:root{
  --ink:#0f172a;        /* slate-900 */
  --ink2:#334155;       /* slate-700 */
  --muted:#64748b;      /* slate-500 */
  --line:#e2e8f0;       /* slate-200 */
  --bg:#ffffff;
  --bg2:#f8fafc;        /* slate-50  */
  --navy:#0f2440;       /* hero bg   */
  --accent:#2457d6;     /* professional blue */
  --accent-2:#1b3e9e;
  --ir:#d97706;         /* amber (thermal) */
  --vis:#2563eb;        /* blue (visible)  */
  --shadow:0 14px 40px -22px rgba(15,36,64,.28);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,sans-serif;color:var(--ink);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
.wrap{max-width:1040px;margin:0 auto;padding:0 24px}
.accent{color:var(--accent)}
h1,h2,h3{letter-spacing:-.01em}

/* NAV */
#nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(10px);background:rgba(255,255,255,.9);border-bottom:1px solid var(--line)}
.nav-inner{max-width:1160px;margin:0 auto;padding:13px 24px;display:flex;align-items:center;justify-content:space-between}
.brand{font-weight:800;font-size:1.2rem;color:var(--ink);letter-spacing:-.02em}
.nav-links{display:flex;gap:22px;align-items:center}
.nav-links a{color:var(--ink2);font-weight:500;font-size:.92rem}
.nav-links a:hover{color:var(--accent)}
.btn-ghost{border:1px solid var(--line);padding:7px 14px;border-radius:8px;font-weight:600}
.btn-ghost:hover{border-color:var(--accent);background:var(--bg2)}
#burger{display:none;background:none;border:none;cursor:pointer;color:var(--ink)}

/* HERO */
.hero{position:relative;background:var(--navy);color:#fff;text-align:center;padding:96px 24px 86px;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(255,255,255,.055) 1px,transparent 1px);background-size:30px 30px;mask:radial-gradient(130% 80% at 50% 0%,#000 40%,transparent 100%)}
.hero-content{position:relative;max-width:900px;margin:0 auto}
.tag{display:inline-block;font-size:.74rem;letter-spacing:.03em;color:#9fb4d6;border:1px solid rgba(255,255,255,.16);padding:6px 14px;border-radius:999px;margin-bottom:28px}
.hero h1{font-family:'Newsreader',Georgia,serif;font-weight:600;font-size:clamp(2rem,5vw,3.5rem);line-height:1.12}
.hero .accent{color:#7aa2ff}
.authors{margin:26px 0 2px;display:flex;gap:18px;justify-content:center;align-items:center;flex-wrap:wrap;color:#d4def0;font-size:1.02rem}
.authors span{font-weight:600;color:#fff}
.authors a{color:#9fb4d6;border-bottom:1px solid rgba(159,180,214,.5);font-size:.9rem}
.authors a:hover{color:#fff}
.hero-btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin:30px 0 4px}
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--accent);color:#fff;font-weight:600;font-size:.95rem;padding:11px 20px;border-radius:9px;transition:background .2s,transform .2s,border-color .2s}
.btn:hover{background:var(--accent-2);transform:translateY(-2px)}
.btn-o{background:transparent;border:1px solid rgba(255,255,255,.28);color:#fff}
.btn-o:hover{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.5)}
.stat-row{display:flex;gap:46px;justify-content:center;flex-wrap:wrap;margin-top:46px}
.stat b{display:block;font-size:2.1rem;font-weight:700;color:#fff}
.stat span{font-size:.8rem;color:#9fb4d6}

/* SECTIONS */
.sec{padding:84px 0}
.sec.alt{background:var(--bg2)}
.sec h2{font-size:clamp(1.55rem,3.2vw,2.1rem);font-weight:700;margin-bottom:10px;display:flex;align-items:baseline;gap:14px}
.sec h2 .num{font-size:.82rem;color:var(--accent);font-weight:700;border:1px solid var(--line);background:#fff;padding:3px 9px;border-radius:7px}
.sec h3{font-size:1.25rem;font-weight:700}
.lead{font-size:1.1rem;color:var(--ink2);max-width:780px;margin:6px 0 30px}
.note{font-size:.9rem;color:var(--muted);max-width:760px;margin-top:14px}
.mt{margin-top:52px}

/* CARDS */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:18px}
.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px;transition:transform .22s,box-shadow .22s,border-color .22s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#cdd7e6}
.card .ic{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:11px;background:#eef3fe;color:var(--accent);margin-bottom:14px}
.card .ic svg{width:22px;height:22px}
.card h3{font-size:1.08rem;margin-bottom:8px}
.card p{color:var(--muted);font-size:.94rem}

/* FIGURE */
.fig{margin:32px 0;text-align:center}
.fig img{max-width:100%;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);background:#fff}
.fig figcaption{color:var(--muted);font-size:.9rem;margin-top:13px}

/* STAGES */
.stages{display:grid;grid-template-columns:repeat(auto-fit,minmax(208px,1fr));gap:16px;margin-top:30px}
.stage{background:#fff;border:1px solid var(--line);border-radius:12px;padding:22px;position:relative}
.stage span{position:absolute;top:-13px;left:20px;width:28px;height:28px;border-radius:8px;background:var(--accent);color:#fff;font-weight:700;display:grid;place-items:center;font-size:.9rem}
.stage b{display:block;margin:10px 0 6px}
.stage p{color:var(--muted);font-size:.9rem}

/* CONTROLS + CHARTS */
.controls{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:18px}
.seg{display:inline-flex;background:#fff;border:1px solid var(--line);border-radius:10px;padding:4px;flex-wrap:wrap}
.seg button{border:none;background:none;padding:8px 13px;border-radius:7px;font-weight:600;font-size:.85rem;color:var(--muted);cursor:pointer;font-family:inherit}
.seg button.on{background:var(--accent);color:#fff}
.chart-box{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px;box-shadow:var(--shadow);position:relative;height:380px}
.chart-box.sm{height:300px}
.chart-box h4{text-align:center;margin-bottom:8px;color:var(--ink2);font-weight:600}
.xai-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.xai-grid .chart-box:last-child{grid-column:1 / -1}
/* XAI enhanced */
.xai-methods{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:6px}
.xm{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px}
.xm .ic{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:10px;background:#eef3fe;color:var(--accent);margin-bottom:12px}
.xm .ic svg{width:21px;height:21px}
.xm b{display:block;margin-bottom:6px;color:var(--ink)}
.xm p{color:var(--muted);font-size:.9rem}
.xai-duo{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.xai-trust{display:grid;grid-template-columns:1.6fr 1fr;gap:18px;align-items:stretch}
.tcard{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px;box-shadow:var(--shadow);display:flex;flex-direction:column;justify-content:center}
.tc-h{font-weight:600;color:var(--ink2);margin-bottom:16px}
.tbar{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.tbar label{width:84px;color:var(--muted);font-size:.86rem}
.tbar .bar{flex:1;height:10px;background:#eef1f6;border-radius:6px;overflow:hidden}
.tbar .bar i{display:block;height:100%;background:var(--accent);border-radius:6px}
.tbar b{width:48px;text-align:right;color:var(--ink);font-size:.9rem}
.tcard p{color:var(--muted);font-size:.86rem;margin-top:6px}

/* SLIDER */
.slider{position:relative;max-width:720px;margin:10px auto 0;border-radius:12px;overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow);user-select:none;cursor:ew-resize;background:#000;aspect-ratio:16/9}
.slider img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;pointer-events:none}
.s-top{clip-path:inset(0 50% 0 0)}
.s-handle{position:absolute;top:0;bottom:0;left:50%;width:2px;background:#fff;transform:translateX(-50%)}
.s-handle span{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background:#fff;color:var(--navy);border-radius:50%;width:36px;height:36px;display:grid;place-items:center;font-size:.9rem;font-weight:700;box-shadow:0 4px 14px rgba(0,0,0,.4)}
.s-label{position:absolute;bottom:12px;background:rgba(15,36,64,.72);color:#fff;font-size:.76rem;padding:4px 10px;border-radius:7px}
.s-l{left:12px}.s-r{right:12px}
.thumbs{display:flex;gap:12px;justify-content:center;margin:18px 0 0;flex-wrap:wrap}
.thumbs img{width:118px;height:70px;object-fit:cover;border-radius:9px;border:2px solid var(--line);cursor:pointer;transition:border-color .2s,transform .2s}
.thumbs img:hover{transform:translateY(-2px)}
.thumbs img.on{border-color:var(--accent)}

/* COLLAPSIBLE TABLE */
.collapsible{margin-top:30px;border:1px solid var(--line);border-radius:12px;background:#fff;overflow:hidden}
.collapsible summary{cursor:pointer;list-style:none;padding:16px 22px;font-weight:600;color:var(--ink);display:flex;align-items:center;gap:12px;user-select:none}
.collapsible summary::-webkit-details-marker{display:none}
.chev{width:9px;height:9px;border-right:2px solid var(--accent);border-bottom:2px solid var(--accent);transform:rotate(-45deg);transition:transform .25s;flex:none}
.collapsible[open] .chev{transform:rotate(45deg)}
.collapsible summary:hover{background:var(--bg2)}
.table-wrap{padding:0 22px 6px;overflow-x:auto}
table.res{width:100%;border-collapse:collapse;font-size:.88rem;min-width:640px}
table.res th,table.res td{padding:9px 12px;text-align:right;border-bottom:1px solid var(--line)}
table.res th:first-child,table.res td:first-child{text-align:left}
table.res thead th{color:var(--muted);font-weight:600;border-bottom:2px solid var(--line)}
table.res tr.ds td{background:var(--bg2);font-weight:700;color:var(--ink);text-align:left}
table.res td.best{color:var(--accent);font-weight:700}
table.res tr.ours td:first-child{font-weight:700}
.collapsible .note{padding:0 22px 18px;margin-top:4px}

/* FINDINGS */
.findings{counter-reset:f;list-style:none;display:grid;gap:14px;max-width:900px}
.findings li{counter-increment:f;position:relative;background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px 22px 20px 64px;color:var(--ink2)}
.findings li::before{content:counter(f);position:absolute;left:18px;top:18px;width:32px;height:32px;border-radius:9px;background:var(--accent);color:#fff;font-weight:700;display:grid;place-items:center}
.findings li b{color:var(--ink)}

/* METRICS */
.metrics{display:grid;grid-template-columns:repeat(auto-fit,minmax(188px,1fr));gap:16px}
.m{background:#fff;border:1px solid var(--line);border-radius:13px;padding:24px;text-align:center}
.m b{display:block;font-size:2rem;font-weight:800;color:var(--accent)}
.m span{color:var(--muted);font-size:.87rem}

/* BIB */
.bib{position:relative;background:var(--navy);border-radius:12px;padding:24px;overflow:auto}
.bib pre{color:#cfdcf2;font-family:ui-monospace,Menlo,monospace;font-size:.83rem;white-space:pre-wrap;line-height:1.7}
#copyBib{position:absolute;top:14px;right:14px;background:rgba(255,255,255,.12);color:#fff;border:1px solid rgba(255,255,255,.2);border-radius:7px;padding:5px 13px;cursor:pointer;font-family:inherit;font-size:.82rem}
#copyBib:hover{background:rgba(255,255,255,.2)}

/* FOOTER */
footer{background:#0b1c33;color:#aec3e0;padding:44px 0;text-align:center}
footer .f-title{color:#fff;font-weight:600}
footer a{color:#8fb0e0}
footer .small{color:#5f7ea6;font-size:.84rem;margin-top:10px}

/* REVEAL */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

@media(max-width:820px){
  .nav-links{display:none}
  .nav-links.open{display:flex;position:absolute;top:55px;left:0;right:0;background:#fff;flex-direction:column;align-items:flex-start;padding:16px 24px;border-bottom:1px solid var(--line);gap:16px;box-shadow:var(--shadow)}
  #burger{display:block}
  .xai-grid{grid-template-columns:1fr}.xai-grid .chart-box:last-child{grid-column:auto}
  .xai-methods{grid-template-columns:1fr}
  .xai-duo{grid-template-columns:1fr}
  .xai-trust{grid-template-columns:1fr}
  .sec{padding:60px 0}
  .hero{padding:74px 22px 60px}
  .chart-box{height:340px;padding:16px}
  .chart-box.sm{height:290px}
  .cards{grid-template-columns:1fr 1fr}
}
@media(max-width:560px){
  .wrap{padding:0 18px}
  .nav-inner{padding:11px 18px}
  .hero{padding:58px 18px 50px}
  .tag{font-size:.66rem;padding:5px 11px;margin-bottom:22px;line-height:1.5}
  .hero h1{font-size:1.85rem;line-height:1.18}
  .authors{gap:12px;font-size:.95rem;margin-top:22px}
  .hero-btns{gap:10px;margin-top:26px}
  .hero-btns .btn{padding:10px 15px;font-size:.88rem}
  .stat-row{display:grid;grid-template-columns:1fr 1fr;gap:22px 14px;margin-top:34px}
  .stat b{font-size:1.75rem}
  .sec{padding:52px 0}
  .sec h2{font-size:1.4rem;gap:10px}
  .sec h2 .num{font-size:.74rem}
  .sec h3{font-size:1.1rem}
  .lead{font-size:1rem;margin-bottom:24px}
  .cards{grid-template-columns:1fr}
  .card,.stage,.m,.xm,.tcard{padding:18px}
  .chart-box{height:300px;padding:13px}
  .chart-box.sm{height:260px}
  .controls{gap:10px}
  .seg button{padding:7px 11px;font-size:.8rem}
  .thumbs img{width:90px;height:54px}
  .metrics{grid-template-columns:1fr 1fr}
  .m b{font-size:1.65rem}
  .findings li{padding:18px 18px 18px 56px}
  .findings li::before{left:14px;top:16px;width:28px;height:28px;font-size:.85rem}
  .collapsible summary{padding:14px 16px;font-size:.92rem}
  .table-wrap{padding:0 14px 6px}
  .bib pre{font-size:.76rem}
  .fig figcaption{font-size:.84rem}
}