/* ==========================================================================
   akmaurya.com — Academic website stylesheet
   Design tokens first; then layout, components, responsive & motion.
   Change the tokens in :root to re-skin the whole site.
   ========================================================================== */
:root{
  /* Colour */
  --ink:#17212b;         /* primary text / headings */
  --ink-2:#3f4a55;       /* body text */
  --muted:#6b7681;       /* secondary text */
  --paper:#faf9f6;       /* page background */
  --surface:#ffffff;     /* cards */
  --panel:#f2f0e9;       /* subtle panels */
  --line:#e6e3da;        /* hairlines / borders */
  --teal:#0e5e6f;        /* primary accent */
  --teal-d:#0a4753;      /* darker accent (hover) */
  --teal-tint:#e6f0f1;   /* accent wash */
  --brass:#8a5e10;       /* secondary accent (text-safe) */
  --brass-tint:#f5edda;
  --ok:#2f7d4f;
  /* Type */
  --serif:'Newsreader',Georgia,'Times New Roman',serif;
  --sans:'IBM Plex Sans',system-ui,-apple-system,'Segoe UI',sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,'SFMono-Regular',monospace;
  /* Metrics */
  --nav-h:60px;
  --wrap:1180px;
  --radius:14px;
  --radius-s:9px;
  --shadow:0 1px 2px rgba(23,33,43,.04),0 6px 22px rgba(23,33,43,.06);
  --shadow-lg:0 10px 40px rgba(23,33,43,.12);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 8px);-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--paper);color:var(--ink-2);
  font-family:var(--sans);font-size:16px;line-height:1.6;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
h1,h2,h3,h4{font-family:var(--serif);color:var(--ink);line-height:1.15;margin:0;font-weight:600;letter-spacing:-.01em}
a{color:var(--teal);text-decoration:none;transition:color .18s}
a:hover{color:var(--teal-d)}
img{max-width:100%;display:block}
ul{margin:0;padding:0;list-style:none}
:focus-visible{outline:3px solid var(--teal);outline-offset:2px;border-radius:4px}
.skip-link{position:absolute;left:-999px;top:8px;background:var(--teal);color:#fff;padding:10px 16px;border-radius:8px;z-index:1000}
.skip-link:focus{left:12px}

.wrap{max-width:var(--wrap);margin-inline:auto;padding-inline:24px}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--teal);font-weight:600}
.muted{color:var(--muted)}
.chip{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:500;padding:4px 11px;border-radius:999px;background:var(--teal-tint);color:var(--teal-d);border:1px solid rgba(14,94,111,.15)}
.chip.amber{background:var(--brass-tint);color:var(--brass);border-color:rgba(138,94,16,.2)}
.chip.ok{background:#e7f3ec;color:var(--ok);border-color:rgba(47,125,79,.2)}

/* ---------- Navigation ---------- */
.nav{
  position:sticky;top:0;z-index:100;height:var(--nav-h);
  background:rgba(250,249,246,.82);backdrop-filter:saturate(180%) blur(12px);
  -webkit-backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--line);
}
.nav-inner{display:flex;align-items:center;height:100%;gap:18px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--serif);font-weight:600;color:var(--ink);font-size:18px;white-space:nowrap}
.brand .mono{font-family:var(--mono);font-size:11px;color:var(--muted);font-weight:500}
.brand-mark{width:30px;height:30px;flex:0 0 auto}
.nav-links{display:flex;gap:4px;margin-left:auto;align-items:center;flex-wrap:nowrap}
.nav-links a{font-size:14px;color:var(--ink-2);padding:7px 11px;border-radius:8px;font-weight:500;transition:background .16s,color .16s}
.nav-links a:hover{background:var(--panel);color:var(--ink)}
.nav-links a.active{color:var(--teal-d);background:var(--teal-tint)}
.nav-toggle{display:none;margin-left:auto;background:none;border:1px solid var(--line);border-radius:9px;padding:8px 10px;cursor:pointer;color:var(--ink)}

/* ---------- Hero (first screen) ---------- */
.hero{position:relative;padding:26px 0 34px;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:300px 1fr;gap:30px;align-items:start}
/* Left identity column */
.id-card{position:relative}
.portrait-wrap{position:relative;width:100%;max-width:280px}
.portrait{width:100%;aspect-ratio:1/1;object-fit:cover;border-radius:18px;border:1px solid var(--line);box-shadow:var(--shadow)}
.portrait-wrap::after{content:"";position:absolute;inset:auto -10px -10px auto;width:64%;height:64%;border-right:2px dashed rgba(14,94,111,.35);border-bottom:2px dashed rgba(14,94,111,.35);border-radius:0 0 18px 0;z-index:-1}
.id-links{display:flex;flex-wrap:wrap;gap:7px;margin-top:16px}
.id-links a{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:500;color:var(--ink-2);background:var(--surface);border:1px solid var(--line);padding:6px 10px;border-radius:8px}
.id-links a:hover{border-color:var(--teal);color:var(--teal-d);background:var(--teal-tint)}
.id-links svg{width:15px;height:15px}
.id-contact{margin-top:14px;font-size:13px;line-height:1.7}
.id-contact div{display:flex;gap:8px;align-items:flex-start}
.id-contact svg{width:15px;height:15px;color:var(--teal);flex:0 0 auto;margin-top:3px}

/* Right column */
.hero-name{font-size:clamp(30px,4.4vw,44px);margin:0 0 2px}
.hero-role{font-size:16px;color:var(--ink-2);font-weight:500}
.hero-role b{color:var(--teal-d);font-weight:600}
.hero-affil{font-size:14px;color:var(--muted);margin-top:2px}
.hero-tagline{font-family:var(--serif);font-style:italic;font-size:16px;color:var(--brass);margin:12px 0 12px;border-left:3px solid var(--brass);padding-left:12px}
.hero-summary{font-size:14.5px;margin:0 0 14px;max-width:66ch}
.area-tags{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:16px}

.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:0 0 16px}
.metric{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-s);padding:11px 12px;text-align:left}
.metric .v{font-family:var(--serif);font-size:23px;font-weight:600;color:var(--teal-d);line-height:1}
.metric .l{font-size:11.5px;color:var(--ink-2);font-weight:600;margin-top:5px}
.metric .n{font-size:10.5px;color:var(--muted)}

.hero-cols{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.mini{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px 15px}
.mini h3{font-size:13px;font-family:var(--sans);text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-bottom:9px;display:flex;align-items:center;gap:7px;font-weight:700}
.mini h3 a{margin-left:auto;font-size:11px;font-family:var(--mono);text-transform:none;letter-spacing:0}
.mini li{font-size:12.7px;line-height:1.45;padding:7px 0;border-top:1px solid var(--line)}
.mini li:first-child{border-top:none;padding-top:0}
.mini .yr{font-family:var(--mono);font-size:10.5px;color:var(--brass);font-weight:600}

.recruit{margin-top:14px;background:linear-gradient(100deg,var(--teal) 0%,var(--teal-d) 100%);color:#fff;border-radius:var(--radius);padding:14px 18px;display:flex;align-items:center;gap:16px;box-shadow:var(--shadow)}
.recruit .pulse{width:10px;height:10px;border-radius:50%;background:#fff;flex:0 0 auto;box-shadow:0 0 0 0 rgba(255,255,255,.7);animation:pulse 2.4s infinite}
.recruit .rt{flex:1;min-width:0}
.recruit strong{display:block;font-family:var(--serif);font-size:15px}
.recruit span{font-size:13px;color:rgba(255,255,255,.9)}
.recruit a{flex:0 0 auto;background:#fff;color:var(--teal-d);font-weight:600;font-size:13px;padding:8px 14px;border-radius:8px}
.recruit a:hover{background:var(--brass-tint)}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(255,255,255,.6)}70%{box-shadow:0 0 0 12px rgba(255,255,255,0)}100%{box-shadow:0 0 0 0 rgba(255,255,255,0)}}

/* subtle animated lane-line background band in hero */
.lanes{position:absolute;inset:0;z-index:-2;pointer-events:none;opacity:.5;
  background-image:repeating-linear-gradient(90deg,transparent 0 46px,rgba(14,94,111,.05) 46px 78px);
  mask-image:linear-gradient(180deg,transparent,#000 40%,transparent);}

/* ---------- Sections ---------- */
section{padding:52px 0;scroll-margin-top:var(--nav-h)}
section:nth-of-type(even){background:linear-gradient(180deg,#fff,#fdfcf9)}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:26px;flex-wrap:wrap}
.sec-head h2{font-size:clamp(24px,3vw,32px)}
.sec-head .sub{font-size:14px;color:var(--muted);margin-top:4px}
.sec-head .count{font-family:var(--mono);font-size:12px;color:var(--teal);background:var(--teal-tint);padding:4px 10px;border-radius:999px}

.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px;box-shadow:var(--shadow)}
.card h3{font-size:18px;margin-bottom:12px}

/* About */
.about-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:24px}
.bio p{margin:0 0 14px;font-size:15px}
.interests{display:flex;flex-wrap:wrap;gap:8px}
.timeline li{position:relative;padding:0 0 16px 22px;border-left:2px solid var(--line);margin-left:5px}
.timeline li::before{content:"";position:absolute;left:-7px;top:3px;width:12px;height:12px;border-radius:50%;background:var(--teal);border:2px solid var(--paper)}
.timeline li:last-child{border-left-color:transparent}
.timeline .t{font-weight:600;color:var(--ink);font-size:14.5px}
.timeline .m{font-size:13px;color:var(--muted)}
.timeline .y{font-family:var(--mono);font-size:11px;color:var(--brass);font-weight:600}

/* Publications */
.pub-tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px}
.pub-tab{font-family:var(--sans);font-size:13px;font-weight:600;padding:8px 14px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--ink-2);cursor:pointer;transition:.16s}
.pub-tab:hover{border-color:var(--teal)}
.pub-tab.active{background:var(--teal);color:#fff;border-color:var(--teal)}
.pub-tab .n{font-family:var(--mono);opacity:.7;margin-left:5px;font-size:11px}
.pub-list{display:grid;gap:2px}
.pub{display:grid;grid-template-columns:52px 1fr;gap:14px;padding:13px 4px;border-bottom:1px solid var(--line);align-items:baseline}
.pub .yr{font-family:var(--mono);font-size:13px;font-weight:600;color:var(--brass)}
.pub .c{font-size:14px;line-height:1.55;color:var(--ink-2)}
.pub .c a{font-family:var(--mono);font-size:11.5px;margin-left:6px;white-space:nowrap}
.pub-group-label{font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:22px 0 6px;font-weight:600}

/* Projects */
.proj{border-left:3px solid var(--teal);background:var(--surface);border:1px solid var(--line);border-left-width:3px;border-radius:var(--radius-s);padding:15px 17px}
.proj.ongoing{border-left-color:var(--brass);background:linear-gradient(100deg,var(--brass-tint) 0%,#fff 60%)}
.proj .top{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:7px}
.proj h3{font-size:15.5px;font-family:var(--sans);font-weight:600;color:var(--ink);line-height:1.35}
.proj .meta{font-size:12.5px;color:var(--muted);display:flex;gap:10px;flex-wrap:wrap;margin-top:8px}
.proj .meta b{color:var(--teal-d);font-weight:600}

/* Students */
.stu-summary{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:26px}
.stu-summary .metric .v{font-size:30px}
.stu{padding:13px 0;border-bottom:1px solid var(--line);display:grid;grid-template-columns:1fr auto;gap:12px;align-items:baseline}
.stu .nm{font-weight:600;color:var(--ink);font-size:14.5px}
.stu .th{font-size:13.3px;color:var(--ink-2);margin-top:2px}
.stu .badge{font-family:var(--mono);font-size:11px;font-weight:600;color:var(--brass);white-space:nowrap}
.subhead{font-family:var(--serif);font-size:19px;color:var(--ink);margin:6px 0 10px}

/* Awards / lists */
.awards li,.plist li{display:grid;grid-template-columns:120px 1fr;gap:14px;padding:11px 0;border-bottom:1px solid var(--line);font-size:14px}
.awards .y{font-family:var(--mono);font-size:12px;font-weight:600;color:var(--brass)}
.tags-wrap{display:flex;flex-wrap:wrap;gap:8px}
.tags-wrap .chip{background:var(--surface);border:1px solid var(--line);color:var(--ink-2)}

/* Gallery */
.gallery-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.gal{position:relative;overflow:hidden;border-radius:var(--radius);border:1px solid var(--line);cursor:pointer;background:var(--panel);aspect-ratio:4/3}
.gal img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease}
.gal:hover img{transform:scale(1.06)}
.gal figcaption{position:absolute;left:0;right:0;bottom:0;padding:18px 12px 10px;font-size:12.5px;color:#fff;background:linear-gradient(transparent,rgba(0,0,0,.72));opacity:0;transform:translateY(6px);transition:.25s}
.gal:hover figcaption,.gal:focus-within figcaption{opacity:1;transform:none}
/* Lightbox */
.lightbox{position:fixed;inset:0;background:rgba(15,20,26,.92);z-index:1000;display:none;align-items:center;justify-content:center;padding:24px;flex-direction:column;gap:14px}
.lightbox.open{display:flex}
.lightbox img{max-width:min(1000px,92vw);max-height:80vh;border-radius:10px;box-shadow:var(--shadow-lg)}
.lightbox .cap{color:#fff;font-size:14px;text-align:center;max-width:600px}
.lightbox button{position:absolute;top:18px;right:22px;background:rgba(255,255,255,.14);color:#fff;border:none;width:42px;height:42px;border-radius:50%;font-size:22px;cursor:pointer}
.lightbox .nav-arrow{position:absolute;top:50%;transform:translateY(-50%);background:rgba(255,255,255,.14);color:#fff;border:none;width:46px;height:46px;border-radius:50%;font-size:24px;cursor:pointer}
.lightbox .prev{left:22px}.lightbox .next{right:22px}

/* News */
.news li{display:grid;grid-template-columns:70px 96px 1fr;gap:14px;padding:13px 0;border-bottom:1px solid var(--line);align-items:baseline;font-size:14px}
.news .d{font-family:var(--mono);font-size:12px;color:var(--muted)}
.news .tag{font-size:11px;font-weight:600;color:var(--teal-d);background:var(--teal-tint);padding:3px 9px;border-radius:999px;text-align:center;justify-self:start}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.contact-card a{font-weight:500}
.contact-row{display:flex;gap:12px;align-items:flex-start;padding:11px 0;border-bottom:1px solid var(--line);font-size:14.5px}
.contact-row svg{width:19px;height:19px;color:var(--teal);flex:0 0 auto;margin-top:2px}
.contact-row .k{font-size:11.5px;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;font-weight:600}

/* ---------- Footer ---------- */
.footer{background:var(--ink);color:#c7cfd6;padding:44px 0 26px;font-size:14px}
.footer h4{color:#fff;font-family:var(--sans);font-size:13px;text-transform:uppercase;letter-spacing:.08em;margin-bottom:14px;font-weight:700}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px}
.footer a{color:#9fd3db}.footer a:hover{color:#fff}
.foot-links{display:flex;flex-wrap:wrap;gap:8px}
.foot-links a{font-size:12.5px;border:1px solid rgba(255,255,255,.16);padding:6px 10px;border-radius:8px}
.foot-stat{display:flex;gap:14px;align-items:center;margin-bottom:12px}
.foot-stat .num{font-family:var(--serif);font-size:26px;color:#fff;font-weight:600}
.foot-stat .lab{font-size:12px;color:#9aa4ad}
.country-list{display:flex;flex-wrap:wrap;gap:7px;margin-top:8px}
.country-list span{font-size:12px;background:rgba(255,255,255,.08);padding:4px 9px;border-radius:7px}
.foot-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:30px;padding-top:18px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:12.5px;color:#8b959d}

/* ---------- Reveal animation ---------- */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- Responsive ---------- */
@media (max-width:960px){
  .hero-grid{grid-template-columns:1fr;gap:22px}
  .portrait-wrap{max-width:200px}
  .id-card{display:grid;grid-template-columns:200px 1fr;gap:20px;align-items:start}
  .about-grid,.contact-grid{grid-template-columns:1fr}
  .grid-3,.gallery-grid{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:760px){
  .nav-links{position:fixed;top:var(--nav-h);left:0;right:0;background:var(--paper);border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;padding:10px 16px;gap:2px;display:none;box-shadow:var(--shadow-lg)}
  .nav-links.open{display:flex}
  .nav-links a{padding:11px 12px}
  .nav-toggle{display:inline-flex}
  .hero-cols,.grid-2,.metrics{grid-template-columns:1fr 1fr}
  .id-card{grid-template-columns:1fr;justify-items:start}
  .portrait-wrap{max-width:160px}
  .recruit{flex-direction:column;align-items:flex-start;gap:10px}
  .stu-summary{grid-template-columns:1fr}
  .news li{grid-template-columns:1fr;gap:4px}
  .awards li,.plist li{grid-template-columns:1fr;gap:2px}
  .foot-grid{grid-template-columns:1fr}
}
@media (max-width:440px){
  .metrics,.hero-cols,.grid-2{grid-template-columns:1fr}
  .gallery-grid,.grid-3{grid-template-columns:1fr}
  .pub{grid-template-columns:1fr}
  .wrap{padding-inline:16px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none}
}
@media print{
  .nav,.footer,.recruit,.lightbox,.lanes{display:none!important}
  section{padding:14px 0;break-inside:avoid}
  body{background:#fff}
}