/* =========================================================
   YUSUF KESMEN — Academic Personal Website
   Aesthetic: Academic Chic · Editorial · Refined
   ========================================================= */

/* --- Custom Properties --- */
:root {
  --bg: #FAF9F6;
  --bg-alt: #F0EDE6;
  --bg-card: #FFFFFF;
  --text: #1A1A2E;
  --text-muted: #6E6E7A;
  --text-light: #9B9BA8;
  --accent: #3D405B;
  --accent-warm: #C4764E;
  --accent-warm-light: rgba(196, 118, 78, 0.12);
  --border: #DDD9D0;
  --border-light: #ECEAE4;
  --shadow: 0 2px 20px rgba(26, 26, 46, 0.06);
  --shadow-hover: 0 8px 32px rgba(26, 26, 46, 0.1);

  --serif: 'Instrument Serif', Georgia, 'Times New Roman', serif;
  --sans: 'Plus Jakarta Sans', -apple-system, system-ui, sans-serif;
  --mono: 'IBM Plex Mono', 'Menlo', monospace;

  --container: 1100px;
  --gutter: clamp(1.5rem, 5vw, 4rem);
  --section-spacing: clamp(5rem, 10vh, 8rem);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--sans);
  font-weight: 400;
  color: var(--text);
  background-color: var(--bg);
  line-height: 1.7;
  overflow-x: hidden;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

ul, ol {
  list-style: none;
}

/* --- Grain Texture Overlay --- */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 200px;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10000;
  padding: 0 var(--gutter);
  background: rgba(250, 249, 246, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: all 0.4s ease;
  transform: translateY(-100%);
  opacity: 0;
}

.nav.visible {
  transform: translateY(0);
  opacity: 1;
  border-bottom-color: var(--border-light);
}

.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-logo {
  font-family: var(--serif);
  font-size: 1.25rem;
  color: var(--text);
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  position: relative;
  padding-bottom: 2px;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--accent-warm);
  transition: width 0.3s ease;
}

.nav-links a:hover {
  color: var(--text);
}

.nav-links a:hover::after {
  width: 100%;
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  transition: all 0.3s ease;
  border-radius: 1px;
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(4px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(4px, -5px);
}

/* Mobile nav */
.mobile-nav {
  display: none;
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  background: rgba(250, 249, 246, 0.97);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  padding: 1.5rem var(--gutter);
  z-index: 9999;
  flex-direction: column;
  gap: 1rem;
}

.mobile-nav.open {
  display: flex;
}

.mobile-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border-light);
}

.mobile-nav a:last-child {
  border-bottom: none;
}

/* --- Utility --- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* --- Section Common --- */
.section {
  padding: var(--section-spacing) 0;
}

.section-header {
  margin-bottom: 3.5rem;
  position: relative;
}

.section-number {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--accent-warm);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 0.75rem;
}

.section-title {
  font-family: var(--serif);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 400;
  color: var(--text);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.section-rule {
  width: 48px;
  height: 2px;
  background: var(--accent-warm);
  margin-top: 1.25rem;
  border: none;
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem var(--gutter);
  position: relative;
}

.hero-content {
  max-width: 750px;
  position: relative;
  z-index: 1;
}

.hero-label {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent-warm);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease 0.2s forwards;
}

.hero-name {
  font-family: var(--serif);
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 1.25rem;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeUp 0.8s ease 0.4s forwards;
}

.hero-title {
  font-size: clamp(1rem, 2vw, 1.2rem);
  font-weight: 400;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 2rem;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease 0.6s forwards;
}

.hero-title strong {
  color: var(--text);
  font-weight: 600;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease 0.8s forwards;
}

.hero-tag {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--accent);
  background: rgba(61, 64, 91, 0.06);
  padding: 0.4rem 0.85rem;
  border-radius: 100px;
  border: 1px solid rgba(61, 64, 91, 0.1);
}

.hero-social {
  display: flex;
  justify-content: center;
  gap: 1.25rem;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease 1s forwards;
}

.hero-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: all 0.3s ease;
}

.hero-social a:hover {
  border-color: var(--accent-warm);
  color: var(--accent-warm);
}

.hero-social svg {
  width: 18px;
  height: 18px;
}

.hero-scroll {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-light);
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0;
  animation: fadeUp 0.8s ease 1.2s forwards;
}

.hero-scroll-line {
  width: 1px;
  height: 40px;
  background: var(--border);
  position: relative;
  overflow: hidden;
}

.hero-scroll-line::after {
  content: '';
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--accent-warm);
  animation: scrollLine 2s ease infinite;
}

/* --- About --- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 4rem;
  align-items: start;
}

.about-portrait {
  position: relative;
}

.about-avatar {
  width: 100%;
  aspect-ratio: 3 / 4;
  background: linear-gradient(135deg, var(--accent) 0%, #2a2d4a 100%);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.about-avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
}

.about-details {
  margin-top: 1.5rem;
}

.about-detail {
  display: flex;
  justify-content: space-between;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.85rem;
}

.about-detail-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-light);
}

.about-detail-value {
  font-weight: 500;
  color: var(--text);
  text-align: right;
}

.about-bio p {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text);
  margin-bottom: 1.25rem;
}

.about-bio p:last-child {
  margin-bottom: 0;
}

.about-highlight {
  color: var(--accent-warm);
  font-weight: 600;
}

.about-education {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.about-education-title {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-warm);
  margin-bottom: 1.25rem;
}

.edu-item {
  display: flex;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
  align-items: flex-start;
}

.edu-item:last-child {
  margin-bottom: 0;
}

.edu-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  flex-shrink: 0;
  margin-top: 0.5rem;
}

.edu-content h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}

.edu-content p {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.edu-content .edu-distinction {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--accent-warm);
  margin-top: 0.25rem;
  letter-spacing: 0.02em;
}

/* --- Download CV Button --- */
.cv-download-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 2rem;
  padding: 0.75rem 1.5rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--bg);
  background: var(--accent);
  border: 1.5px solid var(--accent);
  border-radius: 4px;
  text-decoration: none;
  transition: all 0.3s ease;
}

.cv-download-btn svg {
  transition: transform 0.3s ease;
}

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

.cv-download-btn:hover svg {
  transform: translateY(2px);
}

/* --- Research --- */
.research-intro {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-muted);
  max-width: 680px;
  margin-bottom: 3rem;
}

.research-labs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 3.5rem;
}

.lab-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  padding: 2rem;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.lab-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-warm);
  transform: scaleX(0);
  transition: transform 0.4s ease;
  transform-origin: left;
}

.lab-card:hover {
  box-shadow: var(--shadow-hover);
}

.lab-card:hover::before {
  transform: scaleX(1);
}

.lab-card-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-warm);
  margin-bottom: 0.75rem;
}

.lab-card h3 {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 400;
  color: var(--text);
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.lab-card-advisor {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.lab-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.lab-card-link {
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}

.lab-card-link:hover {
  color: inherit;
}

.lab-link-icon {
  display: inline;
  vertical-align: middle;
  margin-left: 0.3rem;
  opacity: 0.3;
  transition: opacity 0.3s ease;
}

.lab-card-link:hover .lab-link-icon {
  opacity: 1;
  color: var(--accent-warm);
}

.research-areas-title {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-warm);
  margin-bottom: 1.5rem;
}

.research-areas {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.25rem;
}

.research-area {
  padding: 1.5rem;
  border: 1px solid var(--border-light);
  border-radius: 4px;
  transition: all 0.3s ease;
  background: var(--bg-card);
}

.research-area:hover {
  border-color: var(--accent-warm);
  background: var(--accent-warm-light);
}

.research-area h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.4rem;
}

.research-area p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* --- Experience --- */
.timeline {
  position: relative;
  padding-left: 2.5rem;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 7px;
  bottom: 0;
  width: 1px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding-bottom: 2.5rem;
}

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

.timeline-dot {
  position: absolute;
  left: -2.5rem;
  top: 0.35rem;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  background: var(--bg);
  z-index: 1;
  transition: all 0.3s ease;
}

.timeline-item:hover .timeline-dot {
  background: var(--accent-warm);
  border-color: var(--accent-warm);
}

.timeline-date {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-light);
  letter-spacing: 0.04em;
  margin-bottom: 0.25rem;
}

.timeline-role {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}

.timeline-company {
  font-size: 0.9rem;
  color: var(--accent-warm);
  margin-bottom: 0.5rem;
}

.timeline-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 600px;
}

/* --- Projects --- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  transition: all 0.3s ease;
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

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

.project-card-img {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--bg-alt);
}

.project-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.project-card:hover .project-card-img img {
  transform: scale(1.03);
}

.project-card-body {
  padding: 1.75rem 2rem;
  display: flex;
  flex-direction: column;
  flex: 1;
  position: relative;
}

.project-card:not(.project-card-has-img) .project-card-body {
  padding: 2rem;
}

.project-card-award {
  font-family: var(--mono);
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-warm);
  background: var(--accent-warm-light);
  padding: 0.3rem 0.65rem;
  border-radius: 100px;
  border: 1px solid rgba(196, 118, 78, 0.2);
  display: inline-block;
  width: fit-content;
  margin-bottom: 0.6rem;
}

.project-card h3 {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--text);
  margin-bottom: 0.6rem;
  line-height: 1.3;
}

.project-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 1.25rem;
  flex: 1;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.project-tech span {
  font-family: var(--mono);
  font-size: 0.66rem;
  color: var(--accent);
  background: rgba(61, 64, 91, 0.06);
  padding: 0.25rem 0.6rem;
  border-radius: 3px;
  letter-spacing: 0.02em;
}

/* --- Publications --- */
.publications-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.pub-item {
  padding: 1.75rem 2rem;
  border: 1px solid var(--border-light);
  border-radius: 4px;
  background: var(--bg-card);
  transition: all 0.3s ease;
  position: relative;
  padding-left: 2.5rem;
}

.pub-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--border);
  border-radius: 3px 0 0 3px;
  transition: background 0.3s ease;
}

.pub-item:hover {
  box-shadow: var(--shadow);
}

.pub-item:hover::before {
  background: var(--accent-warm);
}

.pub-item h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.5;
  margin-bottom: 0.4rem;
}

.pub-authors {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.pub-authors .pub-self {
  font-weight: 600;
  color: var(--accent-warm);
}

.pub-meta {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-light);
  letter-spacing: 0.04em;
}

/* --- Awards --- */
.awards-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.award-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--border-light);
  border-radius: 4px;
  background: var(--bg-card);
  transition: all 0.3s ease;
}

.award-item:hover {
  border-color: var(--accent-warm);
  box-shadow: var(--shadow);
}

.award-year {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--accent-warm);
  white-space: nowrap;
  flex-shrink: 0;
  padding-top: 0.15rem;
}

.award-content h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}

.award-content p {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

/* --- Contact --- */
.contact-section {
  background: var(--bg-alt);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.contact-text h3 {
  font-family: var(--serif);
  font-size: 1.75rem;
  font-weight: 400;
  color: var(--text);
  line-height: 1.3;
  margin-bottom: 1rem;
}

.contact-text p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
}

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

.contact-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.5rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-card);
  transition: all 0.3s ease;
}

.contact-link:hover {
  border-color: var(--accent-warm);
  transform: translateX(4px);
  box-shadow: var(--shadow);
}

.contact-link svg {
  width: 20px;
  height: 20px;
  color: var(--accent);
  flex-shrink: 0;
  transition: color 0.3s ease;
}

.contact-link:hover svg {
  color: var(--accent-warm);
}

.contact-link-info {
  flex: 1;
}

.contact-link-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-light);
}

.contact-link-value {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
}

.contact-link-arrow {
  font-size: 1.1rem;
  color: var(--text-light);
  transition: all 0.3s ease;
}

.contact-link:hover .contact-link-arrow {
  color: var(--accent-warm);
  transform: translateX(4px);
}

/* --- Footer --- */
.footer {
  padding: 2.5rem var(--gutter);
  border-top: 1px solid var(--border);
  background: var(--bg);
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-text {
  font-size: 0.78rem;
  color: var(--text-light);
}

.footer-back-top {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: color 0.3s ease;
}

.footer-back-top:hover {
  color: var(--accent-warm);
}

/* --- Animations --- */
@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scrollLine {
  0% { top: -100%; }
  50% { top: 100%; }
  100% { top: 100%; }
}

/* Scroll-triggered fade-in */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }
.reveal-delay-6 { transition-delay: 0.6s; }
.reveal-delay-7 { transition-delay: 0.7s; }
.reveal-delay-8 { transition-delay: 0.8s; }

/* --- Experience Blocks --- */
.experience-block-title {
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

/* --- Subsection Title --- */
.subsection-title {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-warm);
  margin-bottom: 1.5rem;
}

/* --- Ongoing Projects --- */
.ongoing-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.ongoing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  padding: 2rem;
  transition: all 0.3s ease;
  position: relative;
}

.ongoing-card:hover {
  box-shadow: var(--shadow-hover);
}

.ongoing-status {
  font-family: var(--mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #4a9e6e;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.ongoing-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #4a9e6e;
  animation: pulse 2s ease infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.ongoing-card h3 {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--text);
  margin-bottom: 0.6rem;
  line-height: 1.3;
}

.ongoing-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 1.25rem;
}

/* --- Project Card as Link --- */
.project-card-link {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
}

.project-card-link:hover {
  color: inherit;
}

.project-link-icon {
  display: inline;
  vertical-align: middle;
  margin-left: 0.35rem;
  opacity: 0.4;
  transition: opacity 0.3s ease;
}

.project-card-link:hover .project-link-icon {
  opacity: 1;
  color: var(--accent-warm);
}

/* --- Optinoe Card --- */
.optinoe-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  padding: 2rem;
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
}

.optinoe-card:hover {
  box-shadow: var(--shadow-hover);
  border-color: var(--accent-warm);
  color: inherit;
}

.optinoe-content h3 {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--text);
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.optinoe-content p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 700px;
}

.optinoe-tag {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--accent-warm);
  background: var(--accent-warm-light);
  padding: 0.35rem 0.75rem;
  border-radius: 100px;
  border: 1px solid rgba(196, 118, 78, 0.2);
  white-space: nowrap;
  flex-shrink: 0;
}

/* --- Publication Items as Links --- */
.pub-item-link {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  padding-left: 1.75rem;
}

.pub-item-link:hover {
  color: inherit;
}

.pub-pdf-icon {
  flex-shrink: 0;
  color: var(--text-muted);
  opacity: 0.5;
  transition: all 0.3s ease;
  margin-top: 0.15rem;
}

.pub-item-link:hover .pub-pdf-icon {
  opacity: 1;
  color: var(--accent-warm);
}

.pub-content {
  flex: 1;
}

/* --- Leadership & Community --- */
.leadership-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  max-width: 750px;
}

.tl-item {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--border-light);
  border-radius: 4px;
  background: var(--bg-card);
  transition: all 0.3s ease;
}

.tl-item:hover {
  border-color: var(--accent-warm);
  box-shadow: var(--shadow);
}

.tl-date {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--accent-warm);
  white-space: nowrap;
  flex-shrink: 0;
  padding-top: 0.15rem;
}

.tl-content h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}

.tl-content p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
  line-height: 1.6;
}

/* --- Video Grid --- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.video-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.video-card:hover {
  box-shadow: var(--shadow-hover);
}

.video-card {
  text-decoration: none;
  color: inherit;
}

.video-card:hover {
  color: inherit;
}

.video-embed {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%;
  background: #000;
  overflow: hidden;
}

.video-embed img {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease, filter 0.4s ease;
}

.video-card:hover .video-embed img {
  transform: translate(-50%, -50%) scale(1.05);
  filter: brightness(0.8);
}

.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 2;
  opacity: 0.85;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.video-card:hover .video-play-btn {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1.1);
}

.video-info {
  padding: 1rem 1.25rem;
}

.video-info h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.2rem;
}

.video-info p {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* --- Responsive --- */
@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .about-portrait {
    max-width: 280px;
  }

  .about-avatar {
    aspect-ratio: 1;
  }

  .research-labs {
    grid-template-columns: 1fr;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .awards-grid {
    grid-template-columns: 1fr;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .ongoing-grid {
    grid-template-columns: 1fr;
  }

  .video-grid {
    grid-template-columns: 1fr;
  }

  .optinoe-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-name {
    font-size: clamp(2.5rem, 10vw, 3.5rem);
  }

  .section-title {
    font-size: clamp(1.75rem, 5vw, 2.25rem);
  }

  .timeline {
    padding-left: 2rem;
  }

  .pub-item {
    padding: 1.25rem 1.5rem 1.25rem 2rem;
  }

  .project-card-body {
    padding: 1.25rem 1.5rem;
  }

  .footer-inner {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .video-grid {
    grid-template-columns: 1fr;
  }

  .pub-item-link {
    padding-left: 1.25rem;
  }
}

@media (max-width: 480px) {
  :root {
    --gutter: 1.25rem;
    --section-spacing: 4rem;
  }

  .hero-tags {
    gap: 0.35rem;
  }

  .hero-tag {
    font-size: 0.64rem;
    padding: 0.3rem 0.65rem;
  }

  .lab-card {
    padding: 1.5rem;
  }

  .project-card-body {
    padding: 1.25rem;
  }

  .award-item {
    flex-direction: column;
    gap: 0.35rem;
  }

  .tl-item {
    flex-direction: column;
    gap: 0.35rem;
  }

}