/* --------------------------------------------------
   LAYOUT.CSS — Structural layout for dashboard pages
   -------------------------------------------------- */

/* Wrapper */
body {
    display: flex;
    min-height: 100vh;
    overflow-x: hidden;
}

/* --------------------------------------------------
   SIDEBAR (single source of truth)
   -------------------------------------------------- */

.sidebar {
    width: 300px;
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
    padding: var(--space-4);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 150;
    transform: translateX(0);
    transition: transform 0.25s ease;
}

.sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    display: none;
    z-index: 100;
}

body.sidebar-open .sidebar-overlay {
    display: block;
}

/* MOBILE OVERRIDE */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-300px);
    }

    body.sidebar-open .sidebar {
        transform: translateX(0);
    }

    .main {
        margin-left: 0 !important;
    }
}

/* --------------------------------------------------
   SIDEBAR CONTENT
   -------------------------------------------------- */

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-weight: 600;
    font-size: 1.1rem;
}

.sidebar-nav-wrapper {
    flex: 1;
    overflow-y: auto;
    padding-right: 4px;
    border-top: 1px solid var(--color-border);
    padding-top: var(--space-3);
}

.sidebar-nav-wrapper::-webkit-scrollbar { width: 6px; }
.sidebar-nav-wrapper::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}
.sidebar-nav-wrapper::-webkit-scrollbar-thumb:hover {
    background: var(--color-bg-darker);
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.sidebar-nav a,
.sidebar-user-link {
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: 0.95rem;
    transition: var(--transition);
}

.sidebar-nav a:hover,
.sidebar-user-link:hover {
    background: var(--color-bg-darker);
    color: #fff;
}

.sidebar-divider {
    height: 1px;
    background: var(--color-border);
    margin: var(--space-3) 0;
    opacity: 0.6;
}

.sidebar-footer {
    margin-top: auto;
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-border);
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    display: flex;
    justify-content: space-between;
}

/* -----------------------------------------
   NAVIGATION LINKS
----------------------------------------- */

#sidebarNav a {
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    color: var(--color-text);
    display: block;
    transition: background 0.25s ease, color 0.25s ease;
    margin-top: var(--space-1);
    font-size: 0.95rem;
}

#sidebarNav a:hover {
    background: var(--color-bg);
}

#sidebarNav a.active {
    background: var(--color-bg);
    font-weight: 600;
}

/* -----------------------------------------
   NAV GROUPS
----------------------------------------- */

.nav-group {
    display: flex;
    flex-direction: column;
}

/* Group header */
.nav-group-header {
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    background: var(--color-bg);
    margin-top: var(--space-1);
    font-size: 0.95rem;
    color: var(--color-text);
    transition: background 0.25s ease, color 0.25s ease;
}

.nav-group-header:hover {
    background: var(--color-bg);
}

/* Arrow */
.nav-group-header::after {
    content: "›";
    font-size: 0.9rem;
    opacity: 0.6;
    margin-left: auto;
    transition:
        transform 0.45s cubic-bezier(0.32, 0.72, 0, 1),
        opacity 0.25s ease;
}

.nav-group.open .nav-group-header::after {
    transform: rotate(90deg);
    opacity: 1;
}

/* -----------------------------------------
   MATCHED SLIDE (UP & DOWN)
----------------------------------------- */

.nav-group-items {
    overflow: hidden;
    max-height: 0;
    opacity: 0;

    display: flex;
    flex-direction: column;

    margin-left: var(--space-2);
    padding-left: var(--space-2);

    /* SAME easing + SAME duration for both directions */
    transition:
        max-height 0.55s cubic-bezier(0.32, 0.72, 0, 1),
        opacity 0.55s cubic-bezier(0.32, 0.72, 0, 1);
}

/* When open */
.nav-group.open > .nav-group-items {
    max-height: 800px; /* enough for deep nesting */
    opacity: 1;
}

/* -----------------------------------------
   NESTED LINKS
----------------------------------------- */

.nav-group-items a {
    margin-top: var(--space-1);
    padding-top: var(--space-2);
    padding-bottom: var(--space-2);
    font-size: 0.9rem;
    transition: background 0.25s ease, color 0.25s ease;
}

.nav-group-items a.active {
    font-weight: 600;
    background: var(--color-bg);
}

/* --------------------------------------------------
   MAIN LAYOUT
   -------------------------------------------------- */

.main {
    margin-left: 300px;
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    position: relative;
    z-index: 1;
    max-width: 100%;
    overflow-x: hidden;
    overflow-y: auto;
    padding-top: 60px; /* space for fixed topbar */
}

.content-area {
    flex: 1;
    padding: var(--space-5);
    position: relative;
    z-index: 1;
}

/* --------------------------------------------------
   TOPBAR
   -------------------------------------------------- */

.topbar {
    height: 60px;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 1px 2px rgba(0,0,0,0.08);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-4);
    position: fixed;
    top: 0;
    left: 300px;
    right: 0;
    z-index: 999;
}

.topbar button {
    border: 0;
    background: transparent;
}

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

.topbar-right {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-left: auto;
}

.user-info {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.display-name { font-weight: 600; }

.subsystem {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    margin-top: -2px;
}

/* Mobile menu button */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    outline: none;
    padding: 6px;
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: var(--transition);
    font-size: 1.6rem;
    line-height: 1;
}

.mobile-menu-btn:hover {
    background: var(--color-border);
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
    }

    .user-info {
        max-width: calc(100vw - 215px);
    }

    .user-info .display-name,
    .user-info .subsystem {
        display: block;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        min-width: 0;
    }
}

/* --------------------------------------------------
   SEARCH BAR
   -------------------------------------------------- */

.search-bar {
    display: none;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-3) var(--space-4);
}

.search-bar.open {
    display: block;
    animation: searchBarSlideDown 0.25s ease;
}

@keyframes searchBarSlideDown {
    from { opacity: 0; transform: translateY(-6px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* --------------------------------------------------
   LOADING BAR
   -------------------------------------------------- */

#loading-bar {
    position: relative;
    height: 3px;
    width: 100%;
    background: transparent;
    overflow: hidden;
    opacity: 0;
    transition: opacity 0.2s ease;
}

#loading-bar.active { opacity: 1; }

#loading-bar::after {
    content: "";
    position: absolute;
    left: -40%;
    top: 0;
    height: 100%;
    width: 40%;
    background: var(--color-primary);
    animation: loadingBarAnim 1s infinite ease-in-out;
}

@keyframes loadingBarAnim {
    0%   { left: -40%; width: 40%; }
    50%  { left: 20%;  width: 60%; }
    100% { left: 100%; width: 40%; }
}

/* --------------------------------------------------
   MODULE FADE-IN
   -------------------------------------------------- */

.module-fade-in {
    animation: moduleFadeIn 0.25s ease;
}

@keyframes moduleFadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* --------------------------------------------------
   MOBILE
   -------------------------------------------------- */

@media (max-width: 768px) {
    .topbar {
        left: 0;
        right: 0;
        height: auto;
        padding: var(--space-2);
        gap: var(--space-2);
        flex-wrap: wrap;
    }

    .topbar-left { gap: var(--space-2); }

    .main {
        margin-left: 0 !important;
        padding-top: 60px;
    }

    .content-area { padding: var(--space-3); }
}