:root{
  --bordeaux:#8a1f3f;       /* Université de Bordeaux accent */
  --bordeaux-dk:#6d162f;
  --tubaf:#0a4f63;          /* TU Bergakademie Freiberg accent */
  --tubaf-dk:#073847;
  --ink:#1c1f26;
  --muted-ink:#5a6270;
  --line:#e3e6eb;
  --bg:#ffffff;
  --bg-alt:#f6f7f9;
  --maxw:1080px;
  --radius:12px;
  --shadow:0 1px 3px rgba(20,25,40,.07),0 8px 24px rgba(20,25,40,.06);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:64px}
body{
  margin:0;color:var(--ink);background:var(--bg);
  font-family:"Source Sans 3",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased;
}
img,video{max-width:100%;display:block}
a{color:var(--bordeaux);text-decoration:none}
a:hover{text-decoration:underline}
sup{font-size:.66em}

/* ---------- nav ---------- */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(8px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:var(--maxw);margin:0 auto;padding:10px 20px;
  display:flex;align-items:center;justify-content:space-between;gap:16px}
.nav-brand{font-weight:700;color:var(--tubaf-dk);letter-spacing:.02em}
.nav-links{display:flex;gap:18px;flex-wrap:wrap;align-items:center}
.nav-links a{color:var(--muted-ink);font-weight:600;font-size:15px}
.nav-links a:hover{color:var(--bordeaux);text-decoration:none}
.nav-code{padding:5px 12px;border:1px solid var(--line);border-radius:999px}

/* ---------- hero ---------- */
.hero{max-width:var(--maxw);margin:0 auto;padding:42px 20px 8px;text-align:center}
.logos{display:flex;flex-wrap:wrap;gap:26px;justify-content:center;align-items:center;margin-bottom:30px}
.logos a{display:inline-flex;align-items:center;line-height:0;transition:opacity .12s ease,transform .12s ease}
.logos a:hover{opacity:.7;transform:translateY(-1px)}
.logos img{height:50px;width:auto;object-fit:contain;filter:grayscale(.15)}
.logos img[src*="tubaf"]{height:78px}      /* TUBAF mark reads small at 50px */
.logos img[src*="ensam"]{height:40px}      /* wide wordmark — keep it from dominating */
.logos-sm img{height:34px;filter:grayscale(.4);opacity:.85}
.logos-sm img[src*="tubaf"]{height:46px}
.logos-sm img[src*="ensam"]{height:28px}
.title{font-family:"Source Serif 4",Georgia,serif;font-weight:600;
  font-size:clamp(1.6rem,3.4vw,2.5rem);line-height:1.18;letter-spacing:-.01em;
  margin:.2em auto .6em;max-width:18ch;max-width:880px;color:var(--ink)}
.authors{margin:.4em 0;font-size:1.06rem}
.author{display:inline-block;margin:0 .55em;white-space:nowrap}
.corr{margin-left:3px;font-size:.8em;color:var(--bordeaux)}
.affils{display:flex;flex-direction:column;gap:2px;color:var(--muted-ink);
  font-size:.86rem;margin:.7em auto 0;max-width:760px}
.venue{color:var(--muted-ink);font-size:.95rem;margin:.9em 0 1.2em}
.venue em{color:var(--tubaf-dk);font-style:italic}

.cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-bottom:30px}
.btn{display:inline-flex;align-items:center;gap:7px;padding:10px 20px;border-radius:999px;
  border:1px solid var(--line);background:#fff;color:var(--ink);font-weight:600;font-size:15px;
  transition:transform .12s ease,box-shadow .12s ease}
.btn:hover{transform:translateY(-1px);box-shadow:var(--shadow);text-decoration:none}
.btn-primary{background:var(--bordeaux);border-color:var(--bordeaux);color:#fff}
.btn-primary:hover{background:var(--bordeaux-dk)}
.btn-disabled{opacity:.55;cursor:not-allowed;pointer-events:none}
.soon{font-size:.7em;text-transform:uppercase;letter-spacing:.06em;color:var(--muted-ink);
  border:1px solid var(--line);border-radius:6px;padding:1px 5px;margin-left:2px}

.hero-media{margin:8px 0 0}
.hero-media video{width:100%;max-width:820px;margin:0 auto;border-radius:var(--radius);box-shadow:var(--shadow);background:#000}
figcaption{color:var(--muted-ink);font-size:.88rem;margin-top:10px;line-height:1.5}

/* ---------- sections ---------- */
.section{max-width:var(--maxw);margin:0 auto;padding:54px 20px}
/* full-bleed background while keeping the same centered, left-aligned column */
.section-alt{background:var(--bg-alt);box-shadow:0 0 0 100vmax var(--bg-alt);
  clip-path:inset(0 -100vmax)}
.section h2{font-family:"Source Serif 4",serif;font-size:1.7rem;font-weight:600;
  margin:0 0 .6em;padding-bottom:.3em;border-bottom:2px solid var(--bordeaux);display:inline-block}
.section h3{font-size:1.18rem;margin:1.8em 0 .4em;color:var(--tubaf-dk)}
.lead{font-size:1.07rem}
/* keep the detailed coupled-architecture diagram from dominating */
#method > .fig img{max-width:760px}

/* coupling equations */
.equations{margin:1.5em auto;max-width:760px}
.equations p{margin:.9em 0 .1em;color:var(--ink)}
.eq{overflow-x:auto;overflow-y:hidden;padding:4px 0;text-align:center;font-size:1.02rem}

.keywords{list-style:none;padding:0;display:flex;flex-wrap:wrap;gap:8px;margin:1.6em 0 0}
.keywords li{background:#fff;border:1px solid var(--line);color:var(--muted-ink);
  border-radius:999px;padding:5px 13px;font-size:.85rem}

/* ---------- figures ---------- */
.fig{margin:1.4em 0;text-align:center}
.fig img{margin:0 auto;border-radius:8px;border:1px solid var(--line);background:#fff}
.fig img[src*="lstm_strain_path"]{max-width:600px}   /* tall plot — keep it compact */
.fig-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
@media(max-width:760px){.fig-grid{grid-template-columns:1fr}}
.vid-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin:1.2em 0}
@media(max-width:760px){.vid-grid{grid-template-columns:1fr}}
.fig video{width:100%;border-radius:8px;border:1px solid var(--line);background:#000}

/* ---------- video player + scrubber ---------- */
.tabs{display:flex;flex-wrap:wrap;gap:8px;margin:.6em 0 1em}
.tab{border:1px solid var(--line);background:#fff;color:var(--muted-ink);
  padding:7px 16px;border-radius:999px;font:inherit;font-weight:600;font-size:14px;cursor:pointer;
  transition:all .12s ease}
.tab:hover{border-color:var(--bordeaux);color:var(--bordeaux)}
.tab.is-active{background:var(--tubaf);border-color:var(--tubaf);color:#fff}
.tabs-sm .tab{padding:4px 12px;font-size:13px}

.player{background:#0c0d10;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.player video{width:100%;background:#0c0d10}
.player-controls{display:flex;align-items:center;gap:14px;padding:10px 14px;background:#15171c}
.play-btn{flex:0 0 auto;width:38px;height:38px;border-radius:50%;border:none;cursor:pointer;
  background:var(--bordeaux);color:#fff;font-size:14px;line-height:1;display:grid;place-items:center}
.play-btn:hover{background:var(--bordeaux-dk)}
.scrub{flex:1;-webkit-appearance:none;appearance:none;height:5px;border-radius:5px;
  background:#3a3d45;outline:none;cursor:pointer}
.scrub::-webkit-slider-thumb{-webkit-appearance:none;width:16px;height:16px;border-radius:50%;
  background:#fff;border:3px solid var(--bordeaux);cursor:pointer}
.scrub::-moz-range-thumb{width:14px;height:14px;border-radius:50%;background:#fff;
  border:3px solid var(--bordeaux);cursor:pointer}
.time-label{flex:0 0 auto;color:#c7cbd4;font-size:13px;font-variant-numeric:tabular-nums;min-width:46px;text-align:right}

/* ---------- comparison divider ---------- */
.compare{position:relative;margin:1em 0;border-radius:8px;overflow:hidden;
  border:1px solid var(--line);user-select:none;touch-action:none;background:#fff}
.compare-img{width:100%;display:block;pointer-events:none}
.compare-bottom{position:relative;z-index:1}
.compare-top{position:absolute;inset:0;z-index:2;clip-path:inset(0 50% 0 0)}
.compare-divider{position:absolute;top:0;bottom:0;left:50%;z-index:3;width:2px;
  background:var(--bordeaux);transform:translateX(-1px);pointer-events:none}
.compare-handle{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
  width:38px;height:38px;border-radius:50%;background:#fff;border:2px solid var(--bordeaux);
  color:var(--bordeaux);display:grid;place-items:center;font-size:17px;box-shadow:var(--shadow)}
.compare-tag{position:absolute;top:8px;z-index:4;font-size:12px;font-weight:700;color:#fff;
  background:rgba(20,22,28,.62);padding:3px 9px;border-radius:6px;pointer-events:none}
.compare-tag-left{left:8px}
.compare-tag-right{right:8px}
.compare-range{position:absolute;inset:0;z-index:5;width:100%;height:100%;margin:0;opacity:0;cursor:ew-resize}

/* ---------- performance ---------- */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:.5em 0 2em}
@media(max-width:680px){.cards{grid-template-columns:1fr}}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;text-align:center;box-shadow:var(--shadow)}
.card-num{font-family:"Source Serif 4",serif;font-size:2.1rem;font-weight:700;color:var(--bordeaux);line-height:1}
.card-lbl{color:var(--muted-ink);font-size:.9rem;margin-top:8px}
.chart-head{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.chart-head h3{margin:.4em 0}
.chart-wrap{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:16px;height:420px;box-shadow:var(--shadow)}

/* hidden-state analysis */
.hidden-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:1.2em 0 .6em}
@media(max-width:820px){.hidden-grid{grid-template-columns:1fr}}
.hmini{margin:0;text-align:center}
.chart-sm{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:10px;height:280px;box-shadow:var(--shadow)}
.hs-control{display:flex;align-items:center;gap:14px;background:#15171c;
  border-radius:var(--radius);padding:10px 14px}
.hs-label{flex:0 0 auto;color:#c7cbd4;font-size:13px;font-variant-numeric:tabular-nums;
  min-width:62px;text-align:right}
.note{color:var(--muted-ink);font-size:.88rem;margin-top:12px}
.subnote{color:var(--muted-ink);font-size:.88rem;border-left:3px solid var(--tubaf);padding-left:12px;margin-top:14px}

/* ---------- highlights ---------- */
.highlights{list-style:none;padding:0;margin:0;display:grid;gap:12px}
.highlights li{position:relative;padding:14px 16px 14px 46px;background:var(--bg-alt);
  border:1px solid var(--line);border-radius:var(--radius)}
.highlights li::before{content:"\2192";position:absolute;left:18px;top:14px;
  color:var(--bordeaux);font-weight:700}

/* ---------- cite ---------- */
.cite-line{color:var(--muted-ink)}
.bibtex-wrap{position:relative;margin-top:1em}
.bibtex-wrap pre{background:#15171c;color:#e6e9ef;border-radius:var(--radius);
  padding:20px;overflow-x:auto;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:13px;line-height:1.55}
.copy-btn{position:absolute;top:12px;right:12px;background:#2a2d35;color:#fff;border:none;
  border-radius:7px;padding:6px 14px;font:inherit;font-size:13px;font-weight:600;cursor:pointer}
.copy-btn:hover{background:var(--bordeaux)}
.copy-btn.copied{background:#1e7d4f}

/* ---------- footer ---------- */
.footer{border-top:1px solid var(--line);padding:34px 20px;text-align:center;color:var(--muted-ink)}
.footer .logos{margin-bottom:16px}
.footer p{font-size:.85rem;margin:0}