/* ═══════════════════════════════════════════════════════════
   KOVAT Navigation v2.0 — Professional Sidebar + Mobile Nav
   WS-2: Navigation Rebuild
   NOTE: Works alongside v19 responsive rules (900px breakpoint)
   ═══════════════════════════════════════════════════════════ */

/* ── SIDEBAR (Desktop ≥900px) ────────────────────────── */

@media (min-width: 901px) {
  .sidebar {
    width: 240px;
    min-width: 240px;
  }

  .nav button.active,
  .nav a.active {
    background: rgba(74,122,255,0.1);
    border-left: 3px solid var(--kovat-accent-blue);
    color: var(--kovat-accent-blue);
    font-weight: 600;
  }

  .nav button, .nav a {
    border-left: 3px solid transparent;
    border-radius: 0 var(--kovat-radius-sm) var(--kovat-radius-sm) 0;
  }

  .sidebar.collapsed {
    width: 64px;
    min-width: 64px;
  }
}

/* ── NAV BUTTONS (shared) ─────────────────────────────── */

.nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}

.nav button, .nav a {
  display: flex;
  align-items: center;
  gap: var(--kovat-space-sm);
  width: 100%;
  padding: 10px 12px;
  background: transparent;
  border: none;
  color: var(--kovat-text-secondary);
  font-size: var(--kovat-body);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--kovat-transition-fast);
  text-decoration: none;
  position: relative;
}

.nav button:hover, .nav a:hover {
  background: var(--kovat-surface-raised);
  color: var(--kovat-text-primary);
}

.nav button span, .nav a span {
  font-size: 20px;
  width: 28px;
  text-align: center;
  flex-shrink: 0;
}

.nav button b, .nav a b {
  flex: 1;
  text-align: left;
  font-weight: inherit;
}

.nav button em, .nav a em {
  font-style: normal;
  background: var(--kovat-accent-red);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  min-width: 18px;
  height: 18px;
  border-radius: var(--kovat-radius-pill);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 0 5px;
}
.nav button em.show, .nav a em.show { display: inline-flex; }

.nav a.admin-link { color: var(--kovat-accent-red); }
.nav a.admin-link:hover { background: rgba(239,68,68,0.1); }

/* ── COLLAPSED SIDEBAR (Desktop only) ─────────────────── */

@media (min-width: 901px) {
  .sidebar.collapsed .brand-main,
  .sidebar.collapsed .brand-ai,
  .sidebar.collapsed .nav button b,
  .sidebar.collapsed .nav a b,
  .sidebar.collapsed .nav button em,
  .sidebar.collapsed .nav a em,
  .sidebar.collapsed .storage-widget,
  .sidebar.collapsed .plan-widget,
  .sidebar.collapsed .logout { display: none !important; }

  .sidebar.collapsed .nav button,
  .sidebar.collapsed .nav a {
    justify-content: center;
    padding: 12px 0;
    border-left: none;
    border-radius: var(--kovat-radius-sm);
  }
  .sidebar.collapsed .nav button span,
  .sidebar.collapsed .nav a span { font-size: 22px; width: auto; }
  .sidebar.collapsed .nav button.active,
  .sidebar.collapsed .nav a.active {
    background: rgba(74,122,255,0.15);
    border: 1px solid var(--kovat-accent-blue);
  }
}

/* ── BRAND ────────────────────────────────────────────── */

.sidebar .brand {
  display: flex;
  align-items: center;
  gap: var(--kovat-space-sm);
  padding: var(--kovat-space-sm) var(--kovat-space-md);
}
.sidebar .brand .brand-main {
  font-size: 20px;
  font-weight: 700;
  color: var(--kovat-accent-blue);
  letter-spacing: -0.5px;
}
.sidebar .brand .brand-ai {
  font-size: 14px;
  font-weight: 500;
  color: var(--kovat-text-secondary);
  background: var(--kovat-surface-raised);
  padding: 2px 8px;
  border-radius: var(--kovat-radius-pill);
}

/* ── SIDEBAR FOOTER ───────────────────────────────────── */

.sidebar .storage-widget,
.sidebar .plan-widget {
  padding: var(--kovat-space-sm) var(--kovat-space-md);
  background: var(--kovat-surface-raised);
  border-radius: var(--kovat-radius-sm);
  font-size: var(--kovat-small);
}
.sidebar .plan-widget { cursor: pointer; }
.sidebar .plan-widget:hover { background: rgba(74,122,255,0.1); }
.sidebar .logout {
  display: block;
  text-align: center;
  padding: var(--kovat-space-sm);
  color: var(--kovat-text-disabled);
  text-decoration: none;
  font-size: var(--kovat-small);
}
.sidebar .logout:hover { color: var(--kovat-accent-red); }

/* ── MOBILE BOTTOM NAV (≤900px) ───────────────────────── */

.mobile-nav { display: none; }

@media (max-width: 900px) {
  .mobile-nav {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 64px;
    background: var(--kovat-surface);
    border-top: 1px solid var(--kovat-border);
    z-index: 100;
    padding: 0 var(--kovat-space-sm);
    justify-content: space-around;
    align-items: center;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
  }

  .mobile-nav button {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 6px 8px;
    background: transparent;
    border: none;
    border-top: 2px solid transparent;
    color: var(--kovat-text-secondary);
    font-size: 11px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--kovat-transition-fast);
    min-width: 56px;
    position: relative;
  }

  .mobile-nav button span { font-size: 22px; line-height: 1; }
  .mobile-nav button.active {
    border-top-color: var(--kovat-accent-blue);
    color: var(--kovat-accent-blue);
  }

  .mobile-nav button em {
    font-style: normal;
    position: absolute;
    top: 0;
    right: 4px;
    background: var(--kovat-accent-red);
    color: #fff;
    font-size: 10px;
    font-weight: 700;
    min-width: 16px;
    height: 16px;
    border-radius: var(--kovat-radius-pill);
    display: none;
    align-items: center;
    justify-content: center;
  }
  .mobile-nav button em.show { display: inline-flex; }

  .content { padding-bottom: 72px !important; }
}

/* ── TOP BAR ──────────────────────────────────────────── */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--kovat-space-md) var(--kovat-space-lg);
  background: var(--kovat-surface);
  border-bottom: 1px solid var(--kovat-border);
  position: sticky;
  top: 0;
  z-index: 50;
  min-height: 56px;
}
.topbar h1 {
  font-size: var(--kovat-h2);
  font-weight: 600;
  margin: 0;
}
#topActions {
  display: flex;
  gap: var(--kovat-space-sm);
  align-items: center;
}

@media (max-width: 900px) {
  .topbar { padding: var(--kovat-space-sm) var(--kovat-space-md); min-height: 48px; }
  .topbar h1 { font-size: var(--kovat-h3); }
  #topActions { gap: 4px; }
  #topActions button { padding: 6px 12px; font-size: var(--kovat-small); }
}