:root {
  --bg: #0b0f14;
  --bg-elevated: #11161d;
  --card: #151b23;
  --border: #232b35;
  --text: #f3f6f9;
  --text-dim: #9aa7b5;
  --accent: #2dd4bf;
  --accent-dim: #1a8f81;
  --radius: 14px;
  --max-width: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }

ul { padding-left: 1.1rem; margin: 0.75rem 0; }
li { margin-bottom: 0.5rem; }

h1, h2, h3 { line-height: 1.2; margin: 0; }

.section-inner, .nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section-inner.narrow { max-width: 760px; }

/* NAV */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 15, 20, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.5rem;
}

.nav-brand {
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--text);
  border: 1px solid var(--accent);
  border-radius: 8px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 1.75rem;
}

.nav-links a {
  color: var(--text-dim);
  font-size: 0.95rem;
  transition: color 0.15s ease;
}

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

.nav-resume { display: inline-flex; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
}

/* BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.15s ease, opacity 0.15s ease;
  border: 1px solid transparent;
}

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

.btn-primary {
  background: var(--accent);
  color: #04201c;
}

.btn-ghost {
  border-color: var(--border);
  color: var(--text);
}

.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* HERO */
.hero {
  padding: 6rem 1.5rem 5rem;
  text-align: center;
  background: radial-gradient(ellipse at top, rgba(45, 212, 191, 0.12), transparent 60%);
}

.hero-inner { max-width: 720px; margin: 0 auto; }

.avatar {
  width: 112px;
  height: 112px;
  margin: 0 auto 1.5rem;
  border-radius: 50%;
  object-fit: cover;
  object-position: center;
  border: 3px solid var(--accent);
  box-shadow: 0 0 0 6px rgba(45, 212, 191, 0.1);
}

.eyebrow {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 800;
  margin-bottom: 1rem;
}

.hero-lede {
  color: var(--text-dim);
  font-size: 1.1rem;
  max-width: 580px;
  margin: 0 auto 1.75rem;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: center;
  margin-bottom: 2rem;
}

.badge {
  font-size: 0.82rem;
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.35rem 0.85rem;
}

.badge-accent {
  color: var(--accent);
  border-color: var(--accent-dim);
  font-weight: 600;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* STATS */
.stats {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
  padding: 3rem 1.5rem;
}

.stats-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}

.stat-number {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 0.4rem;
}

.stat-label {
  color: var(--text-dim);
  font-size: 0.88rem;
}

/* SECTIONS */
.section { padding: 5rem 1.5rem; }

.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  margin-bottom: 2rem;
}

.languages-title { margin-top: 3rem; }

.about-text {
  color: var(--text-dim);
  font-size: 1.05rem;
}

/* CARDS */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  margin-bottom: 1.5rem;
}

.card h3 { font-size: 1.15rem; font-weight: 700; }

.card-sub { color: var(--accent); font-size: 0.92rem; margin: 0.2rem 0 0; }

.card-date {
  color: var(--text-dim);
  font-size: 0.88rem;
  white-space: nowrap;
}

.section-subtitle {
  color: var(--text-dim);
  margin: -1.25rem 0 2rem;
  font-size: 0.98rem;
  max-width: 620px;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.project-grid .card { margin-bottom: 0; }

.ai-badge {
  background: rgba(45, 212, 191, 0.08);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  padding: 0.9rem 1rem;
  margin: 1.1rem 0;
}

.ai-badge-tag {
  display: inline-block;
  background: var(--accent);
  color: #04201c;
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-radius: 999px;
  padding: 0.2rem 0.6rem;
  margin-bottom: 0.5rem;
}

.ai-badge p { margin: 0; color: var(--text-dim); font-size: 0.92rem; }

/* CASE STUDIES */
.case-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
  gap: 1.5rem;
}

.case-study { margin-bottom: 0; }

.case-grid .case-study:last-child {
  grid-column: 1 / -1;
}

.cs-top {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.cs-number {
  font-weight: 800;
  color: var(--text-dim);
  font-size: 0.85rem;
}

.cs-category {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 700;
  color: var(--accent);
  background: rgba(45, 212, 191, 0.1);
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
}

.case-study h3 { font-size: 1.1rem; margin-bottom: 1.1rem; }

.cs-block { margin-bottom: 0.9rem; }
.cs-block:last-child { margin-bottom: 0; }

.cs-label {
  display: block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-dim);
  margin-bottom: 0.25rem;
  font-weight: 700;
}

.cs-block p { margin: 0; color: var(--text-dim); font-size: 0.93rem; }

.cs-impact .cs-label { color: var(--accent); }
.cs-impact p { color: var(--text); font-weight: 700; }

/* SKILLS */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
}

.skill-group h3 {
  font-size: 1rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 1rem;
}

.skill-group-ai h3 { color: var(--accent); }
.skill-group-ai .tag {
  border-color: var(--accent-dim);
  background: rgba(45, 212, 191, 0.08);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  font-size: 0.85rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.4rem 0.9rem;
  color: var(--text);
}

/* EDUCATION */
.edu-list { display: flex; flex-direction: column; gap: 1.25rem; }

.edu-item {
  border-left: 2px solid var(--accent);
  padding-left: 1.25rem;
}

.edu-item h3 { font-size: 1.05rem; }

/* CONTACT */
.contact { text-align: center; }
.contact-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

/* FOOTER */
.footer {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  padding: 2.5rem 1.5rem;
  border-top: 1px solid var(--border);
}

/* SCROLL ANIMATION */
.section, .stat {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.section.visible, .stat.visible {
  opacity: 1;
  transform: translateY(0);
}

/* RESPONSIVE */
@media (max-width: 860px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 2rem 1.5rem; }
  .project-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; gap: 1.75rem; }
}

@media (max-width: 720px) {
  .nav-links, .nav-resume { display: none; }
  .nav-toggle { display: flex; }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    padding: 1rem 1.5rem;
    gap: 1rem;
  }
}