/* =====================================================================
   CETPGEx · IIT Patna — site stylesheet
   Institutional style: navy + gold, campus photography, Source Serif 4
   headings with Source Sans 3 text, square edges and fine rules.
   ===================================================================== */
@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:200 900;font-display:swap;src:url("../fonts/source-serif-4-latin-wght-normal.woff2") format("woff2-variations"),url("../fonts/source-serif-4-latin-wght-normal.woff2") format("woff2")}
@font-face{font-family:"Source Sans 3";font-style:normal;font-weight:200 900;font-display:swap;src:url("../fonts/source-sans-3-latin-wght-normal.woff2") format("woff2-variations"),url("../fonts/source-sans-3-latin-wght-normal.woff2") format("woff2")}
@font-face{font-family:"Source Sans 3";font-style:italic;font-weight:200 900;font-display:swap;src:url("../fonts/source-sans-3-latin-wght-italic.woff2") format("woff2-variations"),url("../fonts/source-sans-3-latin-wght-italic.woff2") format("woff2")}

/* ---------- tokens ---------- */
:root{
  color-scheme:light;
  --navy:#0A2240;
  --navy-2:#13335F;
  --navy-3:#071830;
  --gold:#C9A227;
  --gold-2:#B38F1E;
  --on-navy:#E8EDF5;
  --on-navy-2:#A9B6CB;
  --bg:#FFFFFF;
  --bg-2:#F4F6F9;
  --surface:#FFFFFF;
  --ink:#1B2433;
  --ink-2:#3D4859;
  --muted:#5F6B7D;
  --line:#D9DFE7;
  --line-2:#E8ECF1;
  --heading:#0A2240;
  --link:#1A4C9C;
  --row-hover:#F3F6FA;
  --tint:#EEF2F8;
  --core:#1A4C9C; --core-bg:#EAF0F9;
  --elec:#7A5A0C; --elec-bg:#FBF3DC;
  --tip-bg:#FBF6E6; --tip-line:#E9D9A0;
  --font:"Source Sans 3",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --serif:"Source Serif 4",Georgia,"Times New Roman",serif;
  --wrap:1200px;
}
:root[data-theme="dark"]{
  color-scheme:dark;
  --bg:#0C1626; --bg-2:#101D31; --surface:#122139;
  --ink:#E3E8F0; --ink-2:#C0C9D6; --muted:#93A0B3;
  --line:#26354E; --line-2:#1D2B42;
  --heading:#F1F4F9; --link:#9DBCF2; --row-hover:#16263F; --tint:#16263F;
  --core:#9DBCF2; --core-bg:rgba(100,150,240,.15);
  --elec:#E6C766; --elec-bg:rgba(201,162,39,.14);
  --tip-bg:rgba(201,162,39,.09); --tip-line:rgba(201,162,39,.32);
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    color-scheme:dark;
    --bg:#0C1626; --bg-2:#101D31; --surface:#122139;
    --ink:#E3E8F0; --ink-2:#C0C9D6; --muted:#93A0B3;
    --line:#26354E; --line-2:#1D2B42;
    --heading:#F1F4F9; --link:#9DBCF2; --row-hover:#16263F; --tint:#16263F;
    --core:#9DBCF2; --core-bg:rgba(100,150,240,.15);
    --elec:#E6C766; --elec-bg:rgba(201,162,39,.14);
    --tip-bg:rgba(201,162,39,.09); --tip-line:rgba(201,162,39,.32);
  }
}

/* ---------- base ---------- */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font);font-size:17px;line-height:1.65;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--link);text-underline-offset:3px}
h1,h2,h3,h4{color:var(--heading);margin:0 0 .5em;line-height:1.2}
h1,h2{font-family:var(--serif);font-weight:600;letter-spacing:-.005em}
h3,h4{font-family:var(--font);font-weight:600}
h2{font-size:clamp(28px,3vw,36px)}
h3{font-size:20px}
p{margin:0 0 1em}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 32px}
.skip{position:absolute;left:-999px;top:0;background:var(--gold);color:#000;padding:8px 14px;z-index:1000}
.skip:focus{left:10px;top:10px}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px}
.ic{width:22px;height:22px}
.ic-sm{width:16px;height:16px;flex-shrink:0}
.nav-only-mobile{display:none}

/* ---------- utility bar + header ---------- */
.utility{background:var(--navy-3);color:var(--on-navy-2);font-size:13.5px}
.utility-in{display:flex;justify-content:space-between;align-items:center;gap:16px;min-height:38px}
.utility nav{display:flex;align-items:center;gap:22px}
.utility a{color:var(--on-navy);text-decoration:none}
.utility a:hover{color:#fff;text-decoration:underline}
.theme-toggle{display:inline-grid;place-items:center;width:30px;height:30px;border:1px solid rgba(232,237,245,.25);border-radius:3px;background:none;color:var(--on-navy);cursor:pointer}
.theme-toggle:hover{border-color:var(--on-navy)}
.theme-toggle svg{width:15px;height:15px}
.theme-toggle .i-sun{display:none}
:root[data-theme="dark"] .theme-toggle .i-sun{display:block}
:root[data-theme="dark"] .theme-toggle .i-moon{display:none}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]) .theme-toggle .i-sun{display:block}
  :root:not([data-theme="light"]) .theme-toggle .i-moon{display:none}
}
.site-header{position:sticky;top:0;z-index:50;background:var(--navy);border-bottom:3px solid var(--gold)}
.header-in{display:flex;align-items:center;gap:24px;min-height:84px}
.brand img{height:56px;width:auto}
.main-nav{display:flex;align-items:center;gap:22px;margin-left:auto}
.main-nav>ul{display:flex;list-style:none;margin:0;padding:0}
.main-nav>ul>li{position:relative}
.main-nav>ul>li>a,.sub-toggle{display:flex;align-items:center;gap:6px;height:84px;padding:0 15px;color:var(--on-navy);text-decoration:none;font:600 15.5px var(--font);letter-spacing:.01em;background:none;border:0;cursor:pointer;position:relative}
.main-nav>ul>li>a::after,.sub-toggle::after{content:"";position:absolute;left:15px;right:15px;bottom:0;height:3px;background:var(--gold);transform:scaleX(0);transition:transform .2s}
.main-nav>ul>li>a:hover::after,.sub-toggle:hover::after,.main-nav li.active>a::after,.main-nav li.active>.sub-toggle::after,.has-sub.open>.sub-toggle::after{transform:scaleX(1)}
.main-nav>ul>li>a:hover,.sub-toggle:hover{color:#fff}
.chev{width:11px;height:11px;transition:transform .2s;opacity:.8}
.has-sub.open .chev{transform:rotate(180deg)}
.sub{list-style:none;margin:0;padding:8px 0;position:absolute;top:100%;left:0;min-width:320px;background:var(--surface);border-top:3px solid var(--gold);box-shadow:0 18px 40px -14px rgba(7,24,48,.35);opacity:0;visibility:hidden;transform:translateY(4px);transition:.16s;z-index:60}
.has-sub:hover .sub,.has-sub:focus-within .sub,.has-sub.open .sub{opacity:1;visibility:visible;transform:none}
.sub a{display:block;padding:10px 22px;color:var(--ink);text-decoration:none;font-size:15.5px;line-height:1.35}
.sub a:hover,.sub a[aria-current]{background:var(--tint);color:var(--heading)}
.sub a[aria-current]{box-shadow:inset 3px 0 0 var(--gold);font-weight:600}
.nav-toggle{display:none;margin-left:auto;background:none;border:0;width:44px;height:44px;padding:11px;cursor:pointer}
.nav-toggle span{display:block;height:2px;background:var(--on-navy);margin:5px 0;transition:.2s}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font:600 15.5px var(--font);letter-spacing:.01em;padding:11px 24px;border-radius:3px;text-decoration:none;border:1.5px solid transparent;cursor:pointer;white-space:nowrap;transition:background-color .15s,border-color .15s,color .15s}
.btn-lg{padding:14px 30px;font-size:16.5px}
.btn-sm{padding:6px 14px;font-size:14px}
.btn-gold{background:var(--gold);color:#1A1405}
.btn-gold:hover{background:var(--gold-2);color:#1A1405}
.btn-navy{background:var(--navy);color:#fff}
.btn-navy:hover{background:var(--navy-2);color:#fff}
:root[data-theme="dark"] .btn-navy{background:#2A4F8E}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .btn-navy{background:#2A4F8E}}
.btn-outline{background:transparent;color:var(--heading);border-color:var(--heading)}
.btn-outline:hover{background:var(--heading);color:var(--bg)}
.btn-line-light{color:#fff;border-color:rgba(255,255,255,.7)}
.btn-line-light:hover{background:#fff;color:var(--navy);border-color:#fff}
.row-btns{display:flex;flex-wrap:wrap;gap:12px}
.mt{margin-top:28px}
.mt-s{margin-top:14px}

/* ================= HOME ================= */
.hero{position:relative;isolation:isolate;min-height:min(78vh,720px);display:flex;align-items:flex-end;color:#fff;background:var(--navy-3);overflow:hidden}
.hero-media{position:absolute;inset:0;z-index:-1;overflow:hidden}
.hero-still,.hv{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hv{opacity:0;transition:opacity 1.4s ease;transform:scale(1.09)} /* trims letterbox bars in the source clips */
.hv.on{opacity:1}
.hero-media::after{content:"";position:absolute;inset:0;background:
  linear-gradient(0deg,rgba(10,34,64,.78) 0%,rgba(10,34,64,.32) 42%,rgba(10,34,64,0) 75%),
  linear-gradient(90deg,rgba(10,34,64,.5) 0%,rgba(10,34,64,0) 60%)}
.hero-in{position:relative;padding-top:120px;padding-bottom:72px;width:100%}
.hero-kicker{font:600 14px var(--font);letter-spacing:.06em;color:var(--on-navy);margin:0 0 16px;padding-left:14px;border-left:3px solid var(--gold)}
.hero-kicker span{opacity:.6;margin:0 6px}
.hero h1{color:#fff;font-size:clamp(38px,5.2vw,68px);font-weight:600;line-height:1.06;margin:0 0 20px}
.lead{font-size:20px;line-height:1.55;max-width:56ch;color:#DCE3EE;margin-bottom:32px}
.lead strong{color:#fff;font-weight:600}
.vid-toggle{display:none;position:absolute;right:32px;bottom:28px;font:600 13px var(--font);color:#fff;background:rgba(7,24,48,.5);border:1px solid rgba(255,255,255,.4);border-radius:3px;padding:6px 12px;cursor:pointer}
.has-video .vid-toggle{display:block}
.vid-toggle:hover{background:rgba(7,24,48,.8)}
.vt-play{display:none}
.vid-paused .vt-play{display:inline}
.vid-paused .vt-pause{display:none}

.stats-band{background:var(--surface);border-bottom:1px solid var(--line)}
.stats{display:grid;grid-template-columns:repeat(4,1fr);margin:0 auto}
.stats>div{padding:30px 28px;border-left:1px solid var(--line)}
.stats>div:first-child{border-left:0;padding-left:0}
.stats dt{font:600 40px/1 var(--serif);color:var(--heading)}
.stats dd{margin:8px 0 0;color:var(--muted);font-size:15.5px}

.sec{padding:84px 0}
.sec-grey{background:linear-gradient(180deg,#F7F9FC 0%,#EDF2F9 100%)}
:root[data-theme="dark"] .sec-grey{background:linear-gradient(180deg,#0F1B2E 0%,#13223A 100%)}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .sec-grey{background:linear-gradient(180deg,#0F1B2E 0%,#13223A 100%)}}
.sec-title{margin-bottom:40px;max-width:760px}
.sec-title h2{margin-bottom:10px;position:relative;padding-bottom:16px}
.sec-title h2::after{content:"";position:absolute;left:0;bottom:0;width:56px;height:3px;background:var(--gold)}
.sec-title p{color:var(--muted);font-size:18px;margin:0}

.prog{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.prog-item{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line)}
/* section videos (slow aerial loops) with a light gradient */
.media-v{position:relative;margin:0;overflow:hidden;background:#DCE3EC}
.media-v video{display:block;width:100%;aspect-ratio:16/9;object-fit:cover}
.media-v::after{content:"";position:absolute;inset:0;pointer-events:none;background:linear-gradient(180deg,rgba(255,255,255,.18) 0%,rgba(255,255,255,0) 35%,rgba(10,34,64,0) 60%,rgba(10,34,64,.28) 100%)}
.prog-body{padding:30px 32px 34px;display:flex;flex-direction:column;flex:1}
.prog-body h3{font:600 24px/1.25 var(--serif);margin-bottom:12px}
.prog-body p{color:var(--ink-2)}
.prog-body ul{margin:0 0 26px;padding-left:20px;color:var(--ink-2)}
.prog-body li{margin:4px 0}
.prog-body li::marker{color:var(--gold)}
.prog-body .btn{margin-top:auto;align-self:flex-start}

.quick{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);border-left:1px solid var(--line)}
.quick li{border-right:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--surface)}
.quick a{display:flex;align-items:center;gap:14px;padding:26px 24px;text-decoration:none;color:var(--heading);font-weight:600;font-size:17px;transition:background-color .15s,color .15s}
.quick .ic{color:var(--link);flex-shrink:0}
.quick a:hover{background:var(--navy);color:#fff}
.quick a:hover .ic{color:var(--gold)}

.phd{display:grid;grid-template-columns:1.05fr 1fr;gap:56px;align-items:center}
.phd-img .media-v video{aspect-ratio:4/3}
.phd-text h3{font:600 23px var(--serif);margin-bottom:8px}
.phd-text>p{color:var(--ink-2);font-size:18px;margin-bottom:26px}

.why{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:36px}
.why li{border-top:2px solid var(--heading);padding-top:22px}
.why .ic{color:var(--gold);width:28px;height:28px;margin-bottom:14px}
.why h3{font-size:19px;margin-bottom:6px}
.why p{color:var(--muted);margin:0}

.cta{position:relative;isolation:isolate;color:#fff;background:var(--navy-3);overflow:hidden}
.cta .hero-media::after{background:linear-gradient(90deg,rgba(10,34,64,.78),rgba(10,34,64,.5))}
.cta-in{padding-top:88px;padding-bottom:88px;text-align:center}
.cta h2{color:#fff;font-size:clamp(30px,3.4vw,42px)}
.cta p{color:#DCE3EE;font-size:19px;margin:0 auto 30px}
.cta .row-btns{justify-content:center}

/* ================= inner pages ================= */
.page-hero{position:relative;isolation:isolate;color:#fff;background:var(--navy);padding:54px 0 50px;overflow:hidden}
.ph-bg{position:absolute;inset:0;z-index:-1;background:
  linear-gradient(90deg,rgba(10,34,64,.97) 0%,rgba(10,34,64,.86) 55%,rgba(10,34,64,.6) 100%),
  url("../../images/campus/campus-aerial-m.jpg") center 40%/cover no-repeat}
.page-hero h1{color:#fff;font-size:clamp(30px,3.6vw,46px);margin:14px 0 8px;max-width:28ch}
.page-hero p{color:#D3DCE8;margin:0;max-width:70ch;font-size:18px}
.page-hero .pre{font-weight:600;font-size:14px;letter-spacing:.06em;color:var(--gold);margin:14px 0 0}
.page-hero .row-btns{margin-top:24px}
.page-hero .btn-outline{color:#fff;border-color:rgba(255,255,255,.7)}
.page-hero .btn-outline:hover{background:#fff;color:var(--navy)}
.page-hero .btn-navy{background:var(--gold);color:#1A1405}
.page-hero .btn-navy:hover{background:var(--gold-2)}
.crumbs{font-size:14px;color:var(--on-navy-2);display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.crumbs a{color:var(--on-navy)}
.crumbs i{font-style:normal;opacity:.6}
.section{padding:56px 0 72px}
.section.tinted{background:var(--bg-2)}
.sec-head{max-width:760px;margin:0 0 22px}
.sec-head p{color:var(--muted)}
.eyebrow{display:none}

.intro-card{border-left:4px solid var(--gold);background:var(--bg-2);padding:26px 30px;margin-bottom:36px}
.intro-card h2{font-size:28px}
.intro-card p{color:var(--ink-2)}
.reg-cols{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.reg-cols.two{grid-template-columns:1fr 1fr}
.reg-cols>div{border-top:3px solid var(--heading);padding-top:18px}
.reg-list{list-style:none;margin:0;padding:0}
.reg-list li{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:13px 0;border-bottom:1px solid var(--line)}
.reg-list span{font-weight:600;color:var(--heading)}

.callout{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap;padding:20px 24px;background:var(--bg-2);border-left:4px solid var(--heading);margin-bottom:24px}
.callout>div:first-child{flex:1 1 360px}
.callout.soft{border-left-color:var(--line)}
.callout.tip{background:var(--tip-bg);border-left-color:var(--gold)}
.group-h{display:flex;align-items:center;gap:10px;font:600 21px var(--serif);margin:6px 0 16px}
.group-h .ic{color:var(--gold)}
.group-h.mt{margin-top:42px}
.muted-note{color:var(--muted);font-size:15.5px}
.note{color:var(--ink-2)}

/* time-table notices */
.tt-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:0 32px;margin-bottom:40px;border-top:1px solid var(--line)}
.tt-card{display:flex;flex-direction:column;gap:6px;padding:20px 0;border-bottom:1px solid var(--line);text-decoration:none;color:var(--ink)}
.tt-card:hover strong{text-decoration:underline}
.tt-tag{font-size:13.5px;font-weight:600;color:var(--gold-2);letter-spacing:.03em}
:root[data-theme="dark"] .tt-tag{color:var(--gold)}
.tt-card strong{font-weight:600;font-size:17.5px;line-height:1.35;color:var(--heading)}
.tt-note{font-size:14.5px;color:var(--ink-2);background:var(--tip-bg);padding:5px 10px}
.reg-go{font-weight:600;font-size:15px;color:var(--link)}
.seg{display:flex;flex-wrap:wrap;gap:0;margin-bottom:30px;border:1px solid var(--line);width:max-content;max-width:100%}
.seg button,.jump a{font:600 15px var(--font);padding:10px 18px;border:0;border-right:1px solid var(--line);background:var(--surface);color:var(--ink);cursor:pointer;text-decoration:none}
.seg button:last-child{border-right:0}
.seg button:hover{background:var(--tint)}
.seg button.active{background:var(--navy);color:#fff}
.jump{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 26px}
.jump a{border:1px solid var(--line);font-size:14px;padding:6px 12px}
.jump a:hover{border-color:var(--heading)}
.tt-group .group-h{font-size:24px}

/* tables */
.table-wrap{overflow-x:auto;border:1px solid var(--line);background:var(--surface);margin-bottom:24px;-webkit-overflow-scrolling:touch}
.data-table{width:100%;border-collapse:collapse;font-size:16.5px}
.data-table th{background:var(--navy);color:#fff;text-align:left;font:600 14.5px var(--font);letter-spacing:.02em;padding:14px 18px;white-space:nowrap}
.data-table td{padding:14px 18px;border-top:1px solid var(--line-2);vertical-align:top}
.data-table tbody tr:nth-child(even) td{background:var(--bg-2)}
.data-table tbody tr:hover td{background:var(--row-hover)}
.data-table td:first-child{color:var(--muted);font-variant-numeric:tabular-nums}
.data-table td:nth-child(4){white-space:nowrap}
.file-link,.pill-link{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;border-radius:3px;font:600 14.5px var(--font);text-decoration:none;white-space:nowrap}
.file-link{border:1px solid var(--link);color:var(--link)}
.file-link svg{width:16px;height:16px}
.file-link:hover{background:var(--link);color:#fff}
:root[data-theme="dark"] .file-link:hover{color:#0C1626}
.pill-link{border:1px solid var(--line);color:var(--heading)}
.pill-link:hover{border-color:var(--heading)}
.exam-block{scroll-margin-top:110px}
.exam-block h2{font-size:22px;margin:32px 0 12px}
.exam-block h2 small{display:block;font:400 15px var(--font);color:var(--muted);margin-top:4px}
.data-table.exam td:first-child{font-weight:600;color:var(--heading);white-space:nowrap}

/* page tools */
.filter-bar{display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between;align-items:center;margin-bottom:18px}
.search{display:flex;align-items:center;gap:10px;flex:1 1 320px;max-width:480px;background:var(--surface);border:1px solid var(--line);border-radius:3px;padding:0 14px}
.search:focus-within{border-color:var(--heading)}
.search svg{width:18px;height:18px;color:var(--muted);flex-shrink:0}
.search input{border:0;outline:0;font:400 16.5px var(--font);padding:11px 0;width:100%;background:transparent;color:var(--ink)}
.legend{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.tag{display:inline-block;font:600 13px var(--font);padding:3px 10px;border-radius:2px}
.tag.core{background:var(--core-bg);color:var(--core)}
.tag.elec{background:var(--elec-bg);color:var(--elec)}

/* timetable grid */
.tt{border-collapse:separate;border-spacing:0;width:100%;min-width:900px;font-size:13.5px}
.tt thead th{position:sticky;top:0;background:var(--navy);color:#fff;padding:12px 10px;text-align:left;font:600 13.5px var(--font);z-index:2}
.tt thead th:first-child{left:0;z-index:3}
.tt tbody th{position:sticky;left:0;background:var(--bg-2);color:var(--heading);font:600 12.5px var(--font);padding:8px 10px;white-space:nowrap;border-top:1px solid var(--line);border-right:1px solid var(--line);z-index:1;text-align:left}
.tt td{border-top:1px solid var(--line-2);border-left:1px solid var(--line-2);padding:5px;vertical-align:top;min-width:150px;background:var(--surface)}
.slot{display:flex;flex-direction:column;gap:1px;padding:7px 9px;margin-bottom:4px;border-left:3px solid}
.slot:last-child{margin-bottom:0}
.slot.core{background:var(--core-bg);border-color:var(--core)}
.slot.elec{background:var(--elec-bg);border-color:var(--gold)}
.s-code{font-size:11.5px;font-weight:600;color:var(--muted)}
.s-title{font-weight:600;color:var(--heading);line-height:1.3}
.s-meta{font-size:12px;color:var(--muted)}
.s-meta b{font-weight:600}
.s-fac{font-size:12.5px;color:var(--ink-2)}
.tt.has-hl .slot{opacity:.22}
.tt.has-hl .slot.hl{opacity:1;box-shadow:0 0 0 2px var(--gold)}

/* moodle / support */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;margin-bottom:34px}
.feature{border-top:3px solid var(--heading);padding-top:20px}
.feature>.ic{color:var(--gold);width:28px;height:28px;margin-bottom:12px}
.feature p{color:var(--ink-2)}
.feature a{font-weight:600}
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:0 32px;margin-bottom:22px;border-top:1px solid var(--line)}
.contact-card{padding:20px 0;border-bottom:1px solid var(--line)}
.contact-card h3{font-size:18px;margin-bottom:6px}
.c-line{display:flex;align-items:center;gap:8px;text-decoration:none;margin-top:4px;word-break:break-all}
.c-line:hover{text-decoration:underline}
.faq-list{max-width:900px;border-top:1px solid var(--line)}
.faq{border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;padding:18px 0;font-weight:600;font-size:18px;color:var(--heading);list-style:none;display:flex;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--gold-2);font-size:24px;line-height:1;transition:transform .2s}
.faq[open] summary::after{transform:rotate(45deg)}
.faq>div{padding:0 0 20px;color:var(--ink-2);max-width:72ch}
.empty-state .quick-grid{margin-top:24px}
.quick-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:0 32px;border-top:1px solid var(--line)}
.quick-card{display:flex;gap:14px;align-items:center;padding:16px 0;border-bottom:1px solid var(--line);text-decoration:none;color:var(--ink)}
.qi{color:var(--gold)}
.quick-card strong{display:block;color:var(--heading)}
.quick-card small{color:var(--muted)}

/* ---------- footer ---------- */
.site-footer{background:var(--navy);color:var(--on-navy-2);font-size:15.5px;border-top:3px solid var(--gold)}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1.1fr;gap:44px;padding-top:64px;padding-bottom:52px}
.f-brand img{height:58px;width:auto;margin-bottom:16px}
.f-brand p{color:var(--on-navy-2)}
.f-btns{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.f-btns .btn{padding:9px 18px;font-size:14.5px}
.site-footer h4{color:#fff;font:600 15px var(--font);letter-spacing:.06em;margin-bottom:16px;padding-bottom:10px;border-bottom:1px solid rgba(232,237,245,.15)}
.site-footer .f-gap{margin-top:28px}
.site-footer ul{list-style:none;margin:0;padding:0;display:grid;gap:9px}
.site-footer a{color:var(--on-navy);text-decoration:none}
.site-footer a:hover{color:#fff;text-decoration:underline}
.f-contact li{display:flex;flex-direction:column}
.f-contact span{font-size:13.5px;color:var(--on-navy-2)}
.f-bottom{background:var(--navy-3)}
.f-bottom-in{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;padding-top:16px;padding-bottom:16px;font-size:14px}

/* ---------- responsive ---------- */
@media (max-width:1180px){
  .main-nav>ul>li>a,.sub-toggle{padding:0 10px;font-size:15px}
  .main-nav>ul>li>a::after,.sub-toggle::after{left:10px;right:10px}
  .why{grid-template-columns:repeat(2,1fr)}
  .quick{grid-template-columns:repeat(2,1fr)}
  .reg-cols{grid-template-columns:1fr}
}
@media (max-width:980px){
  .utility span{display:none}
  .utility-in{justify-content:flex-end}
  .header-in{min-height:70px}
  .brand img{height:46px}
  .nav-toggle{display:block}
  .main-nav{position:fixed;inset:111px 0 0 0;background:var(--navy);flex-direction:column;align-items:stretch;padding:8px 24px 32px;overflow-y:auto;transform:translateX(100%);transition:transform .25s;gap:16px}
  .nav-open .main-nav{transform:none}
  .nav-open{overflow:hidden}
  .main-nav>ul{flex-direction:column}
  .main-nav>ul>li{border-bottom:1px solid rgba(232,237,245,.12)}
  .main-nav>ul>li>a,.sub-toggle{height:auto;width:100%;padding:16px 4px;font-size:18px;justify-content:space-between}
  .main-nav>ul>li>a::after,.sub-toggle::after{display:none}
  .main-nav li.active>a,.main-nav li.active>.sub-toggle{color:var(--gold)}
  .sub{position:static;opacity:1;visibility:visible;transform:none;display:none;box-shadow:none;border:0;background:transparent;min-width:0;padding:0 0 10px}
  .has-sub.open .sub{display:block}
  .sub a{color:var(--on-navy-2);padding:9px 12px}
  .sub a:hover,.sub a[aria-current]{background:rgba(232,237,245,.06);color:#fff}
  .nav-only-mobile{display:block}
  .nav-open .nav-toggle span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav-open .nav-toggle span:nth-child(2){opacity:0}
  .nav-open .nav-toggle span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .prog,.phd{grid-template-columns:1fr;gap:32px}
  .feature-grid{grid-template-columns:1fr}
  .reg-cols.two{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .stats>div:nth-child(3){border-left:0;padding-left:0}
  .stats>div:nth-child(-n+2){border-bottom:1px solid var(--line)}
}
@media (max-width:640px){
  body{font-size:16.5px}
  .wrap{padding:0 18px}
  .utility nav{gap:14px;font-size:13px}
  .hero{min-height:560px}
  .hero-in{padding-top:90px;padding-bottom:64px}
  .lead{font-size:18px}
  .vid-toggle{right:18px;bottom:16px}
  .stats>div{padding:22px 16px}
  .stats>div:nth-child(odd){padding-left:0}
  .sec{padding:60px 0}
  .quick{grid-template-columns:1fr}
  .why{grid-template-columns:1fr;gap:28px}
  .footer-grid{grid-template-columns:1fr}
  .page-hero{padding:40px 0}
  .seg{width:auto}
  .seg button{flex:1 1 auto}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

/* ---------- print ---------- */
@media print{
  :root,:root[data-theme="dark"]{--bg:#fff;--bg-2:#f4f4f4;--surface:#fff;--ink:#000;--ink-2:#222;--heading:#000;--link:#000;--line:#bbb;--line-2:#ddd;--core-bg:#eef2fa;--elec-bg:#faf4e2}
  .utility,.site-header,.site-footer,.filter-bar,.crumbs,.seg,.jump{display:none!important}
  .page-hero{background:none;color:#000;padding:0 0 10px}
  .ph-bg{display:none}
  .page-hero h1{color:#000}
  .table-wrap{overflow:visible}
  .tt{min-width:0;font-size:9px}
  .tt thead th,.data-table th{background:#ddd;color:#000}
  .slot{break-inside:avoid}
}

/* ===== design refinements inspired by leading institute sites ===== */
/* text-size control (Indian institute convention) */
.fs{display:inline-flex;border:1px solid rgba(232,237,245,.25);border-radius:3px;overflow:hidden}
.fs button{background:none;border:0;border-right:1px solid rgba(232,237,245,.25);color:var(--on-navy);font:600 12.5px var(--font);padding:4px 8px;cursor:pointer}
.fs button:last-child{border-right:0}
.fs button:hover{background:rgba(232,237,245,.1)}
body{zoom:var(--zoom,1)}

/* announcements ticker (under the header, home page) */
.ticker{background:var(--surface);border-bottom:1px solid var(--line)}
.ticker-in{display:flex;align-items:center;gap:0;min-height:46px}
.ticker-label{flex-shrink:0;align-self:stretch;display:flex;align-items:center;background:var(--navy);color:#fff;font:600 14px var(--font);letter-spacing:.03em;padding:0 18px;position:relative}
.ticker-label::after{content:"";position:absolute;right:-10px;top:0;bottom:0;width:10px;background:var(--navy);clip-path:polygon(0 0,100% 50%,0 100%)}
.ticker-track{flex:1;overflow:hidden;display:flex;mask-image:linear-gradient(90deg,transparent 0,#000 40px,#000 calc(100% - 40px),transparent 100%);-webkit-mask-image:linear-gradient(90deg,transparent 0,#000 40px,#000 calc(100% - 40px),transparent 100%)}
.ticker-list{display:flex;flex-shrink:0;list-style:none;margin:0;padding:0 0 0 24px;animation:tick 55s linear infinite}
.ticker-list li{white-space:nowrap;padding-right:44px;position:relative}
.ticker-list li::after{content:"";position:absolute;right:20px;top:50%;width:5px;height:5px;margin-top:-2px;background:var(--gold);transform:rotate(45deg)}
.ticker-list a{color:var(--heading);text-decoration:none;font-weight:600;font-size:15.5px}
.ticker-list a:hover{color:var(--link);text-decoration:underline}
.ticker:hover .ticker-list,.ticker:focus-within .ticker-list,.ticker.paused .ticker-list{animation-play-state:paused}
@keyframes tick{from{transform:translateX(0)}to{transform:translateX(-100%)}}
.ticker-pause{flex-shrink:0;background:none;border:1px solid var(--line);color:var(--muted);font-size:11px;width:30px;height:28px;border-radius:3px;cursor:pointer;margin-left:10px}
.ticker-pause:hover{border-color:var(--heading);color:var(--heading)}
@media (prefers-reduced-motion:reduce){.ticker-list{animation:none}.ticker-list[aria-hidden]{display:none}.ticker-track{overflow-x:auto}}

/* stats as a navy panel overlapping the banner (Oxford-style) */
.hero-in{padding-bottom:130px}
.stats-band{background:transparent;border:0;position:relative;z-index:2;margin-top:-70px}
.stats-band .stats{background:var(--navy);box-shadow:0 20px 40px -20px rgba(7,24,48,.5);border-top:3px solid var(--gold);padding:0 12px}
.stats-band .stats>div{border-left-color:rgba(232,237,245,.15);padding:28px 28px}
.stats-band .stats>div:first-child{padding-left:28px}
.stats-band dt{color:#fff}
.stats-band dd{color:var(--on-navy-2)}
.stats-band .wrap.stats{max-width:calc(var(--wrap) - 64px)}

/* text-only program cards */
.prog-item{border-top:4px solid var(--navy);transition:border-color .2s,box-shadow .2s}
:root[data-theme="dark"] .prog-item{border-top-color:var(--gold)}
.prog-item:hover{box-shadow:0 18px 40px -24px rgba(10,34,64,.35)}
.prog-body{padding:38px 40px 40px}
.prog-tag{font-weight:600;font-size:14px;letter-spacing:.06em;color:var(--gold-2);margin:0 0 10px}
:root[data-theme="dark"] .prog-tag{color:var(--gold)}
.prog-body h3{font-size:28px;margin-bottom:14px}

/* centred statement (Stanford-style) */
.statement{background:linear-gradient(180deg,#FFFFFF 0%,#F3F6FB 100%)}
:root[data-theme="dark"] .statement{background:linear-gradient(180deg,#0C1626 0%,#101D31 100%)}
.narrow{max-width:860px;text-align:center}
.sec-title.center{margin-left:auto;margin-right:auto}
.sec-title.center h2::after{left:50%;margin-left:-28px}
.statement h3{font:600 30px/1.25 var(--serif);margin:8px 0 12px}
.statement .narrow>p{font-size:19px;color:var(--ink-2);max-width:60ch;margin:0 auto 30px}
.row-btns.center{justify-content:center}

@media (max-width:980px){
  .stats-band{margin-top:-50px}
  .stats-band .stats>div:nth-child(3){padding-left:28px}
  .stats-band .stats>div:nth-child(-n+2){border-bottom-color:rgba(232,237,245,.15)}
  .hero-in{padding-bottom:110px}
}
@media (max-width:640px){
  .fs{display:none}
  .ticker-label{padding:0 12px;font-size:13px}
  .stats-band .stats{padding:0}
  .stats-band .stats>div{padding:20px 18px!important}
  .prog-body{padding:28px 24px 30px}
  .statement h3{font-size:24px}
}
.vid-toggle{bottom:auto;top:22px}
@media (max-width:640px){.vid-toggle{top:14px;bottom:auto}}

/* ===== touch & readability (phones / tablets) ===== */
.s-code,.s-meta{font-size:12px}
.s-fac{font-size:12.5px}
@media (pointer:coarse){
  .utility nav a{display:inline-flex;align-items:center;min-height:44px}
  .theme-toggle{width:40px;height:40px}
  .theme-toggle svg{width:18px;height:18px}
  .site-footer ul{gap:0}
  .site-footer li>a,.f-contact li a{display:inline-flex;align-items:center;min-height:44px}
  .f-contact li{padding:4px 0}
  .crumbs a{display:inline-flex;align-items:center;min-height:40px}
  .tt-card .reg-go,.feature a,.c-line{min-height:44px;display:inline-flex;align-items:center}
  .ticker-pause{width:40px;height:40px}
  .seg button{min-height:44px}
  .file-link,.pill-link{min-height:40px}
  .btn-sm{min-height:40px}
}
@media (max-width:640px){
  .utility nav a{font-size:14px}
  .utility-in{min-height:44px}
}
@media (pointer:coarse){.f-bottom-in a{display:inline-flex;align-items:center;min-height:44px}}

/* tablets (incl. landscape iPad): use the drawer menu below 1100px */
@media (max-width:1100px){
  .utility span{display:none}
  .utility-in{justify-content:flex-end}
  .header-in{min-height:70px}
  .brand img{height:46px}
  .nav-toggle{display:block}
  .main-nav{position:fixed;inset:111px 0 0 0;background:var(--navy);flex-direction:column;align-items:stretch;padding:8px 24px 32px;overflow-y:auto;transform:translateX(100%);transition:transform .25s;gap:16px;margin:0}
  .nav-open .main-nav{transform:none}
  .nav-open{overflow:hidden}
  .main-nav>ul{flex-direction:column}
  .main-nav>ul>li{border-bottom:1px solid rgba(232,237,245,.12)}
  .main-nav>ul>li>a,.sub-toggle{height:auto;width:100%;padding:16px 4px;font-size:18px;justify-content:space-between}
  .main-nav>ul>li>a::after,.sub-toggle::after{display:none}
  .main-nav li.active>a,.main-nav li.active>.sub-toggle{color:var(--gold)}
  .sub{position:static;opacity:1;visibility:visible;transform:none;display:none;box-shadow:none;border:0;background:transparent;min-width:0;padding:0 0 10px}
  .has-sub:hover .sub{display:none}
  .has-sub.open .sub,.has-sub.open:hover .sub{display:block}
  .sub a{color:var(--on-navy-2);padding:12px 12px}
  .sub a:hover,.sub a[aria-current]{background:rgba(232,237,245,.06);color:#fff}
  .nav-only-mobile{display:block}
  .nav-open .nav-toggle span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav-open .nav-toggle span:nth-child(2){opacity:0}
  .nav-open .nav-toggle span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
}
@media (max-width:1100px) and (pointer:coarse){ .main-nav{inset:115px 0 0 0} }
@media (pointer:coarse){ .fs button{min-width:40px;min-height:40px;font-size:14px} }
/* keep the right-most dropdown (Ph.D.) inside the screen */
@media (min-width:1101px){.main-nav>ul>li:nth-child(5) .sub{left:auto;right:0}}
@media (pointer:coarse){.jump a{min-height:40px;display:inline-flex;align-items:center}}
@media (max-width:480px){.hero h1{font-size:34px}}
@media (max-width:360px){.hero h1{font-size:30px}}