/* Bharath Kumar Bahunuthula — shared styles
   Palette and type carried over from the existing site. */
:root{
  --paper:#F3F0E7; --panel:#EDE9DD; --ink:#211F1C; --ink-soft:#4A473F; --muted:#6B665A;
  --pine:#3B5249; --clay:#A9633B; --line:#DAD5C6;
  --own-bg:#E9F0EC; --own-fg:#2F5142; --own-bd:#C3D8CC;
  --fam-bg:#FBF2E4; --fam-fg:#8A5A22; --fam-bd:#EFD9B4;
  --study-bg:#E8EDF3; --study-fg:#36506E; --study-bd:#C5D1E0;
  --none-bg:#F1EEE7; --none-fg:#6B665A; --none-bd:#DDD8CB;
  --serif:'Newsreader',Georgia,serif;
  --sans:'Inter',system-ui,-apple-system,'Segoe UI',sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,Menlo,Consolas,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:88px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{background:var(--paper);color:var(--ink);font-family:var(--sans);line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:inherit}
::selection{background:var(--pine);color:var(--paper)}
:focus-visible{outline:2px solid var(--pine);outline-offset:3px}
img{max-width:100%;height:auto}

.skip-link{position:absolute;left:-9999px;top:8px;background:var(--ink);color:var(--paper);padding:10px 14px;z-index:100;border-radius:3px;font-size:14px}
.skip-link:focus{left:12px}
.wrap{max-width:920px;margin:0 auto;padding:0 32px}

/* ---------- header / nav ---------- */
.site-header{position:sticky;top:0;z-index:50;background:rgba(243,240,231,.95);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.header-inner{max-width:1040px;margin:0 auto;padding:16px 32px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px 24px}
.brand{font-family:var(--serif);font-style:italic;font-size:16px;text-decoration:none}
.site-nav ul{display:flex;flex-wrap:wrap;gap:4px 22px;list-style:none}
.site-nav a{font-family:var(--mono);font-size:12px;letter-spacing:.04em;text-transform:uppercase;text-decoration:none;color:var(--ink-soft);padding:4px 0;border-bottom:1px solid transparent}
.site-nav a:hover,.site-nav a[aria-current="page"]{color:var(--pine);border-bottom-color:var(--pine)}

/* ---------- hero ---------- */
.hero{padding:clamp(56px,10vh,112px) 0 56px}
.eyebrow{font-family:var(--mono);font-size:12.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--pine);margin-bottom:18px}
h1.hero-title{font-family:var(--serif);font-weight:500;font-size:clamp(40px,7vw,84px);line-height:1.02;letter-spacing:-.01em;max-width:900px}
h1 em{font-style:italic;font-weight:400;color:var(--pine)}
.hero-sub{margin-top:24px;max-width:600px;color:var(--ink-soft);font-size:18px}
.cred-strip{list-style:none;display:flex;flex-wrap:wrap;gap:10px;margin-top:36px;padding-top:28px;border-top:1px solid var(--line);max-width:760px}
.cred-item{font-size:12.5px;color:var(--ink-soft);background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:6px 14px}
.cred-item strong{color:var(--ink);font-weight:600}

/* ---------- story sections ---------- */
.story{padding:88px 0;border-top:1px solid var(--line)}
.section-head{display:flex;align-items:center;flex-wrap:wrap;gap:10px 14px;margin-bottom:22px}
.story-label{font-family:var(--sans);font-weight:500;font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--pine)}
.is-study .story-label{color:var(--study-fg)}
.story p{font-size:19px;color:var(--ink-soft);max-width:720px;margin-bottom:22px}
.story p strong{color:var(--ink);font-weight:500}
.story p.pull-quote{font-family:var(--serif);font-style:italic;font-weight:400;font-size:clamp(24px,3.4vw,34px);line-height:1.4;color:var(--ink);max-width:760px;margin:40px 0;padding-left:28px;border-left:2px solid var(--clay)}
.story p.note{font-size:15px;color:var(--ink-soft);border-left:2px solid var(--study-bd);padding-left:14px;max-width:680px}

.tag{display:inline-block;font-family:var(--mono);font-size:11px;font-weight:500;letter-spacing:.03em;padding:3px 9px;border-radius:3px;border:1px solid;white-space:nowrap}
.tag-prof{background:var(--own-bg);color:var(--own-fg);border-color:var(--own-bd)}
.tag-study{background:var(--study-bg);color:var(--study-fg);border-color:var(--study-bd)}
.tag-prop{background:var(--fam-bg);color:var(--fam-fg);border-color:var(--fam-bd)}

.topic-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px 32px;margin:10px 0 28px;max-width:840px}
.topic{border-top:1px dashed var(--study-bd);padding-top:12px}
.topic h3{font-family:var(--mono);font-size:11.5px;letter-spacing:.05em;text-transform:uppercase;color:var(--study-fg);font-weight:500;margin-bottom:6px}
.story .topic p{font-size:14.5px;line-height:1.55;margin:0;max-width:none}

/* ---------- engineering domains (map + drill-down) ---------- */
.key{display:flex;flex-wrap:wrap;gap:8px 22px;margin:26px 0 8px;font-family:var(--mono);font-size:12px;color:var(--ink-soft)}
.key span{display:inline-flex;align-items:center;gap:8px}
.swatch{width:26px;height:0;border-top:3px solid var(--pine);display:inline-block}
.swatch.study{border-top:3px dashed var(--study-fg)}
.dom-map{margin:30px 0 8px;max-width:860px}
.dom-card{display:block;text-decoration:none;color:inherit;background:var(--paper);border:1px solid var(--line);border-top:3px solid var(--pine);padding:16px 18px 18px;transition:border-color .15s,background .15s}
.dom-card:hover{background:#F8F6EF;border-color:var(--pine)}
.dom-card.study{border-top:3px dashed var(--study-fg);background:var(--study-bg)}
.dom-card.study:hover{border-color:var(--study-fg)}
.dom-num{display:block;font-family:var(--mono);font-size:11.5px;color:var(--muted)}
.dom-name{display:block;font-family:var(--serif);font-weight:600;font-size:20px;line-height:1.2;margin:3px 0 6px}
.dom-meta{display:block;font-family:var(--mono);font-size:11.5px;color:var(--ink-soft);line-height:1.5}
.dom-kind{display:block;font-family:var(--mono);font-size:11px;margin-top:8px;color:var(--own-fg)}
.dom-card.study .dom-kind{color:var(--study-fg)}
.dom-link{display:flex;flex-direction:column;align-items:center;margin:0;color:var(--muted);font-family:var(--mono);font-size:11px;text-align:center}
.dom-link::before{content:"";display:block;width:0;height:22px;border-left:1px solid var(--muted)}
.dom-link::after{content:"\2193";line-height:1;font-size:13px;margin:-2px 0 4px}
.dom-link.deep::before{border-left:1px dashed var(--study-fg);height:26px}
.dom-link.deep{color:var(--study-fg);padding:0 12px}
.dom-ecu{border:1px solid var(--line);padding:12px 14px 16px;background:var(--panel)}
.dom-ecu-label{font-family:var(--mono);font-size:11.5px;letter-spacing:.04em;text-transform:uppercase;color:var(--ink-soft);margin-bottom:12px}
.dom-branches{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.dom-semi{border:1px solid var(--study-bd);padding:12px 14px 14px;background:#F1F4F8}
.dom-semi>.dom-card{margin-bottom:12px;border-top:3px solid var(--pine)}
.dom-subs{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.dom-sub{padding:12px 12px 14px}
.dom-sub .dom-name{font-size:16px}
.dom-sub .dom-kind{margin-top:6px}
.dom-sub.mixed{border-top:3px solid var(--pine)}
.dom-caption{margin-top:14px;font-size:13.5px;color:var(--muted);max-width:700px}

details.dom{border-top:1px solid var(--line)}
.dom-panels{margin-top:34px;border-bottom:1px solid var(--line)}
details.dom>summary,details.sub>summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:12px;flex-wrap:wrap}
details.dom>summary::-webkit-details-marker,details.sub>summary::-webkit-details-marker{display:none}
details.dom>summary{padding:18px 4px}
details.dom>summary::before,details.sub>summary::before{content:"+";font-family:var(--mono);width:16px;color:var(--muted);flex:none}
details.dom[open]>summary::before,details.sub[open]>summary::before{content:"\2013"}
.sum-num{font-family:var(--mono);font-size:12.5px;color:var(--muted)}
.sum-title{font-family:var(--serif);font-weight:600;font-size:20px}
.sum-tags{display:flex;gap:8px;flex-wrap:wrap;margin-left:auto}
.dom-body{padding:4px 4px 30px 32px}
.story .dom-body p,.dom-body p{font-size:15.5px;line-height:1.6;color:var(--ink-soft);max-width:700px;margin:0 0 14px}
.dom-body .stage{margin-top:22px}
.dom-body h3{font-family:var(--mono);font-size:11.5px;letter-spacing:.05em;text-transform:uppercase;color:var(--pine);font-weight:500;margin-bottom:6px;display:flex;flex-wrap:wrap;gap:6px 12px;align-items:center}
.dom-body h3 .ref{color:var(--muted);text-transform:none;letter-spacing:0}
ul.it{list-style:none;max-width:760px;border-top:1px solid var(--line)}
ul.it li{display:flex;justify-content:space-between;align-items:baseline;gap:14px;padding:9px 0;border-bottom:1px solid var(--line);font-size:15px;color:var(--ink)}
ul.it .it-note{display:block;font-size:13px;color:var(--ink-soft);margin-top:2px}
.st{flex:none;font-family:var(--mono);font-size:10.5px;font-weight:500;padding:3px 8px;border-radius:3px;border:1px solid;white-space:nowrap}
.st-own{background:var(--own-bg);color:var(--own-fg);border-color:var(--own-bd)}
.st-fam{background:var(--fam-bg);color:var(--fam-fg);border-color:var(--fam-bd)}
.st-study{background:var(--study-bg);color:var(--study-fg);border-color:var(--study-bd);border-style:dashed}
.st-none{background:var(--none-bg);color:var(--none-fg);border-color:var(--none-bd)}
.dom-boundary{margin:18px 0 0;padding:12px 14px;border-left:2px solid var(--clay);background:#FBF8EF;font-size:14px;color:#5C4A1E;max-width:700px}
.dom-body .dom-boundary{font-size:14px;margin-bottom:0}
details.sub{border:1px solid var(--line);margin-top:12px;background:var(--paper)}
details.sub.study{border-style:dashed;border-color:var(--study-bd);background:#F6F8FB}
details.sub>summary{padding:14px 16px}
details.sub .sum-title{font-size:17px}
.sub-body{padding:2px 16px 20px 44px}
.sub-body p{font-size:14.5px}
.tag-dom{background:var(--paper);color:var(--ink-soft);border-color:var(--line);text-decoration:none}
a.tag-dom:hover{border-color:var(--pine);color:var(--pine)}

/* ---------- explorations teaser (home) ---------- */
.mini-list{list-style:none;margin:6px 0 26px;max-width:720px;counter-reset:ex}
.mini-list li{counter-increment:ex;display:flex;gap:14px;align-items:baseline;padding:12px 0;border-top:1px solid var(--line);font-size:16px;color:var(--ink-soft)}
.mini-list li:last-child{border-bottom:1px solid var(--line)}
.mini-list li::before{content:counter(ex,decimal-leading-zero);font-family:var(--mono);font-size:12px;color:var(--muted);flex:none}
.mini-list .tag{margin-left:auto}
.text-link{font-family:var(--mono);font-size:12.5px;letter-spacing:.04em;text-transform:uppercase;text-decoration:none;color:var(--pine);border-bottom:1px solid var(--pine);padding-bottom:2px}
.text-link:hover{color:var(--ink);border-color:var(--ink)}

/* ---------- closing / contact ---------- */
.closing{padding:88px 0 0;text-align:center;border-top:1px solid var(--line)}
.closing-photo{width:220px;height:220px;margin:0 auto 24px;border-radius:50%;overflow:hidden;box-shadow:0 8px 30px rgba(33,31,28,.15)}
.closing-photo img{width:100%;height:100%;object-fit:cover;display:block}
.closing-name{font-family:var(--serif);font-style:italic;font-weight:500;font-size:clamp(26px,4vw,36px)}
.contact{padding:96px 0 88px;text-align:center}
.contact h2{font-family:var(--serif);font-weight:500;font-style:italic;font-size:clamp(30px,5vw,50px);line-height:1.2;margin-bottom:28px}
.contact-links{display:flex;justify-content:center;gap:12px 28px;flex-wrap:wrap;font-size:14px;letter-spacing:.02em}
.contact-links a{text-decoration:none;border-bottom:1px solid var(--ink);padding-bottom:3px}
.contact-links a:hover{color:var(--pine);border-color:var(--pine)}
.location-note{font-family:var(--mono);font-size:12.5px;color:var(--muted);margin-top:14px}
.site-footer{text-align:center;padding:36px 24px;font-size:12.5px;color:var(--muted);border-top:1px solid var(--line)}
.site-footer a{text-decoration:none;border-bottom:1px solid var(--muted)}

/* ---------- sub-page hero ---------- */
.page-hero{padding:64px 0 40px}
.page-hero h1{font-family:var(--serif);font-weight:500;font-size:clamp(32px,5vw,52px);line-height:1.05;letter-spacing:-.01em;max-width:840px}
.lede{margin-top:22px;max-width:700px;font-size:17px;color:var(--ink-soft)}
.lede+.lede{margin-top:14px}
.legend{display:flex;gap:12px 22px;flex-wrap:wrap;margin-top:30px;padding:16px 20px;background:var(--panel);border:1px solid var(--line);border-radius:4px;font-family:var(--mono);font-size:12px}
.legend-item{display:flex;align-items:center;gap:8px}
.dot{width:9px;height:9px;border-radius:50%;display:inline-block;flex:none}
.dot.own{background:var(--own-fg)} .dot.fam{background:var(--fam-fg)} .dot.study{background:var(--study-fg)} .dot.none{background:var(--muted)}
.summary-block{margin-top:24px;padding:22px 24px;background:var(--panel);border:1px solid var(--line);border-radius:4px}
.summary-title{font-family:var(--mono);font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--pine);margin-bottom:14px}
.summary-list{list-style:none;display:flex;flex-wrap:wrap;gap:10px}
.summary-list li{font-family:var(--mono);font-size:12.5px;background:var(--paper);border:1px solid var(--line);border-radius:3px;padding:6px 12px}

/* ---------- work products ---------- */
.part{padding:52px 0;border-top:1px solid var(--line)}
.part-head{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;margin-bottom:6px}
.part-num{font-family:var(--mono);font-size:13px;color:var(--muted);border:1px solid var(--line);border-radius:3px;padding:3px 9px}
.part-title{font-family:var(--serif);font-weight:600;font-size:24px}
.part-scope{margin:12px 0 20px;font-size:15px;color:var(--ink-soft);max-width:700px}
.part-empty{margin:12px 0 4px;font-size:14.5px;color:var(--muted);font-style:italic}
.subpart{margin-top:34px}
.subpart-head{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:4px}
.subpart h3{font-family:var(--serif);font-weight:600;font-size:19px}
.subpart-scope{font-size:14.5px;color:var(--ink-soft);max-width:680px;margin-bottom:10px}
table.wp-table{width:100%;border-collapse:collapse;font-size:14.5px;margin-top:8px}
table.wp-table th{text-align:left;font-family:var(--mono);font-size:11px;letter-spacing:.05em;text-transform:uppercase;color:var(--muted);font-weight:500;padding:0 14px 10px 0;border-bottom:1px solid var(--line)}
table.wp-table td{padding:14px 14px 14px 0;border-bottom:1px solid var(--line);vertical-align:top}
table.wp-table tr:last-child td{border-bottom:none}
.wp-name{font-weight:500}
.wp-type{display:inline-block;margin-left:8px;font-family:var(--mono);font-size:10.5px;letter-spacing:.03em;color:var(--muted);border:1px solid var(--line);border-radius:3px;padding:0 6px;font-weight:400;vertical-align:1px}
.wp-note{color:var(--ink-soft);font-size:13.5px;margin-top:3px}
.wp-note a{color:var(--study-fg)}
td.status-cell{width:200px}
.status{display:inline-block;font-family:var(--mono);font-size:11px;font-weight:500;line-height:1.35;padding:4px 9px;border-radius:3px;border:1px solid;max-width:190px}
.status.own{background:var(--own-bg);color:var(--own-fg);border-color:var(--own-bd)}
.status.fam{background:var(--fam-bg);color:var(--fam-fg);border-color:var(--fam-bd)}
.status.study{background:var(--study-bg);color:var(--study-fg);border-color:var(--study-bd);border-style:dashed}
.status.none{background:var(--none-bg);color:var(--none-fg);border-color:var(--none-bd)}
.context{margin-top:20px;padding:14px 16px;background:#FBF8EF;border-left:2px solid var(--clay);font-size:14px;color:#5C4A1E;max-width:760px}
.flow{margin:14px 0 0 20px;font-size:14.5px;color:var(--ink-soft);max-width:700px}
.flow li{margin-bottom:6px}

/* ---------- explorations ---------- */
.chip-nav{list-style:none;display:flex;flex-wrap:wrap;gap:8px;margin-top:26px}
.chip-nav a{display:inline-block;font-family:var(--mono);font-size:12px;text-decoration:none;color:var(--ink-soft);background:var(--panel);border:1px solid var(--line);border-radius:3px;padding:6px 12px}
.chip-nav a:hover{border-color:var(--pine);color:var(--pine)}
.project{padding:56px 0;border-top:1px solid var(--line)}
.project-head{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;margin-bottom:18px}
.project-num{font-family:var(--mono);font-size:13px;color:var(--muted);border:1px solid var(--line);border-radius:3px;padding:3px 9px}
.project h2{font-family:var(--serif);font-weight:600;font-size:clamp(22px,3vw,28px);line-height:1.2}
.project .tag{margin-left:auto}
dl.spec{display:grid;grid-template-columns:190px 1fr;gap:16px 26px}
dl.spec dt{font-family:var(--mono);font-size:11.5px;letter-spacing:.04em;text-transform:uppercase;color:var(--muted);padding-top:4px}
dl.spec dd{font-size:15.5px;color:var(--ink-soft);max-width:660px}
dl.spec dd ol,dl.spec dd ul{margin-left:18px}
dl.spec dd li{margin-bottom:4px}
.evidence{margin-top:26px;padding:18px 20px;background:var(--panel);border:1px solid var(--line);border-radius:4px}
.evidence h3{font-family:var(--mono);font-size:11.5px;letter-spacing:.05em;text-transform:uppercase;color:var(--study-fg);font-weight:500;margin-bottom:10px}
.evidence ul{list-style:none;display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:8px 18px}
.evidence li{display:flex;justify-content:space-between;gap:10px;font-size:13.5px;color:var(--ink-soft);border-bottom:1px dashed var(--line);padding-bottom:6px}
.evidence .state{font-family:var(--mono);font-size:11px;color:var(--muted);white-space:nowrap}
.evidence li.ready .state{color:var(--own-fg)}

/* ---------- responsive ---------- */
@media (max-width:860px){
  .dom-subs{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  .wrap{padding:0 20px}
  .header-inner{padding:12px 20px}
  .site-nav ul{gap:2px 16px}
  .site-nav a{font-size:11px}
  .story{padding:64px 0}
  .story p{font-size:17.5px}
  .topic-grid{grid-template-columns:1fr}
  dl.spec{grid-template-columns:1fr;gap:4px}
  dl.spec dd{margin-bottom:14px}
  .dom-branches,.dom-subs{grid-template-columns:1fr}
  .dom-body{padding-left:4px}
  .sub-body{padding-left:16px}
  .sum-tags{margin-left:28px}
  .sum-title{font-size:18px}
  ul.it li{flex-direction:column;gap:6px}
  .project .tag{margin-left:0}
  .mini-list li{flex-wrap:wrap}
  .mini-list .tag{margin-left:30px}
  table.wp-table thead{display:none}
  table.wp-table,table.wp-table tbody,table.wp-table tr,table.wp-table td{display:block;width:100%}
  table.wp-table tr{padding:14px 0;border-bottom:1px solid var(--line)}
  table.wp-table td{border-bottom:none;padding:2px 0}
  td.status-cell{width:100%;margin-top:8px}
}

/* specificity fixes: keep small copy small inside .story */
.story p.dom-caption{font-size:13.5px;color:var(--muted);margin-top:14px}
.story .dom-body p.dom-boundary{font-size:14px;color:#5C4A1E;margin:18px 0 0}

/* domain 01: vehicle -> system levels inside the card */
.dom-levels{display:flex;align-items:stretch;gap:10px;margin-top:10px;flex-wrap:wrap}
.dom-levels .lvl{flex:1 1 150px;border:1px solid var(--line);background:var(--panel);padding:8px 10px}
.dom-levels .lvl b{display:block;font-family:var(--mono);font-size:11.5px;font-weight:500;color:var(--ink)}
.dom-levels .lvl i{display:block;font-style:normal;font-family:var(--mono);font-size:11px;color:var(--ink-soft);margin-top:2px}
.dom-levels .lvl-arrow{align-self:center;color:var(--muted);font-family:var(--mono)}
@media (max-width:640px){.dom-levels .lvl-arrow{display:none}.dom-levels{gap:8px}.dom-levels .lvl{flex-basis:100%}}