* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #FF6B35 0%, #E55A2B 25%, #2196F3 50%, #1976D2 75%, #1565C0 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    background: rgba(255, 255, 255, 0.95);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    text-align: center;
    max-width: 500px;
    width: 100%;
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.logo {
    margin-bottom: 30px;
}

.logo i {
    font-size: 4rem;
    color: #FF6B35;
    margin-bottom: 15px;
    display: block;
}

.logo h1 {
    color: #2d3748;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.logo p {
    color: #718096;
    font-size: 1.1rem;
    margin-bottom: 20px;
}

.subtitle {
    color: #4a5568;
    font-size: 1.2rem;
    margin-bottom: 40px;
    font-weight: 500;
}

.selection-buttons {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 30px;
}

.user-type-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 20px 30px;
    border-radius: 15px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.user-type-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.user-type-btn:hover::before {
    left: 100%;
}

.user-type-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.user-type-btn i {
    font-size: 1.5rem;
}

.professor-btn {
    background: linear-gradient(135deg, #2196F3 0%, #1976D2 50%, #1565C0 100%);
}

.aluno-btn {
    background: linear-gradient(135deg, #FF6B35 0%, #E55A2B 50%, #2C3E50 100%);
}

.features {
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid #e2e8f0;
}

.features h3 {
    color: #2d3748;
    font-size: 1.1rem;
    margin-bottom: 20px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 15px;
}

.feature-item {
    background: #f7fafc;
    padding: 15px;
    border-radius: 10px;
    text-align: center;
}

.feature-item i {
    color: #2196F3;
    font-size: 1.5rem;
    margin-bottom: 8px;
    display: block;
}

.feature-item span {
    color: #4a5568;
    font-size: 0.9rem;
    font-weight: 500;
}

.footer {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #e2e8f0;
    color: #718096;
    font-size: 0.9rem;
}

.back-to-site {
    position: absolute;
    top: 20px;
    left: 20px;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    padding: 10px 20px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

.back-to-site:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    .container {
        padding: 25px 20px;
        margin: 5px;
        border-radius: 15px;
        max-width: 100%;
    }

    .logo h1 {
        font-size: 1.8rem;
    }

    .logo i {
        font-size: 3rem;
    }

    .logo p {
        font-size: 1rem;
    }

    .subtitle {
        font-size: 1.1rem;
        margin-bottom: 30px;
    }

    .user-type-btn {
        padding: 16px 20px;
        font-size: 1.1rem;
        border-radius: 12px;
    }

    .user-type-btn i {
        font-size: 1.3rem;
    }

    .features {
        margin-top: 30px;
        padding-top: 25px;
    }

    .features h3 {
        font-size: 1rem;
        margin-bottom: 15px;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .feature-item {
        padding: 12px;
        border-radius: 8px;
    }

    .feature-item i {
        font-size: 1.3rem;
        margin-bottom: 6px;
    }

    .feature-item span {
        font-size: 0.85rem;
    }

    .back-to-site {
        position: static;
        margin-bottom: 15px;
        display: inline-block;
        padding: 8px 16px;
        font-size: 0.9rem;
        border-radius: 20px;
    }

    .footer {
        margin-top: 25px;
        padding-top: 15px;
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    body {
        padding: 5px;
    }

    .container {
        padding: 20px 15px;
        margin: 0;
        border-radius: 12px;
        min-height: calc(100vh - 10px);
        display: flex;
        flex-direction: column;
        justify-content: center;
    }

    .logo h1 {
        font-size: 1.6rem;
        margin-bottom: 8px;
    }

    .logo i {
        font-size: 2.5rem;
        margin-bottom: 12px;
    }

    .logo p {
        font-size: 0.95rem;
        margin-bottom: 15px;
    }

    .subtitle {
        font-size: 1rem;
        margin-bottom: 25px;
    }

    .selection-buttons {
        gap: 15px;
        margin-bottom: 25px;
    }

    .user-type-btn {
        padding: 14px 18px;
        font-size: 1rem;
        border-radius: 10px;
        gap: 12px;
    }

    .user-type-btn i {
        font-size: 1.2rem;
    }

    .features {
        margin-top: 25px;
        padding-top: 20px;
    }

    .features h3 {
        font-size: 0.95rem;
        margin-bottom: 12px;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .feature-item {
        padding: 10px 8px;
        border-radius: 6px;
    }

    .feature-item i {
        font-size: 1.2rem;
        margin-bottom: 5px;
    }

    .feature-item span {
        font-size: 0.8rem;
        line-height: 1.2;
    }

    .footer {
        margin-top: 20px;
        padding-top: 12px;
        font-size: 0.8rem;
    }

    .back-to-site {
        padding: 6px 12px;
        font-size: 0.85rem;
        margin-bottom: 10px;
    }
}

/* Animação de loading */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid #FF6B35;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Efeito ripple */
.ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: scale(0);
    animation: ripple 0.6s linear;
    pointer-events: none;
}

@keyframes ripple {
    to {
        transform: scale(2);
        opacity: 0;
    }
}