/* ===== Left Sidebar Navigation ===== */

:root {
    --sidebar-width: 220px;
    --sidebar-collapsed-width: 64px;
    --sidebar-bg: linear-gradient(180deg, #1a2744 0%, #162036 100%);
    --sidebar-border: rgba(255, 255, 255, 0.06);
    --sidebar-link-color: rgba(255, 255, 255, 0.65);
    --sidebar-link-hover-bg: rgba(255, 255, 255, 0.08);
    --sidebar-link-active-bg: linear-gradient(135deg, rgba(102, 126, 234, 0.25) 0%, rgba(118, 75, 162, 0.25) 100%);
    --sidebar-transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Sidebar Container */
.left-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--sidebar-bg);
    z-index: 150;
    display: flex;
    flex-direction: column;
    transition: width var(--sidebar-transition);
    overflow: hidden;
    border-right: 1px solid var(--sidebar-border);
}

/* Sidebar Brand */
.sidebar-brand {
    padding: 14px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--sidebar-border);
    min-height: 53px;
    flex-shrink: 0;
}

.sidebar-logo {
    font-size: 20px;
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar-brand-text {
    font-size: 15px;
    font-weight: 700;
    color: #ffffff;
    white-space: nowrap;
    overflow: hidden;
    transition: opacity 0.2s ease;
}

/* Navigation Links */
.sidebar-nav {
    flex: 1;
    padding: 12px 8px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    overflow-y: auto;
    overflow-x: hidden;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: 8px;
    text-decoration: none;
    color: var(--sidebar-link-color);
    font-size: 13.5px;
    font-weight: 500;
    transition: all 0.2s ease;
    position: relative;
    white-space: nowrap;
    overflow: hidden;
}

.sidebar-link svg {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    transition: stroke 0.2s ease;
}

.sidebar-link:hover {
    background: var(--sidebar-link-hover-bg);
    color: #ffffff;
}

.sidebar-link:hover svg {
    stroke: #ffffff;
}

.sidebar-link.active {
    background: var(--sidebar-link-active-bg);
    color: #ffffff;
    box-shadow: inset 3px 0 0 #667eea;
}

.sidebar-link.active svg {
    stroke: #a5b4fc;
}

.sidebar-label {
    overflow: hidden;
    transition: opacity 0.2s ease;
}

/* Sidebar Footer */
.sidebar-footer {
    padding: 12px 8px;
    border-top: 1px solid var(--sidebar-border);
    flex-shrink: 0;
}

.sidebar-collapse-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 8px;
    background: rgba(255, 255, 255, 0.05);
    border: none;
    border-radius: 8px;
    color: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: all 0.2s ease;
}

.sidebar-collapse-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.8);
}

.sidebar-collapse-btn svg {
    transition: transform var(--sidebar-transition);
}

/* Collapsed State */
.left-sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
}

.left-sidebar.collapsed .sidebar-brand-text {
    opacity: 0;
}

.left-sidebar.collapsed .sidebar-label {
    opacity: 0;
}

.left-sidebar.collapsed .sidebar-collapse-btn svg {
    transform: rotate(180deg);
}

.left-sidebar.collapsed .sidebar-link {
    justify-content: center;
    padding: 10px;
}

.left-sidebar.collapsed .sidebar-brand {
    justify-content: center;
    padding: 14px 8px;
}

/* Tooltips for Collapsed Sidebar */
.left-sidebar.collapsed .sidebar-link::after {
    content: attr(data-tooltip);
    position: absolute;
    left: calc(100% + 12px);
    top: 50%;
    transform: translateY(-50%);
    background: #1f2937;
    color: white;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
    white-space: nowrap;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.15s ease;
}

.left-sidebar.collapsed .sidebar-link:hover::after {
    opacity: 1;
}

/* Body Adjustment for Sidebar */
body.has-sidebar {
    padding-left: var(--sidebar-width);
    transition: padding-left var(--sidebar-transition);
}

body.has-sidebar.sidebar-collapsed {
    padding-left: var(--sidebar-collapsed-width);
}

/* Fixed-position nav adjustment (home page uses position:fixed) */
body.has-fixed-nav.has-sidebar .top-nav {
    left: var(--sidebar-width);
    transition: left var(--sidebar-transition);
}

body.has-fixed-nav.has-sidebar.sidebar-collapsed .top-nav {
    left: var(--sidebar-collapsed-width);
}

/* Hide top-nav brand on desktop when sidebar is present */
@media (min-width: 769px) {
    body.has-sidebar .nav-brand {
        display: none;
    }
}

/* Mobile Nav Divider */
.mobile-nav-divider {
    height: 1px;
    background: var(--border-color, #e5e7eb);
    margin: 8px 0;
}

/* Desktop: ensure sidebar is visible */
@media (min-width: 769px) {
    .left-sidebar {
        display: flex;
    }
}

/* Mobile: hide sidebar, reset body padding */
@media (max-width: 768px) {
    .left-sidebar {
        display: none;
    }

    body.has-sidebar {
        padding-left: 0 !important;
    }

    body.has-sidebar.sidebar-collapsed {
        padding-left: 0 !important;
    }

    body.has-fixed-nav.has-sidebar .top-nav {
        left: 0 !important;
    }
}