/* =========================================================
   SAWGraph Shared Stylesheet
   ========================================================= */


/* ---------- Color Variables ---------- */

:root {
  --saw-blue: #0066cc;
  --saw-blue-dark: #004499;
  --saw-heading-blue: #1a4d7a;
  --saw-subheading-blue: #2a5c91;

  --saw-pale-blue: #f0f4ff;
  --saw-light-grey: #f8f9fa;
  --saw-border-grey: #e5e5e5;

  --saw-text: #333333;
  --saw-muted-text: #555555;

  --saw-shadow:
    0 2px 6px rgba(0, 0, 0, 0.08);

  --saw-shadow-hover:
    0 4px 12px rgba(0, 102, 204, 0.15);
}


/* ---------- General Page Layout ---------- */

html {
  scroll-padding-top: 75px;
}

body {
  color: var(--saw-text);
}

.site-main {
  max-width: 1564px;
  margin: 0 auto;
  padding: 80px 16px 0;
}

p {
  line-height: 1.7;
}

ul,
ol {
  line-height: 1.8;
}

li {
  margin-bottom: 10px;
}


/* ---------- Links ---------- */

/*
   Main-content links only.
   This prevents these rules from changing the appearance
   of navigation links created by menu.js.
*/

.site-main a {
  color: var(--saw-blue);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

.site-main a:hover {
  color: var(--saw-blue-dark);
  text-decoration: underline;
}


/* ---------- Page and Section Headings ---------- */

/* Primary title on interior pages */
.page-title {
  color: #1a1a1a;
  font-size: 2.5em;
  font-weight: 700;
  margin: 0 0 30px;
  padding-bottom: 15px;
  border-bottom: 3px solid var(--saw-blue);
}

/* Major page sections */
.section-title {
  color: var(--saw-blue);
  font-size: 1.8em;
  font-weight: 600;
  margin-top: 40px;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--saw-blue);
}

/* Subsections within a major section */
.subsection-title {
  color: var(--saw-subheading-blue);
  font-size: 1.35em;
  font-weight: 600;
  margin-top: 28px;
  margin-bottom: 14px;
}


/* ---------- Introductory / Highlighted Sections ---------- */

.intro-section {
  background: var(--saw-pale-blue);
  padding: 25px;
  border-radius: 8px;
  margin-bottom: 40px;
  border-left: 5px solid var(--saw-blue);
}

.intro-section p:first-child {
  margin-top: 0;
}

.intro-section p:last-child {
  margin-bottom: 0;
}


/* General callout using the same visual vocabulary */
.callout-section {
  background: var(--saw-pale-blue);
  padding: 25px;
  border-radius: 8px;
  margin: 30px 0;
  border-left: 5px solid var(--saw-blue);
}


/* ---------- Home Page Header ---------- */

.home-header {
  padding-bottom: 20px;
  overflow: auto;
}

.header-logo {
  float: left;
  margin: 10px 35px 20px 0;
  max-width: 380px;
  height: auto;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: var(--saw-shadow);
  transition:
    transform 0.3s ease,
    box-shadow 0.3s ease;
}

.header-logo:hover {
  transform: translateY(-4px);
  box-shadow: var(--saw-shadow-hover);
}

.home-intro-text {
  overflow: hidden;
}

.project-title {
  color: var(--saw-heading-blue);
  font-size: 1.6em;
  font-weight: 700;
  line-height: 1.35;
  margin-top: 0;
  margin-bottom: 12px;
}

.tagline {
  color: var(--saw-subheading-blue);
  font-size: 1.2em;
  font-weight: 600;
  line-height: 1.5;
}


/* ---------- Comparison Graphic ---------- */

.comparison-box {
  background: var(--saw-pale-blue);
  border-left: 5px solid var(--saw-blue);
  border-radius: 8px;
  padding: 20px;
  margin: 30px 0 40px;
  box-shadow: var(--saw-shadow);
}

.comparison-box img {
  display: block;
  width: 100%;
  max-width: 1000px;
  height: auto;
  margin: 0 auto;
}

.comparison-box p {
  margin-bottom: 0;
}


/* ---------- Core Use Case Cards ---------- */

.use-case-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  margin: 25px 0 40px;
}

.use-case-card {
  background: var(--saw-light-grey);
  border-left: 5px solid var(--saw-blue);
  border-radius: 6px;
  padding: 22px;
  box-shadow: var(--saw-shadow);
  transition:
    background-color 0.3s ease,
    box-shadow 0.3s ease,
    transform 0.3s ease;
}

.use-case-card:hover {
  background: var(--saw-pale-blue);
  box-shadow: var(--saw-shadow-hover);
  transform: translateY(-3px);
}

.use-case-card h3 {
  color: var(--saw-blue);
  font-size: 1.25em;
  font-weight: 600;
  margin-top: 0;
  margin-bottom: 14px;
}

.use-case-question {
  color: var(--saw-text);
  font-weight: 600;
  line-height: 1.5;
}


/* ---------- Multi-column Information Lists ---------- */

.info-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 35px;
  margin: 20px 0 35px;
}

.info-item {
  margin: 0;
}

.info-item strong {
  color: var(--saw-heading-blue);
}


/* ---------- Action Buttons ---------- */

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 22px;
}

.site-main a.site-button {
  display: inline-block;
  padding: 12px 20px;
  background: var(--saw-blue);
  color: white;
  font-weight: 600;
  text-decoration: none;
  border-radius: 5px;
  transition:
    background-color 0.2s ease,
    transform 0.2s ease;
}

.site-main a.site-button:hover {
  background: var(--saw-blue-dark);
  color: white;
  text-decoration: none;
  transform: translateY(-2px);
}

/* Secondary section-link buttons */

.site-main a.site-button-secondary {
  display: inline-block;
  padding: 10px 18px;
  border: 2px solid var(--saw-blue);
  color: var(--saw-blue);
  background: white;
  font-weight: 600;
  text-decoration: none;
  border-radius: 5px;
  transition:
    background-color 0.2s ease,
    color 0.2s ease,
    transform 0.2s ease;
}

.site-main a.site-button-secondary:hover {
  background: var(--saw-pale-blue);
  color: var(--saw-blue-dark);
  text-decoration: none;
  transform: translateY(-2px);
}


/* ---------- Responsive Video ---------- */

.video-container {
  width: 100%;
  max-width: 800px;
  margin: 25px auto 40px;
}

.video-container iframe {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  height: auto;
  border: 0;
}


/* ---------- Publications ---------- */

/*
   Use class="publication-list" on the Publications page.
   Do not style every <ol> as publication cards because
   ordered lists are used normally elsewhere on the site.
*/

.publication-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.publication-list li {
  margin-bottom: 25px;
  padding: 20px;
  background: var(--saw-light-grey);
  border-left: 5px solid var(--saw-blue);
  border-radius: 6px;
  box-shadow:
    0 2px 4px rgba(0, 0, 0, 0.05);
  transition:
    background-color 0.3s ease,
    box-shadow 0.3s ease,
    transform 0.3s ease;
}

.publication-list li:hover {
  background: var(--saw-pale-blue);
  box-shadow: var(--saw-shadow-hover);
  transform: translateX(5px);
}

.site-main .publication-list li a {
  color: var(--saw-blue);
  font-weight: 600;
  font-size: 1.05em;
}

.publication-list li i {
  display: block;
  margin-top: 10px;
  color: var(--saw-muted-text);
  font-size: 0.95em;
}


/* ---------- Site Footer ---------- */

.site-footer {
  background: var(--saw-heading-blue);
  color: white;
  text-align: center;
  padding: 32px 20px;
  margin-top: 48px;
}

.site-footer p {
  margin: 0;
  font-size: 1.2em;
  font-weight: 500;
  letter-spacing: 0.2px;
}


/* ---------- Back to Top Button ---------- */

#backToTop {
  display: none;
  position: fixed;
  bottom: 40px;
  right: 40px;
  z-index: 99;

  border: none;
  outline: none;

  background-color: var(--saw-heading-blue);
  color: white;

  cursor: pointer;

  width: 52px;
  height: 52px;
  padding: 0;

  border-radius: 50%;
  font-size: 20px;

  box-shadow:
    0 4px 12px rgba(0, 0, 0, 0.2);

  transition:
    background-color 0.3s ease,
    transform 0.3s ease;
}

#backToTop:hover {
  background-color: var(--saw-blue);
  transform: scale(1.08);
}


/* ---------- Responsive Styles ---------- */

@media (max-width: 850px) {

  .header-logo {
    float: none;
    display: block;
    max-width: 90%;
    margin: 0 auto 30px;
  }

  .home-intro-text {
    overflow: visible;
  }

  .use-case-grid {
    grid-template-columns: 1fr;
  }

  .info-grid {
    grid-template-columns: 1fr;
  }

}


@media (max-width: 600px) {

  .site-main {
    padding-top: 75px;
  }

  .page-title {
    font-size: 1.8em;
    margin-bottom: 20px;
  }

  .section-title {
    font-size: 1.5em;
  }

  .project-title {
    font-size: 1.35em;
  }

  .tagline {
    font-size: 1.1em;
  }

  .intro-section,
  .callout-section,
  .comparison-box {
    padding: 18px;
  }

  .use-case-card {
    padding: 18px;
  }

  .publication-list li {
    padding: 15px;
    margin-bottom: 15px;
  }

  .publication-list li a {
    font-size: 1em;
  }

  .button-row {
    flex-direction: column;
  }

  .site-main a.site-button {
    text-align: center;
  }

  #backToTop {
    bottom: 25px;
    right: 25px;
  }

}