:root{
  --tum:#0a4e6e;          /* MathWorks deep blue */
  --tum-bright:#0076a8;   /* MathWorks blue (primary accent) */
  --tum-cyan:#d97757;     /* Claude coral / MATLAB warm (gradient + warm accent) */
  --coral:#d97757;--coral-dark:#b85c37;
  --ink:#20201c;          /* warm near-black (Claude) */
  --muted:#6b6558;        /* warm gray */
  --line:#e7e2d6;         /* warm border */
  --bg:#faf9f5;           /* Claude warm paper */
  --bg-soft:#f1eee6;      /* warm card background */
  --radius:14px;--maxw:1120px;--shadow:0 1px 2px rgba(32,32,28,.05),0 8px 24px rgba(32,32,28,.07);
}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font-family:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--tum-bright);text-decoration:none}a:hover{text-decoration:underline}
img{max-width:100%;height:auto}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
/* header/nav */
header.site{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:14px;min-height:64px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--ink);letter-spacing:-.02em}
.brand:hover{text-decoration:none}
.brand .logo{width:34px;height:34px;border-radius:9px;flex:none;background:linear-gradient(135deg,var(--tum-bright),var(--tum));display:grid;place-items:center;color:#fff;font-weight:800;font-size:15px}
.brand small{display:block;font-weight:500;color:var(--muted);font-size:11px;letter-spacing:0}
.nav-links{margin-left:auto;display:flex;gap:2px;align-items:center;flex-wrap:wrap}
.nav-links a{color:var(--ink);font-weight:500;font-size:13.5px;padding:7px 10px;border-radius:8px;white-space:nowrap}
.nav-links a:hover{background:var(--bg-soft);text-decoration:none}
.nav-links a.active{color:var(--tum-bright);background:#e6eef2}
.menu-btn{margin-left:auto;display:none;background:none;border:1px solid var(--line);border-radius:8px;padding:8px 10px;font-size:16px;cursor:pointer}
/* hero */
.hero{background:radial-gradient(1100px 480px at 82% -10%,rgba(217,119,87,.20),transparent 60%),radial-gradient(900px 420px at 0% 8%,rgba(0,118,168,.14),transparent 55%),var(--bg-soft);border-bottom:1px solid var(--line)}
.hero-inner{padding:76px 0 64px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--coral-dark);background:#f7e9e1;border:1px solid #eed3c5;padding:6px 12px;border-radius:999px}
.hero h1{font-size:clamp(32px,5vw,54px);line-height:1.08;letter-spacing:-.03em;margin:20px 0 8px;font-weight:800}
.hero h1 .grad{background:linear-gradient(90deg,var(--tum-bright),var(--tum-cyan));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lede{font-size:clamp(17px,2vw,20px);color:var(--muted);max-width:720px}
.hero .sub{font-size:14px;color:var(--muted);margin-top:6px;font-weight:500}
.btns{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 22px;border-radius:10px;font-weight:600;font-size:15px;border:1px solid transparent;cursor:pointer}
.btn-primary{background:var(--coral);color:#fff}.btn-primary:hover{background:var(--coral-dark);text-decoration:none}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}.btn-ghost:hover{border-color:var(--tum-bright);color:var(--tum);text-decoration:none}
.badges{display:flex;flex-wrap:wrap;gap:18px;margin-top:34px;align-items:center;color:var(--muted);font-size:13px}
.badges b{color:var(--ink)}
/* sections */
section{padding:64px 0}
.section-head{max-width:720px;margin-bottom:36px}
.section-head h2{font-size:clamp(24px,3vw,34px);letter-spacing:-.02em;margin:0 0 10px;font-weight:800}
.section-head p{color:var(--muted);margin:0;font-size:17px}
.kicker{color:var(--tum-bright);font-weight:700;font-size:13px;text-transform:uppercase;letter-spacing:.08em}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .18s ease,box-shadow .18s ease}
.card:hover{transform:translateY(-3px);box-shadow:0 12px 32px rgba(16,24,40,.12)}
.card .thumb{position:relative;display:block;aspect-ratio:16/10;background:#0b1b33;overflow:hidden;cursor:pointer;border:0;padding:0;width:100%}
.card .thumb img{width:100%;height:100%;object-fit:cover}
.card .thumb video.inline-video{width:100%;height:100%;object-fit:cover;display:block;background:#0b1b33}
.card .play{position:absolute;inset:0;display:grid;place-items:center;color:#fff;background:linear-gradient(0deg,rgba(11,27,51,.35),rgba(11,27,51,0))}
.card .play span{width:54px;height:54px;border-radius:50%;background:rgba(255,255,255,.92);color:var(--tum);display:grid;place-items:center;font-size:20px;padding-left:4px;box-shadow:0 6px 18px rgba(0,0,0,.25)}
.card .body{padding:16px 18px}.card .body h3{margin:0 0 4px;font-size:16px}.card .body p{margin:0 0 8px;color:var(--muted);font-size:14px}
.card .body a.dl{font-size:12.5px;color:var(--muted);font-weight:500}
.card .thumb:hover .play span{transform:scale(1.08)}
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.feat{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.feat .ic{width:40px;height:40px;border-radius:10px;background:#e6eef2;color:var(--tum-bright);display:grid;place-items:center;font-size:20px;margin-bottom:14px}
.feat h3{margin:0 0 6px;font-size:17px}.feat p{margin:0;color:var(--muted);font-size:14.5px}
.split{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.split .prose p{color:var(--muted);font-size:16px}.split .prose h2{font-size:clamp(24px,3vw,32px);letter-spacing:-.02em;margin:0 0 14px}
.code{background:#0b1b33;color:#e6edf6;border-radius:var(--radius);padding:22px;font-family:'JetBrains Mono',monospace;font-size:13.5px;line-height:1.7;box-shadow:var(--shadow);overflow:auto}
.code .c{color:#7fd1ff}.code .k{color:#ffd479}.code .m{color:#8b97a8}
.band{background:linear-gradient(135deg,var(--tum),#0a2a52);color:#fff;border-radius:20px;padding:44px;text-align:center}
.band h2{font-size:clamp(24px,3vw,32px);margin:0 0 10px;letter-spacing:-.02em}
.band p{color:#cfe0f2;margin:0 auto 24px;max-width:620px}
.band .btn-primary{background:#fff;color:var(--tum)}.band .btn-primary:hover{background:#eef4f7}
.band .btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.4)}.band .btn-ghost:hover{border-color:#fff;color:#fff}
/* inner content page */
.page{padding:52px 0 64px}
.page .pagehead{border-bottom:1px solid var(--line);padding-bottom:20px;margin-bottom:28px}
.page .pagehead .kicker{margin-bottom:6px;display:block}
.page h1{font-size:clamp(26px,4vw,40px);letter-spacing:-.02em;margin:0}
.prose{font-size:16px;color:#25303f}
.prose h2{font-size:24px;letter-spacing:-.01em;margin:32px 0 12px}
.prose h3{font-size:19px;margin:24px 0 10px}
.prose p{margin:0 0 14px}
.prose ul,.prose ol{margin:0 0 16px;padding-left:22px}.prose li{margin:4px 0}
.prose img{border-radius:10px;border:1px solid var(--line);margin:6px 8px 6px 0}
.prose pre{background:#0b1b33;color:#e6edf6;border-radius:12px;padding:18px;overflow:auto;font-size:13px;line-height:1.6}
.prose code{font-family:'JetBrains Mono',monospace;background:var(--bg-soft);padding:1px 5px;border-radius:5px;font-size:.92em}
.prose pre code{background:none;padding:0}
.prose blockquote{border-left:3px solid var(--tum-bright);margin:14px 0;padding:2px 16px;color:var(--muted);background:var(--bg-soft);border-radius:0 8px 8px 0}
.gallery{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0}
.gallery img{max-height:150px;width:auto;border-radius:10px;border:1px solid var(--line)}
/* footer */
footer.site{border-top:1px solid var(--line);background:var(--bg-soft);padding:40px 0;margin-top:20px}
.foot{display:flex;flex-wrap:wrap;gap:24px;justify-content:space-between;align-items:center;color:var(--muted);font-size:14px}
.foot a{color:var(--muted)}
@media(max-width:1024px){.nav-links a{font-size:12.5px;padding:6px 8px}}
@media(max-width:900px){.cards,.features{grid-template-columns:1fr 1fr}.split{grid-template-columns:1fr;gap:28px}}
@media(max-width:760px){.nav-links{display:none;width:100%;flex-direction:column;align-items:stretch;padding:8px 0}.nav-links.open{display:flex}.menu-btn{display:inline-block}}
@media(max-width:640px){.cards,.features{grid-template-columns:1fr}.hero-inner{padding:52px 0 44px}}
.mstones{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:26px}
.mstone{display:block;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);transition:transform .16s,box-shadow .16s}
.mstone:hover{transform:translateY(-3px);box-shadow:0 12px 30px rgba(32,32,28,.12);text-decoration:none}
.mstone .mdate{font-size:12px;font-weight:700;letter-spacing:.06em;color:var(--tum-bright);text-transform:uppercase}
.mstone h3{margin:6px 0 8px;font-size:17px;color:var(--ink);line-height:1.3}
.mstone p{margin:0 0 12px;color:var(--muted);font-size:14px}
.mstone .more{font-size:13px;font-weight:600;color:var(--coral-dark)}
@media(max-width:760px){.mstones{grid-template-columns:1fr}}
.langsw{display:inline-flex;gap:2px;margin-left:8px;padding-left:10px;border-left:1px solid var(--line)}
.langsw a{font-size:12.5px;font-weight:700;color:var(--muted);padding:6px 8px;border-radius:7px;letter-spacing:.03em}
.langsw a:hover{background:var(--bg-soft);text-decoration:none}
.langsw a.cur{color:var(--tum-bright);background:#e6eef2}
.mshero{width:100%;max-width:760px;border:1px solid var(--line);border-radius:12px;margin:4px 0 22px;display:block}
.mstone .mthumb{aspect-ratio:16/10;background:#0b1b33;border-radius:10px;overflow:hidden;margin-bottom:14px}
.mstone .mthumb img{width:100%;height:100%;object-fit:cover;display:block}
.slead{font-size:16px;color:#25303f;margin:0 0 14px}
.sintro{background:var(--bg-soft);border:1px solid var(--line);border-radius:12px;padding:16px 20px;margin:0 0 24px;font-size:14.5px;color:#25303f}
.sintro p{margin:0 0 10px}.sintro p:last-child{margin:0}
.stree{margin-top:8px}
details.snode{border:1px solid var(--line);border-radius:10px;margin:8px 0;background:#fff}
details.snode>summary{cursor:pointer;list-style:none;padding:11px 14px;font-weight:700;color:var(--ink);font-size:15px;display:flex;align-items:center;gap:8px;border-radius:10px}
details.snode>summary::-webkit-details-marker{display:none}
details.snode>summary::before{content:"▸";color:var(--tum-bright);font-size:12px;transition:transform .15s}
details.snode[open]>summary::before{transform:rotate(90deg)}
details.snode>summary:hover{background:var(--bg-soft)}
.snode-l1>summary{font-size:16.5px;color:var(--tum)}
.snode .sbody{padding:2px 16px 12px 30px}
.snode .sbody p{margin:6px 0;font-size:14px;color:#38424f}
.scount{margin-left:auto;font-size:11.5px;font-weight:700;color:var(--tum-bright);background:#e6eef2;border-radius:999px;padding:1px 9px}
.schapimg{max-width:360px;width:100%;border:1px solid var(--line);border-radius:10px;margin:6px 0 10px}
details.sfuncs{margin:8px 0 4px}
details.sfuncs>summary{cursor:pointer;font-size:12.5px;font-weight:600;color:var(--coral-dark);list-style:none}
details.sfuncs>summary::-webkit-details-marker{display:none}
details.sfuncs>summary::before{content:"⋯ ";color:var(--coral)}
.sfunclist{font-family:'JetBrains Mono',monospace;font-size:12px;color:var(--muted);background:var(--bg-soft);border-radius:8px;padding:10px 12px;margin-top:6px;line-height:1.7;word-break:break-word}
/* ---- Structure tile navigator ---- */
.structpage.page{padding:28px 0 24px}
.structapp{margin-top:6px}
.stbar{display:flex;align-items:center;flex-wrap:wrap;gap:6px;margin-bottom:12px;font-size:14px}
.stbar .crumb{color:var(--tum-bright);font-weight:600}
.stbar a.crumb{cursor:pointer}.stbar a.crumb:hover{text-decoration:underline}
.stbar .crumb.cur{color:var(--ink);font-weight:700}
.stbar .sep{color:var(--muted)}
.stbar .stback{margin-left:auto;border:1px solid var(--line);background:#fff;border-radius:8px;padding:6px 12px;font-size:13px;font-weight:600;cursor:pointer;color:var(--ink)}
.stbar .stback:hover{border-color:var(--tum-bright);color:var(--tum)}
.stlead{color:var(--muted);font-size:14.5px;margin:0 0 12px}
.stgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;grid-auto-rows:clamp(170px,calc((100vh - 265px)/3),250px);align-content:start}
.sttile{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:14px;overflow:hidden;cursor:pointer;padding:0;text-align:left;background:#fff;box-shadow:var(--shadow);transition:transform .15s,box-shadow .15s;min-height:0}
.sttile:hover{transform:translateY(-3px);box-shadow:0 14px 34px rgba(32,32,28,.18)}
.sttile .imgwrap{position:relative;flex:1 1 auto;min-height:0;display:flex;align-items:center;justify-content:center;background:var(--bg-soft);padding:6px}
.sttile .imgwrap img{max-width:100%;max-height:100%;width:auto;height:auto;object-fit:contain;display:block}
.sttile.noimg .imgwrap{background:linear-gradient(135deg,var(--tum-bright),var(--tum));color:#fff}
.sttile.noimg .imgwrap .phnum{font-size:clamp(26px,4vw,40px);font-weight:800;opacity:.92}
.sttile .kids{position:absolute;top:10px;right:10px;background:rgba(255,255,255,.94);color:var(--tum);font-size:11.5px;font-weight:800;border-radius:999px;padding:2px 9px;box-shadow:0 2px 6px rgba(0,0,0,.15)}
.sttile .ov{flex:0 0 auto;display:block;padding:9px 12px 11px;border-top:1px solid var(--line);background:#fff}
.sttile .ov .num{display:block;font-size:11px;font-weight:800;letter-spacing:.04em;color:var(--tum-bright)}
.sttile .ov .ti{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;font-size:14.5px;font-weight:800;line-height:1.18;letter-spacing:-.01em;color:var(--ink);word-break:break-word;margin-top:1px}
.sttile .ov .tx{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;font-size:11.5px;line-height:1.3;color:var(--muted);margin-top:3px}
.stdetail{display:grid;grid-template-columns:minmax(0,420px) 1fr;gap:26px;height:calc(100vh - 230px);min-height:420px;overflow:auto}
.stdetail .dimg{width:100%;border:1px solid var(--line);border-radius:12px;object-fit:contain;background:var(--bg-soft);align-self:start}
.stdetail .dnum{font-size:12px;font-weight:800;color:var(--tum-bright);letter-spacing:.06em}
.stdetail h2{margin:4px 0 12px;font-size:26px;letter-spacing:-.02em}
.stdetail .dtext p{color:#38424f;font-size:15px;margin:0 0 12px}
.stdetail .dfuncs{margin-top:14px;font-size:13px;color:var(--muted)}
.stdetail .dflist{font-family:'JetBrains Mono',monospace;font-size:12px;background:var(--bg-soft);border-radius:8px;padding:10px 12px;margin-top:6px;line-height:1.7;word-break:break-word}
@media(max-width:760px){.stgrid{grid-template-columns:repeat(2,1fr)}.stdetail{grid-template-columns:1fr;height:auto}}
/* homepage 'please note' banner */
.noticebar{background:#fbf1ea;border-top:1px solid #eed3c5;border-bottom:1px solid #eed3c5}
.noticebar .notice{padding:20px 0}
.noticebar .ntag{display:inline-block;font-size:11.5px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:#fff;background:var(--coral);border-radius:999px;padding:3px 12px;margin-bottom:10px}
.noticebar .notice p{margin:0 0 8px;color:#4a3b33;font-size:14.5px;line-height:1.55;max-width:900px}
.noticebar .notice p:last-child{margin:0;color:#6b6558;font-size:13.5px}
/* Documentation hub */
.doclist{display:flex;flex-direction:column;gap:8px;margin:6px 0 26px}
.docrow{display:block;border:1px solid var(--line);border-radius:10px;padding:11px 16px;background:#fff}
.docrow:hover{border-color:var(--tum-bright);text-decoration:none;background:var(--bg-soft)}
.docrow b{color:var(--ink);font-size:15px}
.docrow span{display:block;color:var(--muted);font-size:13.5px;margin-top:2px}
.doccards{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin:6px 0 8px}
.doccard{display:block;border:1px solid var(--line);border-radius:12px;padding:16px 18px;background:var(--bg-soft);transition:transform .15s,border-color .15s}
.doccard:hover{border-color:var(--tum-bright);text-decoration:none;transform:translateY(-2px)}
.doccard .dch{display:block;font-weight:800;color:var(--tum);font-size:15.5px}
.doccard .dcd{display:block;color:var(--muted);font-size:13.5px;margin-top:4px;line-height:1.4}
@media(max-width:640px){.doccards{grid-template-columns:1fr}}
/* Tutorials — grouped, collapsible */
.tutgroups{margin-top:8px}
details.tutgroup{border:1px solid var(--line);border-radius:10px;margin:8px 0;background:#fff}
details.tutgroup>summary{cursor:pointer;list-style:none;padding:12px 16px;font-weight:800;color:var(--tum);font-size:15.5px;display:flex;align-items:center;gap:8px}
details.tutgroup>summary::-webkit-details-marker{display:none}
details.tutgroup>summary::before{content:"▸";color:var(--tum-bright);font-size:12px;transition:transform .15s}
details.tutgroup[open]>summary::before{transform:rotate(90deg)}
details.tutgroup>summary:hover{background:var(--bg-soft)}
.tutgroup .tgn{margin-left:auto;font-size:11.5px;font-weight:700;color:var(--tum-bright);background:#e6eef2;border-radius:999px;padding:1px 9px}
.tutlist{padding:2px 14px 12px}
.tutrow{display:flex;gap:12px;align-items:baseline;padding:8px;border-radius:8px;border-top:1px solid var(--line)}
.tutrow:hover{background:var(--bg-soft);text-decoration:none}
.tutrow .tn{font-family:'JetBrains Mono',monospace;font-size:12px;font-weight:700;color:var(--coral-dark);min-width:22px}
.tutrow .tt{color:var(--ink);font-size:14px;line-height:1.35}
.startbox{background:#f7e9e1;border:1px solid #eed3c5;border-radius:10px;padding:12px 16px;margin:0 0 18px;font-size:14.5px;color:#4a3b33}
.startbox a{font-weight:700;color:var(--coral-dark)}