@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');
        
        :root {
            --neu-bg: #e0e5ec;
            --neu-light: #ffffff;
            --neu-dark: #cbd5e0; 
            --accent: #4481eb;
            --text-primary: #31344b;
            --text-secondary: #7a8194;
        }

        body {
            font-family: 'Plus Jakarta Sans', sans-serif;
            background-color: var(--neu-bg);
            color: var(--text-primary);
            overflow-x: hidden;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* --- NEUMORPHIC SYSTEM --- */
        .neu-raised {
            background: var(--neu-bg);
            box-shadow: 6px 6px 12px var(--neu-dark), -6px -6px 12px var(--neu-light);
            border-radius: 24px;
        }

        .neu-inset {
            background: var(--neu-bg);
            box-shadow: inset 4px 4px 8px var(--neu-dark), inset -4px -4px 8px var(--neu-light);
            border-radius: 18px;
        }

        .neu-btn {
            background: var(--neu-bg);
            box-shadow: 4px 4px 8px var(--neu-dark), -4px -4px 8px var(--neu-light);
            border-radius: 16px;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            cursor: pointer;
            border: none;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .neu-btn:active {
            box-shadow: inset 2px 2px 4px var(--neu-dark), inset -2px -2px 4px var(--neu-light);
            transform: scale(0.98);
        }

        /* --- ANIMATIONS --- */
        .view-animate {
            animation: fadeIn 0.4s ease-out forwards;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(8px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .sidebar-link {
            transition: all 0.3s ease;
            margin: 6px 16px;
            padding: 12px 18px;
            border-radius: 16px;
            font-weight: 600;
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.8rem;
        }

        .sidebar-link.active {
            box-shadow: inset 4px 4px 8px var(--neu-dark), inset -4px -4px 8px var(--neu-light);
            color: var(--accent);
        }

        /* --- UI COMPONENTS --- */
        .msg-bubble { max-width: 85%; padding: 12px 16px; font-size: 0.8rem; margin-bottom: 8px; }
        .msg-me { align-self: flex-end; background: var(--neu-bg); box-shadow: 4px 4px 10px var(--neu-dark), -4px -4px 10px var(--neu-light); border-radius: 18px 18px 2px 18px; color: var(--accent); }
        .msg-others { align-self: flex-start; background: var(--neu-bg); box-shadow: inset 3px 3px 6px var(--neu-dark), inset -3px -3px 6px var(--neu-light); border-radius: 18px 18px 18px 2px; }

        .admin-tab-btn.active { box-shadow: inset 3px 3px 6px var(--neu-dark), inset -3px -3px 6px var(--neu-light); color: var(--accent); }
        
        #loader { position: fixed; inset: 0; background: var(--neu-bg); z-index: 9999; display: flex; align-items: center; justify-content: center; }
        .spin-slow { animation: rotate 10s linear infinite; }
        @keyframes rotate { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

        @media (max-width: 768px) {
            .sidebar-hidden { transform: translateX(-100%); }
            .main-content { margin-left: 0 !important; }
        }

        /* Fixed Footer at Bottom */
        .locked-footer {
            margin-top: auto;
            width: 100%;
            padding-bottom: 2rem;
        }

        /* Admin Login Notification Toast */
        #adminToast {
            position: fixed;
            bottom: 24px;
            right: 24px;
            z-index: 200;
            transition: all 0.5s ease;
            transform: translateX(150%);
        }
        #adminToast.show { transform: translateX(0); }