/* Layout */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-md);
}
.container-narrow {
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

section {
  padding: var(--section-gap) 0;
  position: relative;
}

/* Canvas Background */
.canvas-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}
.canvas-container canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
#canvas-layer-1 { z-index: 1; }
#canvas-layer-2 { z-index: 2; }

/* Main Content */
main {
  position: relative;
  z-index: 10;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-md);
  background: transparent;
  transition: background var(--duration-normal) var(--ease-out-expo),
              box-shadow var(--duration-normal) var(--ease-out-expo);
}
.nav.scrolled {
  background: var(--color-bg);
  box-shadow: var(--shadow-soft);
}
.dark-mode .nav.scrolled {
  background: var(--color-bg);
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}
.nav-logo img {
  height: 36px;
  width: 36px;
  object-fit: cover;
  border-radius: var(--radius-round);
}
.nav-logo span {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  letter-spacing: var(--ls-wide);
  color: var(--color-accent);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}
.nav-links a {
  font-size: var(--size-small);
  font-weight: var(--weight-medium);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--color-text-muted);
  transition: color var(--duration-fast);
  position: relative;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--color-accent);
}
.nav-controls {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}
.theme-toggle, .lang-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-round);
  color: var(--color-text-muted);
  font-size: 1.1rem;
  transition: all var(--duration-fast);
  border: 1px solid transparent;
}
.theme-toggle:hover, .lang-toggle:hover {
  color: var(--color-accent);
  border-color: var(--color-border);
}
.lang-toggle {
  font-size: var(--size-label);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--ls-wide);
  width: auto;
  padding: 0 0.6rem;
}

/* Mobile Nav */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
}
.nav-hamburger span {
  width: 24px;
  height: 1.5px;
  background: var(--color-text);
  transition: all var(--duration-normal);
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg);
    padding: var(--space-lg) var(--space-md);
    gap: var(--space-md);
    z-index: 99;
  }
  .nav-links.open a {
    font-size: var(--size-h3);
    text-transform: none;
    letter-spacing: 0;
    font-family: var(--font-heading);
  }
}

/* Grid Layouts */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* Text alignment */
.text-center { text-align: center; }
.text-left { text-align: left; }