/* Section: QClassroom — Minimal, clean layout inspired by abdussalam.pk */

.s-classroom {
  /* Starts black; turns white when section is in view; reverts to black on exit. */
  background-color: #000;
  color: #fff;
  transition: background-color 1.6s ease, color 1.6s ease;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 13px;
  font-weight: 400;
  line-height: 18px;
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
}
.s-classroom.bg-light {
  background-color: #fff;
  color: #000;
}
.s-classroom a { text-decoration: none; color: currentColor; border-bottom: 1px solid transparent; }
.s-classroom a:hover { border-bottom-color: currentColor; }
.s-classroom img { max-width: 100%; height: auto; }

/* p5 canvas */
.s-classroom .classroom-canvas-wrap {
  position: absolute; top: 0; left: 0; z-index: 1;
  width: 100%; height: 100%; pointer-events: none;
}
@media (max-width: 1024px) { .s-classroom .classroom-canvas-wrap { display: none; } }
.s-classroom .classroom-write {
  position: absolute; font-weight: 200; font-size: 64pt; line-height: 1.1;
  width: 70%; top: 2.7em; left: 15%; z-index: 2;
  mix-blend-mode: exclusion; pointer-events: none;
}
@media (max-width: 1024px) { .s-classroom .classroom-write { display: none; } }

/* Layout: sidebar + content */
.s-classroom .classroom-layout {
  position: relative;
  z-index: 10;
  display: flex;
  min-height: 100vh;
  max-width: 100%;
  margin: 0;
  padding: 0 40px;
}

/* Sidebar — hidden */
.s-classroom .classroom-sidebar {
  display: none;
}
.s-classroom .classroom-sidebar ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.s-classroom .classroom-sidebar li {
  margin: 0;
  padding: 2px 0;
}
.s-classroom .classroom-sidebar > ul > li > a {
  font-size: 13px;
  letter-spacing: 0.3px;
  line-height: 24px;
  color: #000;
  border: none;
  display: block;
}
.s-classroom .classroom-sidebar > ul > li > a:hover { color: #888; border: none; }

/* Sub-menu for featured projects */
.s-classroom .classroom-sidebar .sub-menu {
  list-style: none;
  padding: 0 0 0 12px;
  margin: 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.s-classroom .classroom-sidebar .sub-menu.open {
  max-height: 200px;
}
.s-classroom .classroom-sidebar .sub-menu li a {
  font-size: 11px;
  color: #999;
  letter-spacing: 0.2px;
  line-height: 20px;
  border: none;
}
.s-classroom .classroom-sidebar .sub-menu li a:hover { color: #000; border: none; }
.s-classroom .classroom-sidebar .sub-menu li a.active { color: #000; }

/* Toggle arrow */
.s-classroom .sidebar-toggle {
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
}
.s-classroom .sidebar-toggle::after {
  content: '+';
  font-size: 11px;
  color: #ccc;
  transition: transform 0.3s ease;
}
.s-classroom .sidebar-toggle.open::after {
  content: '\2013';
}

/* Content area — flush, GT-style padding */
.s-classroom .classroom-content {
  flex: 1;
  padding: 0;
  margin-left: 0;
  max-width: 100%;
}

/* About — GT-style body, single column inside the 4-col layout */
.s-classroom #classroom-about {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 13px;
  line-height: 18px;
  color: #000;
  -webkit-font-smoothing: antialiased;
}
.s-classroom .classroom-about-text {
  margin: 0 0 17px 0;
  max-width: none;
  font-size: 13px;
  line-height: 18px;
}
.s-classroom .classroom-about-text + .classroom-about-text { margin-top: 0; }

/* 4-col layout: about (col 1) + 3 featured projects (cols 2–4), GT-style */
.s-classroom .classroom-top {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  column-gap: 40px;
  row-gap: 24px;
  align-items: start;
  padding: 80px 0 30px 0;
  margin: 0;
  box-sizing: border-box;
}
.s-classroom .classroom-top > #classroom-about { grid-column: 1; grid-row: 2; }
@media (max-width: 900px) {
  .s-classroom .classroom-top { grid-template-columns: 1fr; padding: 30px; }
  .s-classroom .classroom-top > #classroom-about { grid-column: auto; grid-row: auto; }
}

/* Project category */
.s-classroom .project-category {
  margin: 60px 0 0 0;
  padding: 0;
}
.s-classroom .project-category-title {
  color: currentColor;
  font-size: 13px;
  line-height: 18px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 0 0 12px 0;
  border-bottom: 1px solid rgba(128,128,128,0.2);
  margin-bottom: 30px;
}

/* Featured Projects — title row 1, masonry block in cols 2–4 */
.s-classroom #classroom-cmu { display: contents; }
.s-classroom #classroom-cmu .project-category-title {
  grid-column: 1 / -1;
  grid-row: 1;
  margin: 0;
}
.s-classroom #classroom-cmu .featured-masonry {
  grid-column: 2 / -1;
  grid-row: 2;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  column-gap: 24px;
  align-items: start;
}
.s-classroom #classroom-cmu .featured-project { margin: 0; }
/* Per-project images: masonry-packed */
.s-classroom #classroom-cmu .project-images {
  display: block;
  column-count: 2;
  column-gap: 4px;
}
.s-classroom #classroom-cmu .project-images > * {
  break-inside: avoid;
  margin: 0 0 4px 0;
  display: block;
}
@media (max-width: 900px) {
  .s-classroom #classroom-cmu { display: block; }
  .s-classroom #classroom-cmu .project-category-title { grid-column: auto; grid-row: auto; }
  .s-classroom #classroom-cmu .featured-masonry { grid-column: auto; grid-row: auto; column-count: 1; }
}

/* Featured project */
.s-classroom .featured-project {
  margin: 0 0 60px 0;
  padding: 0;
}
.s-classroom #classroom-cmu .project-desc { max-width: none; }
.s-classroom #classroom-cmu .project-images { grid-template-columns: 1fr 1fr; }
.s-classroom .project-title {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: -0.2px;
  line-height: 18px;
  padding: 0 0 4px 0;
}
.s-classroom .more-link {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.3px;
  opacity: 0.4;
  border: none !important;
  margin-left: 8px;
}
.s-classroom .more-link:hover { opacity: 1; border: none !important; }
.s-classroom .project-meta {
  font-size: 13px;
  line-height: 18px;
  color: #888;
  letter-spacing: 0.3px;
  margin: 0 0 12px 0;
}
.s-classroom .project-desc {
  font-size: 13px;
  line-height: 18px;
  color: #888;
  max-width: 560px;
  margin: 0 0 16px 0;
}
.s-classroom .project-students {
  font-size: 13px;
  line-height: 18px;
  color: #aaa;
  letter-spacing: 0.2px;
  margin: 12px 0 0 0;
}

/* Project images — wide 2-col grid */
.s-classroom .project-images {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  margin: 16px 0 8px 0;
  max-width: 100%;
}
.s-classroom .project-images img {
  width: 100%;
  max-width: 800px;
  height: auto;
  display: block;
}

/* Image with label overlay — always visible, press to bounce */
.s-classroom .img-labeled {
  position: relative;
  overflow: hidden;
  cursor: pointer;
}
.s-classroom .img-label {
  position: absolute;
  top: 13px;
  left: 50%;
  transform: translateX(-50%) translateY(0px);
  background: #fff;
  color: #78df71;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.3px;
  padding: 5px 14px;
  border-radius: 20px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  z-index: 2;
  box-shadow: 0px 1px 3px rgba(120, 223, 113, 0.18);
  opacity: 0;
  transition: opacity 0.25s ease, transform 0.25s ease, background 0.25s ease;
  white-space: nowrap;
}
.s-classroom .img-labeled:hover .img-label {
  opacity: 1;
}
.s-classroom .img-labeled.pressed .img-label {
  opacity: 1;
  transform: translateX(-50%) translateY(3px);
  background: rgba(255, 255, 255, 0.5);
  transition: transform 0s, background 0s, opacity 0s;
}

/* Archive — 4-col layout matching Featured Projects: text col 1, images cols 2–4 */
.s-classroom #classroom-archive {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  column-gap: 40px;
  row-gap: 24px;
  align-items: start;
}
.s-classroom #classroom-archive .project-category-title { grid-column: 1 / -1; margin-bottom: 0; }
.s-classroom #classroom-archive .archive-intro { grid-column: 1; grid-row: 2; margin: 0; }
.s-classroom #classroom-archive .project-archive-grid {
  grid-column: 2 / -1;
  grid-row: 2;
  column-count: 3;
  column-gap: 8px;
  margin: 0;
  display: block;
}
.s-classroom #classroom-archive .project-archive-grid img {
  width: 100%;
  height: auto;
  display: block;
  margin: 0 0 8px 0;
  break-inside: avoid;
  opacity: 1;
}
@media (max-width: 900px) {
  .s-classroom #classroom-archive { grid-template-columns: 1fr; }
  .s-classroom #classroom-archive .archive-intro,
  .s-classroom #classroom-archive .project-archive-grid { grid-column: auto; grid-row: auto; }
  .s-classroom #classroom-archive .project-archive-grid { grid-template-columns: repeat(2, 1fr); }
}

/* Lectures — very small, like misc awards */
.s-classroom .lectures-list {
  font-size: 13px;
  line-height: 18px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}
.s-classroom .lectures-list .yr-odd { color: #ccc; }
.s-classroom .lectures-list .yr-even { color: #888; }

/* Background: white 8s → 3s fade to black → black 8s → 3s fade to white */
@keyframes classroom-bg {
  0%    { background-color: #fff; }
  13.6% { background-color: #000; }
  50%   { background-color: #000; }
  63.6% { background-color: #fff; }
  100%  { background-color: #fff; }
}
/* Text color animation: only for initially-black text */
/* Delayed 1.8s after bg, 3s transition */
@keyframes classroom-text {
  0%    { color: #000; }
  8.2%  { color: #000; }
  21.8% { color: #fff; }
  58.2% { color: #fff; }
  71.8% { color: #000; }
  100%  { color: #000; }
}
.s-classroom .classroom-about-text,
.s-classroom .project-category-title,
.s-classroom .project-title {
  animation: classroom-text 22s ease infinite;
}

/* Responsive */
@media (max-width: 1024px) {
  .s-classroom .classroom-layout {
    flex-direction: column;
    padding: 0 20px;
  }
  .s-classroom .classroom-sidebar {
    width: 100%; min-width: 100%;
    position: relative; top: 0;
    padding: 30px 0 0 0;
  }
  .s-classroom .classroom-content {
    padding: 30px 0 60px 0;
    max-width: 100%;
  }
  .s-classroom .project-images { grid-template-columns: 1fr; }
  .s-classroom .project-archive-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 640px) {
  .s-classroom .project-archive-grid { grid-template-columns: repeat(2, 1fr); }
}