/* ── Dracula Palette ─────────────────────────────────────── */
:root {
  --bg:        #282a36;
  --surface:   #21222c;
  --card:      #2d2f3f;
  --line:      #44475a;
  --fg:        #f8f8f2;
  --comment:   #6272a4;
  --cyan:      #8be9fd;
  --green:     #50fa7b;
  --orange:    #ffb86c;
  --pink:      #ff79c6;
  --purple:    #bd93f9;
  --red:       #ff5555;
  --yellow:    #f1fa8c;
}

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

html { scroll-behavior: smooth; }

body {
  background-color: var(--bg);
  color: var(--fg);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.7;
}

a { color: var(--cyan); text-decoration: none; transition: color .2s; }
a:hover { color: var(--purple); }

h1, h2, h3, h4 { font-weight: 700; line-height: 1.3; }

/* ── Nav ─────────────────────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--surface);
  border-bottom: 2px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: 56px;
}

.nav-brand {
  color: var(--purple);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .5px;
}

.nav-links {
  display: flex;
  gap: 1.6rem;
  list-style: none;
}

.nav-links a {
  color: var(--fg);
  font-size: .875rem;
  font-weight: 500;
  letter-spacing: .3px;
}

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

/* ── Layout ──────────────────────────────────────────────── */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

section { padding: 72px 0; }

section + section { border-top: 1px solid var(--line); }

/* ── Section Headings ────────────────────────────────────── */
.section-title {
  font-size: 1.6rem;
  color: var(--purple);
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: .6rem;
}

.section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--line);
}

/* ── Hero ────────────────────────────────────────────────── */
#about {
  padding-top: 80px;
  padding-bottom: 80px;
}

.hero {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2.5rem;
  align-items: start;
}

.avatar {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  border: 3px solid var(--purple);
  background: var(--card);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--comment);
  overflow: hidden;
  flex-shrink: 0;
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-info h1 {
  font-size: 2rem;
  color: var(--fg);
}

.hero-info h1 span { color: var(--cyan); }

.hero-role {
  color: var(--orange);
  font-size: 1rem;
  font-weight: 600;
  margin: .3rem 0 .8rem;
  letter-spacing: .4px;
}

.hero-institution {
  color: var(--comment);
  font-size: .95rem;
  margin-bottom: 1rem;
}

.hero-bio {
  color: var(--fg);
  font-size: .95rem;
  max-width: 680px;
  margin-bottom: 1.4rem;
}

/* Profile Links */
.profile-links {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .4rem .9rem;
  border-radius: 6px;
  font-size: .82rem;
  font-weight: 600;
  border: 1.5px solid transparent;
  transition: all .2s;
}

.btn-scholar  { border-color: var(--cyan);   color: var(--cyan); }
.btn-pucrs    { border-color: var(--green);  color: var(--green); }
.btn-lattes   { border-color: var(--yellow); color: var(--yellow); }
.btn-email    { border-color: var(--orange); color: var(--orange); }

.btn:hover {
  background: var(--line);
  color: var(--fg);
  border-color: var(--fg);
}

/* ── Research Interests ──────────────────────────────────── */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
}

.tag {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: .3rem .85rem;
  font-size: .83rem;
  color: var(--fg);
  transition: border-color .2s;
}

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

/* ── Publications ────────────────────────────────────────── */
.pub-list { display: flex; flex-direction: column; gap: 1.2rem; }

.pub-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--purple);
  border-radius: 8px;
  padding: 1.1rem 1.3rem;
  transition: border-color .2s, transform .2s;
}

.pub-card:hover {
  border-left-color: var(--cyan);
  transform: translateX(3px);
}

.pub-title {
  font-size: .97rem;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: .25rem;
}

.pub-title a { color: var(--fg); }
.pub-title a:hover { color: var(--cyan); }

.pub-authors {
  font-size: .82rem;
  color: var(--comment);
  margin-bottom: .25rem;
}

.pub-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  font-size: .8rem;
}

.pub-venue { color: var(--orange); font-style: italic; }
.pub-year  { color: var(--green);  font-weight: 700; }

.badge {
  padding: .15rem .55rem;
  border-radius: 4px;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .3px;
}

.badge-conference { background: rgba(255,184,108,.15); color: var(--orange); }
.badge-journal    { background: rgba(189,147,249,.15); color: var(--purple); }
.badge-workshop   { background: rgba(139,233,253,.15); color: var(--cyan); }

/* ── People (Advisees / Alumni) ──────────────────────────── */
.people-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}

.person-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1.1rem;
  transition: border-color .2s;
}

.person-card:hover { border-color: var(--purple); }

.person-name {
  font-size: .95rem;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: .2rem;
}

.person-degree {
  font-size: .8rem;
  color: var(--cyan);
  font-weight: 600;
  margin-bottom: .25rem;
}

.person-topic {
  font-size: .8rem;
  color: var(--comment);
}

.person-year {
  font-size: .75rem;
  color: var(--green);
  margin-top: .4rem;
}

/* ── Tabs (Advisees / Alumni) ────────────────────────────── */
.tabs { display: flex; gap: .5rem; margin-bottom: 1.2rem; flex-wrap: wrap; }

.tab-btn {
  padding: .35rem .9rem;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--comment);
  cursor: pointer;
  font-size: .82rem;
  transition: border-color .2s, color .2s;
}

.tab-btn:hover { border-color: var(--cyan); color: var(--cyan); }
.tab-btn.active { border-color: var(--cyan); color: var(--cyan); }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ── Lectures ────────────────────────────────────────────── */
.lecture-list { display: flex; flex-direction: column; gap: 1rem; }

.lecture-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1.1rem 1.3rem;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: .5rem;
  align-items: start;
  transition: border-color .2s;
}

.lecture-card:hover { border-color: var(--green); }

.lecture-name {
  font-size: .97rem;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: .2rem;
}

.lecture-desc {
  font-size: .83rem;
  color: var(--comment);
}

.lecture-level {
  font-size: .75rem;
  font-weight: 700;
  padding: .2rem .6rem;
  border-radius: 4px;
  white-space: nowrap;
  align-self: start;
}

.level-grad  { background: rgba(189,147,249,.18); color: var(--purple); }
.level-under { background: rgba(80,250,123,.18);  color: var(--green); }

/* ── Footer ──────────────────────────────────────────────── */
footer {
  background: var(--surface);
  border-top: 2px solid var(--line);
  text-align: center;
  padding: 2rem 1rem;
  font-size: .83rem;
  color: var(--comment);
}

footer span { color: var(--purple); }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 620px) {
  .hero { grid-template-columns: 1fr; }
  .avatar { width: 100px; height: 100px; }
  .nav-links { gap: 1rem; }
  .nav-brand { display: none; }
}