/*-------------------- Base Style --------------------*/
html {
  color: #222;
  font-size: 1em;
  line-height: 1.4;
}

/*-------------------- Global Color and Font Variables --------------------*/
html[data-theme="light"] { color-scheme: light; }
html[data-theme="dark"] { color-scheme: dark; }
:root {
  color-scheme: light dark;

  --color-bg: #efe5d6;
  --color-surface: #f6eee2;
  --color-text: #273328;
  --color-muted: #6d725f;
  --color-border: #cfc1ac;
  --color-hover: #eee5d8;
  --color-hover-2: #d6c2a8;

  --color-primary: #1f5a3f;
  --color-primary-2: #133b2a;
  --color-primary-gradient: linear-gradient(90deg, #25694b 0%, #1f5a3f 100%);

  --color-shadow: 0 10px 30px rgba(31, 45, 36, 0.15);

  --font-body: "Roboto", sans-serif;
  --font-heading: "Space Grotesk", sans-serif;
}
html[data-theme="dark"] {
  --color-bg: #08150f;
  --color-surface: #133b2a;
  --color-text: #e6f0ea;
  --color-muted: #a0b2a7;
  --color-border: #2e4b3d;
  --color-hover: #204433;
  --color-hover-2: #1f5a3f;
  --color-primary: #2f7a57;
  --color-primary-2: #1f5a3f;
  --color-primary-gradient: linear-gradient(90deg, #2f7a57 0%, #1f5a3f 100%);
  --color-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
}

/*-------------------- Helper Classes --------------------*/
.sr-only {
  border: 0;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px;
  white-space: nowrap;
}
.spacer {
  min-height: 7.5rem;
}

/*-------------------- Main Grid --------------------*/
main {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-template-rows: auto auto 1fr auto;
  gap: 1rem;
  min-height: 100vh;
}

/*-------------------- Body Style --------------------*/
body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  margin: 0;
}

/*-------------------- Header Styles --------------------*/
.primary-header {
  background: var(--color-primary-gradient);
  color: light-dark(var(--color-bg), white);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--color-shadow);

  grid-column: 1/13;
  grid-row: 1/2;
  display: grid;
  grid-template-columns: subgrid;
  grid-template-rows: subgrid;
}
.header-container {
  grid-column: 1 / 8;
  grid-row: 1;
  margin-left: 0.5rem;
}
.primary-header h1,
.primary-header h2 {
  margin: 0.01rem;
}
.primary-header h1 {
  font-weight: 600;
  font-size: 1.25rem;
}
.primary-header .subtitle {
  font-weight: 400;
  font-size: 0.8rem;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
}

/*-------------------- Navigation Styles --------------------*/
nav {
  padding: 1rem;
}

/* Header Nav Styles */
.header-links-container {
  grid-column: 9/-1;
  grid-row: 1;
  justify-self: end;
  padding-left: 1rem;
}
.header-links-container ul {
  list-style: none;
  margin: 0;
  padding-top: 0.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.header-links-container a {
  position: relative;
  width: 1.25rem;
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
}
.header-links-container a:after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.25rem;
  width: 0%;
  height: 0.125rem;
  transition: width 0.3s ease;
  background: light-dark(var(--color-bg), black);
}
.header-links-container a:hover::after {
  width: 100%;
}
#github-link {
  background-image: url("../img/github-light-icon.svg");
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
}
#linkin-link {
  background-image: url("../img/linkedin-light-icon.svg");
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
}
#course-page-link {
  background-image: url("../img/course-light-icon.svg");
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
}
html[data-theme="dark"] #github-link { background-image: url("../img/github-dark-icon.svg"); }
html[data-theme="dark"] #linkin-link { background-image: url("../img/linkedin-dark-icon.svg"); }
html[data-theme="dark"] #course-page-link { background-image: url("../img/course-dark-icon.svg"); }

/*--------------------- Assignment Card Styles --------------------*/
#assignment-links {
  grid-column: 1 / 13;
  grid-row: 2;
  padding: 1rem;
}
#assignment-links h2 {
  margin: 0 0 1rem 0;
}
.card-grid,
.card-grid-labs {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
.assignment-card {
  display: grid;
  gap: 0.6rem;
  padding: 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  box-shadow: var(--color-shadow);
  text-decoration: none;
  color: var(--color-text);
  transition:
    transform 160ms ease,
    box-shadow 160ms ease,
    border-color 160ms ease;
}
.assignment-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.18);
  border-color: var(--color-hover-2);
}
.assignment-card h3 {
  margin: 0;
  font-size: 1.25rem;
  letter-spacing: 0.2px;
  border-bottom: 1px solid var(--color-border);
}
.assignment-description {
  margin: 0;
  color: var(--color-text);
  font-weight: 400;
  padding: 1rem 0 1rem 0;
  border-bottom: 1px solid var(--color-border);
}
.status,
.date-submitted {
  margin: 0;
  font-size: 0.92rem;
  color: var(--color-muted);
}

/*-------------------- Lab Card Styles --------------------*/
#lab-links {
  grid-column: 1 / -1;
  grid-row: 3;
  padding: 1rem;
}
.lab-card {
  display: grid;
  gap: 0.75rem;
  padding: 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  box-shadow: var(--color-shadow);
  transition:
    transform 160ms ease,
    box-shadow 160ms ease;
}
.lab-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.18);
}
.lab-card h3 {
  margin: 0;
  font-size: 1.25rem;
  letter-spacing: 0.2px;
  border-bottom: 1px solid var(--color-border);
}
.lab-card ul {
  list-style: none;
  margin: 0.5rem 0;
  padding: 0;
  display: grid;
  gap: 0.35rem;
}
.lab-card li a {
  display: block;
  padding: 0.45rem 0.6rem;
  text-decoration: none;
  color: var(--color-text);
  border-radius: 6px;
  background: var(--color-hover);
  transition:
    background 120ms ease,
    transform 120ms ease;
}
.lab-card li a:hover {
  background: var(--color-hover-2);
  transform: translateX(3px);
}
.lab-description {
  margin: 0;
  color: var(--color-text);
  font-weight: 400;
  padding: 1rem 0 1rem 0;
  border-bottom: 1px solid var(--color-border);
}

/*-------------- Footer Styles --------------------*/
.primary-footer {
  background: var(--color-primary-gradient);
  color: light-dark(var(--color-bg), white);
  border-top: 1px solid var(--color-border);
  box-shadow: var(--color-shadow);

  grid-column: 1/13;
  grid-row: 4;
  display: flex;
}
#copyright {
  margin: 0.01rem;
  padding-left: 1rem;
  font-family: var(--font-heading);
  font-size: 0.9rem;
}
#top-link {
  margin: 0.01rem;
  padding-left: .25rem;
  font-family: var(--font-heading);
  text-decoration: none;
  color: inherit;
  font-size: 0.9rem;
}
#top-link:hover {
  text-decoration: underline;
}
#theme-toggle-label {
  margin: 0.01rem;
  margin-left: auto;
  font-family: var(--font-heading);
  font-size: 0.9rem;
}
#theme-toggle {
  margin-right: 1rem;
  margin-left: 0.25rem;
  background-color: transparent;
  border: none;
  width: 1rem;
  border-radius: 50%;
  background-image: url("../img/lightmode-icon.svg");
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
}
#theme-toggle:hover {
  background-color: light-dark(var(--color-primary-2), var(--color-primary));
}
html[data-theme="dark"] #theme-toggle { background-image: url("../img/darkmode-icon.svg"); }

/* -------------------- Responsive Styles --------------------*/
@media (max-width: 353px) {
  /* xsm */
  .header-container {
    grid-column: 1 / -1;
    justify-self: center;
    text-align: center;
  }
  .header-links-container {
    display: none;
  }
  .primary-header .subtitle {
    display: none;
  }
  #theme-toggle {
    display: none;
  }
  #theme-toggle-label {
    display: none;
  }
}

@media (min-width: 768px) {
  /* md */
  .primary-header h1 {
    font-size: 2rem;
  }
  .primary-header .subtitle {
    font-size: 1rem;
  }
  .header-links-container a {
    width: 2rem;
  }
  #copyright,
  #top-link {
    font-size: 1rem;
  }
  .card-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  /* lg */
  .primary-header h1 {
    font-size: 2.25rem;
  }
  .primary-header .subtitle {
    font-size: 1.25rem;
  }
}

@media (min-width: 1280px) {
  /* xl */
  .card-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
  .card-grid-labs {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1536px) {
  /* 2xl */
  .card-grid {
    grid-template-columns: 1fr 1fr 1fr 1fr;
  }
  .card-grid-labs {
    grid-template-columns: 1fr 1fr 1fr;
  }
}