/* =========================================================
   Ajay K. Singh — portfolio
   Light + dark, Space Grotesk / Inter / JetBrains Mono
   ========================================================= */

:root{
  --ink:#0b0f19;
  --ink-soft:#505a70;
  --ink-faint:#858da0;
  --paper:#fff;
  --mist:#f6f7fb;
  --sunk:#eef0f6;
  --line:rgba(11,15,25,.11);
  --line-soft:rgba(11,15,25,.06);

  --accent:#e98a00;
  --accent-ink:#fff;
  --accent-tint:rgba(233,138,0,.12);
  --live:#1f8f4e;

  --display:"Space Grotesk","Inter",ui-sans-serif,system-ui,sans-serif;
  --sans:"Inter",ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;

  --shell:1120px;
  --r:14px;
  --r-lg:22px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

[data-theme="dark"]{
  --ink:#eef1f6;
  --ink-soft:#a3abbb;
  --ink-faint:#737c8d;
  --paper:#0c0f16;
  --mist:#11151e;
  --sunk:#161b26;
  --line:rgba(255,255,255,.12);
  --line-soft:rgba(255,255,255,.06);

  --accent:#ffa826;
  --accent-ink:#17120a;
  --accent-tint:rgba(255,168,38,.14);
  --live:#6fd39a;
}

*,*::before,*::after{ box-sizing:border-box; }

html{ scroll-behavior:smooth; scroll-padding-top:88px; }

body{
  margin:0;
  font-family:var(--sans);
  font-size:16px;
  line-height:1.65;
  color:var(--ink-soft);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  transition:background .3s, color .3s;
}

h1,h2,h3{ font-family:var(--display); color:var(--ink); font-weight:600; letter-spacing:-.025em; line-height:1.14; margin:0; }
h1{ font-size:clamp(2rem,4.4vw,3.1rem); letter-spacing:-.03em; }
h2{ font-size:clamp(1.7rem,3.2vw,2.3rem); }
h3{ font-size:1.14rem; line-height:1.32; }

p{ margin:0 0 1rem; }
a{ color:inherit; text-decoration:none; }
ul,ol,dl{ margin:0; padding:0; list-style:none; }
img{ max-width:100%; display:block; }
strong{ color:var(--ink); font-weight:600; }
code{ font-family:var(--mono); font-size:.88em; background:var(--sunk); padding:.1em .35em; border-radius:5px; color:var(--ink); }
::selection{ background:var(--accent-tint); color:var(--ink); }
:focus-visible{ outline:2px solid var(--accent); outline-offset:3px; border-radius:4px; }

.shell{ width:100%; max-width:var(--shell); margin-inline:auto; padding-inline:20px; }

.skip{ position:absolute; left:-9999px; background:var(--ink); color:var(--paper); padding:.7rem 1rem; }
.skip:focus{ left:0; top:0; z-index:99; }

/* ---------- shared ---------- */

.eyebrow{ font-size:.71rem; font-weight:600; letter-spacing:.18em; text-transform:uppercase; color:var(--accent); margin:0 0 .7rem; }
.sub{ font-size:1rem; max-width:64ch; }
.dot{ width:7px; height:7px; border-radius:50%; background:var(--accent); display:inline-block; box-shadow:0 0 0 3px var(--accent-tint); }
.muted{ color:var(--ink-faint); }

.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:.5rem;
  padding:.8rem 1.4rem; border-radius:999px;
  font:600 .9rem/1 var(--sans); border:1px solid transparent; cursor:pointer;
  transition:background .2s, border-color .2s, transform .2s, color .2s;
}
.btn-primary{ background:var(--accent); color:var(--accent-ink); }
.btn-primary:hover{ transform:translateY(-2px); filter:brightness(1.05); }
.btn-ghost{ background:transparent; color:var(--ink); border-color:var(--line); }
.btn-ghost:hover{ border-color:var(--ink); transform:translateY(-2px); }
.btn-outline{ background:transparent; color:#fff; border-color:rgba(255,255,255,.3); }
.btn-outline:hover{ border-color:#fff; transform:translateY(-2px); }

.link-arrow{ display:inline-flex; align-items:center; gap:.45rem; font-weight:600; color:var(--ink); font-size:.9rem; border-bottom:1px solid var(--accent); padding-bottom:.15rem; transition:gap .2s var(--ease); }
.link-arrow:hover{ gap:.8rem; }

.live{ color:var(--live); font-weight:500; }
.live:hover{ text-decoration:underline; }

.section{ padding:clamp(3.5rem,7vw,5.5rem) 0; }
.mist{ background:var(--mist); }
.head{ margin-bottom:2.4rem; }
.head h2{ margin-bottom:.7rem; }
.two-col{ display:grid; grid-template-columns:.8fr 1.2fr; gap:clamp(1.8rem,5vw,4rem); align-items:start; }
.sticky{ position:sticky; top:104px; }
.aside{ margin-top:1.4rem; font-size:.92rem; color:var(--ink-faint); max-width:72ch; }

/* placeholders the owner still has to fill in */
.todo{
  font-style:italic; color:var(--accent);
  border-bottom:1px dashed currentColor; padding-bottom:.05rem;
}
.todo::before{ content:"⌁ "; }

/* ---------- header ---------- */

.header{
  position:sticky; top:0; z-index:40;
  background:color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter:blur(12px);
  border-bottom:1px solid transparent; transition:border-color .3s, background .3s;
}
.header.stuck{ border-bottom-color:var(--line); }
.header-in{ display:flex; align-items:center; gap:.8rem; padding-block:.75rem; }

.logo{ display:inline-flex; align-items:center; gap:.6rem; margin-right:auto; }
.logo img{ border-radius:11px; }
.logo span{ display:flex; flex-direction:column; line-height:1.2; }
.logo b{ font-family:var(--display); font-size:.98rem; color:var(--ink); letter-spacing:-.02em; }
.logo i{ font-style:normal; font-size:.64rem; letter-spacing:.14em; text-transform:uppercase; color:var(--ink-faint); }

.nav{ display:flex; align-items:center; gap:.2rem; }
.nav > a{ padding:.5rem .75rem; border-radius:999px; font-size:.89rem; font-weight:500; color:var(--ink-soft); transition:color .2s, background .2s; }
.nav > a:hover{ color:var(--ink); background:var(--mist); }
.nav > a.active{ color:var(--ink); font-weight:600; }
.nav-cta{ color:var(--ink); border:1px solid var(--line); margin-left:.35rem; }
.nav-cta:hover{ border-color:var(--ink); background:transparent !important; }

.icon-btn{
  width:38px; height:38px; border-radius:50%; flex:0 0 auto;
  display:grid; place-items:center; cursor:pointer;
  border:1px solid var(--line); background:transparent; color:var(--ink);
  transition:background .2s, border-color .2s;
}
.icon-btn:hover{ background:var(--mist); }
.icon-btn svg{ width:17px; height:17px; fill:none; stroke:currentColor; stroke-width:1.7; stroke-linecap:round; }
.i-moon{ display:none; }
[data-theme="dark"] .i-sun{ display:none; }
[data-theme="dark"] .i-moon{ display:block; }

.burger{
  display:none; width:40px; height:40px; border-radius:11px;
  border:1px solid var(--line); background:transparent; cursor:pointer;
  flex-direction:column; align-items:center; justify-content:center; gap:4px; padding:0;
}
.burger span{ width:16px; height:2px; background:var(--ink); border-radius:2px; transition:transform .3s, opacity .2s; }
.burger[aria-expanded="true"] span:nth-child(1){ transform:translateY(6px) rotate(45deg); }
.burger[aria-expanded="true"] span:nth-child(2){ opacity:0; }
.burger[aria-expanded="true"] span:nth-child(3){ transform:translateY(-6px) rotate(-45deg); }

/* ---------- hero ---------- */

.hero{ padding:clamp(2.2rem,5vw,3.8rem) 0 clamp(2.8rem,5vw,4.2rem); }
.hero-in{ display:grid; grid-template-columns:1.25fr .75fr; gap:clamp(2rem,5vw,3.6rem); align-items:center; }

.status{
  display:inline-flex; align-items:center; gap:.55rem;
  border:1px solid var(--line); border-radius:999px; padding:.45rem 1rem; margin:0 0 1.3rem;
  font-size:.76rem; font-weight:500; color:var(--ink);
}
.hero h1{ margin-bottom:1.1rem; text-wrap:balance; max-width:20ch; }
.lede{ font-size:1.02rem; max-width:58ch; margin-bottom:1.6rem; }

.actions{ display:flex; flex-wrap:wrap; gap:.6rem; margin-bottom:1.8rem; }

.proof{ display:flex; flex-wrap:wrap; gap:.5rem; margin-bottom:1.3rem; }
.proof li{
  border:1px solid var(--line); border-radius:var(--r); padding:.7rem 1rem;
  display:flex; flex-direction:column; gap:.1rem; background:var(--mist);
}
.proof b{ font-family:var(--display); font-size:1.05rem; color:var(--ink); letter-spacing:-.02em; }
.proof li > span{ font-size:.74rem; color:var(--ink-faint); }

.quicklinks{ display:grid; gap:.45rem; font-size:.88rem; margin:0; }
.quicklinks li{ display:flex; gap:.9rem; align-items:baseline; }
.quicklinks b{ font-family:var(--mono); font-size:.7rem; letter-spacing:.1em; text-transform:uppercase; color:var(--ink-faint); min-width:5rem; font-weight:500; }
.quicklinks a{ color:var(--ink); border-bottom:1px solid var(--line); padding-bottom:.08rem; transition:color .2s, border-color .2s; }
.quicklinks a:hover{ color:var(--accent); border-color:var(--accent); }

.shot{ margin:0; }
.shot img{
  width:100%; height:auto; aspect-ratio:4/5; object-fit:cover; object-position:50% 12%;
  border-radius:var(--r-lg); border:1px solid var(--line); background:var(--mist);
}
.shot figcaption{ margin-top:.7rem; font-size:.74rem; color:var(--ink-faint); text-align:center; }

/* ---------- stat band ---------- */

.band{ border-block:1px solid var(--line); background:var(--mist); }
.stats{ display:grid; grid-template-columns:repeat(6,1fr); }
.stats > div{ padding:1.6rem .9rem; text-align:center; border-left:1px solid var(--line); }
.stats > div:first-child{ border-left:0; }
.stats b{ display:block; font-family:var(--display); font-size:clamp(1.4rem,2.5vw,2rem); color:var(--ink); letter-spacing:-.03em; line-height:1; }
.stats > div > span{ display:block; margin-top:.5rem; font-size:.73rem; color:var(--ink-faint); }

/* ---------- case studies ---------- */

.cases{ display:grid; gap:.9rem; }

.case{
  border:1px solid var(--line); border-radius:var(--r-lg); background:var(--paper);
  overflow:hidden; transition:border-color .25s, box-shadow .25s;
}
.case:hover{ border-color:color-mix(in srgb, var(--accent) 45%, var(--line)); }
.case.is-open{ border-color:color-mix(in srgb, var(--accent) 55%, var(--line)); box-shadow:0 26px 54px -44px rgba(11,15,25,.8); }

.case-head{
  width:100%; display:block; position:relative; text-align:left; cursor:pointer;
  background:none; border:0; color:inherit; font:inherit;
  padding:1.5rem 4rem 1.5rem 1.5rem;
}
.case-meta{ display:flex; align-items:center; gap:.7rem; flex-wrap:wrap; margin-bottom:.6rem; }
.case-no{ font-family:var(--mono); font-size:.76rem; color:var(--accent); }
.tag{ font:700 .65rem/1 var(--sans); letter-spacing:.14em; text-transform:uppercase; color:var(--accent); background:var(--accent-tint); padding:.35rem .65rem; border-radius:999px; }
.case-year{ font-family:var(--mono); font-size:.72rem; color:var(--ink-faint); }
.case-head h3{ font-size:1.3rem; margin-bottom:.3rem; }
.case-role{ font-size:.82rem; color:var(--ink-faint); margin:0 0 .5rem; }
.case-line{ margin:0; font-size:.93rem; max-width:70ch; }

.case-toggle{
  position:absolute; right:1.4rem; top:1.6rem;
  width:32px; height:32px; border-radius:50%; border:1px solid var(--line);
  display:grid; place-items:center; transition:background .25s, border-color .25s;
}
.case-toggle i{ position:relative; width:11px; height:11px; display:block; }
.case-toggle i::before,.case-toggle i::after{
  content:""; position:absolute; inset:50% 0 auto 0; height:1.6px; background:var(--ink);
  transform:translateY(-50%); transition:transform .3s var(--ease), opacity .2s;
}
.case-toggle i::after{ transform:translateY(-50%) rotate(90deg); }
.case.is-open .case-toggle{ background:var(--accent); border-color:var(--accent); }
.case.is-open .case-toggle i::before,.case.is-open .case-toggle i::after{ background:var(--accent-ink); }
.case.is-open .case-toggle i::after{ opacity:0; }

.case-body{ display:grid; grid-template-rows:0fr; transition:grid-template-rows .4s var(--ease); }
.case.is-open .case-body{ grid-template-rows:1fr; }
.case-inner{ overflow:hidden; }
.case.is-open .case-inner{ padding:0 1.5rem 1.6rem; }

.study{ display:grid; gap:.9rem; border-top:1px solid var(--line); padding-top:1.3rem; }
.study > div{ display:grid; grid-template-columns:8.5rem 1fr; gap:1.2rem; }
.study dt{ font:600 .72rem/1.5 var(--sans); letter-spacing:.14em; text-transform:uppercase; color:var(--ink-faint); }
.study dd{ margin:0; font-size:.94rem; max-width:70ch; }

.diagram{ margin:1.5rem 0 1.2rem; padding:1.2rem; border:1px solid var(--line); border-radius:var(--r); background:var(--mist); }
.diagram svg{ width:100%; height:auto; }
.diagram figcaption{ margin-top:.7rem; font-size:.8rem; color:var(--ink-faint); }
.dg rect{ fill:var(--paper); stroke:var(--line); stroke-width:1; }
.dg text{ font-family:var(--sans); font-size:11px; font-weight:600; fill:var(--ink); text-anchor:middle; }
.dg text.sm{ font-size:9px; font-weight:400; fill:var(--ink-faint); }
.dg .ln{ fill:none; stroke:var(--accent); stroke-width:1.3; }
.dg .dash{ stroke:var(--ink-faint); stroke-dasharray:3 4; }

.chips{ display:flex; flex-wrap:wrap; gap:.4rem; }
.chips li{ font-size:.76rem; color:var(--ink-soft); border:1px solid var(--line); border-radius:999px; padding:.28rem .72rem; }
.case-links{ margin:1rem 0 0; font-size:.88rem; }

/* ---------- cards: other systems, stack, about ---------- */

.grid-3{ display:grid; grid-template-columns:repeat(3,1fr); gap:1rem; }
.card{ border:1px solid var(--line); border-radius:var(--r-lg); padding:1.4rem; background:var(--paper); }
.card h3{ font-size:.78rem; letter-spacing:.14em; text-transform:uppercase; color:var(--ink-faint); font-family:var(--sans); font-weight:600; margin-bottom:1rem; }
.card h3 .dot{ margin-right:.45rem; }

.sys-list{ display:grid; gap:1rem; }
.sys-list li b{ display:block; font-size:.96rem; color:var(--ink); margin-bottom:.15rem; }
.sys-list li span{ display:block; font-size:.86rem; }

.facts{ display:grid; gap:.7rem; margin-top:1.6rem; }
.facts > div{ display:grid; grid-template-columns:7.5rem 1fr; gap:1.1rem; padding-bottom:.7rem; border-bottom:1px solid var(--line); }
.facts dt{ font:600 .7rem/1.6 var(--sans); letter-spacing:.12em; text-transform:uppercase; color:var(--ink-faint); }
.facts dd{ margin:0; font-size:.92rem; }

/* ---------- experience ---------- */

.timeline{ position:relative; padding-left:1.9rem; }
.timeline::before{ content:""; position:absolute; left:.4rem; top:.6rem; bottom:.6rem; width:2px; background:linear-gradient(var(--accent), var(--line)); }
.timeline > li{ position:relative; padding-bottom:1.9rem; }
.timeline > li:last-child{ padding-bottom:0; }
.timeline > li::before{ content:""; position:absolute; left:-1.9rem; top:.5rem; width:11px; height:11px; border-radius:50%; background:var(--paper); border:2px solid var(--line); }
.timeline > li.current::before{ background:var(--accent); border-color:var(--accent); box-shadow:0 0 0 5px var(--accent-tint); }
.when{ font-family:var(--mono); font-size:.74rem; color:var(--accent); }
.timeline h3{ margin:.2rem 0 0; font-size:1.1rem; }
.timeline h3 em{ font-style:normal; font-weight:500; color:var(--ink-faint); }
.org{ font-size:.84rem; color:var(--ink-faint); margin:.1rem 0 .6rem; }
.timeline ul{ display:grid; gap:.35rem; }
.timeline ul li{ position:relative; padding-left:1.05rem; font-size:.92rem; }
.timeline ul li::before{ content:""; position:absolute; left:0; top:.62em; width:5px; height:5px; border-radius:50%; background:var(--accent); }

/* ---------- contact ---------- */

.contact{ background:#0b0f19; color:rgba(255,255,255,.75); padding:clamp(3.5rem,6vw,5.5rem) 0; }
[data-theme="dark"] .contact{ background:#070a10; border-top:1px solid var(--line); }
.contact-in{ display:grid; grid-template-columns:1.05fr .95fr; gap:clamp(2rem,5vw,4rem); align-items:center; }
.contact h2{ color:#fff; margin-bottom:.9rem; }
.contact .sub{ max-width:46ch; }
.contact .eyebrow{ color:#ffa826; }
.contact .actions{ margin-bottom:0; }

.contact-list{ border:1px solid rgba(255,255,255,.14); border-radius:var(--r-lg); overflow:hidden; }
.contact-list li{ display:flex; align-items:baseline; justify-content:space-between; gap:1rem; padding:.95rem 1.25rem; border-bottom:1px solid rgba(255,255,255,.1); font-size:.92rem; }
.contact-list li:last-child{ border-bottom:0; }
.contact-list li > span{ font-size:.69rem; letter-spacing:.14em; text-transform:uppercase; color:rgba(255,255,255,.5); }
.contact-list em{ font-style:normal; color:#fff; }
.contact-list a{ color:#fff; border-bottom:1px solid transparent; transition:color .2s, border-color .2s; }
.contact-list a:hover{ color:#ffa826; border-bottom-color:#ffa826; }
.contact .todo{ color:#ffc266; }

/* ---------- footer ---------- */

.footer{ border-top:1px solid var(--line); background:var(--paper); }
.foot-in{ display:flex; align-items:center; justify-content:space-between; gap:1rem; padding-block:1.4rem; font-size:.84rem; color:var(--ink-faint); }
.foot-in p{ margin:0; }
.foot-in nav{ display:flex; gap:1.2rem; }
.foot-in a:hover{ color:var(--accent); }

/* ---------- toast ---------- */

.toast{
  position:fixed; left:50%; bottom:2rem; z-index:60;
  transform:translate(-50%,1.5rem); opacity:0; pointer-events:none;
  background:var(--ink); color:var(--paper);
  padding:.7rem 1.2rem; border-radius:999px; font-size:.85rem; font-weight:500;
  transition:opacity .25s, transform .25s var(--ease);
}
.toast.show{ opacity:1; transform:translate(-50%,0); }

/* ---------- responsive ---------- */

@media (max-width:1040px){
  .stats{ grid-template-columns:repeat(3,1fr); }
  .stats > div:nth-child(4){ border-left:0; }
  .stats > div:nth-child(n+4){ border-top:1px solid var(--line); }
}

@media (max-width:980px){
  .hero-in,.two-col,.contact-in{ grid-template-columns:1fr; }
  .sticky{ position:static; }
  .shot{ max-width:340px; }
  .grid-3{ grid-template-columns:repeat(2,1fr); }
  .study > div{ grid-template-columns:1fr; gap:.2rem; }
}

@media (max-width:820px){
  .burger{ display:flex; }
  .nav{
    position:fixed; left:0; right:0; top:0; z-index:-1;
    margin:0; padding:5.3rem 24px 2rem;
    flex-direction:column; align-items:stretch; gap:.1rem;
    background:var(--paper); border-bottom:1px solid var(--line);
    transform:translateY(-102%); transition:transform .35s var(--ease);
  }
  .nav.open{ transform:translateY(0); }
  .nav > a{ padding:.9rem .3rem; font-size:1.02rem; border-radius:0; border-bottom:1px solid var(--line-soft); }
  .nav > a:hover{ background:none; color:var(--accent); }
  .nav-cta{ margin:1rem 0 0; border-radius:999px; justify-content:center; display:flex; }
}

@media (max-width:620px){
  .grid-3{ grid-template-columns:1fr; }
  .stats{ grid-template-columns:repeat(2,1fr); }
  .stats > div:nth-child(odd){ border-left:0; }
  .stats > div:nth-child(n+3){ border-top:1px solid var(--line); }
  .foot-in{ flex-direction:column; align-items:flex-start; }
  .contact-list li{ flex-direction:column; gap:.2rem; }
  .actions .btn{ flex:1 1 100%; }
  .quicklinks li{ flex-direction:column; gap:.1rem; }
  .facts > div{ grid-template-columns:1fr; gap:.15rem; }
  .case-head{ padding:1.3rem 3.4rem 1.3rem 1.2rem; }
  .case.is-open .case-inner{ padding:0 1.2rem 1.4rem; }
  .diagram{ padding:.9rem; overflow-x:auto; }
  .diagram svg{ min-width:480px; }
}

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *{ transition-duration:.01ms !important; }
}

@media print{
  .header,.contact .actions,.footer nav,.toast,.case-toggle,.shot,.burger,.icon-btn{ display:none; }
  .case-body{ grid-template-rows:1fr !important; }
  .case-inner{ padding:0 0 1rem !important; }
  body{ color:#000; background:#fff; }
  .section{ padding:1.2rem 0; }
  a{ text-decoration:underline; }
}