/* Khizr Iqbal — personal site
   Palette: ledger paper, blue-ink, ledger-rule green, blue-pencil annotations */
:root{
  --paper:#F3F5F0; --surface:#FFFFFF; --ink:#13212B; --muted:#55666F;
  --rule:#C9D8CF; --rule-strong:#9DB8A8; --pencil:#2F5BD3; --pencil-soft:#E3EAFB;
  --ok:#1F7A4D; --err:#B3261E;
  --sans:"Source Sans 3",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --serif:"Newsreader",Georgia,"Times New Roman",serif;
  --measure:66ch; --wrap:1120px;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root{
    --paper:#0F1A21; --surface:#16242D; --ink:#E6ECEA; --muted:#9FB0B5;
    --rule:#243A33; --rule-strong:#3B5E50; --pencil:#8FB0FF; --pencil-soft:#1D2C48;
    --ok:#5FD19B; --err:#FF8A80; color-scheme:dark;
  }
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:5rem}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);
  font-size:1.125rem;line-height:1.65;font-optical-sizing:auto}
img{max-width:100%;height:auto;display:block}
a{color:var(--pencil);text-underline-offset:.18em;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--pencil);outline-offset:3px;border-radius:3px}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:var(--paper);padding:.6rem 1rem;z-index:100}
.skip:focus{left:1rem;top:1rem}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 1.5rem}

/* Type scale (1.25) */
h1,h2,h3{font-family:var(--serif);line-height:1.12;letter-spacing:-.01em;margin:0 0 .6em;font-weight:500}
h1{font-size:clamp(2.3rem,5.4vw,4rem);letter-spacing:-.02em;font-weight:500}
h2{font-size:clamp(1.6rem,3vw,2.2rem)}
h3{font-size:1.3rem;font-weight:600}
p{margin:0 0 1.1em;max-width:var(--measure)}
.lede{font-size:clamp(1.2rem,2vw,1.4rem);line-height:1.55;color:var(--muted)}
.small{font-size:.95rem;color:var(--muted)}

/* Header */
.site-header{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--paper) 92%,transparent);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-bottom:1px solid var(--rule)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:4.25rem}
.brand{font-family:var(--serif);font-weight:600;font-size:1.25rem;color:var(--ink);text-decoration:none;letter-spacing:-.01em}
.brand span{color:var(--muted);font-weight:500}
.nav-links{display:flex;gap:1.6rem;list-style:none;margin:0;padding:0;font-family:var(--sans);font-size:.98rem}
.nav-links a{color:var(--ink);text-decoration:none;padding:.3rem 0;border-bottom:2px solid transparent}
.nav-links a:hover,.nav-links a[aria-current="page"]{border-bottom-color:var(--pencil)}
.nav-toggle{display:none;background:none;border:1px solid var(--rule-strong);color:var(--ink);
  font:600 .95rem var(--sans);padding:.45rem .8rem;border-radius:6px;cursor:pointer}
@media (max-width:820px){
  .nav-toggle{display:block}
  .nav-links{display:none;position:absolute;left:0;right:0;top:100%;flex-direction:column;gap:0;
    background:var(--paper);border-bottom:1px solid var(--rule);padding:.5rem 1.5rem 1rem}
  .nav-links.open{display:flex}
  .nav-links a{display:block;padding:.75rem 0;border-bottom:1px solid var(--rule)}
}

/* Buttons */
.btn{display:inline-block;font:600 1rem var(--sans);text-decoration:none;padding:.85rem 1.35rem;
  border-radius:6px;border:1.5px solid var(--ink);color:var(--ink);background:transparent;cursor:pointer;line-height:1.2}
.btn-primary{background:var(--ink);color:var(--paper)}
.btn:hover{background:var(--pencil);border-color:var(--pencil);color:#fff}
.actions{display:flex;flex-wrap:wrap;gap:.8rem;margin-top:1.8rem}

/* Sections */
main{display:block}
.section{padding:clamp(3.5rem,8vw,6rem) 0;border-top:1px solid var(--rule)}
.section:first-child{border-top:0}
.page-head{padding:clamp(3rem,7vw,5rem) 0 1rem}
.page-head h1{max-width:20ch}

/* Hero */
.hero{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(2rem,5vw,4.5rem);align-items:center;
  padding:clamp(3rem,7vw,5.5rem) 0}
.hero h1{max-width:17ch;font-size:clamp(2.2rem,4.6vw,3.5rem)}
@media (max-width:900px){.hero{grid-template-columns:1fr}}

/* The ledger — the one memorable element */
.ledger{background:var(--surface);border:1px solid var(--rule-strong);border-radius:4px;
  padding:1.4rem 1.4rem 1rem;position:relative}
.ledger-head{display:flex;justify-content:space-between;align-items:baseline;font-family:var(--sans);
  font-size:.9rem;color:var(--muted);padding-bottom:.9rem;border-bottom:2px solid var(--ink);margin-bottom:.2rem}
.ledger-head strong{color:var(--ink);font-size:1rem}
.row{display:grid;grid-template-columns:1fr auto;gap:.3rem 1rem;padding:.75rem 0;border-bottom:1px solid var(--rule)}
.row:last-of-type{border-bottom:0}
.row .label{font-family:var(--sans);font-size:1rem}
.row .val{font-family:var(--sans);font-variant-numeric:tabular-nums;font-weight:600;text-align:right;position:relative;padding-right:1.3rem}
.row .val::after{content:"";position:absolute;right:.2rem;top:.2rem;width:.38rem;height:.75rem;
  border-right:2px solid var(--pencil);border-bottom:2px solid var(--pencil);transform:rotate(40deg);opacity:0}
.note{grid-column:1/-1;font-family:var(--serif);font-style:italic;color:var(--pencil);font-size:1rem;line-height:1.45;
  padding-left:.9rem;border-left:2px solid var(--pencil);margin-top:.25rem;opacity:0;transform:translateY(4px)}
.ledger-foot{font-family:var(--sans);font-size:.82rem;color:var(--muted);margin:.8rem 0 0}
.ledger.done .note,.no-js .note{opacity:1;transform:none;transition:opacity .5s ease,transform .5s ease}
.ledger.done .val::after,.no-js .val::after{opacity:1;transition:opacity .3s ease}
.ledger.done .row:nth-of-type(3) .note,.ledger.done .row:nth-of-type(3) .val::after{transition-delay:.6s}
.ledger.done .row:nth-of-type(4) .note,.ledger.done .row:nth-of-type(4) .val::after{transition-delay:1.2s}
.ledger.done .row:nth-of-type(5) .note,.ledger.done .row:nth-of-type(5) .val::after{transition-delay:1.8s}
@media (prefers-reduced-motion:reduce){
  .note,.row .val::after{opacity:1!important;transform:none!important;transition:none!important}
}

/* Proof list */
.proof{display:grid;grid-template-columns:repeat(3,1fr);gap:2rem;margin-top:2rem}
.proof div{border-top:2px solid var(--ink);padding-top:1rem}
.proof h3{margin-bottom:.4rem}
.proof p{color:var(--muted);font-size:1.02rem;margin:0}
@media (max-width:820px){.proof{grid-template-columns:1fr;gap:1.5rem}}

/* Split layout */
.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.6fr);gap:clamp(1.5rem,5vw,4rem)}
@media (max-width:820px){.split{grid-template-columns:1fr}}

/* Timeline (real sequence) */
.timeline{list-style:none;margin:0;padding:0}
.timeline li{display:grid;grid-template-columns:8.5rem 1fr;gap:1rem;padding:1.1rem 0;border-bottom:1px solid var(--rule)}
.timeline .when{font-family:var(--sans);font-variant-numeric:tabular-nums;color:var(--muted);font-size:.95rem;padding-top:.15rem}
.timeline h3{margin:0 0 .2rem;font-size:1.1rem}
.timeline p{margin:0;color:var(--muted);font-size:1rem}
@media (max-width:560px){.timeline li{grid-template-columns:1fr;gap:.2rem}}

/* Portrait */
.portrait{width:100%;max-width:320px;aspect-ratio:4/5;border-radius:4px;border:1px solid var(--rule-strong);
  background:var(--surface);display:grid;place-items:center;overflow:hidden}
.portrait img{width:100%;height:100%;object-fit:cover}
.portrait .mono{font:700 4rem var(--sans);color:var(--rule-strong);letter-spacing:-.04em}

/* Modules */
.modules{list-style:none;padding:0;margin:1.5rem 0 0;display:grid;grid-template-columns:repeat(2,1fr);gap:0 2.5rem}
.modules li{padding:1.1rem 0;border-top:1px solid var(--rule)}
.modules h3{margin:0 0 .3rem;font-size:1.1rem}
.modules p{margin:0;color:var(--muted);font-size:1rem}
@media (max-width:700px){.modules{grid-template-columns:1fr}}

/* Callout */
.callout{background:var(--surface);border:1px solid var(--rule-strong);border-left:4px solid var(--pencil);
  padding:1.6rem 1.8rem;border-radius:4px;margin-top:2rem}
.callout h2,.callout h3{margin-top:0}
.callout p:last-child{margin-bottom:0}

/* Articles */
.post-list{list-style:none;padding:0;margin:0}
.post-list li{padding:1.4rem 0;border-bottom:1px solid var(--rule)}
.post-list a{font:500 1.4rem/1.25 var(--serif);color:var(--ink);text-decoration:none}
.post-list a:hover{color:var(--pencil)}
.post-list time{display:block;font-family:var(--sans);font-size:.9rem;color:var(--muted);margin-bottom:.3rem}
.post-list p{margin:.4rem 0 0;color:var(--muted)}
.planned li{color:var(--muted);padding:.5rem 0}
.article{max-width:var(--measure);margin:0 auto;padding:clamp(3rem,7vw,5rem) 0}
.article h1{font-size:clamp(2rem,4.5vw,3rem)}
.article h2{font-size:1.45rem;margin-top:2.2rem}
.article .meta{font-family:var(--sans);color:var(--muted);font-size:.95rem;margin-bottom:2rem}
.article blockquote{font-family:var(--serif);font-size:1.25rem;margin:1.8rem 0;padding-left:1.2rem;border-left:2px solid var(--pencil);font-style:italic;color:var(--pencil)}

/* Forms */
form{max-width:640px}
fieldset{border:0;padding:0;margin:0 0 1.5rem}
legend{font:600 1rem var(--sans);margin-bottom:.6rem}
.choices{display:flex;flex-wrap:wrap;gap:.6rem}
.choice input{position:absolute;opacity:0;pointer-events:none}
.choice span{display:inline-block;font:500 .98rem var(--sans);padding:.6rem 1rem;border:1.5px solid var(--rule-strong);border-radius:6px;cursor:pointer}
.choice input:checked + span{border-color:var(--pencil);background:var(--pencil-soft);color:var(--ink)}
.choice input:focus-visible + span{outline:3px solid var(--pencil);outline-offset:2px}
.field{margin-bottom:1.2rem}
label{display:block;font:600 .98rem var(--sans);margin-bottom:.4rem}
.optional{font-weight:400;color:var(--muted)}
input[type=text],input[type=email],textarea{width:100%;font:1.05rem var(--sans);color:var(--ink);background:var(--surface);
  border:1.5px solid var(--rule-strong);border-radius:6px;padding:.75rem .85rem}
input:focus,textarea:focus{outline:none;border-color:var(--pencil);box-shadow:0 0 0 3px var(--pencil-soft)}
textarea{min-height:9rem;resize:vertical}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.error-text{color:var(--err);font:500 .92rem var(--sans);margin-top:.35rem;display:none}
.field.invalid input,.field.invalid textarea{border-color:var(--err)}
.field.invalid .error-text{display:block}
.status{font-family:var(--sans);padding:1rem 1.2rem;border-radius:6px;margin-bottom:1.5rem;display:none;max-width:640px}
.status.show{display:block}
.status.ok{border:1.5px solid var(--ok);color:var(--ok)}
.status.err{border:1.5px solid var(--err);color:var(--err)}

/* Footer */
.site-footer{border-top:1px solid var(--rule);padding:2.5rem 0 3rem;font-family:var(--sans);font-size:.95rem;color:var(--muted)}
.foot{display:flex;flex-wrap:wrap;justify-content:space-between;gap:1rem}
.foot ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:1.2rem}
.foot a{color:var(--muted)}
.foot a:hover{color:var(--ink)}

/* About header: small photo beside the headline */
.about-head{display:grid;grid-template-columns:160px minmax(0,1fr);gap:clamp(1.5rem,4vw,2.75rem);align-items:start}
.about-head .portrait{max-width:160px;aspect-ratio:1/1;margin-top:.5rem}
@media (max-width:640px){.about-head{grid-template-columns:1fr}.about-head .portrait{max-width:112px;margin-top:0}}

/* Illustrated version: columnar-pad background behind page headers */
body{overflow-x:clip}
.hero,.page-head{position:relative}
.hero::before,.page-head::before{content:"";position:absolute;top:0;bottom:0;left:calc(50% - 50vw);right:calc(50% - 50vw);z-index:-1;pointer-events:none;
  background-image:
    repeating-linear-gradient(to right,transparent 0 calc(7.5rem - 1px),color-mix(in srgb,var(--rule) 60%,transparent) calc(7.5rem - 1px) 7.5rem),
    repeating-linear-gradient(to bottom,transparent 0 calc(2rem - 1px),color-mix(in srgb,var(--rule) 35%,transparent) calc(2rem - 1px) 2rem);
  -webkit-mask-image:linear-gradient(to bottom,#000 0%,#000 45%,transparent 100%);mask-image:linear-gradient(to bottom,#000 0%,#000 45%,transparent 100%)}

/* Illustrated version: tagline illustrations on the About page */
.tagline-art{padding-bottom:clamp(3rem,6vw,4.5rem)}
.art-grid{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(1.25rem,3vw,2.25rem)}
@media (max-width:860px){.art-grid{grid-template-columns:1fr;max-width:460px}}
.art{margin:0}
.art svg{display:block;width:100%;height:auto;background:var(--paper);border-top:2px solid var(--ink);padding-top:.75rem}
.art figcaption{margin-top:.9rem}
.art h3{margin:0 0 .3rem}
.art p{margin:0;color:var(--muted);font-size:1rem}
.art .sheet{fill:var(--surface);stroke:var(--rule-strong);stroke-width:1}
.art .ink{stroke:var(--ink);fill:none;stroke-linecap:round;stroke-linejoin:round}
.art .rl{stroke:var(--rule);stroke-width:1}
.art .lbl{stroke:var(--rule-strong);stroke-width:4;stroke-linecap:round}
.art .pen{stroke:var(--pencil);stroke-width:1.7;fill:none;stroke-linecap:round;stroke-linejoin:round}
.art .dash{stroke-width:2;stroke-dasharray:5 5}
.art .dot{fill:var(--ink)}
.art text{font-family:var(--sans)}
.art .t-head{font-size:11px;font-weight:600;fill:var(--ink)}
.art .t-num{font-size:12px;font-weight:600;fill:var(--ink);font-variant-numeric:tabular-nums}
.art .t-bold{font-weight:700}
.art .t-small{font-size:10px;fill:var(--muted)}
.art .t-pen{font-family:var(--serif);font-style:italic;font-size:12px;fill:var(--pencil)}
.art .t-quote{font-family:var(--serif);font-style:italic;font-size:16px;fill:var(--ink)}
.art .t-stamp{font-size:10px;font-weight:600;fill:var(--pencil)}

/* Font option: franklin */
:root{--serif:"Libre Franklin",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;--sans:"Libre Franklin",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
body{font-size:1.0625rem}
h1,h2,h3{font-weight:600;letter-spacing:-.02em}
h1{font-weight:700;letter-spacing:-.035em}
.hero h1{font-size:clamp(2.1rem,4.3vw,3.25rem)}
.brand{font-weight:700;letter-spacing:-.01em}

h1,h2{text-wrap:balance}

/* Header wordmark: "Khizr Iqbal" folds into "KI" once the page is scrolled */
.brand .bw{display:inline-flex;white-space:nowrap}
.brand span.bw,.brand .bw span{color:inherit;font-weight:inherit}
.brand .bk,.brand .bl{display:inline-block;overflow:hidden;vertical-align:top;line-height:1.25}
.brand .bl{max-width:var(--w,none);transition:max-width .26s cubic-bezier(.3,.7,.3,1),opacity .2s ease;transition-delay:calc(var(--de)*45ms)}
.brand.mini .bl{max-width:0;opacity:0;transition-delay:calc(var(--dc)*45ms)}
.brand.mini .bsp{max-width:0}
@media (prefers-reduced-motion:reduce){.brand .bl{transition:none}}