/* --- 1. VARIABLES & THEME --- */
:root {
  /* Dark Mode - Warm, muted tones */
  --bg-body: #1c1b1a;
  --bg-card: #252422;
  --text-main: #e8e4df;
  --text-muted: #9a9590;
  --text-light: #b8b2aa;
  --panel-bg: #141312;
  --accent: #c9785d;
  --accent-hover: #e08b6d;
  --line: #3a3836;
  --line-light: #2d2b29;
  --shadow: rgba(0, 0, 0, 0.4);
  --font-serif: "Lora", Georgia, serif;
  --font-sans: "Inter", sans-serif;
  --font-mono: "Fira Code", "Consolas", monospace;

  /* Grain overlay */
  --grain-opacity: 0.03;
}

[data-theme="light"] {
  /* Light Mode - Warm paper tones */
  --bg-body: #f5f1eb;
  --bg-card: #fffdf9;
  --text-main: #2d2a26;
  --text-muted: #6b635a;
  --text-light: #524d47;
  --panel-bg: #1c1b1a;
  --accent: #b85a3c;
  --accent-hover: #9a4a30;
  --line: #e0dbd4;
  --line-light: #eae6e0;
  --shadow: rgba(45, 42, 38, 0.08);

  --grain-opacity: 0.025;
}

/* --- 2. BASE RESET --- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

/* Paper grain texture overlay */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
  opacity: var(--grain-opacity);
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%' height='100%' filter='url(%23noise)'/%3E%3C/svg%3E");
}

body {
  background-color: var(--bg-body);
  color: var(--text-main);
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.85;
  transition: background-color 0.3s, color 0.3s;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Improve text rendering */
p,
li,
span {
  text-rendering: optimizeLegibility;
}

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

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

::selection {
  background: var(--accent);
  color: #fff;
}

/* ...existing code... */

/* --- 3. MENU BUTTON --- */
.menu-btn {
  position: fixed;
  top: 30px;
  left: 30px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  color: var(--text-main);
  font-family: var(--font-sans);
  cursor: pointer;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  padding: 10px 16px;
  border-radius: 6px;
  box-shadow: 0 2px 8px var(--shadow);
  transition: all 0.2s;
}

.menu-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* --- 4. SIDE PANEL (The Drawer) --- */
.side-panel {
  position: fixed;
  top: 0;
  left: 0;
  width: 300px;
  height: 100vh;
  background: var(--panel-bg);
  color: #e0e0e0;
  padding: 60px 40px;
  transform: translateX(-100%);
  transition: transform 0.4s cubic-bezier(0.25, 1, 0.5, 1);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  box-shadow: 5px 0 30px rgba(0, 0, 0, 0.5);
  overflow-y: auto;
}

.side-panel.open {
  transform: translateX(0);
}

.close-btn {
  position: absolute;
  top: 25px;
  right: 25px;
  background: none;
  border: none;
  color: #666;
  font-size: 1.3rem;
  cursor: pointer;
  padding: 5px;
  transition: color 0.2s;
}

.close-btn:hover {
  color: #fff;
}

.panel-header h1 {
  font-family: var(--font-sans);
  font-size: 1.8rem;
  font-weight: 600;
  color: #fff;
}

.role {
  font-family: var(--font-sans);
  color: #888;
  font-size: 0.9rem;
  margin-top: 5px;
}

.panel-links {
  list-style: none;
  margin-top: 50px;
  flex-grow: 1;
}

.panel-links li {
  margin-bottom: 20px;
}

.nav-link {
  font-family: var(--font-sans);
  color: #888;
  font-size: 0.95rem;
  display: block;
  padding: 8px 0;
  transition: all 0.2s;
}

.nav-link:hover {
  color: #fff;
  padding-left: 8px;
}

.theme-btn-outlined {
  width: 100%;
  padding: 12px;
  background: transparent;
  border: 1px solid #444;
  color: #ccc;
  border-radius: 6px;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  display: flex;
  justify-content: center;
  gap: 10px;
  transition: all 0.2s;
}

.theme-btn-outlined:hover {
  border-color: #888;
  background: rgba(255, 255, 255, 0.05);
  color: #fff;
}

.panel-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
  z-index: 999;
}

.panel-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* --- 5. MAIN CONTENT AREA --- */
#main-content {
  max-width: 750px;
  margin: 0 auto;
  padding: 100px 30px 60px;
}

/* --- 6. CHAPTERS --- */
.chapter {
  margin-bottom: 30px;
}

.chapter-number {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent);
  display: block;
  margin-bottom: 8px;
}

.chapter-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 25px;
  color: var(--text-main);
}

.lead-text {
  font-size: 1.15rem;
  color: var(--text-light);
  margin-bottom: 1rem;
}

.section-divider {
  border: none;
  border-top: 1px solid var(--line);
  margin: 50px 0;
}

/* --- 7. PAPER ENTRIES (INDEX PAGE) --- */
.paper-entry {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 2rem;
  margin-bottom: 1.5rem;
  transition: all 0.3s ease;
}

.paper-entry:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px var(--shadow);
  transform: translateY(-2px);
}

.paper-entry h1 {
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.paper-title-link {
  color: var(--text-main);
  transition: color 0.2s;
}

.paper-title-link:hover {
  color: var(--accent);
}

.paper-entry > p:first-of-type {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.paper-content {
  position: relative;
  max-height: 120px;
  overflow: hidden;
  margin-bottom: 1rem;
}

.paper-content::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: linear-gradient(transparent, var(--bg-card));
  pointer-events: none;
}

.paper-content p {
  font-size: 0.95rem;
  color: var(--text-light);
  margin-bottom: 0.75rem;
}

.read-more {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--accent);
  display: inline-block;
  margin-top: 0.5rem;
}

.read-more:hover {
  color: var(--accent-hover);
}

/* --- 8. PAPERS CONTROLS --- */
.papers-controls {
  text-align: center;
  margin-top: 2rem;
}

.btn-text {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--accent);
  background: none;
  border: 1px solid var(--accent);
  padding: 10px 24px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-text:hover {
  background: var(--accent);
  color: white;
}

/* --- 9. PAGINATION --- */
.pagination-container {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.page-btn {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  padding: 8px 14px;
  border: 1px solid var(--line);
  background: var(--bg-card);
  color: var(--text-main);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
}

.page-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.page-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.page-dots {
  color: var(--text-muted);
  padding: 0 5px;
}

/* --- 10. PAPER FULL PAGE --- */
.paper-full {
  max-width: 750px;
  margin: 0 auto;
  padding: 2rem;
}

.paper-full h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.paper-full > p:first-of-type {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--line);
}

.paper-full h2 {
  font-size: 1.4rem;
  margin: 2rem 0 1rem;
  color: var(--text-main);
}

.paper-full p {
  margin-bottom: 1.25rem;
  color: var(--text-light);
}

.paper-full ul,
.paper-full ol {
  margin: 1rem 0 1.5rem 1.5rem;
  color: var(--text-light);
}

.paper-full li {
  margin-bottom: 0.5rem;
}

.paper-full strong {
  color: var(--text-main);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--text-muted);
  padding: 1.5rem 2rem;
  transition: color 0.2s;
}

.back-link:hover {
  color: var(--accent);
}

/* --- 11. TAGS --- */
.tags-container {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 1.5rem;
}

.tag {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  padding: 4px 12px;
  background: var(--line-light);
  border: 1px solid var(--line);
  border-radius: 20px;
  color: var(--text-muted);
  transition: all 0.2s;
}

.tag:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* --- 12. PUBLICATION BUTTON --- */
.btn-wrapper {
  text-align: center;
  margin: 2rem 0;
}

.publication-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  padding: 12px 28px;
  background: var(--accent);
  color: white;
  border-radius: 6px;
  transition: all 0.2s;
}

.publication-btn:hover {
  background: var(--accent-hover);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(183, 75, 75, 0.3);
}

/* --- 13. TIMELINE --- */
.timeline-list {
  list-style: none;
  border-left: 2px solid var(--line);
  padding-left: 25px;
  margin-left: 10px;
}

.timeline-list li {
  position: relative;
  margin-bottom: 25px;
}

.timeline-list li::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-body);
  border: 2px solid var(--accent);
}

.year {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--accent);
  display: block;
  margin-bottom: 3px;
}

/* --- 14. TECH LIST --- */
.tech-list {
  list-style: none;
  margin-top: 1rem;
}

.tech-list li {
  margin-bottom: 10px;
  color: var(--text-light);
}

/* --- 15. CONTACT --- */
.contact-email {
  margin-top: 1rem;
}

.contact-email a {
  font-family: var(--font-mono);
  font-size: 1rem;
}

/* --- 16. KATEX OVERRIDES --- */
.katex-display {
  margin: 1.5rem 0;
  overflow-x: auto;
  overflow-y: hidden;
}

/* --- SEARCH BAR --- */
.search-container {
  position: relative;
  margin-bottom: 1.5rem;
  max-width: 400px;
}

.search-container input {
  width: 100%;
  padding: 12px 40px 12px 45px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text-main);
  transition: all 0.2s;
}

.search-container input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(183, 75, 75, 0.1);
}

.search-container input::placeholder {
  color: var(--text-muted);
}

.search-icon {
  position: absolute;
  left: 15px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.clear-search {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all 0.2s;
}

.clear-search:hover {
  color: var(--text-main);
  background: var(--line);
}

/* --- PAPER COUNT --- */
.paper-count {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

/* --- SKELETON LOADER --- */
.skeleton-container {
  display: none;
}

.skeleton-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 2rem;
  margin-bottom: 1.5rem;
}

.skeleton {
  background: linear-gradient(
    90deg,
    var(--line-light) 25%,
    var(--line) 50%,
    var(--line-light) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 4px;
}

.skeleton-title {
  height: 28px;
  width: 70%;
  margin-bottom: 1rem;
}

.skeleton-meta {
  height: 16px;
  width: 40%;
  margin-bottom: 1.5rem;
}

.skeleton-text {
  height: 14px;
  width: 100%;
  margin-bottom: 0.75rem;
}

.skeleton-text.short {
  width: 60%;
}

@keyframes shimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* --- NO RESULTS --- */
.no-results {
  text-align: center;
  padding: 3rem;
  color: var(--text-muted);
  font-style: italic;
}

/* --- READING TIME --- */
.reading-time {
  color: var(--text-muted);
  font-size: 0.85em;
  margin-left: 0.5rem;
}

.reading-time i {
  margin-right: 4px;
}

/* --- BACK TO TOP BUTTON --- */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 45px;
  height: 45px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s;
  box-shadow: 0 4px 15px rgba(183, 75, 75, 0.3);
  z-index: 100;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--accent-hover);
  transform: translateY(-3px);
}

/* --- ERROR CONTAINER --- */
.error-container {
  text-align: center;
  padding: 3rem;
  color: var(--text-muted);
}

.error-container i {
  font-size: 3rem;
  color: var(--accent);
  margin-bottom: 1rem;
  display: block;
}

.error-container code {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.5rem 1rem;
  background: var(--bg-card);
  border-radius: 4px;
  font-family: var(--font-mono);
}

.paper-error {
  background: rgba(183, 75, 75, 0.1);
  border-color: var(--accent);
}

.paper-error p {
  color: var(--accent);
  margin: 0;
}

/* --- READING PROGRESS BAR --- */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--accent);
  width: 0%;
  z-index: 9999;
  transition: width 0.1s;
}

/* --- PAPER HEADER (paper.html) --- */
.paper-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
  position: sticky;
  top: 0;
  background: var(--bg-body);
  border-bottom: 1px solid var(--line);
  z-index: 100;
}

.paper-header .back-link {
  padding: 0;
}

.paper-actions {
  display: flex;
  gap: 0.5rem;
}

.action-btn {
  background: var(--bg-card);
  border: 1px solid var(--line);
  color: var(--text-main);
  padding: 8px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s;
}

.action-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.action-btn span {
  display: none;
}

@media (min-width: 600px) {
  .action-btn span {
    display: inline;
  }
}

/* --- SHARE DROPDOWN --- */
.share-dropdown {
  position: fixed;
  top: 70px;
  right: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 4px 20px var(--shadow);
  padding: 0.5rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.2s;
  z-index: 200;
}

.share-dropdown.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.share-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  cursor: pointer;
  border-radius: 4px;
  transition: all 0.2s;
  text-decoration: none;
}

.share-option:hover {
  background: var(--line-light);
  color: var(--accent);
}

/* --- TOAST NOTIFICATION --- */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--bg-card);
  color: var(--text-main);
  padding: 12px 24px;
  border-radius: 8px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  box-shadow: 0 4px 20px var(--shadow);
  border: 1px solid var(--line);
  opacity: 0;
  transition: all 0.3s;
  z-index: 9999;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* --- LOADING SPINNER --- */
.paper-loading {
  text-align: center;
  padding: 4rem;
  color: var(--text-muted);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--line);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1rem;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* --- PRINT STYLES --- */
@media print {
  .back-link,
  .paper-header,
  .tags-container,
  .reading-progress,
  .back-to-top,
  .share-dropdown,
  .toast,
  .btn-wrapper {
    display: none !important;
  }

  body {
    background: white !important;
    color: black !important;
    font-size: 12pt;
  }

  .paper-full {
    max-width: 100%;
    padding: 0;
    margin: 0;
  }

  .paper-full h1 {
    color: black;
    font-size: 18pt;
  }

  .paper-full p,
  .paper-full li {
    color: black;
  }

  a {
    color: black;
    text-decoration: underline;
  }

  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 10pt;
    color: #666;
  }
}

/* --- RESPONSIVE --- */
@media (max-width: 600px) {
  #main-content {
    padding: 80px 20px 40px;
  }

  .menu-btn {
    top: 20px;
    left: 20px;
    padding: 8px 12px;
  }

  .chapter-title {
    font-size: 1.6rem;
  }

  .paper-entry {
    padding: 1.5rem;
  }

  .paper-entry h1 {
    font-size: 1.2rem;
  }

  .paper-header {
    padding: 1rem;
  }

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

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
  }

  .paper-full {
    padding: 1.5rem;
  }

  .paper-full h1 {
    font-size: 1.6rem;
  }
}

/* --- END OF STYLE.CSS --- */
/* --- 13. TIMELINE (Creative Design) --- */
.timeline-container {
  max-height: 320px;
  overflow-y: auto;
  position: relative;
  padding: 10px 0;

  /* Hide scrollbar but keep functionality */
  -ms-overflow-style: none; /* IE/Edge */
  scrollbar-width: none; /* Firefox */
}

.timeline-container::-webkit-scrollbar {
  display: none; /* Chrome/Safari */
}

/* Fade effect at bottom to hint more content */
.timeline-wrapper {
  position: relative;
}

.timeline-wrapper::after {
  content: "";
  position: absolute;
  bottom: 30px;
  left: 0;
  right: 0;
  height: 60px;
  background: linear-gradient(transparent, var(--bg-body));
  pointer-events: none;
  z-index: 1;
}

.timeline-list {
  list-style: none;
  position: relative;
  padding-left: 0;
  margin-left: 0;
}

/* The vertical line */
.timeline-list::before {
  content: "";
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(
    to bottom,
    var(--accent),
    var(--line) 20%,
    var(--line) 80%,
    transparent
  );
}

.timeline-list li {
  position: relative;
  padding-left: 70px;
  padding-bottom: 30px;
  opacity: 0;
  transform: translateX(-20px);
  animation: fadeInTimeline 0.5s ease forwards;
}

.timeline-list li:nth-child(1) {
  animation-delay: 0.1s;
}
.timeline-list li:nth-child(2) {
  animation-delay: 0.2s;
}
.timeline-list li:nth-child(3) {
  animation-delay: 0.3s;
}
.timeline-list li:nth-child(4) {
  animation-delay: 0.4s;
}
.timeline-list li:nth-child(5) {
  animation-delay: 0.5s;
}
.timeline-list li:nth-child(6) {
  animation-delay: 0.6s;
}

@keyframes fadeInTimeline {
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.timeline-list li:last-child {
  padding-bottom: 10px;
}

/* The dot/node */
.timeline-list li::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 4px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--bg-body);
  border: 3px solid var(--accent);
  box-shadow: 0 0 0 4px var(--bg-body), 0 0 15px rgba(183, 75, 75, 0.3);
  transition: all 0.3s ease;
  z-index: 2;
}

.timeline-list li:hover::before {
  transform: scale(1.3);
  box-shadow: 0 0 0 4px var(--bg-body), 0 0 25px rgba(183, 75, 75, 0.5);
}

/* Inner glow dot */
.timeline-list li::after {
  content: "";
  position: absolute;
  left: 22px;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  z-index: 3;
  transition: all 0.3s ease;
}

.timeline-list li:hover::after {
  background: var(--accent-hover);
}

/* Year badge */
.year {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--bg-card);
  border: 1px solid var(--accent);
  padding: 3px 10px;
  border-radius: 20px;
  display: inline-block;
  margin-bottom: 8px;
  letter-spacing: 1px;
  transition: all 0.3s ease;
}

.timeline-list li:hover .year {
  background: var(--accent);
  color: white;
}

/* Event text */
.timeline-list li p {
  color: var(--text-light);
  font-size: 0.95rem;
  line-height: 1.5;
  margin: 0;
  transition: color 0.3s ease;
}

.timeline-list li:hover p {
  color: var(--text-main);
}

/* Scroll hint */
.timeline-hint {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  opacity: 0.6;
  transition: opacity 0.3s;
}

.timeline-hint:hover {
  opacity: 1;
}

.timeline-hint i {
  animation: bounceDown 1.5s ease infinite;
}

@keyframes bounceDown {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(5px);
  }
}

/* Hide hint when scrolled to bottom */
.timeline-hint.hidden {
  opacity: 0;
  pointer-events: none;
}

/* --- END OF TIMELINE STYLES --- */
/* --- 13. TIMELINE (Creative Design with Drag Scroll) --- */
.timeline-wrapper {
  position: relative;
}

.timeline-wrapper::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: linear-gradient(transparent, var(--bg-body));
  pointer-events: none;
  z-index: 1;
}

.timeline-container {
  max-height: 320px;
  overflow-y: auto;
  position: relative;
  padding: 10px 0;
  cursor: grab;
  user-select: none;

  /* Hide scrollbar */
  -ms-overflow-style: none;
  scrollbar-width: none;
}

.timeline-container::-webkit-scrollbar {
  display: none;
}

.timeline-container.dragging {
  cursor: grabbing;
  scroll-behavior: auto;
}

.timeline-container.dragging .timeline-list li {
  pointer-events: none;
}

.timeline-list {
  list-style: none;
  position: relative;
  padding-left: 0;
  margin-left: 0;
}

/* The vertical line */
.timeline-list::before {
  content: "";
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(
    to bottom,
    var(--accent),
    var(--line) 20%,
    var(--line) 80%,
    transparent
  );
}

.timeline-list li {
  position: relative;
  padding-left: 70px;
  padding-bottom: 30px;
  opacity: 0;
  transform: translateX(-20px);
  animation: fadeInTimeline 0.5s ease forwards;
  transition: transform 0.2s ease;
}

.timeline-list li:nth-child(1) {
  animation-delay: 0.1s;
}
.timeline-list li:nth-child(2) {
  animation-delay: 0.2s;
}
.timeline-list li:nth-child(3) {
  animation-delay: 0.3s;
}
.timeline-list li:nth-child(4) {
  animation-delay: 0.4s;
}
.timeline-list li:nth-child(5) {
  animation-delay: 0.5s;
}
.timeline-list li:nth-child(6) {
  animation-delay: 0.6s;
}

@keyframes fadeInTimeline {
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.timeline-list li:last-child {
  padding-bottom: 10px;
}

/* The dot/node */
.timeline-list li::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 4px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--bg-body);
  border: 3px solid var(--accent);
  box-shadow: 0 0 0 4px var(--bg-body), 0 0 15px rgba(183, 75, 75, 0.3);
  transition: all 0.3s ease;
  z-index: 2;
}

.timeline-list li:hover::before {
  transform: scale(1.3);
  box-shadow: 0 0 0 4px var(--bg-body), 0 0 25px rgba(183, 75, 75, 0.5);
}

/* Inner glow dot */
.timeline-list li::after {
  content: "";
  position: absolute;
  left: 22px;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  z-index: 3;
  transition: all 0.3s ease;
}

.timeline-list li:hover::after {
  background: var(--accent-hover);
}

/* Year badge */
.year {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--bg-card);
  border: 1px solid var(--accent);
  padding: 3px 10px;
  border-radius: 20px;
  display: inline-block;
  margin-bottom: 8px;
  letter-spacing: 1px;
  transition: all 0.3s ease;
}

.timeline-list li:hover .year {
  background: var(--accent);
  color: white;
}

/* Event text */
.timeline-list li p {
  color: var(--text-light);
  font-size: 0.95rem;
  line-height: 1.5;
  margin: 0;
  transition: color 0.3s ease;
}

.timeline-list li:hover p {
  color: var(--text-main);
}

/* Scroll hint */
.timeline-hint {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  opacity: 0.7;
  transition: opacity 0.3s;
}

.timeline-hint:hover {
  opacity: 1;
}

.timeline-hint i {
  animation: grabPulse 1.5s ease infinite;
}

@keyframes grabPulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.2);
  }
}

.timeline-hint.hidden {
  opacity: 0;
  pointer-events: none;
}

/* --- 14. TECH SECTION  --- */
.tech-grid {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin: 1.5rem 0;
}

.tech-category {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.tech-label {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  min-width: 90px;
  padding-top: 6px;
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tech-tag {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  padding: 6px 14px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--text-light);
  transition: all 0.2s ease;
}

.tech-tag:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.github-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 1rem;
  transition: color 0.2s;
}

.github-link:hover {
  color: var(--accent);
}

.github-link i {
  font-size: 1.1rem;
}

@media (max-width: 500px) {
  .tech-category {
    flex-direction: column;
    gap: 0.5rem;
  }

  .tech-label {
    min-width: auto;
    padding-top: 0;
  }
}
/* ================================================
   CONTACT SECTION - REDESIGNED
   ================================================ */

.contact-wrapper {
  max-width: 500px;
}

.availability-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(76, 175, 80, 0.1);
  border: 1px solid rgba(76, 175, 80, 0.3);
  border-radius: 20px;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: #4caf50;
  margin-bottom: 1.5rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  background: #4caf50;
  border-radius: 50%;
  animation: pulse 2s ease infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.6;
    transform: scale(1.2);
  }
}

.email-box {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 1rem 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 10px;
  margin: 1.5rem 0;
}

.email-box i {
  color: var(--accent);
  font-size: 1.1rem;
}

.email-text {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--text-main);
}

.copy-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 8px;
  border-radius: 6px;
  transition: all 0.2s ease;
}

.copy-btn:hover {
  background: var(--line-light);
  color: var(--accent);
}

.copy-btn.copied {
  color: #4caf50;
}

.social-links {
  display: flex;
  gap: 12px;
  margin: 1.5rem 0;
}

.social-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--text-muted);
  font-size: 1.2rem;
  transition: all 0.3s ease;
}

.social-icon:hover {
  transform: translateY(-3px);
  box-shadow: 0 5px 15px var(--shadow);
}

/* Brand colors on hover */
.social-icon:hover .fa-github {
  color: #fff;
}
.social-icon:hover:has(.fa-github) {
  background: #333;
  border-color: #333;
}

.social-icon:hover .fa-linkedin-in {
  color: #fff;
}
.social-icon:hover:has(.fa-linkedin-in) {
  background: #0077b5;
  border-color: #0077b5;
}

.social-icon:hover .fa-twitter {
  color: #fff;
}
.social-icon:hover:has(.fa-twitter) {
  background: #1da1f2;
  border-color: #1da1f2;
}

.social-icon:hover .fa-orcid {
  color: #fff;
}
.social-icon:hover:has(.fa-orcid) {
  background: #a6ce39;
  border-color: #a6ce39;
}

.contact-info {
  display: flex;
  gap: 1.5rem;
  margin: 1.5rem 0;
  flex-wrap: wrap;
}

.info-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.info-item i {
  color: var(--accent);
  width: 16px;
}

.response-note {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 1rem;
  border-top: 1px solid var(--line-light);
  margin-top: 1rem;
}

.response-note i {
  color: var(--accent);
}

/* Responsive for skill cards */
@media (max-width: 600px) {
  .skills-grid {
    grid-template-columns: 1fr;
  }

  .contact-info {
    flex-direction: column;
    gap: 0.75rem;
  }

  .email-box {
    flex-wrap: wrap;
  }

  .email-text {
    font-size: 0.85rem;
  }
}

/* ...existing code... */

/* ================================================
   NEW IMPROVEMENTS
   ================================================ */

/* --- ACTIVE NAV LINK --- */
.nav-link.active {
  color: #fff;
  font-weight: 500;
}

.nav-link.active::before {
  content: "";
  position: absolute;
  left: -20px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 20px;
  background: var(--accent);
  border-radius: 2px;
}

.panel-links li {
  position: relative;
}

/* --- SECTION REVEAL ANIMATIONS --- */
.chapter {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.chapter.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children animations */
.chapter.visible .chapter-number {
  animation: fadeInUp 0.5s ease 0.1s both;
}

.chapter.visible .chapter-title {
  animation: fadeInUp 0.5s ease 0.2s both;
}

.chapter.visible .lead-text,
.chapter.visible > p:not(.lead-text) {
  animation: fadeInUp 0.5s ease 0.3s both;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- CATEGORY FILTER --- */
.category-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 1.5rem;
}

.filter-btn {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  padding: 6px 14px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 20px;
  color: var(--text-muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.filter-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.filter-btn i {
  font-size: 0.75rem;
}

/* --- PAPER CATEGORY ICON --- */
.paper-category {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  padding: 4px 10px;
  background: var(--line-light);
  border-radius: 4px;
  color: var(--text-muted);
  margin-right: 10px;
}

.paper-category i {
  font-size: 0.7rem;
}

/* --- RECENT BADGE --- */
.recent-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  padding: 3px 8px;
  background: rgba(76, 175, 80, 0.15);
  border: 1px solid rgba(76, 175, 80, 0.3);
  border-radius: 4px;
  color: #4caf50;
  margin-left: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.recent-badge i {
  font-size: 0.6rem;
}

/* --- 404 ERROR PAGE FOR PAPERS --- */
.paper-not-found {
  text-align: center;
  padding: 4rem 2rem;
  max-width: 500px;
  margin: 0 auto;
}

.paper-not-found i {
  font-size: 4rem;
  color: var(--accent);
  margin-bottom: 1.5rem;
  display: block;
}

.paper-not-found h1 {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  color: var(--text-main);
  margin-bottom: 1rem;
}

.paper-not-found p {
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.paper-not-found .btn-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  padding: 12px 24px;
  background: var(--accent);
  color: white;
  border-radius: 6px;
  transition: all 0.2s;
}

.paper-not-found .btn-back:hover {
  background: var(--accent-hover);
  color: white;
  transform: translateY(-2px);
}

/* --- BETTER TOUCH TARGETS (Mobile) --- */
@media (max-width: 600px) {
  .filter-btn {
    padding: 10px 16px;
    font-size: 0.85rem;
  }

  .nav-link {
    padding: 12px 0;
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  .social-icon {
    width: 48px;
    height: 48px;
  }

  .action-btn {
    min-width: 44px;
    min-height: 44px;
    padding: 10px 14px;
  }

  .page-btn {
    min-width: 44px;
    min-height: 44px;
    padding: 10px 14px;
  }

  .copy-btn {
    min-width: 44px;
    min-height: 44px;
  }

  .clear-search {
    min-width: 44px;
    min-height: 44px;
  }

  .theme-btn-outlined {
    min-height: 48px;
  }

  .btn-text {
    min-height: 48px;
    padding: 12px 28px;
  }
}

/* --- SECTION DIVIDER ANIMATION --- */
.section-divider {
  opacity: 0;
  transform: scaleX(0);
  transition: opacity 0.6s ease, transform 0.8s ease;
}

.section-divider.visible {
  opacity: 1;
  transform: scaleX(1);
}

/* Add at the end of your file */

/* ================================================
   IMPROVED TYPOGRAPHY & READABILITY
   ================================================ */

/* Better paragraph spacing */
#main-content p {
  margin-bottom: 1.25rem;
  letter-spacing: 0.01em;
}

/* Softer headings */
.chapter-title {
  letter-spacing: -0.02em;
  font-weight: 500;
}

/* Paper cards with subtle depth */
.paper-entry {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 2rem;
  margin-bottom: 1.5rem;
  transition: all 0.3s ease;
  box-shadow: 0 1px 2px var(--shadow), 0 4px 12px transparent;
}

.paper-entry:hover {
  border-color: var(--accent);
  box-shadow: 0 2px 4px var(--shadow), 0 8px 24px var(--shadow);
  transform: translateY(-2px);
}

/* Warmer link colors for better contrast */
.paper-title-link {
  color: var(--text-main);
  transition: color 0.2s;
}

.paper-title-link:hover {
  color: var(--accent);
}

/* Improved category badge */
.paper-category {
  background: rgba(201, 120, 93, 0.1);
  border: 1px solid rgba(201, 120, 93, 0.2);
  color: var(--accent);
}

[data-theme="light"] .paper-category {
  background: rgba(184, 90, 60, 0.08);
  border: 1px solid rgba(184, 90, 60, 0.15);
}

/* Softer filter buttons */
.filter-btn {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--text-muted);
}

.filter-btn:hover {
  background: var(--line-light);
  border-color: var(--line);
  color: var(--text-main);
}

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

/* Warmer tech tags */
.tech-tag {
  background: var(--line-light);
  border: 1px solid var(--line);
  color: var(--text-light);
}

.tech-tag:hover {
  background: rgba(201, 120, 93, 0.1);
  border-color: var(--accent);
  color: var(--accent);
}

/* Improved search bar */
.search-container input {
  background: var(--bg-card);
  border: 1px solid var(--line);
  color: var(--text-main);
}

.search-container input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(201, 120, 93, 0.15);
}

/* Timeline refinements */
.timeline-list li::before {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--bg-body), 0 0 12px rgba(201, 120, 93, 0.2);
}

.year {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--bg-card);
}

/* Email box warmth */
.email-box {
  background: var(--bg-card);
  border: 1px solid var(--line);
}

.email-box i {
  color: var(--accent);
}

/* Social icons */
.social-icon {
  background: var(--bg-card);
  border: 1px solid var(--line);
  color: var(--text-muted);
}

.social-icon:hover {
  transform: translateY(-3px);
}

/* Back to top button */
.back-to-top {
  background: var(--accent);
  box-shadow: 0 4px 15px rgba(201, 120, 93, 0.3);
}

.back-to-top:hover {
  background: var(--accent-hover);
}

/* Section divider */
.section-divider {
  border-top: 1px solid var(--line);
  opacity: 0.6;
}

/* Side panel improvements */
.side-panel {
  background: var(--panel-bg);
}

.nav-link {
  color: #8a8580;
}

.nav-link:hover {
  color: #e8e4df;
}

.nav-link.active {
  color: #fff;
}

.nav-link.active::before {
  background: var(--accent);
}

/* Theme toggle button */
.theme-btn-outlined {
  border-color: #3a3836;
  color: #b8b2aa;
}

.theme-btn-outlined:hover {
  border-color: #5a5856;
  background: rgba(255, 255, 255, 0.03);
  color: #e8e4df;
}

/* Menu button */
.menu-btn {
  background: var(--bg-card);
  border: 1px solid var(--line);
}

.menu-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Skeleton loader warmth */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--line-light) 25%,
    var(--line) 50%,
    var(--line-light) 75%
  );
}

/* Publication button */
.publication-btn {
  background: var(--accent);
}

.publication-btn:hover {
  background: var(--accent-hover);
  box-shadow: 0 4px 15px rgba(201, 120, 93, 0.3);
}

/* Action buttons on paper page */
.action-btn {
  background: var(--bg-card);
  border: 1px solid var(--line);
}

.action-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Reading progress bar */
.reading-progress {
  background: var(--accent);
}

/* Toast notification */
.toast {
  background: var(--bg-card);
  border: 1px solid var(--line);
}

/* Availability badge - keep green but warmer */
.availability-badge {
  background: rgba(107, 142, 95, 0.12);
  border: 1px solid rgba(107, 142, 95, 0.25);
  color: #7fa86f;
}

.status-dot {
  background: #7fa86f;
}

/* Recent badge - warmer green */
.recent-badge {
  background: rgba(107, 142, 95, 0.12);
  border: 1px solid rgba(107, 142, 95, 0.25);
  color: #7fa86f;
}

/* Chapter number */
.chapter-number {
  color: var(--accent);
  letter-spacing: 2.5px;
}

/* Lead text improvement */
.lead-text {
  color: var(--text-light);
  font-size: 1.15rem;
  line-height: 1.9;
}