/* Sairam SAP — colours follow the Sairam Institutions logo: blue #005aa9, green #8cc63f, star gold #f6b913 */
:root{
  --blue:#005aa9; --blue-d:#00407a; --blue-dd:#062a52; --green:#8cc63f; --green-d:#5f9a1f; --gold:#f6b913;
  --ink:#14233a; --muted:#5a6b82; --line:#e1e8f1; --bg:#f5f8fc; --card:#fff;
  --r:14px; --sh:0 1px 2px rgba(10,40,80,.06),0 6px 20px rgba(10,40,80,.07);
  --font:"Poppins","Noto Sans Tamil",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.55;font-size:16px}
img{max-width:100%;display:block}
a{color:var(--blue)}
.wrap{max-width:1200px;margin:0 auto;padding:0 20px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;flex:none}

/* top bar */
.topbar{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:30}
.topbar-in{display:flex;align-items:center;justify-content:space-between;gap:12px;height:68px}
.brand{display:flex;align-items:center;gap:18px;min-width:0}
.brand a{display:block;line-height:0}
.brand-inst img{height:50px;width:auto}
.brand-sap{padding-left:18px;border-left:2px solid var(--line)}
.brand-sap img{height:52px;width:auto}
.sdg-bar.thin{height:4px}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--blue);color:#fff;text-decoration:none;font:600 15px/1 var(--font);
  padding:12px 18px;border-radius:999px;border:2px solid var(--blue);cursor:pointer;transition:.15s}
.btn:hover{background:var(--blue-d);border-color:var(--blue-d)}
.btn.sm{padding:9px 14px;font-size:14px}
.btn.ghost{background:transparent;color:var(--blue);border-color:var(--line)}
.btn.ghost:hover{border-color:var(--blue)}
.btn.light{background:var(--green);border-color:var(--green);color:#0f2a00}
.btn.light:hover{background:#9fd655;border-color:#9fd655}
.btn.outline{background:transparent;border-color:rgba(255,255,255,.55);color:#fff}
.btn.outline:hover{background:rgba(255,255,255,.12);border-color:#fff}

/* SDG colour strip */
.sdg-bar{display:flex;height:6px}
.sdg-bar i{flex:1;background:var(--c)}

/* landing hero */
.hero{background:radial-gradient(1200px 500px at 85% -10%,rgba(140,198,63,.35),transparent 60%),
  linear-gradient(135deg,var(--blue) 0%,var(--blue-d) 55%,var(--blue-dd) 100%);color:#fff;position:relative;overflow:hidden}
.hero-bg{position:absolute;inset:0;background:url(hero-collage.webp) center/cover;opacity:.13;mix-blend-mode:luminosity}
.hero-mark{position:absolute;left:-2%;bottom:-.18em;font:700 clamp(160px,26vw,380px)/1 var(--font);color:rgba(255,255,255,.045);letter-spacing:-.02em;pointer-events:none;user-select:none}
.wheel{height:auto!important;aspect-ratio:1;position:absolute;right:max(3vw,calc(50% - 640px));top:50%;width:min(460px,38vw);transform:translateY(-50%);opacity:.92;filter:drop-shadow(0 20px 40px rgba(0,0,0,.35));animation:spin 120s linear infinite}
@keyframes spin{to{transform:translateY(-50%) rotate(360deg)}}
@media (prefers-reduced-motion:reduce){.wheel{animation:none}}
.hero-in{padding:64px 20px 56px;position:relative;z-index:1}
.eyebrow{margin:0 0 10px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;font-size:13px;color:#cfe6ff}
.star{color:var(--gold);margin-right:4px}
.hero h1{margin:0;font-size:clamp(30px,5vw,52px);line-height:1.12;font-weight:700;max-width:16ch}
.hero h1 span{display:block;color:var(--green);font-size:.62em;margin-top:6px}
.lead{font-size:clamp(16px,2vw,19px);max-width:60ch;color:#dce9f8;margin:16px 0 0}
.stats{display:grid;grid-template-columns:repeat(4,minmax(0,140px));gap:12px;margin:34px 0 0;padding:0}
.stats div{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);border-radius:12px;padding:12px 14px}
.stats dt{font-size:28px;font-weight:700;line-height:1}
.stats dd{margin:6px 0 0;font-size:13px;color:#cfe0f3}

/* landing main */
.main{padding-top:40px;padding-bottom:56px}
.toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.toolbar h2{margin:0;font-size:26px}
.search{display:flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--line);border-radius:999px;padding:0 16px;
  min-width:min(340px,100%);box-shadow:var(--sh);color:var(--muted)}
.search:focus-within{border-color:var(--blue)}
.search input{border:0;outline:0;font:15px var(--font);padding:12px 0;width:100%;background:none;color:var(--ink)}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:20px 0 26px}
.chip{font:500 14px var(--font);border:1px solid var(--line);background:#fff;color:var(--ink);padding:8px 14px;border-radius:999px;cursor:pointer}
.chip span{color:var(--muted);font-size:12px;margin-left:2px}
.chip:hover{border-color:var(--blue)}
.chip.on{background:var(--blue);border-color:var(--blue);color:#fff}
.chip.on span{color:#cfe0f3}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:22px}
.card{display:flex;flex-direction:column;background:var(--card);border-radius:var(--r);overflow:hidden;text-decoration:none;color:inherit;
  box-shadow:var(--sh);border:1px solid var(--line);transition:transform .18s,box-shadow .18s}
.card[hidden]{display:none!important}
.card:hover{transform:translateY(-4px);box-shadow:0 14px 34px rgba(10,40,80,.14)}
.card-img{aspect-ratio:4/3;background:linear-gradient(160deg,#eaf2fb,#f4f9ec);display:flex;align-items:center;justify-content:center;padding:14px;border-bottom:1px solid var(--line)}
.card-img img{max-height:100%;width:auto;box-shadow:0 4px 14px rgba(0,0,0,.18);border-radius:3px}
.card-img.land img{width:100%;height:auto}
.card-body{padding:16px 18px 18px;display:flex;flex-direction:column;flex:1}
.tag{align-self:flex-start;font-size:11.5px;font-weight:600;color:var(--green-d);background:#eef7e2;padding:3px 10px;border-radius:999px;text-transform:uppercase;letter-spacing:.04em}
.card h3{font-size:17px;line-height:1.35;margin:10px 0 6px}
.card p{margin:0;color:var(--muted);font-size:14px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.card-meta{display:flex;justify-content:space-between;margin-top:auto;padding-top:14px;font-size:13px;color:var(--muted)}
.go{color:var(--blue);font-weight:600}
.empty{text-align:center;color:var(--muted);padding:40px}

/* footer */
.foot{background:var(--blue-dd);color:#c5d6ea;font-size:14px}
.foot-in{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;padding-top:26px;padding-bottom:26px}
.foot p{margin:0}
.foot b{color:#fff}
.foot a{color:var(--green)}

/* item page */
.ihero{background:linear-gradient(135deg,var(--blue) 0%,var(--blue-d) 60%,var(--blue-dd) 100%);color:#fff}
.ihero-in{display:grid;grid-template-columns:240px 1fr;gap:36px;align-items:center;padding-top:40px;padding-bottom:40px}
.icover{width:100%;border-radius:6px;box-shadow:0 18px 40px rgba(0,0,0,.35);background:#fff}
.crumbs{font-size:14px;color:#cfe0f3}
.crumbs a{color:var(--green);text-decoration:none;font-weight:600}
.crumbs span{margin:0 6px}
.ihero h1{font-size:clamp(24px,3.6vw,40px);line-height:1.2;margin:10px 0 0}
.meta{display:flex;flex-wrap:wrap;gap:8px;list-style:none;padding:0;margin:18px 0 0}
.meta li{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.18);padding:4px 12px;border-radius:999px;font-size:13px}
.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}

.reader-bar{position:sticky;top:72px;z-index:20;background:rgba(245,248,252,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.reader-in{display:flex;align-items:center;justify-content:space-between;height:52px}
.back{text-decoration:none;font-weight:600;font-size:14px}
.reader-bar select{font:500 14px var(--font);padding:7px 10px;border-radius:8px;border:1px solid var(--line);background:#fff;color:var(--ink)}
.reader{max-width:880px;margin:0 auto;padding:28px 20px 10px}
.reader.wide{max-width:1240px}
.pg{margin:0 0 26px;scroll-margin-top:130px}
.pg-zoom{display:block;width:100%;padding:0;border:0;background:#fff;cursor:zoom-in;box-shadow:var(--sh);border-radius:4px;overflow:hidden}
.pg-zoom img{width:100%;height:auto}
.pg figcaption{text-align:center;font-size:12.5px;color:var(--muted);margin-top:8px}

.more{padding-top:20px;padding-bottom:50px}
.pn{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.pn a{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 18px;text-decoration:none;color:var(--ink)}
.pn a:hover{border-color:var(--blue)}
.pn small{display:block;color:var(--blue);font-weight:600}
.pn .r{text-align:right}
.more h2{font-size:20px;margin:36px 0 14px}
.minis{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:14px}
.mini{display:flex;flex-direction:column;gap:8px;text-decoration:none;color:var(--ink);font-size:14px;font-weight:500;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px}
.mini img{aspect-ratio:4/3;object-fit:contain;background:#eef3f9;border-radius:6px;width:100%}
.center{text-align:center;margin-top:36px}

/* lightbox */
.lb{position:fixed;inset:0;background:rgba(6,20,40,.96);z-index:100;display:flex;flex-direction:column}
.lb[hidden]{display:none}
.lb-bar{display:flex;justify-content:space-between;align-items:center;color:#fff;padding:10px 16px;font-size:14px}
.lb-bar button{background:rgba(255,255,255,.12);color:#fff;border:0;border-radius:8px;padding:8px 12px;margin-left:8px;font:600 14px var(--font);cursor:pointer}
.lb-scroll{flex:1;overflow:auto;display:flex;-webkit-overflow-scrolling:touch}
.lb-scroll img{margin:auto;max-width:100%;max-height:100%;object-fit:contain}
.lb.zoom .lb-scroll img{max-width:none;max-height:none;width:200%}
.lb-nav{position:absolute;top:50%;transform:translateY(-50%);background:rgba(255,255,255,.14);color:#fff;border:0;width:46px;height:64px;font-size:34px;cursor:pointer;border-radius:8px}
.lb-nav.l{left:10px}.lb-nav.r{right:10px}

@media (max-width:760px){
  .wrap{padding:0 16px}
  .hide-sm{display:none}
  .topbar-in{height:60px}
  .brand{gap:10px}
  .brand-inst img{height:34px}
  .brand-sap{padding-left:10px}
  .brand-sap img{height:36px}
  .wheel{width:300px;right:-110px;top:auto;bottom:-90px;transform:none;opacity:.22;animation:none}
  .hero-in{padding:40px 16px 36px}
  .stats{grid-template-columns:repeat(2,1fr)}
  .toolbar h2{font-size:22px}
  .grid{grid-template-columns:1fr 1fr;gap:12px}
  .card-body{padding:12px}
  .card h3{font-size:14.5px}
  .card p{display:none}
  .tag{font-size:10px;padding:2px 8px}
  .card-meta{font-size:12px}
  .card-meta .go{display:none}
  .chips{flex-wrap:nowrap;overflow-x:auto;margin:16px -16px 20px;padding:0 16px 4px;scrollbar-width:none}
  .chips::-webkit-scrollbar{display:none}
  .chip{white-space:nowrap;flex:none}
  .ihero-in{display:block;padding-top:22px;padding-bottom:24px}
  .icover{display:none}
  .ihero .lead{font-size:15px;margin-top:10px}
  .meta{margin-top:14px}
  .actions{margin-top:18px;gap:8px}
  .actions .btn{padding:10px 14px;font-size:14px}
  .topbar .btn.sm span{display:none}
  .reader-bar{top:64px}
  .reader{padding:16px 8px 6px}
  .pg{margin-bottom:16px}
  .pn{grid-template-columns:1fr}
  .pn .r{text-align:left}
  .lb-nav{display:none}
  .lb.zoom .lb-scroll img{width:260%}
}
@media (max-width:380px){ .grid{grid-template-columns:1fr} }