/* ========================================
   Shubham Bhardwaj — Personal Website
   Clean academic single-page design
   ======================================== */

:root {
  --bg: #111;
  --bg-alt: #1a1a1a;
  --text: #e6e6e6;
  --text-muted: #999;
  --accent: #ff6b00;
  --accent-hover: #ff8533;
  --border: #2a2a2a;
  --card-bg: #181818;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --max-width: 900px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover { color: var(--accent-hover); }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ======== NAV ======== */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(17, 17, 17, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav-name {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  letter-spacing: -0.02em;
}

.nav-links { display: flex; gap: 24px; }

.nav-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }

/* ======== HERO ======== */

.hero {
  padding: 80px 0 64px;
  border-bottom: 1px solid var(--border);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 48px;
  align-items: center;
}

.hero h1 {
  font-size: 2.8rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 8px;
}

.hero-tagline {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.hero-bio {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 560px;
  margin-bottom: 28px;
}
.hero-bio strong { color: var(--text); font-weight: 600; }

.hero-links { display: flex; flex-wrap: wrap; gap: 10px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text);
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: all 0.2s;
}
.btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(88, 166, 255, 0.06);
}
.btn svg { flex-shrink: 0; }

.hero-photo img {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--border);
}

/* ======== SECTIONS ======== */

.section {
  padding: 64px 0;
  border-bottom: 1px solid var(--border);
}

.section-alt { background: var(--bg-alt); }

.section-title {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 32px;
}

/* ======== ABOUT ======== */

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.about-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
}

.about-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.about-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 12px;
}

.about-card ul {
  list-style: none;
  padding: 0;
}

.about-card ul li {
  color: var(--text-muted);
  font-size: 0.93rem;
  padding: 4px 0 4px 16px;
  position: relative;
}
.about-card ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.about-card blockquote {
  margin-top: 16px;
  padding: 12px 16px;
  border-left: 3px solid var(--accent);
  color: var(--text-muted);
  font-style: italic;
  font-size: 0.93rem;
  background: rgba(88, 166, 255, 0.04);
  border-radius: 0 8px 8px 0;
}

/* ======== PUBLICATIONS ======== */

.pub-list { display: flex; flex-direction: column; gap: 24px; }

.pub {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 16px;
  padding: 24px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.pub-year {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 500;
  padding-top: 2px;
}

.pub-title {
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 6px;
}

.pub-authors {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 4px;
}

.pub-venue {
  color: var(--text-muted);
  font-size: 0.85rem;
  font-style: italic;
  margin-bottom: 10px;
}

.pub-links { display: flex; gap: 8px; }

.pub-link {
  display: inline-block;
  padding: 4px 12px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 6px;
  transition: all 0.2s;
}
.pub-link:hover {
  background: var(--accent);
  color: var(--bg);
}

.pub-more {
  margin-top: 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ======== BLOG ======== */

.blog-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.blog-grid h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text);
}

.blog-list {
  list-style: none;
  padding: 0;
}

.blog-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
}

.blog-list li a {
  color: var(--text-muted);
  font-size: 0.93rem;
  transition: color 0.2s;
}
.blog-list li a:hover { color: var(--accent); }

.blog-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

.blog-more {
  margin-top: 16px;
  font-size: 0.9rem;
}

/* ======== CONTACT ======== */

.contact-section p {
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* ======== FOOTER ======== */

.footer {
  padding: 32px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ======== RESPONSIVE ======== */

@media (max-width: 768px) {
  .hero { padding: 48px 0 40px; }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    text-align: center;
  }

  .hero-photo { order: -1; }
  .hero-photo img { width: 160px; height: 160px; }

  .hero h1 { font-size: 2rem; }
  .hero-bio { max-width: 100%; }

  .hero-links { justify-content: center; }

  .about-grid { grid-template-columns: 1fr; }
  .blog-grid { grid-template-columns: 1fr; }

  .pub { grid-template-columns: 1fr; }
  .pub-year { font-size: 0.9rem; }

  .nav-links { gap: 16px; }
  .nav-links a { font-size: 0.82rem; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 1.7rem; }
  .hero-links { flex-direction: column; align-items: stretch; }
  .btn { justify-content: center; }
}