/* ==========================================================================
   LAYOUT — layout.css
   Navigation, footer, responsive breakpoints.
   ========================================================================== */

/* ── Navigation ─────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  z-index: 1000;
  background: #000000;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  transition: transform 0.4s var(--ease);
}
.nav--hidden { transform: translateY(-100%); }

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

.nav__logo {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  color: #ffffff;
  text-decoration: none;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
}

.nav__item { position: relative; }

.nav__link {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 8px 14px;
  font-size: 0.8rem;
  font-weight: 500;
  color: rgba(255,255,255,0.45);
  text-decoration: none;
  letter-spacing: 0.02em;
  border-radius: var(--radius-sm);
  transition: color 0.2s ease;
}
.nav__link:hover,
.nav__link--active { color: rgba(255,255,255,0.9); }

.nav__arrow { font-size: 0.5em; transition: transform 0.2s ease; }

/* Dropdown */
.nav__dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  min-width: 210px;
  background: #0a0a0a;
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: var(--radius-lg);
  padding: 6px;
  box-shadow: 0 16px 48px rgba(0,0,0,0.7);
  list-style: none;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: all 0.2s var(--ease);
}
.nav__item:hover .nav__dropdown {
  opacity: 1; visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}
/* Bridge the gap between link and dropdown so hover doesn't break */
.nav__dropdown::before {
  content: '';
  position: absolute;
  top: -12px;
  left: 0;
  right: 0;
  height: 12px;
}
.nav__item:hover .nav__arrow { transform: rotate(180deg); }

.nav__dropdown-link {
  display: block;
  padding: 10px 14px;
  font-size: 0.78rem;
  color: rgba(255,255,255,0.5);
  text-decoration: none;
  border-radius: 5px;
  transition: all 0.15s ease;
}
.nav__dropdown-link:hover {
  color: #fff;
  background: rgba(255,255,255,0.04);
}
.nav__dropdown-desc {
  display: block;
  font-size: 0.65rem;
  color: var(--text-tertiary);
  margin-top: 2px;
}

/* Mobile Toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 24px;
  height: 24px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.nav__toggle-line {
  display: block;
  width: 100%;
  height: 1.5px;
  background: #ffffff;
  border-radius: 1px;
  transition: all 0.3s var(--ease);
  transform-origin: center;
}
.nav__toggle--open .nav__toggle-line:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav__toggle--open .nav__toggle-line:nth-child(2) { opacity: 0; }
.nav__toggle--open .nav__toggle-line:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ── Page Container ─────────────────────────────────────── */
.page {
  min-height: 100vh;
  padding-top: var(--nav-height);
}

/* ── Footer ─────────────────────────────────────────────── */
.footer {
  padding: 48px 0 32px;
  border-top: 1px solid var(--border);
}
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}
.footer__links {
  display: flex;
  gap: 24px;
  list-style: none;
}
.footer__link {
  font-size: 0.78rem;
  color: var(--text-tertiary);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: color 0.2s ease;
}
.footer__link:hover { color: var(--text-secondary); }
.footer__text {
  font-size: 0.72rem;
  color: var(--text-tertiary);
}

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 768px) {
  .nav__menu {
    position: fixed;
    top: var(--nav-height);
    right: 0; bottom: 0;
    width: 260px;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-6);
    background: #0a0a0a;
    border-left: 1px solid var(--border);
    transform: translateX(100%);
    transition: transform 0.4s var(--ease);
    overflow-y: auto;
  }
  .nav__menu--open { transform: translateX(0); }
  .nav__toggle { display: flex; }

  .nav__dropdown {
    position: static;
    transform: none;
    min-width: 100%;
    background: transparent;
    border: none;
    box-shadow: none;
    padding-left: var(--space-4);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s var(--ease);
  }
  .nav__item--expanded .nav__dropdown { max-height: 500px; }

  .container { padding: 0 20px; }
  .section { padding: 64px 0; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .footer__inner { flex-direction: column; gap: 16px; text-align: center; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .nav__inner { padding: 0 16px; }
}