/* ============================================
   RESET & BASE
   ============================================ */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-weight: 400;
  line-height: 1.6;
  color: #e0e0e0;
  background-color: #2a2a2a;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: #c8c8c8;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #ffffff;
}

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

/* ============================================
   LAYOUT: Two-column (fixed left + scrolling right)
   ============================================ */

.site-wrapper {
  display: flex;
  min-height: 100vh;
}

/* ============================================
   SIDEBAR (Left Panel - Fixed)
   ============================================ */

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 380px;
  background-color: #2a2a2a;
  padding: 3rem 2.5rem;
  display: flex;
  flex-direction: column;
  z-index: 100;
  border-right: 1px solid rgba(255, 255, 255, 0.06);
}

.sidebar-inner {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
}

.sidebar-top {
  flex: 1;
}

/* Site Name */
.site-name {
  font-family: 'Playfair Display', 'Georgia', serif;
  font-size: 2.2rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 1rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

/* Affiliation */
.site-affiliation {
  font-size: 0.85rem;
  font-weight: 400;
  color: #999999;
  line-height: 1.6;
  margin-bottom: 0.6rem;
}

/* Email */
.site-email {
  margin-bottom: 2.5rem;
}

.site-email a {
  font-size: 0.85rem;
  color: #999999;
  transition: color 0.2s ease;
}

.site-email a:hover {
  color: #ffffff;
}

/* Navigation */
.site-nav {
  display: flex;
  flex-direction: row;
  gap: 1.5rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: #b0b0b0;
  text-decoration: none;
  transition: color 0.2s ease;
  position: relative;
  padding-bottom: 2px;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background-color: #ffffff;
  transition: width 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
  color: #ffffff;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* Social Links */
.social-links {
  display: flex;
  gap: 1rem;
  margin-top: 0.5rem;
}

.social-links a {
  font-size: 1.1rem;
  color: #888888;
  transition: color 0.2s ease, transform 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.social-links a:hover {
  color: #ffffff;
  transform: translateY(-1px);
}

/* Sidebar Bottom */
.sidebar-bottom {
  margin-top: auto;
}

.copyright {
  font-size: 0.75rem;
  color: #666666;
}

/* ============================================
   MAIN CONTENT (Right Panel - Scrollable)
   ============================================ */

.main-content {
  margin-left: 380px;
  flex: 1;
  padding: 4rem 4rem 4rem 4rem;
  max-width: 820px;
  min-height: 100vh;
}

/* ============================================
   HERO / PROFILE SECTION
   ============================================ */

.hero-section {
  display: flex;
  align-items: flex-start;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.hero-image-wrapper {
  position: relative;
  flex-shrink: 0;
}

/* Animated blob background (like oscarpetrov.com) */
.blob-container {
  position: absolute;
  width: 200px;
  height: 200px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 0;
}

.blob {
  position: absolute;
  filter: blur(25px);
  opacity: 0.5;
}

.blob-1 {
  width: 190px;
  height: 190px;
  background: #4a6fa5;
  top: -15px;
  left: -15px;
  border-radius: 60% 40% 55% 45% / 55% 60% 40% 45%;
  animation: blob-morph-1 8s ease-in-out infinite, blob-float-1 6s ease-in-out infinite;
}

.blob-2 {
  width: 170px;
  height: 170px;
  background: #6b8cae;
  bottom: -15px;
  right: -15px;
  border-radius: 45% 55% 40% 60% / 60% 45% 55% 40%;
  animation: blob-morph-2 10s ease-in-out infinite, blob-float-2 7s ease-in-out infinite;
}

/* Morphing shape animation */
@keyframes blob-morph-1 {
  0%, 100% { border-radius: 60% 40% 55% 45% / 55% 60% 40% 45%; }
  25%      { border-radius: 45% 55% 65% 35% / 40% 50% 50% 60%; }
  50%      { border-radius: 55% 45% 40% 60% / 65% 35% 55% 45%; }
  75%      { border-radius: 40% 60% 50% 50% / 50% 45% 60% 40%; }
}

@keyframes blob-morph-2 {
  0%, 100% { border-radius: 45% 55% 40% 60% / 60% 45% 55% 40%; }
  25%      { border-radius: 55% 45% 60% 40% / 45% 55% 40% 60%; }
  50%      { border-radius: 40% 60% 45% 55% / 55% 40% 60% 45%; }
  75%      { border-radius: 60% 40% 55% 45% / 40% 60% 45% 55%; }
}

/* Floating movement */
@keyframes blob-float-1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25%      { transform: translate(18px, -12px) scale(1.08); }
  50%      { transform: translate(-8px, 15px) scale(0.95); }
  75%      { transform: translate(-15px, -8px) scale(1.04); }
}

@keyframes blob-float-2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25%      { transform: translate(-18px, 10px) scale(1.06); }
  50%      { transform: translate(12px, -18px) scale(0.96); }
  75%      { transform: translate(8px, 12px) scale(1.05); }
}

.hero-photo {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  position: relative;
  z-index: 1;
  border: 3px solid rgba(255, 255, 255, 0.1);
}

.hero-text {
  flex: 1;
  padding-top: 0.5rem;
}

.hero-text p {
  font-size: 0.95rem;
  line-height: 1.8;
  color: #cccccc;
}

.hero-text p strong,
.hero-text p u {
  color: #e8e8e8;
  font-weight: 500;
}

/* ============================================
   SECTIONS
   ============================================ */

section {
  margin-bottom: 4rem;
  scroll-margin-top: 2rem;
}

.section-title {
  font-family: 'Playfair Display', 'Georgia', serif;
  font-size: 1.6rem;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 2rem;
  padding-bottom: 0.5rem;
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 2px;
  background-color: #6b8cae;
}

/* ============================================
   ABOUT SECTION
   ============================================ */

.about-content h3 {
  font-family: 'Inter', sans-serif;
  font-size: 1.05rem;
  font-weight: 600;
  color: #e0e0e0;
  margin-top: 2rem;
  margin-bottom: 0.8rem;
}

.about-content h3:first-child {
  margin-top: 0;
}

.about-content p {
  font-size: 0.9rem;
  line-height: 1.8;
  color: #bbbbbb;
  margin-bottom: 0.8rem;
}

.about-content ul {
  list-style: none;
  padding-left: 0;
  margin-bottom: 1rem;
}

.about-content ul li {
  font-size: 0.9rem;
  line-height: 1.8;
  color: #bbbbbb;
  padding-left: 1.2rem;
  position: relative;
  margin-bottom: 0.4rem;
}

.about-content ul li::before {
  content: '\2022';
  color: #6b8cae;
  position: absolute;
  left: 0;
  font-weight: bold;
}

.about-content ul li strong {
  color: #d0d0d0;
  font-weight: 600;
}

.about-content ul ul {
  margin-top: 0.3rem;
  margin-bottom: 0.3rem;
}

/* Contact info in about */
.contact-block {
  margin-top: 1.5rem;
  padding: 1.2rem 1.5rem;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.contact-block p {
  font-size: 0.85rem;
  margin-bottom: 0.3rem;
}

.contact-block a {
  color: #8ab4d6;
}

.contact-block a:hover {
  color: #ffffff;
}

/* ============================================
   UPDATES SECTION
   ============================================ */

.update-item {
  padding: 1.5rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

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

.update-item h3 {
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  color: #e0e0e0;
  margin-bottom: 0.8rem;
}

.update-item p,
.update-item li {
  font-size: 0.9rem;
  line-height: 1.8;
  color: #bbbbbb;
  margin-bottom: 0.5rem;
}

.update-item ul {
  list-style: none;
  padding-left: 0;
  margin-top: 0.5rem;
}

.update-item ul li {
  padding-left: 1.2rem;
  position: relative;
  margin-bottom: 0.4rem;
}

.update-item ul li::before {
  content: '\2013';
  color: #6b8cae;
  position: absolute;
  left: 0;
}

.update-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #6b8cae;
  background: rgba(107, 140, 174, 0.1);
  border: 1px solid rgba(107, 140, 174, 0.2);
  padding: 0.15rem 0.6rem;
  border-radius: 3px;
  margin-bottom: 0.8rem;
}

.update-inquiry {
  margin-top: 1rem;
  padding: 1rem 1.2rem;
  background: rgba(107, 140, 174, 0.08);
  border-radius: 6px;
  border-left: 3px solid #6b8cae;
}

.update-inquiry p {
  font-size: 0.85rem;
  color: #b0b0b0;
  margin: 0;
}

/* ============================================
   RESUME SECTION
   ============================================ */

.resume-category {
  margin-bottom: 2.5rem;
}

.resume-category-title {
  font-family: 'Inter', sans-serif;
  font-size: 1.05rem;
  font-weight: 600;
  color: #e0e0e0;
  margin-bottom: 1.2rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Education Items */
.resume-item {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 1rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

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

.resume-item-main {
  flex: 1;
}

.resume-item-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: #d8d8d8;
  margin-bottom: 0.25rem;
}

.resume-item-subtitle {
  font-size: 0.85rem;
  color: #999999;
  margin-bottom: 0.15rem;
}

.resume-item-detail {
  font-size: 0.8rem;
  color: #777777;
}

.resume-item-date {
  font-size: 0.8rem;
  color: #777777;
  white-space: nowrap;
  margin-left: 1.5rem;
  flex-shrink: 0;
}

/* Research Experience Cards */
.research-list {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.research-entry {
  display: block;
  padding: 1.2rem 1.5rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 8px;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.research-entry:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.12);
}

/* Clickable research entries (links to subpages) */
a.research-entry-link {
  text-decoration: none;
  cursor: pointer;
}

a.research-entry-link:hover {
  transform: translateX(4px);
  border-color: rgba(107, 140, 174, 0.4);
  background: rgba(107, 140, 174, 0.08);
}

a.research-entry-link:hover .research-entry-title {
  color: #ffffff;
}

a.research-entry-link:hover .entry-arrow {
  opacity: 1;
  transform: translateX(3px);
}

.entry-arrow {
  opacity: 0.4;
  font-weight: 400;
  margin-left: 0.4rem;
  transition: opacity 0.2s ease, transform 0.2s ease;
  display: inline-block;
}

.research-entry-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: #d8d8d8;
  margin-bottom: 0.25rem;
  transition: color 0.2s ease;
}

.research-entry-lab {
  font-size: 0.8rem;
  color: #888888;
}

/* Awards */
.award-item {
  padding: 0.8rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

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

.award-name {
  font-size: 0.9rem;
  font-weight: 500;
  color: #cccccc;
}

.award-org {
  font-size: 0.8rem;
  color: #888888;
}

/* ============================================
   SUBPAGES (Research detail pages)
   ============================================ */

.subpage {
  padding-top: 0;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: #888888;
  text-decoration: none;
  margin-bottom: 2rem;
  transition: color 0.2s ease, transform 0.2s ease;
}

.back-link:hover {
  color: #ffffff;
  transform: translateX(-3px);
}

.back-link i {
  font-size: 0.75rem;
}

.subpage-title {
  font-family: 'Playfair Display', 'Georgia', serif;
  font-size: 1.5rem;
  font-weight: 600;
  color: #ffffff;
  line-height: 1.4;
  margin-bottom: 2rem;
}

.subpage-content p {
  font-size: 0.9rem;
  line-height: 1.9;
  color: #bbbbbb;
  margin-bottom: 1.2rem;
}

.subpage-content h2 {
  font-family: 'Inter', sans-serif;
  font-size: 1.1rem;
  font-weight: 600;
  color: #e0e0e0;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.subpage-content h3 {
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  color: #d0d0d0;
  margin-bottom: 0.8rem;
}

.subpage-content ul {
  list-style: none;
  padding-left: 0;
  margin-bottom: 1.2rem;
}

.subpage-content ul li {
  font-size: 0.9rem;
  line-height: 1.8;
  color: #bbbbbb;
  padding-left: 1.2rem;
  position: relative;
  margin-bottom: 0.5rem;
}

.subpage-content ul li::before {
  content: '\2022';
  color: #6b8cae;
  position: absolute;
  left: 0;
  font-weight: bold;
}

.subpage-content strong {
  color: #d0d0d0;
  font-weight: 600;
}

/* Key Takeaway */
.key-takeaway {
  margin: 2rem 0;
  padding: 1.2rem 1.5rem;
  background: rgba(107, 140, 174, 0.08);
  border-left: 3px solid #6b8cae;
  border-radius: 0 6px 6px 0;
}

.key-takeaway p {
  font-size: 0.88rem;
  line-height: 1.8;
  color: #b0b0b0;
  margin: 0;
}

.key-takeaway strong {
  color: #d8d8d8;
}

/* PDF Viewer */
.pdf-viewer {
  margin: 1.5rem 0;
}

.pdf-viewer iframe {
  width: 100%;
  min-height: 800px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 6px;
  background: #1e1e1e;
}

/* ============================================
   MOBILE HEADER & NAV
   ============================================ */

.mobile-header {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 60px;
  background-color: #2a2a2a;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding: 0 1.5rem;
  align-items: center;
  justify-content: space-between;
  z-index: 200;
}

.mobile-name {
  font-family: 'Playfair Display', 'Georgia', serif;
  font-size: 1.2rem;
  font-weight: 700;
  color: #ffffff;
}

.mobile-menu-btn {
  background: none;
  border: none;
  color: #cccccc;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.5rem;
  transition: color 0.2s ease;
}

.mobile-menu-btn:hover {
  color: #ffffff;
}

.mobile-nav-overlay {
  display: none;
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(42, 42, 42, 0.98);
  z-index: 199;
  padding: 2rem;
}

.mobile-nav-overlay.active {
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding-top: 2rem;
}

.mobile-nav-link {
  font-size: 1.2rem;
  font-weight: 500;
  color: #cccccc;
  text-decoration: none;
  transition: color 0.2s ease;
}

.mobile-nav-link:hover {
  color: #ffffff;
}

.mobile-social-links {
  display: flex;
  gap: 1.5rem;
  margin-top: 1rem;
}

.mobile-social-links a {
  font-size: 1.2rem;
  color: #888888;
}

.mobile-social-links a:hover {
  color: #ffffff;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

/* Tablet */
@media (max-width: 1024px) {
  .sidebar {
    width: 320px;
    padding: 2.5rem 2rem;
  }

  .main-content {
    margin-left: 320px;
    padding: 3rem 2.5rem;
  }

  .site-name {
    font-size: 1.8rem;
  }

  .hero-section {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .hero-text {
    padding-top: 0;
  }
}

/* Mobile */
@media (max-width: 768px) {
  .sidebar {
    display: none;
  }

  .mobile-header {
    display: flex;
  }

  .main-content {
    margin-left: 0;
    padding: 80px 1.5rem 3rem 1.5rem;
    max-width: 100%;
  }

  .hero-section {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1.5rem;
  }

  .hero-photo {
    width: 130px;
    height: 130px;
  }

  .blob-container {
    width: 170px;
    height: 170px;
  }

  .blob-1 {
    width: 150px;
    height: 150px;
  }

  .blob-2 {
    width: 130px;
    height: 130px;
  }

  .section-title {
    font-size: 1.4rem;
  }

  .resume-item {
    flex-direction: column;
  }

  .resume-item-date {
    margin-left: 0;
    margin-top: 0.3rem;
  }

  section {
    margin-bottom: 3rem;
  }

  .subpage-title {
    font-size: 1.2rem;
  }

  .pdf-viewer iframe {
    min-height: 500px;
  }
}

/* Small mobile */
@media (max-width: 480px) {
  .main-content {
    padding: 70px 1rem 2rem 1rem;
  }

  .site-name,
  .mobile-name {
    font-size: 1.1rem;
  }

  .hero-photo {
    width: 110px;
    height: 110px;
  }

  .section-title {
    font-size: 1.2rem;
  }

  .hero-text p {
    font-size: 0.88rem;
  }
}

/* ============================================
   SCROLLBAR (Subtle)
   ============================================ */

::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: #2a2a2a;
}

::-webkit-scrollbar-thumb {
  background: #444444;
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: #555555;
}

/* ============================================
   SELECTION
   ============================================ */

::selection {
  background: rgba(107, 140, 174, 0.3);
  color: #ffffff;
}

/* ============================================
   PRINT
   ============================================ */

@media print {
  .sidebar,
  .mobile-header,
  .mobile-nav-overlay {
    display: none;
  }

  .main-content {
    margin-left: 0;
    padding: 0;
    color: #000;
    background: #fff;
  }

  body {
    background: #fff;
    color: #000;
  }
}