@import url('https://fonts.googleapis.com/css2?family=Roboto+Slab:wght@400;700&display=swap');
/*this is the custom font linked above*/
/* Basic variables */
:root {
  --main-color: #0f4c5c;
  --bg: rgb(245, 245, 245);
}

/* Universal selector */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: 'Roboto Slab', serif;
  color: var(--text-color, #222); /* variable with fallback */
  background-image: linear-gradient(
    to bottom,
    color-mix(in srgb, #ffffff 70%, #c7e7ef 30%),
    #ebf0f5
  );
  text-align: center;
}

/* Element selectors */
h2 {
  color: rgb(255, 0, 0);
  text-decoration: underline;
}

h3 {
  color: hsl(192, 72%, 22%);
}

/* ID selector */
#current {
  color: orange; /* color name */
}

/* Class selectors */
.note {
  color: #b00020;
  font-weight: bold;
}

.name {
  color: hsla(192, 72%, 22%, 0.95);
}

/* Selector list */
ul, ol {
  list-style-position: inside;
  padding-left: 0;
}

/* Attribute selector */
a[href^="#"] {
  color: teal;
}

/* Pseudo classes */
a:hover {
  color: orange;
}

button:active {
  background-color: #ddd;
}

/* Display values */
video, audio {
  display: block;
  margin: 12px auto;
}

button {
  display: inline-block;
}

input[type="checkbox"], input[type="radio"] {
  display: inline;
}

datalist {
  display: none;
}

/* Sizing + absolute/relative units */
main {
  width: 90%;        /* relative % */
  max-width: 16cm;   /* absolute cm */
  min-width: 320px;  /* absolute px */
  margin: auto;      /* auto margin */

  /* Margin */
  margin-top: 12px;
  margin-right: auto;
  margin-bottom: 12px;
  margin-left: auto;

  /* Padding  */
  padding: 1rem 1.2rem 1rem 1.2rem; /* relative rem */

  /* Border */
  border-style: solid;
  border-color: #999;
  border-width: 2px;
  border-radius: 10px;

  position: relative;
  background-color: #fff;
}

header {
  background-color: rgba(15, 76, 92, 0.9);
  border-bottom: 4px solid #0b3a45;
  border-bottom-color: color(display-p3 0.05 0.23 0.29 / 1);
  color: white;

  /* Padding longhand */
  padding-top: 8px;
  padding-right: 8px;
  padding-bottom: 8px;
  padding-left: 8px;

  /* Margin shorthand */
  margin: 0 0 10px 0;
  position: sticky;
  top: 0;
}

img {
  width: 100%;
  max-width: 500px;
  min-width: 200px;
  height: auto;
  border: 3px dashed #8ab; /* border shorthand */
  border-radius: 6px;
}

/* Combinators */

nav a {
  background-color: #e5f7fb;
  padding: 2px 5px;
}

/* Child */
nav > ul {
  border: 2px dotted #0f4c5c;
}

/* General sibling */
h3 ~ ol {
  background-color: #fff4cc;
}

/* Adjacent sibling */
h3 + ul {
  border: 2px solid #f8b4b4;
}

/* Combining two selectors */
p.note {
  border: 2px solid #f44;
  padding: 0.6em; /* relative em */
}

/* New selector: :has() */
h3:has(+ ul) {
  border-left: 7px solid #333;
}

/* Fallback rules for browsers without nesting support */
main section#end {
  border: 2px dashed #333;
  margin-top: 10px;
}

main section#end summary {
  font-size: 12pt; /* absolute pt */
  text-decoration: underline;
}

/* Nested selectors */
main {
  & section#end {
    border: 2px dashed #333;
    margin-top: 10px;
  }

  & section#end summary {
    font-size: 12pt; /* absolute pt */
    text-decoration: underline;
  }
}

/* Flexbox (3+ children in nav ul) */
nav > ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
}

/* Grid (3+ children in form) */
footer form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  align-items: start;
  grid-auto-flow: row;
  justify-items: start;
}

/* Extra box model examples */
fieldset {
  /* Padding */
  padding: 10px 12px 10px 12px;

  /* Border  */
  border: 0.08in solid #bbb; /* absolute in */

  /* Margin */
  margin: 0 0 10px 0;
}

/* Media query for responsiveness */
@media (max-width: 700px) {
  footer form {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 1.4rem;
  }
}