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

:root {
  --bg:        #ffffff;
  --bg-alt:    #f8f9fa;
  --border:    #e9ecef;
  --text:      #1a1a2e;
  --muted:     #6c757d;
  --accent:    #2563eb;
  --accent-h:  #1d4ed8;
  --tag-bg:    #eff6ff;
  --tag-text:  #1e40af;
  --radius:    10px;
  --shadow:    0 1px 3px rgba(0,0,0,.06), 0 4px 16px rgba(0,0,0,.06);
  --nav-bg:    rgba(255,255,255,.85);
  --nav-h:     60px;
  --font:      'Inter', system-ui, sans-serif;
}

[data-theme="dark"] {
  --bg:        #0f1117;
  --bg-alt:    #161b22;
  --border:    #30363d;
  --text:      #e6edf3;
  --muted:     #8b949e;
  --accent:    #58a6ff;
  --accent-h:  #79c0ff;
  --tag-bg:    #1c2d4a;
  --tag-text:  #79c0ff;
  --shadow:    0 1px 3px rgba(0,0,0,.3), 0 4px 16px rgba(0,0,0,.3);
  --nav-bg:    rgba(15,17,23,.85);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 1rem;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
strong { font-weight: 600; }

/* ─── Layout ────────────────────────────────────────────── */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ─── Nav ───────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  transition: box-shadow .2s;
}
.nav.scrolled { box-shadow: var(--shadow); }

.nav__logo {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: -.5px;
}

.nav__links {
  display: flex;
  gap: 28px;
  font-size: .9rem;
  font-weight: 500;
  color: var(--muted);
}
.nav__links a { transition: color .15s; }
.nav__links a:hover { color: var(--text); }

/* ─── Hero ──────────────────────────────────────────────── */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-h) + 48px) 0 80px;
}

.hero__eyebrow {
  font-size: .9rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: .08em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.hero__name {
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 600;
  letter-spacing: -2px;
  line-height: 1.05;
  color: var(--text);
}

.hero__title {
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  font-weight: 300;
  color: var(--muted);
  margin-top: 8px;
  letter-spacing: -.3px;
}

.hero__sub {
  margin-top: 20px;
  max-width: 520px;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}

/* ─── Buttons ───────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 8px;
  font-size: .9rem;
  font-weight: 500;
  transition: background .15s, color .15s, border-color .15s;
  cursor: pointer;
}
.btn--primary {
  background: var(--accent);
  color: #fff;
  border: 1.5px solid var(--accent);
}
.btn--primary:hover { background: var(--accent-h); border-color: var(--accent-h); }
.btn--ghost {
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--border);
}
.btn--ghost:hover { border-color: #adb5bd; }

/* ─── Sections ──────────────────────────────────────────── */
.section { padding: 88px 0; }
.section--alt { background: var(--bg-alt); }

.section__label {
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 36px;
}

/* ─── About ─────────────────────────────────────────────── */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 48px;
  align-items: start;
}

.about__text p { color: var(--muted); margin-bottom: 16px; font-size: 1.05rem; }
.about__text p:last-child { margin-bottom: 0; }

.about__facts {
  list-style: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.about__facts li {
  display: flex;
  flex-direction: column;
  padding: 12px 16px;
  font-size: .875rem;
  border-bottom: 1px solid var(--border);
}
.about__facts li:last-child { border-bottom: none; }
.about__facts span {
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 2px;
}
.about__facts a { color: var(--accent); }
.about__facts a:hover { text-decoration: underline; }

/* ─── Skills ────────────────────────────────────────────── */
.skills__groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
}
.skills__group h4 {
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 14px;
}

/* ─── Tags ──────────────────────────────────────────────── */
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tags--sm .tag { font-size: .75rem; padding: 3px 10px; }
.tag {
  display: inline-block;
  padding: 5px 12px;
  background: var(--tag-bg);
  color: var(--tag-text);
  border-radius: 20px;
  font-size: .82rem;
  font-weight: 500;
}

/* ─── Projects ──────────────────────────────────────────── */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: box-shadow .2s, transform .2s;
}
.card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }

.card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.card__lang {
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 20px;
}
.card__lang--csharp { background: #ede9fe; color: #5b21b6; }
.card__lang--ts     { background: #dbeafe; color: #1d4ed8; }
.card__lang--js     { background: #fef9c3; color: #854d0e; }
.card__lang--py     { background: #dcfce7; color: #166534; }

[data-theme="dark"] .card__lang--csharp { background: #2d1f4a; color: #c4b5fd; }
[data-theme="dark"] .card__lang--ts     { background: #1c2d4a; color: #79c0ff; }
[data-theme="dark"] .card__lang--js     { background: #2d2a1f; color: #e3b341; }
[data-theme="dark"] .card__lang--py     { background: #1a2e22; color: #56d364; }

.card__link { color: var(--muted); transition: color .15s; }
.card__link:hover { color: var(--accent); }

.card h4 { font-size: 1rem; font-weight: 600; margin-bottom: 8px; }
.card p { font-size: .875rem; color: var(--muted); margin-bottom: 16px; line-height: 1.55; }

/* ─── Contact ───────────────────────────────────────────── */
.contact { text-align: center; }
.contact__text { color: var(--muted); font-size: 1.05rem; max-width: 480px; margin: 0 auto 36px; }

.contact__links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
}
.contact__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: .9rem;
  font-weight: 500;
  color: var(--text);
  transition: border-color .15s, color .15s;
}
.contact__item:hover { border-color: var(--accent); color: var(--accent); }

/* ─── Footer ────────────────────────────────────────────── */
.footer {
  padding: 28px 0;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: .825rem;
  color: var(--muted);
}

/* ─── Animations ────────────────────────────────────────── */
.fade-in {
  opacity: 0;
  transform: translateY(18px);
  animation: fadeUp .6s ease forwards;
}
.delay-1 { animation-delay: .1s; }
.delay-2 { animation-delay: .2s; }
.delay-3 { animation-delay: .35s; }
.delay-4 { animation-delay: .5s; }

@keyframes fadeUp {
  to { opacity: 1; transform: none; }
}

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .5s ease, transform .5s ease;
}
.reveal.visible { opacity: 1; transform: none; }

/* ─── Theme toggle ──────────────────────────────────────── */
.theme-toggle {
  background: none;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--muted);
  transition: border-color .15s, color .15s;
  flex-shrink: 0;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
.theme-toggle .icon-moon { display: block; }
.theme-toggle .icon-sun  { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun  { display: block; }

/* ─── Responsive ────────────────────────────────────────── */
@media (max-width: 680px) {
  .nav__links { display: none; }

  .about__grid {
    grid-template-columns: 1fr;
  }

  .hero__name { letter-spacing: -1px; }
}