/* FONT FAMILIES */

@font-face {
  font-family: 'Roboto';
  src: url('../fonts/roboto/roboto-regular-webfont.woff2') format('woff2'),
    url('../fonts/roboto/roboto-regular-webfont.woff') format('woff');
  font-weight: 400;
  font-style: normal;
}


/* RESET */

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

input,
button,
textarea {
  font: inherit;
}

/* VARIABLES */

:root {

  /* COLORS */
  --BG-FIXED--COLOR: papayawhip;
  --BG-TRANSPARENT--DARK: rgba(0, 0, 0, .8);
  --BG-TRANSPARENT--LIGHT: rgba(181, 180, 138, .9);
  --FIXED__BOX-SHADOW: crimson;

  /* FONTS */
  --FF: 'Roboto', sans-serif;

  --FS-SMALLEST: .55em;
  --FS: 1em;
  --FS-SMALL: 1.2em;
  --FS-MEDIUM: 1.5em;
  --FS-LARGE: 2em;
  --FS-LARGER: 3em;
  --FS-LARGEST: 4em;

  /* SPACINGS */
  --SPACING-SMALLER: .5em;
  --SPACING-SMALL: 1em;
  --SPACING-MEDIUM: 2em;
  --SPACING-LARGE: 4em;
  --SPACING-LARGER: 6em;
}

/* UTILITY CLASSES */

.offscreen {
  position: absolute;
  left: -10000px;
}

.nowrap {
  white-space: nowrap;
}

.center {
  text-align: center;
}

.none {
  display: none;
}

/* GENERAL STYLES */

html {
  max-width: 100vw;
  min-height: 100vh;
  scroll-behavior: smooth;
}

body {
  width: 100%;
  height: 100%;
  min-width: 100px;

  font-family: var(--FF);
  overflow-x: hidden;
  font-size: var(--FS);
}

a,
i {
  text-decoration: none;
  cursor: pointer;
}

img {
  image-rendering: auto;
}


/* ================= SHARED STYLES ================= */

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-direction: row-reverse;

  height: 20vh;
  width: 100%;

  position: fixed;
  top: 0;
  left: 0;
  z-index: 1000;

  background-color: var(--BG-FIXED--COLOR);
  box-shadow: 0 .25em .25em var(--FIXED__BOX-SHADOW);
}

.header-logo {
  display: flex;
  justify-content: center;
  align-items: center;

  height: 100%;
  width: 90%;
}

@-webkit-keyframes header-logo__bg-effect {
  0% {
    background-color: #a50c14;

  }

  25% {
    background-color: #6facdd;
  }

  50% {
    background-color: #e5b951;
  }

  75% {
    background-color: #94bf4e;
  }

  100% {
    background-color: #a50c14;
  }
}

@keyframes header-logo__bg-effect {
  0% {
    background-color: #a50c14;

  }

  25% {
    background-color: #6facdd;
  }

  50% {
    background-color: #e5b951;
  }

  75% {
    background-color: #94bf4e;
  }

  100% {
    background-color: #a50c14;
  }
}

.header-logo a {
  position: relative;
  height: 100%;
  width: 100%;

  display: flex;
  flex-direction: row-reverse;
  align-items: center;
  -moz-column-gap: var(--SPACING-SMALL);
        column-gap: var(--SPACING-SMALL);

  transition: 0.5s;
  padding: var(--SPACING-SMALL);
  pointer-events: none;
  -webkit-animation: header-logo__bg-effect 16s infinite linear;
          animation: header-logo__bg-effect 16s infinite linear;
}

.header-logo a:is(:hover, :focus) {
  -webkit-filter: brightness(1.1);
          filter: brightness(1.1);
}

.header-logo a:active {
  -webkit-filter: brightness(1.15);
          filter: brightness(1.15);
}

.header-logo a img {
  height: 100%;
  width: auto;

  border-radius: 25%;
  pointer-events: all;
}

.header-logo a h1 {
  color: aliceblue;
  font-size: .9em;
}

header>label {
  position: absolute;
  top: var(--SPACING-SMALLER);
  left: var(--SPACING-SMALLER);
}

header input {
  display: none;
}

.header-tabs {
  display: flex;
  flex-direction: column;

  position: absolute;
  top: 0;
  left: 0;
  z-index: 2000;

  height: 100vh;
  width: 90vw;
  max-width: 300px;
  transform: translateX(-100%);

  visibility: hidden;
  opacity: 0;
  overflow: auto;
  padding-bottom: 10vh;
  transition: all 0.5s;
  background: linear-gradient(lightblue, lightgreen, lightskyblue);
  box-shadow: .25em 0 .125em #000;
}

header input:checked+.header-tabs {
  transform: translateX(0);
  visibility: visible;
  opacity: 1;
}

.header-tabs label {
  display: flex;
  justify-content: flex-end;
  align-items: center;

  pointer-events: none;
  padding: var(--SPACING-SMALL);
}

.header-tabs>label>i {
  pointer-events: all;
}

.header-tabs a {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--SPACING-SMALL);

  color: red;
  transition: 0.5s;
  font-size: var(--FS-SMALL);
}

.header-tabs a:is(:hover, :focus) {
  text-decoration: underline;
  background-color: paleturquoise;
  color: blue;
}

.header-tabs a:active {
  color: darkblue;
  -webkit-filter: brightness(1.3);
          filter: brightness(1.3);
}

main {
  margin-top: 20vh;
  width: 100%;
  min-height: 75vh;
}

#top {
  display: flex;
  justify-content: flex-end;
  align-items: center;

  width: 100%;
  padding: var(--SPACING-SMALL);
  pointer-events: none;

  position: fixed;
  bottom: 10vh;
  left: 0;
  z-index: 999;
}

#top a {
  display: flex;
  justify-content: center;
  align-items: center;

  width: 2em;
  height: 2em;

  border-radius: 50%;
  pointer-events: all;
  background-color: silver;
  color: black;
  opacity: .4;
  transition: all .5s;
}

#top a:is(:focus, :hover) {
  background-color: pink;
  color: purple;
  opacity: 1;
}

#top a:active {
  -webkit-filter: brightness(1.3);
          filter: brightness(1.3);
}

footer {
  display: flex;
  justify-content: center;
  align-items: center;

  width: 100%;
  height: 5vh;

  position: fixed;
  bottom: 0;
  left: 0;
  z-index: 1500;

  font-size: var(--FS-SMALLEST);
  padding: var(--SPACING-SMALL);
  background-color: var(--BG-FIXED--COLOR);
  box-shadow: 0 -.25em .25em var(--FIXED__BOX-SHADOW);
}


/* ========== RESPONSIVE DESIGN ========== */

@media only screen and (min-width: 576px) {

  .header-logo a h1 {
    font-size: var(--FS-LARGE);
  }

  header>label {
    top: var(--SPACING-SMALL);
    left: var(--SPACING-SMALL);
  }


  footer {
    font-size: var(--FS);
  }

}

@media only screen and (min-width: 992px) {
  header {
    flex-direction: row;
  }

  .header-logo {
    width: 50%;
  }

  .header-logo a {
    flex-direction: row;
  }

  header>label {
    display: none;
  }

  .header-tabs {
    flex-direction: row;
    justify-content: flex-end;

    position: relative;
    height: 100%;
    width: 50%;

    visibility: visible;
    opacity: 1;
    overflow: hidden;
    max-width: 100%;
    transform: translateX(0);
    -moz-column-gap: var(--SPACING-SMALL);
          column-gap: var(--SPACING-SMALL);
    padding: var(--SPACING-SMALL);
    background: transparent;
  }

  .header-tabs>label>i {
    display: none;
  }

  .header-tabs a {
    padding: 0;
  }

  .header-tabs a:is(:hover, :focus) {
    background-color: transparent;
    -webkit-filter: brightness(1);
            filter: brightness(1);
    color: darkblue;
    transform: scale(1.1);
  }

  .header-tabs a:active {
    -webkit-filter: brightness(1.3);
            filter: brightness(1.3);
  }

}