/* ==========================================================================
   Ritesh Moon — Academic Portfolio
   New professional multi-page theme (navy & white)
   ========================================================================== */

:root {
  --navy-dark:   #0c1f36;
  --navy:        #16324f;
  --navy-mid:    #234a72;
  --navy-light:  #3b6ea5;
  --gold:        #c8a24a;

  --bg:          #ffffff;
  --bg-alt:      #f4f6f9;
  --bg-card:     #f7f8fb;
  --border:      #e3e7ee;

  --text:        #202632;
  --text-muted:  #5c6577;
  --text-faint:  #8892a0;

  --sidebar-w:   280px;
  --max-w:       860px;

  --font-head: 'Lora', Georgia, 'Times New Roman', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  --shadow: 0 1px 3px rgba(12, 31, 54, 0.08), 0 1px 2px rgba(12, 31, 54, 0.06);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a {
  color: var(--navy-mid);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover { color: var(--navy-light); text-decoration: underline; }

h1, h2, h3, h4, h5 {
  font-family: var(--font-head);
  color: var(--navy-dark);
  font-weight: 600;
  line-height: 1.25;
  margin: 0 0 0.5em;
}

ul { padding-left: 1.25em; }
li { margin-bottom: 0.35em; }

/* ---------- Layout ---------- */

.layout {
  display: flex;
  min-height: 100vh;
  align-items: stretch;
}

/* ---------- Sidebar ---------- */

.sidebar {
  width: var(--sidebar-w);
  flex: 0 0 var(--sidebar-w);
  background: linear-gradient(180deg, var(--navy-dark) 0%, var(--navy) 100%);
  color: #e8edf5;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  padding: 2.75rem 1.75rem 2rem;
  z-index: 20;
}

.sidebar-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.avatar {
  width: 128px;
  height: 128px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid rgba(255,255,255,0.15);
  box-shadow: 0 4px 18px rgba(0,0,0,0.35);
  margin-bottom: 1.1rem;
}

.sidebar .name {
  color: #ffffff;
  font-size: 1.4rem;
  margin-bottom: 0.35em;
}

.sidebar .role {
  font-size: 0.92rem;
  color: #cdd8e8;
  margin: 0 0 0.15em;
}

.sidebar .affiliation {
  font-size: 0.85rem;
  color: #9fb0c6;
  margin: 0 0 1.3rem;
}

.social-icons {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 1.4rem;
}

.social-icons a {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  color: #dbe4f0;
  font-size: 0.85rem;
  border: 1px solid rgba(255,255,255,0.12);
}
.social-icons a:hover {
  background: var(--gold);
  color: var(--navy-dark);
  text-decoration: none;
  border-color: var(--gold);
}

.cv-button {
  display: inline-block;
  width: 100%;
  text-align: center;
  padding: 0.65em 1em;
  background: var(--gold);
  color: var(--navy-dark);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.03em;
  border-radius: 5px;
  margin-bottom: 1.6rem;
}
.cv-button:hover {
  background: #dcb75d;
  color: var(--navy-dark);
  text-decoration: none;
}

.sidebar-nav {
  width: 100%;
  border-top: 1px solid rgba(255,255,255,0.12);
  padding-top: 1.2rem;
}
.sidebar-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.sidebar-nav a {
  display: block;
  padding: 0.55em 0.75em;
  color: #cdd8e8;
  font-size: 0.92rem;
  font-weight: 500;
  border-radius: 5px;
  text-decoration: none;
}
.sidebar-nav a:hover {
  background: rgba(255,255,255,0.08);
  color: #ffffff;
}
.sidebar-nav a.active {
  background: rgba(200, 162, 74, 0.16);
  color: var(--gold);
  font-weight: 600;
}

.nav-toggle {
  display: none;
}

/* ---------- Main content ---------- */

.content {
  flex: 1 1 auto;
  min-width: 0;
  background: var(--bg);
}

.content-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 3.5rem 2.5rem 2rem;
}

.page-eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--navy-light);
  margin-bottom: 0.6em;
}

.page-title {
  font-size: 2.1rem;
  margin-bottom: 0.3em;
}

.page-lede {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 640px;
  margin-bottom: 2.5rem;
}

section.block {
  margin-bottom: 3rem;
}

section.block h2 {
  font-size: 1.35rem;
  padding-bottom: 0.5em;
  border-bottom: 2px solid var(--border);
  margin-bottom: 1.2em;
}

section.block h3.sub {
  font-size: 1.05rem;
  color: var(--navy);
  margin: 1.6em 0 0.8em;
}

p { margin: 0 0 1em; color: var(--text); }

.text-muted { color: var(--text-muted); }

/* ---------- Home hero ---------- */

.home-hero {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  margin-bottom: 2.5rem;
}

.home-hero p.lede {
  font-size: 1.12rem;
  color: var(--text);
}

.highlight-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.9rem;
  margin-top: 1.5rem;
}

.highlight-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--navy-light);
  border-radius: 6px;
  padding: 1rem 1.15rem;
}
.highlight-card .h-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-faint);
  font-weight: 600;
  margin-bottom: 0.3em;
}
.highlight-card .h-value {
  font-size: 0.93rem;
  color: var(--text);
  font-weight: 500;
}

/* ---------- Timeline ---------- */

.timeline {
  position: relative;
  padding-left: 1.6rem;
  border-left: 2px solid var(--border);
}
.timeline-item {
  position: relative;
  padding-bottom: 1.8rem;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: '';
  position: absolute;
  left: -1.68rem;
  top: 0.3rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--navy-light);
  border: 2px solid #fff;
  box-shadow: 0 0 0 2px var(--navy-light);
}
.timeline-item h4 {
  font-size: 1rem;
  color: var(--navy-dark);
  margin-bottom: 0.2em;
}
.timeline-date {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--navy-light);
  font-weight: 600;
  margin-bottom: 0.4em;
}
.timeline-item p { margin-bottom: 0.4em; color: var(--text-muted); }
.timeline-item ul { margin: 0.4em 0 0; padding-left: 1.1em; }
.timeline-item ul li { font-size: 0.95rem; color: var(--text); margin-bottom: 0.4em; }

/* ---------- Project cards ---------- */

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.4rem 1.5rem;
  margin-bottom: 1.3rem;
}
.project-card h4 {
  font-size: 1.05rem;
  margin-bottom: 0.6em;
}
.project-card p { color: var(--text-muted); margin-bottom: 0; }
.project-card p a { color: var(--navy-mid); font-weight: 600; }

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.9rem;
}
.tag {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 0.28em 0.7em;
  background: rgba(35, 74, 114, 0.08);
  color: var(--navy);
  border-radius: 20px;
}

/* ---------- Skill tags ---------- */

.skill-group { margin-bottom: 1.6rem; }
.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.skill-tag {
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.42em 0.9em;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--navy);
}

/* ---------- Publications ---------- */

.pub-list { margin-bottom: 0.5rem; }
.pub-item {
  display: flex;
  gap: 1.2rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--border);
}
.pub-item:last-child { border-bottom: none; }
.pub-year {
  flex: 0 0 3.2rem;
  font-weight: 700;
  color: var(--navy-light);
  font-size: 0.95rem;
  padding-top: 0.15em;
}
.pub-title {
  font-weight: 600;
  color: var(--navy-dark);
  margin-bottom: 0.3em;
}
.pub-meta {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 0;
}

/* ---------- Contact ---------- */

.contact-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.7rem;
}
.contact-links li {
  margin-bottom: 0;
}
.contact-links a {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.85em 1.1em;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
  text-decoration: none;
}
.contact-links a:hover {
  border-color: var(--navy-light);
  background: #eef2f8;
  text-decoration: none;
}
.contact-links .icon {
  width: 20px;
  text-align: center;
  color: var(--navy-light);
  font-size: 1rem;
  flex-shrink: 0;
}
.contact-note {
  color: var(--text-muted);
  margin-bottom: 1.8rem;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-block;
  padding: 0.7em 1.4em;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
}
.btn-primary {
  background: var(--navy);
  color: #fff;
}
.btn-primary:hover { background: var(--navy-mid); color: #fff; text-decoration: none; }

/* ---------- Footer ---------- */

.site-footer {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 1.5rem 2.5rem 3rem;
  color: var(--text-faint);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
}
.site-footer a { color: var(--text-faint); }

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .highlight-grid { grid-template-columns: 1fr; }
}

@media (max-width: 800px) {
  .layout { flex-direction: column; }

  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    box-shadow: 2px 0 18px rgba(0,0,0,0.3);
  }
  .sidebar.open {
    transform: translateX(0);
  }

  .nav-toggle {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    position: sticky;
    top: 0;
    z-index: 30;
    width: 100%;
    background: var(--navy-dark);
    color: #fff;
    border: none;
    padding: 0.9rem 1.25rem;
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
  }
  .nav-toggle .bars {
    font-size: 1.1rem;
    line-height: 1;
  }

  .nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(12, 31, 54, 0.45);
    z-index: 15;
  }
  .nav-overlay.open { display: block; }

  .content-inner { padding: 2rem 1.4rem 1.5rem; }
  .site-footer { padding: 1.2rem 1.4rem 2rem; }
}

@media (max-width: 480px) {
  .avatar { width: 100px; height: 100px; }
  .page-title { font-size: 1.7rem; }
}