/* ========================================
   Floating Glassmorphism Sidebar
   Kamelion - AI Brand Assistant
   ======================================== */

/* ========== SIDEBAR CONTAINER ========== */
.sidebar {
    position: fixed;
    left: var(--sidebar-margin, 20px);
    top: var(--sidebar-margin, 20px);
    height: calc(100vh - var(--sidebar-margin, 20px) * 2);
    width: var(--sidebar-width-collapsed, 72px);
    background: var(--sidebar-bg, rgba(12, 14, 18, 0.75));
    backdrop-filter: blur(40px);
    -webkit-backdrop-filter: blur(40px);
    border: 1px solid var(--sidebar-border, rgba(255, 255, 255, 0.08));
    border-radius: var(--sidebar-border-radius, 24px);
    display: flex !important;
    flex-direction: column;
    z-index: 100;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
    box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
    /* Ensure visibility */
    visibility: visible !important;
    opacity: 1 !important;
}

/* Expanded State */
.sidebar[data-expanded="true"] {
    width: var(--sidebar-width-expanded, 256px);
}

/* Inner glow effect */
.sidebar::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--sidebar-border-radius);
    padding: 1px;
    background: linear-gradient(
        180deg,
        rgba(255, 255, 255, 0.1) 0%,
        transparent 50%,
        transparent 100%
    );
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

/* ========== SIDEBAR HEADER (Logo + Toggle) ========== */
.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-2xl);
    min-height: 72px;
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    overflow: hidden;
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    background: linear-gradient(135deg, rgba(74, 222, 128, 0.2), rgba(74, 222, 128, 0.05));
    border-radius: var(--border-radius-lg);
}

.logo-icon svg {
    width: 22px;
    height: 22px;
    color: var(--color-active);
}

.logo-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    text-decoration: none;
    color: inherit;
}

.logo-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
    opacity: 0;
    transform: translateX(-10px);
    transition: opacity 0.2s ease, transform 0.2s ease;
    white-space: nowrap;
}

.sidebar[data-expanded="true"] .logo-text {
    opacity: 1;
    transform: translateX(0);
}

.logo-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    letter-spacing: var(--letter-spacing-tight);
    line-height: var(--line-height-none);
}

.logo-subtitle {
    font-size: 11px;
    font-weight: var(--font-weight-medium);
    color: var(--color-text-muted);
    letter-spacing: var(--letter-spacing-tight);
    line-height: var(--line-height-none);
}

/* ========== TOGGLE BUTTON ========== */
.sidebar-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-md);
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all var(--transition-base);
    flex-shrink: 0;
    opacity: 0;
    transform: scale(0.8);
}

.sidebar:hover .sidebar-toggle,
.sidebar[data-expanded="true"] .sidebar-toggle {
    opacity: 1;
    transform: scale(1);
}

.sidebar-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-text-primary);
    border-color: rgba(255, 255, 255, 0.2);
}

.sidebar-toggle svg {
    width: 18px;
    height: 18px;
    transition: transform 0.3s ease;
}

.sidebar[data-expanded="true"] .sidebar-toggle svg {
    transform: rotate(180deg);
}

/* ========== NAVIGATION ========== */
.sidebar-nav {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--spacing-md) var(--spacing-lg);
}

/* Scrollbar styling */
.sidebar-nav::-webkit-scrollbar {
    width: 4px;
}

.sidebar-nav::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar-nav::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
}

.sidebar-nav::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Navigation Sections */
.nav-section {
    margin-bottom: var(--spacing-4xl);
}

.nav-section-bottom {
    margin-top: auto;
    margin-bottom: 0;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* Sign Out Button Styling */
.nav-item-signout {
    color: var(--color-text-muted);
}

.nav-item-signout:hover {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

.nav-item-signout:hover svg {
    color: #ef4444;
}

.nav-label {
    display: block;
    font-size: 10px;
    font-weight: var(--font-weight-bold);
    color: var(--color-text-label);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
    padding: var(--spacing-md) var(--spacing-lg);
    opacity: 0;
    height: 0;
    overflow: hidden;
    transition: opacity 0.2s ease, height 0.2s ease;
}

.sidebar[data-expanded="true"] .nav-label {
    opacity: 1;
    height: auto;
    margin-bottom: var(--spacing-md);
}

/* Navigation Items */
.nav-items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    height: 44px;
    padding: 0 var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    letter-spacing: var(--letter-spacing-tight);
    text-decoration: none;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.nav-item svg {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
    transition: color var(--transition-base);
}

.nav-item span {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    opacity: 0;
    transform: translateX(-10px);
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.sidebar[data-expanded="true"] .nav-item span {
    opacity: 1;
    transform: translateX(0);
}

/* Hover State */
.nav-item:hover {
    background: rgba(255, 255, 255, 0.06);
    color: var(--color-text-primary);
}

/* ========== ACTIVE STATE WITH SHIMMER ========== */
.nav-item.active {
    background: rgba(74, 222, 128, 0.1);
    color: var(--color-active);
}

.nav-item.active svg {
    color: var(--color-active);
}

/* Shimmer border effect */
.nav-item.active::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--border-radius-lg);
    padding: 1px;
    background: linear-gradient(
        90deg,
        transparent 0%,
        var(--shimmer-highlight) 50%,
        transparent 100%
    );
    background-size: 200% 100%;
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    animation: shimmer var(--shimmer-speed) ease-in-out infinite;
}

@keyframes shimmer {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

/* Left accent bar for active item */
.nav-item.active::after {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 20px;
    background: var(--color-active);
    border-radius: 0 2px 2px 0;
}

/* ========== SESSION HISTORY (Collapsed view hides this) ========== */
.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md) 0;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
}

.sidebar[data-expanded="true"] .sidebar-content {
    opacity: 1;
    visibility: visible;
}

.session-group {
    margin-bottom: var(--spacing-md);
}

.session-group-header {
    padding: var(--spacing-xl) var(--spacing-2xl) var(--spacing-md);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-label);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
}

.session-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg) var(--spacing-2xl);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
}

.session-item:hover {
    background: var(--color-bg-hover);
}

.session-item.active {
    background: var(--color-active-bg);
}

.session-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 20px;
    background: var(--color-active);
    border-radius: 0 2px 2px 0;
}

.session-icon {
    font-size: 20px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.session-icon svg {
    width: 20px;
    height: 20px;
    color: var(--color-text-secondary);
}

.session-item.active .session-icon svg {
    color: var(--color-active);
}

.session-info {
    flex: 1;
    min-width: 0;
}

.session-title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    letter-spacing: var(--letter-spacing-tight);
}

.session-item.active .session-title {
    color: var(--color-active);
}

.session-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: 2px;
}

.session-mode {
    font-size: 11px;
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-muted);
    text-transform: capitalize;
}

.session-time {
    font-size: 11px;
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-muted);
}

/* Session Actions */
.session-actions {
    display: flex;
    gap: var(--spacing-xs);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.session-item:hover .session-actions {
    opacity: 1;
}

.session-action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: rgba(255, 255, 255, 0.05);
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    color: var(--color-text-muted);
    transition: all var(--transition-base);
}

.session-action-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-text-primary);
}

.session-action-btn.delete:hover {
    background: var(--color-error-bg);
    color: var(--color-error);
}

.session-action-btn svg {
    width: 14px;
    height: 14px;
}

/* ========== NEW SESSION BUTTON ========== */
.sidebar-new-session {
    padding: var(--spacing-2xl);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
}

.sidebar[data-expanded="true"] .sidebar-new-session {
    opacity: 1;
    visibility: visible;
}

.sidebar-new-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-xl) var(--spacing-2xl);
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(var(--blur-md));
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-full);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: all var(--transition-base);
}

.sidebar-new-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

.sidebar-new-btn svg {
    width: 18px;
    height: 18px;
}

/* ========== EMPTY STATE ========== */
.sidebar-empty {
    padding: var(--spacing-5xl) var(--spacing-2xl);
    text-align: center;
}

.sidebar-empty-icon {
    font-size: 40px;
    margin-bottom: var(--spacing-2xl);
    opacity: 0.4;
}

.sidebar-empty-icon svg {
    width: 40px;
    height: 40px;
    color: var(--color-text-muted);
}

.sidebar-empty-text {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-muted);
    line-height: var(--line-height-tight);
}

/* ========== SIDEBAR FOOTER ========== */
.sidebar-footer {
    padding: var(--spacing-2xl);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* ========== MOBILE MENU TOGGLE ========== */
.mobile-menu-toggle {
    display: none;
    position: fixed;
    left: var(--spacing-2xl);
    top: 50%;
    transform: translateY(-50%);
    width: 44px;
    height: 44px;
    background: var(--sidebar-bg);
    backdrop-filter: blur(40px);
    -webkit-backdrop-filter: blur(40px);
    border: 1px solid var(--sidebar-border);
    border-radius: var(--border-radius-lg);
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--color-text-primary);
    z-index: 50;
    transition: all var(--transition-base);
}

.mobile-menu-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--sidebar-border-hover);
}

.mobile-menu-toggle svg {
    width: 24px;
    height: 24px;
}

/* ========== RESPONSIVE DESIGN ========== */
@media (max-width: 1200px) {
    .sidebar {
        width: var(--sidebar-width-collapsed);
    }

    .sidebar[data-expanded="true"] {
        width: 240px;
    }
}

@media (max-width: 768px) {
    .sidebar {
        left: 0;
        top: 0;
        height: 100vh;
        width: 280px;
        border-radius: 0 var(--sidebar-border-radius) var(--sidebar-border-radius) 0;
        transform: translateX(-100%);
    }

    .sidebar[data-open="true"] {
        transform: translateX(0);
    }

    .sidebar[data-expanded="true"] {
        width: 280px;
    }

    /* Always show labels on mobile when open */
    .sidebar[data-open="true"] .logo-text,
    .sidebar[data-open="true"] .nav-item span,
    .sidebar[data-open="true"] .nav-label {
        opacity: 1;
        transform: translateX(0);
        height: auto;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    /* Overlay behind sidebar on mobile */
    .sidebar-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.6);
        backdrop-filter: blur(4px);
        z-index: 99;
    }

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

    /* Close button for mobile */
    .sidebar-close-btn {
        display: flex;
        position: absolute;
        top: var(--spacing-2xl);
        right: var(--spacing-2xl);
        width: 36px;
        height: 36px;
        align-items: center;
        justify-content: center;
        background: rgba(255, 255, 255, 0.05);
        border: 1px solid rgba(255, 255, 255, 0.1);
        border-radius: var(--border-radius-full);
        cursor: pointer;
        color: var(--color-text-muted);
        transition: all var(--transition-base);
    }

    .sidebar-close-btn:hover {
        background: rgba(255, 255, 255, 0.1);
        color: var(--color-text-primary);
    }

    .sidebar-close-btn svg {
        width: 18px;
        height: 18px;
    }
}

@media (min-width: 769px) {
    .sidebar-close-btn {
        display: none;
    }

    .sidebar-overlay {
        display: none !important;
    }
}

/* ========== ACCESSIBILITY ========== */
@media (prefers-reduced-motion: reduce) {
    .sidebar,
    .nav-item,
    .nav-item::before,
    .session-item,
    .session-actions,
    .sidebar-new-btn,
    .session-action-btn,
    .mobile-menu-toggle,
    .sidebar-close-btn,
    .sidebar-toggle,
    .logo-text,
    .nav-item span,
    .nav-label {
        transition: none !important;
        animation: none !important;
    }
}

/* Focus states */
.nav-item:focus-visible,
.session-item:focus-visible,
.sidebar-new-btn:focus-visible,
.session-action-btn:focus-visible,
.sidebar-toggle:focus-visible {
    outline: 2px solid var(--color-active);
    outline-offset: 2px;
}