:root {
  --bg:          #f7f7fb;
  --surface:     #ffffff;
  --foreground:  #16162a;
  --primary:     #4a3bca;
  --primary-10:  rgba(74, 59, 202, 0.10);
  --primary-20:  rgba(74, 59, 202, 0.20);
  --muted-fg:    #7c7ca8;
  --border:      #e3e3ef;
  --secondary:   #f0f0f8;
  --shadow-sm:   0 1px 2px rgba(0,0,0,.05);
  --shadow-md:   0 4px 12px rgba(0,0,0,.07);
  --shadow-lg:   0 12px 28px rgba(0,0,0,.10);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--foreground);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── HEADER ─────────────────────────────────────── */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 56px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 32px;
  gap: 24px;
}

.header-logo {
  font-size: 14px;
  font-weight: 600;
  color: var(--foreground);
  text-decoration: none;
  white-space: nowrap;
  margin-right: auto;
}

nav {
  display: flex;
  align-items: center;
  gap: 2px;
}

nav a {
  font-size: 13px;
  color: var(--muted-fg);
  text-decoration: none;
  padding: 5px 10px;
  transition: color .15s;
  white-space: nowrap;
}
nav a:hover, nav a.active { color: var(--foreground); }

.lang-switcher {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  font-weight: 500;
  white-space: nowrap;
}

.lang-option {
  color: var(--muted-fg);
  text-decoration: none;
  padding: 2px 4px;
  transition: color .15s;
}
.lang-option:hover { color: var(--foreground); }
.lang-option.active { color: var(--foreground); font-weight: 600; }

.lang-sep { color: var(--border); }

/* ── LAYOUT ─────────────────────────────────────── */
main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 40px;
}

section { padding: 80px 0; }
section + section { border-top: 1px solid var(--border); }

/* ── TYPOGRAPHY ─────────────────────────────────── */
.label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 10px;
}

.section-title {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--foreground);
  margin-bottom: 8px;
  line-height: 1.2;
}

.section-desc {
  font-size: 14px;
  color: var(--muted-fg);
  margin-bottom: 40px;
  max-width: 620px;
  line-height: 1.65;
}

/* ── HERO ────────────────────────────────────────── */
#hero {
  padding: 96px 0 80px;
  border-top: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--primary);
  background: var(--primary-10);
  padding: 4px 12px;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 46px;
  font-weight: 700;
  letter-spacing: -.03em;
  color: var(--foreground);
  line-height: 1.08;
  margin-bottom: 20px;
}

.hero-subtitle {
  font-size: 16px;
  color: var(--muted-fg);
  margin-bottom: 40px;
  max-width: 500px;
  line-height: 1.7;
}

.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }

/* ── BUTTONS ─────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  padding: 10px 20px;
  text-decoration: none;
  transition: all .15s;
  cursor: pointer;
  border: none;
  font-family: inherit;
}

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: #3a2db0; }

.btn-outline {
  background: var(--surface);
  color: var(--foreground);
  border: 1px solid var(--border);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

/* ── CARDS ───────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  transition: all .2s;
}
.card:hover {
  border-color: var(--primary-20);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

/* ── GRIDS ───────────────────────────────────────── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }

/* ── VALUE CARDS ─────────────────────────────────── */
.value-card { display: flex; flex-direction: column; gap: 12px; }

.icon-box {
  width: 32px;
  height: 32px;
  background: var(--primary-10);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.card-title { font-size: 14px; font-weight: 600; color: var(--foreground); }
.card-desc  { font-size: 13px; color: var(--muted-fg); line-height: 1.65; }

/* ── PROJECT CARDS ───────────────────────────────── */
.project-card { display: flex; flex-direction: column; gap: 12px; height: 100%; }

.project-period {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted-fg);
}

.role-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-10);
  padding: 2px 8px;
}

.project-title { font-size: 15px; font-weight: 600; color: var(--foreground); }

.tags { display: flex; flex-wrap: wrap; gap: 5px; margin-top: auto; padding-top: 8px; }

.tag {
  font-size: 11px;
  font-weight: 500;
  padding: 2px 8px;
  background: var(--secondary);
  color: var(--muted-fg);
  border: 1px solid var(--border);
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  font-weight: 500;
  color: var(--primary);
  text-decoration: none;
  margin-top: auto;
}

/* ── TIMELINE ────────────────────────────────────── */
.timeline-item {
  display: flex;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
}
.timeline-item:last-child { border-bottom: none; }

.timeline-date {
  width: 148px;
  flex-shrink: 0;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted-fg);
  padding-top: 2px;
  line-height: 1.9;
}

.tl-title    { font-size: 15px; font-weight: 600; color: var(--foreground); margin-bottom: 3px; }
.tl-company  { font-size: 13px; font-weight: 500; color: var(--primary); margin-bottom: 12px; }
.tl-desc     { font-size: 13px; color: var(--muted-fg); line-height: 1.65; }
.tl-desc ul  { margin-top: 8px; padding-left: 16px; }
.tl-desc li  { margin-bottom: 4px; }

/* ── SKILLS ──────────────────────────────────────── */
.skills-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.skill-group-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted-fg);
  margin-bottom: 16px;
}

.skill-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}
.skill-row:last-child { border-bottom: none; }

.skill-name  { font-size: 13px; font-weight: 500; }
.skill-meta  { display: flex; align-items: center; gap: 8px; }
.skill-years { font-size: 11px; font-weight: 600; color: var(--muted-fg); }
.bar-track   { width: 64px; height: 3px; background: var(--border); }
.bar-fill    { height: 100%; background: var(--primary); }

/* ── CONTACT ─────────────────────────────────────── */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

.contact-link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--foreground);
  transition: all .15s;
  box-shadow: var(--shadow-sm);
}
.contact-link:hover { border-color: var(--primary); color: var(--primary); }

.contact-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--muted-fg);
  margin-bottom: 2px;
}
.contact-link:hover .contact-label { color: inherit; }
.contact-value { font-size: 13px; font-weight: 500; }

/* ── FOOTER ──────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 32px 40px;
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-copy { font-size: 12px; color: var(--muted-fg); }

.footer-links { display: flex; gap: 16px; }
.footer-links a {
  font-size: 12px;
  color: var(--muted-fg);
  text-decoration: none;
  transition: color .15s;
}
.footer-links a:hover { color: var(--foreground); }

/* ── CERT ITEMS ──────────────────────────────────── */
.cert-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
}
.cert-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  background: var(--primary-10);
  color: var(--primary);
  white-space: nowrap;
}
.cert-badge.wip {
  background: var(--secondary);
  color: var(--muted-fg);
}
.cert-name { font-size: 13px; font-weight: 500; color: var(--foreground); }

/* ── MOBILE ──────────────────────────────────────── */
@media (max-width: 768px) {
  header { padding: 0 20px; }
  nav    { display: none; }
  main   { padding: 0 20px; }

  .hero-title    { font-size: 32px; }
  .hero-subtitle { font-size: 15px; }

  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .skills-grid     { grid-template-columns: 1fr; }
  .contact-grid    { grid-template-columns: 1fr; }

  .timeline-item { flex-direction: column; gap: 4px; }
  .timeline-date { width: auto; }

  section { padding: 56px 0; }
  footer  { flex-direction: column; gap: 12px; text-align: center; }
}