/* R26-IT-142 research website
   Layout: classic single-page academic research site. Fixed white navbar, dark hero banner,
   then alternating white / pale-blue sections, each with a small blue section label and a navy heading. */
:root{
  --navy:#0d1b3e;      /* headings, hero (logo navy) */
  --blue:#2f63e8;      /* primary accent (logo blue) */
  --violet:#7b4ae2;    /* secondary, used sparingly */
  --text:#2c3550;
  --muted:#66708a;
  --line:#dde3ef;
  --bg:#ffffff;
  --bg-alt:#f3f6fc;
  --f-head:"Manrope","Segoe UI",system-ui,sans-serif;
  --f-body:"Source Sans 3","Segoe UI",system-ui,sans-serif;
  color-scheme:light;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:76px}
body{margin:0;background:var(--bg);color:var(--text);font:17px/1.65 var(--f-body)}
h1,h2,h3,h4{font-family:var(--f-head);color:var(--navy);margin:0;text-wrap:balance;line-height:1.2}
h2{font-size:clamp(1.7rem,3.2vw,2.2rem);font-weight:800}
h3{font-size:1.2rem;font-weight:700}
h4{font-size:1.02rem;font-weight:700}
p{margin:0}
a{color:var(--blue)}
:focus-visible{outline:2px solid var(--blue);outline-offset:3px}
.container{max-width:1140px;margin:0 auto;padding-inline:clamp(16px,4vw,32px)}
.label{display:block;font:700 .8rem/1 var(--f-head);letter-spacing:.14em;text-transform:uppercase;color:var(--blue);margin-bottom:10px}
.muted{color:var(--muted)}
.ph{color:#9aa3b8;font-style:italic}

/* ---------- navbar ---------- */
.nav{position:fixed;top:env(safe-area-inset-top,0px);left:0;right:0;z-index:50;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 2px 14px rgba(13,27,62,.06)}
.nav .container{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--navy);font:800 1.05rem/1.1 var(--f-head)}
.brand img{width:40px;height:40px;object-fit:contain}
.brand small{display:block;font:600 .7rem/1 var(--f-head);color:var(--muted);letter-spacing:.08em;margin-top:3px}
.menu{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0}
.menu>li{position:relative}
.menu>li>a,.menu>li>button{display:flex;align-items:center;gap:6px;padding:10px 14px;font:600 .93rem var(--f-head);color:var(--navy);text-decoration:none;background:none;border:0;cursor:pointer;border-bottom:2px solid transparent}
.menu>li>a:hover,.menu>li>button:hover,.menu>li.active>a{color:var(--blue);border-bottom-color:var(--blue)}
.caret{width:9px;height:9px}
.drop{position:absolute;top:100%;left:0;min-width:220px;background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:0 12px 30px rgba(13,27,62,.12);padding:6px;list-style:none;margin:0;opacity:0;visibility:hidden;transform:translateY(6px);transition:.15s}
.menu>li:hover .drop,.menu>li:focus-within .drop{opacity:1;visibility:visible;transform:none}
.drop a{display:block;padding:9px 12px;border-radius:6px;color:var(--text);text-decoration:none;font-size:.95rem}
.drop a:hover{background:var(--blue);color:#fff}
.burger{display:none;background:none;border:1px solid var(--line);border-radius:8px;padding:8px 10px;cursor:pointer}
@media (max-width:900px){
  .burger{display:block}
  .menu{position:absolute;top:68px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;padding:8px 16px 16px;border-bottom:1px solid var(--line);display:none}
  .menu.open{display:flex}
  .drop{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:0;padding:0 0 0 14px}
}

/* ---------- hero ---------- */
.hero{position:relative;margin-top:68px;background:var(--navy);color:#fff;overflow:hidden}
.hero canvas{position:absolute;inset:0;width:100%;height:100%;opacity:.55}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(13,27,62,.2),rgba(13,27,62,.85))}
.hero .container{position:relative;z-index:1;padding-block:clamp(80px,13vw,150px) clamp(64px,9vw,110px);text-align:center}
.hero .code{display:inline-block;font:700 .8rem/1 var(--f-head);letter-spacing:.16em;text-transform:uppercase;border:1px solid rgba(255,255,255,.35);padding:8px 14px;border-radius:999px;color:#d9e2ff}
.hero h1{color:#fff;font-size:clamp(2rem,4.6vw,3.3rem);font-weight:800;max-width:22ch;margin:22px auto 18px;text-shadow:0 2px 16px rgba(0,0,0,.3)}
.hero p{color:#c9d3ee;max-width:60ch;margin:0 auto;font-size:1.1rem}
.btn{display:inline-flex;align-items:center;gap:10px;padding:13px 30px;border-radius:6px;font:700 1rem var(--f-head);text-decoration:none;border:2px solid #fff;color:#fff;background:transparent;cursor:pointer;transition:.2s}
.btn:hover{background:var(--blue);border-color:var(--blue)}
.btn svg{transition:transform .2s}.btn:hover svg{transform:translateX(5px)}
.hero .btn{margin-top:34px}
.pillars{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;margin-top:64px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.14);border-radius:10px;overflow:hidden;text-align:left}
.pillars div{background:rgba(13,27,62,.75);padding:18px 20px;display:flex;gap:12px;align-items:center;font:600 .95rem/1.3 var(--f-head);color:#e8edfb}
.pillars svg{flex-shrink:0;color:#8fb0ff}
@media (max-width:760px){.pillars{grid-template-columns:1fr 1fr}}
@media (max-width:440px){.pillars{grid-template-columns:1fr}}

/* ---------- sections ---------- */
section{padding-block:clamp(64px,8vw,96px)}
section.alt{background:var(--bg-alt)}
.sub+.sub{margin-top:80px}
.sub>h2{margin-bottom:24px}
.two{display:grid;grid-template-columns:1.25fr 1fr;gap:40px;align-items:start}
.two>*{min-width:0}
@media (max-width:900px){.two{grid-template-columns:1fr}}
.prose p+p{margin-top:14px}
.prose p{text-align:justify;hyphens:auto}
.info{border:2px solid var(--blue);border-radius:14px;padding:24px;background:#fff}
.info h3{margin-bottom:14px}
.info ul{margin:0;padding-left:20px;display:grid;gap:8px}
.refs{margin-top:22px;font-size:.88rem;color:var(--muted)}
.refs b{color:var(--navy);font-family:var(--f-head)}
.refs ol{margin:6px 0 0;padding-left:20px}

.cards{display:grid;gap:20px}
.c3{grid-template-columns:repeat(3,1fr)}
.c4{grid-template-columns:repeat(4,1fr)}
.c2{grid-template-columns:repeat(2,1fr)}
@media (max-width:980px){.c4{grid-template-columns:repeat(2,1fr)}.c3{grid-template-columns:repeat(2,1fr)}}
@media (max-width:620px){.c4,.c3,.c2{grid-template-columns:1fr}}
.card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:24px;min-width:0;transition:.2s}
.card:hover{box-shadow:0 12px 28px -14px rgba(13,27,62,.25);transform:translateY(-2px)}
.card p{color:var(--muted);font-size:.98rem;margin-top:8px}
.icon{width:46px;height:46px;border-radius:10px;background:#e8eefc;color:var(--blue);display:grid;place-items:center;margin-bottom:16px}

table{width:100%;border-collapse:collapse;background:#fff;border-radius:12px;overflow:hidden;border:1px solid var(--line);font-size:.98rem}
th,td{text-align:left;padding:14px 18px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:var(--navy);color:#fff;font:700 .85rem var(--f-head);letter-spacing:.04em}
td:first-child{color:var(--muted);width:50%}
tr:last-child td{border-bottom:0}
td .yes{color:#1c9a6c;font-weight:700;margin-right:6px}
.tablewrap{overflow-x:auto}

.ps .card h3{display:flex;align-items:center;gap:10px}
.ps .card.sol{border-color:var(--blue)}
.video{margin-top:28px;aspect-ratio:16/9;max-width:860px;margin-inline:auto;border-radius:12px;background:var(--navy);display:grid;place-items:center;text-align:center;color:#c9d3ee}
.video .play{width:72px;height:72px;border-radius:50%;background:var(--blue);display:grid;place-items:center;margin:0 auto 14px}
.caption{text-align:center;font-size:.88rem;color:var(--muted);margin-top:10px}

.mainobj{background:var(--navy);color:#e8edfb;border-radius:14px;padding:28px 32px;margin-bottom:28px;font-size:1.1rem}
.mainobj .label{color:#8fb0ff}
.obj .num{font:800 .78rem/1 var(--f-head);color:var(--blue);letter-spacing:.12em}
.obj h3{margin:8px 0 6px}
.obj ul{margin:12px 0 0;padding-left:18px;color:var(--muted);font-size:.95rem;display:grid;gap:4px}
.obj .tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:16px}
.tag{font:600 .74rem/1 var(--f-head);padding:6px 10px;border-radius:999px;background:var(--bg-alt);color:var(--navy);border:1px solid var(--line)}

/* architecture diagram */
.arch{background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px;overflow-x:auto}
.arch svg{display:block;min-width:820px;width:100%;height:auto}
.layers{display:grid;grid-template-columns:repeat(6,1fr);gap:12px;margin-top:20px;counter-reset:l}
.layers div{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px;font-size:.9rem;color:var(--muted)}
.layers b{display:block;font:700 .92rem var(--f-head);color:var(--navy);margin-bottom:4px}
@media (max-width:980px){.layers{grid-template-columns:repeat(3,1fr)}}
@media (max-width:560px){.layers{grid-template-columns:1fr 1fr}}

.tech{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px}
.tech>div{background:#fff;border:1px solid var(--line);border-radius:10px;padding:16px;display:flex;gap:14px;align-items:center;transition:.2s}
.tech>div:hover{box-shadow:0 10px 24px -14px rgba(13,27,62,.3);transform:translateY(-2px)}
.tech img{width:42px;height:42px;object-fit:contain;flex-shrink:0}
.tech b{display:block;line-height:1.25;font:700 1rem var(--f-head);color:var(--navy)}
.tech span span{font-size:.86rem;color:var(--muted);line-height:1.4;display:block;margin-top:4px}

/* timeline */
.timeline{list-style:none;margin:8px 0 0;padding:0;position:relative;max-width:820px}
.timeline::before{content:"";position:absolute;left:11px;top:6px;bottom:6px;width:2px;background:var(--navy)}
.tl{position:relative;padding:0 0 40px 52px}
.tl:last-child{padding-bottom:0}
.tl::before{content:"";position:absolute;left:4px;top:6px;width:16px;height:16px;background:var(--navy);transform:rotate(45deg);outline:6px solid var(--bg-alt);transition:.2s}
.tl:hover::before{background:var(--blue);transform:rotate(0)}
.tl .date{display:inline-block;background:var(--navy);color:#fff;font:600 .78rem/1 var(--f-head);padding:6px 12px;margin-bottom:10px;letter-spacing:.04em}
.tl h3{font-size:1.35rem}
.tl p{color:var(--muted);margin-top:6px}
.tl .marks{display:flex;align-items:center;gap:14px;margin-top:12px;font-size:.92rem}
.bar{flex:1;max-width:420px;height:10px;background:#dfe5f2;border-radius:5px;overflow:hidden;display:flex}
.bar i{display:block;height:100%;background:#9fb6ee}
.bar i.cur{background:var(--blue)}

/* downloads */
.dl{display:flex;flex-direction:column}
.dl .ftype{display:flex;align-items:center;gap:8px;font:700 .75rem var(--f-head);letter-spacing:.08em;color:var(--muted)}
.dl h3{margin-top:12px;font-size:1.08rem}
.dl p{flex:1}
.dl .get{margin-top:18px;display:inline-flex;align-items:center;gap:8px;font:700 .9rem var(--f-head);color:var(--blue);text-decoration:none}
.dl .get.soon{color:#9aa3b8}
.pdf{color:#d93a2b}.ppt{color:#d0562b}

/* team */
.person{text-align:center;padding:0;overflow:hidden}
.photo{aspect-ratio:4/3;background:linear-gradient(160deg,#e8eefc,#cfdaf6);display:grid;place-items:end center;color:#9fb2df}
.photo svg{width:46%;height:auto}
.person .body{padding:20px 18px 22px}
.person .role{font:700 .78rem/1.3 var(--f-head);letter-spacing:.08em;text-transform:uppercase;color:var(--blue);margin-top:6px}
.person .meta{font-size:.92rem;color:var(--muted);margin-top:8px;line-height:1.45}
.person .links{display:flex;justify-content:center;gap:10px;margin-top:14px}
.person .links a{width:36px;height:36px;border-radius:50%;border:1px solid var(--line);display:grid;place-items:center;color:var(--navy)}
.person .links a:hover{background:var(--blue);color:#fff;border-color:var(--blue)}
.sup{max-width:760px;margin-inline:auto}
.teamhead{text-align:center;margin:48px 0 20px;font:700 .82rem var(--f-head);letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}

/* contact */
.contact{display:grid;grid-template-columns:1.2fr 1fr;gap:32px}
@media (max-width:860px){.contact{grid-template-columns:1fr}}
form{display:grid;gap:16px}
label{display:grid;gap:6px;font:600 .9rem var(--f-head);color:var(--navy)}
input,textarea{font:400 1rem var(--f-body);padding:12px 14px;border:1px solid var(--line);border-radius:8px;width:100%;color:var(--text);background:#fff}
input:focus,textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(47,99,232,.15)}
textarea{min-height:140px;resize:vertical}
.submit{background:var(--blue);border-color:var(--blue);width:100%;justify-content:center}
.submit:hover{background:var(--navy);border-color:var(--navy)}
.ok{color:#1c9a6c;font-size:.92rem}
.cdetails{background:var(--navy);color:#c9d3ee;border-radius:14px;padding:30px}
.cdetails h3{color:#fff;margin-bottom:18px}
.cdetails div{display:flex;gap:12px;align-items:flex-start;padding-block:12px;border-top:1px solid rgba(255,255,255,.12)}
.cdetails div:first-of-type{border-top:0}
.cdetails b{display:block;color:#fff;font:700 .85rem var(--f-head)}
.cdetails svg{flex-shrink:0;color:#8fb0ff;margin-top:3px}

footer{background:var(--navy);color:#9eabcf;font-size:.9rem;padding-block:26px}
footer .container{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}

@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}html{scroll-behavior:auto}}
.video iframe{width:100%;height:100%;border:0;border-radius:12px}
.photo img{width:100%;height:100%;object-fit:cover;object-position:50% 25%}
.photo:has(img){place-items:stretch}
.dl .multi{display:grid;gap:2px;margin-top:14px}
.dl .multi .get{margin-top:6px}
.photo{position:relative;overflow:hidden}
.photo img{position:absolute;inset:0}