/* ══════════════════════════════════
   NAVBAR
   ══════════════════════════════════ */

.osb-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 9999;
  height: var(--osb-nav-height);
  background: var(--osb-charcoal);
  border-bottom: 1px solid var(--osb-border);
  transition: background 0.35s ease, box-shadow 0.35s ease, height 0.35s ease;
  font-family: var(--osb-font-body);
}

.osb-nav.osb-nav--scrolled {
  height: 74px;
  background: rgba(17, 17, 17, 0.97);
  box-shadow: 0 2px 30px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.osb-nav-spacer {
  height: var(--osb-nav-height);
}

.osb-nav__container {
  max-width: var(--osb-container-max);
  margin: 0 auto;
  padding: 0 48px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.osb-nav__logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.osb-nav__logo img {
  height: 52px;
  width: auto;
  transition: height 0.35s ease;
}

.osb-nav.osb-nav--scrolled .osb-nav__logo img {
  height: 42px;
}

/* Desktop Links */
.osb-nav__links {
  display: flex;
  align-items: center;
  gap: 6px;
}

.osb-nav__links > li {
  position: relative;
}

.osb-nav__link {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 10px 18px;
  font-family: var(--osb-font-heading);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--osb-silver-light);
  transition: color 0.25s ease;
  white-space: nowrap;
  cursor: pointer;
}

.osb-nav__link:hover,
.osb-nav__link:focus {
  color: var(--osb-brass);
}

.osb-nav__link--active {
  color: var(--osb-brass);
}

/* Dropdown Chevron */
.osb-nav__chevron {
  width: 10px;
  height: 10px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
  transition: transform 0.25s ease;
}

.osb-nav__dropdown-parent:hover .osb-nav__chevron {
  transform: rotate(180deg);
}

/* Dropdown Menu */
.osb-nav__dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 280px;
  padding: 12px 0;
  background: var(--osb-graphite);
  border: 1px solid var(--osb-border);
  border-top: 2px solid var(--osb-brass);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
}

.osb-nav__dropdown-parent:hover .osb-nav__dropdown,
.osb-nav__dropdown-parent:focus-within .osb-nav__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.osb-nav__dropdown-link {
  display: block;
  padding: 12px 24px;
  font-family: var(--osb-font-body);
  font-size: 14px;
  font-weight: 400;
  color: var(--osb-silver);
  transition: color 0.2s ease, background 0.2s ease, padding-left 0.2s ease;
  letter-spacing: 0.01em;
}

.osb-nav__dropdown-link:hover {
  color: var(--osb-brass);
  background: rgba(179, 155, 106, 0.06);
  padding-left: 30px;
}

/* CTA Button */
.osb-nav__cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: 20px;
  padding: 12px 28px;
  font-family: var(--osb-font-heading);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--osb-charcoal);
  background: var(--osb-brass);
  border: none;
  cursor: pointer;
  transition: background 0.25s ease, transform 0.15s ease;
  white-space: nowrap;
  flex-shrink: 0;
}

.osb-nav__cta:hover {
  background: var(--osb-brass-hover);
  transform: translateY(-1px);
}

.osb-nav__cta-arrow {
  width: 14px;
  height: 14px;
  stroke: var(--osb-charcoal);
  stroke-width: 2;
  fill: none;
  transition: transform 0.25s ease;
}

.osb-nav__cta:hover .osb-nav__cta-arrow {
  transform: translateX(3px);
}

/* Mobile Toggle */
.osb-nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  gap: 6px;
}

.osb-nav__toggle-bar {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--osb-silver-light);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.osb-nav__toggle.osb-nav__toggle--open .osb-nav__toggle-bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.osb-nav__toggle.osb-nav__toggle--open .osb-nav__toggle-bar:nth-child(2) {
  opacity: 0;
}

.osb-nav__toggle.osb-nav__toggle--open .osb-nav__toggle-bar:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Menu */
.osb-nav__mobile {
  display: none;
  position: fixed;
  top: var(--osb-nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--osb-charcoal);
  z-index: 9998;
  overflow-y: auto;
  padding: 32px 24px 40px;
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.osb-nav__mobile.osb-nav__mobile--open {
  opacity: 1;
  transform: translateY(0);
}

.osb-nav__mobile-list > li {
  border-bottom: 1px solid rgba(179, 155, 106, 0.1);
}

.osb-nav__mobile-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 4px;
  font-family: var(--osb-font-heading);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--osb-silver-light);
  transition: color 0.2s ease;
}

.osb-nav__mobile-link:hover {
  color: var(--osb-brass);
}

.osb-nav__mobile-sub {
  padding: 0 0 12px 16px;
  display: none;
}

.osb-nav__mobile-sub.osb-nav__mobile-sub--open {
  display: block;
}

.osb-nav__mobile-sub-link {
  display: block;
  padding: 12px 4px;
  font-family: var(--osb-font-body);
  font-size: 15px;
  color: var(--osb-concrete-light);
  transition: color 0.2s ease;
}

.osb-nav__mobile-sub-link:hover {
  color: var(--osb-brass);
}

.osb-nav__mobile-chevron {
  width: 14px;
  height: 14px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
  transition: transform 0.25s ease;
}

.osb-nav__mobile-chevron--open {
  transform: rotate(180deg);
}

.osb-nav__mobile-cta {
  display: block;
  margin-top: 32px;
  padding: 16px 28px;
  font-family: var(--osb-font-heading);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-align: center;
  color: var(--osb-charcoal);
  background: var(--osb-brass);
  transition: background 0.25s ease;
}

.osb-nav__mobile-cta:hover {
  background: var(--osb-brass-hover);
}

/* Responsive */
@media (max-width: 1024px) {
  .osb-nav__container { padding: 0 28px; }
  .osb-nav__links, .osb-nav__cta { display: none; }
  .osb-nav__toggle { display: flex; }
  .osb-nav__mobile { display: block; pointer-events: none; }
  .osb-nav__mobile.osb-nav__mobile--open { pointer-events: auto; }
}

@media (max-width: 640px) {
  .osb-nav__container { padding: 0 20px; }
  .osb-nav__logo img { height: 40px; }
  .osb-nav.osb-nav--scrolled .osb-nav__logo img { height: 36px; }
}

@media (min-width: 1600px) {
  .osb-nav__container { max-width: var(--osb-container-wide); padding: 0 60px; }
}