/* ═══════════════════════════════════════════════════════════
   Sidebar Navigation  –  nav.css
   Human Design Online App
   ═══════════════════════════════════════════════════════════ */

:root {
  --nav-width: 220px;
  --nav-bg:        #0f0f24;
  --nav-bg-brand:  #1a1a2e;
  --nav-accent:    #e49836;
  --nav-text:      rgba(255,255,255,0.82);
  --nav-text-dim:  rgba(255,255,255,0.38);
  --nav-hover:     rgba(255,255,255,0.07);
  --nav-active-bg: rgba(228,152,54,0.16);
  --nav-active-fg: #e49836;
  --nav-divider:   rgba(255,255,255,0.07);
}

/* ── Sidebar container ── */
.app-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--nav-width);
  height: 100vh;
  background: var(--nav-bg);
  color: var(--nav-text);
  display: flex;
  flex-direction: column;
  z-index: 1000;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.08) transparent;
  transition: transform 0.28s cubic-bezier(0.4,0,0.2,1),
              box-shadow 0.28s ease;
  flex-shrink: 0;
}

/* ── Brand / App Title ── */
.nav-brand {
  display: block;
  padding: 1.2rem 1rem 1.1rem;
  background: var(--nav-bg-brand);
  text-decoration: none;
  color: white;
  border-bottom: 1px solid var(--nav-divider);
  flex-shrink: 0;
}

.nav-brand-title {
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  line-height: 1.2;
}

.nav-brand-sub {
  font-size: 0.65rem;
  color: var(--nav-text-dim);
  margin-top: 0.2rem;
  letter-spacing: 0.04em;
}

/* ── Group ── */
.nav-group {
  padding: 0.6rem 0 0.3rem;
}

.nav-group-label {
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--nav-text-dim);
  padding: 0.15rem 1rem 0.4rem;
  user-select: none;
}

/* ── Nav links ── */
.nav-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 0.9rem 0.5rem 0.85rem;
  color: var(--nav-text);
  text-decoration: none;
  font-size: 0.84rem;
  line-height: 1.3;
  border-radius: 0 6px 6px 0;
  margin-right: 0.6rem;
  transition: background 0.14s, color 0.14s;
  cursor: pointer;
  border: none;
  background: none;
  width: calc(100% - 0.6rem);
  text-align: left;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-link:hover {
  background: var(--nav-hover);
  color: white;
}

.nav-link.active {
  background: var(--nav-active-bg);
  color: var(--nav-active-fg);
  font-weight: 600;
}

.nav-link-icon {
  width: 1.15rem;
  text-align: center;
  font-size: 0.85rem;
  flex-shrink: 0;
  opacity: 0.9;
}

/* ── Dividers between groups ── */
.nav-divider {
  height: 1px;
  background: var(--nav-divider);
  margin: 0.3rem 0.75rem;
}

/* ── Body shift on desktop ── */
body.has-sidebar {
  margin-left: var(--nav-width);
}

/* ── Mobile hamburger button ── */
.nav-hamburger {
  display: none;
  background: none;
  border: none;
  color: rgba(255,255,255,0.85);
  font-size: 1.3rem;
  cursor: pointer;
  padding: 0.25rem 0.6rem;
  line-height: 1;
  margin-right: 0.5rem;
  flex-shrink: 0;
  border-radius: 4px;
  transition: background 0.15s;
}

.nav-hamburger:hover {
  background: rgba(255,255,255,0.12);
}

/* ── Overlay behind sidebar on mobile ── */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  z-index: 999;
  backdrop-filter: blur(1px);
}

/* ── Fallback mobile bar (for pages without a <header>) ── */
.nav-mobile-bar {
  display: none;
  background: #1a1a2e;
  padding: 0.6rem 1rem;
  align-items: center;
}

/* ── Language button + dropdown ── */
.nav-lang-btn {
  margin-left: auto;
  background: none;
  border: none;
  font-size: 1.35rem;
  cursor: pointer;
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  line-height: 1;
  transition: background 0.15s;
  flex-shrink: 0;
  position: relative;
}
.nav-lang-btn:hover { background: rgba(255,255,255,0.12); }

.lang-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background: #1a1a2e;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 10px;
  padding: 0.5rem;
  z-index: 2000;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  width: 220px;
}
.lang-dropdown.open { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.25rem; }

.lang-option {
  background: none;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0.35rem 0.2rem;
  gap: 0.15rem;
  transition: background 0.14s;
}
.lang-option:hover   { background: rgba(255,255,255,0.1); }
.lang-option.active  { background: rgba(228,152,54,0.2); }
.lang-flag  { font-size: 1.4rem; line-height: 1; }
.lang-label { font-size: 0.55rem; color: rgba(255,255,255,0.6); white-space: nowrap; }
.lang-option.active .lang-label { color: #e49836; }

/* ── Sidebar language section ── */
.nav-lang-section {
  padding: 0.6rem 0.75rem 1rem;
  border-top: 1px solid var(--nav-divider);
  margin-top: auto;
}
.nav-lang-section-label {
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--nav-text-dim);
  padding: 0.15rem 0.25rem 0.5rem;
  user-select: none;
}
.nav-lang-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.25rem;
}

/* ── Uniform header title (all screen sizes) ── */
header.nav-header {
  display: flex;
  align-items: center;
  background: #1a1a2e;
  color: white;
  padding: 0.55rem 0.75rem;
  min-height: 52px;
  gap: 0.4rem;
}

.nav-header-title {
  flex: 1;
  font-size: 0.92rem;
  font-weight: 600;
  color: white;
  letter-spacing: 0.03em;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: center;
}

/* ── Mobile: sidebar hidden by default ── */
@media (max-width: 820px) {
  .nav-mobile-bar {
    display: flex;
  }
  .app-sidebar {
    transform: translateX(-100%);
    box-shadow: none;
  }

  .app-sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 24px rgba(0,0,0,0.4);
  }

  .sidebar-overlay.open {
    display: block;
  }

  body.has-sidebar {
    margin-left: 0;
    padding-top: 52px; /* room for fixed header */
  }

  .nav-hamburger {
    display: inline-flex;
    align-items: center;
  }

  /* Fixed header on mobile — overrides page CSS via class specificity */
  header.nav-header,
  .nav-mobile-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 500;
  }
}