/* Ritvik19.github.io — Academic design system */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;

  --color-bg: #fafafa;
  --color-bg-elevated: #ffffff;
  --color-bg-muted: #f0f0f0;
  --color-text: #1a1a1a;
  --color-text-muted: #5c5c5c;
  --color-text-subtle: #8a8a8a;
  --color-border: #e0e0e0;
  --color-border-strong: #c8c8c8;
  --color-accent: #1a56db;
  --color-accent-hover: #1348b8;
  --color-accent-muted: rgba(26, 86, 219, 0.1);
  --color-link: #1a56db;
  --color-link-hover: #1348b8;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);

  --max-width: 1100px;
  --sidebar-width: 220px;

  --transition: 0.2s ease;
}

html.dark {
  --color-bg: #121212;
  --color-bg-elevated: #1e1e1e;
  --color-bg-muted: #2a2a2a;
  --color-text: #e8e8e8;
  --color-text-muted: #a8a8a8;
  --color-text-subtle: #787878;
  --color-border: #333333;
  --color-border-strong: #444444;
  --color-accent: #5b8def;
  --color-accent-hover: #7aa3f5;
  --color-accent-muted: rgba(91, 141, 239, 0.15);
  --color-link: #7aa3f5;
  --color-link-hover: #9bb8f7;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

/* Home page content — navbar stays edge-to-edge */
.site-header + main {
  padding: var(--space-2xl);
}

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

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

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-md);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text);
}

h1 { font-size: 2.25rem; font-weight: 700; }
h2 { font-size: 1.5rem; margin-top: var(--space-2xl); padding-bottom: var(--space-sm); border-bottom: 1px solid var(--color-border); }
h3 { font-size: 1.2rem; }
h4 { font-size: 1.05rem; }

p {
  margin: 0 0 var(--space-md);
  color: var(--color-text-muted);
}

ul, ol {
  margin: 0 0 var(--space-md);
  padding-left: 1.5rem;
  color: var(--color-text-muted);
}

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

code, pre {
  font-family: var(--font-mono);
  font-size: 0.875em;
}

pre {
  background: var(--color-bg-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  overflow-x: auto;
  margin: var(--space-md) 0;
}

pre code {
  background: none;
  padding: 0;
}

code {
  background: var(--color-bg-muted);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
}

/* Layout */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(8px);
}

.site-header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-sm) var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

/* Full-width gutters — home, papers, documentation (aligned nav + content) */
.site-header:has(+ .container--papers) .site-header-inner,
.site-header:has(+ main) .site-header-inner,
.site-header:has(+ .container:not(.container--papers)) .site-header-inner {
  max-width: none;
  padding: var(--space-sm) var(--space-xl);
}

.site-logo {
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-text);
  text-decoration: none;
}

.site-logo:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  text-decoration: none;
}

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

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

.container--papers,
main .container,
.site-header + .container:not(.container--papers) {
  max-width: none;
  padding-left: var(--space-xl);
  padding-right: var(--space-xl);
}

.container--papers .docs-layout,
.site-header + .container:not(.container--papers) .docs-layout {
  gap: var(--space-lg);
}

.section {
  padding: var(--space-2xl) 0;
}

.section:first-of-type {
  padding-top: var(--space-xl);
}

/* Hero */
.hero {
  padding: var(--space-3xl) 0 var(--space-2xl);
  text-align: center;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 2.75rem);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.02em;
}

.hero .tagline {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
  font-weight: 400;
}

.hero .bio {
  max-width: 36rem;
  margin: 0 auto var(--space-xl);
  font-size: 1.05rem;
}

/* Social links */
.social-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
  margin: var(--space-lg) 0;
}

.social-links a.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--color-bg-muted);
  border: 1px solid var(--color-border);
  transition: background var(--transition), border-color var(--transition);
}

.social-links a.social-link::before {
  content: '';
  display: block;
  width: 20px;
  height: 20px;
  background-color: var(--color-text-muted);
  -webkit-mask-image: var(--social-icon);
  mask-image: var(--social-icon);
  -webkit-mask-size: contain;
  mask-size: contain;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-position: center;
  mask-position: center;
  transition: background-color var(--transition);
}

.social-link--gmail { --social-icon: url('https://cdn.jsdelivr.net/npm/simple-icons@13/icons/gmail.svg'); }
.social-link--linkedin { --social-icon: url('https://cdn.jsdelivr.net/npm/simple-icons@13/icons/linkedin.svg'); }
.social-link--huggingface { --social-icon: url('https://cdn.jsdelivr.net/npm/simple-icons@13/icons/huggingface.svg'); }
.social-link--github { --social-icon: url('https://cdn.jsdelivr.net/npm/simple-icons@13/icons/github.svg'); }
.social-link--medium { --social-icon: url('https://cdn.jsdelivr.net/npm/simple-icons@13/icons/medium.svg'); }

.social-links a.social-link:hover {
  background: var(--color-accent-muted);
  border-color: var(--color-accent);
  text-decoration: none;
}

.social-links a.social-link:hover::before {
  background-color: var(--color-accent);
}

/* Skills chips */
.chip-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.chip {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: 999px;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-lg);
}

.card {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition), border-color var(--transition);
}

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

.card-title {
  font-size: 1.1rem;
  margin: 0 0 var(--space-sm);
}

.card-body {
  flex: 1;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.card-footer {
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

/* Publication / research entries */
.publication-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.publication-item {
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}

.publication-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.publication-item h3 {
  margin-bottom: var(--space-xs);
}

.publication-item .meta {
  font-size: 0.875rem;
  color: var(--color-text-subtle);
  margin-bottom: var(--space-sm);
}

.publication-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 0.9rem;
  font-size: 0.875rem;
  font-weight: 500;
  font-family: inherit;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
  color: var(--color-text);
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.btn:hover {
  background: var(--color-bg-muted);
  text-decoration: none;
  color: var(--color-text);
}

.btn-primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--color-link);
}

.btn-ghost:hover {
  background: var(--color-accent-muted);
  color: var(--color-link-hover);
}

/* Badges / tags */
.badge {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-bg-muted);
  border-radius: var(--radius-sm);
  margin: 0.15rem 0.25rem 0.15rem 0;
}

.tags {
  margin-top: var(--space-sm);
}

/* Docs layout */
.docs-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  gap: var(--space-2xl);
  align-items: start;
  padding: var(--space-xl) 0 var(--space-3xl);
}

.docs-sidebar {
  position: sticky;
  top: 5rem;
  max-height: calc(100vh - 6rem);
  overflow-y: auto;
}

.docs-sidebar .nav {
  list-style: none;
  margin: 0;
  padding: 0;
}

.docs-sidebar .nav > li {
  margin-bottom: var(--space-xs);
}

.docs-sidebar .nav a {
  display: block;
  padding: 0.35rem 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  padding-left: var(--space-md);
  margin-left: calc(-1 * var(--space-md));
}

.docs-sidebar .nav a:hover,
.docs-sidebar .nav a.active {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
}

.docs-sidebar .nav .nav {
  padding-left: var(--space-md);
}

.docs-sidebar .nav .nav a {
  font-size: 0.85rem;
}

.docs-main {
  min-width: 0;
}

.docs-heading {
  padding: var(--space-2xl) 0 var(--space-lg);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-xl);
}

.docs-heading h1 {
  margin-bottom: var(--space-sm);
}

.docs-heading .lead {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  margin: 0;
}

/* Tables */
.table-wrap {
  overflow-x: auto;
  margin: var(--space-md) 0;
}

table.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

table.data-table th,
table.data-table td {
  padding: 0.65rem 0.85rem;
  text-align: left;
  border: 1px solid var(--color-border);
}

table.data-table th {
  background: var(--color-bg-muted);
  font-weight: 600;
  color: var(--color-text);
}

table.data-table tbody tr:nth-child(even) {
  background: var(--color-bg-muted);
}

/* Search bar */
.search-bar {
  margin-bottom: var(--space-xl);
}

.search-bar input {
  width: 100%;
  max-width: 400px;
  padding: 0.6rem 1rem;
  font-size: 1rem;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-elevated);
  color: var(--color-text);
}

.search-bar input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-muted);
}

/* Paper cards grid */
.paper-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-md);
}

.container--papers .paper-grid {
  display: block;
  position: relative;
  gap: var(--space-md);
}

.container--papers .paper-grid .paper-card {
  box-sizing: border-box;
}

.paper-card .card-footer img {
  display: block;
  height: 20px;
}

.paper-card .card-footer a:hover {
  text-decoration: none;
  opacity: 0.85;
}

.paper-card {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
}

.container--papers .paper-card {
  padding: var(--space-sm) var(--space-md);
  height: auto;
}

.container--papers .paper-card .card-text {
  flex: none;
}

.paper-card h3 {
  font-size: 1rem;
  margin-bottom: var(--space-sm);
  border: none;
  padding: 0;
}

.paper-card .card-text {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  flex: 1;
  margin-bottom: var(--space-md);
}

.paper-card .card-footer {
  margin-top: auto;
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
}

/* Project page (research) */
.project-hero {
  text-align: center;
  padding: var(--space-3xl) var(--space-xl) var(--space-2xl);
  background: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
}

.project-hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  margin-bottom: var(--space-md);
  border: none;
}

.project-hero .authors {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.project-hero .date {
  font-size: 0.9rem;
  color: var(--color-text-subtle);
  margin-bottom: var(--space-lg);
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
}

.project-section {
  padding: var(--space-2xl) var(--space-xl);
}

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

.project-section-inner {
  max-width: 720px;
  margin: 0 auto;
}

.project-section h2 {
  margin-top: 0;
  border: none;
  padding: 0;
}

.project-section .content {
  text-align: justify;
}

.project-section figure {
  margin: var(--space-lg) 0;
  text-align: center;
}

.project-section figure img {
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

/* Carousel (CSS scroll-snap) */
.carousel-scroll {
  display: flex;
  gap: var(--space-lg);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: var(--space-md) 0;
  -webkit-overflow-scrolling: touch;
}

.carousel-scroll .carousel-item {
  flex: 0 0 auto;
  scroll-snap-align: start;
  min-width: 280px;
  text-align: center;
}

.carousel-scroll .carousel-item img {
  max-height: 320px;
  border-radius: var(--radius-md);
}

.carousel-scroll .carousel-caption {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-top: var(--space-sm);
}

/* Footer */
.site-footer {
  margin-top: var(--space-3xl);
  padding: var(--space-xl);
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-text-subtle);
}

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

/* Theme toggle */
#mode {
  cursor: pointer;
  position: fixed;
  right: var(--space-xl);
  top: var(--space-sm);
  z-index: 200;
  border-radius: var(--radius-md);
  line-height: 0;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

#mode svg {
  width: 20px;
  padding: 12px;
  box-sizing: content-box;
  color: var(--color-text);
}

html.dark #mode .light { display: none; }
html:not(.dark) #mode .dark { display: none; }
html #mode .light { display: block; }
html.dark #mode .dark { display: block; }

/* Scroll to top */
#scrollTop {
  display: none;
  position: fixed;
  z-index: 150;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-bg-elevated);
  color: var(--color-text);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  box-shadow: var(--shadow-md);
  transition: background var(--transition);
}

#scrollTop:hover {
  background: var(--color-bg-muted);
}

#scrollTop.visible {
  display: flex;
}

.usage-block {
  margin-bottom: var(--space-xl);
}

.usage-block h3 {
  font-size: 1.1rem;
  margin-top: var(--space-lg);
  border: none;
  padding: 0;
}

ol.reference {
  padding-left: 1.5rem;
}

/* Mind map page */
.mindmap-header {
  padding: var(--space-md) var(--space-xl);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.mindmap-header h1 {
  font-size: 1.25rem;
  margin: 0;
  border: none;
}

#mindmap {
  width: 100%;
  height: calc(100vh - 60px);
}

/* Syntax highlighter overrides */
.syntaxhighlighter {
  background-color: var(--color-bg-muted) !important;
  border: 1px solid var(--color-border) !important;
  border-radius: var(--radius-md) !important;
  padding: var(--space-md) 0 !important;
  margin: var(--space-md) 0 !important;
}

/* Responsive */
@media (max-width: 900px) {
  .docs-layout {
    grid-template-columns: 1fr;
  }

  .docs-sidebar {
    position: static;
    max-height: none;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--space-lg);
  }

  .docs-sidebar .nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
  }

  .docs-sidebar .nav a {
    border-left: none;
    padding: 0.35rem 0.75rem;
    background: var(--color-bg-muted);
    border-radius: var(--radius-md);
    margin-left: 0;
  }

  .site-header-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 600px) {
  .site-header + main {
    padding: var(--space-lg);
  }

  .container {
    padding: 0 var(--space-md);
  }

  .container--papers,
  main .container,
  .site-header + .container:not(.container--papers) {
    padding-left: var(--space-md);
    padding-right: var(--space-md);
  }

  .site-header:has(+ .container--papers) .site-header-inner,
  .site-header:has(+ main) .site-header-inner,
  .site-header:has(+ .container:not(.container--papers)) .site-header-inner {
    padding-left: var(--space-md);
    padding-right: var(--space-md);
  }

  #mode {
    right: var(--space-md);
  }

  .card-grid,
  .paper-grid {
    grid-template-columns: 1fr;
  }
}