/* === Base / Theme === */
:root{
  --gray-900:#111827; --gray-800:#1F2937; --gray-700:#374151; --gray-600:#4B5563;
  --gray-500:#6B7280; --gray-400:#9CA3AF; --gray-300:#D1D5DB; --white:#ffffff;
  --teal-300:#5eead4; --teal-400:#2dd4bf; --teal-500:#14b8a6; --teal-600:#0d9488;
  --radius:0.75rem; --radius-lg:1rem; --shadow:0 10px 25px rgba(0,0,0,.25);
  --transition: all .25s ease;
}

html{ scroll-behavior:smooth; }
body.theme-dark{
  margin:0; color:var(--gray-300); background:var(--gray-900);
  font-family: "Lato", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  line-height:1.6;
}

/* Typography */
h1,h2,h3{ font-family:"Roboto Slab", Georgia, serif; color:var(--white); margin:0 0 .75rem; }
.section__title{ font-size:2.25rem; letter-spacing:.2px; }
.lede{ font-size:1.125rem; margin:0 0 2rem; color:var(--gray-300); }
.prose p{ margin:0 0 1rem; font-size:1.125rem; }
.accent{ color:var(--teal-400); font-weight:700; }

/* Links */
a{ color:inherit; text-decoration:none; }
a.link{ color:var(--gray-300); border-bottom:1px solid transparent; transition:var(--transition); }
a.link:hover{ color:var(--white); border-color:var(--gray-300); }

/* Layout */
.main{ padding: 0 1.5rem; }
.section{ padding: 1rem 0; }
.section__content{ max-width: 64rem; margin: 0 auto; }
.section__content--center{ text-align:center; }

/* Sidebar (desktop) */
.sidebar{
  display:none; position:fixed; inset:0 auto 0 0; width:18rem;
  background:rgba(31,41,55,.5); backdrop-filter: blur(6px);
  padding:2rem; z-index:40; border-right:1px solid rgba(55,65,81,.6);
}
.sidebar__top{ display:flex; flex-direction:column; gap:2rem; }
.profile{ text-align:center; }
.profile__avatar{
  width:8rem; height:8rem; object-fit:cover; border-radius:999px;
  box-shadow:var(--shadow); margin:0 auto 1rem; border:2px solid rgba(45,212,191,.5);
}
.profile__name{ font-size:1.5rem; }
.profile__title{ color:var(--teal-400); margin: .25rem 0 0; }
.nav__list{ list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:1rem; align-items:center; }
.nav__link{
  color:#9aa4b2; text-transform:uppercase; letter-spacing:.15em; font-weight:700; font-size:.8rem;
  transition:var(--transition);
}
.nav__link:hover{ color:var(--teal-300); }
.sidebar__bottom{ text-align:center; }
.socials{ display:flex; justify-content:center; gap:1rem; }
.socials__link{ color:#6b7280; transition:var(--transition); font-size:1.125rem; }
.socials__link:hover{ color:var(--teal-400); }
.sidebar__copy{ color:#6b7280; font-size:.75rem; margin-top:1.5rem; }

/* Mobile header (shown under md) */
.mheader{
  position:sticky; top:0; z-index:50; display:flex; align-items:center; justify-content:space-between;
  padding:1rem; background:rgba(31,41,55,.8); backdrop-filter: blur(6px);
}
.mheader__brand{ font-size:1.25rem; }
.mheader__toggle{ background:none; border:none; color:var(--gray-300); font-size:1.25rem; cursor:pointer; }

/* Mobile menu overlay */
.mmenu{
  position:fixed; inset:0; display:none; z-index:40;
  background:rgba(17,24,39,.95);
  align-items:center; justify-content:center; gap:2rem; flex-direction:column;
}
.mmenu.is-open{ display:flex; }
.mmenu__link{ color:var(--gray-300); font-size:2rem; transition:var(--transition); }
.mmenu__link:hover{ color:var(--teal-300); }

/* Cards, chips, publications */
.card{
  background:var(--gray-800); border:1px solid var(--gray-700);
  border-radius:var(--radius); padding:1.5rem;
}
.card__title{ color:var(--teal-400); font-size:1.25rem; margin-bottom:1rem; }
.chips{ display:flex; flex-wrap:wrap; gap:.5rem; }
.chip{
  background:var(--gray-700); color:var(--gray-300); font-weight:600; font-size:.9rem;
  padding:.3rem .75rem; border-radius:.5rem;
}

.pub{
  background:var(--gray-800); border:1px solid var(--gray-700);
  border-radius:var(--radius); padding:1.5rem; transition:border-color .25s ease;
}
.pub:hover{ border-color:rgba(45,212,191,.5); }
.pub__title{ font-size:1.25rem; }
.pub__authors{ color:var(--gray-400); margin:.4rem 0; font-size:.95rem; }
.pub__venue{ color:var(--teal-400); font-style:italic; font-size:.9rem; }
.pub__links{ margin-top:1rem; display:flex; gap:1rem; }

/* Buttons */
.btn{
  display:inline-block; font-weight:700; padding:.9rem 2rem; border-radius:.5rem; transition:var(--transition);
}
.btn--primary{
  background:var(--teal-500); color:var(--white);
}
.btn--primary:hover{ background:var(--teal-600); }

/* Scroll fade-in (optional animation hook) */
.scroll-fade{ opacity:1; transform:translateY(0); transition:opacity .6s ease, transform .6s ease; }

/* Responsive */
@media (min-width: 768px){ /* md */
  .sidebar{ display:flex; flex-direction:column; justify-content:space-between; }
  .mheader{ display:none; }
  .main{ margin-left:18rem; padding: 0 3rem; }
}
@media (min-width: 1024px){ /* lg */
  .sidebar{ width:20rem; }
  .main{ margin-left:20rem; padding: 0 5rem; }
  .section__title{ font-size:2.5rem; }
}

/* Active section link */
.nav__link.is-active {
  color: var(--teal-300);
  position: relative;
}
.nav__link.is-active::after {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: -6px;
  width: 24px;
  height: 2px;
  background: var(--teal-400);
  border-radius: 2px;
}


/* Work Experience / Timeline */
.timeline{
  display:flex; flex-direction:column; gap:1rem;
  border-left:2px solid var(--gray-700);
  padding-left:1.25rem;
}
.xp{
  position:relative;
  background:var(--gray-800);
  border:1px solid var(--gray-700);
  border-radius:var(--radius);
  padding:1rem 1.25rem;
}
.xp::before{
  content:"";
  position:absolute; left:-0.6rem; top:1.15rem;
  width:0.75rem; height:0.75rem; border-radius:999px;
  background:var(--teal-500);
  box-shadow:0 0 0 3px rgba(20,184,166,.25);
}
.xp__header{
  display:flex; align-items:baseline; justify-content:space-between; gap:.5rem; flex-wrap:wrap;
}
.xp__role{ font-size:1.05rem; color:var(--white); margin:0; }
.xp__meta{ color:var(--gray-400); font-size:.9rem; }
.xp__bullets{ margin:.5rem 0 0 1rem; }
.xp__bullets li{ margin:.25rem 0; }
.xp__tags{ margin-top:.6rem; display:flex; gap:.5rem; flex-wrap:wrap; }