:root {
            --primary: #4361ee;
            --primary-dark: #3a56d4;
            --secondary: #3f37c9;
            --accent: #4895ef;
            --success: #4cc9f0;
            --warning: #f72585;
            --dark: #212529;
            --light: #f8f9fa;
            --gray: #6c757d;
            --white: #ffffff;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background: linear-gradient(135deg, #0a1128, #001f54, #034078);
            background-attachment: fixed;
            color: var(--light);
            line-height: 1.6;
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
            position: relative;
            overflow-x: hidden;
        }
        
        .blur-background {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('https://images.hdqwalls.com/download/xbunutu-1i-1358x764.jpg') no-repeat center center;
            background-size: cover;
            filter: blur(8px);
            z-index: -1;
            opacity: 0.6;
        }
        
        .container {
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(10px);
            border-radius: 15px;
            padding: 30px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
            width: 100%;
            max-width: 900px;
            text-align: center;
            border: 1px solid rgba(255, 255, 255, 0.1);
            position: relative;
            display: none;
        }
        
        .container::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            border-radius: 15px 15px 0 0;
        }
        
        .logo {
            max-width: 200px;
            margin: 0 auto 30px;
            display: block;
            filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.5));
            animation: float 6s ease-in-out infinite;
        }
        
        @keyframes float {
            0% { transform: translateY(0px); }
            50% { transform: translateY(-10px); }
            100% { transform: translateY(0px); }
        }
        
        .btn-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }
        
        .btn {
            background: rgba(0, 0, 0, 0.3);
            backdrop-filter: blur(5px);
            color: var(--white);
            border: 1px solid rgba(255, 255, 255, 0.1);
            padding: 22px;
            border-radius: 12px;
            font-weight: 600;
            font-size: 1.1rem;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 15px;
            overflow: hidden;
            position: relative;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        }
        
        .btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            opacity: 0;
            transition: opacity 0.3s ease;
            z-index: -1;
        }
        
        .btn:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
            border-color: rgba(255, 255, 255, 0.3);
        }
        
        .btn:hover::before {
            opacity: 0.1;
        }
        
        .btn i {
            font-size: 2.5rem;
            margin-bottom: 10px;
            background: linear-gradient(135deg, var(--success), var(--primary));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            transition: all 0.3s ease;
        }
        
        .btn:hover i {
            transform: scale(1.1);
        }
        
        footer {
            margin-top: 40px;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.7);
        }
        
        footer a {
            color: var(--success);
            text-decoration: none;
            transition: color 0.3s ease;
        }
        
        footer a:hover {
            color: var(--accent);
            text-decoration: underline;
        }
        
        .password-form {
            background: rgba(0, 0, 0, 0.5);
            backdrop-filter: blur(15px);
            padding: 40px;
            border-radius: 15px;
            text-align: center;
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
            max-width: 400px;
            width: 90%;
            border: 1px solid rgba(255, 255, 255, 0.1);
            position: relative;
            overflow: hidden;
        }
        
        .password-form::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(90deg, var(--primary), var(--warning));
            border-radius: 15px 15px 0 0;
        }
        
        .password-form h2 {
            font-size: 1.8rem;
            margin-bottom: 10px;
            background: linear-gradient(90deg, var(--success), var(--primary));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        
        .password-form p {
            margin-bottom: 25px;
            color: var(--light);
            opacity: 0.8;
        }
        
        .password-form input {
            width: 100%;
            padding: 15px;
            margin-bottom: 20px;
            border-radius: 8px;
            border: 1px solid rgba(255, 255, 255, 0.2);
            background: rgba(0, 0, 0, 0.3);
            color: var(--white);
            font-size: 1rem;
            outline: none;
            transition: all 0.3s ease;
        }
        
        .password-form input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 2px rgba(67, 97, 238, 0.3);
        }
        
        .password-form button {
            width: 100%;
            padding: 15px;
            border-radius: 8px;
            border: none;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            color: var(--white);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        }
        
        .password-form button:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
        }
        
        #loader {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.8);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 9999;
            display: none;
        }
        
        .spinner {
            width: 70px;
            height: 70px;
            border: 6px solid transparent;
            border-top-color: var(--primary);
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }
        
        @keyframes spin {
            to { transform: rotate(360deg); }
        }
        
        /* Responsividade */
        @media (max-width: 768px) {
            .btn-container {
                grid-template-columns: 1fr;
            }
            
            .btn {
                padding: 16px;
            }
        }
        
        /* Efeitos de Particle */
        .particles {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
            overflow: hidden;
        }
        
        .particle {
            position: absolute;
            width: 5px;
            height: 5px;
            background: rgba(255, 255, 255, 0.5);
            border-radius: 50%;
            animation: float-particle 15s infinite linear;
        }
        
        @keyframes float-particle {
            0% { transform: translateY(0) translateX(0); opacity: 0; }
            10% { opacity: 1; }
            90% { opacity: 1; }
            100% { transform: translateY(-100vh) translateX(100px); opacity: 0; }
        }
        
        /* Timer styles */
        .session-timer {
            position: absolute;
            top: 20px;
            right: 20px;
            background: rgba(0, 0, 0, 0.5);
            padding: 8px 15px;
            border-radius: 5px;
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 8px;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        
        .session-timer i {
            color: var(--success);
        }
        
        .logout-btn {
            position: absolute;
            top: 20px;
            left: 20px;
            background: rgba(0, 0, 0, 0.3);
            color: var(--light);
            border: 1px solid rgba(255, 255, 255, 0.1);
            padding: 8px 15px;
            border-radius: 5px;
            font-size: 0.9rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 8px;
            transition: all 0.3s ease;
        }
        
        .logout-btn:hover {
            background: rgba(247, 37, 133, 0.2);
            border-color: var(--warning);
        }
        
        .logout-btn i {
            color: var(--warning);
        }