/* ==========================================================================
   Heatwave Intelligence Platform  |  Use Case KJS-CES-01
   Climate Intelligence for Heatwave Monitoring, Prediction & Early Warning
   Somaiya Vidyavihar University - KJSSE, Department of Information Technology
   ========================================================================== */

:root{
  --ink:#101828; --ink-2:#344054; --ink-3:#667085; --line:#e4e7ec; --line-2:#f2f4f7;
  --paper:#ffffff; --paper-2:#f8fafc; --paper-3:#f1f5f9;
  --brand:#b0202e; --brand-dk:#8c1923; --brand-tint:#fdf2f3;
  --sky:#0b5fa5; --sky-tint:#eaf3fb;
  --normal:#12805c; --caution:#c98a04; --heat:#e2620d; --severe:#c0341c; --extreme:#8b1c34;
  --normal-t:#e7f6f0; --caution-t:#fdf6e3; --heat-t:#fdf0e6; --severe-t:#fcecea; --extreme-t:#f8e9ed;
  --radius:14px; --radius-sm:9px;
  --shadow:0 1px 2px rgba(16,24,40,.05),0 8px 24px -12px rgba(16,24,40,.16);
  --shadow-lg:0 2px 4px rgba(16,24,40,.04),0 18px 44px -18px rgba(16,24,40,.24);
  --sans:"Segoe UI",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;
  --mono:"Cascadia Mono",ui-monospace,Consolas,"Liberation Mono",monospace;
  --wrap:1180px;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0; font-family:var(--sans); color:var(--ink); background:var(--paper);
  font-size:16px; line-height:1.6; -webkit-font-smoothing:antialiased;
}
img,svg{max-width:100%;height:auto;display:block}
a{color:var(--sky);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:3px solid #2563eb;outline-offset:2px;border-radius:4px}
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:22px}
.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-9999px;top:0;background:var(--brand);color:#fff;padding:10px 16px;z-index:200}
.skip:focus{left:8px;top:8px}

/* ---------- Header / navigation ---------- */
.topbar{background:var(--brand);color:#fff;font-size:12.5px;letter-spacing:.02em}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;gap:14px;min-height:34px;flex-wrap:wrap}
.topbar a{color:#fff;text-decoration:underline;text-underline-offset:2px}
.topbar .tag{opacity:.92}

.masthead{border-bottom:1px solid var(--line);background:var(--paper);position:sticky;top:0;z-index:100}
.masthead .wrap{display:flex;align-items:center;gap:18px;min-height:74px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:inherit;margin-right:auto}
.brand:hover{text-decoration:none}
.brand .mark{width:42px;height:42px;flex:none}
.brand .name{font-weight:700;font-size:16.5px;letter-spacing:-.01em;line-height:1.15}
.brand .sub{font-size:11.5px;color:var(--ink-3);letter-spacing:.06em;text-transform:uppercase;font-weight:600}

.nav{display:flex;gap:2px;flex-wrap:wrap}
.nav a{
  padding:9px 13px;border-radius:8px;color:var(--ink-2);font-weight:600;font-size:14.5px;
  text-decoration:none;white-space:nowrap;
}
.nav a:hover{background:var(--paper-3);color:var(--ink);text-decoration:none}
.nav a[aria-current="page"]{background:var(--brand-tint);color:var(--brand-dk)}

/* ---------- Hero ---------- */
.hero{
  background:
    radial-gradient(1100px 420px at 78% -8%, rgba(226,98,13,.16), transparent 62%),
    radial-gradient(760px 360px at 8% 6%, rgba(11,95,165,.12), transparent 60%),
    var(--paper-2);
  border-bottom:1px solid var(--line);
}
.hero .wrap{padding-block:56px 52px}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:44px;align-items:center}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:700;letter-spacing:.1em;
  text-transform:uppercase;color:var(--brand-dk);background:var(--brand-tint);
  border:1px solid #f4d4d7;padding:6px 12px;border-radius:999px;margin-bottom:16px
}
h1{font-size:clamp(30px,4.1vw,46px);line-height:1.1;letter-spacing:-.025em;margin:0 0 16px;font-weight:800}
.lede{font-size:18px;color:var(--ink-2);margin:0 0 26px;max-width:60ch}
.cta-row{display:flex;gap:12px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:9px;padding:12px 20px;border-radius:10px;
  font-weight:650;font-size:15px;text-decoration:none;border:1px solid transparent;cursor:pointer;
  transition:transform .12s ease, box-shadow .12s ease, background .12s ease;
}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--brand);color:#fff;box-shadow:var(--shadow)}
.btn-primary:hover{background:var(--brand-dk)}
.btn-ghost{background:var(--paper);color:var(--ink);border-color:var(--line);box-shadow:var(--shadow)}
.btn-ghost:hover{background:var(--paper-3)}

/* ---------- Sections ---------- */
section{padding-block:58px}
section.tint{background:var(--paper-2);border-block:1px solid var(--line)}
.sec-head{max-width:74ch;margin-bottom:32px}
.sec-head .kicker{
  font-size:12px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--sky);margin:0 0 9px
}
h2{font-size:clamp(23px,2.6vw,31px);line-height:1.2;letter-spacing:-.02em;margin:0 0 12px;font-weight:750}
h3{font-size:18.5px;line-height:1.3;letter-spacing:-.01em;margin:0 0 8px;font-weight:700}
h4{font-size:15px;margin:0 0 6px;font-weight:700;color:var(--ink-2)}
p{margin:0 0 14px}
.sec-head p{color:var(--ink-2);font-size:17px;margin:0}

/* ---------- Cards & grids ---------- */
.grid{display:grid;gap:20px}
.g-2{grid-template-columns:repeat(2,1fr)}
.g-3{grid-template-columns:repeat(3,1fr)}
.g-4{grid-template-columns:repeat(4,1fr)}
.card{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;box-shadow:var(--shadow)
}
.card.pad-lg{padding:26px}
.card h3{margin-bottom:8px}
.card p:last-child{margin-bottom:0}
.card .ico{
  width:40px;height:40px;border-radius:10px;display:grid;place-items:center;margin-bottom:14px;
  background:var(--sky-tint);color:var(--sky)
}
.card .ico svg{width:21px;height:21px}
.phase-no{
  font-family:var(--mono);font-size:12px;font-weight:700;color:var(--brand);
  letter-spacing:.08em;margin-bottom:6px
}

/* ---------- Stat tiles ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.stat{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;box-shadow:var(--shadow)}
.stat .lbl{font-size:12px;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--ink-3);margin-bottom:7px}
.stat .val{font-size:30px;font-weight:750;letter-spacing:-.025em;line-height:1.05;font-variant-numeric:tabular-nums}
.stat .val .unit{font-size:16px;font-weight:600;color:var(--ink-3);margin-left:2px}
.stat .foot{font-size:12.5px;color:var(--ink-3);margin-top:6px}

/* ---------- Severity chips ---------- */
.chip{
  display:inline-flex;align-items:center;gap:7px;padding:4px 11px;border-radius:999px;
  font-size:12.5px;font-weight:700;border:1px solid transparent;white-space:nowrap
}
.chip::before{content:"";width:8px;height:8px;border-radius:50%;background:currentColor;flex:none}
.chip.normal{color:var(--normal);background:var(--normal-t);border-color:#bfe5d7}
.chip.caution{color:var(--caution);background:var(--caution-t);border-color:#f3e0ac}
.chip.heat{color:var(--heat);background:var(--heat-t);border-color:#f7d2b4}
.chip.severe{color:var(--severe);background:var(--severe-t);border-color:#f4c4bc}
.chip.extreme{color:var(--extreme);background:var(--extreme-t);border-color:#eec3ce}
.chip.online{color:var(--normal);background:var(--normal-t);border-color:#bfe5d7}
.chip.offline{color:var(--ink-3);background:var(--paper-3);border-color:var(--line)}

/* ---------- Tables ---------- */
.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--paper);box-shadow:var(--shadow)}
table{border-collapse:collapse;width:100%;font-size:14.5px;min-width:620px}
caption{text-align:left;padding:16px 20px 0;font-weight:700;font-size:15px}
caption .cap-sub{display:block;font-weight:400;font-size:13px;color:var(--ink-3);margin-top:3px}
th,td{padding:11px 16px;text-align:left;border-bottom:1px solid var(--line-2)}
thead th{
  font-size:11.5px;letter-spacing:.07em;text-transform:uppercase;color:var(--ink-3);
  background:var(--paper-2);border-bottom:1px solid var(--line);font-weight:700;white-space:nowrap
}
tbody tr:last-child td{border-bottom:0}
tbody tr:hover{background:var(--paper-2)}
td.num{font-variant-numeric:tabular-nums;text-align:right;font-weight:600}
td.region{font-weight:650}

/* ---------- Charts ---------- */
.chart-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.chart-head{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:18px;flex-wrap:wrap}
.chart-head h3{margin:0}
.chart-head .hint{font-size:13px;color:var(--ink-3);margin:4px 0 0}
.legend{display:flex;gap:16px;flex-wrap:wrap;margin-top:16px;font-size:12.5px;color:var(--ink-2)}
.legend .key{display:inline-flex;align-items:center;gap:7px;font-weight:600}
.legend .sw{width:11px;height:11px;border-radius:3px;flex:none}

/* ---------- Controls ---------- */
.controls{display:flex;gap:14px;flex-wrap:wrap;align-items:flex-end;margin-bottom:24px}
.field{display:flex;flex-direction:column;gap:6px}
.field label{font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-3)}
.field select,.field input{
  font-family:inherit;font-size:14.5px;padding:9px 12px;border:1px solid var(--line);
  border-radius:var(--radius-sm);background:var(--paper);color:var(--ink);min-width:210px
}

/* ---------- Alert banner ---------- */
.alert{
  display:flex;gap:15px;align-items:flex-start;padding:17px 20px;border-radius:var(--radius);
  border:1px solid;margin-bottom:24px
}
.alert .a-ico{flex:none;width:22px;height:22px;margin-top:1px}
.alert h3{font-size:16px;margin:0 0 4px}
.alert p{margin:0;font-size:14.5px}
.alert.severe{background:var(--severe-t);border-color:#f0b8ae;color:#7a2114}
.alert.severe h3{color:var(--severe)}
.alert.info{background:var(--sky-tint);border-color:#c2ddf2;color:#0a4a80}

/* ---------- Advisory cards ---------- */
.advisory{background:var(--paper);border:1px solid var(--line);
  border-left:4px solid var(--brand);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.advisory .meta{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:12px;
  font-size:12px;color:var(--ink-3);font-weight:600;letter-spacing:.04em;text-transform:uppercase}
.advisory ul{margin:12px 0 0;padding-left:20px}
.advisory li{margin-bottom:7px;font-size:14.5px;color:var(--ink-2)}
.advisory li:last-child{margin-bottom:0}
.advisory .src{margin-top:14px;padding-top:12px;border-top:1px dashed var(--line);
  font-size:12.5px;color:var(--ink-3);font-style:italic}

/* ---------- Phases ---------- */
.phases{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.phase{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:20px;
  box-shadow:var(--shadow);position:relative;overflow:hidden}
.phase::after{content:"";position:absolute;inset:0 0 auto 0;height:3px;
  background:linear-gradient(90deg,var(--sky),var(--heat))}

/* ---------- Code blocks ---------- */
pre{
  background:#0f172a;color:#e2e8f0;padding:18px 20px;border-radius:var(--radius);overflow-x:auto;
  font-family:var(--mono);font-size:13px;line-height:1.65;margin:0 0 18px;border:1px solid #1e293b
}
code{font-family:var(--mono);font-size:.92em}
p code,li code,td code{background:var(--paper-3);padding:2px 6px;border-radius:5px;color:var(--brand-dk);border:1px solid var(--line)}

/* ---------- Prose blocks ---------- */
.prose{max-width:74ch}
.prose ul,.prose ol{padding-left:22px;margin:0 0 16px}
.prose li{margin-bottom:8px;color:var(--ink-2)}
.figure{margin:0 0 22px}
.figure figcaption{font-size:13px;color:var(--ink-3);margin-top:9px;text-align:center;font-style:italic}

/* ---------- Footer ---------- */
footer.site{background:#0f172a;color:#cbd5e1;padding-block:44px 28px;font-size:14.5px}
footer.site h3.f-head{color:#fff;font-size:13px;letter-spacing:.09em;text-transform:uppercase;margin:0 0 14px}
footer.site a{color:#cbd5e1}
footer.site a:hover{color:#fff}
.f-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:36px;margin-bottom:30px}
.f-grid ul{list-style:none;margin:0;padding:0}
.f-grid li{margin-bottom:9px}
.f-about p{color:#94a3b8;margin:0;max-width:38ch;font-size:14px}
.f-bot{border-top:1px solid #1e293b;padding-top:20px;display:flex;justify-content:space-between;
  gap:16px;flex-wrap:wrap;font-size:13px;color:#94a3b8}

/* ---------- Responsive ---------- */
@media (max-width:1000px){
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .g-4,.stats{grid-template-columns:repeat(2,1fr)}
  .g-3{grid-template-columns:repeat(2,1fr)}
  .phases{grid-template-columns:repeat(2,1fr)}
  .f-grid{grid-template-columns:repeat(2,1fr);gap:28px}
}
@media (max-width:640px){
  .g-2,.g-3,.g-4,.stats,.phases{grid-template-columns:1fr}
  .masthead .wrap{min-height:auto;padding-block:12px}
  .nav{width:100%}
  section{padding-block:42px}
  .f-grid{grid-template-columns:1fr}
}
@media print{
  .topbar,.masthead,footer.site,.cta-row{display:none}
  body{font-size:11pt}
  .card,.chart-card,.table-scroll{box-shadow:none;break-inside:avoid}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
}