/* ---- Home page ---- */

.d-puzzle-title {
  padding-top: 3rem;
  padding-bottom: 1rem;

  display: grid;
  justify-items: center;
  row-gap: 2em;

  img {
    width: 100%;
    min-width: 100px;
    max-width: 300px;
  }
}

.d-puzzle-slogan {
  margin-top: 2rem;
  margin-bottom: 3rem;
  display: grid;
  justify-items: center;
  
  img {
    height: 30px;
  }
}

.external-link {
  font-size: 0.7rem;
  vertical-align: top;
}

/* ---- Main flow and layout ---- */

.chapter {
  padding-top:0;
  padding-bottom: 2rem;
  
  display: grid;
  justify-items: center;
}

.top-separator {
  width: 100%;
  border-top-width: 1px;
  border-top-style: solid;
  border-top-color: var(--clr-secondary);
}

.bottom-separator {
  width: 100%;
  border-bottom-width: 1px;
  border-bottom-style: solid;
  border-bottom-color: var(--clr-secondary);
}

.suppress-top-margin {
  margin-top: 0;
}

.footnote {
  font-weight: lighter;
  font-size: 1.0rem;
  line-height: 1.4rem;
  text-align: start;
  text-indent: 0.8rem hanging;
  scroll-margin-top: calc(100vh - 70px);
}

.footnotes {
  position: relative;
  padding: 1rem 0 0 0;
  margin: 1.0 0;
}


.footnotes::before {  /* horizontal line before , 25% width */
  content: '';
  position: absolute;
  top: 15px;
  left: 0px;
  width: 25%;
  height: 1px;
  background-color: var(--clr-secondary);
}


/* Emphasis and spacing */

.maniculed-hint {
  display: flex;
  justify-content: center;
  align-items: center;
  column-gap: 1rem;

  text-align: center;
  font-weight: normal;
  /* color: var(--clr-secondary); */

  img {
    height: 1.5rem;
  }
}

.subtitle,
.take-away {
  p {
    margin-top: 0;
  }
  font-size: 1.2rem;
  padding: 0.8rem 1.6rem;
  margin: 1.5rem 0;
  justify-self: center;
  font-weight: normal;
  text-align: center;
}

.subtitle {
  color: var(--clr-primary);
  background-color: var(--clr-dark-lighter);
  break-inside: avoid;
}

.take-away {
  width: 100%;
  max-width: 800px;
  color: var(--clr-primary);
  background-color: var(--clr-secondary);
  break-inside: avoid;
}

.standout {
  color: var(--clr-accent);
  font-weight: bold;
}

.framed {
  border-style: solid;
  border-width: 1px;
  padding: 1rem 0.5rem 1.4rem;
  margin-top: 1rem;
  margin-bottom: 0.5rem;
}

p {
  margin-top: 0.5rem;
  text-align: center;
}

.p-left-aligned {
  text-align: start;
}

.p-big {
  margin-top: 1rem;
  margin-bottom: 1rem;
  font-size: 1.4rem;
  line-height: 2rem;
  text-align: center;
}

.air {
  margin-top: 0.75rem;
}

.more-air {
  margin-top: 1.5rem;
}

.airbourne {
  margin-top: 3rem;
}

/* Responsive Design: Text */

/* Narrower lines = Better readability: */
.single-column-text, 
.two-column-text-container {
  max-width: 840px;
  margin-inline: auto;
}

.two-column-text-container {
  margin-top: 1.5rem;
  margin-bottom: 1.5rem;
}

.two-column-text,
.multi-column-text {
  max-width: 600px;
  margin-top: 1rem;
  margin-bottom: 1rem;
  margin-inline: auto;

  /* Optional: prevent column breaks in awkward places */
  h2, h3 {
    break-after: avoid-column;
    break-inside: avoid;
  }
}
  
.two-column-text > p,
.multi-column-text > p {
  text-align: justify;
}

.two-column-text > .span-columns {
  column-span: all;
}


.multi-column-text > p:not(.subtitle, .take-away),
.multi-column-text > ul > li,
.multi-column-text a {
  font-family: serif;
  font-weight: lighter;
  font-size: 1.3rem;
}

.multi-column-text .footnote {
  font-family: serif;
  font-size: 1.1rem;
}

@media (min-width: 872px) {
  
  .two-column-text, .multi-column-text {
    max-width: unset;
    column-width: 400px;  /* Minimum width per column */
    column-gap: 2rem;
  }

  .two-column-text {
    column-count: 2;
  }

  .multi-column-text {
    column-rule: 0px solid var(--clr-secondary); /* vertical divider */
  }
}


/* Images */

.img-light-background {
  img {
    background-color: var(--clr-light);
    padding: 5px;
  }
}

.img-secondary-background {
  img {
    background-color: var(--clr-secondary);
  }
}

.single-figure-full-width {
  min-width: 250px;
  margin-top: 2rem;
  margin-bottom: 2rem;
  margin-inline: auto;
}


/* Collapsible content */

.collapsible-container {
  display: grid;
  justify-items: center;
}

.collapsible-button {
  margin-top: 1rem;
  padding: 18px;
  width: 300px;
  cursor: pointer;
  border: none;
  outline: none;
  font-size: 1.2rem;
  text-align: center;
  color: var(--clr-light);
  background-color: var(--clr-accent-darker);
}

.collapsible-content {
  display: grid;
  justify-items: center;
  margin-inline: auto;
  padding: 0 18px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.2s ease-out;
}

.collapsible-button-active, .collapsible-button:hover {
  background-color: var(--clr-accent);
}

.collapsible-button:after {
  float: right;
  content: '\002B';
  margin-left: 5px;
  font-weight: bold;
  color: var(--clr-light);
}

.collapsible-button-active:after {
  content: "\2212";
}

/* YouTube Video */
/*** There is some hocus-pocus going on with zero-bottom-padding.
 *** max-width is set on top of width.
 *** May want to try the 'aspect-ratio' property instead.
 ***/
.video-container {
  position: relative;
  margin-top: 30px;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  height: 0;
  width: 100%;
  max-width: 840px; /* same as single-column-text */
  overflow: hidden;
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

/* Social-Media Profiles */
.linkedin-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #0A66C2;
  border: 2px solid #0A66C2;
  background: var(--clr-light);
  padding: 10px 22px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s ease;
}

.linkedin-outline:hover {
  background: #0A66C2;
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(10, 102, 194, 0.2);
}

.linkedin-outline:hover svg {
  fill: white;
}