/* ==========================================================================
   drishva.ai — Design System
   Brand Identity System v1.0 · Inter · Navy / Signal Blue / Citation Gold
   Accessibility: all text pairs verified WCAG 2.2 AA minimum
   ========================================================================== */

/* ---------- FONTS (self-hosted — no third-party CDN, GDPR-safe) ---------- */
@font-face{font-family:'Inter';src:url('/assets/fonts/inter-latin-400-normal.woff2') format('woff2');font-weight:400;font-style:normal;font-display:swap;}
@font-face{font-family:'Inter';src:url('/assets/fonts/inter-latin-500-normal.woff2') format('woff2');font-weight:500;font-style:normal;font-display:swap;}
@font-face{font-family:'Inter';src:url('/assets/fonts/inter-latin-600-normal.woff2') format('woff2');font-weight:600;font-style:normal;font-display:swap;}
@font-face{font-family:'Inter';src:url('/assets/fonts/inter-latin-700-normal.woff2') format('woff2');font-weight:700;font-style:normal;font-display:swap;}
@font-face{font-family:'Inter';src:url('/assets/fonts/inter-latin-800-normal.woff2') format('woff2');font-weight:800;font-style:normal;font-display:swap;}

/* ---------- TOKENS ---------- */
:root{
  /* Brand core */
  --navy:#0A0F2C;
  --navy-2:#131E44;
  --navy-3:#20304F;
  --blue:#00C2FF;          /* dark grounds only */
  --blue-deep:#00719B;     /* light grounds — AA on white */
  --blue-tint:#E8F7FE;
  --gold:#F0C45C;          /* dark grounds only */
  --gold-deep:#8A6410;     /* light grounds — AA on white */
  --gold-tint:#FDF7EA;
  --mist:#F6F8FC;
  --white:#FFFFFF;

  /* Text */
  --ink:#141B2B;
  --body:#333B52;
  --muted:#5F6884;
  --on-navy:rgba(255,255,255,.78);
  --on-navy-dim:rgba(255,255,255,.55);

  /* Lines */
  --line:#DFE4EE;
  --line-soft:#EDF0F6;
  --line-dark:rgba(255,255,255,.14);

  /* Scale */
  --sp-1:4px; --sp-2:8px; --sp-3:12px; --sp-4:16px; --sp-5:24px;
  --sp-6:32px; --sp-7:48px; --sp-8:64px; --sp-9:96px; --sp-10:128px;

  --wrap:1180px;
  --measure:68ch;
  --radius:4px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- RESET ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;}
}
body{
  margin:0;
  font-family:'Inter',system-ui,-apple-system,'Segoe UI',Helvetica,Arial,sans-serif;
  font-size:17px;line-height:1.65;color:var(--body);background:var(--white);
  -webkit-font-smoothing:antialiased;
  font-variant-numeric:tabular-nums;
}
img{max-width:100%;height:auto;display:block;}
a{color:var(--blue-deep);text-decoration:none;}
a:hover{text-decoration:underline;text-underline-offset:3px;}
h1,h2,h3,h4{color:var(--navy);margin:0 0 var(--sp-4);line-height:1.15;letter-spacing:-.02em;font-weight:700;}
h1{font-size:clamp(2.25rem,5vw,3.6rem);font-weight:800;letter-spacing:-.035em;line-height:1.06;}
h2{font-size:clamp(1.5rem,3vw,2.15rem);letter-spacing:-.028em;}
h3{font-size:clamp(1.1rem,2vw,1.35rem);font-weight:600;letter-spacing:-.018em;}
h4{font-size:1rem;font-weight:600;letter-spacing:-.01em;}
p{margin:0 0 var(--sp-4);max-width:var(--measure);}
ul,ol{margin:0 0 var(--sp-4);padding-left:1.3em;max-width:var(--measure);}
li{margin-bottom:var(--sp-2);}
li::marker{color:var(--blue-deep);}
strong{color:var(--ink);font-weight:600;}
blockquote{margin:0;}
table{border-collapse:collapse;width:100%;}
:focus-visible{outline:3px solid var(--blue-deep);outline-offset:3px;border-radius:2px;}

/* ---------- SKIP LINK ---------- */
.skip{position:absolute;left:-9999px;top:0;background:var(--navy);color:#fff;padding:var(--sp-3) var(--sp-5);z-index:999;font-weight:600;}
.skip:focus{left:var(--sp-4);top:var(--sp-4);}

/* ---------- LAYOUT ---------- */
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--sp-5);}
.section{padding-block:var(--sp-9);}
.section--tight{padding-block:var(--sp-8);}
.section--navy{background:var(--navy);color:var(--on-navy);}
.section--navy h1,.section--navy h2,.section--navy h3,.section--navy h4{color:#fff;}
.section--navy strong{color:#fff;}
.section--navy a{color:var(--blue);}
.section--mist{background:var(--mist);}
.eyebrow{
  font-size:.72rem;letter-spacing:.22em;text-transform:uppercase;
  font-weight:700;color:var(--blue-deep);margin:0 0 var(--sp-4);
}
.section--navy .eyebrow{color:var(--blue);}
.lead{font-size:clamp(1.05rem,1.7vw,1.3rem);line-height:1.6;color:var(--body);max-width:62ch;}
.section--navy .lead{color:var(--on-navy);}
.rule-gold{width:56px;height:3px;background:var(--gold);border:0;margin:0 0 var(--sp-5);}

/* ---------- HEADER ---------- */
.hdr{position:sticky;top:0;z-index:100;background:rgba(10,15,44,.97);backdrop-filter:saturate(140%) blur(8px);border-bottom:1px solid var(--line-dark);}
.hdr__in{display:flex;align-items:center;gap:var(--sp-6);height:68px;}
.brand{font-weight:800;font-size:1.22rem;letter-spacing:-.04em;color:#fff;text-decoration:none;flex-shrink:0;}
.brand:hover{text-decoration:none;}
.brand .dot{color:var(--blue);}
.nav{display:flex;align-items:center;gap:var(--sp-5);margin-left:auto;}
.nav a{color:rgba(255,255,255,.8);font-size:.92rem;font-weight:500;text-decoration:none;padding-block:var(--sp-2);}
.nav a:hover,.nav a[aria-current="page"]{color:#fff;text-decoration:none;}
.nav a[aria-current="page"]{box-shadow:inset 0 -2px 0 var(--gold);}
.btn{
  display:inline-block;font-weight:600;font-size:.92rem;padding:11px 20px;
  border-radius:var(--radius);text-decoration:none;transition:background .18s var(--ease),color .18s var(--ease);
  border:1px solid transparent;cursor:pointer;
}
.btn:hover{text-decoration:none;}
.btn--primary{background:var(--blue);color:var(--navy);}
.btn--primary:hover{background:#3FD3FF;}
.btn--ghost{border-color:rgba(255,255,255,.32);color:#fff;background:transparent;}
.btn--ghost:hover{background:rgba(255,255,255,.09);}
.btn--dark{background:var(--navy);color:#fff;}
.btn--dark:hover{background:var(--navy-2);}
.btn--outline{border-color:var(--navy);color:var(--navy);background:transparent;}
.btn--outline:hover{background:var(--navy);color:#fff;}
.btn--lg{padding:14px 28px;font-size:1rem;}

.burger{display:none;margin-left:auto;background:none;border:0;color:#fff;padding:var(--sp-2);cursor:pointer;}
.burger svg{display:block;}
.mnav{display:none;}

@media (max-width:940px){
  .nav{display:none;}
  .burger{display:block;}
  .mnav[data-open="true"]{
    display:flex;flex-direction:column;gap:var(--sp-2);
    position:fixed;inset:68px 0 0;background:var(--navy);padding:var(--sp-6) var(--sp-5);z-index:99;overflow-y:auto;
  }
  .mnav a{color:#fff;font-size:1.15rem;font-weight:600;padding:var(--sp-4) 0;border-bottom:1px solid var(--line-dark);text-decoration:none;}
  .mnav .btn{margin-top:var(--sp-5);text-align:center;border-bottom:0;}
}

/* ---------- HERO ---------- */
.hero{background:linear-gradient(158deg,var(--navy) 0%,var(--navy-2) 48%,var(--navy) 100%);color:var(--on-navy);position:relative;overflow:hidden;padding-block:var(--sp-10) var(--sp-9);}
.hero::before{content:"";position:absolute;right:-18%;top:-32%;width:760px;height:760px;border-radius:50%;background:radial-gradient(circle at 40% 40%,rgba(0,194,255,.20),rgba(0,194,255,0) 62%);pointer-events:none;}
.hero::after{content:"";position:absolute;left:-16%;bottom:-42%;width:680px;height:680px;border-radius:50%;background:radial-gradient(circle at 55% 45%,rgba(240,196,92,.12),rgba(240,196,92,0) 62%);pointer-events:none;}
.hero .wrap{position:relative;z-index:2;}
.hero h1{color:#fff;max-width:16ch;}
.hero .lead{color:var(--on-navy);max-width:58ch;margin-top:var(--sp-5);}
.hero__cta{display:flex;flex-wrap:wrap;gap:var(--sp-3);margin-top:var(--sp-7);}
.hero--sub{padding-block:var(--sp-9) var(--sp-8);}
.hero--sub h1{max-width:20ch;}

/* ---------- GRID ---------- */
.grid{display:grid;gap:var(--sp-5);}
.grid--2{grid-template-columns:repeat(2,1fr);}
.grid--3{grid-template-columns:repeat(3,1fr);}
.grid--4{grid-template-columns:repeat(4,1fr);}
.grid--sidebar{grid-template-columns:1.6fr 1fr;gap:var(--sp-8);align-items:start;}
@media (max-width:900px){
  .grid--3,.grid--4{grid-template-columns:repeat(2,1fr);}
  .grid--sidebar{grid-template-columns:1fr;}
}
@media (max-width:620px){
  .grid--2,.grid--3,.grid--4{grid-template-columns:1fr;}
}

/* ---------- CARDS ---------- */
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:var(--sp-6);}
.card--flat{border:0;background:var(--mist);}
.card h3{margin-bottom:var(--sp-3);}
.card p:last-child{margin-bottom:0;}
.card--link{transition:border-color .18s var(--ease),transform .18s var(--ease);}
.card--link:hover{border-color:var(--navy);}
.section--navy .card{background:rgba(255,255,255,.045);border-color:var(--line-dark);}

.stat{border-top:3px solid var(--blue-deep);padding-top:var(--sp-4);}
.stat .n{display:block;font-size:clamp(2rem,4vw,2.8rem);font-weight:800;color:var(--navy);letter-spacing:-.04em;line-height:1;}
.stat .l{display:block;margin-top:var(--sp-3);color:var(--body);font-size:.95rem;max-width:32ch;}
.section--navy .stat{border-top-color:var(--gold);}
.section--navy .stat .n{color:#fff;}
.section--navy .stat .l{color:var(--on-navy);}

/* ---------- EVIDENCE / QUERY BLOCK ---------- */
.evidence{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff;}
.evidence__q{background:var(--navy);color:#fff;padding:var(--sp-5) var(--sp-6);font-size:1.02rem;}
.evidence__q .lbl{display:block;font-size:.68rem;letter-spacing:.2em;text-transform:uppercase;color:var(--blue);font-weight:700;margin-bottom:var(--sp-2);}
.evidence__a{padding:var(--sp-6);}
.evidence__a ol{margin:0;padding-left:1.2em;}
.evidence__a li{margin-bottom:var(--sp-3);}
.evidence__note{background:var(--gold-tint);border-top:1px solid var(--line);padding:var(--sp-4) var(--sp-6);font-size:.94rem;color:var(--ink);}
.evidence__note strong{color:var(--gold-deep);}

/* ---------- METRIC CALLOUT ---------- */
.metric{background:var(--navy);color:#fff;border-radius:var(--radius);padding:var(--sp-7) var(--sp-6);text-align:center;}
.metric .big{display:block;font-size:clamp(2.6rem,7vw,4.2rem);font-weight:800;color:var(--gold);letter-spacing:-.04em;line-height:1;}
.metric .cap{display:block;margin-top:var(--sp-4);color:var(--on-navy);max-width:40ch;margin-inline:auto;}

/* ---------- CALLOUT ---------- */
.callout{border-left:3px solid var(--blue-deep);background:var(--mist);padding:var(--sp-5) var(--sp-6);margin:var(--sp-6) 0;border-radius:0 var(--radius) var(--radius) 0;}
.callout h4{margin-bottom:var(--sp-2);}
.callout p:last-child{margin-bottom:0;}
.callout--gold{border-left-color:var(--gold-deep);background:var(--gold-tint);}
.section--navy .callout{background:rgba(255,255,255,.05);border-left-color:var(--gold);}

/* ---------- TABLE ---------- */
.tbl-wrap{overflow-x:auto;margin:var(--sp-5) 0;-webkit-overflow-scrolling:touch;}
.tbl{font-size:.95rem;min-width:520px;}
.tbl caption{text-align:left;font-size:.85rem;color:var(--muted);padding-bottom:var(--sp-3);}
.tbl th{background:var(--navy);color:#fff;text-align:left;padding:var(--sp-3) var(--sp-4);font-size:.76rem;letter-spacing:.09em;text-transform:uppercase;font-weight:600;}
.tbl td{padding:var(--sp-3) var(--sp-4);border-bottom:1px solid var(--line-soft);vertical-align:top;}
.tbl tbody tr:nth-child(even) td{background:var(--mist);}

/* ---------- LIST BLOCKS ---------- */
.ilist{list-style:none;padding:0;margin:0;max-width:none;}
.ilist li{display:flex;gap:var(--sp-4);padding:var(--sp-5) 0;border-bottom:1px solid var(--line);margin:0;}
.ilist li:first-child{border-top:1px solid var(--line);}
.ilist .k{flex:0 0 148px;font-weight:700;color:var(--navy);}
.ilist .v{flex:1;}
.ilist .v p:last-child{margin-bottom:0;}
@media (max-width:620px){.ilist li{flex-direction:column;gap:var(--sp-2);} .ilist .k{flex:none;}}

/* ---------- CITED LETTERS ---------- */
.letter{display:flex;gap:var(--sp-5);padding:var(--sp-6) 0;border-bottom:1px solid var(--line);}
.letter__c{flex:0 0 64px;font-size:2.6rem;font-weight:800;color:var(--gold-deep);line-height:1;letter-spacing:-.04em;}
.letter__b{flex:1;}
.letter__b h3{margin-bottom:var(--sp-2);}
.letter__b p:last-child{margin-bottom:0;}
@media (max-width:620px){.letter{gap:var(--sp-4);} .letter__c{flex:0 0 44px;font-size:2rem;}}

/* ---------- FAQ (details = crawlable, content always in HTML) ---------- */
.faq{border-top:1px solid var(--line);}
.faq details{border-bottom:1px solid var(--line);}
.faq summary{
  padding:var(--sp-5) 0;font-weight:600;color:var(--navy);cursor:pointer;
  list-style:none;display:flex;justify-content:space-between;align-items:center;gap:var(--sp-4);
  font-size:1.02rem;
}
.faq summary::-webkit-details-marker{display:none;}
.faq summary::after{content:"+";font-size:1.4rem;font-weight:400;color:var(--blue-deep);flex-shrink:0;line-height:1;}
.faq details[open] summary::after{content:"–";}
.faq details > div{padding-bottom:var(--sp-5);}
.faq details > div p:last-child{margin-bottom:0;}

/* ---------- CTA BAND ---------- */
.cta{background:var(--navy);color:var(--on-navy);padding-block:var(--sp-9);text-align:center;position:relative;overflow:hidden;}
.cta::before{content:"";position:absolute;right:-14%;top:-60%;width:620px;height:620px;border-radius:50%;background:radial-gradient(circle at 40% 40%,rgba(0,194,255,.16),rgba(0,194,255,0) 62%);pointer-events:none;}
.cta .wrap{position:relative;z-index:2;}
.cta h2{color:#fff;max-width:22ch;margin-inline:auto;}
.cta .lead{color:var(--on-navy);margin-inline:auto;text-align:center;}
.cta__btns{display:flex;justify-content:center;flex-wrap:wrap;gap:var(--sp-3);margin-top:var(--sp-6);}

/* ---------- FOOTER ---------- */
.ftr{background:var(--navy);color:var(--on-navy-dim);padding-block:var(--sp-8) var(--sp-6);border-top:1px solid var(--line-dark);font-size:.92rem;}
.ftr a{color:rgba(255,255,255,.72);text-decoration:none;}
.ftr a:hover{color:#fff;text-decoration:underline;}
.ftr__grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:var(--sp-6);}
@media (max-width:820px){.ftr__grid{grid-template-columns:1fr 1fr;}}
@media (max-width:520px){.ftr__grid{grid-template-columns:1fr;}}
.ftr h4{color:#fff;font-size:.74rem;letter-spacing:.18em;text-transform:uppercase;margin-bottom:var(--sp-4);font-weight:700;}
.ftr ul{list-style:none;padding:0;margin:0;}
.ftr li{margin-bottom:var(--sp-3);}
.ftr__tag{font-size:.76rem;letter-spacing:.2em;text-transform:uppercase;color:rgba(255,255,255,.42);margin-top:var(--sp-3);}
.ftr__base{margin-top:var(--sp-7);padding-top:var(--sp-5);border-top:1px solid var(--line-dark);display:flex;flex-wrap:wrap;gap:var(--sp-4);justify-content:space-between;font-size:.85rem;color:rgba(255,255,255,.42);}

/* ---------- FORM ---------- */
.form{max-width:560px;}
.field{margin-bottom:var(--sp-5);}
.field label{display:block;font-weight:600;color:var(--navy);margin-bottom:var(--sp-2);font-size:.94rem;}
.field .hint{display:block;font-weight:400;color:var(--muted);font-size:.86rem;margin-top:2px;}
.field input,.field textarea,.field select{
  width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:var(--radius);
  font-family:inherit;font-size:1rem;color:var(--ink);background:#fff;
}
.field input:focus,.field textarea:focus{border-color:var(--blue-deep);}
.field textarea{min-height:120px;resize:vertical;}
.hp{position:absolute;left:-9999px;}

/* ---------- MISC ---------- */
.tag{display:inline-block;padding:3px 9px;border-radius:3px;font-size:.7rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;}
.tag--blue{background:var(--blue-tint);color:var(--blue-deep);}
.tag--gold{background:var(--gold-tint);color:var(--gold-deep);}
.tag--navy{background:#E7EAF2;color:var(--navy);}
.note{font-size:.88rem;color:var(--muted);font-style:italic;}
.crumb{font-size:.85rem;color:var(--on-navy-dim);margin-bottom:var(--sp-4);}
.crumb a{color:rgba(255,255,255,.7);}
.crumb span{color:rgba(255,255,255,.42);}
.center{text-align:center;}
.mb0{margin-bottom:0;}
.mt6{margin-top:var(--sp-6);}
.divider{border:0;border-top:1px solid var(--line);margin:var(--sp-7) 0;}

.next{display:flex;align-items:center;justify-content:space-between;gap:var(--sp-5);
  border:1px solid var(--line);border-left:3px solid var(--gold-deep);border-radius:0 var(--radius) var(--radius) 0;
  padding:var(--sp-5) var(--sp-6);margin-top:var(--sp-7);background:var(--mist);flex-wrap:wrap;}
.next p{margin:0;}
.next .k{font-size:.72rem;letter-spacing:.2em;text-transform:uppercase;color:var(--gold-deep);font-weight:700;display:block;margin-bottom:4px;}

@media print{.hdr,.cta,.burger{display:none;}}