/* raviteja2k2k.github.io — one stylesheet, system fonts only, no third-party requests. */
:root{
  --bg:#F3F6F7; --surface:#FFFFFF; --fg:#13232B; --muted:#4F6068; --line:#D3DDE1;
  --teal:#0B5F65; --mark:#8C600A; --mark-soft:#F6E7C8; --teal-soft:#DCEDEE;
  --display:"Iowan Old Style","Palatino Linotype",Palatino,"Book Antiqua",Georgia,serif;
  --body:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,"SFMono-Regular","Cascadia Mono",Menlo,Consolas,monospace;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0D171C; --surface:#13222A; --fg:#E4EDF0; --muted:#A3B4BB; --line:#25363E;
  --teal:#6FD0D4; --mark:#E8B654; --mark-soft:#3A2E14; --teal-soft:#123338; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0D171C; --surface:#13222A; --fg:#E4EDF0; --muted:#A3B4BB; --line:#25363E;
  --teal:#6FD0D4; --mark:#E8B654; --mark-soft:#3A2E14; --teal-soft:#123338; color-scheme:dark}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:400 1rem/1.65 var(--body);padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
a{color:var(--teal);text-underline-offset:2px}
a:focus-visible,button:focus-visible{outline:2px solid var(--mark);outline-offset:2px}
.skip{position:absolute;left:-999px;top:8px;background:var(--surface);padding:8px 12px;border-radius:4px;z-index:2}
.skip:focus{left:16px}
img,svg{max-width:100%;height:auto}

/* top bar */
.bar{max-width:980px;margin:0 auto;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 20px;padding:18px 0;border-bottom:1px solid var(--line)}
.brand{font:600 1.05rem/1.2 var(--display);color:var(--fg);text-decoration:none}
.nav{display:flex;flex-wrap:wrap;gap:4px 18px;font-size:.92rem}
.nav a{color:var(--muted);text-decoration:none;padding:4px 0}
.nav a[aria-current="page"],.nav a:hover{color:var(--teal);text-decoration:underline}

main.wrap{max-width:760px;margin:0 auto;padding-block:44px 64px;display:flex;flex-direction:column;gap:56px}
.wide{max-width:980px;width:100%;margin-inline:auto}
h1,h2,h3{font-family:var(--display);font-weight:600;line-height:1.15;text-wrap:balance;margin:0}
h1{font-size:clamp(2rem,5.2vw,3.1rem)}
h2{font-size:1.65rem}
h3{font-size:1.08rem;font-family:var(--body);font-weight:600;line-height:1.3}
p{margin:0}
section,header.hero{display:flex;flex-direction:column;gap:16px}
.eyebrow{font:500 .74rem/1.4 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--teal)}
.lede{font-size:1.15rem;max-width:62ch}
.meta{display:flex;flex-wrap:wrap;gap:6px 20px;font:400 .85rem/1.5 var(--mono);color:var(--muted)}
.meta b{color:var(--fg);font-weight:600}
.prose{display:flex;flex-direction:column;gap:14px;max-width:65ch}
.muted{color:var(--muted)}
.note{font-size:.82rem;color:var(--muted)}

/* buttons */
.cta{display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.btn{display:inline-block;padding:10px 16px;border-radius:4px;background:var(--teal);color:var(--bg);text-decoration:none;font-weight:600;font-size:.92rem}
.btn.ghost{background:transparent;color:var(--teal);border:1px solid var(--teal)}
.copy{font:500 .82rem var(--mono);background:transparent;border:1px solid var(--line);color:var(--fg);border-radius:4px;padding:8px 10px;cursor:pointer}

/* figures band */
.figs{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.fig{padding:18px 16px;display:flex;flex-direction:column;gap:4px;border-right:1px solid var(--line);min-width:0}
.fig:last-child{border-right:0}
.fig .n{font:600 1.7rem/1.1 var(--mono);font-variant-numeric:tabular-nums}
.fig .l{font-size:.84rem;color:var(--muted)}
@media (max-width:700px){.figs{grid-template-columns:repeat(2,minmax(0,1fr))}.fig:nth-child(2n){border-right:0}.fig:nth-child(-n+2){border-bottom:1px solid var(--line)}}

/* cards */
.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
@media (max-width:700px){.cards{grid-template-columns:1fr}}
.card{background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:18px;display:flex;flex-direction:column;gap:8px;min-width:0}
.card.lead{grid-column:1/-1;border-color:var(--teal)}
.card p{font-size:.93rem;color:var(--muted)}
.card ul{margin:0;padding-left:18px;font-size:.92rem;display:flex;flex-direction:column;gap:4px}
.card .links{display:flex;flex-wrap:wrap;gap:6px 16px;font-size:.9rem;margin-top:auto;padding-top:4px}
.tag{align-self:flex-start;font:500 .7rem/1 var(--mono);letter-spacing:.08em;text-transform:uppercase;padding:5px 8px;border-radius:3px;background:var(--teal-soft);color:var(--teal)}
.tag.amber{background:var(--mark-soft);color:var(--fg)}

.cols3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
@media (max-width:760px){.cols3{grid-template-columns:1fr}}
.cols3 h3{margin-bottom:6px}
.cols3 p{font-size:.93rem;color:var(--muted)}
.two{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}
@media (max-width:700px){.two{grid-template-columns:1fr}}

.chips{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:0;padding:0}
.chips li{font:400 .8rem/1 var(--mono);border:1px solid var(--line);border-radius:999px;padding:7px 11px}

ul.ticks{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px;max-width:68ch}
ul.ticks li{padding-left:22px;position:relative}
ul.ticks li::before{content:"";position:absolute;left:2px;top:.62em;width:9px;height:9px;border:2px solid var(--teal);border-radius:50%}

/* flow */
.flow{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px;list-style:none;margin:0;padding:0}
.flow li{background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:14px;display:flex;flex-direction:column;gap:6px;min-width:0}
.flow .k{font:500 .72rem/1 var(--mono);color:var(--mark);letter-spacing:.08em}
.flow p{font-size:.86rem;color:var(--muted);line-height:1.5}
@media (max-width:860px){.flow{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:460px){.flow{grid-template-columns:1fr}}

/* tables */
.tbl-wrap{overflow-x:auto}
table{border-collapse:collapse;width:100%;font-size:.92rem}
th,td{text-align:left;padding:9px 10px 9px 0;border-bottom:1px solid var(--line);vertical-align:top}
th{font:500 .74rem/1.4 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
td.num{font-family:var(--mono);font-variant-numeric:tabular-nums;white-space:nowrap}

/* chart */
.chart{background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:20px;display:flex;flex-direction:column;gap:14px}
.bar-row{display:grid;grid-template-columns:110px 1fr 90px;align-items:center;gap:12px;font-size:.88rem}
.track{height:22px;background:var(--teal-soft);border-radius:3px;overflow:hidden}
.fill{height:100%;background:var(--teal)}
.fill.after{background:var(--mark)}
.bar-row .v{font:600 .9rem var(--mono);text-align:right}
@media (max-width:460px){.bar-row{grid-template-columns:76px 1fr 70px}}

/* timeline */
.timeline{display:grid;grid-template-columns:150px 1fr;gap:10px 18px;margin:0;font-size:.94rem}
.timeline dt{font:500 .82rem/1.6 var(--mono);color:var(--teal)}
.timeline dd{margin:0}
.timeline dd b{font-weight:600}
@media (max-width:520px){.timeline{grid-template-columns:1fr;gap:2px}.timeline dd{margin-bottom:10px}}

.lesson{border-left:3px solid var(--mark);padding:2px 0 2px 14px;display:flex;flex-direction:column;gap:4px}
.lesson q{font-family:var(--display);font-size:1.12rem;font-weight:600;quotes:none}
.lesson p{font-size:.9rem;color:var(--muted)}

.bridge{background:var(--mark-soft);border-radius:6px;padding:22px;display:flex;flex-direction:column;gap:10px}

footer.foot{max-width:980px;margin:0 auto;border-top:1px solid var(--line);padding:22px 0 40px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;font-size:.88rem;color:var(--muted)}
footer.foot nav{display:flex;flex-wrap:wrap;gap:6px 14px}

@media print{.bar nav,.cta,.copy{display:none}body{background:#fff;color:#000}}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
.sr-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
@media (max-width:560px){
  table thead{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
  table tr{display:block;border-bottom:1px solid var(--line);padding:8px 0}
  table td{display:block;border:0;padding:2px 0}
  td.num{white-space:normal;color:var(--teal)}
}

.card.demo{text-decoration:none;color:inherit;transition:border-color .15s}.card.demo:hover{border-color:var(--teal)}.card.demo img{width:100%;height:auto;border-radius:4px;border:1px solid var(--line)}.card.demo h3{color:var(--teal)}.lede-sm{color:var(--muted);margin:-4px 0 14px;font-size:.95rem}
@media (prefers-reduced-motion:reduce){.card.demo{transition:none}}