/**
 * App Layout Component
 * Sidebar + Main Content layout structure
 * @version 1.0.0
 *
 * Layout zones:
 * - Sidebar: persistent navigation (left)
 * - Main content: routed view with optional top bar
 */

/* =========================================================================
   APP LAYOUT CONTAINER
   ========================================================================= */

.app-layout {
    display: flex;
    min-height: 100vh;
    background: var(--bg-primary);
}

/* =========================================================================
   MAIN CONTENT AREA
   ========================================================================= */

.app-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0; /* Prevent flex item overflow */
    /* Account for fixed sidebar */
    margin-left: var(--sidebar-width-expanded);
    transition: margin-left var(--sidebar-transition);
}

/* When sidebar is collapsed */
.app-sidebar.collapsed ~ .app-main,
.has-collapsed-sidebar .app-main {
    margin-left: var(--sidebar-width-collapsed);
}

/* =========================================================================
   MAIN HEADER (Top bar inside main content)
   ========================================================================= */

.app-main-header {
    position: sticky;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    padding: var(--space-4) var(--space-6);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    z-index: 50;
    min-height: var(--size-header-height);
    backdrop-filter: blur(10px);
}

.app-main-header-left {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    min-width: 0;
}

.app-main-header-right {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    flex-shrink: 0;
}

/* Page title */
.app-page-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.app-page-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin: 0;
}

/* Breadcrumb in main header */
.app-breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.app-breadcrumb-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--duration-fast) ease;
}

.app-breadcrumb-link:hover {
    color: var(--text-primary);
}

.app-breadcrumb-separator {
    color: var(--text-muted);
    font-size: var(--font-size-xs);
}

.app-breadcrumb-current {
    color: var(--text-primary);
    font-weight: var(--font-weight-medium);
}

/* =========================================================================
   MAIN CONTENT BODY
   ========================================================================= */

.app-content {
    flex: 1;
    padding: var(--space-6);
    overflow-y: auto;
}

/* Centered content container */
.app-content-centered {
    max-width: 600px;
    margin: 0 auto;
}

/* Wide content container */
.app-content-wide {
    max-width: 1200px;
    margin: 0 auto;
}

/* Full width content */
.app-content-full {
    max-width: none;
}

/* =========================================================================
   RESPONSIVE ADJUSTMENTS
   ========================================================================= */

/* Medium screens - collapsed sidebar */
@media (max-width: 1024px) and (min-width: 769px) {
    .app-main {
        margin-left: var(--sidebar-width-collapsed);
    }

    /* Expand main content margin on sidebar hover */
    .app-sidebar:hover ~ .app-main,
    .app-sidebar:focus-within ~ .app-main {
        margin-left: var(--sidebar-width-expanded);
    }
}

/* Mobile screens - no sidebar margin */
@media (max-width: 768px) {
    .app-main {
        margin-left: 0;
    }

    .app-main-header {
        padding: var(--space-3) var(--space-4);
    }

    .app-content {
        padding: var(--space-4);
    }

    .app-page-title {
        font-size: var(--font-size-lg);
    }

    /* Show mobile menu toggle */
    .app-main-header-left {
        gap: var(--space-2);
    }
}

/* =========================================================================
   BODY CLASS HELPERS
   ========================================================================= */

/* Remove default body margin/padding when using app layout */
body.has-sidebar {
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}

/* Hide the old page header when using sidebar layout */
body.has-sidebar .page-header {
    display: none;
}

/* =========================================================================
   ACTION BUTTONS IN HEADER
   ========================================================================= */

.app-header-action {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--duration-fast) ease;
    text-decoration: none;
    min-height: 36px;
}

.app-header-action:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.app-header-action:focus-visible {
    outline: 2px solid var(--color-border-focus);
    outline-offset: 2px;
}

.app-header-action--primary {
    background: var(--app-accent, var(--accent-color));
    color: white;
    border-color: var(--app-accent, var(--accent-color));
}

.app-header-action--primary:hover {
    background: var(--app-accent-dark, var(--accent-color));
    color: white;
}

/* Icon-only action button */
.app-header-action--icon {
    padding: var(--space-2);
    min-width: 36px;
}

.app-header-action-icon {
    width: 18px;
    height: 18px;
}

/* =========================================================================
   THEME TOGGLE IN HEADER
   ========================================================================= */

.app-theme-toggle {
    display: flex;
    align-items: center;
}

.app-theme-toggle button {
    background-color: rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(0, 0, 0, 0.2);
    border-radius: 20px;
    padding: 3px;
    cursor: pointer;
    display: flex;
    align-items: center;
    width: 56px;
    height: 28px;
    position: relative;
    transition: all 0.3s ease;
    overflow: hidden;
}

.app-theme-toggle button:hover {
    background-color: rgba(0, 0, 0, 0.15);
}

.app-theme-toggle button:focus-visible {
    outline: 2px solid var(--color-border-focus);
    outline-offset: 2px;
}

.app-theme-toggle .toggle-icon {
    font-family: "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji", system-ui, sans-serif;
    font-size: 14px;
    position: absolute;
    transition: all 0.3s ease;
    z-index: 2;
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.app-theme-toggle .ghibli-icon {
    left: 3px;
    opacity: 1;
    transform: scale(1.1);
}

.app-theme-toggle .real-icon {
    right: 3px;
    opacity: 0.5;
}

.app-theme-toggle .toggle-slider {
    width: 22px;
    height: 22px;
    background-color: #fff;
    border-radius: 50%;
    position: absolute;
    left: 3px;
    top: 3px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s cubic-bezier(0.68, -0.55, 0.27, 1.55);
    z-index: 1;
}

body.real-mode .app-theme-toggle .toggle-slider {
    transform: translateX(28px);
}

body.real-mode .app-theme-toggle .ghibli-icon {
    opacity: 0.5;
    transform: scale(1);
}

body.real-mode .app-theme-toggle .real-icon {
    opacity: 1;
    transform: scale(1.1);
}

/* =========================================================================
   EMPTY STATE
   ========================================================================= */

.app-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-12);
    text-align: center;
    color: var(--text-muted);
}

.app-empty-state-icon {
    font-size: 48px;
    margin-bottom: var(--space-4);
    opacity: 0.5;
}

.app-empty-state-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin: 0 0 var(--space-2);
}

.app-empty-state-description {
    font-size: var(--font-size-sm);
    margin: 0 0 var(--space-6);
    max-width: 300px;
}

/* =========================================================================
   REDUCED MOTION
   ========================================================================= */

@media (prefers-reduced-motion: reduce) {
    .app-main,
    .app-theme-toggle *,
    .app-header-action {
        transition-duration: 0.01ms !important;
    }
}