html {
  scroll-behavior: smooth;
}


/* GLOBAL — LIGHT DEFAULT */
body {
  font-family: 'Inter', sans-serif;
  margin: 0;
  line-height: 1.6;
  background: #f9fafb;
  color: #111827;

  transition:
    background 0.3s ease,
    color 0.3s ease;
}



/* DARK MODE */
body.dark {
  background: radial-gradient(circle at top, #0f172a, #020617);
  color: #e5e7eb;
}


body.dark .card {
  background: rgba(17,24,39,0.7);
  color: #e5e7eb;
  border: 1px solid #1f2937;
}

/* HEADER RESET */
header {
  padding: 0;
}



/* NAV */
nav {
  display: flex;
  justify-content: center;
  gap: 25px;
  padding: 15px;

  background: rgba(255,255,255,0.96);

  border-bottom: 1px solid #e5e7eb;
  position: sticky;
  top: 0;
  z-index: 1000;
  overflow-x: auto;
  white-space: nowrap;
}


nav::-webkit-scrollbar {
  display: none;
}

nav a {
  text-decoration: none;
}

nav a:hover {
  color: #38bdf8;
}

/* DARK MODE NAV */
body.dark nav {
  background: rgba(2,6,23,0.7);
}

body.dark nav a {
  color: #e5e7eb;
}

body:not(.dark) nav a {
  color: #111827;
}

#themeToggle {
  position: absolute;
  right: 20px;
  background: none;
  border: none;
  color: #38bdf8;
  font-size: 18px;
  cursor: pointer;
}

/* SECTION */
section {
  max-width: 900px;
  margin: auto;
  padding: 80px 20px;
}

h2 {
  color: #38bdf8;
  margin-bottom: 25px;
}

/* CARD */
.card {
  background: white;
  color: #111827;
  padding: 25px;
  border-radius: 16px;
  margin-bottom: 20px;
  border: 1px solid #e5e7eb;
  transition: 0.3s;

  max-width: 900px;          /* ADD */
  margin-left: auto;         /* ADD */
  margin-right: auto;        /* ADD */
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(56,189,248,0.15);
}
.card,
.publication-item,
.teaching-item,
.hero,
nav {
  transition:
    background 0.3s ease,
    border-color 0.3s ease,
    color 0.3s ease;
}


/* RESEARCH INTEREST */
.interest-list {
  list-style: none;
  padding-left: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 30px;
}

.interest-list li {
  padding: 10px 0;
  border-bottom: 1px solid #e5e7eb;
  position: relative;
  padding-left: 20px;
}

body.dark .interest-list li {
  border-bottom: 1px solid #1f2937;
}

.interest-list li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: #38bdf8;
}

/* TIMELINE */
.timeline {
  border-left: 2px solid #38bdf8;
  padding-left: 20px;
}

.timeline div {
  margin-bottom: 20px;
}


/* SECTION SUBTITLE */
.section-subtitle {
  color: #6b7280;
  margin-bottom: 35px;
  font-size: 1rem;
}

/* TEACHING */
.teaching-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.teaching-item {
  display: flex;
  gap: 30px;
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 14px;
  padding: 24px;
  transition: 0.25s ease;
}

.teaching-item:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 25px rgba(0,0,0,0.05);
}

.teaching-date {
  min-width: 180px;
  font-weight: 600;
  color: #0f172a;
}

.teaching-content h3 {
  margin: 0 0 4px 0;
  font-size: 1.05rem;
  color: #111827;
}

.teaching-content p {
  margin: 0 0 14px 0;
  color: #6b7280;
  font-size: 0.95rem;
}

body.dark .teaching-item {
  background: rgba(17,24,39,0.7);
  border: 1px solid #1f2937;
}

body.dark .teaching-date,
body.dark .teaching-content h3 {
  color: #e5e7eb;
}

body.dark .teaching-content p,
body.dark .section-subtitle {
  color: #94a3b8;
}

@media (max-width: 768px) {

  .teaching-item {
    flex-direction: column;
    gap: 12px;
  }

  .teaching-date {
    min-width: auto;
  }

}

/* PUBLICATIONS */
.publication-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.publication-item {
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 14px;
  padding: 28px;
  transition: 0.25s ease;
}

.publication-item:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 25px rgba(0,0,0,0.05);
}

.publication-item h3 {
  margin-top: 0;
  margin-bottom: 12px;
  font-size: 1.08rem;
  line-height: 1.5;
  color: #111827;
}

.pub-authors {
  color: #374151;
  margin-bottom: 8px;
  font-size: 0.96rem;
}

.pub-venue {
  color: #6b7280;
  margin-bottom: 18px;
  font-size: 0.95rem;
}
.pub-summary {
  color: #374151;
  line-height: 1.7;
  margin-bottom: 18px;
}

body.dark .pub-summary {
  color: #cbd5e1;
}

.pub-link {
  color: #38bdf8;
  text-decoration: none;
  font-weight: 500;
}

.pub-link:hover {
  text-decoration: underline;
}

/* DARK MODE */
body.dark .publication-item {
  background: rgba(17,24,39,0.7);
  border: 1px solid #1f2937;
}

body.dark .publication-item h3 {
  color: #e5e7eb;
}

body.dark .pub-authors {
  color: #cbd5e1;
}

body.dark .pub-venue {
  color: #94a3b8;
}

body.dark .hero {
  background: rgba(17,24,39,0.75);
  border: 1px solid #1f2937;
}

body.dark .hero h1 {
  color: #f8fafc;
}

body.dark .affiliation,
body.dark .hero-tagline {
  color: #cbd5e1;
}

body.dark .hero-badges span {
  background: rgba(56,189,248,0.12);
  border: 1px solid rgba(56,189,248,0.25);
  color: #e5e7eb;
}


body.dark footer {
  color: #94a3b8;
}


/* RESEARCH DEMO */
.research-demo {
  margin-top: 60px;
  text-align: center;
}

.research-demo h3 {
  font-size: 1.35rem;
  color: #111827;
  margin-bottom: 12px;
}

.demo-subtitle {
  color: #6b7280;
  max-width: 720px;
  margin: 0 auto 24px auto;
  line-height: 1.7;
}

.demo-tags {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}

.demo-tags span {
  background: rgba(56,189,248,0.08);
  border: 1px solid rgba(56,189,248,0.18);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.82rem;
}

body.dark .research-demo h3 {
  color: #e5e7eb;
}

body.dark .demo-subtitle {
  color: #94a3b8;
}




/* CANVAS */
canvas {
  width: 100%;
  max-width: 800px;
  height: auto;
  display: block;
  margin: 20px auto;
  border-radius: 12px;
}

/* FOOTER */
footer {
  text-align: center;
  padding: 30px;
  color: #6b7280;
}



/* HERO */
.hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 60px 50px;            /* slightly tighter */
  max-width: 950px;
  margin: 40px auto;
  gap: 30px;                     /* balanced spacing */
  position: relative;   /* 🔥 required */
  overflow: hidden;
  background: white;
  border-radius: 18px;
  border: 1px solid #e5e7eb;
}

/* LEFT */
.hero-left {
  flex: 1;
  max-width: 800px;
}

/* TEXT */
.hero h1 {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -1px;
  color: #0f172a;
  line-height: 1.05;
}

.subtitle {
  color: #38bdf8;
  font-weight: 500;
}

.affiliation {
  color: #6b7280;
  margin-top: 6px;
}

/* TAGLINE (NEW) */
.hero-tagline {
  margin-top: 15px;
  color: #374151;
  line-height: 1.7;
  font-size: 1.02rem;
}

/* BADGES (NEW) */
.hero-badges {
  margin-top: 15px;
}

.hero-badges span {
  display: inline-block;
  margin: 6px 8px 0 0;
  padding: 6px 12px;
  background: rgba(56,189,248,0.12);
  border: 1px solid rgba(56,189,248,0.3);
  border-radius: 6px;
  font-size: 0.8rem;
  transition: all 0.25s ease;
}


.hero-badges span:hover {
  background: rgba(56,189,248,0.25);
  transform: translateY(-2px);
}


/* LINKS */
.hero-links {
  margin-top: 18px;
}

.hero-links a {
  margin-right: 18px;
  text-decoration: none;
  color: #38bdf8;
}

.hero-links a:hover {
  text-decoration: underline;
}

/* HERO BUTTONS */

.hero-buttons{
  margin-top:20px;
  display:flex;
  gap:14px;
  flex-wrap:wrap;
}

.hero-btn{
  display:inline-block;
  padding:10px 18px;
  border-radius:10px;
  background:#38bdf8;
  color:white;
  text-decoration:none;
  font-weight:600;
  transition:0.25s ease;
}

.hero-btn:hover{
  transform:translateY(-2px);
  background:#0ea5e9;
}


/* RIGHT */
.hero-right {
  flex: 0 0 auto;
}

/* PROFILE WRAPPER */
.profile-wrapper {
  padding: 4px;
  border-radius: 50%;
  background: white;
}


/* IMAGE */
.profile-wrapper img {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  border: 3px solid #38bdf8;
  object-fit: cover;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    circle at 20% 30%,
    rgba(56,189,248,0.08),
    transparent 60%
  );
  pointer-events: none;
  border-radius: 18px;
}


/* MOBILE */
@media (max-width: 768px) {
  .hero {
    flex-direction: column;
    text-align: center;
  }

  .hero-left,
  .hero-right {
    flex: 100%;
    max-width: 100%;
  }

  .hero-right {
    margin-top: 20px;
  }

  .hero-left p {
    max-width: 100%;   /* ✅ THIS FIX */
  }

  .interest-list {
    grid-template-columns: 1fr;
  }
}



/* ===== ADD THIS BELOW YOUR EXISTING MOBILE BLOCK ===== */
@media (max-width: 768px) {

  /* TEXT SCALING */
  .hero h1 {
    font-size: 2rem;
  }

  .subtitle {
    font-size: 0.95rem;
  }

  .hero-tagline {
    font-size: 0.9rem;
  }

  /* HERO SPACING */
  .hero {
    padding: 40px 20px;
    margin: 20px 10px;
  }

  /* PROFILE IMAGE */
  .profile-wrapper img {
    width: 110px;
    height: 110px;
  }

  /* NAVBAR FIX (THIS IS A BIG ONE) */
  nav {
    flex-wrap: wrap;
    gap: 10px;
    padding: 10px;
  }

  nav a {
    font-size: 0.85rem;
  }

  #themeToggle {
    position: static;
  }

  /* SECTION PADDING */
  section {
    padding: 50px 15px;
  }

  /* CARDS */
  .card {
    padding: 18px;
  }

  /* GRID STACK */
  .grid {
    grid-template-columns: 1fr;
  }

  /* CANVAS (CRITICAL FIX) */
  canvas {
    width: 100%;
    height: auto;
  }

  /* BADGES */
  .hero-badges span {
    font-size: 0.7rem;
    padding: 5px 10px;
  }
}





.card a {
  color: #38bdf8;
  text-decoration: none;
}

.card a:hover {
  text-decoration: underline;
}

/* =========================
   PROJECT PAGES
========================= */

.project-hero{
  max-width: 1000px;
  margin: 60px auto 30px auto;
  padding: 60px;
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 24px;
}

.project-subtitle{
  color:#38bdf8;
  font-weight:600;
  margin-bottom:18px;
  font-size:0.95rem;
}

.project-hero h1{
  font-size:4rem;
  line-height:1.05;
  letter-spacing:-2px;
  margin-bottom:25px;
  color:#0f172a;
}

.project-authors{
  color:#6b7280;
  margin-bottom:25px;
  line-height:1.8;
}

.project-tags{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
}

.project-tags span{
  background:rgba(56,189,248,0.08);
  border:1px solid rgba(56,189,248,0.2);
  padding:7px 14px;
  border-radius:999px;
  font-size:0.82rem;
}

body.dark .project-hero{
  background:rgba(17,24,39,0.75);
  border:1px solid #1f2937;
}

body.dark .project-hero h1{
  color:#f8fafc;
}

body.dark .project-authors{
  color:#cbd5e1;
}

/* MOBILE */
@media(max-width:768px){

  .project-hero{
    margin:20px 12px;
    padding:30px 22px;
  }

  .project-hero h1{
    font-size:2.3rem;
    letter-spacing:-1px;
  }

}