/* ── SIDEBAR — Modern Premium Aesthetic ── */

:root {
    --sb-width: 280px;
    --sb-width-collapsed: 80px;
    --sb-bg: #ffffff;
    --sb-border: var(--border-light, rgba(0, 0, 0, 0.06));
    --sb-text: var(--text-header, #1e293b);
    --sb-text-dim: var(--text-muted, #64748b);
    --sb-accent: var(--primary, #6C63FF);
    --sb-accent-gradient: var(--grad-primary, linear-gradient(135deg, #6C63FF 0%, #00C9A7 100%));
    --sb-transition: var(--transition, all 0.3s cubic-bezier(0.16, 1, 0.3, 1));
    --sb-shadow: var(--shadow-md, 0 10px 30px rgba(0, 0, 0, 0.04));
}

[data-theme="dark"] .sidebar.chatgpt-style {
    --sb-bg: #0f172a;
    --sb-border: rgba(255, 255, 255, 0.1);
    --sb-text: #f8fafc;
    --sb-text-dim: #94a3b8;
}

.sidebar.chatgpt-style {
    width: var(--sb-width);
    background: var(--sb-bg);
    border-right: 1px solid var(--sb-border);
    height: 100vh;
    display: flex;
    flex-direction: column;
    color: var(--sb-text);
    transition: var(--sb-transition);
    flex-shrink: 0;
    overflow: hidden;
    position: relative;
    box-shadow: var(--sb-shadow);
    z-index: 1002;
}

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

.sidebar.hidden {
    width: 0;
    border-right: none;
    opacity: 0;
    transform: translateX(-100%);
}

/* Sidebar Top */
.sidebar-top {
    padding: 24px 20px 16px;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.sidebar.collapsed .sidebar-header {
    justify-content: center;
}

.sidebar-branding {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    transition: var(--sb-transition);
}

.sidebar.collapsed .brand-text {
    display: none;
}

.logo-box {
    width: 36px;
    height: 36px;
    background: var(--sb-accent-gradient);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.1rem;
    box-shadow: 0 4px 12px rgba(87, 192, 46, 0.3);
    flex-shrink: 0;
}

.brand-text b {
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--sb-text);
    letter-spacing: -0.02em;
}

.collapse-btn {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    border: 1px solid var(--sb-border);
    background: var(--sb-bg);
    color: var(--sb-text-dim);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--sb-transition);
}

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

.collapse-btn:hover {
    background: var(--primary-light);
    color: var(--primary);
}

/* New Chat Button */
.new-chat-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 100%;
    padding: 10px;
    background: rgba(87, 192, 46, 0.05);
    border: 1px solid rgba(87, 192, 46, 0.2);
    border-radius: 12px;
    color: var(--sb-text);
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--sb-transition);
}

[data-theme="dark"] .new-chat-btn {
    background: rgba(87, 192, 46, 0.1);
    border-color: rgba(87, 192, 46, 0.3);
    color: #f8fafc;
}

.sidebar.collapsed .new-chat-btn span {
    display: none;
}

.new-chat-btn:hover {
    background: var(--sb-accent-gradient);
    color: white;
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(87, 192, 46, 0.2);
}

/* Navigation */
.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 12px 14px;
}

.sidebar-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 10px 16px;
    margin-bottom: 4px;
    border-radius: 12px;
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--sb-text-dim);
    cursor: pointer;
    transition: var(--sb-transition);
    border: 1px solid transparent;
}

.sidebar.collapsed .nav-item {
    justify-content: center;
    padding: 14px 0;
}

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

.nav-item:hover {
    background: rgba(87, 192, 46, 0.08);
    color: var(--primary);
    transform: translateX(4px);
}

.sidebar.collapsed .nav-item:hover {
    transform: scale(1.1);
}

.nav-item i {
    width: 24px;
    text-align: center;
    font-size: 1.2rem;
    transition: var(--sb-transition);
    flex-shrink: 0;
}

.nav-item.active {
    background: var(--sb-accent-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(87, 192, 46, 0.2);
    border-color: rgba(255, 255, 255, 0.1);
}

.nav-item.active i {
    color: white;
}

.logout-item:hover {
    background: rgba(244, 63, 94, 0.08);
    color: #f43f5e;
}

.nav-divider {
    height: 1px;
    background: var(--sb-border);
    margin: 20px 0;
}

/* Footer / User Card */
.sidebar-footer {
    padding: 20px 14px;
    border-top: 1px solid var(--sb-border);
}

.sidebar-user-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border-radius: 16px;
    cursor: pointer;
    transition: var(--sb-transition);
    background: rgba(0, 0, 0, 0.02);
}

[data-theme="dark"] .sidebar-user-card {
    background: rgba(255, 255, 255, 0.05);
}

.sidebar-user-card:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
}

.sidebar.collapsed .sidebar-user-card {
    justify-content: center;
    padding: 12px 0;
}

.sidebar.collapsed .user-info {
    display: none;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    overflow: hidden;
    background: var(--sb-accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.user-name {
    font-size: 0.95rem;
    font-weight: 800;
    color: var(--sb-text);
}

.user-meta {
    font-size: 0.75rem;
    color: var(--sb-accent);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 2px;
}

.user-stats {
    display: flex;
    gap: 8px;
    margin-top: 4px;
}

.stat-item {
    font-size: 0.68rem;
    background: rgba(99, 102, 241, 0.1);
    color: var(--chat-accent);
    padding: 2px 6px;
    border-radius: 6px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 3px;
    white-space: nowrap;
}

[data-theme="dark"] .stat-item {
    background: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.8);
}

/* Scrollbar Style */
.sidebar-nav::-webkit-scrollbar {
    width: 4px;
}
.sidebar-nav::-webkit-scrollbar-track {
    background: transparent;
}
.sidebar-nav::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 10px;
}

[data-theme="dark"] .sidebar-nav::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .sidebar.chatgpt-style {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        box-shadow: 20px 0 50px rgba(0, 0, 0, 0.1);
    }
    
    .collapse-btn {
        display: none;
    }

    .mobile-close-btn {
        display: flex;
    }
}

.mobile-close-btn {
    display: none;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    border: 1px solid var(--sb-border);
    background: var(--sb-bg);
    color: var(--sb-text-dim);
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--sb-transition);
}

.mobile-close-btn:hover {
    background: var(--primary-light);
    color: var(--primary);
}

/* Always show a clear close affordance in drawer mode (ChatGPT-like). */
@media (max-width: 768px) {
    .sidebar.chatgpt-style .collapse-btn {
        display: none !important;
    }

    .sidebar.chatgpt-style .mobile-close-btn,
    .sidebar.chatgpt-style.open .mobile-close-btn,
    body.sidebar-open .sidebar.chatgpt-style .mobile-close-btn {
        display: flex !important;
    }

    .mobile-close-btn {
        width: 36px;
        height: 36px;
        border-radius: 10px;
        font-size: 14px;
        border-color: rgba(100, 116, 139, 0.35);
        background: rgba(248, 250, 252, 0.95);
        color: #334155;
        box-shadow: 0 6px 16px rgba(15, 23, 42, 0.12);
    }
}