/* ═══════════════════════════════════════════════════
   RESPONSIVE.CSS — Breakpoint System
   ═══════════════════════════════════════════════════ */

/* ─── Navigation ─── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: var(--z-header);
  transition: all var(--duration-normal) var(--ease-out);
}

.nav.scrolled {
  background: rgba(7, 7, 7, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

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

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-display);
  font-size: 1.6rem;
  letter-spacing: 0.06em;
  color: var(--text-primary);
  z-index: var(--z-header);
}

.nav__logo-accent {
  color: var(--accent);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav__link {
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--text-secondary);
  transition: color var(--duration-fast) var(--ease-out);
  position: relative;
}

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

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--duration-normal) var(--ease-out);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav__cta {
  padding: 0.6rem 1.5rem;
  background: var(--accent);
  color: var(--white);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--ls-wider);
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast) var(--ease-out);
}

.nav__cta:hover {
  background: var(--accent-bright);
  box-shadow: var(--shadow-red);
}

/* Mobile menu trigger */
.nav__trigger {
  display: none;
  width: 48px;
  height: 48px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  z-index: var(--z-header);
  cursor: pointer;
}

.nav__trigger-line {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--duration-normal) var(--ease-out);
  transform-origin: center;
}

.nav__trigger.active .nav__trigger-line:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}
.nav__trigger.active .nav__trigger-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav__trigger.active .nav__trigger-line:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* ─── Mobile Menu ─── */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-header) - 1);
  background: var(--bg-main);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-slow) var(--ease-out);
}

.mobile-menu.active {
  opacity: 1;
  visibility: visible;
}

.mobile-menu__link {
  font-family: var(--font-display);
  font-size: clamp(2rem, 6vw, 3.5rem);
  text-transform: uppercase;
  color: var(--text-secondary);
  padding: var(--space-sm) 0;
  transition: color var(--duration-fast) var(--ease-out), transform var(--duration-fast) var(--ease-out);
  opacity: 0;
  transform: translateY(20px);
}

.mobile-menu.active .mobile-menu__link {
  opacity: 1;
  transform: translateY(0);
}

.mobile-menu__link:hover,
.mobile-menu__link.active {
  color: var(--text-primary);
}

.mobile-menu__link.active {
  color: var(--accent);
}

.mobile-menu__links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  margin-bottom: var(--space-2xl);
}

.mobile-menu__cta {
  opacity: 0;
  transform: translateY(20px);
}

.mobile-menu.active .mobile-menu__cta {
  opacity: 1;
  transform: translateY(0);
  transition-delay: 0.5s;
}

.mobile-menu__social {
  position: absolute;
  bottom: var(--space-2xl);
  display: flex;
  gap: var(--space-xl);
  opacity: 0;
}

.mobile-menu.active .mobile-menu__social {
  opacity: 1;
  transition-delay: 0.6s;
}

.mobile-menu__social a {
  color: var(--text-muted);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  transition: color var(--duration-fast) var(--ease-out);
}

.mobile-menu__social a:hover { color: var(--accent); }

/* ─── Footer ─── */
.footer {
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  padding: var(--space-4xl) 0 0;
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--space-3xl);
  padding-bottom: var(--space-3xl);
}

.footer__brand {
  max-width: 320px;
}

.footer__logo {
  font-family: var(--font-display);
  font-size: 1.8rem;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-md);
}

.footer__logo-accent { color: var(--accent); }

.footer__desc {
  font-size: var(--fs-small);
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
  line-height: var(--lh-body);
}

.footer__heading {
  font-family: var(--font-body);
  font-size: var(--fs-xs);
  font-weight: var(--fw-bold);
  letter-spacing: var(--ls-wider);
  text-transform: uppercase;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
}

.footer__link {
  display: block;
  font-size: var(--fs-small);
  color: var(--text-secondary);
  padding: 0.35rem 0;
  transition: color var(--duration-fast) var(--ease-out);
}

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

.footer__contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  font-size: var(--fs-small);
  color: var(--text-secondary);
  padding: 0.35rem 0;
}

.footer__contact-item svg {
  width: 16px;
  height: 16px;
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 3px;
}

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--border);
  font-size: var(--fs-xs);
  color: var(--text-muted);
}

.footer__bottom-links {
  display: flex;
  gap: var(--space-lg);
}

.footer__bottom-links a {
  color: var(--text-muted);
  transition: color var(--duration-fast) var(--ease-out);
}

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

/* ─── Desktop: 1024px+ ─── */
@media (min-width: 1024px) {
  .nav__links { display: flex; }
  .nav__trigger { display: none; }
  .mobile-menu { display: none; }
}

/* ─── Tablet: 768px–1023px ─── */
@media (max-width: 1023px) {
  .nav__links { display: none; }
  .nav__cta { display: none; }
  .nav__trigger { display: flex; }

  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
  }

  .footer__brand {
    grid-column: 1 / -1;
    max-width: 100%;
  }
}

/* ─── Mobile: <768px ─── */
@media (max-width: 767px) {
  :root {
    --header-height: 60px;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

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

  .footer__bottom-links {
    flex-wrap: wrap;
    justify-content: center;
  }

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

  .page-hero {
    min-height: 40vh;
    padding-bottom: var(--space-2xl);
  }
}

/* ─── Small Mobile: <480px ─── */
@media (max-width: 479px) {
  .btn { padding: 0.7rem 1.5rem; }
  .btn--lg { padding: 0.9rem 2rem; }
}