/* ===================================
   Layout Styles
   =================================== */

/* ===================================
   Main Layout
   =================================== */

.app-layout {
    display: flex;
    min-height: 100vh;
}

/* ===================================
   Sidebar
   =================================== */

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color-light);
    display: flex;
    flex-direction: column;
    z-index: var(--z-fixed);
    transition: transform var(--transition-normal), width var(--transition-normal);
}

.sidebar-header {
    display: flex;
    align-items: center;
    height: var(--header-height);
    padding: 0 var(--spacing-5);
    border-bottom: 1px solid var(--border-color-light);
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    min-width: 0;
}

.sidebar-logo-img {
    width: 40px;
    height: auto;
    flex-shrink: 0;
    object-fit: contain;
}

.sidebar-logo-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border-radius: var(--radius-lg);
    color: var(--text-inverse);
}

.sidebar-logo-text {
    font-family: var(--font-display);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-nav {
    flex: 1;
    padding: var(--spacing-4) var(--spacing-3);
    overflow-y: auto;
}

.nav-section {
    margin-bottom: var(--spacing-6);
}

.nav-section-title {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 0 var(--spacing-3);
    margin-bottom: var(--spacing-2);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-3) var(--spacing-3);
    margin-bottom: var(--spacing-1);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.nav-item:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.nav-item.active {
    background-color: var(--color-primary);
    color: var(--text-inverse);
}

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

.nav-item-badge {
    margin-left: auto;
    padding: var(--spacing-1) var(--spacing-2);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    background-color: var(--color-danger);
    color: var(--text-inverse);
    border-radius: var(--radius-full);
    min-width: 20px;
    text-align: center;
}

.nav-item.active .nav-item-badge {
    background-color: rgba(255, 255, 255, 0.3);
}

.sidebar-footer {
    padding: var(--spacing-4);
    border-top: 1px solid var(--border-color-light);
}

/* ===================================
   Main Content Area
   =================================== */

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

/* ===================================
   Header
   =================================== */

.header {
    position: sticky;
    top: 0;
    height: var(--header-height);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-6);
    z-index: var(--z-sticky);
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.menu-toggle {
    display: none;
    padding: var(--spacing-2);
    color: var(--text-secondary);
}

.header-title {
    font-family: var(--font-display);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.header-search {
    position: relative;
}

.header-search-input {
    width: 300px;
    padding: var(--spacing-2) var(--spacing-4);
    padding-left: var(--spacing-10);
    background-color: var(--bg-tertiary);
    border: 1px solid transparent;
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
}

.header-search-input:focus {
    background-color: var(--bg-secondary);
    border-color: var(--border-color);
    outline: none;
}

.header-search-icon {
    position: absolute;
    left: var(--spacing-4);
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    color: var(--text-tertiary);
}

.header-icon-btn {
    position: relative;
    padding: var(--spacing-2);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.header-icon-btn:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.header-icon-btn svg {
    width: 22px;
    height: 22px;
}

.notification-badge {
    position: absolute;
    top: 2px;
    right: 2px;
    width: 8px;
    height: 8px;
    background-color: var(--color-danger);
    border-radius: var(--radius-full);
}

.user-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-2) var(--spacing-3);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

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

.user-info {
    text-align: right;
}

.user-name {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
}

.user-email {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

/* ===================================
   Page Content
   =================================== */

.page-content {
    flex: 1;
    padding: var(--spacing-6);
    max-width: var(--content-max-width);
    width: 100%;
    margin: 0 auto;
}

.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-6);
}

.page-title {
    font-family: var(--font-display);
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.01em;
}

.page-description {
    color: var(--text-secondary);
    margin-top: var(--spacing-1);
}

/* Mail Detail Header */
.mail-detail-header {
    justify-content: space-between;
}

.mail-status-center {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.mail-status-label {
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    font-size: var(--font-size-base);
}

.mail-header-spacer {
    width: 100px;
}

/* ===================================
   Grid System
   =================================== */

.grid {
    display: grid;
    gap: var(--spacing-4);
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* ===================================
   Responsive Styles
   =================================== */

@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .grid-cols-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .header-search {
        display: none;
    }
}

@media (max-width: 768px) {
    .page-content {
        padding: var(--spacing-4);
    }
    
    .grid-cols-3,
    .grid-cols-2 {
        grid-template-columns: 1fr;
    }
    
    .header {
        padding: 0 var(--spacing-4);
    }
    
    .user-info {
        display: none;
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-4);
    }
}

/* ===================================
   Sidebar Overlay (Mobile)
   =================================== */

.sidebar-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: calc(var(--z-fixed) - 1);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
}