-background is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with shader-web-background.  If not, see <https://www.gnu.org/licenses/>.
 */

html {
  box-sizing: border-box;
  background: black;
  font-size: calc(10px + .5vw);
  font-family: sans-serif;
  scroll-behavior: smooth;
  line-height: 1.4em;
}

*, *:before, *:after {
  box-sizing: inherit;
}

body, h1, pre {
  margin: 0;
  padding: 0;
}

header {
  height: 100vh;
  overflow: hidden; /* in case logo is too big on a small screen */
  display: flex;
  align-items: center;
  justify-content: center;
  /* switch off text selection on header */
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

header h1 {
  text-transform: lowercase;
  color: rgba(255, 255, 255, .8);
  text-align: center;
  font-size: calc(50px + 6vw);
  font-weight: normal;
  word-spacing: 100vw; /* will make sure that each word is in separate line */
  line-height: .4em;
  text-shadow: 0px .03em .06em black;
  animation: fade-in 6s;
  animation-fill-mode: both;
}

header h1 a {
  text-decoration: none;
  color: rgba(255, 255, 255, .8);
}

@keyframes fade-in {
  0%   {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

section {
  background: rgba(0, 0, 0, .4);
  font-size: 1.6rem;
}

#controls {
  text-align: center;
  line-height: 4em;
}

button {
  background: rgba(255, 0, 255, .5);
  border: none;
  color: white;
  padding: 1rem;
  text-align: center;
  font-size: inherit;
  transition: color 1.6s, background 1.6s;
  border-radius: .47rem;
  cursor: pointer;
}

button:hover {
  background: rgba(255, 255, 255, .5);
  color: black;
}

.shader-web-background-fallback {
  background: red;
}

.shader-web-background-fallback h1::after {
  color: red;
  content: " shader-web-background not supported"
}