/* ==========================================================
   Rakesh Arya — personal website
   ========================================================== */
:root{
  --ink:#0b1622; --ink-2:#12212f; --ink-3:#1b2f42;
  --paper:#f5f7fa; --card:#ffffff; --line:#e3e8ef;
  --text:#1c2733; --muted:#5b6b7c; --soft:#8696a7;
  --teal:#0fa38b; --teal-2:#14c3a6; --amber:#e9a62b; --sky:#2b7de9; --rose:#d9534f;
  --radius:14px; --shadow:0 1px 2px rgba(16,32,48,.05),0 6px 24px rgba(16,32,48,.06);
  --head:"Space Grotesk",system-ui,sans-serif; --body:"Inter",system-ui,-apple-system,"Segoe UI",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{margin:0;font-family:var(--body);color:var(--text);background:var(--paper);line-height:1.6;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:var(--teal);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}
h1,h2,h3,h4{font-family:var(--head);line-height:1.2;margin:0 0 .5em;letter-spacing:-.01em}
.container{width:min(1180px,92vw);margin:0 auto}

/* ---------- nav ---------- */
.nav{position:fixed;inset:0 0 auto 0;z-index:50;transition:background .25s,box-shadow .25s}
.nav.scrolled{background:rgba(11,22,34,.92);backdrop-filter:blur(10px);box-shadow:0 2px 18px rgba(0,0,0,.25)}
.nav .container{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:.6rem;color:#fff;font-family:var(--head);font-weight:600;font-size:1.1rem}
.brand:hover{text-decoration:none}
.brand-mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--teal-2),var(--sky));display:grid;place-items:center;font-size:.85rem;font-weight:700;color:#04121c}
.nav-links{display:flex;gap:.2rem;list-style:none;margin:0;padding:0}
.nav-links a{color:#c9d6e2;padding:.45rem .75rem;border-radius:8px;font-size:.92rem;font-weight:500}
.nav-links a:hover,.nav-links a.active{color:#fff;background:rgba(255,255,255,.08);text-decoration:none}
.nav-links a.cta{background:var(--teal);color:#fff}
.nav-links a.cta:hover{background:var(--teal-2)}
.nav-toggle{display:none;background:none;border:0;color:#fff;font-size:1.5rem;cursor:pointer}

/* ---------- hero ---------- */
.hero{position:relative;background:radial-gradient(1200px 600px at 80% -10%,#1d3b55 0%,transparent 60%),linear-gradient(180deg,#0b1622,#0e1c2b);color:#e8eef4;padding:140px 0 90px;overflow:hidden}
.hero canvas{position:absolute;inset:0;width:100%;height:100%;opacity:.35}
.hero .container{position:relative;display:grid;grid-template-columns:1.35fr .9fr;gap:3rem;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:.5rem;font-size:.8rem;letter-spacing:.14em;text-transform:uppercase;color:var(--teal-2);font-weight:600}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--teal-2)}
.hero h1{font-size:clamp(2.3rem,5vw,3.8rem);color:#fff;margin:.6rem 0 .4rem}
.hero h1 span{background:linear-gradient(90deg,var(--teal-2),#7cc6ff);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .role{font-size:1.15rem;color:#b9c8d6;margin-bottom:1.2rem}
.hero p.lead{color:#9fb2c4;max-width:58ch}
.btns{display:flex;flex-wrap:wrap;gap:.7rem;margin-top:1.6rem}
.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.75rem 1.2rem;border-radius:10px;font-weight:600;font-size:.95rem;border:1px solid transparent;cursor:pointer;transition:transform .15s,background .2s}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--teal);color:#fff}
.btn-primary:hover{background:var(--teal-2)}
.btn-ghost{border-color:rgba(255,255,255,.25);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.08)}
.btn-dark{background:var(--ink);color:#fff}
.btn svg{width:18px;height:18px}
.hero-card{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.1);border-radius:20px;padding:1.4rem;backdrop-filter:blur(6px)}
.hero-photo{display:flex;gap:1rem;align-items:center;margin-bottom:1.2rem}
.hero-photo img{width:92px;height:92px;border-radius:16px;object-fit:cover;border:2px solid rgba(20,195,166,.6)}
.hero-photo h3{color:#fff;font-size:1.15rem;margin:0}
.hero-photo small{color:#9fb2c4}
.stats{display:grid;grid-template-columns:1fr 1fr;gap:.7rem}
.stat{background:rgba(255,255,255,.04);border-radius:12px;padding:.8rem 1rem}
.stat b{display:block;font-family:var(--head);font-size:1.6rem;color:#fff}
.stat span{display:block;font-size:.8rem;line-height:1.35;color:#9fb2c4;margin-top:.2rem}

/* ---------- sections ---------- */
section{padding:84px 0}
.section-head{display:flex;flex-direction:column;gap:.5rem;margin-bottom:2.2rem}
.section-head h2{font-size:clamp(1.7rem,3vw,2.3rem)}
.section-head h2{margin:0}
.section-head p{color:var(--muted);max-width:70ch;margin:0}
.kicker{font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:var(--teal);font-weight:700;margin-bottom:.4rem}
.alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.dark{background:var(--ink);color:#dce6ef}
.dark .section-head p{color:#9fb2c4}

/* about */
.about-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:2.5rem}
.about-grid p{color:#334252}
.chips{display:flex;flex-wrap:wrap;gap:.45rem;margin-top:.6rem}
.chip{font-size:.8rem;padding:.3rem .65rem;border-radius:999px;background:#eef3f8;color:#2a3b4c;border:1px solid var(--line)}
.chip.t{background:#e6f7f3;border-color:#c5ece3;color:#0b7c69}
.timeline{list-style:none;margin:0;padding:0;border-left:2px solid var(--line)}
.timeline li{position:relative;padding:0 0 1.1rem 1.2rem}
.timeline li::before{content:"";position:absolute;left:-7px;top:.45rem;width:12px;height:12px;border-radius:50%;background:#fff;border:3px solid var(--teal)}
.timeline b{display:block;font-family:var(--head)}
.timeline span{color:var(--muted);font-size:.9rem}
.timeline .yr{font-size:.78rem;color:var(--teal);font-weight:700}

.awards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1rem;margin-top:2.5rem}
.award{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:1.2rem;box-shadow:var(--shadow);display:flex;gap:.9rem}
.award .ic{flex:0 0 42px;height:42px;border-radius:10px;display:grid;place-items:center;background:#fff6e4;color:var(--amber)}
.award h4{font-size:1rem;margin:0 0 .2rem}
.award p{margin:0;font-size:.88rem;color:var(--muted)}

/* resources */
.res-tools{display:flex;flex-wrap:wrap;gap:.8rem;align-items:center;margin-bottom:1.4rem}
.search{flex:1 1 280px;position:relative}
.search input{width:100%;padding:.8rem 1rem .8rem 2.6rem;border-radius:12px;border:1px solid var(--line);font:inherit;background:#fff}
.search input:focus{outline:2px solid rgba(15,163,139,.35);border-color:var(--teal)}
.search svg{position:absolute;left:.85rem;top:50%;transform:translateY(-50%);width:18px;color:var(--soft)}
.filters{display:flex;flex-wrap:wrap;gap:.4rem}
.filter{border:1px solid var(--line);background:#fff;border-radius:999px;padding:.45rem .9rem;font:inherit;font-size:.86rem;cursor:pointer;color:#2a3b4c}
.filter.on{background:var(--ink);color:#fff;border-color:var(--ink)}
.filter .n{opacity:.6;margin-left:.25rem;font-size:.78rem}
.res-meta{color:var(--muted);font-size:.88rem;margin:-.4rem 0 1rem}
.cat-block{margin-bottom:2.2rem}
.cat-title{display:flex;align-items:center;gap:.7rem;margin-bottom:.9rem}
.cat-title .dot{width:12px;height:12px;border-radius:4px}
.cat-title h3{font-size:1.25rem;margin:0}
.cat-title small{color:var(--muted)}
.res-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:.9rem}
.res{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:1rem 1.05rem;display:flex;flex-direction:column;gap:.35rem;transition:border-color .2s,transform .15s,box-shadow .2s;color:inherit}
.res:hover{border-color:var(--teal);transform:translateY(-2px);box-shadow:var(--shadow);text-decoration:none}
.res h4{font-size:1rem;margin:0;display:flex;justify-content:space-between;gap:.5rem;align-items:start}
.res h4 svg{flex:0 0 14px;width:14px;color:var(--soft);margin-top:4px}
.res p{margin:0;color:var(--muted);font-size:.87rem;line-height:1.5}
.tags{display:flex;flex-wrap:wrap;gap:.3rem;margin-top:auto;padding-top:.35rem}
.tag{font-size:.7rem;font-weight:600;padding:.12rem .45rem;border-radius:6px;background:#eef3f8;color:#3c5266}
.tag.os{background:#e6f7f3;color:#0b7c69}
.tag.free{background:#eaf2fe;color:#1d5fc0}
.tag.in{background:#fff3e0;color:#a7660a}
.tag.data{background:#f3ecfd;color:#6a3fbf}
.empty{padding:2rem;text-align:center;color:var(--muted);border:1px dashed var(--line);border-radius:12px}

/* webgis promo */
.promo{display:grid;grid-template-columns:1fr 1.1fr;gap:2.5rem;align-items:center}
.promo ul{padding-left:1.1rem;color:#b9c8d6}
.promo li{margin:.35rem 0}
.promo-shot{border-radius:16px;overflow:hidden;border:1px solid rgba(255,255,255,.12);background:#0e1c2b;aspect-ratio:16/10;position:relative}
.promo-shot iframe{width:100%;height:100%;border:0;pointer-events:none}
.promo-shot a{position:absolute;inset:0;display:grid;place-items:center;background:linear-gradient(180deg,transparent 50%,rgba(11,22,34,.75));color:#fff;font-weight:600}
.promo-shot a span{position:absolute;bottom:1rem;left:1rem;background:var(--teal);padding:.5rem .9rem;border-radius:9px}

/* publications */
.pubs{display:grid;gap:.8rem}
.pub{display:grid;grid-template-columns:70px 1fr;gap:1rem;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:1rem 1.1rem}
.pub .y{font-family:var(--head);font-weight:700;color:var(--teal);font-size:1.15rem}
.pub h4{font-size:1rem;margin:0 0 .2rem;font-family:var(--body);font-weight:600}
.pub p{margin:0;color:var(--muted);font-size:.88rem}

/* cards generic */
.grid3{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1rem}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:1.3rem;box-shadow:var(--shadow)}
.card h4{font-size:1.02rem;margin-bottom:.3rem}
.card p,.card li{color:var(--muted);font-size:.9rem}
.card ul{padding-left:1.1rem;margin:.4rem 0 0}
.card .meta{font-size:.78rem;color:var(--teal);font-weight:700;text-transform:uppercase;letter-spacing:.08em}
.big-num{font-family:var(--head);font-size:2.6rem;color:var(--teal);font-weight:700;line-height:1}
.talks{width:100%;border-collapse:collapse;font-size:.9rem;background:#fff;border-radius:12px;overflow:hidden;border:1px solid var(--line)}
.talks th,.talks td{text-align:left;padding:.7rem .9rem;border-bottom:1px solid var(--line);vertical-align:top}
.talks th{background:#f0f4f8;font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.talks tr:last-child td{border-bottom:0}
.talks td:last-child{white-space:nowrap}
.table-wrap{overflow-x:auto}

/* downloads */
.dl-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:.8rem}
.dl{display:flex;gap:.8rem;align-items:center;background:#fff;border:1px solid var(--line);border-radius:12px;padding:.85rem 1rem;color:inherit}
.dl:hover{border-color:var(--teal);text-decoration:none}
.dl .ic{width:38px;height:38px;border-radius:9px;background:#e6f7f3;color:var(--teal);display:grid;place-items:center;flex:0 0 38px}
.dl b{display:block;font-size:.95rem}
.dl small{color:var(--muted)}

/* contact */
.contact{display:grid;grid-template-columns:1fr 1fr;gap:2rem}
.contact .item{display:flex;gap:.8rem;align-items:center;margin:.8rem 0;color:#dce6ef}
.contact .item .ic{width:40px;height:40px;border-radius:10px;background:rgba(255,255,255,.06);display:grid;place-items:center;color:var(--teal-2)}
.contact a{color:#fff}
.form{display:grid;gap:.7rem}
.form input,.form textarea{width:100%;padding:.8rem 1rem;border-radius:10px;border:1px solid rgba(255,255,255,.14);background:rgba(255,255,255,.04);color:#fff;font:inherit}
.form textarea{min-height:120px;resize:vertical}

footer{background:#08111a;color:#7f93a6;padding:1.6rem 0;font-size:.85rem}
footer .container{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap}
footer a{color:#a9bccd}

/* tiny visitor counter */
.visit-counter{position:fixed;right:10px;bottom:8px;z-index:9999;font:500 10px/1 var(--body);color:#5b6b7c;background:rgba(255,255,255,.85);border:1px solid rgba(0,0,0,.08);border-radius:6px;padding:3px 6px;display:flex;align-items:center;gap:4px;pointer-events:none;backdrop-filter:blur(4px)}
.visit-counter svg{width:10px;height:10px}

.reveal{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

@media (max-width:900px){
  .hero .container,.about-grid,.promo,.contact{grid-template-columns:1fr}
  .nav-links{display:none;position:absolute;top:64px;left:0;right:0;flex-direction:column;background:var(--ink);padding:.8rem 4vw}
  .nav-links.open{display:flex}
  .nav-toggle{display:block}
  .nav{background:rgba(11,22,34,.95)}
}