/* 3rd party font */
@import url("https://fonts.googleapis.com/css2?family=Figtree:ital,wght@0,300..900;1,300..900&display=swap");

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

/* Variable and Fallbacks */
:root {
  --primary-text: rgba(235, 235, 240, 0.9);
  --accent-color: orange;
}

/* Element Selector */
body {
  background-color: #0e0f10;

  color: var(--primary-text, #ffffff);
  font-family: "Figtree", sans-serif;
  line-height: 1.6;

  /* Margin and padding shorthand */
  margin: 0 auto;
  padding: 25px;

  /* Relative unit */
  min-height: 100vh;
}

header {
  /* Block display */
  display: block;

  width: 80vw;
  max-width: 800px;
  min-width: 300px;

  /* Text alginment */
  text-align: center;
  background-color: rgb(20, 20, 25); /* rgb color */

  /* Margin and padding longhand */
  margin-top: 10px;
  margin-bottom: 5mm;
  margin-left: auto;
  margin-right: auto;

  padding-top: 15px;
  padding-bottom: 15px;
  padding-left: 20px;
  padding-right: 20px;

  border-style: solid;
  border-color: #333;
  border-width: 1px;
  border-radius: 8px;
}

/* Adjacent Selector */
h1 + h2 {
  text-decoration: underline;
}

h1 {
  color: #4087b9;
  font-size: 24pt;
}

h2 {
  color: #bf9f26;
}

h3 {
  color: hsl(74, 32%, 76%);
}

h2 ~ div {
  padding: 1em;
}

a {
  /* Wider Gamut Color */
  color: color(colorspace 0.706 0.392 0.455);
  text-decoration: none;
  font-weight: bold;
}

/* Pseudo class selector */
a:hover {
  color: lightcoral;
  text-decoration: underline;
}

a:active {
  color: #ffcc00;
}

/* Selector list */
main,
footer {
  max-width: 800px;
  margin: 0 auto;
  padding: 10px 20px;
}

nav {
  position: sticky;
  top: 0;
  z-index: 100;

  background-color: color-mix(in srgb, #0e0f10 85%, #fefae0 15%);

  border: 2px solid #faedcd;
  padding: 15px;
  border-radius: 12px;
}

/* Descendant Combinator */
nav ul {
  /* Flexbox layout */
  display: flex;
  flex-direction: row;
  justify-content: space-around;
  align-items: center;

  list-style: none;
  padding: 0;
}

nav li {
  display: inline-block;
}

/* Id selector */
#attendance {
  background-color: rgba(255, 255, 255, 0.05);
  border-radius: 8px;
}

/* Child combinator */
section > h2 {
  margin-bottom: 0.5rem;
}

/* Class selector */
.highlight {
  color: var(--accent-color);
}

p.highlight {
  font-weight: bold;

  display: inline;
}

/* Attribute selector */
input[type="text"] {
  border: 1px solid #ccc;
  padding: 5px;
  border-radius: 4px;
}

/* :has() selector */
section:has(form) {
  border: 2px dashed #bf9f26;
  padding: 20px;
  border-radius: 8px;
}

/* Grid layout */
form fieldset {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 1.5rem;
  align-items: center;

  border-color: #4087b9;
}

/* Nested selector */
footer {
  position: relative;
  height: 50px;
  text-align: center;
  p {
    color: #888;
    font-size: 0.9em;
  }
}

/* Media Query */
@media (max-width: 600px) {
  form fieldset {
    grid-template-columns: 100%;
  }

  nav ul {
    flex-direction: column;
    gap: 10px;
  }
}