/* ═══════════════════════════════════════════════════════
   MAYANK KUNDALWAL — ACADEMIC PORTFOLIO
   Light Professional Design
   Palette: Warm Cream, Deep Navy, Burgundy Accent
   Typography: Source Serif 4 + Inter
   ═══════════════════════════════════════════════════════ */

:root {
  /* Warm light palette */
  --bg:         #faf8f5;
  --bg-tint:    #f2efe9;
  --bg-hero:    #f5f2ec;
  --white:      #ffffff;
  --ink:        #1c1917;
  --ink-2:      #292524;
  --ink-3:      #57534e;
  --ink-4:      #78716c;
  --ink-5:      #a8a29e;
  --accent:     #7c2d12;
  --accent-bg:  #fef2f2;
  --accent-2:   #9a3412;
  --navy:       #1e293b;
  --navy-soft:  #334155;
  --teal:       #0f766e;
  --border:     #e7e5e4;
  --border-dark:#d6d3d1;

  --font-serif: 'Source Serif 4', Georgia, serif;
  --font-sans:  'Inter', -apple-system, sans-serif;
  --font-mono:  'JetBrains Mono', monospace;

  --max-w:   1080px;
  --nav-h:   60px;
  --ease:    cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── RESET ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; scroll-padding-top: calc(var(--nav-h) + 1.5rem); color-scheme: light only; }
body {
  background-color: #faf8f5 !important;
  color: #292524 !important;
  font-family: var(--font-sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent-2); }
::selection { background: var(--accent); color: #fff; }

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 clamp(1.25rem, 3vw, 2.5rem); width: 100%; }

/* ── PROGRESS BAR ──────────────────────────────────── */
#scroll-progress {
  position: fixed; top: 0; left: 0; height: 2px;
  background: var(--accent); width: 0%; z-index: 1100;
}

/* ── REVEAL ────────────────────────────────────────── */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ══════════════════════════════════════════════════════
   NAV — Clean top bar
   ══════════════════════════════════════════════════════ */
#nav {
  position: fixed; top: 0; left: 0; width: 100%; height: var(--nav-h);
  background-color: rgba(250, 248, 245, 0.95) !important;
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid #e7e5e4;
  z-index: 1000;
}
.nav-inner {
  max-width: var(--max-w); margin: 0 auto; height: 100%;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 clamp(1.25rem, 3vw, 2.5rem);
}
.logo {
  font-family: var(--font-serif); font-size: 1.05rem; font-weight: 400;
  color: #1c1917 !important; letter-spacing: -0.01em;
}
.logo strong { font-weight: 700; color: #1c1917 !important; }

.nav-links { display: flex; gap: 1.75rem; list-style: none; }
.nav-links a {
  color: #78716c !important; font-size: .8rem; font-weight: 500;
  letter-spacing: .02em; transition: color .2s;
}
.nav-links a:hover, .nav-links a.active { color: #7c2d12 !important; }

.nav-cv-btn {
  display: inline-flex; align-items: center; gap: .35rem;
  font-size: .78rem; font-weight: 600; padding: .4rem .85rem;
  border: 1.5px solid var(--accent); color: var(--accent) !important;
  border-radius: 4px; transition: all .25s;
}
.nav-cv-btn:hover { background: var(--accent); color: #fff !important; }

#ham { display: none; background: none; border: none; cursor: pointer; flex-direction: column; gap: 5px; padding: 4px; }
#ham span { width: 20px; height: 2px; background: var(--ink); border-radius: 2px; transition: all .3s var(--ease); }
#mob-menu { display: none; }

@media (max-width: 768px) {
  .nav-links, .nav-actions { display: none; }
  #ham { display: flex; }
  #mob-menu {
    position: fixed; top: var(--nav-h); left: 0; width: 100%;
    background: var(--bg); border-bottom: 1px solid var(--border);
    padding: 1.25rem 1.5rem; display: flex; flex-direction: column; gap: .6rem; z-index: 999;
  }
  #mob-menu[hidden] { display: none !important; }
  #mob-menu a { color: var(--ink-3); font-weight: 500; font-size: .92rem; padding: .4rem 0; }
  #mob-menu a:hover { color: var(--accent); }
  .mob-cv-link { border-top: 1px solid var(--border); padding-top: .75rem !important; margin-top: .25rem; color: var(--accent) !important; }
}

/* ══════════════════════════════════════════════════════
   HERO — Light, warm, dense
   ══════════════════════════════════════════════════════ */
#hero {
  position: relative;
  padding: calc(var(--nav-h) + 3.5rem) 0 3.5rem;
  background-color: #f5f2ec !important;
  border-bottom: 1px solid #e7e5e4;
  overflow: hidden;
}

/* Subtle accent strip on left */
.hero-accent {
  position: absolute; left: 0; top: 0; bottom: 0; width: 5px;
  background: linear-gradient(180deg, var(--accent), var(--teal));
}

.hero-grid {
  display: grid; grid-template-columns: 1.2fr 0.8fr;
  gap: clamp(2rem, 4vw, 4.5rem); align-items: start;
}
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; gap: 2rem; } }

.hero-left { animation: fadeIn .7s var(--ease) both; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

.hero-badge {
  display: inline-block; font-family: var(--font-mono); font-size: .65rem;
  font-weight: 500; letter-spacing: .14em; text-transform: uppercase;
  color: #7c2d12 !important; background-color: #fef2f2 !important;
  padding: .3rem .75rem; border-radius: 3px; margin-bottom: 1.25rem;
}

#hero h1 {
  font-family: var(--font-serif); font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 700; line-height: 1.12; color: #1c1917 !important;
  margin-bottom: .85rem; letter-spacing: -0.02em;
}

/* Typewriter */
.hero-tw {
  display: flex; align-items: center; gap: .4rem;
  margin-bottom: 1rem; min-height: 1.4rem;
}
.tw-arrow { color: var(--accent); font-weight: 700; font-size: 1rem; }
#typewriter { font-family: var(--font-mono); font-size: .82rem; color: #57534e !important; }
.tw-cursor { color: var(--accent); animation: blink .75s step-end infinite; font-weight: 300; }
@keyframes blink { from, to { opacity: 0; } 50% { opacity: 1; } }

.hero-bio {
  font-size: .9rem; color: #57534e !important; line-height: 1.7;
  margin-bottom: 1.5rem; max-width: 500px;
}

/* Buttons */
.hero-actions { display: flex; gap: .6rem; margin-bottom: 1.75rem; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: .35rem;
  font-weight: 600; font-size: .82rem; padding: .6rem 1.4rem;
  border-radius: 4px; transition: all .25s var(--ease); cursor: pointer;
}
.btn-fill {
  background: var(--accent); color: #fff; border: 1.5px solid var(--accent);
}
.btn-fill:hover { background: var(--accent-2); border-color: var(--accent-2); color: #fff; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(124,45,18,0.15); }
.btn-outline {
  background: transparent; color: var(--ink-3); border: 1.5px solid var(--border-dark);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }

/* Social */
.hero-social { display: flex; gap: .5rem; }
.hero-social a {
  width: 34px; height: 34px; border-radius: 6px;
  border: 1px solid #e7e5e4; background-color: #ffffff !important;
  display: flex; align-items: center; justify-content: center;
  color: #78716c !important; transition: all .25s;
}
.hero-social a svg { width: 15px; height: 15px; }
.hero-social a:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-2px); box-shadow: 0 3px 8px rgba(0,0,0,0.04); }

/* Right — Info Cards */
.hero-right { animation: fadeIn .7s var(--ease) .2s both; display: flex; flex-direction: column; gap: .5rem; }
.info-card {
  background-color: #ffffff !important; border: 1px solid #e7e5e4;
  border-radius: 6px; padding: .85rem 1rem; transition: border-color .25s;
}
.info-card:hover { border-color: #d6d3d1; }
.ic-highlight { border-left: 3px solid #7c2d12; }
.ic-label {
  font-family: var(--font-mono); font-size: .58rem; font-weight: 500;
  letter-spacing: .12em; text-transform: uppercase; color: #a8a29e !important;
  margin-bottom: .2rem;
}
.ic-value { font-size: .88rem; font-weight: 600; color: #1c1917 !important; line-height: 1.35; }
.ic-value--sm { font-size: .8rem; font-weight: 500; color: #1c1917 !important; }
.ic-sub { font-size: .75rem; color: #78716c !important; margin-top: .1rem; }

/* ══════════════════════════════════════════════════════
   SECTIONS
   ══════════════════════════════════════════════════════ */
.section { padding: clamp(3.5rem, 7vw, 5.5rem) 0; }
.section-tinted { background-color: #f2efe9 !important; }

.overline {
  font-family: var(--font-mono); font-size: .62rem; font-weight: 500;
  letter-spacing: .16em; text-transform: uppercase; color: var(--accent);
  margin-bottom: .4rem;
}

.section h2, h2 {
  font-family: var(--font-serif); font-size: clamp(1.5rem, 2.8vw, 1.9rem);
  font-weight: 700; color: #1c1917 !important; margin-bottom: 1.5rem;
  line-height: 1.2; letter-spacing: -0.01em;
}

/* ── COLUMNS ───────────────────────────────────────── */
.cols { display: grid; grid-template-columns: 1.25fr 1fr; gap: clamp(2.5rem, 5vw, 4.5rem); align-items: start; }
@media (max-width: 900px) { .cols { grid-template-columns: 1fr; gap: 2.5rem; } }

/* ══ ABOUT ════════════════════════════════════════════ */
.about-bio p { color: #57534e !important; font-size: .88rem; margin-bottom: .85rem; }

.fw-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .45rem; margin-top: 1.25rem; }
@media (max-width: 600px) { .fw-grid { grid-template-columns: 1fr; } }
.fw {
  background-color: #ffffff !important; border: 1px solid #e7e5e4; border-radius: 5px;
  padding: .7rem .85rem; display: flex; flex-direction: column; gap: .2rem;
  transition: border-color .25s;
}
.fw:hover { border-color: #7c2d12; }
.fw-tag {
  font-family: var(--font-mono); font-size: .65rem; font-weight: 600;
  color: #7c2d12 !important; letter-spacing: .05em;
}
.fw span:last-child { font-size: .76rem; color: #78716c !important; line-height: 1.4; }

/* Education */
.edu-stack { display: flex; flex-direction: column; gap: .75rem; }
.edu {
  display: grid; grid-template-columns: auto 1fr; gap: .85rem;
  padding: .75rem 0; border-bottom: 1px solid var(--border); align-items: start;
}
.edu:last-child { border-bottom: none; }
.edu-left { display: flex; flex-direction: column; align-items: flex-start; gap: .2rem; min-width: 60px; }
.edu-badge {
  font-size: .6rem; font-weight: 700; padding: .15rem .45rem;
  background: var(--accent-bg); color: var(--accent); border-radius: 3px;
  letter-spacing: .04em;
}
.edu-yr { font-size: .68rem; color: var(--ink-5); font-weight: 500; white-space: nowrap; }
.edu-right strong { display: block; font-size: .88rem; font-weight: 600; color: #1c1917 !important; }
.edu-right span { font-size: .8rem; color: #78716c !important; }

/* ══ RESEARCH ════════════════════════════════════════ */
.r-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .85rem; }
@media (max-width: 700px) { .r-grid { grid-template-columns: 1fr; } }

.r-card {
  background-color: #ffffff !important; border: 1px solid #e7e5e4; border-radius: 6px;
  padding: 1.5rem; transition: all .3s var(--ease);
}
.r-card:hover { border-color: #7c2d12; transform: translateY(-3px); box-shadow: 0 6px 20px rgba(0,0,0,0.04); }
.r-num {
  font-family: var(--font-serif); font-size: 1.1rem; font-weight: 700;
  color: #a8a29e !important; opacity: .4; margin-bottom: .35rem;
}
.r-card h3 { font-size: .98rem; font-weight: 700; color: #1c1917 !important; margin-bottom: .4rem; }
.r-card p { font-size: .8rem; color: #78716c !important; line-height: 1.55; }

/* ══ PUBLICATIONS ════════════════════════════════════ */
.pub-cat {
  font-family: var(--font-serif); font-size: 1rem; font-weight: 600;
  color: var(--ink-4); border-bottom: 1px solid var(--border);
  padding-bottom: .35rem; margin-bottom: 1rem; margin-top: 2rem;
}
.pub-cat:first-of-type { margin-top: 0; }

.pub-list { display: flex; flex-direction: column; }

.pub {
  display: grid; grid-template-columns: 44px 1fr auto; gap: 1rem;
  align-items: baseline; padding: .85rem 0;
  border-bottom: 1px solid var(--border); transition: background .15s;
}
.pub:last-child { border-bottom: none; }
.pub:hover { background: rgba(124,45,18,0.02); margin: 0 -.75rem; padding-left: .75rem; padding-right: .75rem; border-radius: 4px; }

@media (max-width: 700px) {
  .pub { grid-template-columns: 1fr; gap: .3rem; }
  .pub:hover { margin: 0; padding-left: 0; padding-right: 0; }
}

.pub-yr {
  font-family: var(--font-mono); font-size: .7rem; font-weight: 600;
  color: var(--ink-5); padding-top: .1rem;
}
.pub-body h4 { font-size: .88rem; font-weight: 600; line-height: 1.35; margin-bottom: .15rem; }
.pub-body h4 a { color: #1c1917 !important; }
.pub-body h4 a:hover { color: #7c2d12 !important; }
.pub-body p { font-size: .76rem; color: #78716c !important; }
.pub-me { font-weight: 700; color: var(--accent); }
.pub-link {
  font-size: .65rem; font-weight: 600; color: var(--accent);
  white-space: nowrap; padding: .2rem .55rem; border-radius: 3px;
  background: var(--accent-bg); transition: all .2s; align-self: center;
}
.pub-link:hover { background: var(--accent); color: #fff; }

/* ══ EXPERIENCE & SKILLS ═════════════════════════════ */
.exp-stack { display: flex; flex-direction: column; gap: 1.25rem; }
.exp {
  border-left: 2px solid var(--accent);
  padding-left: 1rem;
}
.exp h4 { font-size: .95rem; font-weight: 700; color: #1c1917 !important; margin-bottom: .1rem; }
.exp-where { font-size: .74rem; font-weight: 600; color: #7c2d12 !important; margin-bottom: .35rem; }
.exp p:last-child { font-size: .82rem; color: #57534e !important; line-height: 1.6; }

.sk-group { margin-bottom: 1.25rem; }
.sk-group:last-child { margin-bottom: 0; }
.sk-group h4 {
  font-size: .65rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: .1em; color: var(--ink-5); margin-bottom: .4rem;
}
.pills { display: flex; flex-wrap: wrap; gap: .3rem; }
.pills span {
  font-size: .72rem; font-weight: 500; padding: .25rem .6rem;
  background-color: #ffffff !important; border: 1px solid #e7e5e4; border-radius: 100px;
  color: #57534e !important; transition: all .2s;
}
.pills span:hover { border-color: #7c2d12; color: #7c2d12 !important; }

/* ══ CONTACT ═════════════════════════════════════════ */
.contact-wrap { max-width: 680px; text-align: center; }
.contact-pitch { font-size: .95rem; color: var(--ink-3); max-width: 520px; margin: 0 auto 2rem; line-height: 1.6; }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .5rem; text-align: left; }
@media (max-width: 600px) { .contact-grid { grid-template-columns: 1fr; } }

.c-card {
  display: flex; align-items: center; gap: .65rem;
  background-color: #ffffff !important; border: 1px solid #e7e5e4; border-radius: 6px;
  padding: .75rem 1rem; color: #57534e !important; transition: all .25s;
}
.c-card svg { width: 18px; height: 18px; flex-shrink: 0; color: #7c2d12 !important; }
.c-card span { font-size: .8rem; font-weight: 500; color: #57534e !important; }
.c-card:hover { border-color: #7c2d12; color: #7c2d12 !important; transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,0.04); }

/* ══ FOOTER ══════════════════════════════════════════ */
#footer {
  padding: 2rem 0; border-top: 1px solid #e7e5e4;
  text-align: center; color: #78716c !important; font-size: .8rem;
  background-color: #faf8f5 !important;
}
#footer strong { color: #1c1917 !important; }