:root{
  --brand-font: "Raleway", sans-serif;
  --topbar-height: 10vh;
  --gap: 2vw;
  --accent-red: #c62828;
}

*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family:var(--brand-font);font-weight:700;color:#111}
a{color:inherit;text-decoration:none}
button{font-family:var(--brand-font);font-weight:700}
.grid-root{display:grid;min-height:100vh;align-items:start;gap:var(--gap)}

/* Landing */
.landing-root{position:relative}
.landing-background{
  position:fixed;inset:0;background-size:cover;background-position:center;z-index:-1;
}
.landing-nav{position:fixed;top:20vh;left:5%;color:#f5f5f5}
.landing-nav ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:1rem}
.landing-nav li{font-size:clamp(1rem,2.5vw,1.5rem)}
.landing-nav li.brand-landing{letter-spacing:0.2em}
.landing-nav a{color:inherit}

/* Topbar for pages */
.topbar{position:fixed;top:0;left:0;right:0;height:var(--topbar-height);background:#fff;display:flex;align-items:center;z-index:10;border-bottom:1px solid #eee}
.topbar-inner{width:100%;display:flex;align-items:center;justify-content:space-between;padding:0 4vw}
.brand{font-weight:700;letter-spacing:0.15em}
.topnav ul{list-style:none;display:flex;gap:2rem;margin:0;padding:0;align-items:center}
.topnav a{display:inline-block}
.hamburger{display:none;background:transparent;border:none;font-size:1.8rem}

/* Mobile dropdown */
.mobile-dropdown{position:absolute;top:100%;left:0;right:0;background:#fff;border-top:1px solid #ddd;box-shadow:0 6px 14px rgba(0,0,0,.06);z-index:20}
.mobile-dropdown ul{list-style:none;margin:0;padding:1rem}
.mobile-dropdown li{padding:0.75rem 0}
.mobile-dropdown a{display:block;font-size:1.2rem}

/* Two-column content */
.page-content{padding-top:calc(var(--topbar-height) + 2vh);padding-left:4vw;padding-right:4vw;position:relative;z-index:1}
.col-left{grid-column:1}
.col-right{grid-column:3}

.about-grid, .contact-grid {
  grid-template-columns: 1fr 2px 1fr;
  align-items:start;
  gap:2rem;
}
.about-left, .contact-left{
  padding-left:4vw;
}
.about-right img, .contact-right img{
  width:100%;
  height:auto;
  max-width:350px;
  object-fit:contain;
}
.divider-vertical{
  width:2px;background:#000;height:60vh;justify-self:center;align-self:start;grid-column:2;
}

/* Projects grid */
.projects-grid{grid-template-columns: 1fr 2px 1fr; padding-top:calc(var(--topbar-height) + 2vh)}
.projects-list{padding-left:4vw;grid-column:1;overflow-y:auto;max-height:calc(100vh - var(--topbar-height) - 4vh)}
.project-item{display:block;width:100%;text-align:left;padding:0.5rem 0;border:none;background:none;cursor:pointer}
.project-item:focus{outline:3px solid #000}

.projects-preview{overflow-y:auto;max-height:calc(100vh - var(--topbar-height) - 4vh);grid-column:3}
.projects-preview .preview-inner{padding:1rem}
.preview-grid{display:grid;grid-template-columns:1fr 1fr 1fr;grid-template-rows:auto auto auto;gap:0.5rem;max-width:450px}
.preview-grid .thumb-wrap{width:100%;aspect-ratio:1/1;overflow:hidden;display:flex}
.preview-grid .thumb-wrap img{width:100%;height:100%;object-fit:cover;display:block}
.preview-grid .thumb-wrap:nth-child(1){grid-column:1;grid-row:1}
.preview-grid .thumb-wrap:nth-child(2){grid-column:2;grid-row:1}
.preview-grid .thumb-wrap:nth-child(3){grid-column:1;grid-row:2}
.preview-grid .thumb-wrap:nth-child(4){grid-column:2 / 4;grid-row:2;aspect-ratio:2/1;height:auto}
.preview-desc{grid-column:1 / -1;grid-row:3;padding:0.5rem 0;line-height:1.4}

/* Viewer */
.viewer-grid {
  grid-template-columns: 1fr 2px 1fr;
  align-items: start;
  gap: 2rem;
}

.viewer-left {
  padding-left: 4vw;
  overflow-y: auto;
  max-height: calc(100vh - var(--topbar-height) - 4vh);
}

.viewer-left h1 {
  margin-top: 0;
}

.project-blurbs, .project-description {
  margin-bottom: 1rem;
}

.inline-images {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
}

.inline-image {
  width: 100%;
  height: auto;
  max-width: 100%;
  max-height: 400px;
  object-fit: contain;
  cursor: pointer;
  transition: opacity 0.2s;
}

.inline-image:hover {
  opacity: 0.8;
}

.viewer-right {
  position: sticky;
  top: calc(var(--topbar-height) + 2vh);
}

.viewer-grid .divider-vertical {
  position: sticky;
  top: var(--topbar-height);
  height: 60vh;
}

.project-media {
  width: 100%;
  min-height: 75vh;
}

.project-media img, .project-media video {
  width: 100%;
  height: auto;
  max-height: 70vh;
  object-fit: contain;
}

.cad-viewer-wrap canvas {
  display: block;
}

/* Image Lightbox */
.image-lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  cursor: pointer;
}

.image-lightbox[hidden] {
  display: none;
}

.lightbox-close {
  position: absolute;
  top: 20px;
  left: 20px;
  background: rgba(255, 255, 255, 0.9);
  border: none;
  font-size: 2rem;
  width: 50px;
  height: 50px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  z-index: 1001;
}

.lightbox-close:hover {
  background: #fff;
}

#lightbox-image {
  max-width: 95vw;
  max-height: 95vh;
  object-fit: contain;
  cursor: default;
}

/* CAD Viewer Controls */
.cad-controls {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 10;
  display: flex;
  gap: 5px;
}

.cad-btn {
  background: rgba(255, 255, 255, 0.9);
  border: 2px solid #000;
  font-family: var(--brand-font);
  font-weight: 700;
  font-size: 1rem;
  width: 40px;
  height: 40px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.cad-btn:hover {
  background: #fff;
}

.cad-btn.walk-btn {
  width: auto;
  padding: 0 15px;
}

.cad-viewer-wrap.fullscreen {
  position: fixed;
  inset: 0;
  z-index: 9999;
  width: 100vw !important;
  height: 100vh !important;
  background: #000;
}

.walk-exit-msg {
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--brand-font);
  font-weight: 700;
  font-size: 1.2rem;
  color: #fff;
  background: rgba(0, 0, 0, 0.7);
  padding: 10px 20px;
  z-index: 10000;
}

/* PDF Viewer Controls */
.pdf-viewer-wrap {
  width: 100%;
  display: flex;
  flex-direction: column;
  height: 75vh;
}

.pdf-controls {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 10;
  display: flex;
  gap: 5px;
}

.pdf-btn {
  background: rgba(255, 255, 255, 0.9);
  border: 2px solid #000;
  font-family: var(--brand-font);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 8px 15px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pdf-btn:hover {
  background: #fff;
}

.pdf-btn.close-btn {
  width: 40px;
  height: 40px;
  padding: 0;
  font-size: 1.2rem;
}

.pdf-iframe {
  width: 100%;
  border: 1px solid #ddd;
  flex: 1;
  min-height: 0;
}

.pdf-viewer-wrap.expanded {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: #fff;
  z-index: 9999;
  padding: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.pdf-viewer-wrap.expanded .pdf-iframe {
  max-width: 90vw;
}

.pdf-download-link {
  display: block;
  margin-top: 10px;
  padding: 10px 0;
  text-decoration: underline;
  flex-shrink: 0;
}

/* Missing asset styling */
.missing-asset{
  border:2px solid var(--accent-red);color:var(--accent-red);padding:1em;text-align:center;
}

/* Responsive */
@media (max-width:800px){
  .topnav{display:none}
  .hamburger{display:block;cursor:pointer}
  .about-grid, .contact-grid, .projects-grid, .viewer-grid{
    grid-template-columns:1fr;
  }
  .col-left, .col-right, .divider-vertical{
    grid-column:1;
  }
  .divider-vertical{height:2px;width:100%;background:#000;margin:1rem 0}
  .landing-nav{top:20vh;left:15%}
  .landing-nav li{font-size:1.2rem}
  .projects-list{order:2;padding:1rem 4vw}
  .projects-preview{order:1;padding:1rem 4vw}
  .about-right img, .contact-right img{
    max-width:100%;
  }
  .viewer-right{
    position: relative;
    top: auto;
  }
}

/* focus outline visible */
:focus{outline:3px solid #333;outline-offset:2px}