/* ============================================
   Sidebar Layout - Light Theme
   Personal Academic Website - Ankush Desai
   ============================================ */

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fb;
  --bg-sidebar: #ffffff;
  --bg-card: #ffffff;
  --border: #e2e6ea;
  --border-hover: #c0c8d0;
  --text-primary: #1a1a2e;
  --text-secondary: #3d3d5c;
  --text-muted: #6b7280;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-subtle: rgba(37, 99, 235, 0.06);
  --accent-light: #dbeafe;
  --font-sans: 'Source Sans 3', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Source Serif 4', 'Georgia', 'Times New Roman', serif;
  --sidebar-width: 280px;
  --transition: 0.2s ease;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.08);
}

html {
  scroll-behavior: smooth;
  font-size: 17px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  letter-spacing: -0.01em;
}

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

a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
}

/* --- Typography --- */
h1, h2, h3, h4 {
  color: var(--text-primary);
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.02em;
}

h1 { font-size: 2.1rem; }
h2 { font-size: 1.4rem; margin-bottom: 1.25rem; }
h3 { font-size: 1.05rem; font-family: var(--font-sans); font-weight: 600; }
h4 { font-size: 0.95rem; font-family: var(--font-sans); }

p { margin-bottom: 1rem; }

/* --- Sidebar Layout --- */
.site-wrapper {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  z-index: 100;
}

.sidebar-inner {
  padding: 2.5rem 1.75rem 2rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.sidebar-photo {
  text-align: center;
  margin-bottom: 1.25rem;
}

.sidebar-photo img {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--border);
  box-shadow: var(--shadow-md);
  transition: border-color var(--transition);
}

.sidebar-photo img:hover {
  border-color: var(--accent);
}

.sidebar-identity {
  text-align: center;
  margin-bottom: 1.5rem;
}

.sidebar-name {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 0.2rem;
  line-height: 1.3;
}

.sidebar-title {
  color: var(--accent);
  font-size: 0.88rem;
  font-weight: 500;
  line-height: 1.4;
}

/* Sidebar Navigation */
.sidebar-nav {
  margin-bottom: 1.5rem;
}

.sidebar-nav ul {
  list-style: none;
}

.sidebar-nav li {
  margin-bottom: 0.15rem;
}

.sidebar-nav a {
  display: block;
  padding: 0.45rem 0.75rem;
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 500;
  border-radius: 6px;
  transition: color var(--transition), background var(--transition);
  text-decoration: none;
}

.sidebar-nav a:hover {
  color: var(--text-primary);
  background: var(--bg-secondary);
  text-decoration: none;
}

.sidebar-nav a.active {
  color: var(--accent);
  background: var(--accent-subtle);
  font-weight: 600;
}

/* Sidebar Social Links */
.sidebar-links {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin-top: auto;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.sidebar-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.25rem 0;
  transition: color var(--transition);
  text-decoration: none;
}

.sidebar-links a:hover {
  color: var(--accent);
  text-decoration: none;
}

.sidebar-links a i,
.sidebar-links a svg {
  font-size: 0.95rem;
  width: 1.1rem;
  text-align: center;
}

/* --- Main Content --- */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 2.5rem 3rem 4rem;
  max-width: calc(100% - var(--sidebar-width));
}

.content-container {
  max-width: 720px;
}

/* --- Mobile Toggle --- */
.mobile-header {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 56px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 200;
  align-items: center;
  padding: 0 1.25rem;
  justify-content: space-between;
}

.mobile-brand {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}

.mobile-brand:hover {
  color: var(--accent);
  text-decoration: none;
}

.sidebar-toggle {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.35rem;
  cursor: pointer;
  padding: 0.25rem;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 90;
}

/* --- Section --- */
.section {
  margin-bottom: 2.5rem;
}

.section-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--border);
}

/* --- Cards --- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 0.75rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow-sm);
}

.card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.card h3 a {
  color: var(--text-primary);
}

.card h3 a:hover {
  color: var(--accent);
  text-decoration: none;
}

/* --- Hero (index.html) --- */
.hero-bio {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.8;
}

.hero-bio p {
  margin-bottom: 0.85rem;
}

/* --- Publications --- */
.pub-list {
  list-style: none;
}

.pub-item {
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--border);
}

.pub-item:last-child {
  border-bottom: none;
}

.pub-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.3rem;
  line-height: 1.45;
}

.pub-title a {
  color: var(--text-primary);
  text-decoration: none;
}

.pub-title a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.pub-authors {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.2rem;
}

.pub-authors .me {
  font-weight: 600;
  color: var(--text-primary);
}

.pub-venue {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-style: italic;
}

.pub-venue strong {
  font-style: normal;
  color: var(--text-secondary);
}

.pub-links {
  margin-top: 0.45rem;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.pub-links a {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-subtle);
  padding: 0.15rem 0.55rem;
  border-radius: 4px;
  transition: background var(--transition);
  text-decoration: none;
}

.pub-links a:hover {
  background: var(--accent-light);
  text-decoration: none;
}

.pub-year-heading {
  font-size: 1rem;
  font-weight: 700;
  font-family: var(--font-sans);
  color: var(--accent);
  margin: 1.75rem 0 0.5rem;
  padding-bottom: 0.2rem;
}

.pub-year-heading:first-child {
  margin-top: 0;
}

/* --- Timeline (Experience) --- */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding-bottom: 2rem;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2rem;
  top: 0.45rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg-secondary);
  transform: translateX(-4px);
}

.timeline-role {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.timeline-company {
  color: var(--accent);
  font-weight: 500;
}

.timeline-date {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
}

.timeline-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-top: 0.3rem;
  line-height: 1.7;
}

/* --- Projects --- */
.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 1rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow-sm);
}

.project-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.project-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

.project-subtitle {
  font-size: 0.88rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 0.65rem;
}

.project-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 0.65rem;
  line-height: 1.7;
}

.project-impact {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.project-impact strong {
  color: var(--text-secondary);
}

.project-links {
  margin-top: 0.75rem;
  display: flex;
  gap: 0.75rem;
}

.project-links a {
  font-size: 0.85rem;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  text-decoration: none;
}

.project-links a:hover {
  text-decoration: underline;
}

/* --- Education --- */
.edu-item {
  margin-bottom: 1.5rem;
}

.edu-school {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.edu-degree {
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.edu-date {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.edu-details {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
  line-height: 1.65;
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.82rem;
  margin-left: var(--sidebar-width);
}

/* --- Responsive --- */
@media (max-width: 900px) {
  html { font-size: 16px; }

  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    box-shadow: none;
    z-index: 300;
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 20px rgba(0,0,0,0.1);
  }

  .sidebar-overlay.active {
    display: block;
  }

  .mobile-header {
    display: flex;
  }

  .main-content {
    margin-left: 0;
    max-width: 100%;
    padding: 56px 1.5rem 4rem;
    padding-top: calc(56px + 1.5rem);
  }

  .content-container {
    max-width: 100%;
  }

  .footer {
    margin-left: 0;
  }
}

@media (max-width: 480px) {
  .main-content {
    padding: calc(56px + 1rem) 1.25rem 3rem;
  }

  h1 { font-size: 1.45rem; }

  .sidebar-photo img {
    width: 110px;
    height: 110px;
  }
}