/* ============================================
   LAYOUT — Header, Footer, Grid, Container
   ============================================ */

/* ══════════════════════════════════════
   CONTAINER
   ══════════════════════════════════════ */

.container {
  width: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container-narrow {
  max-width: var(--container-lg);
}

/* ══════════════════════════════════════
   HEADER / NAVIGATION
   ══════════════════════════════════════ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: var(--z-fixed);
  transition: all var(--transition-base);
}

.header.scrolled {
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  position: relative;
}

.logo-mark {
  width: 44px;
  height: 44px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.logo-ring {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.logo-ring-outer {
  animation: logoSpin 20s linear infinite;
  transform-origin: center;
}

.logo-ring-inner {
  animation: logoSpinReverse 15s linear infinite;
  transform-origin: center;
}

.logo-letter-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1px;
  z-index: 1;
  position: relative;
}

.logo-bracket {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: var(--font-bold);
  background: var(--gradient-secondary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  opacity: 0.7;
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  line-height: 1;
}

.logo-letter {
  font-family: var(--font-sans);
  font-size: 18px;
  font-weight: var(--font-extrabold);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  transition: all 0.3s ease;
}

.logo-text {
  display: flex;
  align-items: baseline;
  gap: 0;
  line-height: 1;
}

.logo-name {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  letter-spacing: var(--tracking-tight);
  transition: color var(--transition-fast);
}

.logo-dot {
  font-size: var(--text-2xl);
  font-weight: var(--font-extrabold);
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  transition: transform 0.3s ease;
  display: inline-block;
}

.logo-surname {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--accent);
  letter-spacing: var(--tracking-wide);
  font-family: var(--font-mono);
  opacity: 0.85;
  transition: all var(--transition-fast);
}

/* Logo Hover Effects */
.logo:hover .logo-ring {
  transform: scale(1.08);
}

.logo:hover .logo-ring-outer {
  animation-duration: 4s;
}

.logo:hover .logo-bracket {
  opacity: 1;
}

.logo:hover .logo-bracket-left {
  transform: translateX(-2px);
}

.logo:hover .logo-bracket-right {
  transform: translateX(2px);
}

.logo:hover .logo-dot {
  transform: scale(1.3);
}

.logo:hover .logo-surname {
  opacity: 1;
  color: var(--accent-hover);
}

/* Logo Mark Glow on Hover */
.logo-mark::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
  z-index: 0;
}

.logo:hover .logo-mark::after {
  opacity: 1;
}

/* Logo Animations */
@keyframes logoSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes logoSpinReverse {
  from { transform: rotate(360deg); }
  to { transform: rotate(0deg); }
}


/* Nav Links */
.nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
  background: var(--bg-glass);
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Theme Toggle */
.theme-toggle {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  background: none;
  border: none;
}

.theme-toggle:hover {
  color: var(--text-primary);
  background: var(--bg-glass);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-spring);
}

.theme-toggle:hover svg {
  transform: rotate(30deg);
}

.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }

[data-theme="light"] .theme-toggle .icon-sun { display: block; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }

/* Mobile Menu Toggle */
.mobile-menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  background: none;
  border: none;
  position: relative;
  z-index: calc(var(--z-overlay) + 1);
}

.hamburger {
  width: 20px;
  height: 14px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  transform-origin: center;
}

.mobile-menu-btn.active .hamburger span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.mobile-menu-btn.active .hamburger span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.mobile-menu-btn.active .hamburger span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ══════════════════════════════════════
   MOBILE MENU
   ══════════════════════════════════════ */

.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  z-index: var(--z-overlay);
  padding: calc(var(--header-height) + var(--space-8)) var(--space-6) var(--space-8);
  opacity: 0;
  transform: translateY(-10px);
  transition: all var(--transition-base);
  overflow-y: auto;
}

.mobile-nav.open {
  display: flex;
  flex-direction: column;
  opacity: 1;
  transform: translateY(0);
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-4);
  font-size: var(--text-lg);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.mobile-nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-glass);
}

.mobile-nav-socials {
  display: flex;
  gap: var(--space-3);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border);
}

/* ══════════════════════════════════════
   FOOTER
   ══════════════════════════════════════ */

.footer {
  border-top: 1px solid var(--border);
  padding: var(--space-16) 0 var(--space-8);
  background: var(--bg-secondary);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.footer-brand p {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  max-width: 300px;
  line-height: var(--leading-relaxed);
}

.footer-column h4 {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-link {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.footer-socials {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-8);
  border-top: 1px solid var(--border);
}

.footer-copyright {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

.footer-bottom-links {
  display: flex;
  gap: var(--space-6);
}

/* ══════════════════════════════════════
   SECTION
   ══════════════════════════════════════ */

.section {
  padding: var(--space-24) 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.section-header .section-subtitle {
  margin: 0 auto;
}

/* ══════════════════════════════════════
   GRID SYSTEMS
   ══════════════════════════════════════ */

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

/* ══════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════ */

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-4);
  }

  .nav {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .section {
    padding: var(--space-16) 0;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}