/* =============================================================================
   Lip Forcing — Project Page Stylesheet
   Hand-written. MORPHOS-inspired but distinct (slim sidebar, asymmetric accents,
   custom stat strip, no rounded-edge overload).
   ============================================================================= */

/* ---------- Theme ---------- */
:root{
  /* Brand */
  --accent:        #6E45E2;       /* primary violet */
  --accent-strong: #5733C9;       /* darker violet */
  --accent-soft:   #EEE7FB;       /* tinted background for highlights */
  --accent-cyan:   #22B8CF;       /* secondary cyan (sync axis) */
  --accent-warm:   #F59E0B;       /* tertiary amber (used sparingly) */

  /* Neutrals */
  --bg:        #FBFAFE;           /* page background (faint violet white) */
  --surface:   #FFFFFF;           /* cards / inset blocks */
  --surface-2: #F5F2FB;           /* second-level inset */
  --text:      #1A1A24;
  --text-soft: #5A5A6C;
  --text-mute: #8A8A99;
  --border:    #E7E3F2;
  --border-soft: #F0EEF7;

  /* Typography */
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Source Serif 4', 'Source Serif Pro', Georgia, serif;
  --font-display: 'Manrope', 'Inter', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Layout */
  --sidebar-w: 230px;
  --content-max: 1180px;
  --content-px: clamp(20px, 3.5vw, 48px);
  --radius: 10px;
  --radius-lg: 16px;

  /* Shadows */
  --shadow-1: 0 4px 18px rgba(40, 30, 70, 0.07);
  --shadow-2: 0 12px 40px rgba(70, 50, 130, 0.10);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
a{ color: var(--accent); text-decoration:none; }
a:hover{ text-decoration:underline; }
code{ font-family:var(--font-mono); font-size:0.92em; background:var(--surface-2); padding:0.05em 0.4em; border-radius:4px; }
.hl{ color: var(--accent); font-weight:600; }

/* ---------- Reading progress bar ---------- */
#progress-bar{
  position:fixed;top:0;left:0;height:3px;width:0;
  background:linear-gradient(90deg, var(--accent), var(--accent-cyan));
  z-index:9999;
  transition:width 0.08s linear;
}

/* ---------- Layout ---------- */
/* Sidebar is pinned to the viewport's left edge. The .content flex item
   gets the rest of the row, then internally centers its constrained
   max-width inside that remaining space. */
.layout{
  display:flex;
  align-items:flex-start;
  min-height:100vh;
}

/* ---------- Sidebar ---------- */
.sidebar{
  position:sticky; top:0;
  flex:0 0 var(--sidebar-w); width:var(--sidebar-w);
  height:100vh; padding:32px 18px 28px 28px;
  display:flex; flex-direction:column;
  border-right:1px solid var(--border);
  background: linear-gradient(180deg, rgba(238,231,251,0.4), rgba(251,250,254,0.2) 40%);
}
.sidebar-brand{
  display:flex; align-items:center; gap:10px;
  margin-bottom:36px;
}
.brand-mark{
  display:inline-flex; align-items:center; justify-content:center;
  width:34px; height:34px; border-radius:9px;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color:white; font-weight:800; font-size:0.9rem; letter-spacing:0.02em;
  box-shadow: var(--shadow-1);
}
.brand-name{ font-weight:700; font-size:1.0rem; letter-spacing:-0.01em; }

.sidebar-nav{ display:flex; flex-direction:column; gap:2px; flex:1; }
.nav-link{
  display:block; padding:7px 12px;
  font-size:0.875rem; font-weight:500;
  color:var(--text-soft);
  border-left:2px solid transparent;
  transition: color 0.18s, border-color 0.18s, background-color 0.18s;
  border-radius: 0 4px 4px 0;
}
.nav-link:hover{ color:var(--accent); text-decoration:none; background:var(--surface-2); }
.nav-link.active{
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--accent-soft);
  font-weight:600;
}

.sidebar-foot{ margin-top:auto; padding-top:18px; border-top:1px solid var(--border-soft); }
.venue-badge{
  display:inline-block; padding:5px 10px;
  font-size:0.72rem; font-weight:600; letter-spacing:0.04em;
  text-transform:uppercase;
  background:var(--surface);
  color:var(--accent-strong);
  border:1px solid var(--border);
  border-radius:6px;
}

/* ---------- Content column ---------- */
.content{
  flex:1; min-width:0;
  max-width: calc(var(--content-max) + 2 * var(--content-px));
  padding: 64px var(--content-px) 96px;
  margin: 0 auto;   /* center the constrained content within the remaining row */
}

.sec{ margin-bottom:84px; scroll-margin-top:24px; }
.sec-label{
  display:inline-block;
  font-size:0.74rem; font-weight:700; letter-spacing:0.16em;
  text-transform:uppercase;
  color:var(--accent);
  padding:4px 0;
  border-bottom:2px solid var(--accent);
  margin-bottom:14px;
}
.sec-heading{
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.1vw, 2.15rem);
  font-weight:700;
  line-height:1.18;
  margin: 0 0 12px;
  letter-spacing:-0.028em;
}
.sub-heading{
  font-size: 1.2rem; font-weight:600;
  margin: 50px 0 14px;
  padding-left: 12px;
  border-left:3px solid var(--accent);
}
.sec-lead{
  font-size: 1.02rem; color:var(--text-soft);
  margin-top:0; margin-bottom:28px; max-width:72ch;
}
.cap{
  font-size: 0.85rem; color:var(--text-mute);
  margin-top:14px;
}

/* =============== HERO =============== */
.hero{
  padding-top: 24px;
}

/* Centered title / authors / links block */
.hero-head{
  text-align: center;
  max-width: 820px;
  margin: 0 auto 28px;
}

.hero-title{
  font-family: var(--font-display);
  font-weight:800;
  letter-spacing:-0.035em;
  line-height:1.04;
  margin: 0 0 32px;
  font-size: clamp(2.4rem, 5.6vw, 4.2rem);
  text-align: center;
}
.hero-accent{
  background: linear-gradient(135deg, var(--accent) 30%, var(--accent-strong) 70%);
  -webkit-background-clip:text; background-clip:text;
  color:transparent;
}
.hero-sep{ color: var(--text); margin-left:1px; }
.hero-sub{
  display:inline-block;
  font-family: var(--font-display);
  font-weight:700;
  color: var(--text);
  font-size: 0.52em;
  letter-spacing:-0.02em;
  line-height:1.2;
  margin-top: 12px;
}

.authors-grid{
  display:flex; flex-wrap:wrap; gap: 14px 28px;
  margin: 8px 0 6px;
  justify-content: center;
}
.author-card{ font-size: 0.95rem; color:var(--text); }
.author-name{ font-weight:500; }
.author-card sup{
  color: var(--accent); font-weight:600;
  margin-left:1px; font-size:0.75em;
}
.affil-legend{
  font-size:0.85rem; color:var(--text-mute);
  margin: 4px 0 28px;
  text-align: center;
}
.affil-legend sup{ color:var(--accent); margin-right:2px; }
.affil-foot{
  display: inline-block;
  margin-top: 4px;
  font-size: 0.78rem;
  color: var(--text-mute);
}

.links-row{
  display:flex; gap:10px; flex-wrap:wrap;
  margin: 0 0 8px;
  justify-content: center;
}
.link-btn{
  display:inline-flex; align-items:center; gap:8px;
  padding: 9px 16px;
  background:var(--surface);
  color:var(--text);
  border:1px solid var(--border);
  border-radius: 999px;
  font-weight: 500; font-size:0.92rem;
  text-decoration:none;
  transition: all 0.18s ease;
  box-shadow: 0 1px 2px rgba(0,0,0,0.03);
}
.link-btn:hover{
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent-strong);
  text-decoration:none;
  transform: translateY(-1px);
  box-shadow: var(--shadow-1);
}
.link-btn svg{ width:16px; height:16px; stroke: currentColor; }

/* Teaser */
.hero-teaser{
  margin: 12px 0 32px;
  padding:0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow:hidden;
  box-shadow: var(--shadow-1);
}
.hero-teaser img{
  display:block; width:100%; height:auto;
}

/* TL;DR */
.tldr{
  position:relative;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 18px 22px 18px 28px;
  margin: 24px 0;
  border-left: 4px solid var(--accent);
  box-shadow: var(--shadow-1);
}
.tldr-tag{
  display:block;
  font-size: 0.74rem; letter-spacing:0.16em;
  font-weight:700; text-transform:uppercase;
  color: var(--accent);
  margin-bottom: 6px;
}
.tldr p{ margin: 0; font-size: 1.0rem; line-height:1.55; }

/* Stat strip — unique to this page */
.stat-strip{
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin: 30px 0 8px;
}
.stat-card{
  position:relative;
  background: var(--surface);
  border:1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 18px 18px;
  text-align:left;
  transition: transform 0.18s, box-shadow 0.18s;
  overflow:hidden;
}
.stat-card::after{
  content:"";
  position:absolute; top:0; left:0; right:0; height:3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-cyan));
  opacity:0.85;
}
.stat-card:hover{
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
}
.stat-num{
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 700;
  line-height:1;
  color: var(--accent-strong);
  letter-spacing:-0.02em;
}
.stat-unit{
  font-size: 0.55em; color:var(--text-soft);
  font-weight: 500;
  margin-left: 2px;
}
.stat-label{
  font-size: 0.85rem;
  color: var(--text-soft);
  margin-top: 8px;
  line-height:1.35;
}

/* =============== FIGURES =============== */
.figure-wide, .figure-medium{
  margin: 8px 0 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow:hidden;
  box-shadow: var(--shadow-1);
  transition: box-shadow 0.25s, transform 0.25s;
}
.figure-medium{ max-width: 760px; margin-left:auto; margin-right:auto; }
.figure-wide img, .figure-medium img{
  display:block; width:100%; height:auto; background:#fff;
}
.figure-wide figcaption, .figure-medium figcaption{
  padding: 14px 22px 18px;
  font-size: 0.92rem; color:var(--text-soft);
  border-top: 1px solid var(--border-soft);
  background: linear-gradient(180deg, var(--surface), var(--surface-2));
}
.figure-wide:hover, .figure-medium:hover{
  box-shadow: var(--shadow-2);
}
.figure-arch{
  background:#fff;
}
.figure-arch img{
  width:132%;
  max-width:none;
  margin: -27% -16% -36%;
}

/* =============== DUAL FIGURE (arch + pareto side by side) =============== */
/* Flex (not grid) so each panel's height is its own — no shared row height.
   This lets the wide+short framework box be short, and the square Pareto box
   be tall, side-by-side without empty space inside either. */
.dual-figure{
  display: flex;
  align-items: stretch;        /* match box heights — Framework grows to Pareto's height */
  gap: 22px;
  margin: 8px 0 18px;
}
.dual-fig-item{
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-1);
  display: flex;
  flex-direction: column;
  min-width: 0;
  transition: box-shadow 0.25s, transform 0.25s;
}
/* Framework ~58%, Pareto ~42% — giving the portrait Pareto chart a wider
   column so it reads larger than the previous narrow slice. */
.dual-fig-item:nth-child(1){ flex: 1.4 1 0; }
.dual-fig-item:nth-child(2){ flex: 1 1 0; }

.dual-fig-item:hover{ box-shadow: var(--shadow-2); }
.dual-fig-tag{
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 12px 18px 4px;
  flex: 0 0 auto;
}
.dual-fig-item img{
  display: block;
  width: 100%;
  flex: 1 1 auto;        /* image fills the rest of the box vertically */
  min-height: 0;
  height: auto;
  max-height: 340px;     /* unified cap; gives Pareto more vertical room */
  object-fit: contain;   /* show the full diagram / chart, never crop */
  background: #fff;
  padding: 6px 12px 12px;
}

@media (max-width: 820px){
  .dual-figure{ flex-direction: column; }
  .dual-fig-item:nth-child(1),
  .dual-fig-item:nth-child(2){ flex: 1 1 auto; }
}

/* =============== LIGHTBOX (Framework / Pareto enlarge on click) =============== */
.lightbox-trigger{
  cursor: zoom-in;
  transition: opacity 0.18s ease, transform 0.18s ease;
}
.lightbox-trigger:hover{
  opacity: 0.93;
}
.lightbox-trigger:focus-visible{
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.lightbox-overlay{
  position: fixed;
  inset: 0;
  background: rgba(15, 14, 28, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4vh 4vw;
  z-index: 10000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.22s ease;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  cursor: zoom-out;
}
.lightbox-overlay.visible{
  opacity: 1;
  pointer-events: auto;
}
.lightbox-overlay img{
  display: block;
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 10px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.55);
  background: #fff;
  cursor: default;
  /* Subtle zoom-in animation when opening */
  animation: lbZoomIn 0.24s ease both;
}
@keyframes lbZoomIn{
  from{ transform: scale(0.94); opacity: 0; }
  to  { transform: scale(1);    opacity: 1; }
}
.lightbox-close{
  position: absolute;
  top: 18px; right: 22px;
  width: 42px; height: 42px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: rgba(20, 18, 36, 0.7);
  color: #fff;
  font-size: 1.6rem;
  line-height: 1;
  font-weight: 400;
  cursor: pointer;
  transition: background-color 0.16s ease, transform 0.16s ease;
}
.lightbox-close:hover{
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  border-color: var(--accent-strong);
  transform: scale(1.05);
}

/* =============== TEXT BLOCKS / LISTS =============== */
.text-block{
  margin: 22px auto 0;
  max-width: 1080px;
  display:grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}
.text-block p{
  margin: 0;
  font-size: 1.0rem;
  line-height:1.62;
}
.text-block p + p{
  border-left: 1px solid var(--border-soft);
  padding-left: 24px;
}

/* Full-width single-paragraph variant — matches the figure above it */
.text-block-wide{
  display: block;
  max-width: none;
  margin: 22px 0 0;
}
.text-block-wide p{
  margin: 0;
}
.text-block-wide p + p{
  border-left: none;
  padding-left: 0;
  margin-top: 1em;
}

.numbered-list{
  margin-top: 28px;
  display:grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap:14px;
}
/* 3-column variant for the 3-step method list */
.numbered-list-3{
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.num-item{
  display:grid;
  grid-template-columns: 36px 1fr;
  gap: 14px;
  align-items:flex-start;
  background: var(--surface);
  padding: 16px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
}
.num-item:hover{
  transform: translateX(2px);
  border-color: var(--accent);
  box-shadow: var(--shadow-1);
}
.num-mark{
  display:inline-flex; align-items:center; justify-content:center;
  width:30px; height:30px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: 700;
  border-radius: 50%;
  font-family: var(--font-serif);
}
/* Title (the leading <strong class="hl">) sits on its own line above the body */
.num-item > div > .hl:first-child{
  display: block;
  margin-bottom: 8px;
}

/* =============== TABLE =============== */
.table-wrap{ overflow-x:auto; margin: 18px 0 10px;
             border-radius: var(--radius);
             border: 1px solid var(--border);
             background: var(--surface);
             box-shadow: var(--shadow-1); }
.results-table{
  width:100%; border-collapse: collapse;
  font-size: 0.92rem;
  min-width: 700px;
}
.results-table th, .results-table td{
  padding: 11px 14px;
  text-align:center;
}
.results-table thead th{
  font-weight:600; font-size: 0.84rem;
  color: var(--text-soft);
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  letter-spacing:0.02em;
}
.results-table tbody tr{
  transition: background-color 0.15s;
}
.results-table tbody tr:hover:not(.row-sep){
  background: var(--surface-2);
}
.results-table .th-left{ text-align:left; padding-left:22px; }
.row-sep{ height: 1px; }
.row-sep td{
  padding:0; height:1px;
  background: var(--border-soft);
}
.row-gt td{ color: var(--text-mute); font-style:italic; }
.row-ours{
  background: linear-gradient(90deg, var(--accent-soft), transparent 70%);
  border-left: 3px solid var(--accent);
}
.row-ours td{ color: var(--accent-strong); font-weight:600; }

/* =============== PREVIEW (mouse-position-driven horizontal scroll) =============== */
/* The row scrolls based on where the cursor is — hover left to pan left,
   hover right to pan right, deadzone in the middle. The native scrollbar
   is hidden (touch swipe still works on touch devices). */
.preview-scroll{
  position: relative;
  overflow-x: auto;
  overflow-y: hidden;
  margin: 10px 0 8px;
  scrollbar-width: none;                 /* Firefox: hide */
  -webkit-overflow-scrolling: touch;
  /* Soft fades on the left + right edges hint that the row can pan */
  -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 32px, #000 calc(100% - 32px), transparent 100%);
          mask-image: linear-gradient(90deg, transparent 0, #000 32px, #000 calc(100% - 32px), transparent 100%);
}
.preview-scroll::-webkit-scrollbar{ display: none; }   /* Chrome/Safari: hide */
.preview-scroll.hover-active{ cursor: ew-resize; }     /* cue when JS hover-scroll is armed */

.preview-track{
  display: flex;
  gap: 14px;
  padding: 4px 2px 8px;
}
.preview-cell{
  flex: 0 0 auto;
  width: clamp(320px, 38vw, 480px);
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-1);
  transition: box-shadow 0.18s, transform 0.18s;
}
.preview-cell:hover{
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
}
.preview-cell video{
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: #000;
}

/* =============== VIDEO HERO + GRID + PLACEHOLDERS =============== */
.video-frame{
  position:relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow:hidden;
  box-shadow: var(--shadow-1);
  margin: 0;
}
.video-frame .placeholder-overlay{
  position:absolute;
  inset:0;
  display:none;
  align-items:center;
  justify-content:center;
  pointer-events:none;
}
.video-frame[data-empty="true"] .placeholder-overlay{
  display:flex;
}
.video-hero{
  aspect-ratio: 16 / 9;
  max-width: 100%;
  margin: 28px 0 28px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-2);
  scroll-margin-top: 24px;
}
.video-frame video{
  display:block; width:100%; height:100%; object-fit:contain;
  background:#111119;
}

.placeholder-frame{
  aspect-ratio: 9 / 16;
}
/* Landscape variant — used by qual-ours grid + vs-baselines rows (TalkVid is 16:9) */
.video-landscape{
  aspect-ratio: 16 / 9;
}
.video-landscape video{
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}
.placeholder-inner{
  position:absolute; inset:0;
  display:flex; align-items:center; justify-content:center;
  background:
    repeating-linear-gradient(45deg,
      var(--surface-2),
      var(--surface-2) 12px,
      var(--surface) 12px,
      var(--surface) 24px);
  color: var(--text-mute);
  font-size: 0.92rem; font-weight: 600;
  letter-spacing: 0.04em;
}
.video-hero[data-empty="true"] .placeholder-overlay{
  background:
    repeating-linear-gradient(45deg,
      rgba(245, 242, 251, 0.95),
      rgba(245, 242, 251, 0.95) 12px,
      rgba(255, 255, 255, 0.95) 12px,
      rgba(255, 255, 255, 0.95) 24px);
}
.placeholder-pill{
  display:inline-block; padding: 10px 18px;
  background: var(--surface);
  color: var(--text-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.92rem; box-shadow: var(--shadow-1);
}
.placeholder-pill code{ font-size: 0.9em; }

.video-grid{
  display:grid; gap: 14px;
  margin: 16px 0 6px;
}
.video-grid.grid-3{
  grid-template-columns: repeat(3, 1fr);
}
.video-grid figcaption{
  padding: 8px 12px;
  font-size: 0.84rem; color: var(--text-soft);
  text-align: center;
  border-top:1px solid var(--border-soft);
}

/* =============== VS-BASELINES — sample picker + 3×2 grid =============== */

/* Testset arrow nav — sits above the sample picker.
   [◀]  Test Set / TalkVid  [▶] */
.vs-testset-nav{
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin: 10px 0 18px;
}
.vs-tset-arrow{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px; height: 44px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--accent-strong);
  cursor: pointer;
  transition: all 0.18s ease;
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
  padding: 0;
}
.vs-tset-arrow:hover{
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #fff;
  border-color: var(--accent-strong);
  transform: translateY(-1px);
  box-shadow: var(--shadow-1);
}
.vs-tset-arrow:active{ transform: none; }
.vs-tset-arrow svg{ display: block; }
.vs-tset-display{
  min-width: 180px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 4px 12px;
}
.vs-tset-label{
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-mute);
  line-height: 1;
}
.vs-tset-name{
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--accent-strong);
  letter-spacing: -0.015em;
  line-height: 1.15;
  transition: opacity 0.16s ease, transform 0.16s ease;
}
.vs-tset-name.changing{
  opacity: 0;
  transform: translateY(-2px);
}

/* Top control row: sample picker on the left, magnifier toggle on the right */
.vs-controls{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  margin: 6px 0 22px;
}

/* Magnifier toggle (sliding switch) */
.vs-zoom-toggle{
  display: inline-flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-soft);
}
.vs-zoom-toggle:hover{ color: var(--text); }
.vs-zoom-toggle input{
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.vs-zoom-slider{
  display: inline-block;
  position: relative;
  width: 40px;
  height: 22px;
  background: var(--border);
  border-radius: 999px;
  transition: background-color 0.2s ease;
  flex-shrink: 0;
}
.vs-zoom-slider::after{
  content: "";
  position: absolute;
  top: 2px; left: 2px;
  width: 18px; height: 18px;
  background: white;
  border-radius: 50%;
  box-shadow: 0 1px 3px rgba(0,0,0,0.25);
  transition: transform 0.2s ease;
}
.vs-zoom-toggle input:checked + .vs-zoom-slider{
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
}
.vs-zoom-toggle input:checked + .vs-zoom-slider::after{
  transform: translateX(18px);
}
.vs-zoom-toggle input:focus-visible + .vs-zoom-slider{
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.vs-zoom-label{ line-height: 1; }

/* Row-picker buttons */
.vs-picker{
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.vs-pick-btn{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  font-family: var(--font);
  font-weight: 500;
  font-size: 0.92rem;
  color: var(--text-soft);
  transition: all 0.18s ease;
  box-shadow: 0 1px 2px rgba(0,0,0,0.03);
}
.vs-pick-btn:hover{
  border-color: var(--accent);
  color: var(--accent-strong);
  background: var(--accent-soft);
  transform: translateY(-1px);
  box-shadow: var(--shadow-1);
}
.vs-pick-btn.active{
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: white;
  border-color: var(--accent-strong);
  box-shadow: var(--shadow-1);
}
.vs-pick-num{
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  opacity: 0.75;
}
.vs-pick-btn.active .vs-pick-num{ opacity: 0.92; }

/* The stage that holds the 3 grid panels (only one visible at a time) */
.vs-stage{
  margin: 4px 0 8px;
}
.vs-grid-panel{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(2, auto);
  gap: 16px;
  animation: vsFadeIn 0.28s ease both;
}
.vs-grid-panel[hidden]{ display: none; }

@keyframes vsFadeIn{
  from{ opacity: 0; transform: translateY(4px); }
  to  { opacity: 1; transform: none; }
}

/* Each cell */
.vs-cell{
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-1);
  transition: box-shadow 0.18s, transform 0.18s;
}
.vs-cell:hover{
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
}
.vs-cell video{
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: #000;
}
.vs-cell figcaption{
  padding: 9px 14px;
  font-size: 0.88rem;
  text-align: center;
  font-weight: 500;
  color: var(--text-soft);
  background: linear-gradient(180deg, var(--surface), var(--surface-2));
  border-top: 1px solid var(--border-soft);
}

/* Highlight modifiers */
.vs-cell.vs-input{
  border-color: var(--text-mute);
}
.vs-cell.vs-input figcaption{
  color: var(--text);
  font-weight: 700;
}
.vs-cell.vs-cell-ours{
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft), var(--shadow-1);
}
.vs-cell.vs-cell-ours figcaption{
  color: var(--accent-strong);
  font-weight: 700;
  background: linear-gradient(180deg, var(--accent-soft), var(--surface));
}

/* Cursor hint when the magnifier is armed */
.vs-cell.vs-cell-zoomable{ cursor: crosshair; }

/* Magnifier "loupe" — singleton element, follows the cursor at an offset */
.vs-lens{
  position: fixed;
  top: 0; left: 0;
  pointer-events: none;
  border: 2px solid var(--accent);
  border-radius: 12px;
  overflow: hidden;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.5),
    0 12px 32px rgba(87, 51, 201, 0.32),
    0 4px 12px rgba(0, 0, 0, 0.25);
  z-index: 9999;
  background: #000;
  opacity: 0;
  transition: opacity 0.14s ease;
  will-change: transform, opacity;
}
.vs-lens.visible{ opacity: 1; }
.vs-lens video{
  display: block;
  position: absolute;
  top: 0; left: 0;
  object-fit: cover;
  will-change: transform;
}
.vs-lens-badge{
  position: absolute;
  right: 6px; bottom: 6px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 700;
  color: white;
  background: rgba(0, 0, 0, 0.55);
  padding: 2px 8px;
  border-radius: 999px;
  pointer-events: none;
}

/* Responsive: 2 cols on mid, 1 col on small */
@media (max-width: 900px){
  .vs-grid-panel{ grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px){
  .vs-grid-panel{ grid-template-columns: 1fr; }
  .vs-pick-btn{ padding: 8px 14px; font-size: 0.86rem; }
  .vs-controls{ flex-direction: column; align-items: flex-start; gap: 12px; }
  .vs-testset-nav{ gap: 10px; }
  .vs-tset-arrow{ width: 38px; height: 38px; }
  .vs-tset-display{ min-width: 120px; padding: 4px 6px; }
  .vs-tset-name{ font-size: 1.15rem; }
}
/* Magnifier is desktop-only */
@media (hover: none){
  .vs-zoom-toggle{ display: none; }
}

/* =============== BIBTEX =============== */
.bib-wrap{
  position:relative;
  background: var(--surface);
  border:1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  margin-top: 16px;
}
.bib{
  margin:0; padding: 18px 20px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.5;
  overflow-x: auto;
  color: var(--text);
}
.copy-btn{
  position:absolute; top: 12px; right: 12px;
  background: var(--surface-2);
  color: var(--accent-strong);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 12px;
  font-size: 0.78rem; font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}
.copy-btn:hover{
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}
.copy-btn.copied{
  background: var(--accent-cyan);
  color: white;
  border-color: var(--accent-cyan);
}

/* =============== FOOTER =============== */
.footer{
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--border-soft);
  color: var(--text-mute);
  font-size: 0.84rem;
}

/* =============== Scroll-in fade =============== */
.sec, .figure-wide, .figure-medium, .num-item, .stat-card, .video-frame, .vs-row, .results-table{
  /* JS-driven opacity fade is opt-in */
}
.fade-in{ animation: fadeUp 0.6s ease both; }
@keyframes fadeUp{
  from{ opacity:0; transform: translateY(8px); }
  to  { opacity:1; transform: none; }
}

/* =============== RESPONSIVE =============== */
@media (max-width: 1080px){
  :root{ --sidebar-w: 200px; }
}
@media (max-width: 920px){
  .stat-strip{ grid-template-columns: repeat(2, 1fr); }
  .video-grid.grid-3{ grid-template-columns: repeat(2, 1fr); }
  .text-block{
    max-width: 74ch;
    grid-template-columns: 1fr;
    margin-left:0;
    margin-right:0;
  }
  .text-block p + p{
    border-left:none;
    padding-left:0;
    padding-top: 16px;
    border-top: 1px solid var(--border-soft);
  }
  .numbered-list{ grid-template-columns: 1fr; }
}
@media (max-width: 720px){
  .layout{ flex-direction:column; }
  .sidebar{
    position:relative; height:auto; width:100%;
    flex: 0 0 auto;
    border-right:none; border-bottom: 1px solid var(--border);
    padding: 18px 22px;
  }
  .sidebar-nav{ flex-direction:row; flex-wrap:wrap; gap: 4px; }
  .sidebar-foot{ display:none; }
  .nav-link{ padding: 6px 10px; }
  .nav-link.active{ background: transparent; border-left:none; border-bottom: 2px solid var(--accent); border-radius:0; }

  .content{ padding: 32px 18px 64px; }
  .sec{ margin-bottom: 56px; }
  .stat-strip{ grid-template-columns: 1fr 1fr; gap: 10px; }
  .video-grid.grid-3{ grid-template-columns: 1fr 1fr; }
  .figure-arch img{
    width:150%;
    margin: -31% -25% -42%;
  }
  .placeholder-pill{
    max-width: calc(100% - 28px);
    white-space: normal;
    text-align: center;
  }
  /* Smaller cells on mobile so each video still fits side-by-side cleanly
     when scrolling horizontally */
  :root{ --vs-cell-w: 280px; }
}