/* ------------------------------------------------------------------ */
/* Header & navigation                                                  */
/* ------------------------------------------------------------------ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg-elevated) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-block: var(--space-3);
}

.nav__brand {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  white-space: nowrap;
}

.nav__toggle {
  display: none;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
}

.nav__menu {
  display: flex;
  gap: var(--space-4);
  flex: 1;
  justify-content: center;
}

.nav__menu a {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  padding-block: var(--space-1);
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.nav__menu a:hover,
.nav__menu a.is-active {
  color: var(--text);
  border-color: var(--accent-strong);
}

.nav__controls {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

@media (max-width: 780px) {
  .nav__toggle {
    display: inline-flex;
  }

  .nav__menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
  }

  .nav__menu.is-open {
    max-height: 420px;
  }

  .nav__menu li {
    border-top: 1px solid var(--border);
  }

  .nav__menu a {
    display: block;
    padding: var(--space-3) var(--space-4);
    border-bottom: none;
  }
}

/* ------------------------------------------------------------------ */
/* Sections                                                             */
/* ------------------------------------------------------------------ */
.section {
  padding-block: var(--space-6);
  scroll-margin-top: 5rem;
}

.hero {
  position: relative;
  scroll-margin-top: 5rem;
  padding-block: var(--space-6) calc(var(--space-6) + 60px);
  overflow: hidden;
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 700px;
}

.hero__title-row {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 6vw, 3.4rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 0;
}

.hero__kaomoji {
  display: none;
  font-size: clamp(1.4rem, 3.2vw, 1.8rem);
  color: var(--accent-strong);
}

[data-theme='light'] .hero__kaomoji {
  display: inline-block;
  animation: hero-wave 1.8s ease-in-out infinite;
  transform-origin: 70% 70%;
}

@keyframes hero-wave {
  0%, 100% { transform: rotate(0deg); }
  25% { transform: rotate(12deg); }
  75% { transform: rotate(-8deg); }
}

.hero__subtitle {
  font-size: clamp(1.1rem, 2.4vw, 1.4rem);
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: var(--space-3);
}

.hero__tagline {
  color: var(--text-muted);
  max-width: 60ch;
  margin-bottom: var(--space-4);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* ------------------------------------------------------------------ */
/* Skills / education grids                                             */
/* ------------------------------------------------------------------ */
.skills__grid,
.education__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-4);
}

.education__certs-title {
  margin-top: var(--space-5);
  margin-bottom: var(--space-3);
  font-size: 1.2rem;
  font-weight: 700;
}

/* ------------------------------------------------------------------ */
/* Contact                                                              */
/* ------------------------------------------------------------------ */
.contact__text {
  max-width: 60ch;
  color: var(--text-muted);
  margin-bottom: var(--space-4);
}

.contact__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* ------------------------------------------------------------------ */
/* Footer                                                               */
/* ------------------------------------------------------------------ */
.site-footer {
  border-top: 1px solid var(--border);
  padding-block: var(--space-4);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer__top {
  display: inline-flex;
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.footer__top:hover {
  color: var(--accent-strong);
}