:root {
  --bg: #f7f5f1;
  --paper: #fffcf7;
  --ink: #1c1916;
  --muted: #5c564e;
  --line: #ddd6cb;
  --accent: #8b2e2e;
  --accent-2: #2c4a6e;
  --shadow: 0 10px 40px rgba(40, 28, 18, 0.08);
  --max: 1080px;
  font-synthesis: none;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Source Serif 4", "Iowan Old Style", Georgia, serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
}
body.poster .hide-poster { display: none !important; }
a { color: var(--accent-2); }
header.hero, main, footer { max-width: var(--max); margin: 0 auto; padding: 0 1.25rem; }
header.hero { padding-top: 3.2rem; padding-bottom: 2rem; }
.venue {
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.78rem;
  font-family: "Source Sans 3", system-ui, sans-serif;
  color: var(--accent);
  font-weight: 650;
}
h1 {
  font-weight: 650;
  font-size: clamp(1.55rem, 3.2vw, 2.25rem);
  line-height: 1.25;
  margin: 0.4rem 0 0.8rem;
}
.authors { font-size: 1.02rem; }
.authors span { white-space: nowrap; }
.affil { color: var(--muted); font-size: 0.92rem; margin-top: 0.35rem; }
.btns {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.25rem;
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--bg);
  padding: 0.55rem 0;
}
.btn {
  font-family: "Source Sans 3", system-ui, sans-serif;
  text-decoration: none;
  color: var(--ink);
  background: var(--paper);
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  font-size: 0.88rem;
  border: 1px solid var(--ink);
  cursor: pointer;
}
.btn:hover,
.btn:focus-visible {
  background: var(--ink);
  color: var(--paper);
  outline: none;
}
.btn:active {
  background: #3a342e;
  color: var(--paper);
}
.btn.ghost { background: transparent; color: var(--ink); }
section { padding: 1.4rem 0 1.6rem; border-top: 1px solid var(--line); }
h2 {
  font-size: 1.35rem;
  margin: 0 0 0.8rem;
}
.abstract { font-size: 1.02rem; }
video {
  width: 100%;
  border-radius: 12px;
  background: #111;
  box-shadow: var(--shadow);
}
.viewer-wrap {
  background: #111;
  border-radius: 12px;
  overflow: hidden;
  position: relative;
  box-shadow: var(--shadow);
  width: 100%;
  height: min(70vh, 620px);
}
.viewer-wrap canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}
.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
  margin: 0.7rem 0;
  font-family: "Source Sans 3", system-ui, sans-serif;
  font-size: 0.88rem;
}
select, .toolbar button {
  font: inherit;
  padding: 0.35rem 0.55rem;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--paper);
}
.toolbar button.active { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.hint { color: #efe7dc; font-size: 0.78rem; position: absolute; left: 12px; bottom: 12px; font-family: "Source Sans 3", system-ui, sans-serif; pointer-events: none; }
.split {
  position: absolute;
  top: 0; bottom: 0;
  width: 4px;
  background: #fff;
  cursor: ew-resize;
  z-index: 5;
  transform: translateX(-50%);
  touch-action: none;
}
.split[hidden], .badge-l[hidden], .badge-r[hidden] { display: none !important; }
.split::after {
  content: "";
  position: absolute;
  inset: 0 -14px;
}
.badge-l, .badge-r {
  position: absolute;
  top: 12px;
  z-index: 2;
  font-family: "Source Sans 3", system-ui, sans-serif;
  font-size: 0.75rem;
  background: rgba(0,0,0,.55);
  color: #fff;
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
}
.badge-l { left: 12px; }
.badge-r { right: 12px; }
.loading {
  position: absolute; inset: 0; display: grid; place-items: center;
  color: #ddd; font-family: "Source Sans 3", system-ui, sans-serif;
  background: rgba(10,10,10,.45);
  z-index: 4;
}
.loading.hidden { display: none; }

/* ---- Video preview section ---- */
.video-panel[hidden] { display: none !important; }
.video-hint { font-size: 0.82rem; color: var(--muted); margin: 0.45rem 0 0; }

/* Launch card */
.video-launch {
  display: flex;
  align-items: center;
  gap: 1rem;
  width: 100%;
  max-width: 640px;
  text-align: left;
  font-family: "Source Sans 3", system-ui, sans-serif;
  padding: 1.25rem 1.4rem;
  border-radius: 14px;
  border: 2px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  cursor: pointer;
  transition: background .15s, color .15s;
}
.video-launch:hover,
.video-launch:focus-visible {
  background: #3a342e;
  border-color: #3a342e;
  outline: none;
}
.video-launch.is-open {
  background: var(--paper);
  color: var(--ink);
}
.video-panel { margin-top: 0.8rem; }
.video-launch-icon {
  font-size: 2.2rem;
  line-height: 1;
  flex-shrink: 0;
  opacity: .95;
}
.video-launch-text {
  display: flex;
  flex-direction: column;
  gap: .2rem;
}
.video-launch-title {
  font-size: 1.05rem;
  font-weight: 650;
}
.video-launch-sub {
  font-size: 0.81rem;
  opacity: 0.78;
}

/* In-page video */
.video-wrap {
  position: relative;
  width: 100%;
  max-width: 640px;
  margin: 0.5rem 0 0;
  background: #111;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--line);
  aspect-ratio: 16 / 9;
  display: grid;
  place-items: center;
}
.video-wrap video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #111;
  pointer-events: auto;
  touch-action: manipulation;
}
.video-controls {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  width: 100%;
  max-width: 640px;
  box-sizing: border-box;
  padding: 0.6rem 0.7rem;
  background: #25211e;
  color: #fff;
  border-radius: 0 0 10px 10px;
  font-family: "Source Sans 3", system-ui, sans-serif;
}
.video-controls button {
  flex: 0 0 auto;
  min-width: 76px;
  border: 1px solid rgba(255,255,255,.35);
  border-radius: 6px;
  background: transparent;
  color: #fff;
  padding: 0.35rem 0.5rem;
  cursor: pointer;
}
.video-controls input[type="range"] {
  flex: 1 1 auto;
  min-width: 80px;
  cursor: pointer;
  touch-action: none;
}
.video-controls input[type="range"]:disabled {
  cursor: wait;
  opacity: .45;
}
.video-controls output {
  flex: 0 0 auto;
  min-width: 86px;
  font-size: 0.76rem;
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.video-wrap:has(> .video-placeholder) {}
.video-placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: #aaa;
  font-family: "Source Sans 3", system-ui, sans-serif;
  font-size: 0.85rem;
  text-align: center;
  padding: 2rem;
  border: 2px dashed #555;
  border-radius: 10px;
  box-sizing: border-box;
}

/* ---- Floating mini-player ---- */
.video-float {
  display: none;        /* JS sets display:flex when visible */
  flex-direction: column;
  position: fixed;
  z-index: 200;
  right: 14px;
  bottom: 14px;
  width: clamp(180px, 30vw, 300px);
  background: #111;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,.25);
  box-shadow: 0 8px 32px rgba(0,0,0,.55);
  overflow: visible;
  touch-action: auto;
  user-select: none;
  /* Animate in */
  transition: opacity .2s, transform .2s;
  transform-origin: bottom right;
}
.video-float.is-visible {
  display: flex;
}
.video-float.is-dragging {
  transition: none;
  box-shadow: 0 12px 42px rgba(0,0,0,.68);
}
.video-float-bar {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.3rem 0.4rem 0.3rem 0.5rem;
  background: rgba(0,0,0,.8);
  color: #fff;
  font-family: "Source Sans 3", system-ui, sans-serif;
  font-size: 0.72rem;
  cursor: grab;
  flex-shrink: 0;
  min-height: 32px;
  touch-action: none;
  border-radius: 10px 10px 0 0;
}
.video-float-bar:active { cursor: grabbing; }
.video-float-drag-hint {
  opacity: .55;
  font-size: 1rem;
  flex-shrink: 0;
}
.video-float-bar span:not(.video-float-drag-hint) {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.video-float-bar button {
  border: 0;
  background: transparent;
  color: #fff;
  font-size: 0.95rem;
  line-height: 1;
  padding: 0.15rem 0.35rem;
  cursor: pointer;
  border-radius: 4px;
  flex-shrink: 0;
}
.video-float-bar button:hover { background: rgba(255,255,255,.15); }
.video-float-body {
  flex: 1;
  background: #000;
  position: relative;
  overflow: hidden;
  border-radius: 0 0 10px 10px;
}
.video-float-body video {
  display: block;
  width: 100%;
  height: auto;
  max-height: 45vh;
  pointer-events: auto;
  touch-action: manipulation;
}
.video-float-resize {
  position: absolute;
  right: 8px;
  bottom: 8px;
  width: 22px;
  height: 22px;
  padding: 0;
  z-index: 3;
  cursor: nwse-resize;
  touch-action: none;
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 7px;
  background: rgba(255,255,255,.08);
  box-shadow: 0 4px 14px rgba(0,0,0,.25);
  opacity: 0.9;
}
.video-float-resize:hover,
.video-float.is-dragging .video-float-resize {
  opacity: 1;
  background: rgba(255,255,255,.12);
}
.video-float-resize::before {
  content: "";
  position: absolute;
  right: 6px;
  bottom: 6px;
  width: 9px;
  height: 9px;
  border-right: 2px solid rgba(255,255,255,.65);
  border-bottom: 2px solid rgba(255,255,255,.65);
}

@media (max-width: 700px) {
  .video-float {
    width: clamp(180px, 62vw, 260px);
    right: max(8px, env(safe-area-inset-right));
    bottom: max(8px, env(safe-area-inset-bottom));
  }
  .video-launch { padding: 1rem 1.1rem; gap: .75rem; }
  .video-launch-icon { font-size: 1.8rem; }
  .video-launch-sub { line-height: 1.35; }
  .video-float-bar { min-height: 38px; }
  .video-float-resize {
    right: 10px;
    bottom: 10px;
    width: 26px;
    height: 26px;
  }
  .video-controls { gap: 0.45rem; padding: 0.55rem; }
  .video-controls button { min-width: 66px; }
  .video-controls output { min-width: 72px; font-size: 0.7rem; }
}
figure { margin: 1rem 0; }
figure img { width: 100%; border-radius: 8px; background: #fff; }
figcaption { font-size: 0.88rem; color: var(--muted); margin-top: 0.35rem; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  font-family: "Source Sans 3", system-ui, sans-serif;
  background: var(--paper);
}
th, td { border: 1px solid var(--line); padding: 0.4rem 0.45rem; text-align: center; }
th { background: #efe8de; }
.cite-list { padding-left: 1.2rem; font-size: 0.92rem; }
.cite-list li { margin: 0.35rem 0; }
.cite-list a { color: var(--accent, #1a5f7a); text-decoration: underline; text-underline-offset: 2px; }
.cite-list a:hover { color: var(--ink, #1a1a1a); }
pre {
  background: #1c1916;
  color: #f2ebe3;
  padding: 0.9rem 1rem;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 0.78rem;
}
.copy {
  font-family: "Source Sans 3", system-ui, sans-serif;
  margin-top: 0.4rem;
}
footer { padding: 2rem 1.25rem 3rem; color: var(--muted); font-size: 0.88rem; }
.qr { width: 140px; background: #fff; padding: 8px; border-radius: 8px; }
@media (max-width: 700px) {
  .viewer-wrap { height: 62vh; }
  .btns .btn { font-size: 0.82rem; }
}