/* ==========================================
   Layout — Architectural Framework
   ========================================== */

.app-shell {
  display: grid;
  min-height: 100vh;
  min-height: 100dvh;
  grid-template-rows: 1fr auto;
  grid-template-areas: "content" "nav";
}

/* ---- Navigation ---- */
.app-nav {
  grid-area: nav;
  background: var(--bg-dark);
  background-image:
    linear-gradient(180deg, rgba(184, 134, 11, 0.06) 0%, transparent 40%),
    linear-gradient(0deg, rgba(0, 0, 0, 0.2) 0%, transparent 30%);
  border-top: 3px solid var(--accent-gold-dark);
  z-index: 100;
  position: relative;
}

/* Gold accent line atop nav */
.app-nav::before {
  content: '';
  position: absolute;
  top: -3px;
  left: 20%;
  right: 20%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--accent-gold-light), var(--accent-gold), var(--accent-gold-light), transparent);
}

.nav-list {
  display: flex;
  justify-content: space-around;
  align-items: center;
  height: var(--nav-height-mobile);
  padding: 0 var(--space-sm);
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-md);
  color: var(--text-inverse);
  opacity: 0.6;
  transition: all var(--transition-normal);
  text-decoration: none;
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-family: var(--font-ui);
  position: relative;
}

.nav-item:hover {
  opacity: 0.9;
  background: rgba(184, 134, 11, 0.12);
}

.nav-item.active {
  opacity: 1;
  color: var(--accent-gold-light);
  background: rgba(184, 134, 11, 0.15);
}

/* Active indicator dot */
.nav-item.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent-gold-light);
}

.nav-icon {
  width: 22px;
  height: 22px;
  fill: currentColor;
}

/* ---- Main content ---- */
.app-content {
  grid-area: content;
  overflow-y: auto;
  padding: var(--space-lg) var(--space-md);
  background:
    radial-gradient(ellipse at 15% 15%, rgba(184, 134, 11, 0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 85% 80%, rgba(138, 68, 34, 0.03) 0%, transparent 50%);
}

.page-container {
  max-width: var(--content-max-width);
  margin: 0 auto;
}

.page-header {
  text-align: center;
  margin-bottom: var(--space-xl);
  position: relative;
}

.page-title {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: var(--space-xs);
  letter-spacing: 0.02em;
}

.page-subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-style: italic;
  letter-spacing: 0.01em;
}

/* ---- Desktop layout — slim icon rail ---- */
@media (min-width: 768px) {
  .app-shell {
    grid-template-rows: 1fr;
    grid-template-columns: var(--nav-width) 1fr;
    grid-template-areas: "nav content";
  }

  .app-nav {
    border-top: none;
    border-right: 2px solid var(--accent-gold-dark);
    overflow-x: hidden;
    overflow-y: auto;
    background-image:
      linear-gradient(90deg, rgba(184, 134, 11, 0.05) 0%, transparent 60%),
      linear-gradient(180deg, rgba(0, 0, 0, 0.15) 0%, transparent 20%);
  }

  .app-nav::before {
    top: 0;
    bottom: 0;
    left: auto;
    right: 0;
    width: 2px;
    height: 100%;
    background: linear-gradient(180deg, var(--accent-gold-light), var(--accent-gold), var(--accent-gold-dark), transparent);
  }

  .nav-list {
    flex-direction: column;
    justify-content: flex-start;
    height: auto;
    padding: var(--space-sm) 6px;
    gap: 2px;
  }

  .nav-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: var(--space-md);
    padding: var(--space-md) 4px var(--space-md);
    border-bottom: 1px solid rgba(184, 134, 11, 0.2);
    width: 100%;
    position: relative;
  }

  /* Ornamental flourish under header */
  .nav-header::after {
    content: '\2726';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.65rem;
    color: var(--accent-gold);
    background: var(--bg-dark);
    padding: 0 4px;
  }

  .nav-header-title {
    font-family: var(--font-display);
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--accent-gold-light);
    text-align: center;
    line-height: 1.25;
    letter-spacing: 0.03em;
    text-shadow: 0 1px 3px rgba(184, 134, 11, 0.2);
  }

  .nav-header-subtitle {
    font-size: 0.5rem;
    color: rgba(212, 165, 32, 0.45);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-top: 3px;
    font-family: var(--font-ui);
    text-align: center;
  }

  .nav-item {
    flex-direction: column;
    gap: 3px;
    width: 100%;
    padding: 10px 4px;
    font-size: 0.55rem;
    justify-content: center;
    align-items: center;
    border-radius: var(--radius-md);
    letter-spacing: 0.06em;
    text-align: center;
  }

  .nav-icon {
    width: 20px;
    height: 20px;
  }

  .nav-item.active::after {
    bottom: auto;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 50%;
    border-radius: 0 2px 2px 0;
  }

  .app-content {
    padding: var(--space-xl) var(--space-xl);
  }

  .page-title {
    font-size: 2.4rem;
  }
}

@media (min-width: 1024px) {
  .app-content {
    padding: var(--space-2xl) var(--space-2xl);
  }
}

/* ---- Visibility helpers ---- */
.desktop-only {
  display: none;
}

@media (min-width: 768px) {
  .desktop-only {
    display: block;
  }
  .mobile-only {
    display: none;
  }
}