/* ==========================================================================
   QASTCO Mobile Navigation — Slide-in Panel
   ========================================================================== */

.mobile-nav {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  max-width: 420px;
  background: var(--color-white);
  z-index: var(--z-overlay);
  transform: translateX(100%);
  transition: transform var(--duration-slow) cubic-bezier(0.32, 0.72, 0, 1);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  display: flex;
  flex-direction: column;
}

.mobile-nav--open {
  transform: translateX(0);
}

/* --- Overlay --- */

.mobile-nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  z-index: var(--z-overlay);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-slow) var(--ease-default),
              visibility var(--duration-slow) var(--ease-default);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
}

.mobile-nav-overlay--visible {
  opacity: 1;
  visibility: visible;
}

/* --- Mobile Nav Header (dark, matches site header) --- */

.mobile-nav__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  background: var(--color-dark);
  flex-shrink: 0;
}

.mobile-nav__header .site-header__logo-img {
  height: 36px;
  width: auto;
}

.mobile-nav__close {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  cursor: pointer;
  font-size: 22px;
  color: var(--color-white);
  border-radius: var(--radius-sm);
  transition: background var(--duration-fast) var(--ease-default);
}

.mobile-nav__close:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* --- Mobile Nav Body --- */

.mobile-nav__body {
  padding: var(--space-5) var(--space-5) 80px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* --- Mobile Nav Groups --- */

.mobile-nav__group {
  border-bottom: 1px solid var(--color-line);
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-2);
}

.mobile-nav__group:last-of-type {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.mobile-nav__group-title {
  font-size: 11px;
  font-weight: var(--font-weight-black);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-muted);
  margin: var(--space-3) 0 var(--space-1);
  padding: 0 var(--space-3);
}

.mobile-nav__group-title:first-child {
  margin-top: var(--space-1);
}

/* --- Accordion trigger --- */

.mobile-nav__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-3) var(--space-3);
  font-size: var(--text-base);
  font-weight: var(--font-weight-bold);
  color: var(--color-ink);
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-default),
              color var(--duration-fast) var(--ease-default);
  min-height: 48px;
}

.mobile-nav__trigger:hover {
  background: var(--color-soft);
}

.mobile-nav__trigger[aria-expanded="true"] {
  color: var(--color-primary);
}

.mobile-nav__trigger-arrow {
  font-size: 10px;
  color: var(--color-muted);
  transition: transform var(--duration-normal) var(--ease-default);
}

.mobile-nav__trigger[aria-expanded="true"] .mobile-nav__trigger-arrow {
  transform: rotate(180deg);
  color: var(--color-primary);
}

/* --- Accordion content (animated) --- */

.mobile-nav__sub {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height var(--duration-normal) var(--ease-default),
              opacity var(--duration-fast) var(--ease-default);
  padding-left: var(--space-2);
}

.mobile-nav__sub--open {
  max-height: 800px;
  opacity: 1;
}

/* --- Mobile Nav Links --- */

.mobile-nav__link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: var(--font-weight-semibold);
  color: var(--color-ink);
  text-decoration: none;
  min-height: 44px;
  transition: background var(--duration-fast) var(--ease-default),
              color var(--duration-fast) var(--ease-default);
}

.mobile-nav__link:hover,
.mobile-nav__link:active {
  background: var(--color-soft);
  color: var(--color-primary);
}

/* --- Category dots --- */

.mobile-nav__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.mobile-nav__dot--dm { background: #4F46E5; }
.mobile-nav__dot--dev { background: #16A34A; }
.mobile-nav__dot--sol { background: #EA580C; }
.mobile-nav__dot--ind { background: #DB2777; }
.mobile-nav__dot--gen { background: var(--color-muted); }

/* --- Mobile CTA (pushed to bottom) --- */

.mobile-nav__cta {
  display: block;
  width: 100%;
  text-align: center;
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-bold);
  font-size: var(--text-base);
  text-decoration: none;
  margin-top: auto;
  min-height: 48px;
  line-height: 48px;
  transition: background var(--duration-fast) var(--ease-default),
              transform var(--duration-fast) var(--ease-default);
}

.mobile-nav__cta:hover {
  background: var(--color-primary-dark);
}

.mobile-nav__cta:active {
  transform: scale(0.98);
}

@media (max-width: 420px) {
  .mobile-nav {
    max-width: 100%;
  }
}

@media (min-width: 1024px) {
  .mobile-nav,
  .mobile-nav-overlay {
    display: none !important;
  }
}