/* ============================================
   SKLAD-BUMAGA — Layout
   Sidebar + Header + Main content
   ============================================ */

/* ── App shell ─────────────────────────────── */
#app {
  display: flex;
  min-height: 100vh;
}

/* ── Sidebar ───────────────────────────────── */
#sidebar {
  width: var(--sidebar-width);
  background: var(--bg-sidebar);
  color: var(--text-inverse);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
  overflow-y: auto;
  overflow-x: hidden;
  transition: transform var(--duration-slow) var(--ease-out);
}

/* Subtle noise texture overlay */
#sidebar::after {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
}

#sidebar > * {
  position: relative;
  z-index: 1;
}

/* Sidebar header / logo */
.sidebar-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.sidebar-logo {
  font-family: var(--font-display);
  font-size: var(--font-size-lg);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: #fff;
}

.sidebar-logo-sub {
  font-size: var(--font-size-2xs);
  font-weight: 500;
  color: rgba(255, 255, 255, 0.35);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 2px;
}

/* Sidebar section label */
.sidebar-section {
  padding: 1.25rem 1.5rem 0.5rem;
  font-size: var(--font-size-2xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.25);
  font-family: var(--font-display);
}

/* Sidebar nav links */
.sidebar-nav {
  list-style: none;
  padding: 0.375rem 0;
  flex: 1;
}

.sidebar-nav li a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 1.5rem;
  margin: 1px 0.5rem;
  color: rgba(255, 255, 255, 0.55);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius);
  transition: all var(--duration) var(--ease-out);
  position: relative;
}

.sidebar-nav li a:hover {
  background: rgba(255, 255, 255, 0.07);
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
}

.sidebar-nav li a.active {
  background: rgba(37, 99, 235, 0.2);
  color: #fff;
  font-weight: 600;
}

.sidebar-nav li a.active::before {
  content: '';
  position: absolute;
  left: -0.5rem;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 20px;
  background: var(--primary-400);
  border-radius: 0 2px 2px 0;
}

.sidebar-nav li a svg {
  flex-shrink: 0;
  opacity: 0.5;
  transition: opacity var(--transition-fast);
}

.sidebar-nav li a:hover svg,
.sidebar-nav li a.active svg {
  opacity: 1;
}

/* Sidebar footer (admin links) */
.sidebar-footer {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 0.375rem 0 0.5rem;
}

.sidebar-admin-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 1.5rem;
  margin: 1px 0.5rem;
  color: rgba(255, 255, 255, 0.4);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius);
  transition: all var(--duration) var(--ease-out);
  position: relative;
}

.sidebar-admin-link:hover {
  background: rgba(255, 255, 255, 0.07);
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
}

.sidebar-admin-link.active {
  background: rgba(37, 99, 235, 0.2);
  color: #fff;
}

.sidebar-admin-link.active::before {
  content: '';
  position: absolute;
  left: -0.5rem;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 20px;
  background: var(--primary-400);
  border-radius: 0 2px 2px 0;
}

.sidebar-admin-link svg {
  flex-shrink: 0;
  opacity: 0.4;
  transition: opacity var(--transition-fast);
}

.sidebar-admin-link:hover svg,
.sidebar-admin-link.active svg {
  opacity: 0.9;
}

/* ── Main area ─────────────────────────────── */
#main {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--bg);
}

/* ── Header ────────────────────────────────── */
#header {
  height: var(--header-height);
  background: var(--bg-header);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 1.75rem;
  gap: 1rem;
  position: sticky;
  top: 0;
  z-index: 50;
}

/* Mobile sidebar toggle */
.sidebar-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  padding: 0.375rem;
  border-radius: var(--radius);
  transition: all var(--transition-fast);
}

.sidebar-toggle:hover {
  background: var(--slate-100);
  color: var(--text);
}

/* Header search */
.header-search {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--slate-50);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.4375rem 0.875rem;
  flex: 1;
  max-width: 420px;
  transition: all var(--transition);
}

.header-search:focus-within {
  border-color: var(--primary-300);
  background: var(--bg-card);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.08);
}

.header-search svg {
  color: var(--text-muted);
  flex-shrink: 0;
  transition: color var(--transition-fast);
}

.header-search:focus-within svg {
  color: var(--primary);
}

.header-search input {
  border: none;
  background: transparent;
  outline: none;
  width: 100%;
  font-size: var(--font-size-sm);
  font-family: var(--font);
  color: var(--text);
}

.header-search input::placeholder {
  color: var(--text-muted);
}

/* Header user info */
.header-user {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  margin-left: auto;
  font-size: var(--font-size-sm);
}

.theme-toggle {
  width: 2.25rem;
  height: 2.25rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  box-shadow: var(--shadow-xs);
  cursor: pointer;
  transition: transform var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
}

.theme-toggle:hover {
  color: var(--text);
  border-color: var(--primary-300);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.theme-toggle:focus-visible {
  outline: none;
  border-color: var(--primary-300);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.theme-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.theme-icon-moon {
  display: none;
}

.theme-toggle[data-theme="dark"] .theme-icon-sun {
  display: none;
}

.theme-toggle[data-theme="dark"] .theme-icon-moon {
  display: inline-flex;
}

#header-user-name {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.01em;
}

/* ── Content area ──────────────────────────── */
#content {
  flex: 1;
  padding: 1.75rem;
}

/* ── Mobile overlay for sidebar ────────────── */
.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  z-index: 99;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  animation: fade-in var(--duration) var(--ease-out);
}

@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ── Responsive ────────────────────────────── */
@media (max-width: 1024px) {
  #content {
    padding: 1.25rem;
  }
}

@media (max-width: 768px) {
  #sidebar {
    transform: translateX(-100%);
    box-shadow: var(--shadow-xl);
  }

  #sidebar.open {
    transform: translateX(0);
  }

  .sidebar-backdrop.active {
    display: block;
  }

  #main {
    margin-left: 0;
  }

  .sidebar-toggle {
    display: flex;
  }

  #header {
    padding: 0 1rem;
  }

  .header-search {
    max-width: 100%;
  }

  #content {
    padding: 1rem;
  }

  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .stat-grid {
    grid-template-columns: 1fr;
  }

  .header-user {
    gap: 0.375rem;
  }

  .theme-toggle {
    width: 2rem;
    height: 2rem;
  }

  #header-user-name {
    display: none;
  }
}