/* ============================================
   Layout Components
   ============================================ */

/* App Layout */
.app-layout {
    display: flex;
    min-height: 100vh;
}

.app-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: margin-left var(--transition-base);
}

.app-content {
    flex: 1;
    padding: var(--spacing-xl);
    max-width: var(--content-max-width);
    width: 100%;
    margin: 0 auto;
}

/* ============================================
   Header
   ============================================ */
.app-header {
    height: var(--header-height);
    background: var(--color-white);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-xl);
    position: sticky;
    top: 0;
    z-index: 40;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.header-search {
    position: relative;
}

.header-search input {
    width: 280px;
    padding: var(--spacing-sm) var(--spacing-md);
    padding-left: 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    background: var(--color-gray-50);
    transition: all var(--transition-fast);
}

.header-search input:focus {
    outline: none;
    border-color: var(--color-primary);
    background: var(--color-white);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.header-search .search-icon {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-gray-400);
    width: 18px;
    height: 18px;
}

/* Notifications */
.notification-btn {
    position: relative;
    background: none;
    border: none;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    color: var(--color-gray-500);
    transition: all var(--transition-fast);
}

.notification-btn:hover {
    background: var(--color-gray-100);
    color: var(--color-gray-700);
}

.notification-badge {
    position: absolute;
    top: 2px;
    right: 2px;
    width: 18px;
    height: 18px;
    background: var(--color-danger);
    color: var(--color-white);
    font-size: 11px;
    font-weight: 600;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* User Menu */
.user-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.user-menu:hover {
    background: var(--color-gray-100);
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--color-primary-light);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: var(--text-sm);
}

.user-info {
    display: flex;
    flex-direction: column;
}

.user-name {
    font-weight: 500;
    font-size: var(--text-sm);
    color: var(--color-gray-800);
}

.user-role {
    font-size: var(--text-xs);
    color: var(--color-gray-500);
}

/* ============================================
   Sidebar
   ============================================ */
.sidebar {
    width: var(--sidebar-width);
    background: var(--color-gray-900);
    color: var(--color-white);
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 50;
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-base);
    overflow-y: auto;
}

.sidebar-header {
    padding: var(--spacing-lg) var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.sidebar-logo {
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--color-white);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.sidebar-logo svg {
    width: 28px;
    height: 28px;
    color: var(--color-primary);
}

.sidebar-nav {
    flex: 1;
    padding: var(--spacing-md) 0;
}

.nav-section {
    margin-bottom: var(--spacing-md);
}

.nav-section-title {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-gray-400);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    color: var(--color-gray-300);
    font-size: var(--text-sm);
    font-weight: 400;
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--color-white);
}

.nav-item.active {
    background: rgba(37, 99, 235, 0.15);
    color: var(--color-white);
    border-left-color: var(--color-primary);
    font-weight: 500;
}

.nav-item svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

/* Sidebar Quota Widget */
.sidebar-quota {
    padding: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: auto;
}

.quota-mini {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.quota-mini-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: var(--text-xs);
    color: var(--color-gray-400);
}

.quota-mini-bar {
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
    margin-top: 2px;
}

.quota-mini-fill {
    height: 100%;
    border-radius: 2px;
    transition: width var(--transition-slow);
}

.quota-mini-fill.success { background: var(--color-success); }
.quota-mini-fill.warning { background: var(--color-warning); }
.quota-mini-fill.danger { background: var(--color-danger); }

/* ============================================
   Cards
   ============================================ */
.card {
    background: var(--color-white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
}

.card-header {
    padding: var(--spacing-lg) var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-title {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-gray-900);
}

.card-body {
    padding: var(--spacing-xl);
}

.card-footer {
    padding: var(--spacing-lg) var(--spacing-xl);
    border-top: 1px solid var(--border-color);
    background: var(--color-gray-50);
    border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg);
}

/* ============================================
   Stat Cards
   ============================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-lg);
}

.stat-card {
    background: var(--color-white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    transition: box-shadow var(--transition-fast);
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.stat-icon svg {
    width: 24px;
    height: 24px;
}

.stat-icon.primary { background: var(--color-primary-light); color: var(--color-primary); }
.stat-icon.success { background: var(--color-success-light); color: var(--color-success); }
.stat-icon.warning { background: var(--color-warning-light); color: var(--color-warning); }
.stat-icon.danger { background: var(--color-danger-light); color: var(--color-danger); }
.stat-icon.info { background: var(--color-info-light); color: var(--color-info); }

.stat-content {
    flex: 1;
}

.stat-value {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-gray-900);
    line-height: 1.2;
}

.stat-label {
    font-size: var(--text-sm);
    color: var(--color-gray-500);
    margin-top: var(--spacing-xs);
}

.stat-change {
    font-size: var(--text-xs);
    font-weight: 500;
    margin-top: var(--spacing-xs);
    display: inline-flex;
    align-items: center;
    gap: 2px;
}

.stat-change.up { color: var(--color-success); }
.stat-change.down { color: var(--color-danger); }