/*
 * Layout CSS - Core layout structure
 * Header, Sidebar, Main Content, Footer
 * ============================================
 */

/* ============================================
   TOP HEADER
   ============================================ */

.top-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-default);
    z-index: 1001;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-5);
    box-shadow: var(--shadow-xs);
}

.header-brand-section {
    display: flex;
    align-items: center;
}

.header-brand-text {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    letter-spacing: -0.01em;
}

.header-brand-text i {
    color: var(--accent-primary);
    font-size: 1.25rem;
}

.header-user-section {
    display: flex;
    align-items: center;
}

.header-user-dropdown .dropdown-toggle {
    background: transparent;
    border: 1px solid var(--border-default);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.header-user-dropdown .dropdown-toggle:hover,
.header-user-dropdown .dropdown-toggle:focus {
    background-color: var(--bg-sunken);
    color: var(--text-primary);
    border-color: var(--border-strong);
    box-shadow: none;
}

.header-user-dropdown .dropdown-toggle::after {
    margin-left: var(--space-2);
}

/* ============================================
   LEFT SIDEBAR
   ============================================ */

.sidebar {
    position: fixed;
    top: 60px;
    left: 0;
    height: calc(100vh - 60px);
    width: 240px;
    background-color: var(--bg-surface);
    border-right: 1px solid var(--border-default);
    z-index: 1000;
    overflow-y: auto;
    overflow-x: hidden;
    transition: width var(--transition-slow), transform var(--transition-slow);
    display: flex;
    flex-direction: column;
}

/* Collapsed sidebar */
.sidebar.collapsed {
    width: 64px;
}

.sidebar.collapsed .sidebar-nav .nav-link {
    padding: var(--space-3);
    justify-content: center;
    margin-left: 0;
    margin-right: 0;
    border-radius: var(--radius-md);
}

.sidebar.collapsed .sidebar-nav .nav-link span {
    display: none;
}

.sidebar.collapsed .sidebar-nav .nav-link i {
    margin-right: 0;
}

.sidebar.collapsed .sidebar-theme-section {
    display: none;
}

.sidebar.collapsed .active-nav-link::before {
    display: none;
}

/* Tooltip for collapsed items */
.sidebar.collapsed .nav-link {
    position: relative;
}

.sidebar.collapsed .nav-link:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    left: 100%;
    top: 50%;
    transform: translateY(-50%);
    background: var(--bg-elevated);
    color: var(--text-primary);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    white-space: nowrap;
    z-index: 1001;
    margin-left: var(--space-2);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-default);
}

/* Sidebar Navigation */
.sidebar-nav {
    padding: var(--space-4) var(--space-3);
    margin: 0;
    list-style: none;
    flex: 1;
}

.sidebar-nav .nav-item {
    margin: var(--space-1) 0;
}

.sidebar-nav .nav-link {
    font-weight: 500;
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    color: var(--text-secondary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: 0.875rem;
    position: relative;
}

.sidebar-nav .nav-link:hover {
    background-color: var(--bg-sunken);
    color: var(--text-primary);
    text-decoration: none;
}

.sidebar-nav .nav-link i {
    width: 18px;
    font-size: 1rem;
    text-align: center;
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.sidebar-nav .nav-link:hover i {
    color: var(--accent-primary);
}

/* Active navigation link */
.sidebar-nav .active-nav-link {
    background-color: var(--accent-primary-subtle);
    color: var(--accent-primary);
    font-weight: 600;
}

.sidebar-nav .active-nav-link i {
    color: var(--accent-primary);
}

.sidebar-nav .active-nav-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: var(--space-2);
    bottom: var(--space-2);
    width: 3px;
    background-color: var(--accent-primary);
    border-radius: 0 2px 2px 0;
}

/* ============================================
   SIDEBAR THEME SECTION
   ============================================ */

.sidebar-theme-section {
    padding: var(--space-4);
    border-top: 1px solid var(--border-subtle);
    margin-top: auto;
}

.theme-section-header {
    margin-bottom: var(--space-3);
    text-align: center;
}

.theme-label {
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.theme-buttons-container {
    display: flex;
    justify-content: center;
    gap: var(--space-2);
}

.theme-buttons-container .theme-btn {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-default);
    background-color: var(--bg-sunken);
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    font-size: 0.875rem;
    cursor: pointer;
}

.theme-buttons-container .theme-btn:hover {
    background-color: var(--bg-elevated);
    color: var(--text-primary);
    border-color: var(--border-strong);
}

.theme-buttons-container .theme-btn.active {
    background-color: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
}

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

.main-wrapper {
    margin-left: 240px;
    margin-top: 60px;
    min-height: calc(100vh - 60px);
    transition: margin-left var(--transition-slow);
    background-color: var(--bg-base);
}

.main-wrapper.sidebar-collapsed {
    margin-left: 64px;
}

.main-content {
    padding: var(--space-5);
    min-height: calc(100vh - 120px);
}

.main-content h1:first-child,
.main-content h2:first-child {
    margin-top: 0;
    margin-bottom: var(--space-5);
}

/* ============================================
   SIDEBAR TOGGLE BUTTONS
   ============================================ */

.sidebar-toggle-desktop {
    position: fixed;
    top: 72px;
    left: 252px;
    z-index: 1002;
    background: var(--bg-surface);
    border: 1px solid var(--border-default);
    color: var(--text-muted);
    width: 24px;
    height: 24px;
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.sidebar-toggle-desktop:hover {
    background: var(--bg-sunken);
    color: var(--text-primary);
}

.sidebar-toggle-desktop.collapsed {
    left: 76px;
}

.sidebar-toggle-desktop i {
    font-size: 0.625rem;
    transition: transform var(--transition-fast);
}

.sidebar-toggle-desktop.collapsed i {
    transform: rotate(180deg);
}

/* Mobile toggle */
.sidebar-toggle {
    display: none;
    position: fixed;
    top: 72px;
    left: var(--space-4);
    z-index: 1002;
    background: var(--bg-surface);
    border: 1px solid var(--border-default);
    color: var(--text-secondary);
    padding: var(--space-2);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

/* Sidebar overlay (mobile) */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 999;
    backdrop-filter: blur(2px);
}

/* ============================================
   FOOTER
   ============================================ */

footer {
    padding: var(--space-4) 0;
    background-color: var(--bg-surface);
    color: var(--text-muted);
    margin-left: 240px;
    transition: margin-left var(--transition-slow);
    border-top: 1px solid var(--border-default);
    font-size: 0.8125rem;
}

footer.sidebar-collapsed {
    margin-left: 64px;
}

footer p {
    margin: 0;
}

/* ============================================
   AUTH PAGE STYLES
   ============================================ */

body.auth-page .sidebar {
    display: none;
}

body.auth-page .main-wrapper {
    margin-left: 0;
}

body.auth-page .top-header {
    position: relative;
}

body.auth-page .sidebar-toggle,
body.auth-page .sidebar-toggle-desktop {
    display: none;
}

body.auth-page footer {
    margin-left: 0;
}

/* ============================================
   MOBILE RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        width: 280px;
    }

    .sidebar.show {
        transform: translateX(0);
    }

    .main-wrapper,
    .main-wrapper.sidebar-collapsed {
        margin-left: 0;
    }

    footer,
    footer.sidebar-collapsed {
        margin-left: 0;
    }

    .sidebar-toggle {
        display: flex;
    }

    .sidebar-toggle-desktop {
        display: none;
    }

    .top-header {
        padding: 0 var(--space-4);
    }

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

    .sidebar-overlay.show {
        display: block;
    }

    /* Collapsed sidebar resets on mobile */
    .sidebar.collapsed {
        width: 280px;
    }
}

/* ============================================
   UTILITY CLASS FOR NO TRANSITIONS
   ============================================ */

.no-transition,
.no-transition * {
    transition: none !important;
}