/**
 * ========================================
 * 04-layout.css
 * ========================================
 * Назначение: Общая структура страницы + sidebar
 * ========================================
 */

/* ========== Body Background ========== */
body {
  background: var(--bg-primary);
  min-height: 100vh;
  position: relative;
}

/* Subtle animated gradient background */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    135deg,
    var(--bg-primary) 0%,
    var(--bg-secondary) 40%,
    var(--bg-primary) 70%,
    rgba(37, 99, 235, 0.03) 100%
  );
  background-size: 200% 200%;
  animation: gradientShift 15s ease infinite;
  z-index: -1;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* ========== App Layout (sidebar + content) ========== */
.app-layout {
  display: flex;
  min-height: 100vh;
  padding-top: 70px;
}

/* ========== Sidebar ========== */
.sidebar {
  position: fixed;
  top: 70px;
  left: 0;
  width: var(--sidebar-width);
  height: calc(100vh - 70px);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border-right: 1px solid var(--glass-border);
  z-index: var(--z-sticky);
  transition: transform var(--transition-base), width var(--transition-base);
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
}

.sidebar__header {
  padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-md);
  border-bottom: 1px solid var(--glass-border);
}

.sidebar__label {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sidebar__nav {
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  flex: 1;
}

.sidebar__item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-md);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  border: 1px solid transparent;
  background: transparent;
  text-align: left;
  width: 100%;
  font-size: var(--text-sm);
  color: var(--text-secondary);
  font-weight: var(--font-medium);
  line-height: 1.4;
}

.sidebar__item:hover {
  background: rgba(37, 99, 235, 0.06);
  color: var(--primary-color);
  border-color: rgba(37, 99, 235, 0.1);
}

.sidebar__item--active {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(59, 130, 246, 0.08) 100%);
  color: var(--primary-color);
  border-color: rgba(37, 99, 235, 0.2);
  font-weight: var(--font-semibold);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.1);
}

.sidebar__item-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-lg);
  flex-shrink: 0;
  background: var(--bg-secondary);
  transition: all var(--transition-base);
}

.sidebar__item--active .sidebar__item-icon {
  background: var(--gradient-primary);
  color: white;
}

.sidebar__item-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar__item-title {
  font-size: var(--text-sm);
  font-weight: inherit;
  color: inherit;
}

.sidebar__item-desc {
  font-size: var(--text-xs);
  color: var(--text-muted);
  font-weight: var(--font-normal);
}

.sidebar__item--active .sidebar__item-desc {
  color: var(--secondary-color);
}

.sidebar__footer {
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: 1px solid var(--glass-border);
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-align: center;
}

/* ========== Content Area ========== */
.content-area {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-height: calc(100vh - 70px);
  transition: margin-left var(--transition-base);
}

/* ========== Container ========== */
.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  width: 100%;
}

.container-fluid {
  width: 100%;
  padding: 0 var(--spacing-lg);
}

/* ========== Main Content ========== */
.main {
  padding-top: var(--spacing-xl);
  padding-bottom: var(--spacing-3xl);
  min-height: calc(100vh - 70px);
}

/* ========== Flexbox утилиты ========== */
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-column { flex-direction: column; }
.flex-row { flex-direction: row; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }
.justify-end { justify-content: flex-end; }
.gap-xs { gap: var(--spacing-xs); }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

/* ========== Grid система ========== */
.grid { display: grid; }
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-cols-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

/* ========== Section Spacing ========== */
.section { padding: var(--spacing-3xl) 0; }
.section-sm { padding: var(--spacing-xl) 0; }
.section-lg { padding: var(--spacing-3xl) 0; }

/* ========== Card базовый стиль ========== */
.card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--glass-shadow);
}

/* ========== Responsive: mobile sidebar ========== */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    width: 280px;
  }
  .sidebar--open {
    transform: translateX(0);
  }
  .content-area {
    margin-left: 0;
  }
  .sidebar-toggle-mobile {
    display: flex;
  }
}

@media (min-width: 769px) {
  .sidebar-toggle-mobile {
    display: none;
  }
}