/* ===========================================================================
   Swapnil Mishra — academic site
   Modern, accessible, responsive. Light + dark theme via [data-theme].
   =========================================================================== */

:root {
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Newsreader", Georgia, "Times New Roman", serif;

  --bg: #fbfbfd;
  --bg-soft: #f2f3f7;
  --surface: #ffffff;
  --surface-2: #f7f8fa;
  --border: #e6e8ee;
  --text: #1a1d24;
  --text-soft: #4b5160;
  --text-mut: #6b7280;
  --accent: #3b5bdb;
  --accent-soft: #eaeefb;
  --accent-ink: #2840a8;
  --ring: rgba(59, 91, 219, 0.28);
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.05);
  --shadow: 0 6px 24px rgba(16, 24, 40, 0.07);
  --shadow-lg: 0 18px 50px rgba(16, 24, 40, 0.12);
  --maxw: 1080px;
  --radius: 14px;
  --radius-sm: 9px;
}

[data-theme="dark"] {
  --bg: #0d1017;
  --bg-soft: #0a0d13;
  --surface: #151a23;
  --surface-2: #1b212c;
  --border: #262d3a;
  --text: #e8eaf0;
  --text-soft: #b3b9c7;
  --text-mut: #8a92a4;
  --accent: #7c93f5;
  --accent-soft: #1b2233;
  --accent-ink: #aab9fb;
  --ring: rgba(124, 147, 245, 0.32);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow: 0 8px 28px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 56px rgba(0, 0, 0, 0.55);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "cv02","cv03","cv04","cv11";
}

a { color: var(--accent); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--accent-ink); text-decoration: underline; text-underline-offset: 3px; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

h1, h2, h3 { line-height: 1.18; font-weight: 650; letter-spacing: -0.015em; }

/* ----- Navbar ----- */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { font-weight: 700; font-size: 1.02rem; letter-spacing: -0.02em; color: var(--text); display: flex; align-items: center; gap: 10px; }
.brand:hover { text-decoration: none; }
.brand .mark {
  width: 30px; height: 30px; border-radius: 8px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--accent), #6b8afd); color: #fff; font-weight: 700; font-size: .82rem;
}
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  color: var(--text-soft); font-size: .9rem; font-weight: 500; padding: 8px 11px; border-radius: 8px;
}
.nav-links a:hover { color: var(--text); background: var(--surface-2); text-decoration: none; }
.theme-toggle, .nav-burger {
  background: var(--surface-2); border: 1px solid var(--border); color: var(--text-soft);
  width: 38px; height: 38px; border-radius: 9px; cursor: pointer; display: grid; place-items: center;
  transition: background .15s, color .15s; padding: 0;
}
.theme-toggle:hover, .nav-burger:hover { color: var(--text); background: var(--accent-soft); }
.nav-burger { display: none; }
.theme-toggle svg, .nav-burger svg { width: 18px; height: 18px; }
[data-theme="dark"] .sun { display: block; } [data-theme="dark"] .moon { display: none; }
.sun { display: none; } .moon { display: block; }

/* ----- Hero ----- */
.hero { padding: 74px 0 54px; }
.hero-grid { display: grid; grid-template-columns: 1fr 280px; gap: 52px; align-items: center; }
.hero h1 { font-family: var(--font-serif); font-size: clamp(2.3rem, 5vw, 3.3rem); margin: 0 0 6px; font-weight: 600; }
.hero .role { font-size: 1.12rem; color: var(--text); font-weight: 600; margin: 0; }
.hero .affil { color: var(--text-soft); margin: 2px 0 16px; font-size: 1.02rem; }
.hero .intro { color: var(--text-soft); font-size: 1.05rem; max-width: 56ch; margin: 0 0 22px; }
.hero-photo { justify-self: center; }
.hero-photo img {
  width: 248px; height: 248px; object-fit: cover; object-position: center top; border-radius: 22px;
  box-shadow: var(--shadow-lg); border: 1px solid var(--border);
}
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 20px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; font-weight: 600; font-size: .92rem;
  padding: 10px 18px; border-radius: 10px; border: 1px solid transparent; cursor: pointer; transition: all .16s ease;
}
.btn-primary { background: var(--accent); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--accent-ink); color: #fff; text-decoration: none; transform: translateY(-1px); }
.btn-ghost { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn-ghost:hover { background: var(--surface-2); text-decoration: none; transform: translateY(-1px); }
.btn svg { width: 16px; height: 16px; }

/* social icons */
.socials { display: flex; flex-wrap: wrap; gap: 9px; }
.socials a {
  width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center;
  background: var(--surface); border: 1px solid var(--border); color: var(--text-soft);
  transition: all .16s ease;
}
.socials a:hover { color: #fff; background: var(--accent); border-color: var(--accent); transform: translateY(-2px); text-decoration: none; }
.socials svg { width: 19px; height: 19px; }
.socials .cv-pill { width: auto; padding: 0 14px; font-weight: 650; font-size: .82rem; letter-spacing: .04em; }

/* ----- Sections ----- */
.section { padding: 52px 0; border-top: 1px solid var(--border); }
.section-head { margin-bottom: 30px; }
.section-eyebrow { color: var(--accent); font-weight: 700; font-size: .78rem; letter-spacing: .1em; text-transform: uppercase; }
.section h2 { font-size: clamp(1.5rem, 3vw, 1.95rem); margin: 6px 0 0; }
.section-sub { color: var(--text-mut); margin: 8px 0 0; }

/* About */
.about-grid { display: grid; grid-template-columns: 1.55fr 1fr; gap: 44px; }
.about-bio p { color: var(--text-soft); margin: 0 0 14px; font-size: 1.04rem; }
.chips { display: flex; flex-wrap: wrap; gap: 9px; }
.chip {
  background: var(--accent-soft); color: var(--accent-ink); border: 1px solid color-mix(in srgb, var(--accent) 18%, transparent);
  padding: 6px 13px; border-radius: 999px; font-size: .85rem; font-weight: 550;
}
.side-card h3 { font-size: .82rem; text-transform: uppercase; letter-spacing: .08em; color: var(--text-mut); margin: 0 0 14px; }
.edu-item { margin-bottom: 16px; }
.edu-item .deg { font-weight: 600; }
.edu-item .inst { color: var(--text-soft); font-size: .94rem; }
.edu-item .yr { color: var(--text-mut); font-size: .85rem; }
.side-block + .side-block { margin-top: 30px; }

/* Appointments + Honours */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 26px; box-shadow: var(--shadow-sm); }
.panel h3 { margin: 0 0 18px; font-size: 1.1rem; display: flex; align-items: center; gap: 9px; }
.panel h3 svg { width: 18px; height: 18px; color: var(--accent); }
.pos-item { padding: 11px 0; border-bottom: 1px solid var(--border); }
.pos-item:last-child { border-bottom: none; padding-bottom: 0; }
.pos-item .r { font-weight: 600; }
.pos-item .o { color: var(--text-soft); font-size: .93rem; }
.honour { display: grid; grid-template-columns: 56px 1fr; gap: 14px; padding: 11px 0; border-bottom: 1px solid var(--border); }
.honour:last-child { border-bottom: none; padding-bottom: 0; }
.honour .yr { font-weight: 700; color: var(--accent); font-variant-numeric: tabular-nums; }
.honour .ttl { font-weight: 600; }
.honour .org { color: var(--text-mut); font-size: .88rem; }

/* Publication cards */
.pub-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.pub-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow-sm); transition: transform .18s ease, box-shadow .18s ease, border-color .18s;
  display: flex; flex-direction: column;
}
.pub-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: color-mix(in srgb, var(--accent) 35%, var(--border)); }
.pub-meta { display: flex; align-items: center; gap: 8px; margin-bottom: 11px; flex-wrap: wrap; }
.venue-badge {
  font-size: .74rem; font-weight: 700; letter-spacing: .02em; padding: 4px 10px; border-radius: 7px;
  background: var(--accent-soft); color: var(--accent-ink); white-space: nowrap;
}
.venue-badge.tier-top { background: linear-gradient(135deg, #1f2a5a, #3b5bdb); color: #fff; }
.venue-badge.tier-high { background: #e7f0ff; color: #1d4ed8; }
[data-theme="dark"] .venue-badge.tier-high { background: #16243f; color: #93b4ff; }
.year-tag { font-size: .82rem; color: var(--text-mut); font-variant-numeric: tabular-nums; margin-left: auto; }
.pub-card h3, .pub-title { font-size: 1.04rem; font-weight: 600; margin: 0 0 9px; line-height: 1.35; }
.pub-card h3 a, .pub-title a { color: var(--text); }
.pub-card h3 a:hover, .pub-title a:hover { color: var(--accent); }
.pub-authors { color: var(--text-soft); font-size: .9rem; margin: 0 0 14px; }
.pub-authors .me { color: var(--text); font-weight: 700; }
.pub-links { display: flex; flex-wrap: wrap; gap: 7px; margin-top: auto; }
.pub-link {
  font-size: .8rem; font-weight: 600; padding: 5px 11px; border-radius: 7px;
  background: var(--surface-2); border: 1px solid var(--border); color: var(--text-soft);
}
.pub-link:hover { color: #fff; background: var(--accent); border-color: var(--accent); text-decoration: none; }

.center-link { text-align: center; margin-top: 34px; }

/* Grants */
.grant-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.grant-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 22px; box-shadow: var(--shadow-sm); }
.grant-card .gt { font-weight: 650; font-size: 1.02rem; margin: 0 0 8px; }
.grant-card .meta { display: flex; flex-wrap: wrap; gap: 8px 16px; color: var(--text-soft); font-size: .9rem; }
.grant-card .meta b { color: var(--text); font-weight: 600; }
.grant-card .role-tag { display: inline-block; margin-top: 10px; font-size: .78rem; font-weight: 650; color: var(--accent-ink); background: var(--accent-soft); padding: 4px 10px; border-radius: 6px; }

/* Teaching */
.teach-intro { color: var(--text-soft); max-width: 70ch; margin: 0 0 22px; }
.course { display: grid; grid-template-columns: 150px 1fr auto; gap: 16px; padding: 13px 0; border-bottom: 1px solid var(--border); align-items: baseline; }
.course:last-child { border-bottom: none; }
.course .code { font-weight: 700; color: var(--accent); font-size: .9rem; }
.course .title { color: var(--text); }
.course .yrs { color: var(--text-mut); font-size: .86rem; white-space: nowrap; }

/* Contact */
.contact-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 34px; text-align: center; box-shadow: var(--shadow-sm); }
.contact-card p { color: var(--text-soft); max-width: 52ch; margin: 0 auto 22px; }
.email-row { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.email-link { cursor: pointer; }

/* Footer */
.footer { border-top: 1px solid var(--border); padding: 30px 0; color: var(--text-mut); font-size: .88rem; }
.footer-inner { display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; align-items: center; }
.footer a { color: var(--text-soft); }

/* ===== Publications page ===== */
.pubpage-hero { padding: 54px 0 14px; }
.pubpage-hero h1 { font-family: var(--font-serif); font-size: clamp(2rem, 4vw, 2.7rem); margin: 0 0 8px; font-weight: 600; }
.pub-toolbar { position: sticky; top: 64px; z-index: 20; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); padding: 16px 0; border-bottom: 1px solid var(--border); margin-bottom: 8px; }
.pub-toolbar-inner { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.search-box { position: relative; flex: 1 1 260px; }
.search-box input {
  width: 100%; padding: 11px 14px 11px 40px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); font-size: .95rem; font-family: inherit;
}
.search-box input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--ring); }
.search-box svg { position: absolute; left: 13px; top: 50%; transform: translateY(-50%); width: 17px; height: 17px; color: var(--text-mut); }
.filters { display: flex; gap: 6px; flex-wrap: wrap; }
.filter-btn {
  font-size: .85rem; font-weight: 600; padding: 9px 14px; border-radius: 9px; cursor: pointer;
  background: var(--surface); border: 1px solid var(--border); color: var(--text-soft); transition: all .14s;
}
.filter-btn:hover { color: var(--text); border-color: var(--accent); }
.filter-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.pub-count { color: var(--text-mut); font-size: .88rem; margin-left: auto; }

.year-group { margin: 26px 0; }
.year-heading {
  font-family: var(--font-serif); font-size: 1.5rem; font-weight: 600; color: var(--text);
  padding-bottom: 8px; margin: 0 0 6px; position: relative;
}
.year-heading::after { content: ""; display: block; width: 42px; height: 3px; background: var(--accent); border-radius: 2px; margin-top: 8px; }
.pub-row {
  display: grid; grid-template-columns: 120px 1fr; gap: 20px; padding: 18px 0; border-bottom: 1px solid var(--border);
}
.pub-row:last-child { border-bottom: none; }
.pub-row .venue-col { padding-top: 2px; }
.pub-row .venue-badge { display: inline-block; white-space: normal; word-break: break-word; line-height: 1.3; max-width: 100%; }
.pub-row.is-featured { background: linear-gradient(90deg, var(--accent-soft), transparent); border-radius: 10px; padding-left: 14px; padding-right: 14px; margin: 0 -14px; border-bottom-color: transparent; }
.star { color: #e0a800; }
.no-results { text-align: center; color: var(--text-mut); padding: 60px 0; display: none; }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 30px; text-align: left; }
  .hero-photo { order: -1; justify-self: start; }
  .hero-photo img { width: 150px; height: 150px; border-radius: 18px; }
  .about-grid, .two-col, .pub-grid, .grant-grid { grid-template-columns: 1fr; gap: 22px; }
}
@media (max-width: 720px) {
  .nav-links { position: fixed; inset: 64px 0 auto 0; flex-direction: column; align-items: stretch; gap: 0;
    background: var(--surface); border-bottom: 1px solid var(--border); padding: 8px; transform: translateY(-130%);
    transition: transform .25s ease; box-shadow: var(--shadow); }
  .nav-links.open { transform: translateY(0); }
  .nav-links a { padding: 12px 14px; }
  .nav-links .theme-toggle { display: none; }
  .nav-burger { display: grid; }
  .nav-actions { display: flex; gap: 8px; }
  .pub-row { grid-template-columns: 1fr; gap: 8px; }
  .pub-row .venue-col { padding-top: 0; }
  .course { grid-template-columns: 1fr; gap: 3px; }
  .course .yrs { white-space: normal; }
  .pub-toolbar { position: static; }
  .section { padding: 40px 0; }
}