/* Tanishk Yadav, portfolio v2 (2026-09-27). Paper and ink, NYU violet accent. */

:root {
  --bg: #faf9f6;
  --surface: #ffffff;
  --surface-2: #f3f1ec;
  --ink: #16161a;
  --ink-2: #45454f;
  --ink-3: #676773;
  --rule: #e4e1da;
  --rule-2: #d3cfc6;
  --accent: #57068c;
  --accent-ink: #ffffff;
  --accent-soft: #f2ebf8;
  --journal: #57068c;
  --journal-bg: #f2ebf8;
  --ssrn: #0b5f5f;
  --ssrn-bg: #e6f2f1;
  --working: #5a4a1a;
  --working-bg: #f5efdd;
  --band: #1b1330;
  --band-ink: #f4f0fa;
  --band-ink-2: #cdc3dd;
  --figure-bg: #ffffff;
  --shadow: 0 1px 2px rgba(22, 22, 26, 0.04), 0 8px 24px rgba(22, 22, 26, 0.06);
  --radius: 14px;
  --radius-sm: 9px;
  --wrap: 1120px;
  --serif: "Newsreader", "Iowan Old Style", Georgia, serif;
  --sans: "Inter", -apple-system, "Segoe UI", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f0f13;
    --surface: #17171d;
    --surface-2: #1d1d24;
    --ink: #ededf1;
    --ink-2: #bdbdc8;
    --ink-3: #9a9aa6;
    --rule: #2a2a33;
    --rule-2: #383843;
    --accent: #c9a2ec;
    --accent-ink: #16101f;
    --accent-soft: #261b33;
    --journal: #d7b8f3;
    --journal-bg: #2a1d38;
    --ssrn: #8fd6cf;
    --ssrn-bg: #10302e;
    --working: #e8d49a;
    --working-bg: #2f2915;
    --band: #1a1426;
    --band-ink: #f4f0fa;
    --band-ink-2: #c7bdd8;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0f0f13;
  --surface: #17171d;
  --surface-2: #1d1d24;
  --ink: #ededf1;
  --ink-2: #bdbdc8;
  --ink-3: #9a9aa6;
  --rule: #2a2a33;
  --rule-2: #383843;
  --accent: #c9a2ec;
  --accent-ink: #16101f;
  --accent-soft: #261b33;
  --journal: #d7b8f3;
  --journal-bg: #2a1d38;
  --ssrn: #8fd6cf;
  --ssrn-bg: #10302e;
  --working: #e8d49a;
  --working-bg: #2f2915;
  --band: #1a1426;
  --band-ink: #f4f0fa;
  --band-ink-2: #c7bdd8;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 84px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
::selection { background: var(--accent-soft); }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 28px; }
.narrow { max-width: 760px; }

.skip {
  position: absolute; left: 12px; top: -48px; z-index: 50;
  background: var(--accent); color: var(--accent-ink);
  padding: 10px 14px; border-radius: var(--radius-sm); font-weight: 600; text-decoration: none;
}
.skip:focus { top: 12px; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(160%) blur(10px);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--rule);
}
.nav-wrap { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand {
  font-family: var(--serif); font-size: 22px; font-weight: 500; letter-spacing: -0.01em;
  color: var(--ink); text-decoration: none; white-space: nowrap;
}
.primary-nav { flex: 1; min-width: 0; overflow-x: auto; scrollbar-width: none; }
.primary-nav::-webkit-scrollbar { display: none; }
.primary-nav ul { display: flex; gap: 4px; list-style: none; margin: 0 0 0 auto; padding: 0; width: max-content; }
.primary-nav a {
  display: block; padding: 8px 12px; border-radius: 999px;
  color: var(--ink-2); text-decoration: none; font-size: 15px; font-weight: 500; white-space: nowrap;
}
.primary-nav a:hover { color: var(--ink); background: var(--surface-2); }
.primary-nav a[aria-current="page"] { color: var(--ink); background: var(--surface-2); }
.nav-actions { display: flex; align-items: center; gap: 8px; }
.theme-toggle {
  width: 38px; height: 38px; border-radius: 999px; border: 1px solid var(--rule);
  background: var(--surface); color: var(--ink-2); cursor: pointer; display: grid; place-items: center;
}
.theme-toggle:hover { color: var(--ink); border-color: var(--rule-2); }
.theme-toggle svg { width: 18px; height: 18px; }
.icon-sun { display: none; }
:root[data-theme="dark"] .icon-sun { display: block; }
:root[data-theme="dark"] .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-sun { display: block; }
  :root:not([data-theme="light"]) .icon-moon { display: none; }
}

/* ---------- buttons, chips ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 18px; border-radius: 999px; border: 1px solid var(--rule-2);
  background: var(--surface); color: var(--ink); font-weight: 600; font-size: 15px;
  text-decoration: none; line-height: 1.2; transition: border-color .15s, background .15s;
}
.btn:hover { border-color: var(--ink-3); text-decoration: none; }
.btn-primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn-primary:hover { filter: brightness(1.08); border-color: var(--accent); }
.btn-small { padding: 8px 14px; font-size: 14px; }
.btn svg { width: 16px; height: 16px; flex: none; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; }

.chip {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--mono); font-size: 12px; font-weight: 500; letter-spacing: 0.02em;
  padding: 4px 10px; border-radius: 999px; white-space: nowrap;
}
.chip-journal { color: var(--journal); background: var(--journal-bg); }
.chip-ssrn { color: var(--ssrn); background: var(--ssrn-bg); }
.chip-working { color: var(--working); background: var(--working-bg); }
.chip-plain { color: var(--ink-2); background: var(--surface-2); }

.kicker {
  font-family: var(--mono); font-size: 13px; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--ink-3); margin: 0 0 14px;
}

/* ---------- typography ---------- */
h1, h2, h3 { font-family: var(--serif); font-weight: 500; letter-spacing: -0.015em; line-height: 1.15; margin: 0; color: var(--ink); }
h1 { font-size: clamp(38px, 5.2vw, 60px); }
h2 { font-size: clamp(28px, 3.4vw, 38px); }
h3 { font-size: 22px; line-height: 1.25; }
p { margin: 0 0 16px; }
.muted { color: var(--ink-2); }
.small { font-size: 14px; color: var(--ink-3); }
.mono { font-family: var(--mono); }

/* ---------- sections ---------- */
section { padding: 88px 0; }
section + section { border-top: 1px solid var(--rule); }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-bottom: 36px; flex-wrap: wrap; }
.section-head p { margin: 10px 0 0; color: var(--ink-2); max-width: 640px; }
.section-link { font-weight: 600; text-decoration: none; white-space: nowrap; }
.section-link:hover { text-decoration: underline; }

/* ---------- hero ---------- */
.hero { padding: 72px 0 64px; border-top: 0; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 56px; align-items: center; }
.hero h1 { font-size: clamp(44px, 6vw, 72px); }
.tagline {
  font-family: var(--serif); font-style: italic; font-size: clamp(24px, 2.7vw, 32px);
  line-height: 1.3; color: var(--accent); margin: 14px 0 22px; max-width: 720px;
}
.lede { font-size: 19px; color: var(--ink-2); max-width: 680px; }
.seeking { font-weight: 600; color: var(--ink); margin-bottom: 26px; }
.portrait {
  width: 100%; aspect-ratio: 1; object-fit: cover; border-radius: 22px;
  border: 1px solid var(--rule); box-shadow: var(--shadow); background: var(--surface-2);
}
.stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; margin-top: 44px; border: 1px solid var(--rule); border-radius: var(--radius); background: var(--surface); }
.stat { padding: 18px 20px; }
.stat + .stat { border-left: 1px solid var(--rule); }
.stat-num { font-family: var(--serif); font-size: 36px; line-height: 1; color: var(--ink); }
.stat-label { font-size: 14px; color: var(--ink-3); margin-top: 6px; }

/* ---------- cards ---------- */
.card {
  background: var(--surface); border: 1px solid var(--rule); border-radius: var(--radius);
  box-shadow: var(--shadow); overflow: hidden; display: flex; flex-direction: column;
}
.card-body { padding: 22px 24px 24px; display: flex; flex-direction: column; gap: 12px; flex: 1; }
.card-meta { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; font-size: 14px; color: var(--ink-3); }
.card h3 a { color: var(--ink); text-decoration: none; }
.card h3 a:hover { color: var(--accent); }
.card p { margin: 0; color: var(--ink-2); font-size: 16px; }
.card-links { display: flex; gap: 16px; flex-wrap: wrap; margin-top: auto; padding-top: 6px; font-size: 15px; font-weight: 600; }
.card-links a { text-decoration: none; }
.card-links a:hover { text-decoration: underline; }
.thumb { background: var(--figure-bg); border-bottom: 1px solid var(--rule); aspect-ratio: 16 / 9; display: grid; place-items: center; padding: 14px; }
.thumb img, .thumb svg { width: 100%; height: 100%; object-fit: contain; }

.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; }

/* featured paper */
.feature { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); }
.feature .thumb { aspect-ratio: auto; border-bottom: 0; border-right: 1px solid var(--rule); padding: 22px; }
.feature .card-body { padding: 34px 34px 32px; gap: 16px; }
.feature h3 { font-size: 30px; }
.feature .finding { font-size: 17px; }
.question, .card p.question { font-family: var(--serif); font-size: 21px; line-height: 1.45; color: var(--ink); }
.card p.question { font-size: 19px; }

/* ---------- thesis band ---------- */
.band { background: var(--band); color: var(--band-ink); border-top: 0 !important; }
.band h2, .band h3 { color: var(--band-ink); }
.band .kicker { color: var(--band-ink-2); }
.band p { color: var(--band-ink-2); }
.band a { color: #e5ccff; }
.band .btn { background: transparent; color: var(--band-ink); border-color: rgba(244, 240, 250, 0.4); }
.band .btn:hover { border-color: var(--band-ink); }
.band .btn-primary { background: var(--band-ink); color: #1b1330; border-color: var(--band-ink); }
.thesis-title { font-size: clamp(28px, 3.2vw, 40px); max-width: 920px; margin: 6px 0 12px; }
.pillars { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; margin: 36px 0; }
.pillar { border: 1px solid rgba(244, 240, 250, 0.16); border-radius: var(--radius); padding: 22px; background: rgba(255, 255, 255, 0.03); }
.pillar h3 { font-size: 22px; margin-bottom: 8px; }
.pillar p { font-size: 15.5px; margin: 0; }
.scale { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; margin-bottom: 34px; }
.scale .stat-num { color: var(--band-ink); }
.scale .stat-label { color: var(--band-ink-2); }
.pillars-light .pillar { border-color: var(--rule); background: var(--surface); box-shadow: var(--shadow); }
.pillars-light .pillar p { color: var(--ink-2); }

/* ---------- lists ---------- */
.principles { counter-reset: p; }
.principle h3 { font-size: 21px; margin-bottom: 8px; }
.principle h3::before { counter-increment: p; content: "0" counter(p); display: block; font-family: var(--mono); font-size: 13px; color: var(--accent); margin-bottom: 10px; letter-spacing: 0.05em; }
.principle p { color: var(--ink-2); margin: 0; font-size: 16px; }

.timeline { display: grid; gap: 28px; }
.tl-item { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 28px; }
.tl-when { font-family: var(--mono); font-size: 13.5px; color: var(--ink-3); padding-top: 4px; }
.tl-item h3 { font-size: 21px; }
.tl-org { color: var(--ink-2); margin: 4px 0 10px; }
.tl-item ul { margin: 0; padding-left: 20px; color: var(--ink-2); }
.tl-item li { margin-bottom: 6px; }

/* ---------- paper page ---------- */
.paper-head { padding: 56px 0 36px; border-top: 0; }
.crumbs { font-size: 14px; color: var(--ink-3); margin-bottom: 22px; }
.crumbs a { color: var(--ink-3); }
.paper-head h1 { font-size: clamp(32px, 4.2vw, 50px); max-width: 980px; margin: 14px 0 16px; }
.byline { color: var(--ink-2); margin-bottom: 26px; }
.status-line { font-size: 15px; color: var(--ink-3); }
.results { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.results.n4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 960px) { .results, .results.n4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 520px) { .results, .results.n4 { grid-template-columns: minmax(0, 1fr); } }
.result { background: var(--surface); border: 1px solid var(--rule); border-radius: var(--radius-sm); padding: 18px 20px; }
.result-num { font-family: var(--mono); font-size: 22px; font-weight: 500; color: var(--ink); letter-spacing: -0.01em; }
.result-label { font-size: 15px; color: var(--ink-2); margin-top: 6px; line-height: 1.5; }
.figure { margin: 0; background: var(--figure-bg); border: 1px solid var(--rule); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.figure img { margin: 0 auto; max-height: 620px; width: auto; }
.figure svg { margin: 0 auto; }
.figure figcaption { font-size: 15px; color: #45454f; margin-top: 14px; line-height: 1.55; }
.figure .fig-no { font-weight: 600; color: #16161a; }
.prose { max-width: 760px; }
.prose p { color: var(--ink-2); }
.prose ul { color: var(--ink-2); padding-left: 20px; }
.prose li { margin-bottom: 8px; }
.block { margin-top: 56px; }
.block h2 { font-size: 28px; margin-bottom: 18px; }
.abstract { font-family: var(--serif); font-size: 19px; line-height: 1.65; color: var(--ink); max-width: 800px; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
details.cite { border: 1px solid var(--rule); border-radius: var(--radius-sm); background: var(--surface); }
details.cite summary { cursor: pointer; padding: 14px 18px; font-weight: 600; }
details.cite pre { margin: 0; padding: 18px; overflow-x: auto; font-family: var(--mono); font-size: 13.5px; line-height: 1.55; background: var(--surface-2); border-top: 1px solid var(--rule); color: var(--ink); }
.copy-row { display: flex; justify-content: flex-end; padding: 10px 14px; border-top: 1px solid var(--rule); }
.author-box { display: grid; grid-template-columns: 96px minmax(0, 1fr); gap: 22px; align-items: center; background: var(--surface); border: 1px solid var(--rule); border-radius: var(--radius); padding: 22px; }
.author-box img { width: 96px; height: 96px; border-radius: 50%; object-fit: cover; }
.author-box p { margin: 4px 0 12px; color: var(--ink-2); }

/* schematic svg */
.schematic text { font-family: var(--sans); fill: #16161a; }
.schematic .box { fill: #ffffff; stroke: #d3cfc6; stroke-width: 1.2; }
.schematic .box-accent { fill: #f2ebf8; stroke: #57068c; stroke-width: 1.4; }
.schematic .arrow { stroke: #676773; stroke-width: 1.4; fill: none; }
.schematic .label-sm { font-size: 12.5px; fill: #45454f; }
.schematic .label { font-size: 15px; font-weight: 600; }

/* ---------- CV ---------- */
.cv-section { padding: 56px 0; }
.cv-section + .cv-section { border-top: 1px solid var(--rule); }
.cv-grid { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 28px; }
.cv-grid h2 { font-size: 26px; }
.course-list { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0 0; padding: 0; list-style: none; }
.course-list li { font-size: 14px; padding: 5px 11px; border-radius: 999px; background: var(--surface-2); color: var(--ink-2); }
.course-list.progress li { background: var(--accent-soft); color: var(--accent); }
.certs { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; }
.cert { text-decoration: none; color: var(--ink); background: var(--surface); border: 1px solid var(--rule); border-radius: var(--radius-sm); overflow: hidden; display: flex; flex-direction: column; }
.cert img { aspect-ratio: 4 / 3; object-fit: cover; object-position: top; border-bottom: 1px solid var(--rule); background: #fff; }
.cert span { padding: 12px 14px; font-size: 14.5px; font-weight: 600; line-height: 1.35; }
.cert small { display: block; font-weight: 400; color: var(--ink-3); margin-top: 3px; }
.skills dt { font-weight: 600; margin-top: 14px; }
.skills dd { margin: 4px 0 0; color: var(--ink-2); }
.pub-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 16px; }
.pub-list li { padding-left: 0; }
.pub-list .pub-title { font-weight: 600; color: var(--ink); }

/* ---------- writing ---------- */
.post { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 28px; align-items: start; }
.post img { border-radius: var(--radius-sm); border: 1px solid var(--rule); aspect-ratio: 16 / 10; object-fit: cover; background: var(--surface-2); }
.post h3 a { color: var(--ink); text-decoration: none; }
.post h3 a:hover { color: var(--accent); }
.post .card-meta { margin-bottom: 8px; }
.post p { color: var(--ink-2); margin: 8px 0 0; }
.note { border-left: 3px solid var(--working); padding: 8px 14px; background: var(--working-bg); color: var(--ink); border-radius: 0 8px 8px 0; font-size: 15px; margin-top: 12px; }
.post-list { display: grid; gap: 40px; }

/* ---------- contact + footer ---------- */
.contact { text-align: left; }
.contact-grid { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 40px; align-items: center; }
.link-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.link-list a { display: flex; justify-content: space-between; gap: 16px; padding: 14px 18px; border: 1px solid var(--rule); border-radius: var(--radius-sm); background: var(--surface); color: var(--ink); text-decoration: none; font-weight: 500; }
.link-list a:hover { border-color: var(--ink-3); }
.link-list .mono { color: var(--ink-3); font-size: 14px; }
.site-footer { border-top: 1px solid var(--rule); padding: 32px 0 44px; font-size: 14px; color: var(--ink-3); }
.footer-row { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.footer-row nav a { color: var(--ink-3); margin-left: 18px; text-decoration: none; }
.footer-row nav a:first-child { margin-left: 0; }
.footer-row nav a:hover { color: var(--ink); }

/* ---------- responsive ---------- */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .hero-grid .portrait-wrap { order: -1; max-width: 180px; }
  .feature { grid-template-columns: minmax(0, 1fr); }
  .feature .thumb { border-right: 0; border-bottom: 1px solid var(--rule); }
  .grid-3, .pillars { grid-template-columns: minmax(0, 1fr); }
  .grid-4, .scale { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .contact-grid, .cv-grid, .tl-item { grid-template-columns: minmax(0, 1fr); gap: 10px; }
}
@media (max-width: 720px) {
  body { font-size: 16px; }
  .wrap { padding: 0 18px; }
  section { padding: 60px 0; }
  html { scroll-padding-top: 116px; }
  .nav-wrap { flex-wrap: wrap; height: auto; padding-top: 10px; padding-bottom: 6px; row-gap: 2px; column-gap: 12px; }
  .brand { font-size: 19px; flex: 1; }
  .primary-nav { order: 3; flex-basis: 100%; margin: 0 -10px; }
  .primary-nav ul { margin: 0; }
  .nav-actions .btn { display: none; }
  .primary-nav a { padding: 7px 10px; font-size: 14.5px; }
  .grid-2 { grid-template-columns: minmax(0, 1fr); }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat:nth-child(3) { border-left: 0; }
  .stat:nth-child(n+3) { border-top: 1px solid var(--rule); }
  .post { grid-template-columns: minmax(0, 1fr); gap: 14px; }
  .feature .card-body { padding: 24px; }
  .author-box { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 460px) {
  .brand { font-size: 17px; }
  .grid-4, .scale { grid-template-columns: minmax(0, 1fr); }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}
@media print {
  .site-header, .theme-toggle, .site-footer, .skip { display: none; }
  body { background: #fff; color: #000; }
  section { padding: 24px 0; }
}