/* research.chaitanya.science */

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

:root {
  --text: #333;
  --secondary: #555;
  --muted: #999;
  --border: #eee;
  --link: #06c;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', monospace;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.55;
  color: var(--text);
  background: #fff;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 20px;
}

/* --- Nav --- */

.site-nav {
  padding: 20px 0;
}

.site-nav .container {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
}

.site-nav__brand {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

.site-nav__brand:hover { text-decoration: none; }

.site-nav__brand span {
  font-weight: 400;
  color: var(--muted);
}

.site-nav__links {
  display: flex;
  list-style: none;
  gap: 20px;
}

.site-nav__links a {
  font-size: 15px;
  color: var(--muted);
}

.site-nav__links a:hover,
.site-nav__links a.active {
  color: var(--text);
  text-decoration: none;
}

hr {
  border: none;
  height: 1px;
  background: var(--border);
}

/* --- Main --- */

main {
  flex: 1;
  padding: 28px 0 60px;
}

h1 {
  font-size: 28px;
  font-weight: 400;
  margin-bottom: 6px;
}

h2 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 10px;
}

p { margin-bottom: 12px; }

.page-header {
  margin-bottom: 28px;
}

.page-header .subtitle {
  color: var(--muted);
  font-size: 15px;
  font-style: italic;
}

/* --- Paper List --- */

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

.paper-entry {
  border-left: 3px solid #ddd;
  padding: 2px 0 2px 14px;
  margin-bottom: 20px;
}

.paper-entry:hover {
  border-left-color: var(--link);
}

.paper-entry__title {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 2px;
}

.paper-entry__title a { color: var(--text); }
.paper-entry__title a:hover { color: var(--link); text-decoration: none; }

.paper-entry__meta {
  font-size: 12px;
  color: var(--muted);
  font-family: var(--mono);
  margin-bottom: 6px;
}

.paper-entry__abstract {
  font-size: 14px;
  color: var(--secondary);
  line-height: 1.55;
  margin-bottom: 4px;
}

.paper-entry__link {
  font-size: 13px;
}

/* --- About --- */

.about-content {
  max-width: 680px;
  line-height: 1.6;
}

.about-content p {
  color: var(--secondary);
  font-size: 15px;
}

.about-content h2 {
  margin-top: 24px;
}

.about-content ul {
  padding-left: 18px;
  margin-bottom: 12px;
}

.about-content ul li {
  color: var(--secondary);
  font-size: 15px;
  margin-bottom: 3px;
}

.org-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  margin: 12px 0 24px;
}

.org-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--secondary);
}

.org-badge__icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  color: var(--muted);
}

/* --- Contact --- */

.contact-content {
  max-width: 480px;
}

.contact-list {
  list-style: none;
}

.contact-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-size: 15px;
}

.contact-list li:last-child {
  border-bottom: none;
}

.contact-list__icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  color: var(--muted);
}

.contact-list__label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
  min-width: 54px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* --- Paper Viewer --- */

.paper-viewer__back {
  display: inline-block;
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 16px;
}

.paper-viewer__back::before {
  content: '\2190 ';
}

.paper-viewer__back:hover {
  color: var(--text);
  text-decoration: none;
}

.paper-viewer__header {
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.paper-viewer__header h1 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 4px;
}

.paper-viewer__header .meta {
  font-size: 13px;
  color: var(--muted);
  font-family: var(--mono);
}

.paper-viewer__actions {
  display: flex;
  gap: 10px;
  margin-bottom: 28px;
}

.paper-viewer__btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  font-size: 14px;
  font-weight: 500;
  color: #fff;
  background: var(--text);
  border: 1px solid var(--text);
  border-radius: 4px;
  transition: background 0.15s, color 0.15s;
}

.paper-viewer__btn:hover {
  background: #000;
  text-decoration: none;
  color: #fff;
}

.paper-viewer__btn--secondary {
  color: var(--muted);
  background: transparent;
  border-color: var(--border);
  font-size: 13px;
  padding: 8px 14px;
}

.paper-viewer__btn--secondary:hover {
  background: #f8f8f8;
  color: var(--secondary);
  border-color: #ccc;
}

.paper-viewer__body h2 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
  margin-top: 24px;
}

.paper-viewer__body h2:first-child {
  margin-top: 0;
}

.paper-viewer__body p {
  font-size: 15px;
  color: var(--secondary);
  line-height: 1.65;
  margin-bottom: 10px;
}

.paper-viewer__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.paper-viewer__tags span {
  font-size: 12px;
  font-family: var(--mono);
  color: var(--muted);
  background: #f5f5f5;
  padding: 2px 8px;
  border-radius: 3px;
}

/* --- Footer --- */

.site-footer {
  padding: 20px 0;
  text-align: center;
  font-size: 12px;
  color: var(--muted);
}

/* --- Responsive --- */

@media (max-width: 600px) {
  h1 { font-size: 24px; }
  .site-nav__links { gap: 14px; }
  .paper-entry__abstract { font-size: 13px; }
}

/* --- Print --- */

@media print {
  .site-nav,
  .site-footer,
  .paper-viewer__back {
    display: none;
  }
  body { background: white; }
}