/* =========================================
   LAYOUT STYLES
   ========================================= */

body {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* ----- HEADER ----- */
.app-header {
    height: var(--header-height);
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-4);
    z-index: var(--z-fixed);
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    width: var(--sidebar-width);
}

.app-logo {
    width: 32px;
    height: 32px;
}

.app-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
}

.header-center {
    flex: 1;
    max-width: 600px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    width: var(--panel-width);
    justify-content: flex-end;
}

/* ----- MAIN CONTAINER ----- */
.app-main {
    display: flex;
    flex: 1;
    overflow: hidden;
    position: relative;
}

/* ----- SIDEBAR ----- */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--color-surface);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    z-index: var(--z-sticky);
    transition: width var(--transition-base);
}

.sidebar-header {
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-header h2 {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-semibold);
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-3);
}

.sidebar-footer {
    padding: var(--space-3);
    border-top: 1px solid var(--color-border-light);
}

/* ----- CANVAS AREA ----- */
.canvas-area {
    flex: 1;
    background-color: var(--color-background);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.canvas-toolbar {
    height: var(--toolbar-height);
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-4);
}

.toolbar-left,
.toolbar-right {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.divider {
    width: 1px;
    height: 24px;
    background-color: var(--color-border);
    margin: 0 var(--space-2);
}

.canvas-content {
    flex: 1;
    padding: var(--space-8);
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--color-text-tertiary);
    text-align: center;
    overflow-y: auto;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.canvas-content.drag-over {
    background-color: rgba(50, 184, 198, 0.05);
    outline: 2px dashed var(--color-primary);
    outline-offset: -4px;
}

/* Layout Modes for Badges */
.canvas-content.layout-horizontal {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    justify-content: flex-start;
    gap: var(--space-2);
    align-content: flex-start;
}

.canvas-content.layout-horizontal .badge-item {
    display: inline-flex;
}

.canvas-content.layout-vertical {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: var(--space-2);
}

.canvas-content.layout-vertical .badge-item {
    display: block;
    width: fit-content;
}

.empty-icon {
    margin-bottom: var(--space-4);
    opacity: 0.5;
}

/* ----- CUSTOMIZATION PANEL ----- */
.customization-panel {
    width: var(--panel-width);
    background-color: var(--color-surface);
    border-left: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    z-index: var(--z-sticky);
    transition: width var(--transition-base);
}

.panel-header {
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.panel-header h2 {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-semibold);
}

.panel-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-4);
}

.panel-empty-state {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--color-text-tertiary);
    font-style: italic;
}