/* ============================================================
   EPFL 2026 — "Two Gifts from Robert" — Polymer Talk
   Dark chalkboard palette inspired by NotebookLM video:
     blue  #ADD8E6  (Brownian motion / clean math)
     pink  #FFB6C1  (polymer / tilted measure)
     lime  #CCFF33  (highlights / section titles)
     chalk #E8E8E8  (body text on dark bg)
   ============================================================ */

/* ---------- layout helpers ---------- */
.flex-container {
  display: flex;
  justify-content: space-evenly;
  align-items: center;
  text-align: center;
}

.flex-container img {
  max-width: 500px;
  height: auto;
  border-radius: 10%;
  margin: 0 20px;
}

/* ---------- coauthor / photo cards ---------- */
.coauthor-container {
  display: inline-block;
  text-align: center;
  margin: 0 20px;
}
.coauthor-container img {
  width: 220px;
  height: auto;
  border-radius: 15%;
}
.coauthor-container p {
  margin-top: 8px;
  font-size: 26px;
}

/* ---------- video ---------- */
.SimulationVideo {
  width: 680px;
  max-width: 90vw;
  border-radius: 6px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.5);
}

/* Image-backdrop slides (colored-noise motivation slides).
   Text anchored top-right with a subtle dark scrim for contrast. */
.reveal .slides section.image-backdrop {
  padding: 0 !important;
  /* Do NOT override `position` — Reveal uses position:absolute for
     sections in a vertical stack; forcing `relative` makes them flow
     in document order and pushes later sibling slides off-screen. */
}
.backdrop-caption {
  position: absolute;
  top: 6%;
  right: 5%;
  max-width: 46%;
  text-align: right;
  padding: 0;
  background: none;            /* no scrim — text floats over the image */
  border-radius: 0;
  /* Heavy multi-layer text shadow = readable over any background
     without an opaque box behind it. */
  text-shadow:
    0 0 3px rgba(0, 0, 0, 0.95),
    0 0 6px rgba(0, 0, 0, 0.85),
    0 0 12px rgba(0, 0, 0, 0.7),
    0 2px 4px rgba(0, 0, 0, 0.9);
  -webkit-text-stroke: 0.4px rgba(0, 0, 0, 0.6);  /* subtle outline */
}

/* Full-slide video with controls — used for the 4 Manim animations so the
   presenter can pause/scrub/jump to a specific moment.  Paired with
   a 16:9 Reveal canvas (1280×720) so the video fills the viewport. */
.reveal .slides section.fullscreen-slide {
  padding: 0 !important;
}
/* Reminiscence overlay on the guitar slide — three short lines
   revealed on keypress, upper-right area, whisper size. */
.guitar-reminiscence {
  position: absolute;
  top: 10%;
  right: 5%;
  max-width: 46%;
  text-align: right;
  z-index: 9;
  font-size: 24px;
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.92);
  text-shadow:
    0 0 4px rgba(0,0,0,0.95),
    0 0 10px rgba(0,0,0,0.8),
    0 2px 4px rgba(0,0,0,0.9);
  pointer-events: none;
}

/* Credit line overlaid on fullscreen videos (bottom-left, subtle). */
.video-credit {
  position: absolute;
  bottom: 36px;
  left: 36px;
  font-size: 18px;
  color: rgba(255, 255, 255, 0.85);
  font-style: italic;
  z-index: 10;
  text-shadow: 0 0 4px rgba(0,0,0,0.9), 0 0 10px rgba(0,0,0,0.7);
  pointer-events: auto;  /* allow the link to be clickable */
}
.video-credit a:hover { text-decoration: underline !important; }

.FullscreenVideo {
  /* Size matches Reveal's 1280x720 slide canvas. */
  width: 1280px;
  height: 720px;
  object-fit: contain;
  background: #000;
  display: block;
  margin: 0;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-gap: 20px;
  justify-items: center;
  align-items: center;
}
.video-grid video {
  width: 100%;
  max-height: 200px;
}

/* ---------- split-screen for BM vs polymer ---------- */
.split-screen {
  display: flex;
  justify-content: space-around;
  align-items: flex-start;
  gap: 30px;
}
.split-panel {
  flex: 1;
  text-align: center;
  padding: 10px;
}
.split-panel.bm {
  border-right: 2px solid rgba(255,255,255,0.15);
}

/* ---------- theorem / definition boxes ---------- */
.theorem {
  background: rgba(51, 0, 34, 0.7);
  border-left: 4px solid #FFB6C1;
  padding: 18px 24px;
  margin: 16px 0;
  text-align: left;
  border-radius: 4px;
}
.definition {
  background: rgba(0, 34, 51, 0.7);
  border-left: 4px solid #ADD8E6;
  padding: 18px 24px;
  margin: 16px 0;
  border-radius: 4px;
}
.highlight-box {
  background: rgba(40, 50, 10, 0.7);
  border-left: 4px solid #CCFF33;
  padding: 18px 24px;
  margin: 16px 0;
  border-radius: 4px;
}

/* ---------- dramatic reveal ---------- */
.reveal-dramatic {
  font-size: 1.6em;
  color: #FFB6C1;
  text-shadow: 0 0 20px rgba(255, 182, 193, 0.5);
}
.singular-symbol {
  font-size: 1.5em;
  color: #FF4444;
  text-shadow: 0 0 30px rgba(255, 68, 68, 0.6);
}
.equivalent-symbol {
  font-size: 1.5em;
  color: #44FF88;
  text-shadow: 0 0 30px rgba(68, 255, 136, 0.6);
}

/* ---------- timeline ---------- */
.timeline {
  position: relative;
  padding: 10px 0;
  list-style: none;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 3px;
  background: rgba(255,255,255,0.2);
  transform: translateX(-50%);
}
.timeline li {
  position: relative;
  margin: 12px 0;
  padding: 8px 20px;
  font-size: 0.85em;
}
.timeline li::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  width: 12px;
  height: 12px;
  background: #CCFF33;
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

/* ---------- spectral hierarchy table ---------- */
table {
  width: 100%;
  border-collapse: collapse;
}
th, td {
  text-align: center;
  padding: 10px 8px;
  font-size: 0.85em;
}
th {
  border-bottom: 2px solid rgba(255,255,255,0.3);
  color: #CCFF33;
}
tr:nth-child(even) {
  background-color: rgba(255,255,255,0.04);
}

/* ---------- typography ---------- */
section h3 {
  color: #CCFF33;
}
section h4 {
  margin-bottom: 30px;
  color: #E8E8E8;
}

.left-text {
  text-align: left;
}

.source {
  font-size: 0.6em;
  font-style: italic;
  text-align: center;
  margin-top: 10px;
  color: #888;
}

/* ---------- image defaults ---------- */
img {
  max-height: 500px;
  width: auto;
  object-fit: contain;
  border-radius: 8%;
}

/* photo gallery row */
.photo-row {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}
.photo-row img {
  height: 520px;
  width: auto;
  max-width: 48%;
  object-fit: contain;
  border-radius: 8%;
  box-shadow: 0 6px 24px rgba(0,0,0,0.5);
}

/* ---------- bibtex references ---------- */
.bibtexnumber {
  font-size: 15pt;
  text-align: right;
}
.bibtexitem {
  font-size: 15pt;
  text-align: right;
}

/* ---------- block layout (video + text side by side) ---------- */
.block {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.block video {
  flex: 1;
  flex-basis: 60%;
  max-width: 60%;
}

/* ---------- dedication styling ---------- */
.dedication {
  font-style: italic;
  color: #ADD8E6;
  font-size: 0.9em;
  margin-top: 20px;
}

/* ---------- open problem / mystery ---------- */
.mystery {
  background: rgba(60, 0, 0, 0.5);
  border: 1px dashed rgba(255,100,100,0.4);
  padding: 20px;
  border-radius: 8px;
  margin: 16px 0;
}