/* ================================================================
   LAYOUT — Containers, Grid, Header, Footer, Responsive
   ================================================================ */

/* ---- Containers ---- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

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

/* ---- Section Spacing ---- */
.section {
  padding: var(--space-4xl) 0;
}

.section--sm {
  padding: var(--space-2xl) 0;
}

.section--lg {
  padding: var(--space-5xl) 0;
}

.section--dark {
  background: var(--color-ink);
}

.section--elevated {
  background: var(--bg-secondary);
}

/* ---- Section Headers ---- */
.section-header {
  margin-bottom: var(--space-2xl);
}

.section-header--center {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-body);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  text-transform: uppercase;
  letter-spacing: var(--ls-widest);
  color: var(--text-accent);
  margin-bottom: var(--space-md);
}

.section-label::before {
  content: '';
  width: 20px;
  height: 1px;
  background: var(--color-hinoki);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, var(--fs-3xl));
  font-weight: var(--fw-light);
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.section-subtitle {
  font-family: var(--font-accent);
  font-size: var(--fs-lg);
  font-style: italic;
  color: var(--text-muted);
  font-weight: var(--fw-light);
}

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

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

.grid--auto-fit {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* ---- Header ---- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  display: flex;
  align-items: center;
  padding: 0 var(--gutter);
  transition: background var(--duration-normal) var(--ease-smooth),
              border-color var(--duration-normal) var(--ease-smooth),
              backdrop-filter var(--duration-normal) var(--ease-smooth);
  border-bottom: 1px solid transparent;
}

.site-header.scrolled {
  background: rgba(11, 11, 10, 0.88);
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  border-bottom-color: var(--border-subtle);
}

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

/* ---- Logo ---- */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  z-index: 1001;
}

.logo-mark {
  font-size: 1.6rem;
  line-height: 1;
  opacity: 0.7;
}

.logo-text {
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: var(--fw-light);
  letter-spacing: var(--ls-wide);
  color: var(--text-primary);
}

.logo-sub {
  font-family: var(--font-body);
  font-size: 0.55rem;
  text-transform: uppercase;
  letter-spacing: var(--ls-widest);
  color: var(--text-muted);
  display: block;
  margin-top: 1px;
}

/* ---- Navigation ---- */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav-links {
  display: flex;
  gap: var(--space-lg);
  align-items: center;
}

.nav-link {
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: var(--fw-regular);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--text-muted);
  text-decoration: none;
  padding: var(--space-xs) 0;
  position: relative;
  transition: color var(--duration-fast) var(--ease-smooth);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-hinoki);
  transition: width var(--duration-normal) var(--ease-out-expo);
}

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

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

.nav-cta {
  font-family: var(--font-body);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  text-transform: uppercase;
  letter-spacing: var(--ls-wider);
  color: var(--color-ink);
  background: var(--color-hinoki);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background var(--duration-fast) var(--ease-smooth),
              transform var(--duration-fast) var(--ease-smooth);
}

.nav-cta:hover {
  background: var(--color-amber);
  transform: translateY(-1px);
}

/* ---- Mobile Nav Toggle ---- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 36px;
  height: 36px;
  gap: 5px;
  z-index: 1001;
  cursor: pointer;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--duration-normal) var(--ease-out-expo),
              opacity var(--duration-fast) var(--ease-smooth);
  transform-origin: center;
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(4.5px, 4.5px);
}

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

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(4.5px, -4.5px);
}

/* ---- Mobile Overlay ---- */
.mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(11, 11, 10, 0.96);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  z-index: 999;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--space-lg);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-smooth);
}

.mobile-overlay.open {
  display: flex;
  opacity: 1;
}

.mobile-overlay .nav-link {
  font-family: var(--font-display);
  font-size: var(--fs-2xl);
  letter-spacing: var(--ls-wide);
  text-transform: none;
  color: var(--text-secondary);
}

.mobile-overlay .nav-link:hover,
.mobile-overlay .nav-link.active {
  color: var(--text-accent);
}

.mobile-overlay .nav-cta {
  margin-top: var(--space-lg);
  font-size: var(--fs-sm);
  padding: var(--space-md) var(--space-2xl);
}

/* ---- Footer ---- */
.site-footer {
  background: var(--color-ink);
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-brand {
  max-width: 320px;
}

.footer-brand .logo {
  margin-bottom: var(--space-md);
}

.footer-brand p {
  font-size: var(--fs-sm);
  color: var(--text-muted);
  line-height: var(--lh-relaxed);
}

.footer-heading {
  font-family: var(--font-body);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  text-transform: uppercase;
  letter-spacing: var(--ls-widest);
  color: var(--text-accent);
  margin-bottom: var(--space-lg);
}

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

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

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

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

.footer-copy {
  font-size: var(--fs-xs);
  color: var(--color-stone);
}

.footer-socials {
  display: flex;
  gap: var(--space-md);
}

.footer-socials a {
  font-size: var(--fs-sm);
  color: var(--color-stone);
  transition: color var(--duration-fast) var(--ease-smooth);
}

.footer-socials a:hover {
  color: var(--text-accent);
}

/* ================================================================
   RESPONSIVE BREAKPOINTS
   ================================================================ */
@media (max-width: 1024px) {
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .main-nav {
    display: none;
  }

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

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

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

  .section {
    padding: var(--space-2xl) 0;
  }

  .section--lg {
    padding: var(--space-3xl) 0;
  }
}