/* ============================================================
   Janak Sharma · portfolio
   Chirpy-inspired layout: fixed left sidebar + content + right rail.
   Tokens → base → sidebar → content/rail → sections → blog → post.
   ============================================================ */

:root{
  --paper:#F6F7F8; --surface:#FFFFFF; --ink:#14171C; --ink-2:#333A44; --muted:#5A616B;
  --hair:#E5E7EB; --hair-2:#EEF0F2; --accent:#0E7A5F; --accent-ink:#0E7A5F;
  --accent-soft:rgba(14,122,95,.10); --tag:#EDEFF6; --code-bg:#F1F2F6; --code-ink:#2B3350;
  --maxw:1040px; --readw:720px; --side:264px;
  --serif:"Charter","Newsreader","Iowan Old Style","Palatino Linotype",Palatino,Georgia,"Times New Roman",serif;
  --sans:"Inter","Helvetica Neue","Segoe UI",system-ui,-apple-system,Roboto,Arial,sans-serif;
  --mono:"SF Mono","JetBrains Mono","Fira Code",ui-monospace,Menlo,Consolas,monospace;
}
@media (prefers-color-scheme:dark){
  :root{--paper:#0E1116;--surface:#161A21;--ink:#E7EAF0;--ink-2:#C3C9D2;--muted:#8E96A2;
    --hair:#232833;--hair-2:#1C212A;--accent:#3FC9A0;--accent-ink:#5AD3AE;--accent-soft:rgba(63,201,160,.16);
    --tag:#1B2130;--code-bg:#171C26;--code-ink:#C4CCE6;}
}
:root[data-theme="light"]{--paper:#F6F7F8;--surface:#FFFFFF;--ink:#14171C;--ink-2:#333A44;--muted:#5A616B;
  --hair:#E5E7EB;--hair-2:#EEF0F2;--accent:#0E7A5F;--accent-ink:#0E7A5F;--accent-soft:rgba(14,122,95,.10);
  --tag:#EDEFF6;--code-bg:#F1F2F6;--code-ink:#2B3350;}
:root[data-theme="dark"]{--paper:#0E1116;--surface:#161A21;--ink:#E7EAF0;--ink-2:#C3C9D2;--muted:#8E96A2;
  --hair:#232833;--hair-2:#1C212A;--accent:#3FC9A0;--accent-ink:#5AD3AE;--accent-soft:rgba(63,201,160,.16);
  --tag:#1B2130;--code-bg:#171C26;--code-ink:#C4CCE6;}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);
  font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  transition:background .35s ease,color .35s ease;
  display:flex;min-height:100vh}
a{color:var(--accent-ink);text-decoration:none}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
img{max-width:100%;display:block}

/* ============================================================
   SIDEBAR
   ============================================================ */
.sidebar{flex:0 0 var(--side);position:sticky;top:0;align-self:flex-start;height:100vh;z-index:50;
  background:color-mix(in srgb,var(--ink) 4%,var(--paper));
  border-right:1px solid var(--hair);
  display:flex;flex-direction:column;align-items:center;
  padding:40px 20px 24px;overflow-y:auto}
.brand{display:flex;flex-direction:column;align-items:center;text-align:center;width:100%}
.brand .avatar{width:110px;height:110px;border-radius:50%;object-fit:cover;
  border:3px solid var(--surface);box-shadow:0 6px 22px -12px rgba(20,23,28,.5)}
.brand .who{font-family:var(--serif);font-size:1.5rem;font-weight:600;letter-spacing:-.01em;
  margin:18px 0 4px;color:var(--ink);line-height:1.2}
.brand .tagline{color:var(--muted);font-size:.86rem;line-height:1.45;max-width:200px}

.snav{width:100%;margin-top:30px;display:flex;flex-direction:column;gap:3px}
.snav a{display:block;text-align:center;padding:12px 14px;border-radius:10px;
  font-size:.82rem;font-weight:600;letter-spacing:.13em;text-transform:uppercase;
  color:var(--muted);transition:background .18s,color .18s}
.snav a:hover{color:var(--ink);background:color-mix(in srgb,var(--ink) 5%,transparent)}
.snav a.active{color:var(--ink);font-weight:800;background:transparent}

.sidebar-foot{margin-top:auto;padding-top:26px;display:flex;align-items:center;justify-content:center;gap:6px;flex-wrap:wrap}
.sidebar-foot a,.sidebar-foot .toggle{width:38px;height:38px;border-radius:9px;display:grid;place-items:center;
  color:var(--muted);background:transparent;border:1px solid transparent;cursor:pointer;transition:.18s}
.sidebar-foot a:hover,.sidebar-foot .toggle:hover{color:var(--accent-ink);background:var(--surface);border-color:var(--hair)}
.sidebar-foot svg{width:19px;height:19px}

/* ============================================================
   CONTENT + RIGHT RAIL
   ============================================================ */
.content{flex:1 1 auto;min-width:0}
.main-wrap{max-width:var(--maxw);margin:0 auto;padding:48px clamp(22px,4vw,52px) 90px;
  display:grid;grid-template-columns:minmax(0,1fr) 232px;gap:clamp(28px,4vw,52px);align-items:start}
.main-col{min-width:0}
section+section{margin-top:clamp(38px,5vw,58px)}

.rail{position:sticky;top:34px;display:flex;flex-direction:column;gap:34px}
.rail .rail-box h3{font-family:var(--sans);font-size:.9rem;font-weight:700;letter-spacing:.02em;color:var(--ink);
  margin:0 0 14px;padding-bottom:12px;border-bottom:1px solid var(--hair)}
.rail .recent{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px}
.rail .recent a{color:var(--ink-2);font-size:.9rem;line-height:1.4;font-weight:500}
.rail .recent a:hover{color:var(--accent-ink)}
.rail .tagcloud{display:flex;flex-wrap:wrap;gap:8px}
.rail .tagcloud a{font-size:.78rem;color:var(--ink-2);background:transparent;border:1px solid var(--hair);
  border-radius:100px;padding:4px 12px;transition:.18s}
.rail .tagcloud a:hover{border-color:var(--accent);color:var(--accent-ink)}

/* ---------- section headings ---------- */
h2.sec{font-family:var(--sans);font-size:1.05rem;font-weight:720;letter-spacing:-.01em;
  color:var(--ink);margin:0 0 20px;padding-bottom:10px;border-bottom:1px solid var(--hair);
  display:flex;align-items:center;gap:11px}
h2.sec::before{content:"";width:3px;height:17px;border-radius:2px;background:var(--accent);flex:0 0 auto}

/* ---------- about / prose ---------- */
.prose p{margin:0 0 16px;color:var(--ink-2);font-size:1rem;line-height:1.72}
.prose p:last-child{margin-bottom:0}
.prose strong{color:var(--ink);font-weight:640}

/* ---------- experience / education rows ---------- */
.rows{display:flex;flex-direction:column}
.row{display:grid;grid-template-columns:150px 1fr;gap:18px;padding:16px 0;border-bottom:1px solid var(--hair-2)}
.row:last-child{border-bottom:0}
.row .yr{font-family:var(--mono);font-size:.68rem;letter-spacing:.03em;color:var(--muted);text-transform:uppercase;padding-top:3px}
.row h3{margin:0;font-size:1.05rem;font-weight:640;letter-spacing:-.01em;color:var(--ink)}
.row .org{color:var(--accent-ink);font-weight:600;font-size:.96rem}
.row .loc{color:var(--muted);font-weight:400}
.row p{margin:7px 0 0;color:var(--ink-2);font-size:.95rem;line-height:1.55}
@media(max-width:520px){.row{grid-template-columns:1fr;gap:4px}.row .yr{order:-1}}

/* ---------- publications ---------- */
.pub{display:grid;grid-template-columns:66px 1fr;gap:18px;padding:4px 0}
.pub .venue{font-family:var(--mono);font-size:.6rem;letter-spacing:.06em;text-transform:uppercase;
  color:#fff;background:var(--accent);border-radius:9px;height:66px;display:flex;flex-direction:column;
  align-items:center;justify-content:center;text-align:center;line-height:1.35;padding:6px}
:root[data-theme="dark"] .pub .venue{color:#0E1116}
@media (prefers-color-scheme:dark){.pub .venue{color:#0E1116}}
.pub h3{margin:0 0 5px;font-size:1.06rem;line-height:1.35;font-weight:640;letter-spacing:-.01em;color:var(--ink)}
.pub .authors{color:var(--muted);font-size:.92rem;margin:0 0 3px}
.pub .authors b{color:var(--ink);font-weight:640}
.pub .meta{color:var(--muted);font-size:.85rem;font-style:italic}

/* ---------- projects (cards) ---------- */
.projs{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:640px){.projs{grid-template-columns:1fr}}
.proj{background:var(--surface);border:1px solid var(--hair);border-radius:14px;padding:18px 20px;
  box-shadow:0 1px 2px rgba(20,23,28,.04);transition:transform .2s,border-color .2s,box-shadow .25s}
.proj:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--accent) 42%,var(--hair));
  box-shadow:0 14px 30px -16px rgba(20,23,28,.28)}
:root[data-theme="dark"] .proj:hover{box-shadow:0 16px 32px -18px rgba(0,0,0,.7)}
.proj h3{margin:0 0 6px;font-size:1.02rem;font-weight:660;display:flex;align-items:center;gap:7px}
.proj h3 a{color:var(--ink)}
.proj:hover h3 a{color:var(--accent-ink)}
.proj h3 .arw{color:var(--muted);transition:transform .2s}
.proj:hover h3 .arw{transform:translate(2px,-2px);color:var(--accent-ink)}
.proj p{margin:0;color:var(--muted);font-size:.9rem;line-height:1.55}

/* ---------- learning / courses ---------- */
.teach-intro{color:var(--ink-2);margin:0 0 20px;font-size:.98rem;max-width:66ch}
.courses{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:640px){.courses{grid-template-columns:1fr}}
a.course{display:flex;flex-direction:column;gap:8px;background:var(--surface);border:1px solid var(--hair);
  border-radius:14px;padding:18px 20px;box-shadow:0 1px 2px rgba(20,23,28,.04);
  transition:transform .2s,border-color .2s,box-shadow .25s}
a.course:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--accent) 42%,var(--hair));
  box-shadow:0 14px 30px -16px rgba(20,23,28,.28)}
:root[data-theme="dark"] a.course:hover{box-shadow:0 16px 32px -18px rgba(0,0,0,.7)}
.course-top{display:flex;align-items:center;gap:10px}
.course h3{margin:0;font-size:1.06rem;font-weight:640;letter-spacing:-.015em;color:var(--ink)}
a.course:hover h3{color:var(--accent-ink)}
.course .arw{margin-left:auto;color:var(--muted);transition:transform .2s,color .2s}
a.course:hover .arw{transform:translate(2px,-2px);color:var(--accent-ink)}
.course p{margin:0;color:var(--muted);font-size:.9rem;line-height:1.5}

/* ---------- writing list (cards, Chirpy-style) ---------- */
.writing{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:16px}
.writing li{background:var(--surface);border:1px solid var(--hair);border-radius:14px;padding:22px 24px;
  box-shadow:0 1px 2px rgba(20,23,28,.04);transition:transform .2s,border-color .2s,box-shadow .25s}
.writing li:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--accent) 42%,var(--hair));
  box-shadow:0 16px 32px -18px rgba(20,23,28,.28)}
:root[data-theme="dark"] .writing li:hover{box-shadow:0 18px 34px -20px rgba(0,0,0,.7)}
.writing a.wl{display:block}
.writing .wtitle{display:block;font-family:var(--serif);font-size:1.42rem;font-weight:600;letter-spacing:-.01em;
  color:var(--ink);line-height:1.25}
.writing a.wl:hover .wtitle{color:var(--accent-ink)}
.writing .wsum{margin:8px 0 14px;color:var(--muted);font-size:.96rem;line-height:1.55}
.writing .wmeta{display:flex;align-items:center;gap:16px;font-size:.8rem;color:var(--muted)}
.writing .wdate{font-family:var(--sans);letter-spacing:.01em}
.writing .cat{font-family:var(--sans);font-weight:600;color:var(--accent-ink)}
.more{display:inline-flex;align-items:center;gap:6px;margin-top:18px;font-family:var(--sans);
  font-size:.85rem;font-weight:600;color:var(--accent-ink);transition:gap .2s}
.more:hover{gap:10px}
.more svg{width:15px;height:15px}

/* tutorials list */
.tut-list{list-style:none;margin:6px 0 0;padding:0;display:flex;flex-direction:column;gap:12px}
.tut-list a{display:flex;align-items:center;justify-content:space-between;gap:16px;
  background:var(--surface);border:1px solid var(--hair);border-radius:12px;padding:18px 22px;
  font-family:var(--serif);font-size:1.2rem;font-weight:600;letter-spacing:-.01em;color:var(--ink);
  box-shadow:0 1px 2px rgba(20,23,28,.04);transition:transform .2s,border-color .2s,box-shadow .25s}
.tut-list a:hover{transform:translateX(4px);border-color:color-mix(in srgb,var(--accent) 42%,var(--hair));color:var(--accent-ink)}
.tut-list a .ar{flex:0 0 auto;color:var(--muted);transition:transform .2s,color .2s}
.tut-list a:hover .ar{transform:translateX(3px);color:var(--accent-ink)}
.tut-list a .ar svg{width:18px;height:18px;display:block}

/* ---------- page head (blog etc.) ---------- */
.page-head{margin-bottom:8px}
.page-head .kicker{font-family:var(--mono);font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent-ink)}
.page-head h1{font-family:var(--serif);font-size:clamp(2rem,5vw,2.6rem);letter-spacing:-.02em;font-weight:600;margin:10px 0 8px;color:var(--ink)}
.page-head p{color:var(--muted);max-width:60ch;margin:0}
.page-head .more{margin-top:0;margin-bottom:14px}
.filters{display:flex;flex-wrap:wrap;gap:8px;margin:22px 0 20px}
.filters button{font-family:var(--sans);font-size:.78rem;font-weight:600;color:var(--muted);background:transparent;
  border:1px solid var(--hair);border-radius:100px;padding:5px 13px;cursor:pointer;transition:.18s}
.filters button:hover{color:var(--ink);border-color:var(--accent)}
.filters button.on{color:#fff;background:var(--accent);border-color:var(--accent)}
:root[data-theme="dark"] .filters button.on{color:#0E1116}
@media (prefers-color-scheme:dark){.filters button.on{color:#0E1116}}

/* ---------- footer ---------- */
footer.site{border-top:1px solid var(--hair);margin-top:20px;padding:26px 0 0;color:var(--muted);font-size:.82rem;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}

/* reveal */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .6s ease,transform .6s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

/* ============================================================
   ARTICLE / POST
   ============================================================ */
.progress{position:fixed;top:0;left:var(--side);right:0;height:2.5px;background:var(--accent);width:0;z-index:60}
article{max-width:var(--readw);margin:0 auto;padding:20px 0 20px;font-family:var(--serif);font-size:18px;line-height:1.7}
.eyebrow{display:flex;align-items:center;gap:12px;font-family:var(--sans);margin-bottom:18px;flex-wrap:wrap}
.eyebrow .cat{font-size:.72rem;font-weight:700;color:var(--accent-ink);background:var(--accent-soft);border-radius:100px;padding:4px 12px}
.eyebrow .meta{font-family:var(--mono);font-size:.68rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
h1.post{font-family:var(--serif);font-size:clamp(2rem,5vw,2.7rem);line-height:1.12;letter-spacing:-.02em;
  font-weight:600;margin:0 0 16px;text-wrap:balance;color:var(--ink)}
.post-rule{height:1px;background:var(--hair);margin:26px 0 32px}
.post-body{font-family:var(--serif)}
.post-body p{margin:0 0 22px;color:var(--ink-2)}
.post-body h1{font-family:var(--sans);font-size:1.7rem;font-weight:700;letter-spacing:-.02em;margin:46px 0 14px;line-height:1.2;color:var(--ink)}
.post-body h2{font-family:var(--sans);font-size:1.5rem;font-weight:680;letter-spacing:-.02em;margin:44px 0 14px;line-height:1.2;color:var(--ink)}
.post-body h3{font-family:var(--sans);font-size:1.18rem;font-weight:660;letter-spacing:-.01em;margin:36px 0 12px;color:var(--ink)}
.post-body h4{font-family:var(--sans);font-size:1.02rem;font-weight:660;margin:28px 0 10px;color:var(--ink)}
.post-body ul,.post-body ol{margin:0 0 22px;padding-left:22px;color:var(--ink-2)}
.post-body li{margin:0 0 8px}
.post-body li>ul,.post-body li>ol{margin:8px 0 0}
.post-body img{max-width:100%;height:auto;margin:8px auto 10px;border-radius:12px;border:1px solid var(--hair)}
.post-body em{font-style:italic}
.post-body strong{color:var(--ink);font-weight:640}
.post-body a{color:var(--accent-ink);border-bottom:1px solid color-mix(in srgb,var(--accent) 35%,transparent)}
.post-body a:hover{border-bottom-color:var(--accent)}
.post-body blockquote{margin:0 0 22px;padding:2px 18px;border-left:3px solid var(--accent);
  background:var(--surface);border-radius:0 10px 10px 0;color:var(--ink-2)}
.post-body blockquote p:last-child{margin-bottom:0}
.post-body code{font-family:var(--mono);font-size:.86em;background:var(--code-bg);color:var(--code-ink);padding:2px 6px;border-radius:5px}
.post-body pre{background:var(--code-bg);border:1px solid var(--hair);border-radius:12px;padding:18px 20px;overflow-x:auto;margin:0 0 22px}
.post-body pre code{background:none;padding:0;font-size:.82rem;line-height:1.6;color:inherit}
.post-body hr{border:0;border-top:1px solid var(--hair);margin:34px 0}
.post-body table{width:100%;border-collapse:collapse;margin:0 0 22px;font-family:var(--sans);font-size:.92rem}
.post-body th,.post-body td{border:1px solid var(--hair);padding:8px 12px;text-align:left}
.katex-display{overflow-x:auto;overflow-y:hidden;padding:4px 0}
.post-foot{max-width:var(--readw);margin:40px auto 0}
.post-foot .card{background:var(--surface);border:1px solid var(--hair);border-radius:14px;padding:18px 20px;display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.post-foot img{width:52px;height:52px;border-radius:50%;object-fit:cover;border:1px solid var(--hair)}
.post-foot .n{font-family:var(--sans)}
.post-foot .n b{font-weight:680;letter-spacing:-.01em;color:var(--ink)}
.post-foot .n span{color:var(--muted);font-size:.88rem}
.post-foot .to-all{margin-left:auto;font-family:var(--sans);font-size:.85rem;font-weight:600;color:var(--accent-ink)}
.loading{color:var(--muted);font-family:var(--sans)}

/* ---------- CV page ---------- */
.contactbar{display:flex;flex-wrap:wrap;align-items:center;gap:10px 18px;font-family:var(--sans);
  font-size:.9rem;color:var(--muted);margin:6px 0 22px}
.contactbar a{color:var(--accent-ink)}
.contactbar .sep{color:var(--hair)}
.btn{display:inline-flex;align-items:center;gap:8px;font-family:var(--sans);font-size:.85rem;font-weight:600;
  padding:9px 16px;border-radius:9px;border:1px solid var(--accent);background:var(--accent);color:#fff;transition:.18s}
.btn:hover{filter:brightness(1.06);transform:translateY(-1px)}
.btn svg{width:16px;height:16px}
:root[data-theme="dark"] .btn{color:#0E1116}
@media (prefers-color-scheme:dark){.btn{color:#0E1116}}
.cv-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:6px}
.cv-head h1{font-family:var(--serif);font-size:clamp(2rem,4.5vw,2.6rem);font-weight:600;letter-spacing:-.02em;margin:0;color:var(--ink)}
.skillrow{display:grid;grid-template-columns:190px 1fr;gap:18px;padding:12px 0;border-bottom:1px solid var(--hair-2)}
.skillrow:last-child{border-bottom:0}
.skillrow .k{font-family:var(--sans);font-size:.8rem;font-weight:700;letter-spacing:.02em;color:var(--muted);text-transform:uppercase;padding-top:2px}
.skillrow .v{color:var(--ink-2)}
@media(max-width:520px){.skillrow{grid-template-columns:1fr;gap:3px}}
.simplelist{list-style:none;margin:0;padding:0}
.simplelist li{display:grid;grid-template-columns:1fr auto;gap:14px;align-items:baseline;padding:11px 0;border-bottom:1px solid var(--hair-2)}
.simplelist li:last-child{border-bottom:0}
.simplelist .t{color:var(--ink-2)}
.simplelist .t b{color:var(--ink);font-weight:640}
.simplelist .src{font-family:var(--sans);font-size:.82rem;font-weight:600;color:var(--accent-ink);white-space:nowrap}
@media(max-width:520px){.simplelist li{grid-template-columns:1fr}}

/* ============================================================
   RESPONSIVE — sidebar collapses to a top bar
   ============================================================ */
@media(max-width:1080px){
  .main-wrap{grid-template-columns:1fr}
  .rail{position:static;flex-direction:row;flex-wrap:wrap;gap:26px 44px;margin-top:8px;
    padding-top:26px;border-top:1px solid var(--hair)}
  .rail .rail-box{flex:1 1 220px}
}
@media(max-width:860px){
  :root{--side:0px}
  body{flex-direction:column}
  .sidebar{flex:0 0 auto;position:static;align-self:auto;width:auto;height:auto;flex-direction:column;
    padding:26px 20px;border-right:0;border-bottom:1px solid var(--hair)}
  .brand .avatar{width:88px;height:88px}
  .snav{flex-direction:row;flex-wrap:wrap;justify-content:center;gap:4px;margin-top:20px}
  .snav a{padding:9px 12px}
  .sidebar-foot{margin-top:20px}
  .progress{left:0}
}

@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none}
}