/* =========================================================
   Abhishek Das — personal site
   Monochrome, sidebar layout. Content centered on viewport.
   ========================================================= */

:root{
  --ink:#181818;
  --soft:#5c5c5c;
  --muted:#9a9a9a;
  --hair:#ececec;
  --hover:#f2f2f0;
  --bg:#ffffff;
  --side:250px;
  --content:680px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  font-size:15px;line-height:1.62;letter-spacing:-.005em;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;height:auto;}

a{color:var(--ink);text-decoration:underline;text-decoration-color:var(--hair);
  text-decoration-thickness:1px;text-underline-offset:2px;
  transition:color .15s;}
a:hover,a:focus{color:var(--ink);}
a:focus-visible{outline:2px solid var(--ink);outline-offset:2px;border-radius:1px;}

/* ---------- Layout ---------- */
.layout{position:relative;}

/* ---------- Sidebar ---------- */
aside.sidebar{
  position:fixed;left:44px;top:72px;width:var(--side);
  height:calc(100vh - 144px);
  display:flex;flex-direction:column;gap:26px;
}
aside.sidebar .intro{display:flex;flex-direction:column;gap:4px;}
aside.sidebar .photo-link{text-decoration:none;display:inline-block;line-height:0;}
aside.sidebar .photo{
  width:58px;height:58px;border-radius:50%;object-fit:cover;
  margin-bottom:12px;border:none;
}
aside.sidebar h1.name{font-size:19px;font-weight:500;letter-spacing:-.01em;margin:0;line-height:1.2;}
aside.sidebar h1.name a{text-decoration:none;color:var(--ink);}
aside.sidebar .role{font-size:14px;color:var(--soft);line-height:1.4;margin:0;white-space:nowrap;}
aside.sidebar .role a{text-decoration:none;color:var(--soft);}
aside.sidebar .role a:hover{color:var(--ink);}

aside.sidebar nav{display:flex;flex-direction:column;gap:3px;margin-bottom:auto;}
aside.sidebar nav a{
  color:var(--ink);font-size:15px;font-weight:400;text-decoration:none;opacity:.5;
  display:flex;align-items:center;gap:9px;padding:2px 0;
  transition:opacity .1s ease;
}
aside.sidebar nav a .ind{width:6px;height:6px;background:transparent;flex-shrink:0;transition:background .1s ease;}
aside.sidebar nav a:hover{opacity:.85;}
aside.sidebar nav a.active{opacity:1;}
aside.sidebar nav a.active .ind{background:var(--ink);}
aside.sidebar .nav-icons{display:flex;flex-wrap:wrap;gap:2px;margin:16px 0 0 9px;}
aside.sidebar .nav-icons a{
  color:var(--ink);opacity:.5;text-decoration:none;line-height:0;
  display:inline-flex;padding:6px;border-radius:2px;
  transition:opacity .1s ease,background-color .1s ease-out,border-radius .1s ease-out;
}
aside.sidebar .nav-icons a:hover{opacity:1;background:var(--hover);border-radius:8px;}
aside.sidebar .nav-icons svg{width:17px;height:17px;fill:currentColor;display:block;}

/* ---------- Main / content ---------- */
main.main{padding:72px 28px 96px;display:flex;justify-content:center;}
.content-col{width:100%;max-width:var(--content);}

/* article wrapper from page/post layouts */
.post{width:100%;}
.post-content{width:100%;}

/* page title (page.html outputs h1.content); hide when empty (homepage) */
h1.content{
  font-size:13px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);
  font-weight:600;margin:0 0 26px;line-height:1.3;border:none;
}
h1.content:empty{display:none;}

/* ---------- Markdown content headings ---------- */
/* top-level section headers: "Bio", "Talks and Interviews", "Publications" */
.post-content h1{
  font-size:13px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);
  font-weight:600;margin:56px 0 22px;line-height:1.3;
  scroll-margin-top:32px;
}
.post-content > h1:first-child{margin-top:0;}
.post-content h2{
  font-size:19px;font-weight:600;letter-spacing:-.01em;line-height:1.3;
  margin:40px 0 12px;color:var(--ink);
}
.post-content h3{
  font-size:16px;font-weight:600;letter-spacing:-.005em;line-height:1.35;
  margin:36px 0 14px;color:var(--ink);
}
.post-content h3 a{text-decoration:none;}
.post-content h4,.post-content h5,.post-content h6{
  font-size:14px;font-weight:600;margin:28px 0 10px;color:var(--ink);
}

.post-content p{margin:0 0 16px;color:#222;}
.post-content ul,.post-content ol{margin:0 0 16px;padding-left:20px;}
.post-content li{margin-bottom:6px;}
.post-content a{color:var(--ink);text-decoration:underline;text-decoration-color:var(--hair);}

/* generic content images */
.post-content img{
  width:100%;margin:14px 0 4px;border:1px solid var(--hair);border-radius:3px;display:block;
}

/* dividers between blocks (publications, sections) */
.post-content hr{
  border:none;border-top:1px solid var(--hair);margin:26px 0;
}

/* ---------- Bio timeline logos ---------- */
#timeline-logos{margin:26px 0 8px;}
#timeline-logos .logo-wrap{
  height:64px;display:flex;align-items:center;justify-content:center;margin-bottom:6px;
}
#timeline-logos .logo-wrap img{
  width:auto;max-height:42px;border:none;margin:0;border-radius:0;
  filter:grayscale(1);opacity:.8;transition:opacity .15s,filter .15s;
}
#timeline-logos a:hover img{filter:grayscale(0);opacity:1;}
#timeline-logos .logo-wrap a{text-decoration:none;}
#timeline-logos .helper{display:none;}
#timeline-logos .logo-desc{
  font-size:11.5px;line-height:1.4;color:var(--muted);text-align:center;
}

/* ---------- Talks ---------- */
.talkd{margin:0 0 8px;}
.talkd a:has(img){text-decoration:none;display:block;line-height:0;}
.talkd img{margin:0;border:1px solid var(--hair);border-radius:3px;}
.talkt{
  display:flex;gap:16px;padding:11px 0;border-top:1px solid var(--hair);
  align-items:baseline;
}
.talkt:first-of-type{border-top:none;}
/* projects reuse .talkt on an h2; drop the inherited .post-content h2 margin */
.post-content h2.talkt{margin:0;}
.talkt a{color:var(--ink);text-decoration:underline;text-decoration-color:var(--hair);font-weight:500;}
.talkt .talkdate{
  flex:0 0 84px;color:var(--muted);font-size:13px;font-weight:400;
}

/* ---------- Publications ---------- */
.pub-intro{color:var(--soft);font-size:14px;margin:0 0 36px;}
/* image + text side-by-side for a more compact list */
.pub{display:flex;flex-direction:row;gap:20px;align-items:flex-start;margin:0;}
.pub .pub-fig{flex:0 0 330px;order:-1;}
.pub .pub-fig img,.pub .pub-fig video{margin:0;width:100%;border:none;border-radius:3px;display:block;}
.pub .pub-fig img + img{margin-top:8px;}
.pub .pub-body{flex:1 1 0;min-width:0;}
.pub .pub-body .pubt{margin-top:0;}

.post-content h2.pubt{
  font-size:15px;font-weight:600;line-height:1.4;letter-spacing:-.005em;
  margin:0 0 5px;color:var(--ink);
}
.pubd{margin:0 0 4px;font-size:14px;line-height:1.55;}
/* author/conf/link spans are block-level; drop redundant <br>s (present in
   some entries, not others) so spacing is consistent across all papers */
.pubd br{display:none;}
.pubd .authors{display:block;color:var(--muted);font-size:13px;margin-bottom:4px;}
.pubd .conf{display:block;color:var(--soft);font-size:12.5px;font-weight:500;margin-bottom:3px;}
.pubd .links{display:block;font-size:12.5px;}
.pubd .links a{
  color:var(--muted);text-decoration:underline;text-decoration-color:var(--hair);
}
.pubd .links a:hover{color:var(--ink);}

/* press mentions inside a publication */
.pressdiv{margin:10px 0 0;display:flex;flex-direction:column;gap:7px;}
.pressdiv a{text-decoration:none;display:flex;align-items:center;gap:11px;}
.press-logo{flex:0 0 60px;height:18px;display:flex;align-items:center;}
.press-logo img{
  max-width:60px;max-height:18px;width:auto;height:auto;
  margin:0;border:none;border-radius:0;background:transparent;
}
.presslink{color:var(--muted);font-size:12px;line-height:1.4;text-decoration:underline;text-decoration-color:var(--hair);transition:color .15s;}
.pressdiv a:hover .presslink{color:var(--ink);}
/* full-width press list (spans content column, two columns when wide) */
.pressdiv-wide{margin-top:16px;}
@media(min-width:620px){
  .pressdiv-wide{display:grid;grid-template-columns:1fr 1fr;column-gap:28px;row-gap:8px;}
}

/* project image helper */
.project-img{width:100%;border:1px solid var(--hair);border-radius:3px;}

/* ---------- Read-more (news) ---------- */
#read-more-button{margin:8px 0;}
#read-more-button a{color:var(--muted);text-decoration:none;cursor:pointer;font-size:14px;}
#read-more-button a:hover{color:var(--ink);}

/* ---------- Post meta (blog) ---------- */
.post .excerpt{font-size:16px;color:var(--soft);font-weight:400;margin:0 0 18px;}
.post .when{color:var(--muted);font-size:13px;margin-top:24px;}
.post .share{margin-top:18px;}

/* ---------- Responsive: collapse rail to centered top bar ---------- */
@media(max-width:1240px){
  aside.sidebar{
    position:static;height:auto;width:100%;max-width:calc(var(--content) + 56px);margin:0 auto;
    padding:44px 28px 0;gap:12px;
  }
  aside.sidebar .role{white-space:normal;}
  aside.sidebar nav{flex-direction:row;flex-wrap:wrap;gap:6px 18px;margin:0;}
  aside.sidebar nav a .ind{display:none;}
  aside.sidebar .nav-icons{order:-1;flex-basis:100%;gap:0;margin:0 0 2px -5px;}
  aside.sidebar .nav-icons a{padding:5px;}
  main.main{padding:12px 28px 72px;}
}
@media(max-width:560px){
  aside.sidebar{padding:34px 22px 0;}
  main.main{padding:10px 22px 56px;}
  .talkt{flex-direction:column;gap:2px;}
  .talkt .talkdate{flex-basis:auto;}
  .pub{flex-direction:column;gap:10px;}
  /* stack text above the figure (override desktop's figure-first order) */
  .pub .pub-fig{flex-basis:auto;width:100%;order:0;}
}