/* IETE Chennai Centre
   Institutional stylesheet. Flat rules and solid bands rather than shadows and
   gradients; PT Serif for headings, PT Sans for text; two-column pages with a
   sidebar. Motion is limited to what helps orientation. */

:root{
  --navy:#14335e;
  --navy-dk:#0e2647;
  --navy-lt:#27507f;
  --brick:#8b2f2f;
  --ink:#1b1d21;
  --body:#33373f;
  --grey:#5f6672;
  --grey-lt:#7d8492;
  --rule:#d3d8df;
  --rule-lt:#e6e9ee;
  --paper:#ffffff;
  --wash:#f1f3f6;
  --sand:#f8f6f1;

  --wrap:1160px;
  --sans:"PT Sans","Segoe UI",system-ui,-apple-system,Arial,sans-serif;
  --serif:"PT Serif",Georgia,"Times New Roman",serif;
  --ease:cubic-bezier(.25,.6,.35,1);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--paper);color:var(--body);
  font-family:var(--sans);font-size:16.5px;line-height:1.68;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
h1,h2,h3,h4{font-family:var(--serif);color:var(--ink);font-weight:700;line-height:1.25;margin:0 0 .55em}
h1{font-size:clamp(1.6rem,1.25rem + 1.4vw,2.2rem)}
h2{font-size:clamp(1.28rem,1.1rem + .7vw,1.6rem)}
h3{font-size:1.08rem}
h4{font-size:.95rem}
p{margin:0 0 1.05em}
ul,ol{margin:0 0 1.05em;padding-left:1.2em}
li{margin-bottom:.35em}
a{color:var(--navy-lt);text-decoration:none}
a:hover{color:var(--brick);text-decoration:underline;text-underline-offset:3px}
strong{color:var(--ink)}
:focus-visible{outline:2px solid var(--brick);outline-offset:2px}

.wrap{width:min(100% - 2.5rem,var(--wrap));margin-inline:auto}
.small{font-size:.86rem}
.muted{color:var(--grey)}
.tabular{font-variant-numeric:tabular-nums}

.skip{position:absolute;left:-9999px;top:0;z-index:200}
.skip:focus{left:.5rem;top:.5rem;background:#fff;border:2px solid var(--brick);padding:.5rem .9rem}

/* ---------------------------------------------------------------- masthead */
.masthead{background:var(--paper);padding:1.15rem 0 1rem}
.masthead .wrap{display:flex;align-items:center;gap:1.15rem}
.masthead .emblem{width:66px;flex:none}
.mast-name{flex:1 1 auto;min-width:0}
.mast-name .inst{
  display:block;font-family:var(--serif);font-size:clamp(.95rem,.78rem + .55vw,1.24rem);
  font-weight:700;color:var(--navy);line-height:1.24;letter-spacing:.005em
}
.mast-name .centre{
  display:block;margin-top:.22rem;font-size:.76rem;font-weight:700;letter-spacing:.22em;
  text-transform:uppercase;color:var(--brick)
}
.mast-contact{
  flex:none;text-align:right;font-size:.78rem;line-height:1.6;color:var(--grey);
  border-left:1px solid var(--rule);padding-left:1.15rem
}
.mast-contact a{color:var(--grey)}
.mast-contact a:hover{color:var(--brick)}
.mast-est{
  display:block;margin-top:.26rem;font-family:var(--serif);font-size:.76rem;
  font-style:italic;color:var(--grey)
}
.mast-badge{flex:none;width:auto;height:76px;margin-left:.35rem}
.mast-rule{height:3px;background:var(--navy)}
.mast-rule + .mast-rule{height:1px;background:var(--navy);opacity:.35;margin-top:2px}
@media (max-width:900px){
  .mast-contact{display:none}
  .masthead .emblem{width:54px}
  .mast-badge{height:60px;margin-left:0}
}
@media (max-width:560px){
  .masthead .wrap{gap:.8rem}
  .mast-badge{height:48px}
  .mast-est{font-size:.72rem}
}

/* -------------------------------------------------------------------- nav */
.navbar{background:var(--navy);position:sticky;top:0;z-index:60}
.navbar .wrap{display:flex;align-items:stretch}
.navbar ul{display:flex;flex-wrap:wrap;list-style:none;margin:0;padding:0;width:100%}
.navbar li{margin:0}
.navbar a{
  display:block;padding:.82rem .95rem;color:#dbe4f0;font-size:.775rem;font-weight:700;
  letter-spacing:.085em;text-transform:uppercase;white-space:nowrap;
  border-bottom:3px solid transparent;transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease)
}
.navbar a:hover{background:var(--navy-dk);color:#fff;text-decoration:none}
.navbar a[aria-current="page"]{background:var(--navy-dk);color:#fff;border-bottom-color:#c8a95a}
.nav-toggle{display:none;margin-left:auto;align-items:center;gap:.55rem;background:none;border:0;color:#fff;font:inherit;font-size:.8rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;padding:.8rem .2rem;cursor:pointer}
.nav-toggle .bars{position:relative;display:block;width:18px;height:2px;background:#fff}
.nav-toggle .bars::before,.nav-toggle .bars::after{content:"";position:absolute;left:0;width:18px;height:2px;background:#fff;transition:transform .25s var(--ease),top .2s var(--ease)}
.nav-toggle .bars::before{top:-5px}.nav-toggle .bars::after{top:5px}
.nav-toggle[aria-expanded="true"] .bars{background:transparent}
.nav-toggle[aria-expanded="true"] .bars::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .bars::after{top:0;transform:rotate(-45deg)}
@media (max-width:1080px){
  .navbar .wrap{flex-wrap:wrap}
  .nav-toggle{display:flex}
  .navbar ul{flex-direction:column;max-height:0;overflow:hidden;transition:max-height .3s var(--ease)}
  .navbar ul.is-open{max-height:640px}
  .navbar a{border-bottom:0;border-left:3px solid transparent;padding:.75rem .2rem}
  .navbar a[aria-current="page"]{border-left-color:#c8a95a}
  .navbar li + li a{border-top:1px solid rgba(255,255,255,.12)}
}

/* ----------------------------------------------------------------- banner */
.banner{background:var(--navy-dk);color:#c9d6e8;padding:2.1rem 0 2.2rem;border-bottom:3px solid #c8a95a}
.banner h1{color:#fff;margin:0 0 .3rem;font-size:clamp(1.5rem,1.2rem + 1.3vw,2.05rem)}
.banner p{margin:0;font-size:.98rem;max-width:62ch;color:#b7c7dd}
.banner .term{
  display:inline-block;margin-top:1rem;font-size:.74rem;font-weight:700;letter-spacing:.14em;
  text-transform:uppercase;color:#0e2647;background:#c8a95a;padding:.3rem .75rem
}

.pagebar{background:var(--wash);border-bottom:1px solid var(--rule);padding:1.4rem 0 1.5rem}
.pagebar h1{margin:0 0 .25rem}
.pagebar p{margin:0;font-size:.95rem;color:var(--grey);max-width:70ch}
.crumbs{font-size:.78rem;color:var(--grey-lt);margin:0 0 .5rem}
.crumbs a{color:var(--grey)}
.crumbs i{font-style:normal;padding:0 .4rem;opacity:.55}

/* ----------------------------------------------------------------- layout */
.layout{display:grid;grid-template-columns:minmax(0,1fr) 302px;gap:2.4rem;padding:2.6rem 0 3.4rem}
/* grid items default to min-width:auto, which lets the wide activities table
   push the whole page sideways on a phone; this keeps the scroll inside .table-wrap */
.layout > *{min-width:0}
@media (min-width:961px){.layout > aside{border-left:1px solid var(--rule-lt);padding-left:2.2rem}}
.layout--wide{grid-template-columns:minmax(0,1fr)}
@media (max-width:960px){.layout{grid-template-columns:1fr;gap:2.4rem}}
.block{margin-bottom:2.9rem}
.block:last-child{margin-bottom:0}

/* section heading with an underscore rule */
.head{
  display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:0 1.2rem;
  border-bottom:1px solid var(--rule);margin-bottom:1.2rem;position:relative
}
.head::after{content:"";position:absolute;left:0;bottom:-1px;width:64px;height:3px;background:var(--navy)}
.head h2,.head h3{margin:0 0 .55rem}
.head .note{margin:0 0 .62rem;font-size:.82rem;color:var(--grey)}

.lead{font-size:1.06rem;color:var(--body)}
.dropcap::first-letter{
  float:left;font-family:var(--serif);font-size:3.05rem;line-height:.86;font-weight:700;
  color:var(--navy);padding:.06em .12em 0 0
}

/* ------------------------------------------------------------ bulletin list */
.bulletin{list-style:none;margin:0;padding:0;border-top:1px solid var(--rule-lt)}
.bulletin li{display:grid;grid-template-columns:112px minmax(0,1fr);gap:1.1rem;margin:0;padding:.95rem 0;border-bottom:1px solid var(--rule-lt)}
.bulletin .when{font-size:.78rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--brick);padding-top:.22rem}
.bulletin h3{font-size:1rem;margin:0 0 .2rem}
.bulletin p{margin:0;font-size:.92rem;color:var(--grey)}
@media (max-width:520px){
  .bulletin li{grid-template-columns:1fr;gap:.2rem}
  .bulletin .when{padding-top:0}
}
.kind{display:inline-block;font-size:.68rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--navy);background:var(--wash);border:1px solid var(--rule);padding:.1rem .42rem;margin-left:.5rem;vertical-align:.1em}

/* ------------------------------------------------------------------ boxes */
.box{border:1px solid var(--rule);margin-bottom:1.5rem;background:var(--paper)}
.box:last-child{margin-bottom:0}
.box > h3{
  margin:0;background:var(--navy);color:#fff;font-family:var(--sans);font-size:.755rem;
  font-weight:700;letter-spacing:.13em;text-transform:uppercase;padding:.6rem .9rem
}
.box .inner{padding:.95rem .9rem 1.05rem;font-size:.9rem}
.box .inner > :last-child{margin-bottom:0}
.box--sand .inner{background:var(--sand)}
.notices{list-style:none;margin:0;padding:0}
.notices li{margin:0;padding:.7rem 0;border-bottom:1px dotted var(--rule)}
.notices li:first-child{padding-top:0}
.notices li:last-child{border-bottom:0;padding-bottom:0}
.notices .when{display:block;font-size:.7rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--brick);margin-bottom:.15rem}
.notices strong{display:block;font-weight:700;color:var(--ink);line-height:1.45}
.notices span{display:block;color:var(--grey);font-size:.85rem;margin-top:.15rem}
.facts{margin:0;font-size:.88rem}
.facts dt{font-weight:700;color:var(--ink);margin-top:.65rem}
.facts dt:first-child{margin-top:0}
.facts dd{margin:0;color:var(--grey)}
.linklist{list-style:none;margin:0;padding:0;font-size:.9rem}
.linklist li{margin:0;border-bottom:1px dotted var(--rule)}
.linklist li:last-child{border-bottom:0}
.linklist a{display:block;padding:.5rem 0}

/* ---------------------------------------------------------------- buttons */
.btn{
  display:inline-block;padding:.55rem 1.1rem;font-family:var(--sans);font-size:.82rem;font-weight:700;
  letter-spacing:.06em;text-transform:uppercase;border:1px solid var(--navy);
  background:var(--navy);color:#fff;cursor:pointer;
  transition:background .18s var(--ease),color .18s var(--ease)
}
.btn:hover{background:var(--navy-dk);border-color:var(--navy-dk);color:#fff;text-decoration:none}
.btn--plain{background:transparent;color:var(--navy);border-color:var(--rule)}
.btn--plain:hover{background:var(--wash);color:var(--navy-dk);border-color:var(--navy)}
.more{display:inline-block;margin-top:.4rem;font-size:.83rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--brick)}
.more::after{content:" \203A";font-weight:400}

/* ----------------------------------------------------------------- people */
.people{display:grid;gap:1.6rem 1.4rem;grid-template-columns:repeat(auto-fill,minmax(198px,1fr))}
.people--4{grid-template-columns:repeat(4,minmax(0,1fr))}
@media (max-width:1180px) and (min-width:961px){.people--4{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:640px){.people,.people--4{grid-template-columns:repeat(2,minmax(0,1fr));gap:1.2rem .9rem}}
.person figure{margin:0;border:1px solid var(--rule);padding:5px;background:var(--paper)}
.person img{width:100%;height:auto;aspect-ratio:4/5;object-fit:cover;object-position:center 20%;background:var(--wash);opacity:0;transition:opacity .45s var(--ease)}
.person img.is-loaded,.no-js .person img{opacity:1}
.person .role{margin:.7rem 0 .1rem;font-size:.7rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--brick)}
.person h3{font-size:1.02rem;margin:0 0 .25rem}
.person .aff{margin:0;font-size:.84rem;line-height:1.5;color:var(--grey)}
.person .roll{
  margin:0 0 .3rem;font-size:.78rem;letter-spacing:.045em;color:var(--navy);
  font-variant-numeric:tabular-nums
}

/* ----------------------------------------------------------------- tables */
.table-wrap{overflow-x:auto;border:1px solid var(--rule)}
table{border-collapse:collapse;width:100%;min-width:520px;font-size:.91rem}
caption{caption-side:top;text-align:left;padding:.7rem .9rem;font-size:.82rem;color:var(--grey);background:var(--wash);border-bottom:1px solid var(--rule)}
thead th{background:var(--navy);color:#fff;text-align:left;padding:.6rem .9rem;font-size:.73rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase}
tbody th,tbody td{padding:.68rem .9rem;border-top:1px solid var(--rule-lt);vertical-align:top}
tbody th{text-align:left;font-weight:700;color:var(--ink);width:32%}
tbody tr:nth-child(even){background:var(--wash)}

/* ---------------------------------------------------------------- columns */
.cols2{display:grid;grid-template-columns:repeat(auto-fit,minmax(268px,1fr));gap:1.1rem 2.2rem}
.stack{display:grid;gap:1.1rem}
.note-panel{border-left:3px solid var(--navy);background:var(--sand);padding:.95rem 1.1rem;font-size:.92rem}
.note-panel h3{font-size:.97rem;margin:0 0 .3rem}
.note-panel p:last-child{margin-bottom:0}
.numbered{list-style:none;margin:0;padding:0;counter-reset:step}
.numbered li{counter-increment:step;position:relative;padding:0 0 1.05rem 2.5rem;margin:0}
.numbered li::before{
  content:counter(step);position:absolute;left:0;top:.05rem;width:1.7rem;height:1.7rem;
  border:1px solid var(--navy);color:var(--navy);font-family:var(--serif);font-weight:700;
  font-size:.9rem;display:grid;place-items:center
}
.numbered h3{font-size:1rem;margin:0 0 .2rem}
.numbered p{margin:0;font-size:.92rem;color:var(--grey)}

/* -------------------------------------------------------------- accordion */
.acc{border:1px solid var(--rule);border-bottom:0}
.acc:last-of-type{border-bottom:1px solid var(--rule)}
.acc summary{
  list-style:none;cursor:pointer;padding:.85rem 2.6rem .85rem 1rem;position:relative;
  font-family:var(--serif);font-weight:700;color:var(--ink);font-size:1rem;
  transition:background .18s var(--ease)
}
.acc summary::-webkit-details-marker{display:none}
.acc summary:hover{background:var(--wash)}
.acc summary::after{content:"+";position:absolute;right:1rem;top:.78rem;font-family:var(--sans);font-size:1.2rem;color:var(--brick)}
.acc[open] summary::after{content:"\2212"}
.acc[open] summary{background:var(--wash)}
.acc .acc-body{padding:.95rem 1rem 1.1rem;border-top:1px solid var(--rule-lt);font-size:.93rem}
.acc .acc-body > :last-child{margin-bottom:0}

/* ---------------------------------------------------------------- gallery */
.filters{display:flex;flex-wrap:wrap;gap:.4rem;margin-bottom:1.4rem;padding-bottom:1.1rem;border-bottom:1px solid var(--rule-lt)}
.filters button{font-size:.78rem;padding:.42rem .85rem}
.gallery{display:grid;gap:1.15rem;grid-template-columns:repeat(auto-fill,minmax(190px,1fr))}
.gallery button{display:block;width:100%;padding:5px;border:1px solid var(--rule);background:var(--paper);cursor:pointer;text-align:left;transition:border-color .2s var(--ease),background .2s var(--ease)}
.gallery button:hover{border-color:var(--navy);background:var(--wash)}
.gallery img{width:100%;height:auto;aspect-ratio:2/3;object-fit:cover;object-position:top center;background:var(--wash)}
.gallery--wide{grid-template-columns:repeat(auto-fill,minmax(248px,1fr))}
.gallery--wide img{aspect-ratio:4/3;object-position:center}
.gallery--wide .cap{min-height:3.3em}
.gallery .cap{display:block;padding:.55rem .2rem .1rem;font-size:.79rem;line-height:1.45;color:var(--body)}
.lightbox{position:fixed;inset:0;z-index:200;display:none;place-items:center;padding:2rem 1rem;background:rgba(12,20,34,.92);opacity:0;transition:opacity .22s var(--ease)}
.lightbox.is-open{display:grid}
.lightbox.is-visible{opacity:1}
.lightbox img{max-width:min(92vw,720px);max-height:86vh;object-fit:contain;background:#fff}
.lightbox .lb-cap{color:#cfdaea;font-size:.85rem;text-align:center;margin:.9rem 0 0}
.lightbox .lb-close{position:absolute;top:1rem;right:1.1rem;width:40px;height:40px;border:1px solid rgba(255,255,255,.35);background:none;color:#fff;font-size:1.3rem;cursor:pointer}
.lightbox .lb-close:hover{background:rgba(255,255,255,.14)}

/* ------------------------------------------------------------------ forms */
.field{margin-bottom:.95rem}
label{display:block;font-size:.82rem;font-weight:700;color:var(--ink);margin-bottom:.28rem}
input,select,textarea{
  width:100%;padding:.55rem .65rem;border:1px solid var(--rule);border-radius:0;
  font:inherit;font-size:.94rem;color:var(--ink);background:#fff;
  transition:border-color .18s var(--ease)
}
input:focus,select:focus,textarea:focus{outline:0;border-color:var(--navy)}
textarea{min-height:132px;resize:vertical}
.form-status{display:none;margin-top:.9rem;padding:.7rem .85rem;font-size:.88rem;background:var(--sand);border-left:3px solid var(--navy)}
.form-status.is-shown{display:block}

/* ----------------------------------------------------------------- footer */
.site-footer{background:var(--navy-dk);color:#a6b8d2;font-size:.88rem;border-top:3px solid #c8a95a}
.site-footer .cols{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.3fr;gap:2.4rem;padding:2.4rem 0 2.2rem}
@media (max-width:860px){.site-footer .cols{grid-template-columns:1fr 1fr;gap:1.8rem}}
@media (max-width:520px){.site-footer .cols{grid-template-columns:1fr}}
.site-footer h4{font-family:var(--sans);font-size:.72rem;letter-spacing:.15em;text-transform:uppercase;color:#fff;margin:0 0 .85rem;padding-bottom:.5rem;border-bottom:1px solid rgba(255,255,255,.16)}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin-bottom:.42rem}
.site-footer a{color:#a6b8d2}
.site-footer a:hover{color:#e2c982}
.site-footer p{margin:0 0 .8rem;line-height:1.6}
.foot-name{font-family:var(--serif);color:#fff;font-size:1.02rem;font-weight:700;margin-bottom:.5rem;display:block}
.motto{font-family:var(--serif);font-style:italic;color:#b9c9e0;font-size:.92rem}
.colophon{border-top:1px solid rgba(255,255,255,.14);padding:1rem 0 1.2rem;font-size:.79rem;color:#8ba0bf;display:flex;flex-wrap:wrap;gap:.4rem 1.6rem;justify-content:space-between}

.to-top{
  position:fixed;right:1rem;bottom:1rem;z-index:70;border:1px solid var(--rule);background:#fff;
  color:var(--navy);font-size:.74rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;
  padding:.5rem .8rem;cursor:pointer;opacity:0;visibility:hidden;
  transition:opacity .25s var(--ease),visibility .25s
}
.to-top.is-shown{opacity:1;visibility:visible}
.to-top:hover{background:var(--navy);color:#fff;border-color:var(--navy)}

/* one quiet entrance for the main content, nothing else */
main{animation:pageIn .34s var(--ease) both}
@keyframes pageIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important}
  .person img{opacity:1}
}
@media print{
  .navbar,.to-top,.filters{display:none!important}
  body{font-size:11pt;color:#000}
  .layout{grid-template-columns:1fr}
}