/* ============================================================
   Rakesh Mallipeddi — Personal Website
   Shared design system
   ============================================================ */

:root {
  --scarlet:      #BB0000;
  --scarlet-dark: #8f0000;
  --scarlet-soft: #f7e9e9;
  --ink:          #16161a;
  --charcoal:     #1d1d21;
  --body:         #3f3f46;
  --muted:        #6b6b73;
  --line:         #e6e6e3;
  --line-soft:    #efefec;
  --bg:           #ffffff;
  --bg-soft:      #faf9f7;
  --bg-gray:      #f4f3f0;
  --gray-band:    #2a2a2e;

  --serif: "Spectral", Georgia, "Times New Roman", serif;
  --sans:  "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  --wrap: 1080px;
  --radius: 10px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.05), 0 1px 3px rgba(0,0,0,.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,.06), 0 12px 28px rgba(0,0,0,.06);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--body);
  background: var(--bg);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--scarlet); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--scarlet-dark); text-decoration: underline; text-underline-offset: 2px; }

h1, h2, h3, h4 { font-family: var(--serif); color: var(--ink); font-weight: 600; line-height: 1.2; }

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

/* ---------- Top navigation ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--wrap); margin: 0 auto; padding: 0 28px;
  display: flex; align-items: center; justify-content: space-between;
  height: 66px;
}
.brand {
  font-family: var(--serif);
  font-weight: 700; font-size: 1.18rem; letter-spacing: .01em;
  color: var(--ink); white-space: nowrap;
}
.brand:hover { color: var(--ink); text-decoration: none; }
.brand .dot { color: var(--scarlet); }

.nav-links { display: flex; align-items: center; gap: 2px; list-style: none; margin: 0; padding: 0; }
.nav-links a {
  display: block; padding: 8px 13px;
  font-size: .83rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase;
  color: #52525b; border-radius: 6px; position: relative;
}
.nav-links a:hover { color: var(--scarlet); background: var(--bg-gray); text-decoration: none; }
.nav-links a.active { color: var(--scarlet); }
.nav-links a.active::after {
  content: ""; position: absolute; left: 13px; right: 13px; bottom: 2px;
  height: 2px; background: var(--scarlet); border-radius: 2px;
}

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); margin: 4px 0; transition: .2s; }

/* ---------- Page header band (interior pages) ---------- */
.page-head {
  background: var(--charcoal);
  color: #fff;
  padding: 46px 0 42px;
  position: relative;
  overflow: hidden;
  border-bottom: 4px solid var(--scarlet);
}
.page-head::before {
  content: ""; position: absolute; top: 0; right: -60px; bottom: 0; width: 320px;
  background: linear-gradient(135deg, rgba(187,0,0,.22), rgba(187,0,0,0));
  transform: skewX(-14deg);
}
.page-head .wrap { position: relative; }
.page-head .eyebrow {
  font-size: .78rem; font-weight: 700; letter-spacing: .18em; text-transform: uppercase;
  color: #f0a3a3; margin: 0 0 8px;
}
.page-head h1 { color: #fff; font-size: 2.5rem; margin: 0; }
.page-head p { color: #c9c9cf; margin: 12px 0 0; max-width: 640px; font-size: 1.02rem; }

/* ---------- Sections ---------- */
main { padding-bottom: 20px; }
.section { padding: 54px 0; }
.section + .section { border-top: 1px solid var(--line-soft); }

.section-title {
  font-size: 1.05rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--scarlet); font-weight: 700; font-family: var(--sans);
  margin: 0 0 26px; display: flex; align-items: center; gap: 14px;
}
.section-title::after { content: ""; flex: 1; height: 1px; background: var(--line); }

/* ---------- Hero (home) ---------- */
.hero {
  background: var(--charcoal);
  color: #fff; position: relative; overflow: hidden;
  border-bottom: 4px solid var(--scarlet);
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(1100px 500px at 88% -10%, rgba(187,0,0,.35), transparent 60%),
    radial-gradient(700px 400px at 0% 120%, rgba(187,0,0,.14), transparent 60%);
}
.hero-inner {
  position: relative; max-width: var(--wrap); margin: 0 auto; padding: 66px 28px 60px;
  display: grid; grid-template-columns: 1.5fr 1fr; gap: 54px; align-items: center;
}
.hero .eyebrow {
  font-size: .82rem; font-weight: 700; letter-spacing: .18em; text-transform: uppercase;
  color: #f0a3a3; margin: 0 0 14px;
}
.hero h1 { color: #fff; font-size: 3.35rem; line-height: 1.04; margin: 0 0 16px; letter-spacing: -.01em; }
.hero .role { font-size: 1.32rem; color: #fff; font-family: var(--serif); font-style: italic; margin: 0 0 6px; }
.hero .affil { font-size: 1.02rem; color: #c4c4cc; margin: 0 0 26px; }
.hero .affil a { color: #f0a3a3; }

.hero-links { display: flex; flex-wrap: wrap; gap: 10px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 17px; border-radius: 8px; font-size: .9rem; font-weight: 600;
  border: 1px solid rgba(255,255,255,.22); color: #fff; background: rgba(255,255,255,.05);
  transition: all .16s ease;
}
.btn:hover { background: #fff; color: var(--ink); border-color: #fff; text-decoration: none; }
.btn-primary { background: var(--scarlet); border-color: var(--scarlet); }
.btn-primary:hover { background: #fff; color: var(--scarlet); border-color: #fff; }

.hero-photo { justify-self: center; }
.hero-photo img {
  width: 290px; height: 290px; object-fit: cover; border-radius: 50%;
  border: 5px solid rgba(255,255,255,.12);
  box-shadow: 0 0 0 3px var(--scarlet), 0 24px 50px rgba(0,0,0,.4);
  background: #fff;
}

/* ---------- Quick stats strip ---------- */
.stats {
  background: var(--bg-soft); border-bottom: 1px solid var(--line);
}
.stats-inner {
  max-width: var(--wrap); margin: 0 auto; padding: 26px 28px;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; text-align: center;
}
.stat .num { font-family: var(--serif); font-size: 2rem; font-weight: 700; color: var(--scarlet); line-height: 1; }
.stat .lbl { font-size: .82rem; color: var(--muted); margin-top: 6px; letter-spacing: .03em; }

/* ---------- Prose ---------- */
.prose p { margin: 0 0 16px; }
.lead { font-size: 1.12rem; color: #333; line-height: 1.7; }

/* ---------- Cards / grids ---------- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 22px; }

.card {
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 26px; box-shadow: var(--shadow-sm); transition: box-shadow .18s ease, transform .18s ease;
}
.card:hover { box-shadow: var(--shadow-md); }

.card h3 { margin: 0 0 6px; font-size: 1.12rem; }
.card .meta { font-size: .88rem; color: var(--muted); margin: 0 0 10px; }

/* Info card with scarlet left rule */
.rule-card {
  border-left: 3px solid var(--scarlet); background: var(--bg-soft);
  border-radius: 0 var(--radius) var(--radius) 0; padding: 18px 22px; margin-bottom: 14px;
}
.rule-card .title { font-weight: 700; color: var(--ink); }
.rule-card .sub { color: var(--muted); font-size: .92rem; }

/* ---------- Timeline (education / experience) ---------- */
.tl { border-left: 2px solid var(--line); margin-left: 6px; padding-left: 0; }
.tl-item { position: relative; padding: 0 0 26px 28px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: ""; position: absolute; left: -7px; top: 4px; width: 12px; height: 12px;
  border-radius: 50%; background: var(--scarlet); border: 2px solid #fff; box-shadow: 0 0 0 1px var(--line);
}
.tl-item .role { font-weight: 700; color: var(--ink); font-size: 1.05rem; }
.tl-item .org { color: var(--body); }
.tl-item .when { font-size: .85rem; color: var(--muted); font-weight: 600; letter-spacing: .02em; }
.tl-item .desc { font-size: .95rem; color: var(--muted); margin-top: 4px; }

/* ---------- Publications ---------- */
.pub-list { list-style: none; counter-reset: pub; margin: 0; padding: 0; }
.pub {
  position: relative; padding: 22px 0 22px 56px; border-bottom: 1px solid var(--line-soft);
}
.pub:last-child { border-bottom: 0; }
.pub::before {
  counter-increment: pub; content: counter(pub);
  position: absolute; left: 0; top: 20px;
  width: 34px; height: 34px; border-radius: 50%;
  background: var(--scarlet-soft); color: var(--scarlet);
  font-family: var(--serif); font-weight: 700; font-size: 1rem;
  display: flex; align-items: center; justify-content: center;
}
.pub .authors { color: var(--body); }
.pub .title { color: var(--ink); font-weight: 600; }
.pub .venue { font-weight: 700; }
.pub .venue.jrnl { color: var(--scarlet); }
.pub-meta { margin-top: 8px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }

.badge {
  display: inline-block; font-size: .74rem; font-weight: 700; letter-spacing: .04em;
  padding: 3px 9px; border-radius: 999px; text-transform: uppercase;
}
.badge-link { background: var(--bg-gray); color: #444; border: 1px solid var(--line); }
.badge-link:hover { background: var(--scarlet); color: #fff; border-color: var(--scarlet); text-decoration: none; }
.badge-status { background: #fff3cd; color: #7a5b00; border: 1px solid #f0e0a8; text-transform: none; letter-spacing: .01em; }
.badge-review { background: var(--scarlet-soft); color: var(--scarlet); }
.badge-award { background: #eef6ee; color: #2f6b34; border: 1px solid #d5e8d6; text-transform: none; }

.note-line {
  margin-top: 8px; padding-left: 14px; border-left: 2px solid var(--scarlet-soft);
  font-size: .92rem; color: var(--muted);
}
.note-line .star { color: var(--scarlet); font-weight: 700; }

/* ---------- Simple list items (service, awards) ---------- */
.stack { display: flex; flex-direction: column; gap: 10px; }
.line-item {
  display: flex; gap: 14px; padding: 13px 0; border-bottom: 1px solid var(--line-soft);
}
.line-item:last-child { border-bottom: 0; }
.line-item .mark { color: var(--scarlet); font-weight: 700; flex: none; line-height: 1.5; }
.line-item .yr { flex: none; font-size: .82rem; color: var(--muted); font-weight: 600; min-width: 62px; text-align: right; }

.sub-head {
  font-family: var(--serif); font-size: 1.25rem; color: var(--ink); font-weight: 600;
  margin: 34px 0 14px; padding-bottom: 8px; border-bottom: 2px solid var(--scarlet);
  display: inline-block;
}
.sub-head:first-of-type { margin-top: 0; }

.chips { display: flex; flex-wrap: wrap; gap: 9px; }
.chip {
  font-size: .88rem; font-weight: 600; color: #3f3f46;
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: 999px; padding: 6px 15px;
}

/* ---------- Insights articles ---------- */
.article { padding: 6px 0 34px; border-bottom: 1px solid var(--line); margin-bottom: 34px; }
.article:last-child { border-bottom: 0; margin-bottom: 0; }
.article h2 { font-size: 1.55rem; margin: 0 0 6px; }
.article .byline { color: var(--muted); font-style: italic; font-family: var(--serif); margin: 0 0 18px; }
.article .prose p { margin: 0 0 15px; }

/* ---------- Footer ---------- */
.footer { background: var(--charcoal); color: #b9b9c0; padding: 44px 0 30px; margin-top: 40px; }
.footer-inner { max-width: var(--wrap); margin: 0 auto; padding: 0 28px;
  display: flex; flex-wrap: wrap; gap: 24px; justify-content: space-between; align-items: flex-start; }
.footer .fname { font-family: var(--serif); font-size: 1.3rem; color: #fff; font-weight: 700; margin: 0 0 4px; }
.footer .ftitle { font-size: .92rem; color: #9a9aa3; }
.footer a { color: #f0a3a3; }
.footer-links { display: flex; flex-wrap: wrap; gap: 8px 20px; font-size: .92rem; }
.footer-copy { width: 100%; border-top: 1px solid rgba(255,255,255,.1); margin-top: 30px; padding-top: 20px;
  font-size: .82rem; color: #7c7c85; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .hero-inner { grid-template-columns: 1fr; gap: 34px; text-align: center; padding-top: 48px; }
  .hero h1 { font-size: 2.6rem; }
  .hero-links { justify-content: center; }
  .hero-photo { order: -1; }
  .hero-photo img { width: 200px; height: 200px; }
  .stats-inner { grid-template-columns: 1fr 1fr; gap: 18px; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  body { font-size: 16px; }
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute; top: 66px; left: 0; right: 0; flex-direction: column; gap: 0;
    background: #fff; border-bottom: 1px solid var(--line); padding: 8px 16px 16px;
    box-shadow: var(--shadow-md); display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 8px; width: 100%; }
  .nav-links a.active::after { display: none; }
  .nav-links a.active { background: var(--scarlet-soft); border-radius: 6px; }
  .page-head h1 { font-size: 1.9rem; }
  .hero h1 { font-size: 2.15rem; }
  .section { padding: 40px 0; }
  .line-item .yr { min-width: 48px; }
}