/* Layout System */

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

/* Sections */
section {
  position: relative;
  width: 100%;
  min-height: auto;
  padding: var(--section-padding-y) 0;
}

section.full-viewport {
  height: 100vh;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--space-6);
}

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

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

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

@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;
  }
}

/* Flex utilities */
.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.flex-wrap {
  flex-wrap: wrap;
}

.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* Navigation */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  background: linear-gradient(180deg, rgba(10, 10, 10, 0.95) 0%, rgba(10, 10, 10, 0.7) 70%, transparent 100%);
  backdrop-filter: blur(10px);
  border-bottom: var(--border-width-thin) solid rgba(42, 42, 42, 0.3);
  transition: all var(--transition-base);
}

/* Keep links visible, just fade the background */
nav.hidden {
  background: linear-gradient(180deg, rgba(10, 10, 10, 0.3) 0%, transparent 100%);
  border-bottom-color: transparent;
}

/* Ensure links stay visible when nav is "hidden" */
nav.hidden .nav-logo,
nav.hidden .nav-links a {
  opacity: 1;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--container-padding);
  max-width: var(--container-max-width);
  margin: 0 auto;
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  gap: var(--space-6);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent-primary);
  transition: width var(--transition-base);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-text-primary);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  width: 30px;
  height: 24px;
  position: relative;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  position: absolute;
  height: 2px;
  width: 100%;
  background: var(--color-text-primary);
  border-radius: 2px;
  opacity: 1;
  left: 0;
  transition: all var(--transition-base);
}

.nav-toggle span:nth-child(1) { top: 0; }
.nav-toggle span:nth-child(2) { top: 11px; }
.nav-toggle span:nth-child(3) { top: 22px; }

.nav-toggle.active span:nth-child(1) {
  top: 11px;
  transform: rotate(135deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
  left: -60px;
}

.nav-toggle.active span:nth-child(3) {
  top: 11px;
  transform: rotate(-135deg);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }
  
  .nav-links {
    position: fixed;
    top: 65px;
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: var(--color-bg-secondary);
    padding: var(--space-6);
    gap: var(--space-4);
    border-bottom: var(--border-width-thin) solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-base);
  }
  
  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }
}

/* Footer */
footer {
  border-top: var(--border-width-thin) solid var(--color-border);
  padding: var(--space-8) 0;
  margin-top: var(--space-8);
  background-color: var(--color-bg-secondary);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

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

.footer-links {
  display: flex;
  gap: var(--space-5);
  list-style: none;
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-accent-primary);
}

@media (max-width: 640px) {
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}

/* ── Process Row (How We Work) ── */

.process-row {
  display: flex;
  gap: var(--space-6);
  justify-content: center;
}

@media (max-width: 768px) {
  .process-row {
    flex-direction: column;
    align-items: center;
  }
}