/* =========================================================================
   Amish Sethi — personal site
   Clean, system-font, warm-paper aesthetic. Light and dark themes.
   ========================================================================= */

:root {
  --paper:      #f5f4ef;
  --paper-2:    #eeece4;
  --ink:        #1b1b19;
  --ink-soft:   #46453f;
  --muted:      #837f74;
  --line:       #e2dfd4;
  --line-soft:  #ebe9e0;
  --link:       #2950e6;
  --link-hover: #0a23a8;
  --surface:    #ffffff;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --maxw: 820px;
  --nav-h: 56px;
}

html[data-theme='dark'] {
  --paper:      #2b2b2b;
  --paper-2:    #333333;
  --ink:        #ededea;
  --ink-soft:   #cfcdc6;
  --muted:      #9b988f;
  --line:       #404040;
  --line-soft:  #3a3a3a;
  --link:       #7aa0ff;
  --link-hover: #a9c2ff;
  --surface:    #343434;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color 0.25s ease, color 0.25s ease;
}

p { margin: 0 0 1em; color: var(--ink-soft); }
strong { font-weight: 600; color: var(--ink); }
em { font-style: italic; }
em.serif, .serif-em { font-style: italic; font-weight: 400; }

a {
  color: var(--link);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover { color: var(--link-hover); }

/* ----------------------------- Navbar ---------------------------------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: var(--paper);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease, background-color 0.25s ease;
}
.nav.scrolled { border-bottom-color: var(--line); }
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; height: var(--nav-h);
  padding: 0 28px; display: flex; align-items: center; justify-content: space-between;
}
.nav-brand { font-weight: 700; font-size: 1.05rem; color: var(--ink); letter-spacing: -0.01em; }
.nav-brand:hover { color: var(--ink); opacity: 0.7; }
.nav-links { display: flex; align-items: center; gap: 22px; }
.nav-links a { color: var(--ink-soft); font-size: 0.96rem; font-weight: 450; }
.nav-links a:hover { color: var(--link); }
.nav-links a.active { color: var(--ink); font-weight: 600; }
.theme-toggle {
  background: none; border: none; cursor: pointer; color: var(--ink-soft);
  padding: 4px; display: inline-flex; font-size: 1rem; margin-left: 2px;
}
.theme-toggle:hover { color: var(--link); }
.nav-toggle { display: none; }

/* ----------------------------- Layout ---------------------------------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 40px 28px 90px; }
section { margin-top: 46px; scroll-margin-top: calc(var(--nav-h) + 14px); }

h2.section-title {
  font-size: 1.18rem; font-weight: 700; letter-spacing: -0.01em;
  margin: 0 0 18px; padding-bottom: 7px; color: var(--ink);
  border-bottom: 1px solid var(--line);
}
h2.section-title .lead { color: inherit; font-style: normal; }

/* ------------------------------ Hero ------------------------------------ */
.hero { display: flex; flex-direction: row; align-items: flex-start; gap: 40px; }
.hero-text { flex: 1; min-width: 0; }
.hero-name { font-size: 2.4rem; font-weight: 700; line-height: 1.05;
  letter-spacing: -0.025em; margin: 0 0 6px; color: var(--ink); }
.hero-name .first { color: inherit; font-style: normal; }
.hero-role { font-size: 1.02rem; color: var(--muted); font-weight: 450; margin: 0 0 22px; }
.hero-text p { font-size: 1.02rem; }
.profile { flex-shrink: 0; width: 215px; }
.profile img { width: 100%; border-radius: 4px; display: block; border: 1px solid var(--line); }
.profile .contact-line { margin-top: 11px; font-size: 0.82rem; color: var(--muted); text-align: center; }

/* social links, plain icons */
.socials { display: flex; gap: 18px; margin-top: 22px; align-items: center; }
.socials a { color: var(--ink-soft); font-size: 1.18rem; line-height: 1; }
.socials a:hover { color: var(--link); }

/* ------------------------------ News ------------------------------------ */
.news { width: 100%; border-collapse: collapse; }
.news td { padding: 8px 0; vertical-align: top; }
.news tr + tr td { border-top: 1px solid var(--line-soft); }
.news .date { width: 118px; white-space: nowrap; padding-right: 18px; padding-top: 9px;
  font-size: 0.84rem; color: var(--muted); }
.news .desc { font-size: 0.97rem; color: var(--ink-soft); }

/* ------------------------- Publications --------------------------------- */
.pub { display: grid; grid-template-columns: 210px 1fr; gap: 26px;
  padding: 22px 0; align-items: center; }
.pub + .pub { border-top: 1px solid var(--line-soft); }
.pub-thumb { width: 100%; border-radius: 4px; overflow: hidden; border: 1px solid var(--line); background: var(--surface); }
.pub-thumb img, .pub-thumb video { width: 100%; height: auto; display: block; }
.pub-title { font-weight: 650; font-size: 1.06rem; line-height: 1.3; margin: 0 0 5px; color: var(--ink); }
.pub-authors { font-size: 0.92rem; color: var(--ink-soft); margin: 0 0 3px; line-height: 1.5; }
.pub-authors .me { font-weight: 700; color: var(--ink); }
.pub-venue { font-size: 0.9rem; color: var(--muted); margin: 0 0 9px; }
.pub-venue em { font-style: italic; }
.pub-venue .spot { color: #9a6a00; font-weight: 600; }
html[data-theme='dark'] .pub-venue .spot { color: #e4b75a; }
.pub-desc { font-size: 0.93rem; color: var(--ink-soft); margin: 8px 0 10px; }

/* status notes rendered as plain text, no pills */
.badge { font-size: inherit; color: var(--muted); }
.badge.gold { color: #9a6a00; font-weight: 600; }
html[data-theme='dark'] .badge.gold { color: #e4b75a; }
.badge.muted { color: var(--muted); }

/* link list, plain bracket-free text links */
.links { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 2px; }
.links a { font-size: 0.88rem; color: var(--link); }
.links a:hover { color: var(--link-hover); }

.note { font-size: 0.9rem; color: var(--muted); margin-top: 16px; }

/* --------------------------- Awards ------------------------------------- */
.award { display: grid; grid-template-columns: 96px 1fr; gap: 20px;
  padding: 14px 0; align-items: baseline; }
.award + .award { border-top: 1px solid var(--line-soft); }
.award .year { font-size: 0.86rem; color: var(--muted); padding-top: 2px; }
.award .body .a-title { font-weight: 600; color: var(--ink); }
.award .body .a-issuer { color: var(--muted); }
.award .body p { margin: 5px 0 0; font-size: 0.93rem; }

/* ------------------------- Experience ----------------------------------- */
.exp { display: grid; grid-template-columns: 110px 1fr; gap: 20px; padding: 14px 0; }
.exp + .exp { border-top: 1px solid var(--line-soft); }
.exp .when { font-size: 0.84rem; color: var(--muted); padding-top: 3px; }
.exp .role { font-weight: 600; color: var(--ink); }
.exp .org { color: var(--link); }
.exp p { margin: 6px 0 0; font-size: 0.93rem; }

ul.clean { margin: 8px 0 0; padding-left: 18px; }
ul.clean li { margin-bottom: 5px; font-size: 0.95rem; color: var(--ink-soft); }

/* ------------------------------ Footer ---------------------------------- */
footer { border-top: 1px solid var(--line); margin-top: 64px; padding: 22px 28px;
  text-align: center; font-size: 0.84rem; color: var(--muted); }
footer a { color: var(--muted); text-decoration: underline; text-underline-offset: 2px; }
footer a:hover { color: var(--link); }

/* ====================== Blog index ===================== */
.post-list { margin-top: 6px; }
.post-item { padding: 22px 0; }
.post-item + .post-item, .post-list .post-item-link + .post-item-link .post-item { border-top: 1px solid var(--line-soft); }
.post-item .p-date { font-size: 0.82rem; color: var(--muted); }
.post-item .p-title { font-size: 1.3rem; font-weight: 700; letter-spacing: -0.02em;
  margin: 4px 0 5px; color: var(--ink); display: inline-block; }
a.post-item-link:hover .p-title { color: var(--link); }
.post-item .p-sub { font-size: 0.96rem; color: var(--ink-soft); margin: 0; }
.post-item .p-tags { margin-top: 9px; display: flex; gap: 14px; }
.post-item .p-tags .badge { font-size: 0.78rem; color: var(--muted); }

/* ====================== Blog post ===================== */
.post-wrap { max-width: 680px; }
.post-head { margin-bottom: 30px; }
.post-head .p-kicker { font-size: 0.82rem; color: var(--muted); margin: 0 0 10px; font-weight: 500; }
.post-head h1 { font-size: 2.15rem; font-weight: 700; line-height: 1.12;
  letter-spacing: -0.025em; margin: 0 0 12px; color: var(--ink); }
.post-head .p-meta { font-size: 0.85rem; color: var(--muted); }
.post-head .p-meta a { color: var(--muted); text-decoration: underline; text-underline-offset: 2px; }
.post-head .p-meta a:hover { color: var(--link); }

.post-body { font-size: 1.06rem; line-height: 1.7; color: var(--ink-soft); }
.post-body > p:first-of-type { font-size: 1.1rem; }
.post-body h2 { font-size: 1.4rem; font-weight: 700; letter-spacing: -0.02em;
  color: var(--ink); margin: 36px 0 12px; }
.post-body h3 { font-weight: 600; font-size: 1.1rem; color: var(--ink); margin: 26px 0 8px; }
.post-body p { margin: 0 0 1.1em; }
.post-body ul, .post-body ol { margin: 0 0 1.1em; padding-left: 22px; }
.post-body li { margin-bottom: 6px; }
.post-body strong { color: var(--ink); }

.post-body blockquote { margin: 1.3em 0; padding: 2px 0 2px 18px;
  border-left: 2px solid var(--line); color: var(--ink); font-style: italic; }

.post-body figure { margin: 24px 0; text-align: center; }
.post-body figure img { max-width: 100%; border-radius: 4px; border: 1px solid var(--line); }
.post-body figcaption { font-size: 0.82rem; color: var(--muted); margin-top: 9px; }

sup.cite { font-size: 0.72em; line-height: 0; }
sup.cite a { color: var(--link); font-weight: 500; padding: 0 1px; }
sup.cite a:hover { color: var(--link-hover); }

.references { margin-top: 44px; padding-top: 20px; border-top: 1px solid var(--line); }
.references h2 { font-size: 0.92rem; font-weight: 700; color: var(--ink); margin: 0 0 14px; letter-spacing: 0; }
.references ol { margin: 0; padding-left: 26px; }
.references li { font-size: 0.86rem; line-height: 1.5; color: var(--ink-soft);
  margin-bottom: 9px; scroll-margin-top: calc(var(--nav-h) + 14px); }
.references li .r-title { color: var(--ink); }
.references li a { word-break: break-word; }

.callout { margin: 26px 0; padding: 16px 20px; border-radius: 4px;
  background: var(--paper-2); border: 1px solid var(--line); font-size: 0.98rem; color: var(--ink-soft); }
.callout strong { color: var(--ink); }

.post-body .katex { font-size: 1.02em; }
.post-body .katex-display { margin: 1.2em 0; overflow-x: auto; overflow-y: hidden; }

.post-foot { margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--line); font-size: 0.9rem; }

.pub-group-title { font-size: 0.92rem; font-weight: 700; color: var(--ink);
  margin: 40px 0 6px; padding-bottom: 6px; }

/* ------------------------- Responsive ----------------------------------- */
@media (max-width: 720px) {
  body { font-size: 16px; }
  .nav-links { gap: 15px; }
  .nav-links a { font-size: 0.9rem; }
  .hero { flex-direction: column-reverse; align-items: center; gap: 22px; }
  .profile { width: 150px; }
  .pub { grid-template-columns: 1fr; gap: 14px; }
  .pub-thumb { max-width: 300px; }
  .award, .exp { grid-template-columns: 1fr; gap: 3px; }
  .award .year, .exp .when { padding-top: 0; }
  .hero-name { font-size: 2.1rem; }
  .post-head h1 { font-size: 1.8rem; }
}