/* ==========================================================================
   Layout — Header, Navigation, Hero, Home Sections, Footer
   ========================================================================== */

/* --- Header & Navigation --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(26, 26, 46, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-container {
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 0 var(--site-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.site-logo {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.05em;
}

.site-logo:hover {
  color: var(--accent);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 0.25rem;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  transition: all var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
  color: #fff;
  background: var(--accent-glow);
}

.lang-switcher {
  display: flex;
  gap: 0.25rem;
  padding-left: 1rem;
  border-left: 1px solid var(--border);
}

.lang-link {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  transition: all var(--transition-fast);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.lang-link:hover {
  color: var(--text-primary);
}

.lang-link.active {
  color: var(--accent);
  background: var(--accent-glow);
}

/* Hamburger menu button */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  z-index: 110;
}

.hamburger {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  position: relative;
  transition: background var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  left: 0;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: transform var(--transition);
}

.hamburger::before { top: -7px; }
.hamburger::after { top: 7px; }

.hamburger.active {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .hamburger {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .hamburger::before {
  transform: rotate(45deg);
  top: 0;
}

.nav-toggle[aria-expanded="true"] .hamburger::after {
  transform: rotate(-45deg);
  top: 0;
}

/* --- Hero Section --- */
.hero {
  text-align: center;
  padding: 8rem 0 5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: radial-gradient(ellipse at center, #212145 0%, var(--bg-primary) 70%);
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}

.hero-portrait {
  width: 280px;
  height: 280px;
  margin-bottom: 0.75rem;
  flex-shrink: 0;
}

.hero-portrait img {
  width: 280px;
  height: 280px;
  min-width: 280px;
  min-height: 280px;
  max-width: none;
  border-radius: 50%;
  object-fit: cover;
  object-position: center 15%;
  border: 2px solid var(--accent);
  box-shadow: 0 0 50px rgba(0, 212, 255, 0.12);
  transition: box-shadow var(--transition);
}

.hero-portrait img:hover {
  box-shadow: 0 0 70px rgba(0, 212, 255, 0.25);
}

.hero-name {
  font-size: 3.5rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.025em;
}

.hero-tagline {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent);
  letter-spacing: 0.08em;
}

.cursor {
  animation: blink 1s step-end infinite;
  color: var(--accent);
  margin-left: 2px;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.hero-intro {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.8;
}

/* --- Home Sections --- */
.home-section {
  margin-top: 5rem;
}

.section-title {
  font-size: 1.25rem;
  color: #fff;
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

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

.footer-container {
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 2rem var(--site-padding);
  text-align: center;
}

.footer-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Mobile nav overlay */
.nav-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 90;
}

.nav-overlay.active {
  display: block;
}