/* MODERNES GRUND-DESIGN */
        body { 
            background-color: #020617; 
            background-image: radial-gradient(circle at 15% 50%, rgba(30, 41, 59, 0.4), transparent 50%), 
                              radial-gradient(circle at 85% 30%, rgba(8, 145, 178, 0.15), transparent 50%);
            background-attachment: fixed;
            color: #f8fafc; 
            font-family: 'Inter', 'Segoe UI', Roboto, sans-serif; 
            margin: 0; 
            overflow: hidden; 
        }

        .glass-panel { 
            background: rgba(15, 23, 42, 0.5); 
            backdrop-filter: blur(20px); 
            -webkit-backdrop-filter: blur(20px);
            border: 1px solid rgba(255, 255, 255, 0.05); 
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
        }

        .glow-effect { transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1); }
        .glow-effect:hover { 
            transform: translateY(-5px) scale(1.02); 
            box-shadow: 0 20px 40px -10px rgba(8, 145, 178, 0.4); 
            border-color: rgba(8, 145, 178, 0.3);
            background: rgba(30, 41, 59, 0.6);
        }

        .custom-scrollbar::-webkit-scrollbar { width: 4px; }
        .custom-scrollbar::-webkit-scrollbar-track { background: transparent; }
        .custom-scrollbar::-webkit-scrollbar-thumb { background: rgba(34, 211, 238, 0.3); border-radius: 10px; transition: background 0.3s; }
        .custom-scrollbar:hover::-webkit-scrollbar-thumb { background: rgba(34, 211, 238, 0.6); }

        .module-section { display: none; animation: fadeIn 0.5s cubic-bezier(0.4, 0, 0.2, 1); }
        .module-section.active { display: flex; flex-direction: column; height: 100%; }
        @keyframes fadeIn { from { opacity: 0; transform: translateY(15px); } to { opacity: 1; transform: translateY(0); } }

        .nav-btn-active { background: linear-gradient(90deg, rgba(8, 145, 178, 0.15) 0%, transparent 100%); border-left: 4px solid #06b6d4; color: #fff; }

        /* WETTER ANIMATIONEN FÜR DIE SIDEBAR */
        .weather-rain-drop { position: absolute; top: -20px; width: 1px; height: 18px; background: linear-gradient(to bottom, rgba(255,255,255,0), rgba(255,255,255,0.3)); transform: rotate(15deg); animation: rainFall linear infinite; }
        @keyframes rainFall { to { transform: translateY(250px) rotate(15deg); opacity: 0; } }
        .weather-snow-flake { position: absolute; top: -20px; width: 3px; height: 3px; background: rgba(255,255,255,0.6); border-radius: 50%; animation: snowFall linear infinite; }
        @keyframes snowFall { 0% { transform: translateY(0) translateX(0); opacity: 0; } 10% { opacity: 1; } 50% { transform: translateY(120px) translateX(15px); } 100% { transform: translateY(250px) translateX(-15px); opacity: 0; } }
        .weather-sun-rays { position: absolute; top: -50px; right: -50px; width: 250px; height: 250px; background: radial-gradient(circle, rgba(253, 224, 71, 0.15) 0%, transparent 60%); animation: pulseSun 6s infinite alternate ease-in-out; }
        @keyframes pulseSun { 0% { transform: scale(1); opacity: 0.6; } 100% { transform: scale(1.2); opacity: 1; } }
        .weather-lightning { position: absolute; inset: 0; background: rgba(255, 255, 255, 0.15); opacity: 0; animation: lightning 12s infinite; }
        @keyframes lightning { 0%, 94%, 100% { opacity: 0; } 95% { opacity: 1; } 96% { opacity: 0; } 97% { opacity: 0.5; } }

        /* KALENDER FARBEN RADIO BUTTONS */
        input[type="radio"].color-radio { display: none; }
        input[type="radio"].color-radio + label { width: 32px; height: 32px; border-radius: 50%; display: inline-block; cursor: pointer; border: 2px solid transparent; transition: all 0.2s; position: relative; }
        input[type="radio"].color-radio:checked + label { transform: scale(1.15); border-color: white; box-shadow: 0 0 10px rgba(255,255,255,0.3); }
        input[type="radio"].color-radio:checked + label::after { content: "\f00c"; font-family: "FontAwesome"; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); color: white; font-size: 12px; }