:root {
  --bg: #1e1e1e;
  --text: #e9e9e9;
  --accent: #e3b505;
  --grid: #333333;
  --cell-size: 100px;
  /* calculated by JS */
  --grid-width: 100%;
  /* calculated by JS */
  --bg-y: 0px;
  /* calculated by JS for parallax */
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: 'Playfair Display', serif;
  margin: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  /* Stop page-level scrolling */
}

/* Keep Tailwind classes from conflicting with default fonts */
.font-sans,
.font-serif,
.font-mono {
  font-family: inherit;
}

.font-mono-accent {
  font-family: 'Space Mono', monospace;
}

.text-accent {
  color: var(--accent);
}

.border-grid {
  border-color: var(--grid);
}

/* The outer container provides padding around the grid */
.outer-container {
  flex: 1;
  display: flex;
  justify-content: center;
  padding: 2vh 4vw;
  /* Margin around the grid: noticeable on L/R, smaller on T/B */
  overflow: hidden;
  box-sizing: border-box;
}

/* The viewport where content lives */
.grid-viewport {
  position: relative;
  width: var(--grid-width);
  height: 100%;
  border-right: 1px solid var(--grid);
  border-bottom: 1px solid var(--grid);
  border-top: 0;
  border-left: 0;
  overflow-y: auto;
  /* Internal scrolling */
  overflow-x: hidden;

  /* Grid background */
  background-image:
    linear-gradient(to right, var(--grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid) 1px, transparent 1px);
  background-size: var(--cell-size) var(--cell-size);
  background-position: 0 var(--bg-y);

  /* Hide scrollbar for a cleaner blueprint layout */
  scrollbar-width: none;
  /* Firefox */
  -ms-overflow-style: none;
  /* IE and Edge */
}

.grid-viewport::-webkit-scrollbar {
  display: none;
  /* Chrome, Safari, Opera */
}

/* Content wrapper to allow proper internal scrolling on top of background */
.content-wrapper {
  position: relative;
  z-index: 10;
  min-height: 100%;
  display: flex;
  flex-direction: column;
}

/* Navigation pinned inside the grid */
nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(30, 30, 30, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--grid);
  border-top: 1px solid var(--grid);
  border-left: 1px solid var(--grid);
}

.nav-link {
  transition: color 0.2s, opacity 0.2s;
}

.nav-link:hover {
  color: var(--accent);
}

.nav-link:hover svg {
  opacity: 1;
  stroke: var(--accent);
}

/* Section padding relative to cell size for alignment aesthetics */
.hero-pad {
  padding-top: calc(var(--cell-size) * 1.5);
  padding-bottom: calc(var(--cell-size) * 1.5);
}

/* Project layout alignment based on grid modes */
.project-row {
  display: flex;
  flex-direction: column;
  width: 100%;
  margin-bottom: calc(var(--cell-size) * 1.5);
}

.project-row.image-left {
  align-items: flex-start;
}

.project-row.image-right {
  align-items: flex-end;
}

.project-text {
  padding: 0 1.5rem;
  /* mobile padding so text doesn't touch outer edges */
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.project-gap {
  display: none;
}

.project-image {
  background-color: #232323;
  /* slightly lighter than bg */
  border-left: 1px solid var(--grid);
  border-top: 1px solid var(--grid);
  border-bottom: 1px solid var(--grid);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
  flex-shrink: 0;
  /* 4-col base sizes */
  width: calc(var(--cell-size) * 2);
  height: calc(var(--cell-size) * 2);
  margin-bottom: calc(var(--cell-size) * 0.5);
  /* Mobile only spacing between stacked img/text */
}

.project-row.image-right .project-image {
  width: calc(var(--cell-size) * 2 - 1px);
}

@media (min-width: 640px) {

  /* 8-col */
  .project-row {
    flex-direction: row;
  }

  .project-row.image-right {
    flex-direction: row-reverse;
  }

  .project-row.image-left,
  .project-row.image-right {
    align-items: center;
    /* Vertically center in rows */
  }

  .project-text {
    padding: 0;
    /* Flush to inner edge on desktop */
  }

  .project-image {
    width: calc(var(--cell-size) * 3);
    height: calc(var(--cell-size) * 2);
    margin-bottom: 0;
  }

  .project-row.image-right .project-image {
    width: calc(var(--cell-size) * 3 - 1px);
  }

  .project-gap {
    display: block;
    width: calc(var(--cell-size) * 1);
    flex-shrink: 0;
  }
}

@media (min-width: 1024px) {

  /* 12-col */
  .project-image {
    width: calc(var(--cell-size) * 4);
    height: calc(var(--cell-size) * 3);
  }

  .project-row.image-right .project-image {
    width: calc(var(--cell-size) * 4 - 1px);
  }
}

@media (min-width: 1280px) {

  /* 16-col */
  .project-image {
    width: calc(var(--cell-size) * 6);
    height: calc(var(--cell-size) * 4);
  }

  .project-row.image-right .project-image {
    width: calc(var(--cell-size) * 6 - 1px);
  }
}

.project-image::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(45deg, transparent 40%, rgba(227, 181, 5, 0.05) 50%, transparent 60%);
  transform: translateX(-100%);
  transition: transform 0.6s ease;
}

.project-image:hover::before {
  transform: translateX(100%);
}

/* Teaching Demo Grid */
.demo-grid {
  display: grid;
  --demo-gap: calc(var(--cell-size) * 0.5);
  gap: var(--demo-gap);
  padding-left: calc(var(--demo-gap) / 2);
  padding-right: calc(var(--demo-gap) / 2);
}

/* Teaching Demo Cards */
.demo-card {
  display: flex;
  flex-direction: column;
  text-decoration: none;
}

.demo-image {
  background-color: #232323;
  border: 1px solid var(--grid);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
  aspect-ratio: 4 / 3;
  width: 100%;
  margin-bottom: 1rem;
}

.demo-image::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(45deg, transparent 40%, rgba(227, 181, 5, 0.05) 50%, transparent 60%);
  transform: translateX(-100%);
  transition: transform 0.6s ease;
}

.demo-card:hover .demo-image::before {
  transform: translateX(100%);
}

.demo-title {
  font-family: 'Space Mono', monospace;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  color: #a0a0a0;
  transition: color 0.2s;
}

.demo-card:hover .demo-title {
  color: var(--accent);
}

.demo-image-label {
  font-family: 'Space Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: #666;
  transition: color 0.2s;
}

.demo-card:hover .demo-image-label {
  color: var(--accent);
}