/* ============================================================
   FinSentinel — Sidebar Navigation
   ============================================================ */

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

.sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
}

/* Logo Section */
.sidebar__logo {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg) var(--space-lg);
    height: var(--topbar-height);
    border-bottom: 1px solid var(--border-subtle);
    flex-shrink: 0;
    overflow: hidden;
}

.sidebar__logo-icon {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar__logo-icon svg {
    width: 28px;
    height: 28px;
}

.sidebar__logo-text {
    display: flex;
    flex-direction: column;
    white-space: nowrap;
    overflow: hidden;
    transition: opacity var(--transition-base);
}

.sidebar.collapsed .sidebar__logo-text {
    opacity: 0;
    pointer-events: none;
}

.sidebar__brand {
    font-size: var(--text-lg);
    font-weight: 900;
    background: linear-gradient(135deg, #60a5fa, #818cf8, #34d399);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.sidebar__tagline {
    font-size: 0.55rem;
    color: var(--text-dim);
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

/* Navigation */
.sidebar__nav {
    flex: 1;
    padding: var(--space-lg) var(--space-sm);
    display: flex;
    flex-direction: column;
    gap: 2px;
    overflow-y: auto;
}

.sidebar__section-label {
    font-size: 0.55rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 700;
    padding: var(--space-lg) var(--space-sm) var(--space-sm) var(--space-md);
    white-space: nowrap;
    overflow: hidden;
    transition: opacity var(--transition-base);
}

.sidebar.collapsed .sidebar__section-label {
    opacity: 0;
    height: 0;
    padding: 0;
    overflow: hidden;
}

.sidebar__link {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: 8px 12px;
    border-radius: var(--radius-md);
    color: var(--text-muted);
    font-size: var(--text-sm);
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-fast);
    position: relative;
    white-space: nowrap;
    overflow: hidden;
}

.sidebar__link:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    text-decoration: none;
}

.sidebar__link.active {
    background: var(--color-blue-soft);
    color: var(--color-blue);
}

.sidebar__link.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 4px;
    bottom: 4px;
    width: 3px;
    border-radius: 0 2px 2px 0;
    background: var(--color-blue);
}

.sidebar__link-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar__link-icon svg {
    width: 18px;
    height: 18px;
    stroke-width: 1.8;
}

.sidebar__link-label {
    transition: opacity var(--transition-base);
}

.sidebar.collapsed .sidebar__link-label {
    opacity: 0;
    pointer-events: none;
}

/* Tooltip on collapsed state */
.sidebar.collapsed .sidebar__link {
    justify-content: center;
    padding: 10px;
}

.sidebar.collapsed .sidebar__link:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    left: calc(var(--sidebar-collapsed-width) + 8px);
    top: 50%;
    transform: translateY(-50%);
    background: var(--bg-card-solid);
    color: var(--text-primary);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-size: var(--text-xs);
    font-weight: 600;
    white-space: nowrap;
    z-index: 200;
    border: 1px solid var(--border-strong);
    box-shadow: var(--shadow-md);
    pointer-events: none;
}

/* Sidebar Footer */
.sidebar__footer {
    padding: var(--space-md) var(--space-sm);
    border-top: 1px solid var(--border-subtle);
    flex-shrink: 0;
}

.sidebar__toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    width: 100%;
    padding: 8px;
    border-radius: var(--radius-md);
    color: var(--text-dim);
    font-size: var(--text-xs);
    transition: all var(--transition-fast);
}

.sidebar__toggle:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
}

.sidebar__toggle svg {
    width: 18px;
    height: 18px;
    transition: transform var(--transition-base);
}

.sidebar.collapsed .sidebar__toggle svg {
    transform: rotate(180deg);
}

.sidebar__toggle-label {
    transition: opacity var(--transition-base);
}

.sidebar.collapsed .sidebar__toggle-label {
    opacity: 0;
    width: 0;
    overflow: hidden;
}

/* Badge count in nav */
.sidebar__badge {
    margin-left: auto;
    background: var(--color-red);
    color: #fff;
    font-size: 0.55rem;
    font-weight: 800;
    min-width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    padding: 0 5px;
    transition: opacity var(--transition-base);
}

.sidebar.collapsed .sidebar__badge {
    position: absolute;
    top: 2px;
    right: 6px;
    min-width: 14px;
    height: 14px;
    font-size: 0.5rem;
    padding: 0 3px;
    margin-left: 0;
}

/* --- MAIN CONTENT OFFSET --- */
.main-content {
    margin-left: var(--sidebar-width);
    transition: margin-left var(--transition-slow);
    min-height: 100vh;
}

.sidebar.collapsed ~ .main-content {
    margin-left: var(--sidebar-collapsed-width);
}